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103 lines
3.4 KiB
Bash
103 lines
3.4 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 '19-20
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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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# Below two values are REQUIRED
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PROFILE_NAME=default
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ROLE_NAME=
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# Printed output role name
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OUTPUT_ROLE_NAME=
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# If left empty, will be deduced from `aws sts get-caller-identity` output.
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ACCOUNT_NUMBER=
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# If left empty, will use ROLE_NAME
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SESSION_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=3600
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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 --profile $PROFILE_NAME sts get-caller-identity)
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if [ $? -ne 0 ]; then
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>&2 echo "[!] Could not get caller's identity: "
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>&2 echo "$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 "$out" | python3 -c "import sys,json; foo=json.loads(sys.stdin.read()); print('arn:aws:iam::{}:mfa/{}'.format(foo['Account'], foo['Arn'].split('/')[1]))" )
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fi
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if [[ "$ACCOUNT_NUMBER" = "" ]]; then
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ACCOUNT_NUMBER=$(echo "$out" | python3 -c "import sys,json; foo=json.loads(sys.stdin.read()); print(foo['Account'])" )
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fi
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if [[ "$SESSION_NAME" = "" ]]; then
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SESSION_NAME=$ROLE_NAME
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fi
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ROLE_ARN=arn:aws:iam::$ACCOUNT_NUMBER:role/$ROLE_NAME
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>&2 echo "[.] Using Role ARN: $ROLE_ARN"
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code=""
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if [[ "$code" = "" ]] || [[ "$SERIAL_MFA" == "" ]]; then
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>&2 echo "[.] MFA not provided, will attempt to assume role without it."
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out=$(aws --profile $PROFILE_NAME sts assume-role --role-arn $ROLE_ARN --role-session-name $SESSION_NAME --duration-seconds $DURATION 2>&1)
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else
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>&2 echo "[.] Will attempt to assume role with MFA provided."
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out=$(aws --profile $PROFILE_NAME sts assume-role --serial-number $SERIAL_MFA --role-arn $ROLE_ARN --role-session-name $ROLE_NAME --duration-seconds $DURATION --token-code $code 2>&1)
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fi
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rolename=$PROFILE_NAME-$SESSION_NAME
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if [[ "$OUTPUT_ROLE_NAME" != "" ]]; then
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rolename=$OUTPUT_ROLE_NAME
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fi
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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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>&2 echo "[+] Collected session credentials. They will be valid for: $valid. "
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>&2 echo -e "\tPaste below lines to your '~/.aws/credentials' file:"
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echo
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echo "[$rolename]"
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echo "$out" | python3 -c 'import sys,json; foo=json.loads(sys.stdin.read()); print("aws_access_key_id={}\naws_secret_access_key={}\naws_session_token={}".format(foo["Credentials"]["AccessKeyId"],foo["Credentials"]["SecretAccessKey"],foo["Credentials"]["SessionToken"]))'
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>&2 echo
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else
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>&2 echo "[!] Could not obtain assume-role session credentials:"
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>&2 echo "$out"
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>&2 echo
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out2=$(env | grep -E 'AWS_[^=]+')
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if [[ "$out2" != "" ]]; then
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>&2 echo "[!] Your command could fail because of pre-set AWS-related environment variables."
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>&2 echo -e "\tPlease review them, correct any problems and re-launch that script."
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>&2 echo
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>&2 echo "$out2"
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>&2 echo
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fi
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exit 1
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fi
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