forked from hswaw/hscloud
115 lines
4.1 KiB
Markdown
115 lines
4.1 KiB
Markdown
Old Shitty Arista eAPI/Capi <-> gRPC proxy
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==========================================
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Our Arista 7148S does not support gRPC/OpenConfig, so we have to make our own damn gRPC proxy.
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The schema is supposed to be 1:1 mapped to the JSON-RPC EAPI. This is just a dumb proxy.
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PKI Introduction
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----------------
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This project is a testing ground for the HSCloud PKI setup. Long story short,
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all gRPC is mutually authenticated via TLS (server & client certs).
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All certs for mutual auth have the following CN/SAN format:
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<job>.<principal>.<realm>
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For example, if principal maps into a 'group' and job into a 'user':
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arista-proxy-dcr01u23.prod.c.example.com
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job = arista-proxy-dcr01u23
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principal = cluster-management-prod
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realm = c.example.com
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The Realm is a DNS name that is global to all jobs that need mutual authentication.
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The Principal is any name that carries significance for logical grouping of jobs.
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It can, but doesn't need to, group jobs by similar permissions.
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The Job is any name that identifies uniquely (within the principal) a security
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endpoint that describes a single security policy for a gRPC endpoint.
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The entire CN should be DNS resolvable into an IP address that would respond to
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gRPC requests on port 42000 (with a server TLS certificate that represents this CN) if the
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job represents a service.
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This maps nicely to the Kubernetes Cluster DNS format if you set `realm` to `svc.cluster.local`.
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Then, `principal` maps to a Kubernetes namespace, and `job` maps into a Kubernetes service.
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arista-proxy-dcr01u23.arista-prod.svc.cluster.local
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job/service = arista-proxy-dcr01u23
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principal/namespace = arista-prod
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realm = svc.cluster.local
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ACLs based on job/principal are yet to be implemented :).
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PKI Certs for Development
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-------------------------
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In production, those certs will be automatigacally provided for you by
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automation. In development, you'll have to do the following:
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cd pki
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./gen.sh
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This will generate:
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- `pki/ca.pem` - CA certificate
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- `pki/client{,-key}.pem` - certificate and key for `developer.humans.svc.cluster.local`
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- `pki/service{,-key}.pem` - certificate and key for `test.arista-proxy.svc.cluster.local`
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You will have to setup an /etc/hosts alias to make `test.arista-proxy.svc.cluster.local` resolve to your machine.
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# cat /etc/hosts
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...
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127.0.0.1 test.arista-proxy.svc.cluster.local
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...
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You can then start `arista-proxy` with default flags and talk to it via gRPC:
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./arista-proxy
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alias grpc-dev="grpc -cacert $(pwd)/pki/ca.pem -key $(pwd)/pki/client-key.pem -cert $(pwd)/pki/client.pem"
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grpc-dev test.arista-proxy.svc.cluster.local:42000 proto.AristaProxy.ShowVersion
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Debug Status Page
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-----------------
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The `debug_address` flag controls spawning an HTTP server useful for debugging. You can use it to inspect gRPC request and view general status information of the proxy.
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Flags
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-----
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./arista-proxy -help
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Usage of ./arista-proxy:
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-alsologtostderr
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log to standard error as well as files
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-arista_api string
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Arista remote endpoint (default "http://admin:password@1.2.3.4:80/command-api")
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-debug_address string
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Debug HTTP listen address, or empty to disable (default "127.0.0.1:30000")
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-listen_address string
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gRPC listen address (default "127.0.0.1:30001")
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-log_backtrace_at value
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when logging hits line file:N, emit a stack trace
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-log_dir string
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If non-empty, write log files in this directory
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-logtostderr
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log to standard error instead of files
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-pki_realm string
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PKI realm (default "svc.cluster.local")
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-stderrthreshold value
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logs at or above this threshold go to stderr
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-tls_ca_path string
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Path to PKI CA certificate (default "pki/ca.pem")
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-tls_certificate_path string
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Path to PKI service certificate (default "pki/service.pem")
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-tls_key_path string
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Path to PKI service private key (default "pki/service-key.pem")
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-v value
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log level for V logs
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-vmodule value
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comma-separated list of pattern=N settings for file-filtered logging
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