Add authenticated endpoint.

This commit is contained in:
Tom Alexander 2024-10-15 23:03:52 -04:00
parent f9d3c551f0
commit f4ba2eff44
Signed by: talexander
GPG Key ID: D3A179C9A53C0EDE
14 changed files with 490 additions and 29 deletions

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@ -0,0 +1,29 @@
from __future__ import annotations
from pydantic import BaseModel, Field
from typing import Literal, Annotated, Union
class ResponseJwks(BaseModel):
keys: list[ResponseJwk]
class ResponseRsaJwk(BaseModel):
kty: Literal["RSA"]
d: str | None
q: str | None
qi: str | None
dq: str | None
e: str | None
key_ops: list[str] | None
dp: str | None
n: str | None
p: str | None
class ResponseEcJwk(BaseModel):
kty: Literal["EC"]
ResponseJwk = Annotated[
Union[ResponseRsaJwk, ResponseEcJwk], Field(discriminator="kty")
]

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@ -0,0 +1,41 @@
import jwt
import subprocess
from pathlib import Path
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.backends import default_backend
import time
def main():
gateway_address = get_terraform_output("gateway_address")
client_id = get_terraform_output("client_id")
jwt_private_key = get_terraform_output("jwt_private_key")
private_key = serialization.load_pem_private_key(
jwt_private_key.encode("utf-8"), password=None, backend=default_backend()
)
encoded = jwt.encode(
{
"client_id": client_id,
"iss": "issuer of the token",
"sub": "Alice",
"aud": f"https://{gateway_address}",
"iat": int(time.time()),
"exp": int(time.time()) + 30 * 60 * 60 * 24,
},
private_key,
algorithm="RS256",
)
print(encoded)
def get_terraform_output(name: str) -> str:
terraform_folder = Path(__file__).parent / "../../terraform"
result = subprocess.run(
["terraform", f"-chdir={terraform_folder}", "output", "-raw", name],
stdout=subprocess.PIPE,
)
return result.stdout.decode("utf-8")
if __name__ == "__main__":
main()

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@ -1,4 +1,13 @@
from __future__ import annotations
from fastapi import FastAPI
import jwt.algorithms
import jwt
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.backends import default_backend
from functools import cache
import os
from api_server.jwks_schema import ResponseJwks, ResponseRsaJwk
import time
app = FastAPI()
@ -6,3 +15,47 @@ app = FastAPI()
@app.get("/")
async def root():
return {"message": "Hello World"}
@app.get("/some_protected_endpoint")
async def protected_endpoint():
return {"message": "You reached the protected endpoint"}
@app.get("/get_short_lived_token")
async def get_short_lived_token():
gateway_address = os.environ["JWT_GATEWAY_ADDRESS"]
client_id = os.environ["JWT_CLIENT_ID"]
jwt_private_key = os.environ["JWT_PRIVATE_KEY"]
private_key = serialization.load_pem_private_key(
jwt_private_key.encode("utf-8"), password=None, backend=default_backend()
)
encoded = jwt.encode(
{
"client_id": client_id,
"iss": "issuer of the token",
"sub": "Alice",
"aud": f"https://{gateway_address}",
"iat": int(time.time()),
"exp": int(time.time()) + 5 * 60,
},
private_key,
algorithm="RS256",
)
return {"message": "This JWT will only last 5 minutes.", "token": encoded}
@app.get("/.well-known/jwks.json")
async def jwks() -> ResponseJwks:
return _generate_jwks()
@cache
def _generate_jwks() -> ResponseJwks:
public_key_pem = os.environ["JWT_PUBLIC_KEY"]
serialization.load_pem_public_key(
public_key_pem.encode("utf-8"), password=None, backend=default_backend()
)
jwk_json = jwt.algorithms.RSAAlgorithm.to_jwk(public_key)
return ResponseJwks(keys=[ResponseRsaJwk.model_validate_json(jwk_json)])

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@ -1,4 +1,6 @@
FROM alpine:3.20 AS builder
ARG ALPINE_VERSION="3.20"
FROM alpine:${ALPINE_VERSION} AS builder
RUN apk add --no-cache python3 poetry py3-poetry-plugin-export
@ -10,7 +12,7 @@ RUN poetry export --output=requirements.txt
FROM alpine:3.20 AS runner
FROM alpine:${ALPINE_VERSION} AS runner
RUN addgroup web && adduser -D -G web web && install -d -D -o web -g web -m 700 /source
WORKDIR /source

