Mercurial > hgrepos > Python > apps > py-cutils
annotate cutils/genpwd.py @ 264:c657828cf62f
Remove executable flag for cutils/genpwd.py
| author | Franz Glasner <fzglas.hg@dom66.de> |
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| date | Sun, 16 Feb 2025 23:57:12 +0100 |
| parents | 655f9e4bc6f2 |
| children | 48430941c18c |
| rev | line source |
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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"""A simple password generator to generate random passwords from selected |
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8 character repertoires. |
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9 |
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10 Use :command:`genpwd.py --help' for a detailed help message. |
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11 |
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12 """ |
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13 |
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14 from __future__ import (division, absolute_import, print_function) |
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15 |
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16 import argparse |
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17 import base64 |
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18 import binascii |
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19 import os |
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20 import sys |
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21 |
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22 from . import (__version__, __revision__) |
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23 |
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24 |
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25 # |
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26 # Unreserved characters according to RFC 1738 (URL) **and** RFC 3986 (URI) |
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27 # No general delimiters and no sub-delimiters. |
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28 # |
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29 WEB_CHARS = (b"ABCDEFGHIJKLMNOPQRSTUVWYXZabcdefghijklmnopqrstuvwxyz" |
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30 b"0123456789-._") |
| 246 | 31 # WEB_CHARS without visually similar characters (0O, 1lI) |
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32 SAFE_WEB_CHARS = (b"ABCDEFGHJKLMNPQRSTUVWYXZabcdefghijkmnopqrstuvwxyz" |
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33 b"23456789-._") |
| 246 | 34 # SAFE_WEB_CHARS with preference to punctuation |
| 35 SAFE_WEB_CHARS_2 = b".-_" + SAFE_WEB_CHARS | |
| 36 # Unreserved characters from URI but with sub-delims allowed | |
| 37 URI_CHARS = WEB_CHARS + b"~" + b"!$&'()*+,;=" | |
| 38 # URI_CHARS without visually similar characters | |
| 39 SAFE_URI_CHARS = SAFE_WEB_CHARS + b"~" + b"!$&'()*+,;=" | |
| 40 # Just like SAFE_URI_CHARS but prefers punctuation characters | |
| 41 SAFE_URI_CHARS_2 = (b"~" + b"!$&'()*+,;=" + SAFE_WEB_CHARS | |
| 42 + b"~" + b"!$&'()*+,;=") | |
| 43 # All visible characters from ASCII character set but no space | |
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44 FULL_ASCII = (b"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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45 b"abcdefghijklmnopqrstuvwxyz!#$%&/()*+-.,:;<=>?@^_`[\\]{|}'\"~") |
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46 # |
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47 # A safer variant of FULL_ASCII: |
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48 # - no characters that are visually similar (0O, 1lI) |
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49 # - no characters with dead keys on german keyboards |
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50 # - no backslash (too easily interpret as escape character |
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51 # - no single or double quotes |
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52 SAFE_ASCII = (b"23456789ABCDEFGHJKLMNPQRSTUVWXYZ" |
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53 b"abcdefghijkmnopqrstuvwxyz!#$%&/()*+-.,:;<=>?@_[]{|}~") |
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54 # just numeric and alphabetic |
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55 ALNUM = b"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" |
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56 # safer alpha-numberic without visually similar characters |
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57 SAFE_ALNUM = b"23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz" |
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58 |
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59 |
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60 PY2 = sys.version_info[0] <= 2 |
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61 |
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62 |
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63 def main(argv=None): |
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64 aparser = argparse.ArgumentParser( |
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65 description="A simple password generator for passwords with a given" |
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66 " length within a selected character repertoire", |
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67 fromfile_prefix_chars='@') |
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68 aparser.add_argument( |
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69 "-v", "--version", action="version", |
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70 version="%s (rv:%s)" % (__version__, __revision__)) |
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71 group = aparser.add_mutually_exclusive_group() |
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72 group.add_argument( |
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73 "--algorithm", "-a", |
| 246 | 74 choices=("web", "safe-web", "safe-web-2", |
| 75 "uri", "safe-uri", "safe-uri-2", | |
| 76 "ascii", "safe-ascii", | |
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77 "alnum", "safe-alnum", |
| 246 | 78 "bin-base64", "bin-urlsafe-base64", "bin-base32", "bin-hex", |
| 79 "bin-ascii85",), | |
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80 default="safe-ascii", |
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81 help=""" |
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82 Select an algorithm and (implicitly) a character repertoire. |
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83 All repertoires that start with `bin-' just encode the output of |
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84 "os.urandom()" with the selected encoder. |
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85 All repertoires that end with `-safe' or `safe-2' do not contain visually |
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86 similar characters (currently `0O' or `Il1'). |
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87 All repertoires that end with `-2' are variants with a bias to punctuation |
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88 characters. |
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89 This is incompatible with option `--repertoire'. |
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90 Default: safe-ascii""") |
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91 group.add_argument( |
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92 "--repertoire", "-r", |
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93 action="store", metavar="REPERTOIRE", |
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94 help=""" |
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95 Select from given character repertoire. |
