feat: bf ca loads Gauntlets from plugins (#18)

bf ca can load gauntlet functions from plugin files.

.github/workflows/ci.yml

@@ -22,9 +22,9 @@ jobs:
         with:
           go-version-file: go.mod
 
-      - uses: golangci/golangci-lint-action@v3
+      - uses: golangci/golangci-lint-action@v6
         with:
-          version: "v1.55.2"
+          version: latest
 
       - run: go vet ./...
 

README.md

@@ -41,6 +41,53 @@ In pseudo-code,
 
 `bifrostUUID = UUIDv5(sha1(NamespaceClientIdentity + PublicKey.X.Bytes() + PublicKey.Y.Bytes())`
 
+## Gauntlet Plugins
+
+Bifrost Certificate Authority supports plugins that validate certificate signing requests.
+
+A plugin is a Go package that exports a function named `Gauntlet` that implements
+the [`tinyca.Gauntlet`](https://pkg.go.dev/github.com/RealImage/bifrost/pkg/tinyca#Gauntlet)
+interface.
+
+For example, here's a plugin that checks the ID of the public key from the certificate
+signing request against a list of allowed IDs:
+
+```go
+package main
+
+import (
+    "crypto/x509"
+    "encoding/pem"
+    "errors"
+    "fmt"
+    "io/ioutil"
+
+    "github.com/RealImage/bifrost/pkg/tinyca"
+)
+
+func Gauntlet(ctx context.Context, csr *bifrost.CertificateRequest) (*x509.Certificate, error) {
+    // Check the public key ID against a list of allowed IDs
+    if !isAllowed(csr.UUID) {
+        return nil, errors.New("public key ID not allowed")
+    }
+
+    tmpl := tinyca.TLSClientCertTemplate()
+    tmpl.Subject.OrganizationalUnit = []string{"my-app")}
+
+    return tmpl, nil
+}
+
+func isAllowed(id uuid.UUID) bool {
+    // Implement your logic here
+    return true
+}
+```
+
+The `bf ca` command loads a gauntlet plugin from the path specified in
+the `GAUNTLET_PLUGIN` environment variable or in the `--gauntlet-plugin` flag.
+
+```console
+
 ## Build
 
 ### Native

build.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 #
 # $1 - The version number to use for the build. Defaults to "dev".
-#    
+#
 #
 
 set -euo pipefail
@@ -10,7 +10,7 @@ app="$(basename "$PWD")"
 
 go install golang.org/x/tools/cmd/stringer@latest
 
-version="${1:-dev}"
+version="${1:-devel}"
 
 env VERSION="$version" go generate -x ./...
 

cmd/bf/ca.go

@@ -28,10 +28,11 @@ const (
 
 // caServeCmd flags
 var (
-	caHost        string
-	caPort        int64
-	enableCORS    bool
-	exposeMetrics bool
+	caHost         string
+	caPort         int64
+	enableCORS     bool
+	exposeMetrics  bool
+	gauntletPlugin string
 )
 
 var caServeCmd = &cli.Command{
@@ -77,6 +78,13 @@ var caServeCmd = &cli.Command{
 			Value:       false,
 			Destination: &exposeMetrics,
 		},
+		&cli.StringFlag{
+			Name:        "gauntlet-plugin",
+			Aliases:     []string{"g", "plugin"},
+			Sources:     cli.EnvVars("GAUNTLET_PLUGIN"),
+			Usage:       "path to a gauntlet plugin file",
+			Destination: &gauntletPlugin,
+		},
 	},
 	Action: func(ctx context.Context, _ *cli.Command) error {
 		cert, key, err := cafiles.GetCertKey(ctx, caCertUri, caPrivKeyUri)
@@ -91,7 +99,13 @@ var caServeCmd = &cli.Command{
 			"notAfter", cert.NotAfter,
 		)
 
