/usr/lib/python2.7/getpass.py is in libpython2.7-stdlib 2.7.11-7ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | """Utilities to get a password and/or the current user name.
getpass(prompt[, stream]) - Prompt for a password, with echo turned off.
getuser() - Get the user name from the environment or password database.
GetPassWarning - This UserWarning is issued when getpass() cannot prevent
echoing of the password contents while reading.
On Windows, the msvcrt module will be used.
On the Mac EasyDialogs.AskPassword is used, if available.
"""
# Authors: Piers Lauder (original)
# Guido van Rossum (Windows support and cleanup)
# Gregory P. Smith (tty support & GetPassWarning)
import os, sys, warnings
__all__ = ["getpass","getuser","GetPassWarning"]
class GetPassWarning(UserWarning): pass
def unix_getpass(prompt='Password: ', stream=None):
"""Prompt for a password, with echo turned off.
Args:
prompt: Written on stream to ask for the input. Default: 'Password: '
stream: A writable file object to display the prompt. Defaults to
the tty. If no tty is available defaults to sys.stderr.
Returns:
The seKr3t input.
Raises:
EOFError: If our input tty or stdin was closed.
GetPassWarning: When we were unable to turn echo off on the input.
Always restores terminal settings before returning.
"""
fd = None
tty = None
try:
# Always try reading and writing directly on the tty first.
fd = os.open('/dev/tty', os.O_RDWR|os.O_NOCTTY)
tty = os.fdopen(fd, 'w+', 1)
input = tty
if not stream:
stream = tty
except EnvironmentError, e:
# If that fails, see if stdin can be controlled.
try:
fd = sys.stdin.fileno()
except (AttributeError, ValueError):
passwd = fallback_getpass(prompt, stream)
input = sys.stdin
if not stream:
stream = sys.stderr
if fd is not None:
passwd = None
try:
old = termios.tcgetattr(fd) # a copy to save
new = old[:]
new[3] &= ~termios.ECHO # 3 == 'lflags'
tcsetattr_flags = termios.TCSAFLUSH
if hasattr(termios, 'TCSASOFT'):
tcsetattr_flags |= termios.TCSASOFT
try:
termios.tcsetattr(fd, tcsetattr_flags, new)
passwd = _raw_input(prompt, stream, input=input)
finally:
termios.tcsetattr(fd, tcsetattr_flags, old)
stream.flush() # issue7208
except termios.error, e:
if passwd is not None:
# _raw_input succeeded. The final tcsetattr failed. Reraise
# instead of leaving the terminal in an unknown state.
raise
# We can't control the tty or stdin. Give up and use normal IO.
# fallback_getpass() raises an appropriate warning.
del input, tty # clean up unused file objects before blocking
passwd = fallback_getpass(prompt, stream)
stream.write('\n')
return passwd
def win_getpass(prompt='Password: ', stream=None):
"""Prompt for password with echo off, using Windows getch()."""
if sys.stdin is not sys.__stdin__:
return fallback_getpass(prompt, stream)
import msvcrt
for c in prompt:
msvcrt.putch(c)
pw = ""
while 1:
c = msvcrt.getch()
if c == '\r' or c == '\n':
break
if c == '\003':
raise KeyboardInterrupt
if c == '\b':
pw = pw[:-1]
else:
pw = pw + c
msvcrt.putch('\r')
msvcrt.putch('\n')
return pw
def fallback_getpass(prompt='Password: ', stream=None):
warnings.warn("Can not control echo on the terminal.", GetPassWarning,
stacklevel=2)
if not stream:
stream = sys.stderr
print >>stream, "Warning: Password input may be echoed."
return _raw_input(prompt, stream)
def _raw_input(prompt="", stream=None, input=None):
# A raw_input() replacement that doesn't save the string in the
# GNU readline history.
if not stream:
stream = sys.stderr
if not input:
input = sys.stdin
prompt = str(prompt)
if prompt:
stream.write(prompt)
stream.flush()
# NOTE: The Python C API calls flockfile() (and unlock) during readline.
line = input.readline()
if not line:
raise EOFError
if line[-1] == '\n':
line = line[:-1]
return line
def getuser():
"""Get the username from the environment or password database.
First try various environment variables, then the password
database. This works on Windows as long as USERNAME is set.
"""
import os
for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
user = os.environ.get(name)
if user:
return user
# If this fails, the exception will "explain" why
import pwd
return pwd.getpwuid(os.getuid())[0]
# Bind the name getpass to the appropriate function
try:
import termios
# it's possible there is an incompatible termios from the
# McMillan Installer, make sure we have a UNIX-compatible termios
termios.tcgetattr, termios.tcsetattr
except (ImportError, AttributeError):
try:
import msvcrt
except ImportError:
try:
from EasyDialogs import AskPassword
except ImportError:
getpass = fallback_getpass
else:
getpass = AskPassword
else:
getpass = win_getpass
else:
getpass = unix_getpass
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