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Comment:Reordered get parameters in Tls_NewX509Obj to follow RFC 5280 section order. Added get self issued, Key usage, Extended Key usage, and purpose values. Added more comments, optimized code, etc.
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SHA3-256: 10bcd4c88f0314ff9798ddc6b21dcabc9147f9b423d63199f36aee8c670e44e7
User & Date: bohagan on 2023-08-10 03:16:43
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Context
2023-08-12
03:34
Refactored X509 code to consolidate like functions, eliminate many buffers, etc Added function BIO_to_Buffer to consolidate copy BIO data to buffer. Moved get all data and certificate to end of function. check-in: a1bcda35b1 user: bohagan tags: status_x509
2023-08-10
03:16
Reordered get parameters in Tls_NewX509Obj to follow RFC 5280 section order. Added get self issued, Key usage, Extended Key usage, and purpose values. Added more comments, optimized code, etc. check-in: 10bcd4c88f user: bohagan tags: status_x509
2023-08-07
03:27
Added Issuer Alt Name to X509 status, refactored get SAN and CRL check-in: 35be4894ce user: bohagan tags: status_x509
Changes
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Modified generic/tls.c from [876a0b1ced] to [5b3a9ccd27].

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    /* Get certificate for peer or self */
    if (objc == 2) {
	peer = SSL_get_peer_certificate(statePtr->ssl);
    } else {
	peer = SSL_get_certificate(statePtr->ssl);
    }
    /* Get X509 certificate info */
    if (peer) {
	objPtr = Tls_NewX509Obj(interp, peer);
	if (objc == 2) { X509_free(peer); }
	if (objc == 2) {
	    X509_free(peer);
	    peer = NULL;
	}
    } else {
	objPtr = Tcl_NewListObj(0, NULL);
    }

    /* Peer cert chain (client only) */
    STACK_OF(X509)* ssl_certs = SSL_get_peer_cert_chain(statePtr->ssl);
    if (!peer && (ssl_certs == NULL || sk_X509_num(ssl_certs) == 0)) {
    if (ssl_certs == NULL || sk_X509_num(ssl_certs) == 0) {
	Tcl_SetErrorCode(interp, "TLS", "STATUS", "CERTIFICATE", (char *) NULL);
	Tcl_IncrRefCount(objPtr);
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;
    }

    /* Peer name from cert */
    /* Peer name */
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("peername", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get0_peername(statePtr->ssl), -1));

    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("sbits", -1));
    Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_get_cipher_bits(statePtr->ssl, NULL)));

    ciphers = (char*)SSL_get_cipher(statePtr->ssl);
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	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("cipher", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_get_name(cipher), -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("standard_name", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_standard_name(cipher), -1));

	bits = SSL_CIPHER_get_bits(cipher, &alg_bits);
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("bits", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("secret_bits", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(bits));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("secret_bits", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("algorithm_bits", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(alg_bits));
	/* alg_bits is actual key secret bits. If use bits and secret (algorithm) bits differ,
	   the rest of the bits are fixed, i.e. for limited export ciphers (bits < 56) */
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("min_version", -1));
	Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_get_version(cipher), -1));

	/* Get OpenSSL-specific ID, not IANA ID */
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Modified generic/tlsX509.c from [581b34e1fe] to [f0d516f0c1].

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#define CERT_STR_SIZE 32768

Tcl_Obj*
Tls_NewX509Obj(Tcl_Interp *interp, X509 *cert) {
    Tcl_Obj *certPtr = Tcl_NewListObj(0, NULL);
    BIO *bio;
    int nid, pknid, bits, num_of_exts, len;
    uint32_t xflags;
    int mdnid, pknid, bits, num_of_exts, len;
    uint32_t xflags, usage;
    char subject[BUFSIZ];
    char issuer[BUFSIZ];
    char serial[BUFSIZ];
    char notBefore[BUFSIZ];
    char notAfter[BUFSIZ];
    char buffer[BUFSIZ];
    char certStr[CERT_STR_SIZE];
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	    notAfter[max(n, 0)] = 0;
	    (void)BIO_flush(bio);
	}

	BIO_free(bio);
    }

    /* Version of the encoded certificate */
    /* The certificate data */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("version", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewLongObj(X509_get_version(cert)+1));

