133 lines
No EOL
4.2 KiB
Ruby
Executable file
133 lines
No EOL
4.2 KiB
Ruby
Executable file
#!/usr/bin/env ruby
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# ARRIS DG860A NVRAM Backup 'Compressor/Decompressor', it really does xor?
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# Gleaned from sc_mix executable in firmware dump.
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#
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# Backup file is world readable without authentication and contains password
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# information in plain text.
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#
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# box:arris-dev cosmo$ wget http://192.168.0.1/router.data
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# --2013-10-17 18:21:28-- http://192.168.0.1/router.data
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# Connecting to 192.168.0.1:80... connected.
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# HTTP request sent, awaiting response... 200 OK
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# Length: 3518 (3.4K) [application/octet-stream]
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# Saving to: ‘router.data’
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#
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# 100%[=============================================================================================================>] 3,518 --.-K/s in 0s
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#
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# 2013-10-17 18:21:28 (108 MB/s) - ‘router.data’ saved [3518/3518]
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#
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# box:arris-dev cosmo$ tar vxf router.data
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# x backup/
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# x backup/sc_nvram.usr.sc
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# x backup/sc_nvram.sc
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# box:arris-dev cosmo$ sudo ./sc_mix.rb -u -s backup/sc_nvram.usr.sc -d sc_nvram_dump
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# Password:
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# box:arris-dev cosmo$ cat sc_nvram_dump | tr "\000\000" "\000" | tr "\000" "\n" | grep sysAdminPassword
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# sysAdminPassword[0]=test123
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# box:arris-dev cosmo$
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#
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#
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#
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require 'optparse'
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require 'highline/import'
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require 'zlib'
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def Compress(infile, outfile)
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instream = nil
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outstream = nil
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size = 0
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calculatedcrc = 0
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data=''
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size = File.size?(infile)
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instream = File.open(infile,'r')
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data = instream.read()
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data = data.bytes.map { |a| a ^ 0xFFFFFFAA }.pack('c*')
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instream.close() if !instream.nil?
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outstream = File.open(outfile,'w')
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outstream.write("\x00NOF")
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outstream.write([size].pack('L>'))
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calculatedcrc = Zlib::crc32(data)
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outstream.write([calculatedcrc].pack('L>'))
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outstream.write([size].pack('L>'))
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outstream.write("\x00\x00\x00\x00" * 6)
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outstream.write(data)
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outstream.close() if !outstream.nil?
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end
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def Decompress(infile, outfile)
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instream = nil
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outstream = nil
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size = 0
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embeddedcrc = 0
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calculatedcrc = 0
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data=''
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if !(File::size?(infile) >= 0x28)
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puts "[ERROR]: Source file size is insufficient(Smaller then 0x28 bytes)"
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exit
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end
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instream = File::open(infile,'r')
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if instream.read(4) != "\x00NOF"
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instream.close() if !instream.nil?
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puts "[ERROR]: Source file contains invalid magic(\\x00NOF)"
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exit
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end
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size = instream.read(4).unpack("L>")[0]
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embeddedcrc = instream.read(4).unpack("L>")[0]
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if !(File.size?(infile) >= (0x28+size))
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puts "[ERROR]: Source file size if insufficient(Smaller then 0x" + (0x28+minsize).to_s(16) + ")"
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instream.close() if !instream.nil?
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end
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instream.seek(0x28,IO::SEEK_SET)
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data = instream.read(size)
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calculatedcrc = Zlib::crc32(data)
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if embeddedcrc != calculatedcrc
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puts "[ERROR]: Checksum mismatch"
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instream.close() if !instream.nil?
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exit
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end
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outstream = File::open(outfile,'w')
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outstream.write(data.bytes.map { |a| a ^ 0xFFFFFFAA }.pack('c*'))
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instream.close() if !instream.nil?
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outstream.close() if !outstream.nil?
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end
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#begin
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if __FILE__ == $0
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options = {}
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opt_parser = OptionParser.new do |opts|
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opts.banner = "Usage: sc_mix.rb -s <Src_PATH> -d <Dest_PATH>"
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opts.separator "Usage:"
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opts.on('-s', '--source Src_PATH', 'Source File') { |v| options[:source_file] = v }
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opts.on('-d', '--destination Dest_PATH', 'Destination File') { |v| options[:destination_file] = v }
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opts.on('-u', 'Uncompress') { options[:uncompress] = true }
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opts.on_tail("-h", "Show this message") do
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puts opts
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exit
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end
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end
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opt_parser.parse!
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if options[:source_file].nil? or options[:destination_file].nil?
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puts opt_parser
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exit
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end
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if !File::exists?(options[:source_file]) or !File::readable?(options[:source_file])
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puts "[ERROR]: File does not exist or there are insufficient privileges(sudo?)"
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exit
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end
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if File::exists?(options[:destination_file])
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if !agree("[ERROR]: File exists attempt to overwrite[yes/no]? ")
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exit
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end
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if !File::writable?(options[:destination_file])
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puts "[ERROR]: File is not writeable is there insufficient privileges(sudo?)"
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exit
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end
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end
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if !options[:uncompress]
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puts "[WARNING]: Compression is currently beta"
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Compress(options[:source_file], options[:destination_file])
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else
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Decompress(options[:source_file], options[:destination_file])
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end
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end |