/*
* Copyright (C) 1997-2000 Sensus Consulting Ltd.
* Matt Newman <matt@sensus.org>
* Copyright (C) 2023 Brian O'Hagan
*/
#include <tcl.h>
#include <stdio.h>
#include <openssl/bio.h>
#include <openssl/sha.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/asn1.h>
#include "tlsInt.h"
/*
* Ensure these are not macros - known to be defined on Win32
*/
#ifdef min
#undef min
#endif
#ifdef max
#undef max
#endif
static int min(int a, int b)
{
return (a < b) ? a : b;
}
static int max(int a, int b)
{
return (a > b) ? a : b;
}
/*
* ASN1_UTCTIME_tostr --
*/
static char *
ASN1_UTCTIME_tostr(ASN1_UTCTIME *tm)
{
static char bp[128];
char *v;
int gmt=0;
static char *mon[12]={
"Jan","Feb","Mar","Apr","May","Jun", "Jul","Aug","Sep","Oct","Nov","Dec"};
int i;
int y=0,M=0,d=0,h=0,m=0,s=0;
i=tm->length;
v=(char *)tm->data;
if (i < 10) goto err;
if (v[i-1] == 'Z') gmt=1;
for (i=0; i<10; i++)
if ((v[i] > '9') || (v[i] < '0')) goto err;
y= (v[0]-'0')*10+(v[1]-'0');
if (y < 70) y+=100;
M= (v[2]-'0')*10+(v[3]-'0');
if ((M > 12) || (M < 1)) goto err;
d= (v[4]-'0')*10+(v[5]-'0');
h= (v[6]-'0')*10+(v[7]-'0');
m= (v[8]-'0')*10+(v[9]-'0');
if ((v[10] >= '0') && (v[10] <= '9') && (v[11] >= '0') && (v[11] <= '9'))
s= (v[10]-'0')*10+(v[11]-'0');
sprintf(bp,"%s %2d %02d:%02d:%02d %d%s", mon[M-1],d,h,m,s,y+1900,(gmt)?" GMT":"");
return bp;
err:
return "Bad time value";
}
/*
* Binary string to hex string
*/
int String_to_Hex(char* input, int len, char *output, int max) {
int count = 0;
for (int i = 0; i < len && count < max - 1; i++, count += 2) {
sprintf(output + count, "%02X", input[i] & 0xff);
}
output[count] = 0;
return count;
}
/*
*------------------------------------------------------*
*
* Tls_NewX509Obj --
*
* ------------------------------------------------*
* Converts a X509 certificate into a Tcl_Obj
* ------------------------------------------------*
*
* Sideeffects:
* None
*
* Result:
* A Tcl List Object representing the provided
* X509 certificate.
*
*------------------------------------------------------*
*/
#define CERT_STR_SIZE 16384
Tcl_Obj*
Tls_NewX509Obj(Tcl_Interp *interp, X509 *cert) {
Tcl_Obj *certPtr = Tcl_NewListObj(0, NULL);
BIO *bio;
int n;
unsigned long flags;
char subject[BUFSIZ];
char issuer[BUFSIZ];
char serial[BUFSIZ];
char notBefore[BUFSIZ];
char notAfter[BUFSIZ];
char publicKey[BUFSIZ];
char certStr[CERT_STR_SIZE], *certStr_p;
int certStr_len, toRead;
char sha1_hash_ascii[SHA_DIGEST_LENGTH * 2 + 1];
unsigned char sha1_hash_binary[SHA_DIGEST_LENGTH];
char sha256_hash_ascii[SHA256_DIGEST_LENGTH * 2 + 1];
unsigned char sha256_hash_binary[SHA256_DIGEST_LENGTH];
int nid, pknid, bits, num_of_exts, len;
uint32_t xflags;
unsigned char *bstring;
STACK_OF(GENERAL_NAME) *san;
sha1_hash_ascii[SHA_DIGEST_LENGTH * 2] = '\0';
sha256_hash_ascii[SHA256_DIGEST_LENGTH * 2] = '\0';
certStr[0] = 0;
if ((bio = BIO_new(BIO_s_mem())) == NULL) {
subject[0] = 0;
issuer[0] = 0;
serial[0] = 0;
} else {
flags = XN_FLAG_RFC2253 | ASN1_STRFLGS_UTF8_CONVERT;
flags &= ~ASN1_STRFLGS_ESC_MSB;
X509_NAME_print_ex(bio, X509_get_subject_name(cert), 0, flags);
n = BIO_read(bio, subject, min(BIO_pending(bio), BUFSIZ - 1));
n = max(n, 0);
subject[n] = 0;
(void)BIO_flush(bio);
X509_NAME_print_ex(bio, X509_get_issuer_name(cert), 0, flags);
n = BIO_read(bio, issuer, min(BIO_pending(bio), BUFSIZ - 1));
n = max(n, 0);
issuer[n] = 0;
(void)BIO_flush(bio);
i2a_ASN1_INTEGER(bio, X509_get0_serialNumber(cert));
n = BIO_read(bio, serial, min(BIO_pending(bio), BUFSIZ - 1));
n = max(n, 0);
serial[n] = 0;
(void)BIO_flush(bio);
/* Get certificate */
if (PEM_write_bio_X509(bio, cert)) {
certStr_p = certStr;
certStr_len = 0;
while (1) {
toRead = min(BIO_pending(bio), CERT_STR_SIZE - certStr_len - 1);
toRead = min(toRead, BUFSIZ);
if (toRead == 0) {
break;
}
dprintf("Reading %i bytes from the certificate...", toRead);
