Mercurial > cpython-lru_cache-weakref

annotate Lib/getpass.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 88a8def58007
children 5925900edf16 77b96a5424a2
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91ecda9d5245 Another new utility: getpass() prompts for a password, with echo off.
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1 """Utilities to get a password and/or the current user name.
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2
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3 getpass(prompt[, stream]) - Prompt for a password, with echo turned off.
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4 getuser() - Get the user name from the environment or password database.
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5
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6 GetPassWarning - This UserWarning is issued when getpass() cannot prevent
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7 echoing of the password contents while reading.
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8
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9 On Windows, the msvcrt module will be used.
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10 On the Mac EasyDialogs.AskPassword is used, if available.
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11
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12 """
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13
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14 # Authors: Piers Lauder (original)
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15 # Guido van Rossum (Windows support and cleanup)
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16 # Gregory P. Smith (tty support & GetPassWarning)
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17
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18 import os, sys, warnings
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19
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20 __all__ = ["getpass","getuser","GetPassWarning"]
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21
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22
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23 class GetPassWarning(UserWarning): pass
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24
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25
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26 def unix_getpass(prompt='Password: ', stream=None):
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27 """Prompt for a password, with echo turned off.
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28
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29 Args:
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30 prompt: Written on stream to ask for the input. Default: 'Password: '
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31 stream: A writable file object to display the prompt. Defaults to
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32 the tty. If no tty is available defaults to sys.stderr.
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33 Returns:
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34 The seKr3t input.
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35 Raises:
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36 EOFError: If our input tty or stdin was closed.
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37 GetPassWarning: When we were unable to turn echo off on the input.
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38
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39 Always restores terminal settings before returning.
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40 """
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41 fd = None
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42 tty = None
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43 try:
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44 # Always try reading and writing directly on the tty first.
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45 fd = os.open('/dev/tty', os.O_RDWR|os.O_NOCTTY)
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46 tty = os.fdopen(fd, 'w+', 1)
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47 input = tty
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48 if not stream:
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49 stream = tty
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50 except EnvironmentError, e:
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51 # If that fails, see if stdin can be controlled.
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52 try:
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53 fd = sys.stdin.fileno()
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54 except:
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55 passwd = fallback_getpass(prompt, stream)
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56 input = sys.stdin
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57 if not stream:
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58 stream = sys.stderr
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59
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60 if fd is not None:
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61 passwd = None
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62 try:
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63 old = termios.tcgetattr(fd) # a copy to save
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64 new = old[:]
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65 new[3] &= ~termios.ECHO # 3 == 'lflags'
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66 try:
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67 termios.tcsetattr(fd, termios.TCSADRAIN, new)
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68 passwd = _raw_input(prompt, stream, input=input)
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69 finally:
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70 termios.tcsetattr(fd, termios.TCSADRAIN, old)
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71 except termios.error, e:
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72 if passwd is not None:
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73 # _raw_input succeeded. The final tcsetattr failed. Reraise
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74 # instead of leaving the terminal in an unknown state.
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75 raise
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76 # We can't control the tty or stdin. Give up and use normal IO.
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77 # fallback_getpass() raises an appropriate warning.
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78 del input, tty # clean up unused file objects before blocking
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79 passwd = fallback_getpass(prompt, stream)
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80
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81 stream.write('\n')
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82 return passwd
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83
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84
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85 def win_getpass(prompt='Password: ', stream=None):
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86 """Prompt for password with echo off, using Windows getch()."""
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87 if sys.stdin is not sys.__stdin__:
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88 return fallback_getpass(prompt, stream)
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89 import msvcrt
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90 for c in prompt:
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91 msvcrt.putch(c)
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92 pw = ""
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93 while 1:
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94 c = msvcrt.getch()
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95 if c == '\r' or c == '\n':
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96 break
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97 if c == '\003':
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98 raise KeyboardInterrupt
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99 if c == '\b':
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100 pw = pw[:-1]
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101 else:
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102 pw = pw + c
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103 msvcrt.putch('\r')
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104 msvcrt.putch('\n')
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105 return pw
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106
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107
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108 def fallback_getpass(prompt='Password: ', stream=None):
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109 warnings.warn("Can not control echo on the terminal.", GetPassWarning,
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110 stacklevel=2)
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111 if not stream:
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112 stream = sys.stderr
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113 print >>stream, "Warning: Password input may be echoed."
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114 return _raw_input(prompt, stream)
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115
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116
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117 def _raw_input(prompt="", stream=None, input=None):
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118 # A raw_input() replacement that doesn't save the string in the
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119 # GNU readline history.
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120 if not stream:
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121 stream = sys.stderr
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122 if not input:
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123 input = sys.stdin
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124 prompt = str(prompt)
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125 if prompt:
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126 stream.write(prompt)
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127 stream.flush()
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128 line = input.readline()
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129 if not line:
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130 raise EOFError
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131 if line[-1] == '\n':
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132 line = line[:-1]
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133 return line
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134
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135
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136 def getuser():
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137 """Get the username from the environment or password database.
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138
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139 First try various environment variables, then the password
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140 database. This works on Windows as long as USERNAME is set.
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141
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142 """
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143
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144 import os
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145
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146 for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
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147 user = os.environ.get(name)
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148 if user:
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149 return user
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150
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151 # If this fails, the exception will "explain" why
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
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152 import pwd
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Tim Peters <tim.peters@gmail.com>
parents: 11870
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153 return pwd.getpwuid(os.getuid())[0]
11389
895102eea485 print a warning if the password will be echoed.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 10142
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154
895102eea485 print a warning if the password will be echoed.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 10142
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155 # Bind the name getpass to the appropriate function
895102eea485 print a warning if the password will be echoed.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 10142
diff changeset
156 try:
16807
74fd1959cf44 Get the needed constants from termios, not TERMIOS.
Fred Drake <fdrake@acm.org>
parents: 16072
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157 import termios
26308
403dcbc9043f Fix SF #640094, on win32 getpass runs into unix_getpass
Neal Norwitz <nnorwitz@gmail.com>
parents: 19606
diff changeset
158 # it's possible there is an incompatible termios from the
403dcbc9043f Fix SF #640094, on win32 getpass runs into unix_getpass
Neal Norwitz <nnorwitz@gmail.com>
parents: 19606
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159 # McMillan Installer, make sure we have a UNIX-compatible termios
403dcbc9043f Fix SF #640094, on win32 getpass runs into unix_getpass
Neal Norwitz <nnorwitz@gmail.com>
parents: 19606
diff changeset
160 termios.tcgetattr, termios.tcsetattr
403dcbc9043f Fix SF #640094, on win32 getpass runs into unix_getpass
Neal Norwitz <nnorwitz@gmail.com>
parents: 19606
diff changeset
161 except (ImportError, AttributeError):
15868
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
162 try:
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
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163 import msvcrt
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
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164 except ImportError:
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
165 try:
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
166 from EasyDialogs import AskPassword
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
167 except ImportError:
46531
88a8def58007 Major improvements:
Gregory P. Smith <greg@mad-scientist.com>
parents: 46523
diff changeset
168 getpass = fallback_getpass
15868
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
169 else:
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
170 getpass = AskPassword
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
171 else:
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
172 getpass = win_getpass
11389
895102eea485 print a warning if the password will be echoed.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 10142
diff changeset
173 else:
15868
3060cbfa01be Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 11870
diff changeset
174 getpass = unix_getpass