azure-identity-rust

# Azure Identity library for Rust Microsoft Entra ID authentication for Azure SDK clients. Use this skill when: - An app needs to authenticate to Azure services from Rust - You need `DeveloperToolsCredential` for local development - You need `ManagedIdentityCredential` for Azure-hosted workloads - You need service principal auth with secret or certificate > **IMPORTANT:** Only use official `azure_*` crates published by the [azure-sdk](https://crates.io/users/azure-sdk) crates.io user. Do NOT use the deprecated `azure_sdk_*` crates (MindFlavor/AzureSDKForRust) or community crates. Official crates use underscores in names and none have version 0.21.0. > **Note:** The Rust SDK does not have `DefaultAzureCredential`. Use `DeveloperToolsCredential` for local development and `ManagedIdentityCredential` for production. ## Installation ```sh cargo add azure_identity azure_core tokio ``` > If your code uses `azure_core` types directly, add `azure_core` to `Cargo.toml`. If you only use service-crate re-exports, direct `azure_core` dependency is optional. ## Environment Variables ```bash AZURE_TENANT_ID=<your-tenant-id> # Required for service principal auth AZURE_CLIENT_ID=<your-client-id> # Required for service principal or user-assigned managed identity AZURE_CLIENT_SECRET=<your-client-secret> # Required for ClientSecretCredential ``` ## Authentication ### DeveloperToolsCredential (Local Development) Tries Azure CLI then Azure Developer CLI: ```rust use azure_identity::DeveloperToolsCredential; use azure_security_keyvault_secrets::SecretClient; #[tokio::main] async fn main() -> Result<(), Box<dyn std::error::Error>> { // Local dev: DeveloperToolsCredential. Production: use ManagedIdentityCredential. let credential = DeveloperToolsCredential::new(None)?; let client = SecretClient::new( "https://<vault-name>.vault.azure.net/", credential.clone(), None, )?; let secret = client.get_secret("secret-name", None).await?.into_model()?; println!("Secret: {:?}", secret.value); Ok(()) } ``` Ensure you are logged in: ```sh az login # Azure CLI azd auth login # or Azure Developer CLI ``` | Order | Credential | Login Command | | ----- | --------------------------- | ---------------- | | 1 | AzureCliCredential | `az login` | | 2 | AzureDeveloperCliCredential | `azd auth login` | ### ManagedIdentityCredential (Production) For Azure-hosted resources (VMs, App Service, Functions, AKS): ```rust use azure_identity::ManagedIdentityCredential; // System-assigned managed identity let credential = ManagedIdentityCredential::new(None)?; ``` ### ClientSecretCredential (Service Principal) For CI/CD pipelines and service accounts: ```rust use azure_identity::ClientSecretCredential; let credential = ClientSecretCredential::new( "<tenant-id>", "<client-id>", "<client-secret>", None, )?; ``` ## Credential Types | Credential | Use Case | | ----------------------------- | -------------------------------------- | | `DeveloperToolsCredential` | Local development — tries CLI tools | | `ManagedIdentityCredential` | Azure VMs, App Service, Functions, AKS | | `WorkloadIdentityCredential` | Kubernetes workload identity | | `ClientSecretCredential` | Service principal with secret | | `ClientCertificateCredential` | Service principal with certificate | | `AzureCliCredential` | Direct Azure CLI auth | | `AzureDeveloperCliCredential` | Direct azd CLI auth | | `AzurePipelinesCredential` | Azure Pipelines service connection | | `ClientAssertionCredential` | Custom assertions (federated identity) | ## Best Practices 1. **Use `cargo add` to manage dependencies, never edit `Cargo.toml` directly.** Add and remove Rust SDK dependencies with cargo commands instead of manual manifest edits. 2. **Add `azure_core` only when importing `azure_core` types directly.** If your code imports `azure_core::http::Url`, `azure_core::http::RequestContent`, or `azure_core::error::ErrorKind`, include `azure_core`; otherwise a direct dependency is optional. 3. **Use `DeveloperToolsCredential`** for local dev, **`ManagedIdentityCredential`** for production — Rust does not provide a single `DefaultAzureCredential` type 4. **Never hardcode credentials** — use environment variables for service principals 5. **Clone credentials** — pass `credential.clone()` when constructing multiple clients; credentials are `Arc`-wrapped 6. **Reuse clients** — clients are thread-safe; create once, share across tasks 7. **Assign RBAC roles** — ensure the identity has appropriate roles for the target service (e.g., "Key Vault Secrets User" for secret reads) ## Reference Links | Resource | Link | | ------------- | --------------------------------------------------------------------------------- | | API Reference | https://docs.rs/azure_identity/latest/azure_identity | | crates.io | https://crates.io/crates/azure_identity | | Source Code | https://github.com/Azure/azure-sdk-for-rust/tree/main/sdk/identity/azure_identity |