Adding a python-verion

1 files changed, 318 insertions, 0 deletions

diff --git a/makepass.py b/makepass.py
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+#!/usr/bin/env python3
+#
+# Author  : Dennis Eriksen <d@ennis.no>
+# File    : makepass.py
+# Created : 2023-09-14
+# License : BSD-3-Clause
+#
+# Copyright (c) 2018-2023 Dennis Eriksen <d@ennis.no>
+
+import argparse
+import os
+import random
+import sys
+
+# Global variables
+
+MAX = 255
+RANGE_MAX = 42
+RANGE_MIN = 8
+PASS_WORDS = 8
+
+LOWER = "abcdefghijklmnopqrstuvwxyz"
+UPPER = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+DIGIT = "0123456789"
+OTHER = "!$%&#/()=?+-_,.;:<>[]{}|@*"
+
+ALPHA = LOWER + UPPER
+ALNUM = ALPHA + DIGIT
+EVERY = ALNUM + OTHER
+
+NORMAL = ALNUM + "_-"
+SPECIAL = EVERY
+
+DEFAULT_LENGTH = 0
+DEFAULT_NUMBER = 10
+DEFAULT_WORDLIST = "/usr/share/dict/words"
+
+
+class CommonPrintData:
+    def __init__(self, length, printbool, printlen, col_width, col_num):
+        self.length = length
+        self.printbool = printbool
+        self.printlen = printlen
+        self.col_num = col_num
+        self.col_width = col_width
+
+
+#
+# Main function
+#
+def main():
+    normal = os.getenv("MAKEPASS_NORMAL") or NORMAL
+    special = os.getenv("MAKEPASS_SPECIAL") or SPECIAL
+    wordlist_file = os.getenv("MAKEPASS_WORDLIST") or DEFAULT_WORDLIST
+
+    # Initialize parser
+    parser = argparse.ArgumentParser(
+        description="Process some strings.", add_help=False
+    )
+
+    # Add arguments
+    parser.add_argument("-h", "--help", action="store_true")
+    parser.add_argument("-l", "--length", type=int, help="Length of strings")
+    parser.add_argument("-n", "--number", type=int, help="Number of strings")
+    parser.add_argument("-p", "--printlen", action="store_true")
+    parser.add_argument("arg_length", type=int, nargs="?")
+
+    # Parse arguments
+    args = parser.parse_args()
+
+    if args.help:
+        usage()
+
+    # Some error-checking
+    # length
+    try:
+        # env or default
+        length = int(os.getenv("MAKEPASS_LENGTH") or DEFAULT_LENGTH)
+
+        # -l flag
+        if args.length is not None:
+            if args.length < 0 or MAX < args.length:
+                raise ValueError("-l")
+            length = args.length
+
+        # solo argument
+        if args.arg_length is not None:
+            length = args.arg_length
+
+        # check result
+        if length < 0 or MAX < length:
+            raise ValueError("length")
+    except ValueError as e:
+        print(f"{e} must be a number between 0 and {MAX}")
+        sys.exit(1)
+
+    # number
+    try:
+        # env or default
+        number = int(os.getenv("MAKEPASS_NUMBER") or DEFAULT_NUMBER)
+
+        # -n flag
+        if args.number is not None:
+            if args.number < 1 or MAX < args.number:
+                raise ValueError("-n")
+            number = args.number
+
+        # check result
+        if number < 1 or MAX < number:
+            raise ValueError("number")
+    except ValueError as e:
+        print(f"{e} must be a number between 1 and {MAX}")
+        sys.exit(1)
+
+    # Set some other stuff
+
+    printbool = args.printlen
+    if printbool:
+        printlen = 3 if length < 100 else 4
+    else:
+        printlen = 0
+
+    # get terminal width
+    try:
+        xwidth = os.get_terminal_size().columns
+    except Exception as _:
+        xwidth = 1
+
+    # get width of columns to print
+    if length == 0:
+        col_width = RANGE_MAX + 2
+    else:
+        col_width = length + 2
+
+    # number of columns to print
+    col_num = int(xwidth / (col_width + printlen))
+    if col_num == 0:
+        col_num = 1
+
+    # config
+    config = CommonPrintData(
+        length=length,
+        printbool=printbool,
+        printlen=printlen,
+        col_width=col_width,
+        col_num=col_num,
+    )
+
+    #
+    # print passwords
+    #
+
+    # Generate and print normal and special passwords
+    print_columns("Normal passwords", number, normal, config)
+
+    print()
+
+    print_columns(
+        "Passwords with special characters", int(number / 3 * 2 + 1), special, config
+    )
+
+    # Generate and print passphrases if wordlist exists
+    if os.path.isfile(wordlist_file):
+        print()
+
+        print("Generating passphrases: ")
+        passphrase(int(number / 2), wordlist_file)
+
+
+#
+# Print passwords in neat columns
+#
+def print_columns(title: str, num: int, chars: str, c: CommonPrintData):
+    # Generate random strings
+    strings = [randstring(c.length, chars) for _ in range(num)]
+
+    print(f"{title}:")
+
+    for i in range(num):
+        # Print the length of the string if printlen is set
+        if c.printbool:
+            print(f"{len(strings[i]):0{c.printlen-1}}", end=" ")
+
+        # Print the string, left justified based on column width
+        print(f"{strings[i]:<{c.col_width}}", end="")
+
+        # If we have printed enough strings for a single line or the
+        # rest of strings are fewer than column number, we break lines.
