Mercurial > ppgen
annotate ppgen.py @ 9:35c468a37b54
Extend command line options to select 2nd language
| author | Bernhard Reiter <bernhard@intevation.de> |
|---|---|
| date | Wed, 02 Oct 2019 15:04:28 +0200 |
| parents | 200c2c3c5f67 |
| children | 15d5b3961009 |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python3 |
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2 """Create a random passphrase from a dictionary of words. BETA |
| 0 | 3 |
| 4 Relies on the entropy of python's | |
| 5 random.SystemRandom class | |
| 6 which (according to the documentation) calls os.urandom() | |
| 7 which (according to the documentation) calls the operating system | |
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8 specific randomness source which "should be unpredictable |
| 0 | 9 enough for cryptographic applications" |
| 10 | |
| 11 Requires: | |
| 12 * Python v>=3.2 | |
| 13 * a dictionary, Ding's trans-de-en by default. | |
| 14 E.g. on a Debian/Ubuntu system in package "trans-de-en". | |
| 15 or from http://ftp.tu-chemnitz.de/pub/Local/urz/ding/de-en/ | |
| 16 | |
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17 Uses a hardcoded filepath and language. |
| 0 | 18 Search for **customize** below to change it. |
| 19 | |
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20 Related: There is a Go implementation started by Sascha L. Teichmann at |
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21 https://bitbucket.org/s_l_teichmann/ppgen |
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22 |
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23 |
| 8 | 24 Copyright 2016, 2017, 2018 by Intevation GmbH. |
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25 Author: Bernhard E. Reiter <bernhard@intevation.de> |
| 0 | 26 |
| 27 This file is Free Software under the Apache 2.0 license and thus | |
| 28 comes without any warranty (to extend permissible under applicable law). | |
| 29 """ | |
| 30 | |
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31 import argparse |
| 0 | 32 import math |
| 33 import re | |
| 34 import sys | |
| 35 | |
| 36 from random import SystemRandom | |
| 37 _srandom = SystemRandom() | |
| 38 | |
| 39 tainted = False # to be set if we find a hint that the passphrase may be weak | |
| 40 | |
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41 |
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42 def buildDictionary(options): |
| 0 | 43 """Build up a dictionary of unique words, calculate stats.""" |
| 44 global tainted | |
| 45 d = [] | |
| 46 | |
| 47 # dictionary for testing | |
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48 #d = ["abc", "aBc", "cde", "efg", "hij", "blubber", |
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49 # "jikf", "zug", "lmf", "opq"] |
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50 # second test dictionary to show that different string functions are used. |
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51 #d = [''.join('A' * 1000) for _ in range(1000)] |
| 0 | 52 |
| 53 # Using the dictionary from Ding **customize** | |
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54 d = readDingDict(options, |
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55 filename="/usr/share/trans/de-en", |
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56 useLeft=not options.second_language) |
| 0 | 57 |
| 8 | 58 # for debugging purposes, dump dictionary |
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59 if options.ddump_filename: |
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60 print("Writing out dictionary in '{}'.".format(options.ddump_filename)) |
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61 with open(options.ddump_filename, "w") as f: |
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62 for i in d: |
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63 f.write("{}\n".format(i)) |
| 0 | 64 |
| 65 # Print some stats on the dictionary to be used | |
| 66 dl = len(d) | |
| 8 | 67 if not options.just_passphrase: |
| 68 print("Found {:d} dictionary entries.".format(dl)) | |
| 69 print("|= Number of words |= possibilities |") | |
| 70 for i in range(1, 5): | |
| 71 print("| {:2d} | 2^{:4.1f} |".format( | |
| 72 i, math.log(dl**i, 2))) | |
| 73 | |
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74 if dl < 8000: |
| 8 | 75 sys.stderr.write("!Your dictionary is below 8k entries, " |
| 76 "that is quite small!\n") | |
| 0 | 77 tainted = True |
| 78 return d | |
| 79 | |
