1.4.X

Security Debugging

This document describes some tools for understanding and debugging Orc8r security. Read the Security Overview first for a top-level understanding of the security architecture.

Architecture

By default, TLS is mutually terminated at the edge of both Orc8r and gateways

  • Orc8r terminates at Orc8r proxy
    • Server certificate: controller.crt
    • Client-validation certificate: certifier.pem
  • Gateways terminate at their control_proxy service
    • Server-validation certificate: rootCA.pem
    • Client certificate: gateway.crt

In the default configuration, with a registered and fully bootstrapped gateway, TLS termination looks like this

Orc8r proxying

Certificates

Starting point for understanding the set of certificates related to Orc8r

  • General
    • rootCA.pem CA certificate which signed controller.crt (root of trust)
      • When Orc8r self-signs its certificates, the rootCA.key will also be included in the deployment
    • admin_operator.{key.pem,pem} admin operator certificates for full access to Orc8r's northbound interface by NMS and CLIs
  • Orc8r
    • controller.{key,crt} server-validation certificate for Orc8r and NMS, signed by rootCA.pem
    • certifier.pem Orc8r's client-validation certificate (root of trust)
    • bootstrapper.key Orc8r's signing key used in the bootstrap process
    • fluentd.{key,pem} Orc8r's certificates for its fluentd endpoints (fluentd is currently outside Orc8r proxy)
  • Gateway
    • gw_challenge.key gateway's long-term key used for the bootstrap process
    • gateway.{key,crt} gateway's session certificates, used as client certificates to Orc8r proxy

There are two roots of trust in Orc8r, as identified above

  • rootCA.pem
    • Root of trust for server validation
    • controller.crt, signed by rootCA.pem, is presented by Orc8r during TLS handshakes
  • certifier.pem
    • Root of trust for client validation
    • gateway.crt, signed by certifier.pem, is presented by gateways during TLS handshakes

Endpoints

Default Orc8r endpoints, as exposed on Orc8r proxy

  • :80 K8s liveness probe (open)
  • :443 northbound interface exposing a REST API (mutually-authenticated)
    • Orc8r proxy exposes this over :9443, which Helm then maps to :443
  • :8443 general southbound interface (mutually-authenticated)
  • :8444 bootstrapper southbound interface (server-authenticated)

Gateway bootstrap

The gateway bootstrap process allows registered gateways to securely request signed session certificates from Orc8r, without Orc8r needing to maintain a stateful view of the bootstrap process.

Before the bootstrap process, operators provision a gateway with Orc8r by including the gateway's hardware ID and the public version of the gateway's gw_challenge.key. Then, during the two-phase bootstrap process, the gateway requests a challenge, signs and returns the challenge along with a CSR, then receives back signed session certificates.

Get challenge

Performed via the GetChallenge RPC, where a gateway requests a challenge over a server-validated endpoint.

  • Define nonce := randomBytes || timestamp
  • Define signature := sign(sha256_digest( randomBytes || timestamp )), computed using Orc8r's bootstrapper.key
  • Define challenge := nonce || signature
  • Orc8r returns challenge to gateway

Get signed session certificates

Performed via the RequestSign RPC, where a gateway presents the gateway-signed challenge and a CSR, and receives back the Orc8r-signed CSR.

  • Define signed_challenge := sign(sha256_digest( challenge )), computed using gateway's gw_challenge.key
  • Gateway sends challenge, signed_challenge, and a CSR
  • Orc8r validates request
    • Validate challenge by verifying the original embedded signature and the validity window
    • Validate singed_challenge by verifying the gateway's signature of challenge
  • Orc8r returns the CSR as the gateway's session certificates, signed by certifier.pem

Implementation details

Some implementation-specific details, useful for debugging

  • Challenge is valid for short period of time (5 minutes)
  • Signed CSR includes capped validity duration (4 days)
    • Gateways proactively reach out before expiration to re-bootstrap
  • Orc8r supports the echo bootstrap mode on a per-gateway basis, where, for testing purposes, gateways simply echo back the challenge to receive session certs
  • Since Orc8r retains no state across the GetChallenge and RequestSign calls, gateways can make multiple RequestSign requests with the same challenge. This is admissible because session certificates are only granted if the requesting gateway possesses the requisite private key.

Debug tools

This section includes a selection of notes and commands useful for debugging Orc8r from a security perspective.

