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73 lines
2.4 KiB
Bash
73 lines
2.4 KiB
Bash
#!/bin/bash
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#
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# This script simply calls `aws sts assume-role` using hardcoded parameters, in order
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# to retrieve set of session credentials and reformat it into ~/.aws/credentials file format.
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#
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# Mariusz B., mgeeky '19
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#
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#
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# --------------------------
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# Configure below variables.
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#
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# This profile name must be different among any other profiles oyu have defined in your
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# config and credentials file.
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PROFILE_NAME=your-profile-name
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ROLE_NAME=Your_Role_Name
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ROLE_ARN=arn:aws:iam::<NUMBER>:role/$ROLE_NAME
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# If you leave this field empty - it will be deduced from `aws sts get-caller-identity` output
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#SERIAL_MFA=arn:aws:iam::<NUMBER>:mfa/<USER-NAME>
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SERIAL_MFA=
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# Duration in seconds. Values possible range: 900-43200
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# 1 hour - 3600, 2 hours - 7200, 3 hours - 10800, 6 hours - 21600, 12 hours - 43200
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DURATION=42000
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#
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# --------------------------
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#
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# Some times assume-role may return with an Access-Denied if there were no account authenticated
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# regular commands sent first.
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out=$(aws sts get-caller-identity)
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if [ $? -ne 0 ]; then
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echo "[!] Could not get caller's identity: "
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echo "$out"
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exit 1
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fi
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if [[ "$SERIAL_MFA" = "" ]]; then
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SERIAL_MFA=$(echo "$out" | python -c "import sys,json; foo=json.loads(sys.stdin.read()); print('arn:aws:iam::{}:mfa/{}'.format(foo['Account'], foo['Arn'].split('/')[1]))" )
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fi
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read -p "Type your AWS MFA Code: " code
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echo
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out=$(aws sts assume-role --serial-number $SERIAL_MFA --role-arn $ROLE_ARN --role-session-name $ROLE_NAME --duration-seconds $DURATION --token-code $code 2>&1)
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if [ $? -eq 0 ]; then
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valid=$(printf '%dh:%dm:%ds\n' $(($DURATION/3600)) $(($DURATION%3600/60)) $(($DURATION%60)))
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echo "[+] Collected session credentials. They will be valid for: $valid. "
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echo -e "\tPaste below lines to your '~/.aws/credentials' file:"
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echo
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echo "[$PROFILE_NAME]"
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echo "$out" | python3 -c 'import sys,json; foo=json.loads(sys.stdin.read()); print("aws_access_key_id={}\naws_secret_access_key={}\naws_session_token={}".format(foo["Credentials"]["AccessKeyId"],foo["Credentials"]["SecretAccessKey"],foo["Credentials"]["SessionToken"]))'
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echo
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else
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echo "[!] Could not obtain assume-role session credentials:"
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echo "$out"
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echo
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out2=$(env | grep -E 'AWS_[^=]+')
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if [[ "$out2" != "" ]]; then
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echo "[!] Your command could fail because of pre-set AWS-related environment variables."
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echo -e "\tPlease review them, correct any problems and re-launch that script."
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echo
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echo "$out2"
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echo
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fi
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exit 1
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fi
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