From bbc3d5af8289eb976c9c236813f0482c1f3b687c Mon Sep 17 00:00:00 2001 From: Nick Chambers Date: Sun, 15 May 2022 04:37:56 -0500 Subject: [PATCH] Add a utility for building X.509 chains --- go/linksmith.go | 393 ++++++++++++++++++++++++++++++++++++++++++++++++ go/roots.pem | 165 ++++++++++++++++++++ 2 files changed, 558 insertions(+) create mode 100644 go/linksmith.go create mode 100644 go/roots.pem diff --git a/go/linksmith.go b/go/linksmith.go new file mode 100644 index 0000000..946fef5 --- /dev/null +++ b/go/linksmith.go @@ -0,0 +1,393 @@ +package main + +import ( + "crypto/x509" + _ "embed" + "encoding/base64" + "errors" + "flag" + "fmt" + "io" + "io/ioutil" + "net/http" + "os" + "regexp" + "runtime" + "strings" +) + +type Certificate struct { + Store *x509.Certificate +} + +func LoadCertFromDER(der []byte) (Certificate, error) { + cert := Certificate { Store: nil } + store, err := x509.ParseCertificate(der) + + if err != nil { + return cert, err + } + + cert.Store = store + return cert, nil +} + +func LoadCertFromPEM(pem string) (Certificate, error) { + cert := Certificate { Store: nil } + + if ! strings.HasPrefix(pem, "-----BEGIN CERTIFICATE-----") { + return cert, errors.New("invalid certificate header") + } else if ! strings.HasSuffix(pem, "-----END CERTIFICATE-----") { + return cert, errors.New("invalid certificate footer") + } + + encoded := strings.Split(pem, "\n") + data := strings.Join(encoded[1:len(encoded) - 1], "\n") + bytes, err := base64.StdEncoding.DecodeString(data) + + if err != nil { + return cert, err + } + + store, err := x509.ParseCertificate(bytes) + + if err != nil { + return cert, err + } + + cert.Store = store + return cert, nil +} + +func (cert Certificate) ToPEM() string { + pem_export := "-----BEGIN CERTIFICATE-----\n" + encoded := base64.StdEncoding.EncodeToString(cert.Store.Raw) + idx := 0 + + for idx < len(encoded) { + if idx + 64 < len(encoded) { + pem_export += encoded[idx:idx + 64] + "\n" + } else { + pem_export += encoded[idx:] + "\n" + } + + idx += 64 + } + + pem_export += "-----END CERTIFICATE-----" + return pem_export +} + +func (cert Certificate) IsSelfSigned() bool { + err := cert.Store.CheckSignatureFrom(cert.Store) + return err == nil +} + +func (cert Certificate) IsRoot() bool { + return cert.IsSelfSigned() && cert.Store.IsCA +} + +func (cert Certificate) IsIntermediate() bool { + err := cert.Store.CheckSignatureFrom(cert.Store) + return err == nil && cert.Store.IsCA +} + +func (cert Certificate) IsLeaf() bool { + if cert.Store.IsCA { + return false + } + + allowed_uses := []x509.ExtKeyUsage { + x509.ExtKeyUsageAny, x509.ExtKeyUsageServerAuth, + x509.ExtKeyUsageClientAuth, + } + + for _, use := range cert.Store.ExtKeyUsage { + good_use := false + + for _, allowed := range allowed_uses { + if use == allowed { + good_use = true + } + } + + if ! good_use { + return false + } + } + + return true +} + +func (cert Certificate) GetHTTPAuthorityURL() (string, bool) { + for _, url := range cert.Store.IssuingCertificateURL { + if strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") { + return url, true + } + } + + return "", false +} + +func (cert Certificate) Parent(parent Certificate) bool { + return cert.Store.CheckSignatureFrom(parent.Store) == nil +} + +type CertificateChain struct { + Certificates []Certificate + Leaf, Root *Certificate +} + +func LoadCertsFromPEM(pem string) (CertificateChain, error) { + chain := CertificateChain { + Certificates: []Certificate { }, Leaf: nil, Root: nil, + } + + parser, err := regexp.Compile("-----BEGIN CERTIFICATE-----\r?\n([A-Za-z0-9/+=\r\n]+)\r?\n-----END CERTIFICATE-----") + + if err != nil { + return chain, err + } + + matches := parser.FindAllStringSubmatch(string(pem), -1) + + for _, match := range matches { + cert, err := LoadCertFromPEM(match[0]) + + if err != nil { + return chain, err + } + + chain.Certificates = append(chain.Certificates, cert) + chain.Root = &chain.Certificates[len(chain.Certificates) - 1] + } + + if len(chain.Certificates) == 0 { + return chain, errors.New("no certificates found") + } + + chain.Leaf = &chain.Certificates[0] + return chain, nil +} + +//go:embed roots.pem +var BAKED_IN_ROOTS string + +func LoadSystemStore() (CertificateChain, error) { + cert_path := "" + + if path, has := os.LookupEnv("SSL_CERT_FILE"); has { + cert_path = path + } else if runtime.GOOS == "linux" { + cert_path = "/etc/ssl/certs/ca-certificates.crt" + } else if runtime.GOOS == "darwin" { + cert_path = "/etc/ssl/cert.pem" + } + + if cert_path == "" { + return LoadCertsFromPEM(BAKED_IN_ROOTS) + } + + pem, err := os.ReadFile(cert_path) + + if err != nil { + return CertificateChain { }, err + } + + return LoadCertsFromPEM(string(pem)) +} + +func (chain CertificateChain) ToPEM() string { + pem_export := "" + + for _, link := range chain.Certificates { + pem_export += link.ToPEM() + "\n" + } + + return pem_export +} + +func (chain *CertificateChain) Prepend(cert