158
api_server/poetry.lock generated
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@ -75,6 +75,85 @@ d = ["aiohttp (>=3.7.4)", "aiohttp (>=3.7.4,!=3.9.0)"]
jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
uvloop = ["uvloop (>=0.15.2)"]
[[package]]
name = "cffi"
version = "1.17.1"
description = "Foreign Function Interface for Python calling C code."
optional = false
python-versions = ">=3.8"
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]
[package.dependencies]
pycparser = "*"
[[package]]
name = "click"
version = "8.1.7"
@ -100,6 +179,55 @@ files = [
{file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
]
[[package]]
name = "cryptography"
version = "43.0.1"
description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
optional = false
python-versions = ">=3.7"
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{file = "cryptography-43.0.1.tar.gz", hash = "sha256:203e92a75716d8cfb491dc47c79e17d0d9207ccffcbcb35f598fbe463ae3444d"},
]
[package.dependencies]
cffi = {version = ">=1.12", markers = "platform_python_implementation != \"PyPy\""}
[package.extras]
docs = ["sphinx (>=5.3.0)", "sphinx-rtd-theme (>=1.1.1)"]
docstest = ["pyenchant (>=1.6.11)", "readme-renderer", "sphinxcontrib-spelling (>=4.0.1)"]
nox = ["nox"]
pep8test = ["check-sdist", "click", "mypy", "ruff"]
sdist = ["build"]
ssh = ["bcrypt (>=3.1.5)"]
test = ["certifi", "cryptography-vectors (==43.0.1)", "pretend", "pytest (>=6.2.0)", "pytest-benchmark", "pytest-cov", "pytest-xdist"]
test-randomorder = ["pytest-randomly"]
[[package]]
name = "fastapi"
version = "0.115.2"
@ -193,6 +321,17 @@ files = [
docs = ["furo (>=2023.9.10)", "proselint (>=0.13)", "sphinx (>=7.2.6)", "sphinx-autodoc-typehints (>=1.25.2)"]
test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.4.3)", "pytest-cov (>=4.1)", "pytest-mock (>=3.12)"]
[[package]]
name = "pycparser"
version = "2.22"
description = "C parser in Python"
optional = false
python-versions = ">=3.8"
files = [
{file = "pycparser-2.22-py3-none-any.whl", hash = "sha256:c3702b6d3dd8c7abc1afa565d7e63d53a1d0bd86cdc24edd75470f4de499cfcc"},
{file = "pycparser-2.22.tar.gz", hash = "sha256:491c8be9c040f5390f5bf44a5b07752bd07f56edf992381b05c701439eec10f6"},
]
[[package]]
name = "pydantic"
version = "2.9.2"
@ -317,6 +456,23 @@ files = [
[package.dependencies]
typing-extensions = ">=4.6.0,<4.7.0 || >4.7.0"
[[package]]
name = "pyjwt"
version = "2.9.0"
description = "JSON Web Token implementation in Python"
optional = false
python-versions = ">=3.8"
files = [
{file = "PyJWT-2.9.0-py3-none-any.whl", hash = "sha256:3b02fb0f44517787776cf48f2ae25d8e14f300e6d7545a4315cee571a415e850"},
{file = "pyjwt-2.9.0.tar.gz", hash = "sha256:7e1e5b56cc735432a7369cbfa0efe50fa113ebecdc04ae6922deba8b84582d0c"},
]
[package.extras]
crypto = ["cryptography (>=3.4.0)"]
dev = ["coverage[toml] (==5.0.4)", "cryptography (>=3.4.0)", "pre-commit", "pytest (>=6.0.0,<7.0.0)", "sphinx", "sphinx-rtd-theme", "zope.interface"]
docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
tests = ["coverage[toml] (==5.0.4)", "pytest (>=6.0.0,<7.0.0)"]
[[package]]
name = "pyright"
version = "1.1.384"
@ -379,4 +535,4 @@ files = [
[metadata]
lock-version = "2.0"
python-versions = "^3.12"
content-hash = "eb858921311d767fbc6e8b45ef3fbb86a299b1a389408fafc7facd3a07eaa866"
content-hash = "4d0ace334226402b2f825c6d1d480056b7588d4f79ccbf2297ec01c720b74108"