-		ca, err := tinyca.New(cert, key, nil)
+		gauntlet, err := tinyca.LoadGauntlet(gauntletPlugin)
+		if err != nil {
+			slog.ErrorContext(ctx, "error loading interceptor plugin", "error", err)
+			return cli.Exit("Error loading interceptor plugin", 1)
+		}
+
+		ca, err := tinyca.New(cert, key, gauntlet)
 		if err != nil {
 			slog.ErrorContext(ctx, "error creating CA", "error", err)
 			return cli.Exit("Error creating CA", 1)

go.mod

@@ -1,41 +1,42 @@
 module github.com/RealImage/bifrost
 
-go 1.22.3
+go 1.23
+
+toolchain go1.23.0
 
 require (
-	github.com/VictoriaMetrics/metrics v1.33.1
-	github.com/aws/aws-sdk-go-v2 v1.27.0
-	github.com/aws/aws-sdk-go-v2/config v1.27.16
-	github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.13.20
-	github.com/aws/aws-sdk-go-v2/service/dynamodb v1.32.6
-	github.com/aws/aws-sdk-go-v2/service/s3 v1.54.3
-	github.com/aws/aws-sdk-go-v2/service/secretsmanager v1.29.1
+	github.com/VictoriaMetrics/metrics v1.35.1
+	github.com/aws/aws-sdk-go-v2 v1.30.4
+	github.com/aws/aws-sdk-go-v2/config v1.27.28
+	github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.14.11
+	github.com/aws/aws-sdk-go-v2/service/dynamodb v1.34.5
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.59.0
+	github.com/aws/aws-sdk-go-v2/service/secretsmanager v1.32.5
 	github.com/felixge/httpsnoop v1.0.4
 	github.com/google/uuid v1.6.0
 	github.com/timewasted/go-accept-headers v0.0.0-20130320203746-c78f304b1b09
 	github.com/urfave/cli/v3 v3.0.0-alpha9
-	golang.org/x/net v0.23.0
 )
 
 require (
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.2 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.17.16 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.3 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.7 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.7 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.7 // indirect
-	github.com/aws/aws-sdk-go-v2/service/dynamodbstreams v1.20.8 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.2 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.3.9 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.9 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.17.7 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.20.9 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.24.3 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.28.10 // indirect
-	github.com/aws/smithy-go v1.20.2 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.4 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.28 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.12 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.16 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.16 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.1 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.16 // indirect
+	github.com/aws/aws-sdk-go-v2/service/dynamodbstreams v1.22.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.3.18 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.18 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.17.16 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.22.5 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.26.5 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.30.4 // indirect
+	github.com/aws/smithy-go v1.20.4 // indirect
 	github.com/valyala/fastrand v1.1.0 // indirect
 	github.com/valyala/histogram v1.2.0 // indirect
 	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
-	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/sys v0.24.0 // indirect
 )

