1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Packet filter rules are tested (see defines below). |
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5 | */ |
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6 | |
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7 | /* |
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8 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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9 | * |
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10 | * embedded brains GmbH |
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11 | * Dornierstr. 4 |
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12 | * 82178 Puchheim |
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13 | * Germany |
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14 | * <rtems@embedded-brains.de> |
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15 | * |
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16 | * Redistribution and use in source and binary forms, with or without |
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17 | * modification, are permitted provided that the following conditions |
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18 | * are met: |
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19 | * 1. Redistributions of source code must retain the above copyright |
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20 | * notice, this list of conditions and the following disclaimer. |
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21 | * 2. Redistributions in binary form must reproduce the above copyright |
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22 | * notice, this list of conditions and the following disclaimer in the |
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23 | * documentation and/or other materials provided with the distribution. |
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24 | * |
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25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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35 | * SUCH DAMAGE. |
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36 | */ |
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37 | |
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38 | #include <assert.h> |
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39 | #include <fcntl.h> |
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40 | #include <stdio.h> |
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41 | #include <stdlib.h> |
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42 | #include <string.h> |
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43 | #include <sys/stat.h> |
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44 | #include <sys/socket.h> |
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45 | #include <netinet/in.h> |
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46 | #include <netinet/tcp.h> |
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47 | #include <netdb.h> |
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48 | #include <unistd.h> |
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49 | #include <errno.h> |
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50 | |
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51 | #include <machine/rtems-bsd-commands.h> |
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52 | |
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53 | #include <rtems/libcsupport.h> |
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54 | #include <rtems/shell.h> |
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55 | #include <rtems/telnetd.h> |
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56 | #include <rtems/ftpd.h> |
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57 | |
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58 | #define TEST_NAME "LIBBSD PF 1" |
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59 | |
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60 | #define ARGC(x) RTEMS_BSD_ARGC(x) |
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61 | |
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62 | #define LO1_IP "172.21.1.1" |
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63 | #define LO2_IP "172.22.2.2" |
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64 | #define TELNET_PORT 23 |
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65 | #define FTP_PORT 21 |
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66 | |
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67 | #define SERVER_TASK_PRIO 110 |
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68 | |
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69 | /* |
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70 | * WARNING: The following rules are not made to be an good example for using PF. |
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71 | * Check the online manuals for PF to find out how to write good rules. |
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72 | */ |
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73 | |
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74 | /* Config with invalid syntax */ |
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75 | #define TEST_CFG_INVALID "/etc/pf_invalid.conf" |
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76 | #define TEST_CFG_INVALID_CONTENT \ |
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77 | "some\n" \ |
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78 | "garbage\n" |
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79 | |
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80 | /* Allow only some services on output. */ |
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81 | #define TEST_CFG_BLOCK_MOST "/etc/pf_block_most.conf" |
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82 | #define TEST_CFG_BLOCK_MOST_CONTENT \ |
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83 | "tcp_services = \"{ ssh, telnet, www }\"\n" \ |
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84 | "udp_services = \"{ telnet }\"\n" \ |
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85 | "block all\n" \ |
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86 | "pass out proto tcp to any port $tcp_services keep state\n" \ |
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87 | "pass proto udp to any port $udp_services keep state\n" |
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88 | |
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89 | /* Allow all on one and only some on another interface. */ |
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90 | #define TEST_CFG_IF_DEPEND "/etc/pf_if_depend.conf" |
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91 | #define TEST_CFG_IF_DEPEND_CONTENT \ |
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92 | "ext_if = \"cgem0\"\n" \ |
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93 | "int_if = \"lo0\"\n" \ |
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94 | "block in all\n" \ |
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95 | "pass in on $int_if all\n" \ |
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96 | "pass in on $ext_if inet proto { tcp, udp } from any port { telnet }\n" |
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97 | |
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98 | /* Block all input except on lo1. */ |
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99 | #define TEST_CFG_ALLOW_LO1 "/etc/pf_allow_lo1.conf" |
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100 | #define TEST_CFG_ALLOW_LO1_CONTENT \ |
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101 | "block all\n" \ |
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102 | "pass in on lo1 all keep state\n" \ |
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103 | "pass out all\n" |
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104 | |
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105 | /* Block all input except telnet on lo1. */ |
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106 | #define TEST_CFG_TELNET_LO1 "/etc/pf_allow_telnet_lo1.conf" |
