1 | #!/usr/bin/perl -w |
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2 | |
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3 | # Kevin Lahey, lahey@isi.edu |
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4 | # July 11, 2007 |
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5 | |
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6 | # Set up ssh tunnel infrastructure for federation: |
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7 | # |
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8 | # * Parse the configuration file provided. |
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9 | # |
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10 | # * Figure out whether we're the initiator or the reciever; if we're |
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11 | # the receiver, we just need to set up ssh keys and exit. |
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12 | # |
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13 | # * Pick out the experimental interface, remove the IP address |
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14 | # |
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15 | # * Create a layer 2 ssh tunnel, set up bridging, and hang loose. |
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16 | # |
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17 | |
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18 | use strict; |
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19 | use Getopt::Std; |
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20 | use POSIX qw(strftime); |
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21 | use Sys::Hostname; |
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22 | use IO::File; |
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23 | use IO::Pipe; |
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24 | use File::Copy; |
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25 | |
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26 | my $IFCONFIG = "/sbin/ifconfig"; |
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27 | my $TMCC = "/usr/local/etc/emulab/tmcc"; |
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28 | # If a special version of ssh is required, it will be installed in |
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29 | # /usr/local/bin/ssh. Otherwise use the usual one. |
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30 | my $SSH = -x "/usr/local/bin/ssh" ? "/usr/local/bin/ssh" : "/usr/bin/ssh"; |
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31 | my $NC = "/usr/bin/nc"; |
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32 | my $SSH_PORT = 22; |
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33 | my $ROUTE_GET = "/sbin/route get"; # XXX: works on FreeBSD, but should |
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34 | # should be 'ip route get' for Linux |
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35 | my $sshd_config = "/etc/ssh/sshd_config"; # Probably should be a param |
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36 | |
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37 | # Ports that are forwarded between testbeds |
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38 | my $TMCD_PORT = 7777; |
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39 | my $SMBFS_PORT = 139; |
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40 | my $PUBSUB_PORT = 16505; |
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41 | |
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42 | |
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43 | my $remote_pubsub_port = $PUBSUB_PORT - 1; # There will be a local |
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44 | # pubsubd running, so we |
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45 | # dodge the port on the |
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46 | # remote tunnel node. |
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47 | |
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48 | die "Cannot exec $SSH" unless -x $SSH; |
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49 | |
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50 | sub setup_bridging; |
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51 | sub setup_tunnel_cfg; |
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52 | sub parse_config; |
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53 | |
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54 | # Option use is as follows: |
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55 | # -f filename containing config file |
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56 | # -d turn on debugging output |
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57 | # -r remotely invoked |
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58 | # (if remotely invoked the last two args are the tun interface |
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59 | # number and the remote address of the tunnel) |
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60 | |
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61 | my $usage = "Usage: fed-tun.pl [-r] [-d] [-f config-filename] [count addr]\n"; |
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62 | |
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63 | my %opts; # Note that this is used for both getops and the options file |
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64 | my @expected_opts = qw(active tunnelcfg bossname fsname type |
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65 | peer pubkeys privkeys); |
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66 | my $filename; |
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67 | my $remote; |
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68 | my $debug = 1; |
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69 | my $count; |
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70 | my $addr; |
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71 | my $active; |
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72 | my $type; |
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73 | my $tunnelcfg; |
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74 | my $ssh_port_fwds = ""; |
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75 | my $remote_script_dir; # location of the other sides fed-tun.pl |
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76 | my $event_repeater; # The pathname of the event repeater |
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77 | my $remote_config_file; # Config file for the other side |
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78 | |
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79 | if ($#ARGV != 0 && !getopts('df:r', \%opts)) { |
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80 | die "$usage"; |
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81 | } |
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82 | |
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83 | if (defined($opts{'d'})) { |
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84 | $debug = 1; |
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85 | } |
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86 | |
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87 | if (defined($opts{'f'})) { |
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88 | $filename = $opts{'f'}; |
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89 | } |
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90 | |