View File

@ -7,6 +7,9 @@ authors = []
[tool.poetry.dependencies]
python = "^3.12"
fastapi = "^0.115.2"
pydantic = "^2.9.2"
pyjwt = "^2.9.0"
cryptography = "^43.0.1"
[tool.poetry.group.dev.dependencies]
black = "^24.1.1"

22
scripts/get_jwks.bash Executable file
View File

@ -0,0 +1,22 @@
#!/usr/bin/env bash
#
# Key the JWKS
set -euo pipefail
IFS=$'\n\t'
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
function main() {
local gateway_address
gateway_address=$(tf output -raw gateway_address)
curl "https://$gateway_address/.well-known/jwks.json"
}
function tf() {
terraform -chdir="$DIR/../terraform" "${@}"
}
main "${@}"

View File

@ -0,0 +1,24 @@
#!/usr/bin/env bash
#
# Hit an endpoint that requires a valid JWT.
set -euo pipefail
IFS=$'\n\t'
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
function main() {
local jwt
jwt=$(cd "$DIR"/../api_server && poetry run python -m api_server.local_generate_long_lived_token)
local gateway_address
gateway_address=$(tf output -raw gateway_address)
curl -H "Authorization: Bearer $jwt" "https://$gateway_address/some_protected_endpoint"
}
function tf() {
terraform -chdir="$DIR/../terraform" "${@}"
}
main "${@}"

View File

@ -60,3 +60,22 @@ provider "registry.terraform.io/hashicorp/random" {
"zh:fbef0781cb64de76b1df1ca11078aecba7800d82fd4a956302734999cfd9a4af",
]
}
provider "registry.terraform.io/hashicorp/tls" {
version = "4.0.6"
hashes = [
"h1:dYSb3V94K5dDMtrBRLPzBpkMTPn+3cXZ/kIJdtFL+2M=",
"zh:10de0d8af02f2e578101688fd334da3849f56ea91b0d9bd5b1f7a243417fdda8",
"zh:37fc01f8b2bc9d5b055dc3e78bfd1beb7c42cfb776a4c81106e19c8911366297",
"zh:4578ca03d1dd0b7f572d96bd03f744be24c726bfd282173d54b100fd221608bb",
"zh:6c475491d1250050765a91a493ef330adc24689e8837a0f07da5a0e1269e11c1",
"zh:81bde94d53cdababa5b376bbc6947668be4c45ab655de7aa2e8e4736dfd52509",
"zh:abdce260840b7b050c4e401d4f75c7a199fafe58a8b213947a258f75ac18b3e8",
"zh:b754cebfc5184873840f16a642a7c9ef78c34dc246a8ae29e056c79939963c7a",
"zh:c928b66086078f9917aef0eec15982f2e337914c5c4dbc31dd4741403db7eb18",
"zh:cded27bee5f24de6f2ee0cfd1df46a7f88e84aaffc2ecbf3ff7094160f193d50",
"zh:d65eb3867e8f69aaf1b8bb53bd637c99c6b649ba3db16ded50fa9a01076d1a27",
"zh:ecb0c8b528c7a619fa71852bb3fb5c151d47576c5aab2bf3af4db52588722eeb",
"zh:f569b65999264a9416862bca5cd2a6177d94ccb0424f3a4ef424428912b9cb3c",
]
}

View File

@ -11,6 +11,27 @@ resource "google_cloud_run_v2_service" "api_server" {
ports {
container_port = 8080
}
env {
name = "JWT_PUBLIC_KEY"
value = tls_private_key.jwt_private_key.public_key_pem
}
env {
name = "JWT_PRIVATE_KEY"
value_source {
secret_key_ref {
secret = google_secret_manager_secret.jwt_private_key.secret_id
version = "latest"
}
}
}
env {
name = "JWT_CLIENT_ID"
value = random_uuid.jwt_client_id.result
}
env {
name = "JWT_GATEWAY_ADDRESS"
value = google_api_gateway_gateway.gateway.default_hostname
}
}
}