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107 | #define TEST_CFG_TELNET_LO1_CONTENT \ |
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108 | "block all\n" \ |
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109 | "pass in on lo1 inet proto { tcp } from any to any port { telnet } keep state\n" \ |
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110 | "pass out all\n" |
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111 | |
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112 | /* pf.os */ |
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113 | #define ETC_PF_OS "/etc/pf.os" |
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114 | #define ETC_PF_OS_CONTENT "# empty" |
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115 | |
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116 | /* protocols */ |
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117 | #define ETC_PROTOCOLS "/etc/protocols" |
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118 | #define ETC_PROTOCOLS_CONTENT \ |
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119 | "ip 0 IP # internet protocol, pseudo protocol number\n" \ |
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120 | "tcp 6 TCP # transmission control protocol\n" \ |
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121 | "udp 17 UDP # user datagram protocol\n" |
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122 | |
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123 | /* services */ |
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124 | #define ETC_SERVICES "/etc/services" |
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125 | #define ETC_SERVICES_CONTENT \ |
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126 | "ftp-data 20/sctp #File Transfer [Default Data]\n" \ |
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127 | "ftp-data 20/tcp #File Transfer [Default Data]\n" \ |
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128 | "ftp-data 20/udp #File Transfer [Default Data]\n" \ |
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129 | "ftp 21/sctp #File Transfer [Control]\n" \ |
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130 | "ftp 21/tcp #File Transfer [Control]\n" \ |
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131 | "ftp 21/udp #File Transfer [Control]\n" \ |
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132 | "ssh 22/tcp #Secure Shell Login\n" \ |
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133 | "telnet 23/tcp\n" \ |
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134 | "telnet 23/udp\n" \ |
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135 | "http 80/tcp www www-http #World Wide Web HTTP\n" |
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136 | |
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137 | static const struct { |
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138 | const char *name; |
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139 | const char *content; |
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140 | } init_files[] = { |
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141 | {.name = ETC_PF_OS, .content = ETC_PF_OS_CONTENT}, |
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142 | {.name = ETC_PROTOCOLS, .content = ETC_PROTOCOLS_CONTENT}, |
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143 | {.name = ETC_SERVICES, .content = ETC_SERVICES_CONTENT}, |
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144 | {.name = TEST_CFG_INVALID, .content = TEST_CFG_INVALID_CONTENT}, |
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145 | {.name = TEST_CFG_BLOCK_MOST, .content = TEST_CFG_BLOCK_MOST_CONTENT}, |
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146 | {.name = TEST_CFG_IF_DEPEND, .content = TEST_CFG_IF_DEPEND_CONTENT}, |
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147 | {.name = TEST_CFG_ALLOW_LO1, .content = TEST_CFG_ALLOW_LO1_CONTENT}, |
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148 | {.name = TEST_CFG_TELNET_LO1, .content = TEST_CFG_TELNET_LO1_CONTENT}, |
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149 | }; |
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150 | |
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151 | /* Create all necessary files */ |
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152 | static void |
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153 | prepare_files() |
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154 | { |
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155 | size_t i; |
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156 | struct stat sb; |
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157 | int rv; |
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158 | int fd; |
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159 | size_t written; |
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160 | |
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161 | /* Create /etc if necessary */ |
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162 | rv = mkdir("/etc", S_IRWXU | S_IRWXG | S_IRWXO); |
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163 | /* ignore errors, check the dir after. */ |
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164 | assert(stat("/etc", &sb) == 0); |
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165 | assert(S_ISDIR(sb.st_mode)); |
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166 | |
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167 | /* Create files */ |
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168 | for(i = 0; i < (sizeof(init_files)/sizeof(init_files[0])); ++i) { |
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169 | const char *content; |
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170 | size_t len; |
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171 | |
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172 | content = init_files[i].content; |
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173 | len = strlen(content); |
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174 | |
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175 | fd = open(init_files[i].name, O_WRONLY | O_CREAT, |
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176 | S_IRWXU | S_IRWXG | S_IRWXO); |
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177 | assert(fd != -1); |
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178 | |
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179 | written = write(fd, content, len); |
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180 | assert(written == len); |
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181 | |
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182 | rv = close(fd); |
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183 | assert(rv == 0); |
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184 | } |
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185 | } |
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186 | |
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187 | /* Generic server task */ |
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188 | static rtems_task |
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189 | tcp_server_task(rtems_task_argument arg) |
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190 | { |
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191 | int sd, client; |
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192 | socklen_t addrlen; |
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193 | struct sockaddr_in addr, client_addr; |
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194 | uint16_t port = arg; |
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195 | int rv; |
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196 | const char answer[] = "I am a dummy\n"; |
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197 | |
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198 | sd = socket(AF_INET, SOCK_STREAM, 0); |
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199 | assert(sd > 0); |