go.sum

@@ -1,57 +1,55 @@
-github.com/VictoriaMetrics/metrics v1.33.1 h1:CNV3tfm2Kpv7Y9W3ohmvqgFWPR55tV2c7M2U6OIo+UM=
-github.com/VictoriaMetrics/metrics v1.33.1/go.mod h1:r7hveu6xMdUACXvB8TYdAj8WEsKzWB0EkpJN+RDtOf8=
-github.com/aws/aws-sdk-go-v2 v1.27.0 h1:7bZWKoXhzI+mMR/HjdMx8ZCC5+6fY0lS5tr0bbgiLlo=
-github.com/aws/aws-sdk-go-v2 v1.27.0/go.mod h1:ffIFB97e2yNsv4aTSGkqtHnppsIJzw7G7BReUZ3jCXM=
-github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.2 h1:x6xsQXGSmW6frevwDA+vi/wqhp1ct18mVXYN08/93to=
-github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.2/go.mod h1:lPprDr1e6cJdyYeGXnRaJoP4Md+cDBvi2eOj00BlGmg=
-github.com/aws/aws-sdk-go-v2/config v1.27.16 h1:knpCuH7laFVGYTNd99Ns5t+8PuRjDn4HnnZK48csipM=
-github.com/aws/aws-sdk-go-v2/config v1.27.16/go.mod h1:vutqgRhDUktwSge3hrC3nkuirzkJ4E/mLj5GvI0BQas=
-github.com/aws/aws-sdk-go-v2/credentials v1.17.16 h1:7d2QxY83uYl0l58ceyiSpxg9bSbStqBC6BeEeHEchwo=
-github.com/aws/aws-sdk-go-v2/credentials v1.17.16/go.mod h1:Ae6li/6Yc6eMzysRL2BXlPYvnrLLBg3D11/AmOjw50k=
-github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.13.20 h1:Tb9z3/GkyjD16ngZBZjOAsOXvKSkBKahQm37SCxOXhY=
-github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.13.20/go.mod h1:43wfYl5jBLYjUoZcmW4OzbXKe38VvaMYNXp2+oIwREg=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.3 h1:dQLK4TjtnlRGb0czOht2CevZ5l6RSyRWAnKeGd7VAFE=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.3/go.mod h1:TL79f2P6+8Q7dTsILpiVST+AL9lkF6PPGI167Ny0Cjw=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.7 h1:lf/8VTF2cM+N4SLzaYJERKEWAXq8MOMpZfU6wEPWsPk=
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-github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 h1:hT8rVHwugYE2lEfdFE0QWVo81lF7jMrYJVDWI+f+VxU=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0/go.mod h1:8tu/lYfQfFe6IGnaOdrpVgEL2IrrDOf6/m9RQum4NkY=
-github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.7 h1:/FUtT3xsoHO3cfh+I/kCbcMCN98QZRsiFet/V8QkWSs=
-github.com/aws/aws-sdk-go-v2/internal/v4a v1.3.7/go.mod h1:MaCAgWpGooQoCWZnMur97rGn5dp350w2+CeiV5406wE=
-github.com/aws/aws-sdk-go-v2/service/dynamodb v1.32.6 h1:170E8A7abwLNy8wF53Wu496IaIlQ+DYQLgCbTqhYf/M=
-github.com/aws/aws-sdk-go-v2/service/dynamodb v1.32.6/go.mod h1:uNhUf9Z3MT6Ex+u0ADa8r3MKK5zjuActEfXQPo4YqEI=
-github.com/aws/aws-sdk-go-v2/service/dynamodbstreams v1.20.8 h1:PapW7iWHqua6Gk+qRjgXpM3fNqUxY3N+1WURHPcmKhc=
-github.com/aws/aws-sdk-go-v2/service/dynamodbstreams v1.20.8/go.mod h1:IL6qnQxrc/qIjwzeg7USP3P7ySEehOPpXJslRbXNYJ4=
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-github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.3.9 h1:UXqEWQI0n+q0QixzU0yUUQBZXRd5037qdInTIHFTl98=
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+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.18 h1:tJ5RnkHCiSH0jyd6gROjlJtNwov0eGYNz8s8nFcR0jQ=
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+github.com/aws/aws-sdk-go-v2/service/secretsmanager v1.32.5 h1:UDXu9dqpCZYonj7poM4kFISjzTdWI0v3WUusM+w+Gfc=
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+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.26.5/go.mod h1:20sz31hv/WsPa3HhU3hfrIet2kxM4Pe0r20eBZ20Tac=
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+github.com/aws/smithy-go v1.20.4/go.mod h1:irrKGvNn1InZwb2d7fkIRNucdfwR8R+Ts3wxYa/cJHg=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
 github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
-github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
@@ -66,9 +64,7 @@ github.com/valyala/histogram v1.2.0 h1:wyYGAZZt3CpwUiIb9AU/Zbllg1llXyrtApRS815OL
 github.com/valyala/histogram v1.2.0/go.mod h1:Hb4kBwb4UxsaNbbbh+RRz8ZR6pdodR57tzWUS3BUzXY=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 h1:gEOO8jv9F4OT7lGCjxCBTO/36wtF6j2nSip77qHd4x4=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1/go.mod h1:Ohn+xnUBiLI6FVj/9LpzZWtj1/D6lUovWYBkxHVV3aM=
-golang.org/x/net v0.23.0 h1:7EYJ93RZ9vYSZAIb2x3lnuvqO5zneoD6IvWjuhfxjTs=
-golang.org/x/net v0.23.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
-golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
-golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
+golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

tinyca/ca.go

@@ -39,7 +39,7 @@ type CA struct {
 
 	cert *bifrost.Certificate
 	key  *bifrost.PrivateKey
-	gh   *gauntletHolder
+	gh   *gauntletThrower
 
 	// metrics
 	requests      *metrics.Counter
@@ -68,7 +68,7 @@ func New(
 	ca := CA{
 		cert: cert,
 		key:  key,
-		gh:   newGauntletHolder(gauntlet, cert.Namespace),
+		gh:   newGauntletThrower(gauntlet, cert.Namespace),
 
 		requests:      bifrost.StatsForNerds.GetOrCreateCounter(reqs),
 		issuedTotal:   bifrost.StatsForNerds.GetOrCreateCounter(issued),