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91 | if (defined($opts{'r'})) { |
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92 | $remote = 1; |
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93 | die "$usage" if ($#ARGV != 1); |
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94 | |
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95 | $count = pop @ARGV; |
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96 | $addr = pop @ARGV; |
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97 | } |
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98 | |
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99 | die "$usage" if (!defined($remote) && !defined($filename)); |
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100 | |
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101 | if (defined($filename)) { |
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102 | &parse_config("$filename", \%opts) || |
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103 | die "Cannot read config file $filename: $!\n"; |
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104 | |
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105 | foreach my $opt (@expected_opts) { |
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106 | warn "Missing $opt option\n" if (!defined($opts{$opt})); |
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107 | } |
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108 | |
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109 | $active = 1 if ($opts{'active'} =~ /true/i); |
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110 | $tunnelcfg = 1 if ($opts{'tunnelcfg'} =~ /true/i); |
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111 | $type = $opts{'type'}; |
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112 | $type =~ tr/A-Z/a-z/; |
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113 | $remote_script_dir = $opts{'remotescriptdir'} || "."; |
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114 | $event_repeater = $opts{'eventrepeater'}; |
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115 | $remote_config_file = $opts{'remoteconfigfile'}; |
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116 | $remote_config_file = "-f $remote_config_file" if $remote_config_file; |
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117 | |
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118 | if (defined($opts{'fsname'})) { |
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119 | $ssh_port_fwds = "-R :$SMBFS_PORT:$opts{'fsname'}:$SMBFS_PORT "; |
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120 | } |
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121 | |
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122 | if (defined($opts{'bossname'})) { |
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123 | $ssh_port_fwds .= "-R :$TMCD_PORT:$opts{'bossname'}:$TMCD_PORT "; |
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124 | } |
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125 | |
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126 | if (defined($opts{'eventservername'})) { |
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127 | $ssh_port_fwds .= "-R :$remote_pubsub_port:$opts{'eventservername'}:" . |
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128 | "$PUBSUB_PORT "; |
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129 | } |
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130 | if (defined($opts{'remoteeventservername'})) { |
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131 | $ssh_port_fwds .= "-L :$remote_pubsub_port:" . |
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132 | "$opts{'remoteeventservername'}:$PUBSUB_PORT "; |
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133 | } |
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134 | |
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135 | $ssh_port_fwds = "" if ($opts{'type'} eq 'experiment'); |
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136 | |
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137 | print "ssh_port_fwds = $ssh_port_fwds\n" if ($debug); |
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138 | } |
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139 | |
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140 | |
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141 | # Both sides need to have GatewayPorts and PermitTunnel set. Copy the existing |
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142 | # sshd_config, making sure GatewayPorts and PermitTunnel are set to yes, |
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143 | # replace the original, and restart sshd. |
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144 | my $ports_on = 0; |
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145 | my $tunnel_on = 0; |
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146 | |
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147 | my $conf = new IO::File($sshd_config) || die "Can't open $sshd_config: $!\n"; |
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148 | my $new_conf = new IO::File(">/tmp/sshd_config") || |
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149 | die "Can't open new ssh_config: $!\n"; |
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150 | |
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151 | while(<$conf>) { |
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152 | s/^\s*GatewayPorts.*/GatewayPorts yes/ && do { |
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153 | print $new_conf $_ unless $ports_on++; |
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154 | next; |
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155 | }; |
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156 | s/^\s*PermitTunnel.*/PermitTunnel yes/ && do { |
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157 | print $new_conf $_ unless $tunnel_on++; |
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158 | next; |
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159 | }; |
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160 | print $new_conf $_; |
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161 | } |
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162 | print $new_conf "GatewayPorts yes\n" unless $ports_on; |
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163 | print $new_conf "PermitTunnel yes\n" unless $tunnel_on; |
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164 | $conf->close(); |
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165 | $new_conf->close(); |
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166 | |
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167 | copy("/tmp/sshd_config", $sshd_config) || |
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168 | die "Cannot replace $sshd_config: $!\n"; |
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169 | |
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170 | system("/etc/rc.d/sshd restart"); |
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171 | |
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172 | |
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173 | # Need these to make the Ethernet tap and bridge to work... |
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174 | system("kldload /boot/kernel/bridgestp.ko") |
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175 | if -r "/boot/kernel/bridgestp.ko"; |
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176 | system("kldload /boot/kernel/if_bridge.ko"); |