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200 | |
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201 | memset(&addr, 0, sizeof addr); |
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202 | addr.sin_family = AF_INET; |
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203 | addr.sin_addr.s_addr = INADDR_ANY; |
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204 | addr.sin_port = htons(port); |
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205 | |
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206 | rv = bind(sd, (struct sockaddr *)&addr, sizeof(addr)); |
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207 | assert(rv == 0); |
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208 | |
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209 | rv = listen(sd, 10); |
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210 | assert(rv == 0); |
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211 | |
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212 | for(;;) { |
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213 | addrlen = sizeof(client_addr); |
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214 | client = accept(sd, (struct sockaddr *)&client_addr, &addrlen); |
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215 | if(client > 0) { |
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216 | write(client, answer, strlen(answer)); |
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217 | close(client); |
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218 | } |
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219 | } |
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220 | } |
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221 | |
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222 | static void |
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223 | spawn_server(uint16_t port) |
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224 | { |
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225 | rtems_status_code sc; |
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226 | rtems_id tid; |
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227 | |
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228 | sc = rtems_task_create(rtems_build_name('s','r','v',' '), |
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229 | SERVER_TASK_PRIO, |
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230 | RTEMS_MINIMUM_STACK_SIZE, |
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231 | RTEMS_DEFAULT_MODES, |
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232 | RTEMS_DEFAULT_ATTRIBUTES, |
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233 | &tid); |
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234 | assert(sc == RTEMS_SUCCESSFUL); |
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235 | sc = rtems_task_start(tid, tcp_server_task, port); |
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236 | assert(sc == RTEMS_SUCCESSFUL); |
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237 | } |
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238 | |
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239 | /* Start a few services to test */ |
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240 | static void |
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241 | prepare_services() |
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242 | { |
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243 | spawn_server(TELNET_PORT); |
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244 | spawn_server(FTP_PORT); |
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245 | } |
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246 | |
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247 | /* Create some additional loopback interfaces for the test. */ |
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248 | static void |
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249 | prepare_interfaces() |
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250 | { |
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251 | int exit_code; |
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252 | char *lo1[] = { |
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253 | "ifconfig", "lo1", "create", "inet", LO1_IP, |
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254 | "netmask", "255.255.0.0", NULL |
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255 | }; |
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256 | char *lo2[] = { |
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257 | "ifconfig", "lo2", "create", "inet", LO2_IP, |
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258 | "netmask", "255.255.0.0", NULL |
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259 | }; |
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260 | |
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261 | puts("--- create lo1 and lo2"); |
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262 | exit_code = rtems_bsd_command_ifconfig(ARGC(lo1), lo1); |
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263 | assert(exit_code == EXIT_SUCCESS); |
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264 | exit_code = rtems_bsd_command_ifconfig(ARGC(lo2), lo2); |
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265 | assert(exit_code == EXIT_SUCCESS); |
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266 | } |
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267 | |
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268 | static void |
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269 | check_tcp_port(char *host, bool expect_open, uint16_t port) |
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270 | { |
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271 | int sd; |
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272 | struct sockaddr_in addr; |
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273 | struct hostent *server; |
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274 | int rv; |
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275 | struct timeval tv; |
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276 | fd_set select_set; |
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277 | |
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278 | sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
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279 | assert(sd > 0); |
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280 | |
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281 | /* make socket nonblocking */ |
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282 | rv = fcntl(sd, F_GETFL, NULL); |
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283 | assert(rv >= 0); |
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284 | rv |= O_NONBLOCK; |
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285 | rv = fcntl(sd, F_SETFL, rv); |
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286 | assert(rv == 0); |
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287 | |
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288 | memset(&addr, 0, sizeof(addr)); |
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289 | addr.sin_family = AF_INET; |
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290 | addr.sin_port = htons(port); |
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291 | |
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292 | server = gethostbyname(host); |
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293 | assert(server != NULL); |
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294 | memcpy(&addr.sin_addr.s_addr, server->h_addr, server->h_length); |
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295 | |
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296 | rv = connect(sd, (struct sockaddr *)&addr, sizeof(addr)); |
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297 | if(rv == 0) { |
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298 | /* successfully connected */ |
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299 | assert(expect_open == true); |