Certificate) { + chain.Certificates = append([]Certificate { cert }, chain.Certificates...) + chain.Leaf = &chain.Certificates[0] +} + +func (chain *CertificateChain) Append(cert Certificate) { + chain.Certificates = append(chain.Certificates, cert) + chain.Root = &chain.Certificates[len(chain.Certificates) - 1] +} + +func (chain CertificateChain) IsLinked() bool { + for idx, link := range chain.Certificates[1:] { + err := chain.Certificates[idx].Store.CheckSignatureFrom(link.Store) + + if err != nil { + return false + } + } + + return true +} + +func (chain CertificateChain) IsComplete(test_links ...bool) bool { + if len(test_links) > 0 && test_links[0] { + return chain.Root.IsRoot() && chain.Leaf.IsLeaf() && chain.IsLinked() + } else { + return chain.Root.IsRoot() && chain.Leaf.IsLeaf() + } +} + +func (chain CertificateChain) Links() int { + return len(chain.Certificates) +} + +func main() { + has_sys_pool := true + sys_pool, err := LoadSystemStore() + + if err != nil { + fmt.Fprintf(os.Stderr, "error: unable to load system pool: %s\n", err) + has_sys_pool = false + } + + flag.Parse() + args := flag.Args() + + for _, arg := range args { + pem, err := os.ReadFile(arg) + + if err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + fmt.Fprintf(os.Stderr, "%s: skipping file...\n", arg) + continue + } + + chain, err := LoadCertsFromPEM(string(pem)) + + if err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + fmt.Fprintf(os.Stderr, "%s: skipping file...\n", arg) + continue + } else if chain.Leaf.IsSelfSigned() { + fmt.Fprintf(os.Stderr, "%s: certificate is self-signed\n", arg) + fmt.Fprintf(os.Stderr, "%s: skipping file...\n", arg) + continue + } else if ! chain.IsLinked() { + fmt.Fprintf(os.Stderr, "%s: error: certificates do not form a chain\n", arg) + fmt.Fprintf(os.Stderr, "%s: skipping file...\n", arg) + continue + } + + for ! chain.Root.IsRoot() { + found_link := false + aia_url, found_url := chain.Root.GetHTTPAuthorityURL() + + if found_url { + res, err := http.Get(aia_url) + + if err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + + if ! has_sys_pool { + fmt.Fprintf(os.Stderr, "%s: attempting alternate chain discovery methods\n", arg) + } + } else { + cert_data, err := io.ReadAll(res.Body) + + if err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + + if ! has_sys_pool { + fmt.Fprintf(os.Stderr, "%s: attempting alternate chain discovery methods\n", arg) + } + } else { + cert := Certificate { Store: nil } + mime := "der" + + switch res.Header.Get("content-type") { + case "application/pkix-cer": mime = "der" + case "application/pkix-cert": mime = "der" + case "application/x-x509-ca-cert": mime = "der" + case "application/x-pem-file": mime = "pem" + } + + if strings.HasSuffix(aia_url, ".der") || mime == "der" { + link, err := LoadCertFromDER(cert_data) + + if err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + + if ! has_sys_pool { + fmt.Fprintf(os.Stderr, "%s: attempting alternate chain discovery methods\n", arg) + } + } else { + cert = link + found_link = true + } + } else if strings.HasSuffix(aia_url, ".pem") || mime == "pem" { + link, err := LoadCertFromPEM(string(cert_data)) + + if err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + + if ! has_sys_pool { + fmt.Fprintf(os.Stderr, "%s: attempting alternate chain discovery methods\n", arg) + } + } else { + cert = link + found_link = true + } + } + + if found_link { + chain.Append(cert) + } else { + fmt.Fprintf(os.Stderr, "%s: unable to determine link file type\n", arg) + + if ! has_sys_pool { + fmt.Fprintf(os.Stderr, "%s: attempting alternate chain discovery methods\n", arg) + } + } + } + + res.Body.Close() + } + } + + if ! found_link && has_sys_pool { + for _, sys_cert := range sys_pool.Certificates { + if chain.Root.Parent(sys_cert) { + chain.Append(sys_cert) + found_link = true + break + } + } + } + + if ! found_link { + break + } + } + + if chain.IsComplete(true) { + file, err := ioutil.TempFile("", "*-chain.pem") + + if err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + fmt.Fprintf(os.Stderr, "%s: skipping file...\n", arg) + } else { + if _, err := file.Write([]byte(chain.ToPEM())); err != nil { + fmt.Fprintf(os.Stderr, "%s: error: %s\n", arg, err) + fmt.Fprintf(os.Stderr, "%s: skipping file...\n", arg) + } else { + fmt.Printf("%s: complete chain has been saved to %s\n", arg, file.Name()) + } + + file.Close() + } + } else { + fmt.Fprintf(os.Stderr, "%s: unable to determine next link in chain\n", arg) + fmt.Fprintf(os.Stderr, "%s: skipping file...\n", arg) + } + } +} diff --git a/go/roots.pem b/go/roots.pem new file mode 100644 index 0000000..342e61e --- /dev/null +++ b/go/roots.pem @@ -0,0 +1,165 @@ +-----BEGIN CERTIFICATE----- +MIIDxTCCAq2gAwIBAgIBADANBgkqhkiG9w0BAQsFADCBgzELMAkGA1UEBhMCVVMx +EDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNjb3R0c2RhbGUxGjAYBgNVBAoT +EUdvRGFkZHkuY29tLCBJbmMuMTEwLwYDVQQDEyhHbyBEYWRkeSBSb290IENlcnRp 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