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| 1 | package boxid |
| 2 | |
| 3 | import ( |
| 4 | "crypto/x509" |
| 5 | "embed" |
| 6 | "encoding/pem" |
| 7 | "fmt" |
| 8 | "strings" |
| 9 | ) |
| 10 | |
| 11 | //go:embed certs/*.pem |
| 12 | var certFS embed.FS |
| 13 | |
| 14 | // EmbeddedCerts returns AWS's instance-identity signing certificates by |
| 15 | // region, from certs/<aws-region>.pem. A region with no file has no |
| 16 | // certificate, so its boxes never verify: that is the safe default. |
| 17 | func EmbeddedCerts() (map[string]*x509.Certificate, error) { |
| 18 | entries, err := certFS.ReadDir("certs") |
| 19 | if err != nil { |
| 20 | return nil, err |
| 21 | } |
| 22 | out := map[string]*x509.Certificate{} |
| 23 | for _, e := range entries { |
| 24 | region, ok := strings.CutSuffix(e.Name(), ".pem") |
| 25 | if !ok { |
| 26 | continue |
| 27 | } |
| 28 | raw, err := certFS.ReadFile("certs/" + e.Name()) |
| 29 | if err != nil { |
| 30 | return nil, err |
| 31 | } |
| 32 | block, _ := pem.Decode(raw) |
| 33 | if block == nil { |
| 34 | return nil, fmt.Errorf("boxid: certs/%s is not PEM", e.Name()) |
| 35 | } |
| 36 | cert, err := x509.ParseCertificate(block.Bytes) |
| 37 | if err != nil { |
| 38 | return nil, fmt.Errorf("boxid: certs/%s: %w", e.Name(), err) |
| 39 | } |
| 40 | out[region] = cert |
| 41 | } |
| 42 | return out, nil |
| 43 | } |
| 44 | |
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