n = BIO_read(bio, certStr_p, toRead);
if (n <= 0) {
break;
}
certStr_len += n;
certStr_p += n;
}
*certStr_p = '\0';
(void)BIO_flush(bio);
}
/* All */
if (X509_print_ex(bio, cert, flags, 0)) {
char all[65536];
n = BIO_read(bio, all, min(BIO_pending(bio), 65535));
n = max(n, 0);
all[n] = 0;
(void)BIO_flush(bio);
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("all", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(all, n));
}
BIO_free(bio);
}
strcpy(notBefore, ASN1_UTCTIME_tostr(X509_get0_notBefore(cert)));
strcpy(notAfter, ASN1_UTCTIME_tostr(X509_get0_notAfter(cert)));
/* Version */
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("version", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewLongObj(X509_get_version(cert)+1));
/* Signature algorithm */
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("signature", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(X509_get_signature_nid(cert)),-1));
/* Information about the signature of certificate cert */
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, publicKey, BUFSIZ);
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("publicKey", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(publicKey, 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));
}
/* Alias */
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("alias", -1));
len = 0;
bstring = X509_alias_get0(cert, &len);
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj(bstring, len));
/* Subject Key Identifier is a hash of the encoded public key. Required for
CA certs. CAs use SKI for Issuer Key Identifier (AKI) extension on issued certificates. */
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectKeyIdentifier", -1));
len = 0;
bstring = X509_keyid_get0(cert, &len);
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewByteArrayObj(bstring, len));
/* SHA1 Fingerprint of cert - DER representation */
X509_digest(cert, EVP_sha1(), sha1_hash_binary, &len);
len = String_to_Hex(sha1_hash_binary, len, sha1_hash_ascii, BUFSIZ);
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha1_hash", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(sha1_hash_ascii, len));
/* SHA256 Fingerprint of cert - DER representation */
X509_digest(cert, EVP_sha256(), sha256_hash_binary, &len);
len = String_to_Hex(sha256_hash_binary, len, sha256_hash_ascii, BUFSIZ);
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha256_hash", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( sha256_hash_ascii, SHA256_DIGEST_LENGTH * 2));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subject", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( subject, -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuer", -1));
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( issuer, -1));
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));
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));
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 extensions */
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);
}
/* Subject Alternative Name (SAN) extension. Additional host names for a single SSL certificate. */
san = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
if (san) {
Tcl_Obj *namesPtr = Tcl_NewListObj(0, NULL);
for (int i=0; i < sk_GENERAL_NAME_num(san); i++) {
const GENERAL_NAME *name = sk_GENERAL_NAME_value(san, i);
size_t len2;
if (name) {
if (name->type == GEN_DNS) {
char *dns_name;
if ((len2 = ASN1_STRING_to_UTF8(&dns_name, name->d.dNSName)) > 0) {
Tcl_ListObjAppendElement(interp, namesPtr, Tcl_NewStringObj(dns_name, (int)len2));
OPENSSL_free (dns_name);
}
} else if (name->type == GEN_IPADD) {
/* name->d.iPAddress */
}
}
}
sk_GENERAL_NAME_pop_free(san, GENERAL_NAME_free);
Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subjectAltName", -1));
Tcl_ListObjAppendElement(interp, certPtr, namesPtr);
}
return certPtr;
}