AWS IAM Python Boto3 script - Create User

Question

My Issue: I am trying to create an AWS CLI script using Python and the Boto3 library. I want the script to ask for inputs (username? programmatic access? attach to which Group? Change password on first login? etc.) and set up the user with those details.

My Attempt: I can create the user and give the user programmatic access or not. My problem lies with passing the selected Group ARN to the attach_group_policy PolicyARN='aws:aws:iam::aws:policy/xxxx

I feel a veriable suits here but cannot think how to do it. Hopefully my code below shows my problem better.


iam = boto3.resource('iam')
iam_keys = boto3.resource('iam')
group_list = boto3.client('iam')
attach_group = boto3.client('iam')

mail = raw_input("Please enter your e-mail address: ")
response = iam.create_user(UserName=mail)

prog = raw_input("Do you require programmatic access?(y/n): ") 
if prog == "y":
        iam_keys.create_access_key(UserName=mail)
        print("Make sure awscli is installed on your machine")
elif prog == "n":
        print("Console access only")


### it is this area downwards that things break/get confusing
list = group_list.list_groups(MaxItems=150)   ### works
for "GroupName" in list:                      ### works
        print(list)                           ### works; prints as large JSON, need to output just u' GroupName

float(input("Please pick a Group {}".format(attach)))

var = attach_group.attach_group_policy(GroupName=attach, PolicyArn='aws:aws:iam::aws:policy/xxxx')     ### Broke; need to fill in ARN somehow after forward slash

print(response, prog)

I want the selected Policy (selected by typing exact name of Group) to attach to the user.

Any help is greatly appreciated, I have very little Python knowledge nad have been following https://boto3.amazonaws.com/v1/documentation/api/latest/index.html

Thank you.

jarmod jarmod · Accepted Answer · 2019-06-19T13:31:17

Here is a Python 2 example of how to list IAM groups, allow the user to select one of them, and then use the ARN corresponding to the selected IAM group:

import boto3

iam = boto3.client('iam')

rsp = iam.list_groups()
groups = rsp['Groups']
print(groups)
index = 1

for group in groups:
  print("%d: %s" % (index, group["GroupName"]))
  index += 1

option = int(input("Please pick a group number: "))
arn = groups[option-1]["Arn"]
print("You selected group %d: %s" % (option, arn))

Or in Python3:

import boto3

iam = boto3.client('iam')

rsp = iam.list_groups()
groups = rsp['Groups']
index = 1

for group in groups:
    print(f'{index}: {group["GroupName"]}')
    index += 1

option = int(input("Please pick a group number: "))
arn = groups[option-1]["Arn"]
print(f'You selected group {option}: {arn}')

This will result in something like this:

1: admins
2: devops
3: programmers
Please pick a group number: 2
You selected option 2: arn:aws:iam::123456781234:group/devops

Note: you will need to add input validation around this, for example if the user types -3 or the letter A.

If, as I suspect, you actually need the user to select a policy by name so that you can retrieve the ARN for that policy (to attach to an IAM group), then you can do that as follows:

rsp = iam.list_policies(Scope='Local', OnlyAttached=False)
policies = rsp['Policies']
index = 1

for policy in policies:
    print("%d: %s" % (index, policy["PolicyName"]))
    index += 1

option = int(input("Please pick a policy number: "))
arn = policies[option-1]["Arn"]
print("You selected policy %d: %s" % (option, arn))

AWS IAM Python Boto3 script - Create User

1 Answers