    /* Signature algorithm used by the CA to sign the certificate. Must match signatureAlgorithm. */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("signature", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(X509_get_signature_nid(cert)),-1));

    /* SHA1 Fingerprint of cert - DER representation */
    X509_digest(cert, EVP_sha1(), md, &len);
    len = String_to_Hex(md, len, buffer, BUFSIZ);
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha1_hash", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));

    /* SHA256 Fingerprint of cert - DER representation */
    X509_digest(cert, EVP_sha256(), md, &len);
    len = String_to_Hex(md, len, buffer, BUFSIZ);
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha256_hash", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));

    /* The subject identifies the entity associated with the public key stored in the subject public key field.  */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subject", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(subject, -1));

    /* The issuer identifies the entity that has signed and issued the certificate. */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuer", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(issuer, -1));

    /* Certificate validity period is the time interval during which the CA
   warrants that it will maintain information about the status of the certificate. */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("notBefore", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(notBefore, -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("notAfter", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(notAfter, -1));

    /* Unique number assigned by CA to certificate. */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("serialNumber", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(serial, -1));

    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("certificate", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(certStr, -1));

    /* Information about the signature of certificate cert */
    /* Contains the public key and identify the algorithm with which the key is used */
    if (X509_get_signature_info(cert, &nid, &pknid, &bits, &xflags) == 1) {
	ASN1_BIT_STRING *key;

	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("signingDigest", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(nid),-1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("publicKeyAlgorithm", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(pknid),-1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("bits", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(bits));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("extension_flags", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(xflags));

	/* Public key - X509_get0_pubkey */
	key = X509_get0_pubkey_bitstr(cert);
	len = String_to_Hex(key->data, key->length, buffer, BUFSIZ);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("publicKey", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));

	/* Check if cert was issued by CA cert issuer or self signed */
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("self_signed", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewBooleanObj(X509_check_issued(cert, cert) == X509_V_OK));
    }

    /* Unique Ids -  The unique identifiers are present in the certificate to handle the
	possibility of reuse of subject and/or issuer names over time.*/
    {
	const ASN1_BIT_STRING *iuid, *suid;
        X509_get0_uids(cert, &iuid, &suid);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuerUniqueId", -1));
	if (iuid != NULL) {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj((char *)iuid->data, iuid->length));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}

	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectUniqueId", -1));
	if (suid != NULL) {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj((char *)suid->data, suid->length));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}
    }

    /* Count of extensions */
    num_of_exts = X509_get_ext_count(cert);
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("num_extensions", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(num_of_exts));

    /* Get extension names */
    if (num_of_exts > 0) {
	Tcl_Obj *extsPtr = Tcl_NewListObj(0, NULL);
	const STACK_OF(X509_EXTENSION) *exts;
	exts = X509_get0_extensions(cert);

	for (int i=0; i < num_of_exts; i++) {
	    X509_EXTENSION *ex = sk_X509_EXTENSION_value(exts, i);
	    ASN1_OBJECT *obj = X509_EXTENSION_get_object(ex);
	    unsigned nid2 = OBJ_obj2nid(obj);
	    Tcl_ListObjAppendElement(interp, extsPtr, Tcl_NewStringObj(OBJ_nid2ln(nid2), -1));
	}
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("extensions", -1));
	Tcl_ListObjAppendElement(interp, certPtr, extsPtr);
    }

    /* Certificate Alias as UTF-8 string */
    {
	unsigned char *bstring;
	len = 0;
	bstring = X509_alias_get0(cert, &len);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("alias", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj((char *)bstring, len));
    }

    /* Get Subject Key id, Authority Key id. The Authority Key Identifier (AKI) of a
	certificate should be the Subject Key Identifier (SKI) of its signer (the CA). */
    {
	/* Identifies certificates that contain a particular public key */
	ASN1_OCTET_STRING *astring;
	/* X509_keyid_get0 */
	astring = X509_get0_subject_key_id(cert);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectKeyIdentifier", -1));
	if (astring != NULL) {
	    len = String_to_Hex((char *)ASN1_STRING_get0_data(astring), ASN1_STRING_length(astring), buffer, BUFSIZ);
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}

