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x509builder.cpp
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x509builder.cpp
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#include "x509builder.h"
#include "extensions.h"
#include <string.h>
X509Builder::X509Builder()
: valid_seconds(20*365*24*60*60)
, crlDistPoints(NULL)
, subjectAltNames(NULL)
{
}
X509Builder::~X509Builder()
{
if (crlDistPoints)
sk_DIST_POINT_pop_free(crlDistPoints, DIST_POINT_free);
if (subjectAltNames)
sk_GENERAL_NAME_pop_free(subjectAltNames, GENERAL_NAME_free);
}
inline bool flagsSet(int val, int flags)
{
return (val & flags) == flags;
}
X509 *X509Builder::build(X509 *ca, EVP_PKEY *caKey, long serialNumber, CertUsage usage)
{
X509 *x = X509_new();
// If no CA is given create self-signed
if (!ca)
{
ca = x;
caKey = key;
}
// Set X509 Version
X509_set_version(x, 2);
// Set Serial Number
ASN1_INTEGER_set(X509_get_serialNumber(x), serialNumber);
// Set Certified Public Key
X509_set_pubkey(x, key);
// Create KeyID (sha1 hash of Public Key)
unsigned char keyHash[EVP_MAX_MD_SIZE];
unsigned int keyHashLen;
{
EVP_MD_CTX *ctx = EVP_MD_CTX_create();
EVP_DigestInit_ex(ctx, EVP_sha1(), NULL);
ASN1_BIT_STRING *key = x->cert_info->key->public_key;
EVP_DigestUpdate(ctx, key->data, key->length);
EVP_DigestFinal(ctx, keyHash, &keyHashLen);
EVP_MD_CTX_destroy(ctx);
}
// Set Validity Period
ASN1_TIME_set(X509_get_notBefore(x), time(NULL));
ASN1_TIME_set(X509_get_notAfter(x), time(NULL)+valid_seconds);
// Set Key Identifier
{
RefOctString id(true);
ASN1_OCTET_STRING_set(id, keyHash, keyHashLen);
RefExtension ext(X509V3_EXT_i2d(NID_subject_key_identifier, 0, id));
X509_add_ext(x, ext, -1);
}
// Set Authority Key Identifier
{
int abc = X509_get_ext_by_NID(ca, NID_subject_key_identifier, -1);
X509_EXTENSION *caExt = X509_get_ext(ca, abc);
RefAuthKeyId id(true);
id->keyid = (ASN1_OCTET_STRING *)X509V3_EXT_d2i(caExt);
RefExtension ext(X509V3_EXT_i2d(NID_authority_key_identifier, 0, id));
X509_add_ext(x, ext, -1);
}
// Set Subject Name
{
RefName name(true);
if (C.ptr)
X509_NAME_add_entry(name, C, -1, 0);
if (O.ptr)
X509_NAME_add_entry(name, O, -1, 0);
if (OU.ptr)
X509_NAME_add_entry(name, OU, -1, 0);
if (CN.ptr)
X509_NAME_add_entry(name, CN, -1, 0);
if (E.ptr)
X509_NAME_add_entry(name, E, -1, 0);
X509_set_subject_name(x, name);
}
// Set Issuer Name
X509_set_issuer_name(x, X509_get_subject_name(ca));
// Set Subject Alternative Name
if (subjectAltNames)
{
RefExtension ext(X509V3_EXT_i2d(NID_subject_alt_name, 0, subjectAltNames));
X509_add_ext(x, ext, -1);
}
// Set Basic Constraints
{
RefBasicConstraints bc(true);
if (flagsSet(usage, CRT_USAGE_CA))
bc->ca = 255;
else
bc->ca = 0;
RefExtension ext(X509V3_EXT_i2d(NID_basic_constraints, 0, bc));