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177 | system("kldload /boot/kernel/if_tap.ko"); |
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178 | |
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179 | if (!$remote) { |
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180 | # At the Berkeley federant, the outgoing addresses are fixed and based on |
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181 | # the control net. We do set up a host route to the peer. This is a |
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182 | # simplified version of the DETER setup. |
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183 | |
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184 | &setup_tunnel_cfg(%opts); |
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185 | } |
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186 | |
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187 | if (!$remote) { |
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188 | system("umask 077 && cp $opts{'privkeys'} /root/.ssh/id_rsa"); |
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189 | system("umask 077 && cp $opts{'pubkeys'} /root/.ssh/id_rsa.pub"); |
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190 | system("umask 077 && cat $opts{'pubkeys'} >> /root/.ssh/authorized_keys"); |
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191 | } |
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192 | |
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193 | if ($active) { |
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194 | # If we're the initiator, open up a separate tunnel to the remote |
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195 | # host for each of the different experiment net interfaces on this |
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196 | # machine. Execute this startup script on the far end, but with |
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197 | # the -r option to indicate that it's getting invoked remotely and |
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198 | # we should just handle the remote-end tasks. |
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199 | |
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200 | # Set up synchronization, so that the various user machines won't try to |
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201 | # contact boss before the tunnels are set up. (Thanks jjh!) |
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202 | |
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203 | do { |
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204 | system("$NC -z $opts{'peer'} $SSH_PORT"); |
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205 | } until (!$?); |
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206 | |
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207 | # XXX: Do we need to clear out previously created bridge interfaces? |
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208 | |
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209 | my $count = 0; |
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210 | my @SSHCMD; |
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211 | |
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212 | # If we are just setting up a control net connection, just fire up |
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213 | # ssh with the null command, and hang loose. |
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214 | |
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215 | if ($type eq "control") { |
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216 | system("$SSH $ssh_port_fwds -Nno \"StrictHostKeyChecking no\" $opts{'peer'} &"); #or die "Failed to run ssh"; |
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217 | |
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218 | exit; |
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219 | } |
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220 | |
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221 | open(IFFILE, "/var/emulab/boot/ifmap") || die "couldn't open ifmap\n"; |
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222 | while (<IFFILE>) { |
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223 | my @a = split(' '); |
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224 | my $iface = $a[0]; |
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225 | my $addr = $a[1]; |
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226 | my $bridge = "bridge" . $count; |
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227 | my $tun = "tap" . $count; |
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228 | |
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229 | print "Found $iface, $addr, to bridge on $bridge\n" if ($debug); |
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230 | |
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231 | # Note that we're going to fire off an ssh which will never return; |
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232 | # we need the connection to stay up to keep the tunnel up. |
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233 | # In order to check for problems, we open it this way and read |
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234 | # the expected single line of output when the tunnel is connected. |
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235 | |
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236 | # The Tunnel option specifies the level to tunnel at. Ethernet creates |
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237 | # a tap device rather than a tun device. Strict host key checking |
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238 | # avoids asking the user to OK a strange host key. |
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239 | my $cmd = "$SSH -w $count:$count -o \"Tunnel ethernet\" " . |
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240 | "-o \"StrictHostKeyChecking no\" " . |
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241 | "$opts{'peer'} \"$remote_script_dir/fed-tun.pl " . |
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242 | "$remote_config_file -r $addr $count\" & |"; |
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243 | |
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244 | print "$cmd\n" if $debug; |
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245 | open($SSHCMD[$count], $cmd) or die "Failed to run ssh"; |
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246 | |
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247 | my $check = <$SSHCMD[$count]>; # Make sure something ran... |
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248 | print "Got line [$check] from remote side\n" if ($debug); |
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249 | |
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250 | &setup_bridging($tun, $bridge, $iface, $addr); |
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251 | $count++; |
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252 | $ssh_port_fwds = ""; # only do this on the first connection |
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253 | } |
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254 | close(IFFILE); |
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255 | |
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256 | # Start a local event repeater (unless we're missing parameters |
