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awsmfalogin.py
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awsmfalogin.py
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# -*- coding: utf8 -*-
# __version__ = '1.0'
from __future__ import print_function
import boto3
import botocore
import logging
import argparse
import os
import shutil
import re
logfile = os.path.realpath(os.path.join(os.path.dirname(__file__), os.path.expanduser("~/.aws/mfa-token.log")))
logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s", filename=logfile)
logger = logging.getLogger("main")
AWS_CONFIG_PATH = '%s/.aws/config' % (os.path.expanduser('~'),)
AWS_CREDS_PATH = '%s/.aws/credentials' % (os.path.expanduser('~'),)
DURATION_SECONDS = 43200
def autoload_aws(profile, service):
"""
Make connection to particular AWS service
:param profile: string
:param service: string
:return: object representing connection to aws service
"""
try:
aws_session = boto3.Session(profile_name=profile)
aws_client = aws_session.client(service)
return aws_client
except Exception as e:
logging.exception(e)
def backup_aws_creds_files():
"""
Backup local AWS creds files
:return: none
"""
shutil.copy(AWS_CONFIG_PATH, AWS_CONFIG_PATH + ".bkp")
shutil.copy(AWS_CREDS_PATH, AWS_CREDS_PATH + ".bkp")
def get_aws_local_file(aws_creds_file):
"""
Converting aws config and credentials files into dictionaries
:param aws_creds_file: string
:return: dictionary
"""
aws_config = {}
current_profile = ''
input_file = open(aws_creds_file, 'r')
for line in input_file.readlines():
# print line
if re.match('^\[', line):
current_profile = line.strip()[1:-1]
aws_config[current_profile] = {}
if re.match('\w', line):
key, val = line.split('=')
aws_config[current_profile][key.strip()] = val.strip()
input_file.close()
return aws_config
def get_profiles_names(profiles):
"""
AWS profiles selection for STS token generation
:param profiles: list
:return: list
"""
print("Parse AWS credentials in " + AWS_CREDS_PATH + "\n")
input_profile = "\nPlease select option from above for temp credentials generation."
profiles_wo_mfa = [prof for prof in profiles if not re.match('^mfa-', prof)]
input_profile += "\nType integer, integers with space or 'all' from [0 to " + str(len(profiles_wo_mfa) - 1) + "]: "
chosen_profile_status = False
selected_profiles = []
while not chosen_profile_status:
print("\nList of all found configured AWS profiles in provided config file:")
for profile in profiles_wo_mfa:
print('\t\t' + str(profiles_wo_mfa.index(profile)) + ") " + profile)
print("\n\t\tall) Or type 'all' for all profiles ...")
option_input = raw_input(input_profile)
try:
if not option_input.strip().lower() == 'all' and re.match('\S+', option_input):
options = re.findall(r"\d+", option_input)
for option in options:
if re.match('\d', option) and int(option) in range(len(profiles_wo_mfa)):
selected_profiles.append(profiles_wo_mfa[int(option)])
return selected_profiles
elif option_input.strip().lower() == 'all':
return profiles_wo_mfa
else:
print("ERROR. Please select correct option")
except ValueError:
print("ERROR. You have asked to use Integer symbols. Try again...")
def get_mfa_arn(profiles):
"""
Get MFA ARN (Serial number) for selected local AWS profiles
:param profiles: string
:return: dictionary
"""
profile_mfa_arn = {}
for profile in profiles:
iam_client = autoload_aws(profile, 'iam')
try:
response = iam_client.get_user()
user_mfa_device = iam_client.list_mfa_devices(UserName=response['User']['UserName'])['MFADevices']
if user_mfa_device:
profile_mfa_arn[profile] = user_mfa_device[0]['SerialNumber']
else:
print("\nERROR. Your account has not Virtual MFA device. Create Virtual device or use another account.")
quit(0)
except botocore.exceptions.NoCredentialsError:
print("\nERROR. Can't find your credentials. Please check credentials config file.")
quit(0)
return profile_mfa_arn
def get_session_token(profiles, mfa_arn):
"""
Getting STS session token with temp credentials for 12 hours
:param profiles: list
:param mfa_arn: dictionary
:return: string
"""
profiles_sts_tokens = {}
for profile in profiles:
profiles_sts_tokens[profile] = {}
sts_client = autoload_aws(profile, 'sts')
token_code_status = False
print("\nYou have selected AWS profile: " + profile)
input_token_code = "Provide token-code from your MFA device: "
while not token_code_status:
token_code = raw_input(input_token_code)
try:
if re.match('^\d{6}$', token_code):
response = sts_client.get_session_token(DurationSeconds=DURATION_SECONDS,
SerialNumber=mfa_arn[profile],
TokenCode=token_code)
print("Session token has been successfully generated for [profile: " + profile + "]")
profiles_sts_tokens[profile]['aws_access_key_id'] = response['Credentials']['AccessKeyId']
profiles_sts_tokens[profile]['aws_secret_access_key'] = response['Credentials']['SecretAccessKey']
profiles_sts_tokens[profile]['aws_session_token'] = response['Credentials']['SessionToken']
profiles_sts_tokens[profile]['aws_security_token'] = response['Credentials']['SessionToken']
token_code_status = True
else:
print("Please provide 6 integers from your Virtual MFA device")
except Exception as e:
logging.exception(e)
print("Access denied! Seems you provided wrong Token code or its expired. Try again...")
return profiles_sts_tokens
def update_aws_creds_files(profiles_config, path_to_file):
"""
Store all new Session tokens locally
:param profiles_config:
:param path_to_file:
:return: none
"""
file_update = open(path_to_file, 'w')
final = ''
for profile in sorted(profiles_config.keys()):
final += '[' + profile + ']\n'
content = profiles_config[profile]
for val in sorted(content.keys()):
final += val + ' = ' + content[val] + '\n'
final += '\n'
# print(final)
file_update.write(final)
file_update.close()
def main():
"""
Main func
:return: none
"""
parser = argparse.ArgumentParser(
description='Get MFA token for 2FA AWS API auth '
)
parser.add_argument(
'-silent',
'--silent',
dest='silent',
default=None,
required=None,
help='Specify this arg if you want to use this script for automation'
)
parser.add_argument(
'-profile',
'--profile',
dest='profile',
default=None,
required=None,
help='Specify profile for AWS credentials in local aws config file'
)
# Parse arguments
args = parser.parse_args()
if args.silent and args.profile:
pass
else:
backup_aws_creds_files()
aws_config_profile = get_aws_local_file(AWS_CONFIG_PATH)
aws_creds_profile = get_aws_local_file(AWS_CREDS_PATH)
aws_profiles = get_profiles_names(aws_creds_profile.keys())
aws_mfa_arn = get_mfa_arn(aws_profiles)
sts_creds = get_session_token(aws_profiles, aws_mfa_arn)
for profile in aws_profiles:
sts_profile = 'mfa-' + profile
if profile in aws_config_profile.keys():
aws_config_profile['profile ' + sts_profile] = aws_config_profile[profile].copy()
else:
aws_config_profile['profile ' + sts_profile] = aws_config_profile['profile ' + profile].copy()
aws_creds_profile[sts_profile] = sts_creds[profile].copy()
# Save credentials into local AWS config and creds files
if aws_config_profile and aws_creds_profile:
update_aws_creds_files(aws_config_profile, AWS_CONFIG_PATH)
update_aws_creds_files(aws_creds_profile, AWS_CREDS_PATH)
print("SUCCESS. Credentials were stored to local AWS creds files. Note: new aws config profile start with mfa-")
if __name__ == '__main__':
main()