X509_add_ext(x, ext, -1);
}
// Set Netscape Usage
{
RefBitString bs(true);
if (flagsSet(usage, CRT_USAGE_CA)) {
ASN1_BIT_STRING_set_bit(bs, NSCT_BIT_sslCA, 1);
ASN1_BIT_STRING_set_bit(bs, NSCT_BIT_emailCA, 1);
ASN1_BIT_STRING_set_bit(bs, NSCT_BIT_objCA, 1);
}
if (flagsSet(usage, CRT_USAGE_SERVER))
ASN1_BIT_STRING_set_bit(bs, NSCT_BIT_server, 1);
if (flagsSet(usage, CRT_USAGE_CLIENT))
ASN1_BIT_STRING_set_bit(bs, NSCT_BIT_client, 1);
RefExtension ext(X509V3_EXT_i2d(NID_netscape_cert_type, 0, bs));
X509_add_ext(x, ext, -1);
}
// Set Key Usage
{
RefBitString bs(true);
if (flagsSet(usage, CRT_USAGE_CA)) {
ASN1_BIT_STRING_set_bit(bs, KU_BIT_keyCertSign, 1);
ASN1_BIT_STRING_set_bit(bs, KU_BIT_cRLSign, 1);
}
if (flagsSet(usage, CRT_USAGE_SERVER)) {
ASN1_BIT_STRING_set_bit(bs, KU_BIT_digitalSignature, 1);
ASN1_BIT_STRING_set_bit(bs, KU_BIT_contentCommitment, 1);
ASN1_BIT_STRING_set_bit(bs, KU_BIT_keyEncipherment, 1);
ASN1_BIT_STRING_set_bit(bs, KU_BIT_dataEncipherment, 1);
ASN1_BIT_STRING_set_bit(bs, KU_BIT_keyAgreement, 1);
}
if (flagsSet(usage, CRT_USAGE_CLIENT))
ASN1_BIT_STRING_set_bit(bs, KU_BIT_digitalSignature, 1);
RefExtension ext(X509V3_EXT_i2d(NID_key_usage, 0, bs));
X509_add_ext(x, ext, -1);
}
// Set Extended Usage
if (flagsSet(usage, CRT_USAGE_SERVER) || flagsSet(usage, CRT_USAGE_CLIENT))
{
EXTENDED_KEY_USAGE *eku = EXTENDED_KEY_USAGE_new();
if (flagsSet(usage, CRT_USAGE_CLIENT))
sk_ASN1_OBJECT_push(eku, OBJ_txt2obj("1.3.6.1.5.5.7.3.2", 0)); // ClientAuthentication
if (flagsSet(usage, CRT_USAGE_SERVER))
sk_ASN1_OBJECT_push(eku, OBJ_txt2obj("1.3.6.1.5.5.7.3.1", 0)); // ServerAuthentication
if (flagsSet(usage, CRT_USAGE_IPSECServer))
sk_ASN1_OBJECT_push(eku, OBJ_txt2obj("1.3.6.1.5.5.8.2.2", 0)); // IPsecurityIKEintermediate
RefExtension ext(X509V3_EXT_i2d(NID_ext_key_usage, 0, eku));
X509_add_ext(x, ext, -1);
sk_ASN1_OBJECT_pop_free(eku, ASN1_OBJECT_free);
}
// Set CRL-Distribution Point
if (crlDistPoints)
{
RefExtension ext(X509V3_EXT_i2d(NID_crl_distribution_points, 0, crlDistPoints));
X509_add_ext(x, ext, -1);
}
// Set Authority Information Access
if (authInfoAccess.ptr)
{
RefExtension ext(X509V3_EXT_i2d(NID_info_access, 0, authInfoAccess.ptr));
X509_add_ext(x, ext, -1);
}
// Sign
X509_sign(x, caKey, EVP_sha1());
return x;
}
void X509Builder::setKey(EVP_PKEY *key)
{ this->key = key; }
void X509Builder::setCountry(const char *c)
{ C = X509_NAME_ENTRY_create_by_NID(NULL, NID_countryName, MBSTRING_UTF8, (unsigned char*)c, -1); }
void X509Builder::setOrganisation(const char *o)
{ O = X509_NAME_ENTRY_create_by_NID(NULL, NID_organizationName, MBSTRING_UTF8, (unsigned char*)o, -1); }
void X509Builder::setOrganisationUnit(const char *ou)