	/* Identifies the public key corresponding to the private key used to sign a certificate */
	astring = X509_get0_authority_key_id(cert);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("authorityKeyIdentifier", -1));
	if (astring != NULL) {
	    len = String_to_Hex((char *)ASN1_STRING_get0_data(astring), ASN1_STRING_length(astring), buffer, BUFSIZ);
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}
	
	/*  const GENERAL_NAMES *X509_get0_authority_issuer(cert);
	const ASN1_INTEGER *X509_get0_authority_serial(cert); */
    }
 
    /* Signature algorithm and value */
    /* Signature algorithm and value - RFC 5280 section 4.1.1.2 and 4.1.1.3 */
    /* The signatureAlgorithm field contains the identifier for the cryptographic algorithm
	used by the CA to sign this certificate. The signatureValue field contains a digital
	signature computed upon the ASN.1 DER encoded tbsCertificate. */
    {
	const X509_ALGOR *sig_alg;
	const ASN1_BIT_STRING *sig;
	int sig_nid;
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	if (sig_nid != NID_undef) {
	    len = String_to_Hex(sig->data, sig->length, buffer, BUFSIZ);
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}
    }

    /* Version of the encoded certificate - RFC 5280 section 4.1.2.1 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("version", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewLongObj(X509_get_version(cert)+1));

    /* Unique number assigned by CA to certificate - RFC 5280 section 4.1.2.2 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("serialNumber", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(serial, -1));

    /* Signature algorithm used by the CA to sign the certificate. Must match
	signatureAlgorithm. RFC 5280 section 4.1.2.3 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("signature", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(X509_get_signature_nid(cert)),-1));

    /* The issuer identifies the entity that has signed and issued the certificate.
	RFC 5280 section 4.1.2.4 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuer", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(issuer, -1));

    /* Certificate validity period is the time interval during which the CA
	warrants that it will maintain information about the status of the certificate.
	RFC 5280 section 4.1.2.5 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("notBefore", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(notBefore, -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("notAfter", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(notAfter, -1));

    /* The subject identifies the entity associated with the public key stored
	in the subject public key field. RFC 5280 section 4.1.2.6 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subject", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(subject, -1));

    /* SHA1 Fingerprint of cert - DER representation */
    X509_digest(cert, EVP_sha1(), md, &len);
    len = String_to_Hex(md, len, buffer, BUFSIZ);
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha1_hash", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));

    /* SHA256 Fingerprint of cert - DER representation */
    X509_digest(cert, EVP_sha256(), md, &len);
    len = String_to_Hex(md, len, buffer, BUFSIZ);
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha256_hash", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));

    /* Subject Public Key Info specifies the public key and identifies the
	algorithm with which the key is used. RFC 5280 section 4.1.2.7 */
    if (X509_get_signature_info(cert, &mdnid, &pknid, &bits, &xflags) == 1) {
	ASN1_BIT_STRING *key;
	unsigned int n;

	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("signingDigest", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(mdnid),-1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("publicKeyAlgorithm", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(pknid),-1));
	/* Effective security bits */
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("bits", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(bits));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("extension_flags", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(xflags));

	key = X509_get0_pubkey_bitstr(cert);
	len = String_to_Hex(key->data, key->length, buffer, BUFSIZ);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("publicKey", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));

	/* Check if cert was issued by CA cert issuer or self signed */
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("self_signed", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewBooleanObj(X509_check_issued(cert, cert) == X509_V_OK));

	if (X509_digest(cert, EVP_get_digestbynid(mdnid), md, &n)) {
	    len = String_to_Hex(md, (int)n, buffer, BUFSIZ);
	} else {
	    len = 0;
	}
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("signatureHash", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));
    }

	/* Check if cert was issued by CA cert issuer or self signed */
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("selfIssued", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewBooleanObj(xflags & EXFLAG_SI));

	/* Check if cert was issued by CA cert issuer or self signed */
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("selfSigned", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewBooleanObj(xflags & EXFLAG_SS));


    /* Unique Ids -  The unique identifiers are present in the certificate to handle the
	possibility of reuse of subject and/or issuer names over time. RFC 5280 section 4.1.2.8 */
    {
	const ASN1_BIT_STRING *iuid, *suid;
        X509_get0_uids(cert, &iuid, &suid);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuerUniqueId", -1));
	if (iuid != NULL) {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj((char *)iuid->data, iuid->length));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}

