Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/genpwd.py @ 243:86417af99561

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genpwd: Implement ascii and alnum and their safe variants
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 08 Feb 2025 10:39:49 +0100
parents ae9bc3006efc
children 42f7ecd70ec1
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2018 Franz Glasner
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4 # :Copyright: (c) 2025 Franz Glasner
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5 # :License: BSD-3-Clause
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6 # :-
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7 r"""Generate passwords.
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8
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9 Usage: genpwd.py [ Options ] required_length
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10
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11 Options:
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12
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13 --type, -t web, web-safe, web-safe2, base64, base32, ascii85
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14
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15 :Author: Franz Glasner
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16
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17 """
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18
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19 from __future__ import (division, absolute_import, print_function)
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20
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21 import argparse
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22 import base64
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23 import binascii
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24 import os
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25 import sys
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26
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27 from . import (__version__, __revision__)
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28
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29
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30 WEB_CHARS = (b"ABCDEFGHIJKLMNOPQRSTUVWYXZabcdefghijklmnopqrstuvwxyz"
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31 b"0123456789.,-_;!()[]{}*")
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32 WEB_SAFE_CHARS = (b"ABCDEFGHJKLMNPQRSTUVWYXZabcdefghijkmnopqrstuvwxyz"
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33 b"23456789.,-_;!")
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34 WEB_SAFE2_CHARS = b".,-_;!" + WEB_SAFE_CHARS # prefer punctionation chars
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35 # Most visible characters but no space
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36 FULL_ASCII = (b"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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37 b"abcdefghijklmnopqrstuvwxyz!#$%&/()*+-.,:;<=>?@^_`[\\]{|}'\"~")
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38 #
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39 # A safer variant of FULL_ASCII:
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40 # - no characters that are visually similar (0O, 1lI)
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41 # - no characters with dead keys on german keyboards
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42 # - no backslash (too easily interpret as escape character
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43 # - no single or double quotes
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44 SAFE_ASCII = (b"23456789ABCDEFGHJKLMNPQRSTUVWXYZ"
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45 b"abcdefghijkmnopqrstuvwxyz!#$%&/()*+-.,:;<=>?@_[]{|}~")
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46 # just numeric and alphabetic
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47 ALNUM = b"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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48 # safer alpha-numberic without visually similar characters
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49 SAFE_ALNUM = b"23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
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50
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51
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52 PY2 = sys.version_info[0] <= 2
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53
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54
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55 def main(argv=None):
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56 aparser = argparse.ArgumentParser(
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57 description="A simple password generator for password of a given"
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58 " length within a character repertoire",
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59 fromfile_prefix_chars='@')
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60 aparser.add_argument(
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61 "--version", "-v", action="version",
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62 version="%s (rv:%s)" % (__version__, __revision__))
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63 aparser.add_argument(
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64 "-E", dest="use_bin_length", action="store_true",
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65 help="For some repertoires make OUTPUT-LENGTH the number of bytes"
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66 " that is to be read from random sources instead of output bytes")
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67 aparser.add_argument(
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68 "--repertoire", "--type", "-t",
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69 choices=("web", "web-safe", "web-safe2", "ascii", "safe-ascii",
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70 "alnum", "safe-alnum",
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71 "bin-base64", "bin-urlsafe-base64", "bin-base32",
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72 "bin-ascii85", "bin-hex", ),
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73 default="web-safe2",
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74 help="""
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75 Select from a character repertoire.
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76 All repertoires that start with "bin-" just encode the output of
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77 "os.urandom()" with the selected encoder.
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78 Default: web-safe2
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79 """)
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80 aparser.add_argument(
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81 "req_length", metavar="OUTPUT-LENGTH", type=int,
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82 help="The required length of the generated output")
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83
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84 opts = aparser.parse_args(args=argv)
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85
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86 if opts.repertoire == "web":
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87 pwd = gen_from_repertoire(opts.req_length, WEB_CHARS)
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88 elif opts.repertoire == "web-safe":
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89 pwd = gen_from_repertoire(opts.req_length, WEB_SAFE_CHARS)
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90 elif opts.repertoire == "web-safe2":
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91 pwd = gen_from_repertoire(opts.req_length, WEB_SAFE2_CHARS)
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92 elif opts.repertoire == "ascii":
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93 pwd = gen_from_repertoire(opts.req_length, FULL_ASCII)
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94 elif opts.repertoire == "safe-ascii":
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95 pwd = gen_from_repertoire(opts.req_length, SAFE_ASCII)
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96 elif opts.repertoire == "alnum":
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97 pwd = gen_from_repertoire(opts.req_length, ALNUM)
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98 elif opts.repertoire == "safe-alnum":
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99 pwd = gen_from_repertoire(opts.req_length, SAFE_ALNUM)
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100 elif opts.repertoire == "bin-base64":
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101 encoder = base64.b64encode
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102 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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103 rstrip_chars=b"=")
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104 elif opts.repertoire == "bin-urlsafe-base64":
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105 encoder = base64.urlsafe_b64encode
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106 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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107 rstrip_chars=b"=")
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108 elif opts.repertoire == "bin-base32":
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109 encoder = base64.b32encode
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110 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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111 rstrip_chars=b"=")
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112 elif opts.repertoire == "bin-ascii85":
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113 encoder = base64.a85encode
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114 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder)
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115 elif opts.repertoire == "bin-hex":
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116 encoder = binascii.hexlify
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117 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder)
227
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118 else:
231
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119 raise NotImplementedError("type not yet implemented: %s"
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120 % opts.repertoire)
235
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121 if opts.use_bin_length:
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122 if len(pwd) < opts.req_length:
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123 raise AssertionError("internal length mismatch")
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124 else:
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125 if len(pwd) != opts.req_length:
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126 raise AssertionError("internal length mismatch")
234
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127 if not PY2:
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128 pwd = pwd.decode("ascii")
227
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129 print(pwd)
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130
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131
239
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132 def gen_from_repertoire(length, repertoire):
240
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133 """Select `length` characters randomly from given character repertoire
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134 `repertoire`.
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135
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136 """
227
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137 assert len(repertoire) <= 256
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138 pwd = []
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139 while len(pwd) < length:
238
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140 rndbytes = os.urandom(16)
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141 for c in rndbytes:
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142 if PY2:
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143 c = ord(c)
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144 if c < len(repertoire):
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145 pwd.append(repertoire[c])
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146 if len(pwd) >= length:
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147 break
227
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148 if PY2:
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149 pwd = b''.join(pwd)
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150 else:
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151 pwd = bytes(pwd)
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152 return pwd
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153
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154
235
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155 def gen_bin(length, use_bin_length, encoder, rstrip_chars=None):
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156 """Generate from :func:`os.urandom` and just encode with given `encoder`.
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157
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158 """
227
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159 pwd = encoder(os.urandom(length))
235
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160 return pwd.rstrip(rstrip_chars) if use_bin_length else pwd[:length]
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161
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
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162
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163 if __name__ == "__main__":
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164 main()