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Fix MFA device filtering #2

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Fix MFA device filtering #2

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -77,4 +77,4 @@ This project is licensed under the MIT License - see the [LICENSE](LICENSE) file

## Acknowledgments

This script automates the process described in the AWS Knowledge Center article [How do I use an MFA token to authenticate access to my AWS resources through the AWS CLI?](https://repost.aws/knowledge-center/authenticate-mfa-cli). It aims to simplify the steps outlined in the official documentation for a more streamlined user experience.
This script automates the process described in the AWS Knowledge Center article [How do I use an MFA token to authenticate access to my AWS resources through the AWS CLI?](https://repost.aws/knowledge-center/authenticate-mfa-cli). It aims to simplify the steps outlined in the official documentation for a more streamlined user experience.
8 changes: 5 additions & 3 deletions aws-mfa-auth.ps1
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Expand Up @@ -26,8 +26,10 @@ $aws_profile = Read-Input -prompt "Enter your AWS profile name (Default: default
Write-Host "Fetching MFA devices..."
$mfa_devices = aws iam list-mfa-devices --profile $aws_profile --output json | ConvertFrom-Json

# Filter out U2F devices
$mfa_devices = $mfa_devices.MFADevices | Where-Object { $_.SerialNumber -match "^arn:aws:iam::\d+:mfa/" }
# Filter out U2F devices by ensuring the ARN only contains a single segment after
# "mfa/". U2F devices include additional path segments that prevent CLI MFA
# authentication.
$mfa_devices = $mfa_devices.MFADevices | Where-Object { $_.SerialNumber -match "^arn:aws:iam::\d+:mfa/[A-Za-z0-9+=,.@_-]+$" }
$mfa_count = $mfa_devices.Count

if ($mfa_count -eq 0) {
Expand Down Expand Up @@ -78,4 +80,4 @@ Write-Host "To use these credentials:"
Write-Host "* For specific commands: aws s3 ls --profile $new_profile"
Write-Host "* For this session: `$env:AWS_PROFILE = '$new_profile'"
Write-Host ""
Write-Host "Remember to renew your credentials before they expire."
Write-Host "Remember to renew your credentials before they expire."
8 changes: 5 additions & 3 deletions aws-mfa-auth.sh
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Expand Up @@ -22,8 +22,10 @@ prompt_input "Enter your AWS profile name (Default: default): " aws_profile "def
echo "Fetching MFA devices..."
mfa_devices=$(aws iam list-mfa-devices --profile "$aws_profile" --output json)

# Filter out U2F devices
mfa_devices=$(echo "$mfa_devices" | jq '.MFADevices | map(select(.SerialNumber | test("^arn:aws:iam::[0-9]+:mfa/")))')
# Filter out U2F devices by ensuring the ARN only contains a single path segment
# after "mfa/" (e.g. arn:aws:iam::123456789012:mfa/username). U2F devices include
# additional segments which cause AWS CLI authentication to fail.
mfa_devices=$(echo "$mfa_devices" | jq '.MFADevices | map(select(.SerialNumber | test("^arn:aws:iam::[0-9]+:mfa/[A-Za-z0-9+=,.@_-]+$")))')
mfa_count=$(echo "$mfa_devices" | jq 'length')

if [ "$mfa_count" -eq 0 ]; then
Expand Down Expand Up @@ -70,4 +72,4 @@ echo "To use these credentials:"
echo "1. For specific commands: aws s3 ls --profile $new_profile"
echo "2. For this session: export AWS_PROFILE=$new_profile"
echo
echo "Remember to renew your credentials before they expire."
echo "Remember to renew your credentials before they expire."