Mercurial > p > roundup > code

annotate roundup/install_util.py @ 5212:d4cc71beb102

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Added support for SameSite cookie option for CSRF prevention This was an easy addon compared to the complexity of the CSRF nonce support. It only works in chromium browsers (Chrome, Opera...) at the moment. But there is recent activity on implementing it in firefox. Who know when edge/ie will adopt it. So csrf nonce and header analysis will be needed for a while.
author John Rouillard <rouilj@ieee.org>
date Sun, 19 Mar 2017 19:01:41 -0400
parents 9ba03348f923
children 88cf5614e0f4
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rev   line source
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18
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19 """Support module to generate and check fingerprints of installed files.
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20 """
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21 __docformat__ = 'restructuredtext'
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22
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23 import os, shutil
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24 from hashlib import sha1
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25
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26 sgml_file_types = [".xml", ".ent", ".html"]
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27 hash_file_types = [".py", ".sh", ".conf", ".cgi"]
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28 slast_file_types = [".css"]
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29
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30 digested_file_types = sgml_file_types + hash_file_types + slast_file_types
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31
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32 def extractFingerprint(lines):
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33 # get fingerprint from last line
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34 if lines[-1].startswith("#SHA: "):
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35 # handle .py/.sh comment
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36 return lines[-1][6:].strip()
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37 elif lines[-1].startswith("<!-- SHA: "):
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38 # handle xml/html files
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39 fingerprint = lines[-1][10:]
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40 fingerprint = fingerprint.replace('-->', '')
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41 return fingerprint.strip()
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42 elif lines[-1].startswith("/* SHA: "):
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43 # handle css files
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44 fingerprint = lines[-1][8:]
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45 fingerprint = fingerprint.replace('*/', '')
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46 return fingerprint.strip()
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47 return None
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48
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49 def checkDigest(filename):
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50 """Read file, check for valid fingerprint, return TRUE if ok"""
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51 # open and read file
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52 inp = open(filename, "r")
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53 lines = inp.readlines()
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54 inp.close()
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55
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56 fingerprint = extractFingerprint(lines)
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57 if fingerprint is None:
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58 return 0
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59 del lines[-1]
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60
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61 # calculate current digest
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62 digest = sha1()
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63 for line in lines:
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64 digest.update(line)
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65
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66 # compare current to stored digest
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67 return fingerprint == digest.hexdigest()
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69
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70 class DigestFile:
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71 """ A class that you can use like open() and that calculates
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72 and writes a SHA digest to the target file.
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73 """
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74
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75 def __init__(self, filename):
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76 self.filename = filename
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77 self.digest = sha1()
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78 self.file = open(self.filename, "w")
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79
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80 def write(self, data):
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81 lines = data.splitlines()
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82 # if the file is coming from an installed tracker being used as a
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83 # template, then we will want to re-calculate the SHA
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84 fingerprint = extractFingerprint(lines)
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85 if fingerprint is not None:
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86 data = '\n'.join(lines[:-1]) + '\n'
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87 self.file.write(data)
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88 self.digest.update(data)
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89
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90 def close(self):
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91 file, ext = os.path.splitext(self.filename)
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92
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93 if ext in sgml_file_types:
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94 self.file.write("<!-- SHA: %s -->\n" % (self.digest.hexdigest(),))
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95 elif ext in hash_file_types:
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96 self.file.write("#SHA: %s\n" % (self.digest.hexdigest(),))
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97 elif ext in slast_file_types:
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98 self.file.write("/* SHA: %s */\n" % (self.digest.hexdigest(),))
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99
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100 self.file.close()
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101
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102
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103 def copyDigestedFile(src, dst, copystat=1):
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104 """ Copy data from `src` to `dst`, adding a fingerprint to `dst`.
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105 If `copystat` is true, the file status is copied, too
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106 (like shutil.copy2).
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107 """
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108 if os.path.isdir(dst):
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109 dst = os.path.join(dst, os.path.basename(src))
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110
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111 dummy, ext = os.path.splitext(src)
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112 if ext not in digested_file_types:
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113 if copystat:
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114 return shutil.copy2(src, dst)
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115 else:
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116 return shutil.copyfile(src, dst)
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117
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118 fsrc = None
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119 fdst = None
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120 try:
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121 fsrc = open(src, 'r')
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122 fdst = DigestFile(dst)
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123 shutil.copyfileobj(fsrc, fdst)
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124 finally:
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125 if fdst: fdst.close()
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126 if fsrc: fsrc.close()
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127
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128 if copystat: shutil.copystat(src, dst)
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129
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130
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131 def test():
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132 import sys
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133
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134 testdata = open(sys.argv[0], 'r').read()
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135
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136 for ext in digested_file_types:
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137 testfile = "__digest_test" + ext
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138
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139 out = DigestFile(testfile)
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140 out.write(testdata)
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141 out.close()
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143 assert checkDigest(testfile), "digest ok w/o modification"
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144
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145 mod = open(testfile, 'r+')
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146 mod.seek(0)
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147 mod.write('# changed!')
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148 mod.close()
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150 assert not checkDigest(testfile), "digest fails after modification"
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151
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152 os.remove(testfile)
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154
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155 if __name__ == '__main__':
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156 test()
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157
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158 # vim: set filetype=python ts=4 sw=4 et si
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