View File

@ -1,3 +1,6 @@
resource "random_uuid" "jwt_client_id" {
}
resource "google_api_gateway_api" "api" {
provider = google-beta
project = google_project.project.project_id
@ -13,31 +16,8 @@ resource "google_api_gateway_api_config" "api_config" {
openapi_documents {
document {
path = "spec.yaml"
contents = base64encode(<<-EOF
swagger: "2.0"
info:
title: the-gateway foo
description: "Run auth through Google API Gateway."
version: "1.0.0"
schemes:
- "https"
produces:
- application/json
x-google-backend:
address: ${google_cloud_run_v2_service.api_server.uri}
paths:
"/":
get:
description: "Hello World."
operationId: "helloWorld"
responses:
200:
description: "Success."
schema:
type: string
EOF
)
path = "spec.yaml"
contents = base64encode(templatefile("openapi_spec.yaml", { backend_url = google_cloud_run_v2_service.api_server.uri, client_id = random_uuid.jwt_client_id.result }))
}
}
}
@ -47,9 +27,20 @@ resource "google_api_gateway_gateway" "gateway" {
project = google_project.project.project_id
api_config = google_api_gateway_api_config.api_config.id
gateway_id = "gateway-to-the-api"
# Delete this when api_config changes, otherwise if api_config needs to be replaced, it errors out because it is "in use" by this gateway. I wish this could be triggered only when api_config is being replaced instead of all edits.
lifecycle {
replace_triggered_by = [
google_api_gateway_api_config.api_config
]
}
}
output "gateway_address" {
value = google_api_gateway_gateway.gateway.default_hostname
}
output "client_id" {
value = random_uuid.jwt_client_id.result
}

39
terraform/jwt_key.tf Normal file
View File

@ -0,0 +1,39 @@
#
# Warning: This file contains terraform that will lead to secrets being stored in the terraform state file unencrypted. It is not suitable for a production deploy, but since this is a test/experiment, the additional automation outweighed the potential risk.
#
resource "tls_private_key" "jwt_private_key" {
algorithm = "RSA"
rsa_bits = 2048
}
resource "google_secret_manager_secret" "jwt_private_key" {
project = google_project.project.project_id
secret_id = "jwt-private-key"
replication {
auto {}
}
depends_on = [google_project_service.service["secretmanager"], ]
}
resource "google_secret_manager_secret_version" "jwt_private_key" {
secret = google_secret_manager_secret.jwt_private_key.id
secret_data = tls_private_key.jwt_private_key.private_key_pem
}
resource "google_secret_manager_secret_iam_member" "member" {
project = google_secret_manager_secret.jwt_private_key.project
secret_id = google_secret_manager_secret.jwt_private_key.secret_id
role = "roles/secretmanager.secretAccessor"
member = "serviceAccount:${google_project.project.number}-compute@developer.gserviceaccount.com"
# TODO: This should probably be using a service account specific to the cloud run service instead of the compute service agent.
}
output "jwt_private_key" {
value = tls_private_key.jwt_private_key.private_key_pem
sensitive = true
}

View File

@ -74,7 +74,7 @@ resource "google_project" "project" {
resource "google_project_service" "service" {
project = google_project.project.project_id
for_each = toset(["run", "artifactregistry", "apigateway"])
for_each = toset(["run", "artifactregistry", "apigateway", "secretmanager"])
service = "${each.key}.googleapis.com"
disable_dependent_services = true
}

View File

@ -0,0 +1,61 @@
swagger: "2.0"
info:
title: the-gateway foo
description: "Run auth through Google API Gateway."
version: "1.0.0"
schemes:
- "https"
produces:
- application/json
x-google-backend:
address: ${backend_url}
paths:
"/":
get:
description: "Hello World."
operationId: "helloWorld"
responses:
200:
description: "Success."
schema:
type: string
"/.well-known/jwks.json":
get:
description: "JWKS."
operationId: "jwks"
responses:
200:
description: "Success."
schema:
type: string
"/some_protected_endpoint":
get:
description: "An endpoint that requires auth."
operationId: "someProtectedEndpoint"
security:
- your_custom_auth_id: []
responses:
200:
description: "Success."
schema:
type: string
"/get_short_lived_token":
get:
description: "An endpoint that gives a short-lived JWT."
operationId: "getShortLivedToken"
security:
- your_custom_auth_id: []
responses:
200:
description: "Success."
schema:
type: string
securityDefinitions:
your_custom_auth_id:
authorizationUrl: ""
flow: "implicit"
type: "oauth2"
# The value below should be unique
x-google-issuer: "issuer of the token"
x-google-jwks_uri: "${backend_url}/.well-known/jwks.json"
x-google-audiences: "${client_id}"