273 lines
8.2 KiB
Go
273 lines
8.2 KiB
Go
package certificate
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import (
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"context"
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"crypto/sha256"
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"crypto/tls"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"fmt"
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"net"
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"net/url"
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"os"
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"strings"
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"time"
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)
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// ValidationResult 保存证书校验后的关键元数据。
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type ValidationResult struct {
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Domains []string `json:"domains"`
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SerialNumber string `json:"serial_number"`
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FingerprintSHA256 string `json:"fingerprint_sha256"`
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NotBefore time.Time `json:"not_before"`
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NotAfter time.Time `json:"not_after"`
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ChainLength int `json:"chain_length"`
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}
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// LocalValidator 校验本地证书、私钥和证书链。
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type LocalValidator struct {
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Roots *x509.CertPool
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Now func() time.Time
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VerifyChain bool
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}
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// ValidateFiles 校验证书文件、私钥文件以及期望覆盖的域名。
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func (v LocalValidator) ValidateFiles(ctx context.Context, certificatePath, fullChainPath, privateKeyPath string, expectedDomains []string) (ValidationResult, error) {
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if err := ctx.Err(); err != nil {
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return ValidationResult{}, err
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}
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certificateData, err := os.ReadFile(certificatePath)
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if err != nil {
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return ValidationResult{}, fmt.Errorf("读取证书文件失败：%w", err)
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}
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chainData := certificateData
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if strings.TrimSpace(fullChainPath) != "" {
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chainData, err = os.ReadFile(fullChainPath)
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if err != nil {
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return ValidationResult{}, fmt.Errorf("读取完整证书链失败：%w", err)
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}
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}
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privateKeyData, err := os.ReadFile(privateKeyPath)
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if err != nil {
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return ValidationResult{}, fmt.Errorf("读取私钥文件失败：%w", err)
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}
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if _, err := tls.X509KeyPair(chainData, privateKeyData); err != nil {
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return ValidationResult{}, fmt.Errorf("证书与私钥不匹配：%w", err)
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}
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return v.validatePEM(ctx, chainData, expectedDomains)
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}
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// ValidatePEM 校验内存中的证书链和期望域名。
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func (v LocalValidator) ValidatePEM(ctx context.Context, chainData []byte, expectedDomains []string) (ValidationResult, error) {
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return v.validatePEM(ctx, chainData, expectedDomains)
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}
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func (v LocalValidator) validatePEM(ctx context.Context, chainData []byte, expectedDomains []string) (ValidationResult, error) {
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if err := ctx.Err(); err != nil {
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return ValidationResult{}, err
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}
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certificates, err := parseCertificates(chainData)
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if err != nil {
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return ValidationResult{}, err
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}
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leaf := certificates[0]
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wanted, err := normalizeValidationNames(expectedDomains)
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if err != nil {
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return ValidationResult{}, err
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}
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now := time.Now().UTC()
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if v.Now != nil {
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now = v.Now().UTC()
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}
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if now.Before(leaf.NotBefore) || !now.Before(leaf.NotAfter) {
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return ValidationResult{}, fmt.Errorf("证书当前不在有效期内：%s 至 %s", leaf.NotBefore.UTC().Format(time.RFC3339), leaf.NotAfter.UTC().Format(time.RFC3339))
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}
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for _, name := range wanted {
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probe := name
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if strings.HasPrefix(probe, "*.") {
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probe = "scert-wildcard-probe." + strings.TrimPrefix(probe, "*.")
