/* * Parse X.509 certificates and return contents as a TCL key-value list. * * 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/x509v3.h> #include <openssl/x509_vfy.h> #include <openssl/asn1.h> #include "tlsInt.h" /* Define maximum certificate size. Max PEM size 100kB and DER size is 24kB. */ #define CERT_STR_SIZE 24576 /* *----------------------------------------------------------------------------- * * String_to_Hex -- * * Format contents of a binary string as a hex string * * Results: * TCL byte array object with x509 identifier as a hex string * * Side Effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *String_to_Hex(unsigned char* input, int ilen) { unsigned char *iptr = input; Tcl_Obj *resultObj = Tcl_NewByteArrayObj(NULL, 0); unsigned char *data = Tcl_SetByteArrayLength(resultObj, (Tcl_Size)ilen*2); unsigned char *dptr = &data[0]; const char *hex = "0123456789abcdef"; if (resultObj == NULL) { return NULL; } for (int i = 0; i < ilen; i++) { *dptr++ = hex[(*iptr>>4)&0xF]; *dptr++ = hex[(*iptr++)&0xF]; } return resultObj; } /* *----------------------------------------------------------------------------- * * BIO_to_Buffer -- * * Output contents of a BIO to a buffer * * Results: * Returns length of string in buffer * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Size BIO_to_Buffer(int result, BIO *bio, void *output, int olen) { Tcl_Size len = 0; int pending = BIO_pending(bio); if (result) { len = (Tcl_Size) BIO_read(bio, output, (pending < olen) ? pending : olen); (void)BIO_flush(bio); if (len < 0) { len = 0; } } return len; } /* *----------------------------------------------------------------------------- * * Tls_x509Extensions -- * * Get list of X.509 Certificate Extensions * * Results: * TCL list of extensions and boolean critical status * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509Extensions(Tcl_Interp *interp, X509 *cert) { const STACK_OF(X509_EXTENSION) *exts; Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); if (resultObj == NULL) { return NULL; } if ((exts = X509_get0_extensions(cert)) != NULL) { for (int i=0; i < X509_get_ext_count(cert); i++) { X509_EXTENSION *ex = sk_X509_EXTENSION_value(exts, i); ASN1_OBJECT *obj = X509_EXTENSION_get_object(ex); /* ASN1_OCTET_STRING *data = X509_EXTENSION_get_data(ex); */ int critical = X509_EXTENSION_get_critical(ex); LAPPEND_BOOL(interp, resultObj, OBJ_nid2ln(OBJ_obj2nid(obj)), critical); } } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509Identifier -- * * Get X.509 certificate Authority or Subject Key Identifiers * * Results: * TCL byte array object with x509 identifier as a hex string * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509Identifier(const ASN1_OCTET_STRING *astring) { Tcl_Obj *resultObj = NULL; if (astring != NULL) { resultObj = String_to_Hex((unsigned char *)ASN1_STRING_get0_data(astring), ASN1_STRING_length(astring)); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509KeyUsage -- * * Get X.509 certificate key usage types * * Results: * Tcl list of types * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509KeyUsage(Tcl_Interp *interp, X509 *cert, uint32_t xflags) { uint32_t usage = X509_get_key_usage(cert); Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); if (resultObj == NULL) { return NULL; } if ((xflags & EXFLAG_KUSAGE) && usage < UINT32_MAX) { if (usage & KU_DIGITAL_SIGNATURE) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Digital Signature", -1)); } if (usage & KU_NON_REPUDIATION) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Non-Repudiation", -1)); } if (usage & KU_KEY_ENCIPHERMENT) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Key Encipherment", -1)); } if (usage & KU_DATA_ENCIPHERMENT) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Data Encipherment", -1)); } if (usage & KU_KEY_AGREEMENT) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Key Agreement", -1)); } if (usage & KU_KEY_CERT_SIGN) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Certificate Signing", -1)); } if (usage & KU_CRL_SIGN) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("CRL Signing", -1)); } if (usage & KU_ENCIPHER_ONLY) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Encipher Only", -1)); } if (usage & KU_DECIPHER_ONLY) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Decipher Only", -1)); } } else { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("unrestricted", -1)); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509Purpose -- * * Get X.509 certificate purpose * * Results: * Purpose string * * Side effects: * None * *----------------------------------------------------------------------------- */ char *Tls_x509Purpose(X509 *cert) { char *purpose = NULL; 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 = ""; } return purpose; } /* *----------------------------------------------------------------------------- * * Tls_x509Purposes -- * * Get X.509 certificate purpose types * * Results: * Tcl list of each purpose and whether it is CA or non-CA * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509Purposes(Tcl_Interp *interp, X509 *cert) { Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); X509_PURPOSE *ptmp; if (resultObj == NULL) { return NULL; } for (int i = 0; i < X509_PURPOSE_get_count(); i++) { ptmp = X509_PURPOSE_get0(i); Tcl_Obj *tmpPtr = Tcl_NewListObj(0, NULL); for (int j = 0; j < 2; j++) { int idret = X509_check_purpose(cert, X509_PURPOSE_get_id(ptmp), j); Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj(j ? "CA" : "nonCA", -1)); Tcl_ListObjAppendElement(interp, tmpPtr, Tcl_NewStringObj(idret == 1 ? "Yes" : "No", -1)); } LAPPEND_OBJ(interp, resultObj, X509_PURPOSE_get0_name(ptmp), tmpPtr); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509Names -- * * Get a list of Subject Alternate Names (SAN) or Issuer Alternate Names * * Results: * Tcl list of alternate names * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509Names(Tcl_Interp *interp, X509 *cert, int nid, BIO *bio) { STACK_OF(GENERAL_NAME) *names; Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); Tcl_Size len; char buffer[1024]; if (resultObj == NULL) { return NULL; } if ((names = X509_get_ext_d2i(cert, nid, NULL, NULL)) != NULL) { for (int i=0; i < sk_GENERAL_NAME_num(names); i++) { const GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i); len = BIO_to_Buffer(name && GENERAL_NAME_print(bio, (GENERAL_NAME *) name), bio, buffer, 1024); LAPPEND_STR(interp, resultObj, NULL, buffer, len); } sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509ExtKeyUsage -- * * Get a list of Extended Key Usages * * Returns: * Tcl list of usages * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509ExtKeyUsage(Tcl_Interp *interp, X509 *cert, uint32_t xflags) { uint32_t usage = X509_get_key_usage(cert); Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); if (resultObj == NULL) { return NULL; } if ((xflags & EXFLAG_XKUSAGE) && usage < UINT32_MAX) { usage = X509_get_extended_key_usage(cert); if (usage & XKU_SSL_SERVER) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("TLS Web Server Authentication", -1)); } if (usage & XKU_SSL_CLIENT) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("TLS Web Client Authentication", -1)); } if (usage & XKU_SMIME) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("E-mail Protection", -1)); } if (usage & XKU_CODE_SIGN) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Code Signing", -1)); } if (usage & XKU_SGC) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("SGC", -1)); } if (usage & XKU_OCSP_SIGN) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("OCSP Signing", -1)); } if (usage & XKU_TIMESTAMP) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Time Stamping", -1)); } if (usage & XKU_DVCS ) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("DVCS", -1)); } if (usage & XKU_ANYEKU) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("Any Extended Key Usage", -1)); } } else { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("unrestricted", -1)); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509CrlDp -- * * Get list of CRL Distribution Points * * Returns: * Tcl list of URIs and relative-names * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509CrlDp(Tcl_Interp *interp, X509 *cert) { STACK_OF(DIST_POINT) *crl; Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); if (resultObj == NULL) { return NULL; } if ((crl = X509_get_ext_d2i(cert, NID_crl_distribution_points, NULL, NULL)) != 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; if (distpoint->type == 0) { /* full-name GENERALIZEDNAME */ for (int j = 0; j < sk_GENERAL_NAME_num(distpoint->name.fullname); j++) { GENERAL_NAME *gen = sk_GENERAL_NAME_value(distpoint->name.fullname, j); int type; ASN1_STRING *uri = GENERAL_NAME_get0_value(gen, &type); if (type == GEN_URI) { LAPPEND_STR(interp, resultObj, (char *) NULL, (char *) ASN1_STRING_get0_data(uri), (Tcl_Size) ASN1_STRING_length(uri)); } } } else if (distpoint->type == 1) { /* relative-name X509NAME */ STACK_OF(X509_NAME_ENTRY) *sk_relname = distpoint->name.relativename; for (int j = 0; j < sk_X509_NAME_ENTRY_num(sk_relname); j++) { X509_NAME_ENTRY *e = sk_X509_NAME_ENTRY_value(sk_relname, j); ASN1_STRING *d = X509_NAME_ENTRY_get_data(e); LAPPEND_STR(interp, resultObj, (char *) NULL, (char *) ASN1_STRING_data(d), (Tcl_Size) ASN1_STRING_length(d)); } } } CRL_DIST_POINTS_free(crl); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509Oscp * * Get list of On-line Certificate Status Protocol (OSCP) URIs * * Results: * Tcl list of URIs * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509Oscp(Tcl_Interp *interp, X509 *cert) { STACK_OF(OPENSSL_STRING) *ocsp; Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); if (resultObj == NULL) { return NULL; } if ((ocsp = X509_get1_ocsp(cert)) != NULL) { for (int i = 0; i < sk_OPENSSL_STRING_num(ocsp); i++) { LAPPEND_STR(interp, resultObj, NULL, sk_OPENSSL_STRING_value(ocsp, i), -1); } X509_email_free(ocsp); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_x509CaIssuers -- * * Get list of Certificate Authority (CA) Issuer URIs * * Results: * Tcl list of CA issuer URIs * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_x509CaIssuers(Tcl_Interp *interp, X509 *cert) { STACK_OF(ACCESS_DESCRIPTION) *ads; ACCESS_DESCRIPTION *ad; Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); unsigned char *buf; if (resultObj == NULL) { return NULL; } if ((ads = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL)) != NULL) { for (int i = 0; i < sk_ACCESS_DESCRIPTION_num(ads); i++) { ad = sk_ACCESS_DESCRIPTION_value(ads, i); if (OBJ_obj2nid(ad->method) == NID_ad_ca_issuers && ad->location) { if (ad->location->type == GEN_URI) { Tcl_Size len = (Tcl_Size) ASN1_STRING_to_UTF8(&buf, ad->location->d.uniformResourceIdentifier); Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj((char *) buf, len)); OPENSSL_free(buf); break; } } } /* sk_ACCESS_DESCRIPTION_pop_free(ads, ACCESS_DESCRIPTION_free); */ AUTHORITY_INFO_ACCESS_free(ads); } return resultObj; } /* *----------------------------------------------------------------------------- * * Tls_NewX509Obj -- * * Parses a X509 certificate and returns