Notes

Gateway information

  • show_gateway_info.py show gateway's hardware ID and (public part of) gw_challenge.key
  • checkin_cli.py attempt to check in to Orc8r, outputting debug information on failure

CLI commands

These commands have been useful for debugging Orc8r's northbound and southbound interfaces. These commands are presented targeting a local dev Orc8r spun up by the default docker-compose file, but with minor modifications they can target arbitrary production deployments.

Utilized tools

View certificates and ACLs

# These commands are run from one of Orc8r's application containers/pods

# List all registered operators, along with their ACLs and certificate serial numbers
envdir /var/opt/magma/envdir /var/opt/magma/bin/accessc list

# List all registered certificates, along with their associated identities
envdir /var/opt/magma/envdir /var/opt/magma/bin/accessc list-certs

Debug northbound interface (REST API)

# Make verbose request to REST API ("list networks" endpoint)
curl \
    --insecure \
    --verbose \
    --key ${MAGMA_ROOT}/.cache/test_certs/admin_operator.key.pem \
    --cert ${MAGMA_ROOT}/.cache/test_certs/admin_operator.pem \
    'https://localhost:9443/magma/v1/networks' \
    -H 'accept: application/json'

# Open connection to REST API, logging certificate and handshake info
# See below for some HTTP requests to use once the connection is open
openssl s_client \
    -showcerts \
    -CAfile ${MAGMA_ROOT}/.cache/test_certs/rootCA.pem \
    -key ${MAGMA_ROOT}/.cache/test_certs/admin_operator.key.pem \
    -cert ${MAGMA_ROOT}/.cache/test_certs/admin_operator.pem \
    -connect localhost:9443

Debug southbound interface (gRPC)

# Emulate gateway request to bootstrapper service's GetChallenge endpoint (unprotected)
grpcurl \
    -insecure \
    -authority bootstrapper-controller.magma.test \
    -proto /tmp/magma_protos/orc8r/protos/bootstrapper.proto \
    -import-path /tmp/magma_protos/ \
    localhost:7444 \
    magma.orc8r.Bootstrapper/GetChallenge

# Emulate gateway request to state service's ReportStates endpoint (protected)
grpcurl \
    -insecure \
    -key /tmp/magma_protos/gateway.key \   # copied from target gateway
    -cert /tmp/magma_protos/gateway.crt \  # copied from target gateway
    -authority state-controller.magma.test \
    -protoset /tmp/magma_protos/out.protoset \
    -d '{"states": [{"type": "test"}]}' \
    localhost:7443 \
    magma.orc8r.StateService/ReportStates

# Emulate gateway request to state service's GetStates endpoint (protected)
#
# Note: this is an Orc8r-internal endpoint. To run this outside an Orc8r
# application container, you may have to temporarily mutate some access
# enforcment configuration in your dev setup. Alternatively, you could
# run this command from inside an Orc8r application pod.
grpcurl \
    -insecure \
    -key /tmp/magma_protos/gateway.key \   # copied from target gateway
    -cert /tmp/magma_protos/gateway.crt \  # copied from target gateway
    -authority state-controller.magma.test \
    -protoset /tmp/magma_protos/out.protoset \
    -d '{"networkID": "test"}' \
    localhost:7443 \
    magma.orc8r.StateService/GetStates

Some HTTP requests to use with s_client

GET / HTTP/1.1
Host: localhost:9443

GET /magma/v1/networks HTTP/1.1
Host: localhost:9443

Miscellaneous commands

# Examine a certificate copied to clipboard (macOS)
openssl x509 -text -noout -in <(pbpaste)

# Verify controller's certificate
openssl verify \
    -CAfile ${MAGMA_ROOT}/.cache/test_certs/rootCA.pem \
    ${MAGMA_ROOT}/.cache/test_certs/controller.crt

# Verify gateway's session certificate
openssl verify \
    -CAfile ${MAGMA_ROOT}/.cache/test_certs/certifier.pem \
    gateway.crt  # copied from target gateway

# Consolidate Magma and its imported protos, copying to /tmp/magma_protos/
${MAGMA_ROOT}/orc8r/tools/scripts/consolidate_protos.sh

# Generate compiled proto definitions
cd /tmp/magma_protos/ && \
protoc \
    -I . \
    -I orc8r/protos/prometheus/ \
    --descriptor_set_out out.protoset \
    --include_imports \
    orc8r/cloud/go/services/state/protos/indexer.proto  # or target proto
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