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}
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if err := leaf.VerifyHostname(probe); err != nil {
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return ValidationResult{}, fmt.Errorf("证书不覆盖域名 %s：%w", name, err)
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}
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}
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if v.VerifyChain {
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if err := verifyChain(certificates, v.Roots, now); err != nil {
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return ValidationResult{}, err
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}
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}
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return validationResult(leaf, len(certificates)), nil
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}
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// RemoteValidator 校验远程 HTTPS 服务实际返回的证书。
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type RemoteValidator struct {
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Roots *x509.CertPool
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Dialer *net.Dialer
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Timeout time.Duration
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Now func() time.Time
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}
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// ValidateHTTPS 连接目标 HTTPS 地址并校验证书链和域名。
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func (v RemoteValidator) ValidateHTTPS(ctx context.Context, endpoint string, expectedDomains []string) (ValidationResult, error) {
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target, err := normalizeHTTPSURL(endpoint)
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if err != nil {
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return ValidationResult{}, err
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}
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parsed, err := url.Parse(target)
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if err != nil {
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return ValidationResult{}, fmt.Errorf("解析 HTTPS 地址失败：%w", err)
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}
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address := parsed.Host
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if _, _, splitErr := net.SplitHostPort(address); splitErr != nil {
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address = net.JoinHostPort(parsed.Hostname(), "443")
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}
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dialer := v.Dialer
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if dialer == nil {
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dialer = &net.Dialer{Timeout: v.timeout()}
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}
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ctx, cancel := context.WithTimeout(ctx, v.timeout())
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defer cancel()
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tlsDialer := &tls.Dialer{
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NetDialer: dialer,
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Config: &tls.Config{
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ServerName: parsed.Hostname(),
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MinVersion: tls.VersionTLS12,
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InsecureSkipVerify: true,
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},
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}
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connection, err := tlsDialer.DialContext(ctx, "tcp", address)
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if err != nil {
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return ValidationResult{}, fmt.Errorf("remote HTTPS connection failed: %w", err)
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}
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tlsConnection, ok := connection.(*tls.Conn)
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if !ok {
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_ = connection.Close()
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return ValidationResult{}, errors.New("remote HTTPS connection type is invalid")
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}
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defer tlsConnection.Close()
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state := tlsConnection.ConnectionState()
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if len(state.PeerCertificates) == 0 {
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return ValidationResult{}, errors.New("远程 HTTPS 服务未返回证书")
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}
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certificates := make([]*x509.Certificate, len(state.PeerCertificates))
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copy(certificates, state.PeerCertificates)
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wanted := expectedDomains
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if len(wanted) == 0 {
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wanted = []string{parsed.Hostname()}
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}
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chainData := make([]byte, 0)
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for _, certificate := range certificates {
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chainData = append(chainData, pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certificate.Raw})...)
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}
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validator := LocalValidator{Roots: v.Roots, Now: v.Now, VerifyChain: true}
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return validator.ValidatePEM(ctx, chainData, wanted)
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}
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func (v RemoteValidator) timeout() time.Duration {
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if v.Timeout > 0 {
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return v.Timeout
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}
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return 10 * time.Second
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}
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func normalizeHTTPSURL(value string) (string, error) {
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value = strings.TrimSpace(value)
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if value == "" {
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return "", errors.New("HTTPS 地址不能为空")
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}
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if !strings.Contains(value, "://") {
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value = "https://" + value
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}
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parsed, err := url.Parse(value)
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if err != nil || parsed.Scheme != "https" || parsed.Hostname() == "" {
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return "", errors.New("HTTPS 地址格式无效")
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}
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return parsed.String(), nil
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}
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func normalizeValidationNames(values []string) ([]string, error) {
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seen := make(map[string]struct{}, len(values))
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result := make([]string, 0, len(values))
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for _, value := range values {
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value = strings.ToLower(strings.TrimSuffix(strings.TrimSpace(value), "."))
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if value == "" {
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continue
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}
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if net.ParseIP(strings.TrimPrefix(value, "*.")) == nil && !validDomain(value) {
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return nil, fmt.Errorf("证书校验域名无效：%s", value)
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}
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if _, exists := seen[value]; exists {
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continue
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}
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seen[value] = struct{}{}
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result = append(result, value)
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}
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if len(result) == 0 {
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return nil, errors.New("证书校验域名不能为空")
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}
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return result, nil
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}
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func parseCertificates(data []byte) ([]*x509.Certificate, error) {
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remaining := data
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certificates := make([]*x509.Certificate, 0, 2)
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for len(remaining) > 0 {
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block, rest := pem.Decode(remaining)
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if block == nil {
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break
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}
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remaining = rest
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if block.Type != "CERTIFICATE" {
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continue
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}
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certificate, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return nil, fmt.Errorf("解析证书链失败：%w", err)
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}
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certificates = append(certificates, certificate)
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}
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if len(certificates) == 0 {
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return nil, errors.New("未找到 PEM 证书链")
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}
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return certificates, nil
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}
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func verifyChain(certificates []*x509.Certificate, roots *x509.CertPool, now time.Time) error {
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if roots == nil {
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var err error
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roots, err = x509.SystemCertPool()
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if err != nil || roots == nil {
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roots = x509.NewCertPool()
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}
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}
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intermediates := x509.NewCertPool()
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for _, certificate := range certificates[1:] {
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if !certificate.IsCA {
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continue
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}
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intermediates.AddCert(certificate)
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}
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_, err := certificates[0].Verify(x509.VerifyOptions{
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Roots: roots,
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Intermediates: intermediates,
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DNSName: "",
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CurrentTime: now,
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KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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})
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if err != nil {
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return fmt.Errorf("证书链校验失败：%w", err)
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}
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return nil
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}
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func validationResult(leaf *x509.Certificate, chainLength int) ValidationResult {
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return ValidationResult{
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Domains: append([]string(nil), leaf.DNSNames...),
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SerialNumber: leaf.SerialNumber.Text(16),
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FingerprintSHA256: fmt.Sprintf("%X", sha256.Sum256(leaf.Raw)),
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NotBefore: leaf.NotBefore,
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NotAfter: leaf.NotAfter,
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ChainLength: chainLength,
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}
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}
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