contents as a key-value Tcl list. * * Result: * A Tcl List with the X509 certificate info as a key-value list * * Side effects: * None * *----------------------------------------------------------------------------- */ Tcl_Obj *Tls_NewX509Obj(Tcl_Interp *interp, X509 *cert, int all) { Tcl_Obj *resultObj = Tcl_NewListObj(0, NULL); BIO *bio = BIO_new(BIO_s_mem()); int mdnid, pknid, bits; Tcl_Size len; unsigned int ulen; uint32_t xflags; unsigned long flags = XN_FLAG_RFC2253 | ASN1_STRFLGS_UTF8_CONVERT; flags &= ~ASN1_STRFLGS_ESC_MSB; char *buffer = ckalloc(BUFSIZ > EVP_MAX_MD_SIZE ? BUFSIZ : EVP_MAX_MD_SIZE); dprintf("Called"); if (interp == NULL || cert == NULL || bio == NULL || resultObj == NULL || buffer == NULL) { Tcl_DecrRefCount(resultObj); BIO_free(bio); if (buffer != NULL) ckfree(buffer); return NULL; } /* Signature algorithm and value - RFC 5280 section 4.1.1.2 and 4.1.1.3 */ /* signatureAlgorithm is the id of the cryptographic algorithm used by the CA to sign this cert. signatureValue is the digital signature computed upon the ASN.1 DER encoded tbsCertificate. */ { const X509_ALGOR *sig_alg; const ASN1_BIT_STRING *sig; int sig_nid; X509_get0_signature(&sig, &sig_alg, cert); /* sig_nid = X509_get_signature_nid(cert) */ sig_nid = OBJ_obj2nid(sig_alg->algorithm); LAPPEND_STR(interp, resultObj, "signatureAlgorithm", OBJ_nid2ln(sig_nid), -1); if (sig_nid != NID_undef) { LAPPEND_OBJ(interp, resultObj, "signatureValue", String_to_Hex(sig->data, sig->length)); } else { LAPPEND_STR(interp, resultObj, "signatureValue", "", 0); } } /* Version of the encoded certificate - RFC 5280 section 4.1.2.1 */ LAPPEND_LONG(interp, resultObj, "version", X509_get_version(cert)+1); /* Unique number assigned by CA to certificate - RFC 5280 section 4.1.2.2 */ len = BIO_to_Buffer(i2a_ASN1_INTEGER(bio, X509_get0_serialNumber(cert)), bio, buffer, BUFSIZ); LAPPEND_STR(interp, resultObj, "serialNumber", buffer, len); /* Signature algorithm used by the CA to sign the certificate. Must match signatureAlgorithm. RFC 5280 section 4.1.2.3 */ LAPPEND_STR(interp, resultObj, "signature", OBJ_nid2ln(X509_get_signature_nid(cert)), -1); /* Issuer identifies the entity that signed and issued the cert. RFC 5280 section 4.1.2.4 */ len = BIO_to_Buffer(X509_NAME_print_ex(bio, X509_get_issuer_name(cert), 0, flags), bio, buffer, BUFSIZ); LAPPEND_STR(interp, resultObj, "issuer", buffer, len); /* Certificate validity period is the interval the CA warrants that it will maintain info on the status of the certificate. RFC 5280 section 4.1.2.5 */ /* Get Validity - Not Before */ len = BIO_to_Buffer(ASN1_TIME_print(bio, X509_get0_notBefore(cert)), bio, buffer, BUFSIZ); LAPPEND_STR(interp, resultObj, "notBefore", buffer, len); /* Get Validity - Not After */ len = BIO_to_Buffer(ASN1_TIME_print(bio, X509_get0_notAfter(cert)), bio, buffer, BUFSIZ); LAPPEND_STR(interp, resultObj, "notAfter", buffer, len); /* Subject identifies the entity associated with the public key stored in the subject public key field. RFC 5280 section 4.1.2.6 */ len = BIO_to_Buffer(X509_NAME_print_ex(bio, X509_get_subject_name(cert), 0, flags), bio, buffer, BUFSIZ); LAPPEND_STR(interp, resultObj, "subject", buffer, len); /* SHA1 Digest (Fingerprint) of cert - DER representation */ if (X509_digest(cert, EVP_sha1(), (unsigned char *)buffer, &ulen)) { LAPPEND_OBJ(interp, resultObj, "sha1_hash", String_to_Hex((unsigned char *)buffer, (int) ulen)); } /* SHA256 Digest (Fingerprint) of cert - DER representation */ if (X509_digest(cert, EVP_sha256(), (unsigned char *)buffer, &ulen)) { LAPPEND_OBJ(interp, resultObj, "sha256_hash", String_to_Hex((unsigned char *)buffer, (int) ulen)); } /* 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)) { ASN1_BIT_STRING *key; unsigned int n; LAPPEND_STR(interp, resultObj, "signingDigest", OBJ_nid2ln(mdnid), -1); LAPPEND_STR(interp, resultObj, "publicKeyAlgorithm", OBJ_nid2ln(pknid), -1); LAPPEND_INT(interp, resultObj, "bits", bits); /* Effective security bits */ key = X509_get0_pubkey_bitstr(cert); LAPPEND_OBJ(interp, resultObj, "publicKey", String_to_Hex(key->data, key->length)); if (X509_pubkey_digest(cert, EVP_get_digestbynid(pknid), (unsigned char *)buffer, &n)) { LAPPEND_OBJ(interp, resultObj, "publicKeyHash", String_to_Hex((unsigned char *)buffer, (int) n)); } else { LAPPEND_STR(interp, resultObj, "publicKeyHash", "", 0); } /* digest of the DER representation of the certificate */ if (X509_digest(cert, EVP_get_digestbynid(mdnid), (unsigned char *)buffer, &n)) { LAPPEND_OBJ(interp, resultObj, "signatureHash", String_to_Hex((unsigned char *)buffer, (int) n)); } else { LAPPEND_STR(interp, resultObj, "signatureHash", "", 0); } } /* Certificate Purpose. Call before checking for extensions. */ LAPPEND_STR(interp, resultObj, "purpose", Tls_x509Purpose(cert), -1); LAPPEND_OBJ(interp, resultObj, "certificatePurpose", Tls_x509Purposes(interp, cert)); /* Get extensions flags */ xflags = X509_get_extension_flags(cert); LAPPEND_INT(interp, resultObj, "extFlags", xflags); /* Check if cert was issued by CA cert issuer or self signed */ LAPPEND_BOOL(interp, resultObj, "selfIssued", xflags & EXFLAG_SI); LAPPEND_BOOL(interp, resultObj, "selfSigned", xflags & EXFLAG_SS); LAPPEND_BOOL(interp, resultObj, "isProxyCert", xflags & EXFLAG_PROXY); LAPPEND_BOOL(interp, resultObj, "extInvalid", xflags & EXFLAG_INVALID); LAPPEND_BOOL(interp, resultObj, "isCACert", X509_check_ca(cert)); /* The Unique Ids are used 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, resultObj, Tcl_NewStringObj("issuerUniqueId", -1)); if (iuid != NULL) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewByteArrayObj((const unsigned char *)iuid->data, (Tcl_Size) iuid->length)); } else { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("", -1)); } Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("subjectUniqueId", -1)); if (suid != NULL) { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewByteArrayObj((const unsigned char *)suid->data, (Tcl_Size) suid->length)); } else { Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("", -1)); } } /* X509 v3 Extensions - RFC 5280 section 4.1.2.9 */ LAPPEND_INT(interp, resultObj, "extCount", X509_get_ext_count(cert)); LAPPEND_OBJ(interp, resultObj, "extensions", Tls_x509Extensions(interp, cert)); /* Authority Key Identifier (AKI) is the Subject Key Identifier (SKI) of its signer (the CA). RFC 5280 section 4.2.1.1, NID_authority_key_identifier */ LAPPEND_OBJ(interp, resultObj, "authorityKeyIdentifier", Tls_x509Identifier(X509_get0_authority_key_id(cert))); /* Subject Key Identifier (SKI) is used to identify certificates that contain a particular public key. RFC 5280 section 4.2.1.2, NID_subject_key_identifier */ LAPPEND_OBJ(interp, resultObj, "subjectKeyIdentifier", Tls_x509Identifier(X509_get0_subject_key_id(cert))); /* Key usage extension defines the purpose (e.g., encipherment, signature, certificate signing) of the key in the certificate. RFC 5280 section 4.2.1.3, NID_key_usage */ LAPPEND_OBJ(interp, resultObj, "keyUsage", Tls_x509KeyUsage(interp, cert, xflags)); /* Certificate Policies - indicates the issuing CA considers its issuerDomainPolicy equivalent to the subject CA's subjectDomainPolicy. RFC 5280 section 4.2.1.4, NID_certificate_policies */ if (xflags & EXFLAG_INVALID_POLICY) { /* Reject cert */ } /* Policy Mappings - RFC 5280 section 4.2.1.5, NID_policy_mappings */ /* Subject Alternative Name (SAN) contains additional