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257 | die "Missing event repeater params (No config file ?)\n" |
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258 | unless $event_repeater && $opts{'remoteexperiment'} && |
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259 | $opts{'localexperiment'}; |
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260 | |
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261 | print "Starting event repeater\n" if $debug; |
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262 | |
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263 | print("$event_repeater -M -P $remote_pubsub_port -S localhost " . |
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264 | "-E $opts{'remoteexperiment'} -e $opts{'localexperiment'}\n") |
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265 | if $debug; |
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266 | # Connect to the forwarded pubsub port on this host to listen to the |
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267 | # other experiment's events, and to the local experiment to forward |
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268 | # events. |
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269 | system("$event_repeater -M -P $remote_pubsub_port -S localhost " . |
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270 | "-E $opts{'remoteexperiment'} -e $opts{'localexperiment'}"); |
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271 | warn "Event repeater returned $?\n" if $?; |
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272 | } elsif ($remote) { |
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273 | # We're on the remote system; figure out which interface to |
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274 | # tweak, based on the IP address passed in. |
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275 | |
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276 | my $iter = 0; |
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277 | my $iface; |
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278 | |
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279 | open(RTFILE, "$ROUTE_GET $addr |") || die "couldn't do $ROUTE_GET\n"; |
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280 | while (<RTFILE>) { |
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281 | if (/interface: (\w+)/) { |
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282 | $iface = $1; |
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283 | } |
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284 | } |
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285 | close(RTFILE); |
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286 | |
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287 | die "Couldn't find interface to use." if (!defined($iface)); |
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288 | my $bridge = "bridge" . $count; |
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289 | my $tun = "tap" . $count; |
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290 | |
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291 | &setup_bridging($tun, $bridge, $iface, $addr); |
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292 | print "Remote connection all set up!\n"; # Trigger other end with output |
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293 | |
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294 | # If this is the first remote invocation on a control gateway, start the |
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295 | # event repeater. |
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296 | |
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297 | my $file = new IO::File(">/tmp/remote"); |
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298 | print($file "hello!!!\n") if $file; |
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299 | if ( $count == 0 && $type ne "experiment" ) { |
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300 | my $remote_pubsub_port = $PUBSUB_PORT - 1; # There will be a local |
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301 | # pubsubd running, so we |
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302 | # dodge the port on the |
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303 | # remote tunnel node. |
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304 | print($file "In here!\n"); |
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305 | # Make sure we have the relevant parameters |
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306 | die "Missing event repeater params (No config file ?)\n" |
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307 | unless $event_repeater && $opts{'remoteexperiment'} && |
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308 | $opts{'localexperiment'}; |
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309 | |
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310 | print "Starting event repeater\n" if $debug; |
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311 | |
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312 | print($file "$event_repeater -P $remote_pubsub_port -S localhost " . |
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313 | "-E $opts{'remoteexperiment'} -e $opts{'localexperiment'}\n") |
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314 | if $file; |
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315 | # Connect to the forwarded pubsub port on this host to listen to the |
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316 | # other experiment's events, and to the local experiment to forward |
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317 | # events. |
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318 | system("$event_repeater -P $remote_pubsub_port -S localhost " . |
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319 | "-E $opts{'remoteexperiment'} -e $opts{'localexperiment'}"); |
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320 | warn "Event repeater returned $?\n" if $?; |
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321 | } |
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322 | $file->close() if $file; |
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323 | } else { |
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324 | print "inactive end of a connection, finishing" if ($debug); |
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325 | } |
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326 | |
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327 | print "all done!\n" if ($debug); |
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328 | exit; |
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329 | |
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330 | |
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331 | # Set up the bridging for the new stuff... |
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332 | |
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333 | sub setup_bridging($; $; $; $) { |
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334 | my ($tun, $bridge, $iface, $addr) = @_; |
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335 | |
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336 | print "Waiting to see if new iface $tun is up\n" if ($debug); |
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337 | |
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338 | do { |
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339 | sleep 1; |
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340 | system("$IFCONFIG $tun"); |