| 80 | |
| 8 | 81 def readDingDict(options, filename="/usr/share/trans/de-en", useLeft=False): |
| 0 | 82 """Read dictionary with unique words from file in Ding format. |
| 83 | |
| 84 useLeft: Boolean to control which language to use | |
| 85 | |
| 86 TODO: add option to use both languages for people that speak them both? | |
| 87 """ | |
| 88 | |
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89 dset = set() # using the datatype 'set' to avoid duplicates |
| 0 | 90 |
| 91 splitter = re.compile(r"""\ \|\ # first pattern ' | ' | |
| 92 |;\ # second pattern '; ' | |
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93 |(?<=\S)/(?=\S) # 3.: '/' surrounded by chars |
| 0 | 94 |\s+ # by whitespace |
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95 """, re.VERBOSE) |
| 0 | 96 |
| 8 | 97 if not options.just_passphrase: |
| 98 print("Reading entries from {}.".format(filename), end='') | |
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99 counter = 0 # for progress or stopping early |
| 0 | 100 with open(filename, "r") as f: |
| 101 for line in f: | |
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102 if line[0] == '#': |
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103 continue |
| 0 | 104 |
| 105 # languages are separated by " :: " | |
| 106 p = line.partition(" :: ") | |
| 107 languageEntry = p[0] if useLeft else p[2] | |
| 108 | |
| 109 for word in splitter.split(languageEntry): | |
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110 word = word.strip('(",.)\'!:;<>').rstrip('/') |
| 0 | 111 if len(word) > 2 and not word[0] in '[{/': |
| 112 dset.add(word) | |
| 113 | |
| 114 #TODO: check for very common words and remove them? | |
| 115 | |
| 116 counter += 1 | |
| 117 ## stop early when debugging | |
| 118 #if counter > 10: break | |
| 8 | 119 if not options.just_passphrase and counter % 10000 == 0: |
| 0 | 120 print('.', end='') |
| 121 sys.stdout.flush() | |
| 8 | 122 if not options.just_passphrase: |
| 123 print() | |
| 0 | 124 |
| 125 return list(dset) | |
| 126 | |
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127 |
| 0 | 128 def main(): |
| 129 global tainted | |
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130 |
| 8 | 131 parser = argparse.ArgumentParser( |
| 132 description=__doc__.splitlines()[0], | |
| 133 formatter_class=argparse.ArgumentDefaultsHelpFormatter) | |
| 134 parser.add_argument('-n', '--number-of-words', type=int, default=4, | |
| 135 help='how many words to draw for the passphrase, ' | |
| 136 'most useful with -j') | |
| 137 parser.add_argument('-j', '--just-passphrase', action="store_true", | |
| 138 help='only output the passphrase on a single line') | |
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139 parser.add_argument('--ddump-filename', |
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140 help='filename to dump the dictionary to') |
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141 parser.add_argument('-2', '--second-language', action='store_true', |
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142 help='use the second language in the ding dictionary') |
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143 options = parser.parse_args() |
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144 |
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145 dictionary = buildDictionary(options) |
| 0 | 146 |
| 8 | 147 how_many = options.number_of_words |
| 0 | 148 |
| 8 | 149 output_string = "" |
| 150 if not options.just_passphrase: | |
| 151 print("\nGenerated passphrase with {}" | |
| 152 " randomly selected words:\n".format(how_many)) | |
| 153 print(" ", end='') | |
| 154 separator = '\n ' | |
| 155 else: | |
| 156 separator = ' ' | |
| 157 | |
| 158 # use a dictionary `words` with lower cased words for a rudimentary check | |
| 0 | 159 words = {} |
| 8 | 160 for x in range(how_many): |
| 0 | 161 word = _srandom.choice(dictionary) |
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162 words[word.lower()] = True |
| 8 | 163 output_string += word + separator |
| 0 | 164 |
| 8 | 165 print(output_string) |
| 166 | |
| 167 if len(words) < how_many: | |
| 168 sys.stderr.write("! You've drawn a word more than once, this means:\n" | |
| 169 "! Your random generation is weak" | |
| 170 " or you are being very lucky.\n") | |
| 0 | 171 tainted = True |
| 172 | |
| 173 if tainted: | |
| 8 | 174 sys.exit("!!! Don't use the resulting passphrase !!!") |
| 0 | 175 |
| 176 if __name__ == "__main__": | |
| 177 main() |