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feat: Add support for assuming an AWS IAM role from the provider. #486

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Merged
cyrilgdn merged 5 commits into from
Nov 7, 2024
Merged

feat: Add support for assuming an AWS IAM role from the provider. #486

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5b74075
feat: Add support for assuming an AWS IAM role from the provider.
zizzencs Oct 30, 2024
0c5fea3
Update postgresql/provider.go
zizzencs Nov 4, 2024
d7992e1
Update postgresql/provider.go
zizzencs Nov 4, 2024
e3c33a9
Update postgresql/provider.go
zizzencs Nov 4, 2024
58e64f0
Apply suggestions from code review
cyrilgdn Nov 7, 2024
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40 changes: 38 additions & 2 deletions postgresql/provider.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ package postgresql
import (
"context"
"fmt"
"github.com/aws/aws-sdk-go-v2/credentials"
"github.com/aws/aws-sdk-go-v2/service/sts"
"os"

"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
Expand Down Expand Up @@ -90,6 +92,13 @@ func Provider() *schema.Provider {
Description: "AWS region to use for IAM auth",
},

"aws_rds_iam_provider_role_arn": {
Type: schema.TypeString,
Optional: true,
Default: "",
Description: "AWS IAM role to assume for IAM auth",
},

"azure_identity_auth": {
Type: schema.TypeBool,
Optional: true,
Expand Down Expand Up @@ -227,7 +236,7 @@ func validateExpectedVersion(v interface{}, key string) (warnings []string, erro
return
}

func getRDSAuthToken(region string, profile string, username string, host string, port int) (string, error) {
func getRDSAuthToken(region string, profile string, role string, username string, host string, port int) (string, error) {
endpoint := fmt.Sprintf("%s:%d", host, port)

ctx := context.Background()
Expand All @@ -246,6 +255,32 @@ func getRDSAuthToken(region string, profile string, username string, host string
return "", err
}

if role != "" {
stsClient := sts.NewFromConfig(awscfg)
roleInput := &sts.AssumeRoleInput{
RoleArn: aws.String(role),
RoleSessionName: aws.String("TerraformSession"),
}

roleOutput, err := stsClient.AssumeRole(ctx, roleInput)
if err != nil {
return "", err
}

awscfg, err = awsConfig.LoadDefaultConfig(ctx,
awsConfig.WithCredentialsProvider(
aws.NewCredentialsCache(credentials.NewStaticCredentialsProvider(
*roleOutput.Credentials.AccessKeyId,
*roleOutput.Credentials.SecretAccessKey,
*roleOutput.Credentials.SessionToken,
)),
),
)
if err != nil {
return "", err
}
}

token, err := auth.BuildAuthToken(ctx, endpoint, awscfg.Region, username, awscfg.Credentials)

return token, err
Expand Down Expand Up @@ -312,8 +347,9 @@ func providerConfigure(d *schema.ResourceData) (interface{}, error) {
if d.Get("aws_rds_iam_auth").(bool) {
profile := d.Get("aws_rds_iam_profile").(string)
region := d.Get("aws_rds_iam_region").(string)
role := d.Get("aws_rds_iam_provider_role_arn").(string)
var err error
password, err = getRDSAuthToken(region, profile, username, host, port)
password, err = getRDSAuthToken(region, profile, role, username, host, port)
if err != nil {
return nil, err
}
Expand Down
1 change: 1 addition & 0 deletions website/docs/index.html.markdown
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Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,7 @@ The following arguments are supported:
from the environment (or the given profile, see `aws_rds_iam_profile`)
* `aws_rds_iam_profile` - (Optional) The AWS IAM Profile to use while using AWS RDS IAM Auth.
* `aws_rds_iam_region` - (Optional) The AWS region to use while using AWS RDS IAM Auth.
* `aws_rds_iam_provider_role_arn` - (Optional) AWS IAM role to assume while using AWS RDS IAM Auth.
* `azure_identity_auth` - (Optional) If set to `true`, call the Azure OAuth token endpoint for temporary token
* `azure_tenant_id` - (Optional) (Required if `azure_identity_auth` is `true`) Azure tenant ID [read more](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/data-sources/client_config.html)

Expand Down