	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectUniqueId", -1));
	if (suid != NULL) {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj((char *)suid->data, suid->length));
	} else {
	    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
	}
    }

    /* X509 v3 Extensions - RFC 5280 section 4.1.2.9 */
    num_of_exts = X509_get_ext_count(cert);
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("num_extensions", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(num_of_exts));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("extensions", -1));
    if (num_of_exts > 0) {
	Tcl_Obj *extsPtr = Tcl_NewListObj(0, NULL);
	const STACK_OF(X509_EXTENSION) *exts;
	exts = X509_get0_extensions(cert);

	for (int i=0; i < num_of_exts; i++) {
	    X509_EXTENSION *ex = sk_X509_EXTENSION_value(exts, i);
	    ASN1_OBJECT *obj = X509_EXTENSION_get_object(ex);
	    unsigned nid2 = OBJ_obj2nid(obj);
	    Tcl_ListObjAppendElement(interp, extsPtr, Tcl_NewStringObj(OBJ_nid2ln(nid2), -1));
	}
	Tcl_ListObjAppendElement(interp, certPtr, extsPtr);
    } else {
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
    }

    /* Authority Key Identifier (AKI) of a certificate should be the Subject Key
	Identifier (SKI) of its signer (the CA). RFC 5280 section 4.2.1.1 */
    {
	ASN1_OCTET_STRING *astring = X509_get0_authority_key_id(cert);
	if (astring != NULL) {
	    len = String_to_Hex((char *)ASN1_STRING_get0_data(astring), ASN1_STRING_length(astring), buffer, BUFSIZ);
	} else {
	    len = 0;
	}
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("authorityKeyIdentifier", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));
    }

    /* Subject Key Identifier (SKI) provides a means of identifying certificates
	that contain a particular public key. RFC 5280 section 4.2.1.2 */
    {
	ASN1_OCTET_STRING *astring = X509_get0_subject_key_id(cert);
	if (astring != NULL) {
	    len = String_to_Hex((char *)ASN1_STRING_get0_data(astring), ASN1_STRING_length(astring), buffer, BUFSIZ);
	} else {
	    len = 0;
	}
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectKeyIdentifier", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(buffer, len));
    }

    /* Key usage extension defines the purpose (e.g., encipherment, signature, certificate
	signing) of the key contained in the certificate. */
	signing) of the key contained in the certificate. RFC 5280 section 4.2.1.3 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("keyUsage", -1));
    usage = X509_get_key_usage(cert);
    if ((xflags & EXFLAG_KUSAGE) || usage < 0xffff) {
	Tcl_Obj *tmpPtr = Tcl_NewListObj(0, NULL);
	if (usage & KU_DIGITAL_SIGNATURE) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Digital Signature", -1));
	}
	if (usage & KU_NON_REPUDIATION) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Non-Repudiation", -1));
	}
	if (usage & KU_KEY_ENCIPHERMENT) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Key Encipherment", -1));
	}
	if (usage & KU_DATA_ENCIPHERMENT) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Data Encipherment", -1));
	}
	if (usage & KU_KEY_AGREEMENT) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Key Agreement", -1));
	}
	if (usage & KU_KEY_CERT_SIGN) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Certificate Signing", -1));
	}
	if (usage & KU_CRL_SIGN) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("CRL Signing", -1));
	}
	if (usage & KU_ENCIPHER_ONLY) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Encipher Only", -1));
	}
	if (usage & KU_DECIPHER_ONLY) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Decipher Only", -1));
	}
	Tcl_ListObjAppendElement(interp, certPtr, tmpPtr);
    } else {
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("", -1));
    }


    /* Purpose */
    {
	char *purpose = NULL;