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96 The repertoire must be characters from the ISO-8859-15 character set. |
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97 An empty REPERTOIRE selects implicitly the default algorithm. |
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98 This is incompatible with option `--algorithm'.""") |
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99 aparser.add_argument( |
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100 "-E", dest="use_bin_length", action="store_true", |
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101 help="For some repertoires make OUTPUT-LENGTH the number of bytes" |
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102 " that is to be read from random sources instead of output bytes") |
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103 aparser.add_argument( |
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104 "--group", "-G", action="store_true", |
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105 help="""Group the results. If no "--group-sep" or "--group-size" is |
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106 given use their respective defaults.""") |
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107 aparser.add_argument( |
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108 "--group-sep", action="store", default=None, metavar="GROUP-SEP", |
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109 help="""Group the result using GROUP-SEP as separator. |
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110 Option "--group" is implied. |
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111 Default when grouping is enabled is the SPACE character ` '.""") |
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112 aparser.add_argument( |
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113 "--group-size", action="store", type=int, default=None, |
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114 metavar="GROUP-SIZE", |
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115 help="""Group the result using a group size of GROUP-SIZE characters. |
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116 Option "--group" is implied. |
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117 Default when grouping is enabled is 6.""") |
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118 aparser.add_argument( |
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119 "req_length", metavar="OUTPUT-LENGTH", type=int, |
| 237 | 120 help="The required length of the generated output") |
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121 |
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122 opts = aparser.parse_args(args=argv) |
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123 |
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124 grouper = None |
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125 if opts.group or opts.group_sep is not None or opts.group_size is not None: |
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126 if opts.group_sep is None: |
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127 gsep = b' ' |
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128 else: |
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129 if PY2: |
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130 gsep = opts.group_sep |
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131 else: |
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132 gsep = opts.group_sep.encode("utf8") |
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133 gsize = 6 if opts.group_size is None else opts.group_size |
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134 grouper = make_grouper(sep=gsep, size=gsize) |
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135 |
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136 if opts.repertoire: |
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137 try: |
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138 repertoire = (opts.repertoire |
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139 if PY2 |
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140 else opts.repertoire.encode("iso-8859-15")) |
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141 except UnicodeError: |
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142 raise ValueError("non ISO-8859-15 character in given repertoire") |
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143 pwd = gen_from_repertoire(opts.req_length, repertoire, grouper=grouper) |
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144 elif opts.algorithm == "web": |
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145 pwd = gen_from_repertoire( |
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146 opts.req_length, WEB_CHARS, grouper=grouper) |
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147 elif opts.algorithm == "safe-web": |
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148 pwd = gen_from_repertoire( |
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149 opts.req_length, SAFE_WEB_CHARS, grouper=grouper) |
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150 elif opts.algorithm == "safe-web-2": |
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151 pwd = gen_from_repertoire( |
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152 opts.req_length, SAFE_WEB_CHARS_2, grouper=grouper) |
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153 elif opts.algorithm == "uri": |
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154 pwd = gen_from_repertoire( |
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155 opts.req_length, URI_CHARS, grouper=grouper) |
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156 elif opts.algorithm == "safe-uri": |
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157 pwd = gen_from_repertoire( |
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158 opts.req_length, SAFE_URI_CHARS, grouper=grouper) |
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159 elif opts.algorithm == "safe-uri-2": |
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160 pwd = gen_from_repertoire( |
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161 opts.req_length, SAFE_URI_CHARS_2, grouper=grouper) |
|
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162 elif opts.algorithm == "ascii": |
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163 pwd = gen_from_repertoire( |
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164 opts.req_length, FULL_ASCII, grouper=grouper) |
|
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165 elif opts.algorithm == "safe-ascii": |
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166 pwd = gen_from_repertoire( |
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167 opts.req_length, SAFE_ASCII, grouper=grouper) |
|
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168 elif opts.algorithm == "alnum": |
|
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169 pwd = gen_from_repertoire(opts.req_length, ALNUM, grouper=grouper) |
|
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170 elif opts.algorithm == "safe-alnum": |
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171 pwd = gen_from_repertoire( |
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172 opts.req_length, SAFE_ALNUM, grouper=grouper) |
|
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173 elif opts.algorithm == "bin-base64": |
|
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174 encoder = base64.b64encode |
|
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175 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder, |
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176 rstrip_chars=b"=", grouper=grouper) |
|
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177 elif opts.algorithm == "bin-urlsafe-base64": |
|
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178 encoder = base64.urlsafe_b64encode |