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300 | } else { |
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301 | if(errno != EINPROGRESS) { |
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302 | assert(expect_open == false); |
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303 | } else { |
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304 | /* wait for connection or timeout */ |
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305 | memset(&tv, 0, sizeof(tv)); |
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306 | tv.tv_usec = 100000; |
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307 | |
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308 | FD_ZERO(&select_set); |
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309 | FD_SET(sd, &select_set); |
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310 | rv = select(sd+1, NULL, &select_set, NULL, &tv); |
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311 | |
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312 | /* rv < 0 would be an error |
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313 | * rv == 0 would be an timeout |
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314 | * rv > 0 would be success */ |
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315 | if(expect_open == false) { |
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316 | assert(rv == 0); |
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317 | } else { |
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318 | assert(rv > 0); |
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319 | } |
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320 | } |
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321 | } |
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322 | |
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323 | rv = close(sd); |
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324 | assert(rv == 0); |
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325 | } |
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326 | |
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327 | static void |
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328 | check_telnet(char *host, bool expect_open) |
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329 | { |
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330 | check_tcp_port(host, expect_open, TELNET_PORT); |
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331 | } |
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332 | |
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333 | static void |
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334 | check_ftp(char *host, bool expect_open) |
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335 | { |
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336 | check_tcp_port(host, expect_open, FTP_PORT); |
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337 | } |
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338 | |
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339 | /* Check if services work like expected */ |
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340 | static void |
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341 | check_services(char *host, bool exp_telnet, bool exp_ftp) |
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342 | { |
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343 | check_telnet(host, exp_telnet); |
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344 | check_ftp(host, exp_ftp); |
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345 | } |
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346 | |
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347 | static void |
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348 | disable_pf(bool ignore_not_enabled) |
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349 | { |
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350 | int exit_code; |
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351 | char *pfctl[] = {"pfctl", "-d", "-q", NULL}; |
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352 | |
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353 | exit_code = rtems_bsd_command_pfctl(ARGC(pfctl), pfctl); |
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354 | assert(ignore_not_enabled || (exit_code == EXIT_SUCCESS)); |
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355 | } |
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356 | |
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357 | static void |
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358 | enable_pf() |
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359 | { |
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360 | int exit_code; |
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361 | char *pfctl[] = {"pfctl", "-e", "-q", NULL}; |
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362 | |
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363 | exit_code = rtems_bsd_command_pfctl(ARGC(pfctl), pfctl); |
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364 | assert(exit_code == EXIT_SUCCESS); |
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365 | } |
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366 | |
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367 | /* Execute pfctl two times with the given arguments. Check the resources. */ |
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368 | static void |
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369 | run_pfctl(int argc, char *argv[], int expected_result) |
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370 | { |
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371 | int exit_code; |
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372 | rtems_resource_snapshot snapshot, snapshot2; |
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373 | |
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374 | exit_code = rtems_bsd_command_pfctl(argc, argv); |
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375 | assert(exit_code == expected_result); |
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376 | |
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377 | rtems_resource_snapshot_take(&snapshot); |
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378 | exit_code = rtems_bsd_command_pfctl(argc, argv); |
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379 | assert(exit_code == expected_result); |
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380 | rtems_resource_snapshot_take(&snapshot2); |
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381 | |
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382 | /* heap fragmentation might change so remove it from compare */ |
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383 | snapshot.workspace_info.Free.largest = 0; |
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384 | snapshot2.workspace_info.Free.largest = 0; |
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385 | snapshot.heap_info.Free.largest = 0; |
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386 | snapshot2.heap_info.Free.largest = 0; |
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387 | assert(exit_code == EXIT_SUCCESS || |
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388 | rtems_resource_snapshot_equal(&snapshot, &snapshot2)); |
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389 | } |
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390 | |
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391 | static void |
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392 | test_pfctl(void) |
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393 | { |
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394 | char *no_params[] = { |
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395 | "pfctl", |
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396 | NULL |
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397 | }; |
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398 | char *invalid[] = { |
