feat(09-05): implement convertCert + wire POST /convert (GREEN)
- Add FileResponse interface and FORMAT_MIME map to service
- Implement convertCert: parses any input format (PEM/DER/PFX/P7B) via
same logic as parseCert; serializes to pem/der/p7b targetFormat
- DER output uses bytesToHex→Buffer.from(hex,'hex') to avoid utf-8
corruption (Pitfall 1 / T-09-06)
- P7B output: pkcs7.createSignedData + pem.encode (PEM-wrapped PKCS7)
- Wrap all forge ops in try/catch → BadRequestException (T-09-01)
- Controller: add @Body('pemText') + reject when neither file nor pemText
- Fix: re-add NotImplementedException import for mergeCerts stub
- All 23 API cert-manager tests green (including 4 new convertCert)
This commit is contained in:
@@ -36,6 +36,26 @@ export interface SplitResponse {
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certs: SplitEntry[];
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}
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// ---------------------------------------------------------------------------
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// FileResponse — the structured result returned by convertCert / mergeCerts
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// ---------------------------------------------------------------------------
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export interface FileResponse {
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/** Suggested download filename, e.g. "converted.der" */
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filename: string;
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/** Base64-encoded file content */
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content: string;
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/** MIME type for the download */
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mimeType: string;
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}
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/** Map from target format key to MIME type */
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const FORMAT_MIME: Record<string, string> = {
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pem: 'application/x-pem-file',
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der: 'application/x-x509-ca-cert',
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p7b: 'application/x-pkcs7-certificates',
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};
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// ---------------------------------------------------------------------------
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// Reverse OID map (OID string -> human-readable algorithm name)
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// Built once at module load — node-forge's pki.oids is name->OID
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@@ -373,12 +393,130 @@ export class CertManagerService {
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throw new NotImplementedException('mergeCerts is not yet implemented');
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}
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async convertCert(_input: {
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/**
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* Convert a certificate between PEM, DER, and P7B formats.
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*
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* Security contract (T-09-01, T-09-06):
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* - All forge calls wrapped in try/catch → BadRequestException on malformed input
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* - DER output built via bytesToHex → Buffer.from(hex, 'hex') → base64 (never utf-8 round-trip)
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* - Password is never passed to the logger (T-09-02)
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*/
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async convertCert(input: {
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file?: any;
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pemText?: string;
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targetFormat: string;
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password?: string;
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}): Promise<never> {
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throw new NotImplementedException('convertCert is not yet implemented');
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}): Promise<FileResponse> {
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const { file, pemText, targetFormat, password } = input;
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// ── Validate targetFormat ──────────────────────────────────────────────
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if (!FORMAT_MIME[targetFormat]) {
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throw new BadRequestException(
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`Unsupported target format: "${targetFormat}". Supported: pem, der, p7b`,
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);
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}
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let cert: forge.pki.Certificate;
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try {
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// ── Resolve input to a forge Certificate ────────────────────────────
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if (pemText) {
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// PEM text pasted by the user
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const certs = this.parsePemChain(pemText);
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if (certs.length === 0) {
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throw new Error('No certificate block found in PEM text');
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}
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cert = certs[0];
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} else if (file) {
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const format = this.detectFormat(file.originalname as string, file.buffer as Buffer);
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if (format === 'pem') {
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const pemStr = (file.buffer as Buffer).toString('utf-8');
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const certs = this.parsePemChain(pemStr);
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if (certs.length === 0) {
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throw new Error('No certificate block found in PEM file');
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}
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cert = certs[0];
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} else if (format === 'der') {
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// CRITICAL: binary encoding, never utf-8 (RESEARCH Pitfall 1)
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const asn1 = forge.asn1.fromDer(this.toForgeBuffer(file.buffer as Buffer));
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cert = forge.pki.certificateFromAsn1(asn1);
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} else if (format === 'pfx') {
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// PFX/PKCS12 — extract first cert bag (wrong password → BadRequestException)
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const p12Asn1 = forge.asn1.fromDer(this.toForgeBuffer(file.buffer as Buffer));
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const p12 = forge.pkcs12.pkcs12FromAsn1(p12Asn1, password ?? '');
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const certBags = p12.getBags({ bagType: forge.pki.oids.certBag });
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const bags = certBags[forge.pki.oids.certBag] ?? [];
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if (bags.length === 0) {
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throw new Error('No certificate bag found in PFX/PKCS12');
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}
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cert = bags[0].cert!;
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} else {
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// P7B — extract first cert
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const isPemP7b = (file.buffer as Buffer)
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.slice(0, 27)
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.toString('ascii')
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.includes('-----BEGIN');
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let p7: any;
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if (isPemP7b) {
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p7 = forge.pkcs7.messageFromPem((file.buffer as Buffer).toString('utf-8'));
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} else {
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const p7Asn1 = forge.asn1.fromDer(this.toForgeBuffer(file.buffer as Buffer));
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p7 = forge.pkcs7.messageFromAsn1(p7Asn1);
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}
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const p7Certs: forge.pki.Certificate[] = p7.certificates ?? [];
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if (p7Certs.length === 0) {
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throw new Error('No certificate found in P7B/PKCS7');
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}
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cert = p7Certs[0];
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}
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} else {
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throw new BadRequestException('No file or PEM text provided');
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}
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} catch (err) {
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if (err instanceof BadRequestException) throw err;
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// Password never logged (T-09-02)
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this.logger.warn('convertCert: failed to parse input certificate');
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throw new BadRequestException(
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'Failed to parse certificate: invalid format or wrong password',
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);
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}
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// ── Serialize to targetFormat ─────────────────────────────────────────
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try {
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let content: string;
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if (targetFormat === 'pem') {
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// PEM text → base64 via utf-8
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const pemOut = forge.pki.certificateToPem(cert);
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content = Buffer.from(pemOut, 'utf-8').toString('base64');
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} else if (targetFormat === 'der') {
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// DER binary — CRITICAL: bytesToHex → Buffer.from(hex, 'hex') → base64
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// Avoids utf-8 round-trip corruption (RESEARCH Pitfall 1 / T-09-06)
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const derHex = forge.util.bytesToHex(
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forge.asn1.toDer(forge.pki.certificateToAsn1(cert)).getBytes(),
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);
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content = Buffer.from(derHex, 'hex').toString('base64');
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} else {
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// P7B — PEM-wrapped PKCS7 SignedData containing the certificate
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const p7 = forge.pkcs7.createSignedData();
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p7.addCertificate(cert);
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const p7DerBytes = forge.asn1.toDer(p7.toAsn1()).getBytes();
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const p7PemStr = forge.pem.encode({ type: 'PKCS7', body: p7DerBytes });
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content = Buffer.from(p7PemStr, 'utf-8').toString('base64');
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}
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return {
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filename: `converted.${targetFormat}`,
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content,
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mimeType: FORMAT_MIME[targetFormat],
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};
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} catch (err) {
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this.logger.warn('convertCert: failed to serialize to target format');
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throw new BadRequestException(
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`Failed to convert certificate to ${targetFormat}: serialization error`,
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);
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}
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}
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// ---------------------------------------------------------------------------
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