	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("purpose", -1));
	if (X509_check_purpose(cert, X509_PURPOSE_SSL_CLIENT, 0) > 0) {
	    purpose = "SSL Client";
	} else if (X509_check_purpose(cert, X509_PURPOSE_SSL_SERVER, 0) > 0) {
	    purpose = "SSL Server";
	} else if (X509_check_purpose(cert, X509_PURPOSE_NS_SSL_SERVER, 0) > 0) {
	    purpose = "MSS SSL Server";
	} else if (X509_check_purpose(cert, X509_PURPOSE_SMIME_SIGN, 0) > 0) {
	    purpose = "SMIME Signing";
	} else if (X509_check_purpose(cert, X509_PURPOSE_SMIME_ENCRYPT, 0) > 0) {
	    purpose = "SMIME Encryption";
	} else if (X509_check_purpose(cert, X509_PURPOSE_CRL_SIGN, 0) > 0) {
	    purpose = "CRL Signing";
	} else if (X509_check_purpose(cert, X509_PURPOSE_ANY, 0) > 0) {
	    purpose = "Any";
	} else if (X509_check_purpose(cert, X509_PURPOSE_OCSP_HELPER, 0) > 0) {
	    purpose = "OCSP Helper";
	} else if (X509_check_purpose(cert, X509_PURPOSE_TIMESTAMP_SIGN, 0) > 0) {
	    purpose = "Timestamp Signing";
	} else {
	    purpose = "";
	}
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(purpose, -1));
    }

    {
	Tcl_Obj *purpPtr = Tcl_NewListObj(0, NULL);
	for (int j = 0; j < X509_PURPOSE_get_count(); j++) {
	    X509_PURPOSE *ptmp = X509_PURPOSE_get0(j);
	    Tcl_Obj *tmpPtr = Tcl_NewListObj(0, NULL);

	    for (int i = 0; i < 2; i++) {
		int idret = X509_check_purpose(cert, X509_PURPOSE_get_id(ptmp), i);
		Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj(i ? "CA" : "nonCA", -1));
		Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj(idret ? "Yes" : "No", -1));
		Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj(idret == 1 ? "Yes" : "No", -1));
	    }
	    Tcl_ListObjAppendElement(interp, purpPtr, Tcl_NewStringObj(X509_PURPOSE_get0_name(ptmp), -1));
	    Tcl_ListObjAppendElement(interp, purpPtr, tmpPtr);
	}
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("certificatePurpose", -1));
	Tcl_ListObjAppendElement(interp, certPtr, purpPtr);
    }

    /* Certificate Policies - indicates the issuing CA considers its issuerDomainPolicy
	equivalent to the subject CA's subjectDomainPolicy. */

    /* Subject Alternative Name (SAN) extension. Additional URLs, DNS name, or IP addresses
	bound to certificate. */
	equivalent to the subject CA's subjectDomainPolicy. RFC 5280 section 4.2.1.4 */
    if (xflags & EXFLAG_INVALID_POLICY) {
	/* Reject cert */
    }

    /* Policy Mappings - RFC 5280 section 4.2.1.5 */

    /* Subject Alternative Name (SAN) contains additional URLs, DNS name, or IP
	addresses bound to certificate. RFC 5280 section 4.2.1.6 */
    san = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
    if (san) {
	Tcl_Obj *namesPtr = Tcl_NewListObj(0, NULL);
	bio = BIO_new(BIO_s_mem());

	for (int i=0; i < sk_GENERAL_NAME_num(san); i++) {
	    const GENERAL_NAME *name = sk_GENERAL_NAME_value(san, i);
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	}
	BIO_free(bio);
	sk_GENERAL_NAME_pop_free(san, GENERAL_NAME_free);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectAltName", -1));
	Tcl_ListObjAppendElement(interp, certPtr, namesPtr);
    }

    /* Issuer Alternative Name */
    /* Issuer Alternative Name (issuerAltName) is used to associate Internet
	style identities with the certificate issuer. RFC 5280 section 4.2.1.7 */
    san = X509_get_ext_d2i(cert, NID_issuer_alt_name, NULL, NULL);
    if (san) {
	Tcl_Obj *namesPtr = Tcl_NewListObj(0, NULL);
	bio = BIO_new(BIO_s_mem());

	for (int i=0; i < sk_GENERAL_NAME_num(san); i++) {
	    const GENERAL_NAME *name = sk_GENERAL_NAME_value(san, i);
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	}
	BIO_free(bio);
	sk_GENERAL_NAME_pop_free(san, GENERAL_NAME_free);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuerAltName", -1));
	Tcl_ListObjAppendElement(interp, certPtr, namesPtr);
    }