|
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179 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder, |
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180 rstrip_chars=b"=", grouper=grouper) |
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181 elif opts.algorithm == "bin-base32": |
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182 encoder = base64.b32encode |
|
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183 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder, |
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184 rstrip_chars=b"=", grouper=grouper) |
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185 elif opts.algorithm == "bin-ascii85": |
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186 encoder = base64.a85encode |
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187 pwd = gen_bin( |
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188 opts.req_length, opts.use_bin_length, encoder, grouper=grouper) |
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189 elif opts.algorithm == "bin-hex": |
|
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190 encoder = binascii.hexlify |
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191 pwd = gen_bin( |
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192 opts.req_length, opts.use_bin_length, encoder, grouper=grouper) |
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193 else: |
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194 raise NotImplementedError("algorithm not yet implemented: %s" |
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195 % opts.algorithm) |
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196 if opts.group or opts.group_size or opts.group_sep: |
|
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197 if len(pwd) < opts.req_length: |
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198 raise AssertionError("internal length mismatch") |
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199 else: |
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200 if opts.use_bin_length: |
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201 if len(pwd) < opts.req_length: |
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202 raise AssertionError("internal length mismatch") |
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203 else: |
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204 if len(pwd) != opts.req_length: |
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205 raise AssertionError("internal length mismatch") |
|
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206 if PY2: |
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207 print(pwd) |
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208 sys.stdout.flush() |
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209 else: |
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210 sys.stdout.buffer.write(pwd) |
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211 sys.stdout.buffer.write(b'\n') |
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212 sys.stdout.buffer.flush() |
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213 |
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214 |
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254
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215 def gen_from_repertoire(length, repertoire, grouper=None): |
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240
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216 """Select `length` characters randomly from given character repertoire |
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217 `repertoire`. |
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218 |
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219 """ |
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220 assert len(repertoire) <= 256 |
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221 pwd = [] |
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222 while len(pwd) < length: |
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238
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223 rndbytes = os.urandom(16) |
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224 for c in rndbytes: |
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225 if PY2: |
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226 c = ord(c) |
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227 if c < len(repertoire): |
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228 pwd.append(repertoire[c]) |
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229 if len(pwd) >= length: |
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230 break |
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231 if PY2: |
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232 pwd = b''.join(pwd) |
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233 else: |
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234 pwd = bytes(pwd) |
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254
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235 if grouper: |
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236 pwd = grouper(pwd) |
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237 return pwd |
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238 |
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239 |
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254
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240 def gen_bin(length, use_bin_length, encoder, rstrip_chars=None, grouper=None): |
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240
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241 """Generate from :func:`os.urandom` and just encode with given `encoder`. |
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242 |
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243 """ |
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244 pwd = encoder(os.urandom(length)) |
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245 pwd = pwd.rstrip(rstrip_chars) if use_bin_length else pwd[:length] |
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246 if grouper: |
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247 pwd = grouper(pwd) |
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248 return pwd |
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249 |
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250 |
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251 def make_grouper(sep=b' ', size=6): |
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252 |
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253 def _grouper(pwd): |
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254 if not pwd or size <= 0: |
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255 return pwd |
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256 assert isinstance(pwd, bytes) |
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257 groups = [] |
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258 idx = 0 |
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259 while idx < len(pwd): |
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260 groups.append(pwd[idx:idx+size]) |
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261 idx += size |
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262 return sep.join(groups) |
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263 |
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264 assert isinstance(sep, bytes) |
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265 return _grouper |
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227
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266 |
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267 |
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268 if __name__ == "__main__": |
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269 main() |