/* * Copyright (C) 1997-2000 Sensus Consulting Ltd. * Matt Newman <[email protected]> * 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/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"; } /* *------------------------------------------------------* * * 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 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]; const char *shachars="0123456789ABCDEF"; int nid, pknid, bits, num_of_exts; uint32_t xflags; 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_get_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); } BIO_free(bio); } strcpy(notBefore, ASN1_UTCTIME_tostr(X509_getm_notBefore(cert))); strcpy(notAfter, ASN1_UTCTIME_tostr(X509_getm_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_algorithm", -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) { Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("digest", -1)); Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(OBJ_nid2ln(nid),-1)); Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("public_key_algorithm", -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)); if (pknid == NID_rsaEncryption || pknid == NID_dsa) { EVP_PKEY *pkey = X509_get_pubkey(cert); } /* 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)); } /* SHA1 - DER representation*/ X509_digest(cert, EVP_sha1(), sha1_hash_binary, NULL); for (int n = 0; n < SHA_DIGEST_LENGTH; n++) { sha1_hash_ascii[n*2] = shachars[(sha1_hash_binary[n] & 0xF0) >> 4]; sha1_hash_ascii[n*2+1] = shachars[(sha1_hash_binary[n] & 0x0F)]; } Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha1_hash", -1)); Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(sha1_hash_ascii, SHA_DIGEST_LENGTH * 2)); /* SHA256 - DER representation */ X509_digest(cert, EVP_sha256(), sha256_hash_binary, NULL); for (int n = 0; n < SHA256_DIGEST_LENGTH; n++) { sha256_hash_ascii[n*2] = shachars[(sha256_hash_binary[n] & 0xF0) >> 4]; sha256_hash_ascii[n*2+1] = shachars[(sha256_hash_binary[n] & 0x0F)]; } 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("serial", -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); } return certPtr; }
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