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399 | "pfctl", |
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400 | "-f", |
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401 | TEST_CFG_INVALID, |
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402 | "-q", |
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403 | NULL |
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404 | }; |
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405 | char *block_most[] = { |
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406 | "pfctl", |
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407 | "-f", |
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408 | TEST_CFG_BLOCK_MOST, |
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409 | "-q", |
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410 | NULL |
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411 | }; |
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412 | char *if_depend[] = { |
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413 | "pfctl", |
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414 | "-f", |
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415 | TEST_CFG_IF_DEPEND, |
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416 | "-q", |
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417 | NULL |
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418 | }; |
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419 | |
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420 | puts("--- run pfctl with no paramters"); |
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421 | run_pfctl(ARGC(no_params), no_params, EXIT_FAILURE); |
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422 | |
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423 | puts("--- load invalid rule"); |
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424 | run_pfctl(ARGC(invalid), invalid, EXIT_FAILURE); |
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425 | |
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426 | puts("--- load rule to block input and most output"); |
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427 | run_pfctl(ARGC(block_most), block_most, EXIT_SUCCESS); |
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428 | |
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429 | puts("--- load rule to block if dependent"); |
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430 | run_pfctl(ARGC(if_depend), if_depend, EXIT_SUCCESS); |
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431 | } |
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432 | |
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433 | static void |
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434 | test_allow_lo1() |
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435 | { |
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436 | char *pfctl[] = { |
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437 | "pfctl", |
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438 | "-f", |
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439 | TEST_CFG_ALLOW_LO1, |
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440 | "-q", |
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441 | NULL |
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442 | }; |
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443 | |
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444 | disable_pf(true); |
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445 | |
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446 | puts("--- check services"); |
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447 | check_services(LO1_IP, true, true); |
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448 | check_services(LO2_IP, true, true); |
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449 | |
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450 | puts("--- load and enable rule to allow only lo1"); |
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451 | run_pfctl(ARGC(pfctl), pfctl, EXIT_SUCCESS); |
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452 | enable_pf(); |
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453 | |
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454 | puts("--- check services"); |
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455 | check_services(LO1_IP, true, true); |
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456 | check_services(LO2_IP, false, false); |
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457 | } |
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458 | |
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459 | static void |
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460 | test_telnet_lo1() |
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461 | { |
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462 | char *pfctl[] = { |
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463 | "pfctl", |
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464 | "-f", |
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465 | TEST_CFG_TELNET_LO1, |
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466 | "-q", |
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467 | NULL |
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468 | }; |
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469 | |
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470 | disable_pf(true); |
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471 | |
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472 | puts("--- check services"); |
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473 | check_services(LO1_IP, true, true); |
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474 | check_services(LO2_IP, true, true); |
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475 | |
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476 | puts("--- load and enable rule to allow telnet on lo1"); |
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477 | run_pfctl(ARGC(pfctl), pfctl, EXIT_SUCCESS); |
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478 | enable_pf(); |
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479 | |
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480 | puts("--- check services"); |
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481 | check_services(LO1_IP, true, false); |
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482 | check_services(LO2_IP, false, false); |
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483 | } |
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484 | |
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485 | static void |
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486 | test_main(void) |
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487 | { |
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488 | prepare_files(); |
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489 | prepare_interfaces(); |
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490 | prepare_services(); |
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491 | |
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492 | test_pfctl(); |
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493 | |
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494 | test_allow_lo1(); |
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495 | test_telnet_lo1(); |
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496 | |
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497 | exit(0); |
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498 | } |
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499 | |
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500 | #include <machine/rtems-bsd-sysinit.h> |
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501 | |
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502 | #define RTEMS_BSD_CONFIG_FIREWALL_PF |
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503 | |
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504 | #include <rtems/bsd/test/default-network-init.h> |
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