    /* Subject Directory Attributes provides identification attributes (e.g., nationality)
	of the subject. RFC 5280 section 4.2.1.8 (subjectDirectoryAttributes) */
    /* Get the STACK of all crl distribution point entries for this certificate. */
    /* CRL_DIST_POINTS is typedef on STACK_OF(DIST_POINT). */

    /* Basic Constraints identifies whether the subject of the cert is a CA and
	the max depth of valid cert paths that include this cert.
	RFC 5280 section 4.2.1.9 (basicConstraints, NID_basic_constraints) */
    if (xflags & EXFLAG_BCONS || xflags & EXFLAG_CA) {
    }

    /* Name Constraints is only used in CA certs to indicate a name space within
	which all subject names in subsequent certificates in a certification path
	MUST be located. RFC 5280 section 4.2.1.10 */

    /* Policy Constraints is only used in CA certs to limit the length of a
	cert chain that may be issued from that CA. RFC 5280 section 4.2.1.11 */

    /* Extended Key Usage indicates one or more purposes for which the certified
	public key may be used, in addition to or in place of the basic purposes.
	RFC 5280 section 4.2.1.12 */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("extendedKeyUsage", -1));
    usage = X509_get_extended_key_usage(cert);
    if ((xflags & EXFLAG_XKUSAGE) || usage < 0xffff) {
	Tcl_Obj *tmpPtr = Tcl_NewListObj(0, NULL);
	if (usage & XKU_SSL_SERVER) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("TLS Web Server Authentication", -1));
	}
	if (usage & XKU_SSL_CLIENT) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("TLS Web Client Authentication", -1));
	}
	if (usage & XKU_SMIME) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("E-mail Protection", -1));
	}
	if (usage & XKU_CODE_SIGN) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Code Signing", -1));
	}
	if (usage & XKU_SGC) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("SGC", -1));
	}
	if (usage & XKU_OCSP_SIGN) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("OCSP Signing", -1));
	}
	if (usage & XKU_TIMESTAMP) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Time Stamping", -1));
	}
	if (usage & XKU_DVCS ) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("DVCS", -1));
	}
	if (usage & XKU_ANYEKU) {
	    Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj("Any Extended Key Usage", -1));
	}
	Tcl_ListObjAppendElement(interp, certPtr, tmpPtr);
    } else {
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj((int)X509_get_extended_key_usage(cert)));
    }

    /* CRL Distribution Points extension identifies how CRL information is
	obtained. RFC 5280 section 4.2.1.13*/
    crl = X509_get_ext_d2i(cert, NID_crl_distribution_points, NULL, NULL);
    if (crl) {
	Tcl_Obj *namesPtr = Tcl_NewListObj(0, NULL);

	for (int i=0; i < sk_DIST_POINT_num(crl); i++) {
	    DIST_POINT *dp = sk_DIST_POINT_value(crl, i);
	    DIST_POINT_NAME *distpoint = dp->distpoint;
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	    }
	}
	CRL_DIST_POINTS_free(crl);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("crlDistributionPoints", -1));
	Tcl_ListObjAppendElement(interp, certPtr, namesPtr);
    }

    /* Subject Directory Attributes */

    /* Freshest CRL extension */
    if (xflags & EXFLAG_FRESHEST) {
    }
    /* Basic Constraints - identifies whether the subject of the certificate is a CA and
	the maximum depth of valid certification paths that include this certificate. */

    /* Get OSCP URL */
    ocsp = X509_get1_ocsp(cert);
    if (ocsp) {
	Tcl_Obj *urlsPtr = Tcl_NewListObj(0, NULL);

	for (int i = 0; i < sk_OPENSSL_STRING_num(ocsp); i++) {
	    Tcl_ListObjAppendElement(interp, urlsPtr,
		Tcl_NewStringObj(sk_OPENSSL_STRING_value(ocsp, i), -1));
	}

	X509_email_free(ocsp);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("ocsp", -1));
	Tcl_ListObjAppendElement(interp, certPtr, urlsPtr);
    }

    /* Certificate Alias as UTF-8 string */
    {
	unsigned char *bstring;
	len = 0;
	bstring = X509_alias_get0(cert, &len);
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("alias", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj((char *)bstring, len));
    }

    return certPtr;
}

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