{ OU = X509_NAME_ENTRY_create_by_NID(NULL, NID_organizationalUnitName, MBSTRING_UTF8, (unsigned char*)ou, -1); }
void X509Builder::setCommonName(const char *cn)
{ CN = X509_NAME_ENTRY_create_by_NID(NULL, NID_commonName, MBSTRING_UTF8, (unsigned char*)cn, -1); }
void X509Builder::setEmailAddress(const char *e)
{ E = X509_NAME_ENTRY_create_by_NID(NULL, NID_pkcs9_emailAddress, MBSTRING_UTF8, (unsigned char*)e, -1); }
void X509Builder::addAltName(const char *name, NameType type)
{
if (!subjectAltNames)
subjectAltNames = GENERAL_NAMES_new();
GENERAL_NAME *gn = GENERAL_NAME_new();
if (type == NAME_TYPE_DNS) {
gn->d.ia5 = ASN1_IA5STRING_new();
ASN1_STRING_set(gn->d.ia5, (unsigned char*)name, strlen(name));
} else
return;
gn->type = type;
sk_GENERAL_NAME_push(subjectAltNames, gn);
}
void X509Builder::addCrlDistPoint(const char *url)
{
if (!crlDistPoints)
crlDistPoints = CRL_DIST_POINTS_new();
DIST_POINT *crlDistPoint = DIST_POINT_new();
crlDistPoint->distpoint = DIST_POINT_NAME_new();
crlDistPoint->distpoint->type = 0;
crlDistPoint->distpoint->name.fullname = GENERAL_NAMES_new();
GENERAL_NAME *name = GENERAL_NAME_new();
name->d.ia5 = ASN1_IA5STRING_new();
ASN1_STRING_set(name->d.ia5, (unsigned char*)url, strlen(url));
name->type = GEN_URI;
sk_GENERAL_NAME_push(crlDistPoint->distpoint->name.fullname, name);
sk_DIST_POINT_push(crlDistPoints, crlDistPoint);
}
void X509Builder::addAuthorityInfoAccessCrt(const char *url)
{
if (!authInfoAccess.ptr) authInfoAccess._new();
ACCESS_DESCRIPTION *ad = ACCESS_DESCRIPTION_new();
ad->method = OBJ_nid2obj(NID_ad_ca_issuers);
ad->location = GENERAL_NAME_new();
GENERAL_NAME *name = ad->location;
name->d.ia5 = ASN1_IA5STRING_new();
ASN1_STRING_set(name->d.ia5, (unsigned char*)url, strlen(url));
name->type = GEN_URI;
sk_ACCESS_DESCRIPTION_push(authInfoAccess.ptr, ad);
}
void X509Builder::addAuthorityInfoAccessOCSP(const char *url)
{
if (!authInfoAccess.ptr) authInfoAccess._new();
ACCESS_DESCRIPTION *ad = ACCESS_DESCRIPTION_new();
ad->method = OBJ_nid2obj(NID_ad_OCSP);
ad->location = GENERAL_NAME_new();
GENERAL_NAME *name = ad->location;
name->d.ia5 = ASN1_IA5STRING_new();
ASN1_STRING_set(name->d.ia5, (unsigned char*)url, strlen(url));
name->type = GEN_URI;
sk_ACCESS_DESCRIPTION_push(authInfoAccess.ptr, ad);
}
void X509Builder::setValidity(const long seconds)
{ valid_seconds = seconds; }
X509 *X509Builder::buildRootCA()
{
return build(NULL, NULL, 1, CRT_USAGE_CA);
}
X509 *X509Builder::buildIntermediateCA(X509 *ca, EVP_PKEY *caKey, long serialNumber)
{
return build(ca, caKey, serialNumber, CRT_USAGE_CA);
}
X509 *X509Builder::buildCert(X509 *ca, EVP_PKEY *caKey, long serialNumber, X509Builder::CertUsage usage)
{
return build(ca, caKey, serialNumber, usage);
}