URLs, DNS names, or IP addresses bound to certificate. RFC 5280 section 4.2.1.6, NID_subject_alt_name */ LAPPEND_OBJ(interp, resultObj, "subjectAltName", Tls_x509Names(interp, cert, NID_subject_alt_name, bio)); /* Issuer Alternative Name is used to associate Internet style identities with the certificate issuer. RFC 5280 section 4.2.1.7, NID_issuer_alt_name */ LAPPEND_OBJ(interp, resultObj, "issuerAltName", Tls_x509Names(interp, cert, NID_issuer_alt_name, bio)); /* Subject Directory Attributes provides identification attributes (e.g., nationality) of the subject. RFC 5280 section 4.2.1.8 (subjectDirectoryAttributes) */ /* Basic Constraints identifies whether the subject of the cert is a CA and the max depth of valid cert paths for this cert. RFC 5280 section 4.2.1.9, NID_basic_constraints */ if (!(xflags & EXFLAG_PROXY)) { LAPPEND_LONG(interp, resultObj, "pathLen", X509_get_pathlen(cert)); } else { LAPPEND_LONG(interp, resultObj, "pathLen", X509_get_proxy_pathlen(cert)); } LAPPEND_BOOL(interp, resultObj, "basicConstraintsCA", xflags & EXFLAG_CA); /* Name Constraints is only used in CA certs to indicate the name space for all subject names in subsequent certificates in a certification path MUST be located. RFC 5280 section 4.2.1.10, NID_name_constraints */ /* Policy Constraints is only used in CA certs to limit the length of a cert chain for that CA. RFC 5280 section 4.2.1.11, NID_policy_constraints */ /* Extended Key Usage indicates the purposes the certified public key may be used, beyond the basic purposes. RFC 5280 section 4.2.1.12, NID_ext_key_usage */ LAPPEND_OBJ(interp, resultObj, "extendedKeyUsage", Tls_x509ExtKeyUsage(interp, cert, xflags)); /* CRL Distribution Points identifies where CRL information can be obtained. RFC 5280 section 4.2.1.13*/ LAPPEND_OBJ(interp, resultObj, "crlDistributionPoints", Tls_x509CrlDp(interp, cert)); /* Freshest CRL extension */ if (xflags & EXFLAG_FRESHEST) { } /* Authority Information Access indicates how to access info and services for the certificate issuer. RFC 5280 section 4.2.2.1, NID_info_access */ /* On-line Certificate Status Protocol (OSCP) Responders URL */ LAPPEND_OBJ(interp, resultObj, "ocspResponders", Tls_x509Oscp(interp, cert)); /* Certificate Authority (CA) Issuers URL */ LAPPEND_OBJ(interp, resultObj, "caIssuers", Tls_x509CaIssuers(interp, cert)); /* Subject Information Access - RFC 5280 section 4.2.2.2, NID_sinfo_access */ /* Certificate Alias. If uses a PKCS#12 structure, alias will reflect the friendlyName attribute (RFC 2985). */ { int ilen = 0; unsigned char *string = X509_alias_get0(cert, &ilen); LAPPEND_STR(interp, resultObj, "alias", (char *) string, (Tcl_Size) ilen); string = X509_keyid_get0(cert, &ilen); LAPPEND_STR(interp, resultObj, "keyId", (char *) string, (Tcl_Size) ilen); } /* Certificate and dump all data */ if (all) { Tcl_Obj *allObj = Tcl_NewByteArrayObj(NULL, 0); Tcl_Obj *certObj = Tcl_NewByteArrayObj(NULL, 0); unsigned char *allStr, *certStr; if (allObj == NULL || certObj == NULL) { Tcl_DecrRefCount(allObj); BIO_free(bio); ckfree(buffer); return resultObj; } /* Get certificate */ certStr = Tcl_SetByteArrayLength(certObj, CERT_STR_SIZE); len = BIO_to_Buffer(PEM_write_bio_X509(bio, cert), bio, certStr, CERT_STR_SIZE); Tcl_SetByteArrayLength(certObj, len); LAPPEND_OBJ(interp, resultObj, "certificate", certObj) /* Get all info on certificate */ allStr = Tcl_SetByteArrayLength(allObj, CERT_STR_SIZE * 2); len = BIO_to_Buffer(X509_print_ex(bio, cert, flags, 0), bio, allStr, CERT_STR_SIZE * 2); Tcl_SetByteArrayLength(allObj, len); LAPPEND_OBJ(interp, resultObj, "all", allObj) } BIO_free(bio); ckfree(buffer); return resultObj; }
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