War Story: We Replaced AWS IAM with Vault 1.16 and Cut Our Permission Error Rate by 60% for 500+ Developers

It looks like the code snippet you provided is a Go program that demonstrates how to authenticate with Vault using an EKS workload identity token and then retrieve dynamic AWS IAM credentials. Here's a breakdown of what each part does:

1. Connecting to Vault

• The program first checks if it can connect to Vault by calling client.Sys().SealStatus(). If the vault is sealed, the program exits.

2. Reading EKS Service Account Token

• It reads an OIDC token from a predefined path (/var/run/secrets/eks.amazonaws.com/serviceaccount/token). This token is used to authenticate with Vault.

3. Logging into Vault

• The program uses the AWS auth backend in Vault to log in using the EKS workload identity token.

  go
   
  1loginData := map[string]interface{}{
  2    "role":                "developer-deploy-staging",
  3    "jwt":                 string(jwtToken),
  4    "service_account_name": "deploy-sa",
  5    "service_account_namespace": "staging",
  6}

• The loginPath is "auth/aws-eks-staging/login", which matches the backend configuration in Terraform

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