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341 | } until (!$?); |
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342 | |
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343 | print "setting up $bridge with $iface and nuking $addr\n" if ($debug); |
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344 | |
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345 | system("ifconfig $bridge create"); |
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346 | system("ifconfig $iface delete $addr"); |
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347 | system("ifconfig $bridge addm $iface up"); |
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348 | system("ifconfig $bridge addm $tun"); |
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349 | } |
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350 | |
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351 | # Set up tunnel info for UCB testbed |
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352 | |
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353 | sub setup_tunnel_cfg { |
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354 | my (%opts) = @_; |
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355 | my $tunnel_iface = "em5"; |
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356 | my $control_iface = "em4"; |
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357 | my $tunnel_prefix = "192.154.6."; |
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358 | my $tunnel_router = "192.154.6.1"; |
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359 | my $netmask = "255.255.255.0"; |
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360 | my $ipipe = new IO::Pipe(); |
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361 | my $pcnum; |
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362 | |
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363 | $ipipe->reader("$IFCONFIG $control_iface"); |
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364 | |
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365 | while (<$ipipe>) { |
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366 | /inet\s+\d+\.\d+\.\d+\.(\d+)/ && do { |
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367 | $pcnum = $1; |
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368 | last; |
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369 | }; |
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370 | } |
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371 | $ipipe->close(); |
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372 | $pcnum += 50; |
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373 | $pcnum &=0xff if $pcnum > 255; |
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374 | |
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375 | system("ifconfig $tunnel_iface $tunnel_prefix$pcnum netmask $netmask"); |
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376 | warn "configuration of tunnel interface failed" if ($?); |
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377 | |
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378 | # Sometimes the insertion of DNS names lags a bit. Retry this |
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379 | # configuration a few times to let DNS catch up. Might want to really |
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380 | # check the DNS name before we try this... |
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381 | my $config_succeeded = 0; |
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382 | my $tries = 0; |
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383 | my $max_retries = 30; |
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384 | |
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385 | do { |
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386 | system("route add $opts{'peer'} $tunnel_router"); |
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387 | if ( $? ) { |
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388 | warn "configuration routes via tunnel interface failed"; |
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389 | $tries++; |
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390 | sleep(10); |
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391 | } |
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392 | else { $config_succeeded = 1; } |
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393 | } until ( $config_succeeded || $tries > $max_retries ); |
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394 | |
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395 | print "setup_tunnel_cfg done\n" if ($debug); |
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396 | } |
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397 | |
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398 | # Trick config-file parsing code from Ted Faber: |
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399 | |
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400 | # Parse the config file. The format is a colon-separated parameter name |
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401 | # followed by the value of that parameter to the end of the line. This parses |
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402 | # that format and puts the parameters into the referenced hash. Parameter |
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403 | # names are mapped to lower case, parameter values are unchanged. Returns 0 on |
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404 | # failure (e.g. file open) and 1 on success. |
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405 | sub parse_config { |
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406 | my($file, $href) = @_; |
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407 | my($fh) = new IO::File($file); |
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408 | |
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409 | unless ($fh) { |
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410 | warn "Can't open $file: $!\n"; |
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411 | return 0; |
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412 | } |
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413 | |
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414 | while (<$fh>) { |
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415 | next if /^\s*#/ || /^\s*$/; # Skip comments & blanks |
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416 | chomp; |
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417 | /^([^:]+):\s*(.*)/ && do { |
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418 | my($key) = $1; |
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419 | |
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420 | $key =~ tr/A-Z/a-z/; |
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421 | $href->{$key} = $2; |
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422 | next; |
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423 | }; |
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424 | warn "Unparasble line in $file: $_\n"; |
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425 | } |
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426 | $fh->close(); # It will close when it goes out of scope, but... |
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427 | return 1; |
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428 | } |
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