+        i += 1
+        if i % c.col_num == 0 or (i == num and i % c.col_num > 0):
+            print()
+
+
+#
+# Generate random strings that can work as passwords
+#
+def randstring(length, chars):
+    """
+    Generate a random password of the specified length. Use special
+    characters if special_chars option is True.
+    """
+    if length == 0:
+        length = random.randint(RANGE_MIN, RANGE_MAX)
+
+    password = []
+    password.append(random.choice(ALPHA))
+    for i in range(length - 2):
+        password.append(random.choice(chars))
+    password.append(random.choice(ALNUM))
+
+    # Randomly reorder the characters
+    return "".join(password)
+
+
+#
+# Passphrases!
+#
+def passphrase(number, file_name):
+    """
+    Generate a number of random passphrases from the wordlist.
+    """
+    try:
+        with open(file_name, "r") as f:
+            lines = f.read().splitlines()
+    except IOError:
+        print(f"Cannot open file: {file_name}")
+        sys.exit(1)
+
+    for i in range(number):
+        word_list = random.choices(lines, k=5)
+        passphrase = "-".join(word_list)
+        print(passphrase)
+
+
+def usage():
+    text = """NAME
+    makepass - create several random passwords
+
+SYNOPSIS
+    makepass [OPTIONS] [NUM]
+
+    If a NUM is provided, passwords will be NUM characters long.
+
+    By default `makepass` will output passwords from the three following classes:
+
+    - Normal passwords - random strings with letters (both lower and upper
+      case), numbers, and dashes and underscores.
+
+    - Passwords with special characters - random strings generated from lower
+      and upper case letters, numbers, and the following characters:
+      !#$%&/()=?+-_,.;:<>[]{}|@*
+
+    - Passphrases - if we find a dictionary, a series of eight random words
+      from the dictionary, separated by dashes. The number of words can not be
+      changed, but you do not have to use all of them. Use as mane as you want.
+
+    The first character will always be alphabetic, and the last will always be
+    alphanumeric.
+
+DESCRIPTION
+    makepass has the following options:
+
+    -h
+        output this help-text
+    -l
+        length of passwords. See MAKEPASS_LENGTH below
+    -n
+        number of passwords. See MAKEPASS_NUMBER below
+    -p
+        print length of number
+
+ENVIRONMENT
+    makepass examines the following environmental variables.
+
+    MAKEPASS_LENGTH
+        Specifies the length of passwords. Valid values are 0-255. If 0, a
+        random value between 8 and 42 will be used for each password. -l
+        overrides this environmental variable, and the argument NUM overrides
+        that again. So `MAKEPASS_LENGTH=10 makepass -l 12 14` will give
+        passwords that are 14 characters long, even though both -l and
+        MAKEPASS_LENGTH also specifies a length.
+
+    MAKEPASS_NUMBER
+        The number of passwords to generate. This formula is used to determine
+        how many passwords from each group should be generated:
+        - (n) normal passwords
+        - (n / 3 * 2 + 1) special passwords
+        - (n / 2) passphrases
+        Where n is 10 by default. Valid values for n are 1-255. Floating-poing
+        math is not used, so results may vary.
+
+    MAKEPASS_PRINTLEN
+        If 1, print length of all passwords. If 0, don\'t.
+
+    MAKEPASS_NORMAL
+        String of characters from which to generate "normal" passwords.
+        Defaults to:
+        abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_
+
+    MAKEPASS_SPECIAL
+        String of characters from which to generate passwords with special
+        characters. Defaults to the same characters as in MAKEPASS_NORMAL, plus
+        these:
+        !#$%&/()=?+-_,.;:<>[]{}|@*
+
+    MAKEPASS_WORDLIST
+        Specifies the dictionary we find words for passphrases in. If this is
+        unset or empty, we try "/usr/share/dict/words". If that file does not
+        exist, no passphrases will be provided.
+
+AUTHOR
+    Dennis Eriksen <https://dnns.no>"""
+    print(text)
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()