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strongswan/src/libstrongswan/plugins/x509/x509_pkcs10.c

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/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Copyright (C) 2009 Andreas Steffen
*
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "x509_pkcs10.h"
#include <library.h>
#include <debug.h>
#include <asn1/oid.h>
#include <asn1/asn1.h>
#include <asn1/asn1_parser.h>
#include <credentials/keys/private_key.h>
#include <utils/linked_list.h>
#include <utils/identification.h>
typedef struct private_x509_pkcs10_t private_x509_pkcs10_t;
/**
* Private data of a x509_pkcs10_t object.
*/
struct private_x509_pkcs10_t {
/**
* Public interface for this certificate.
*/
x509_pkcs10_t public;
/**
* PKCS#10 certificate request encoding in ASN.1 DER format
*/
chunk_t encoding;
/**
* PKCS#10 request body over which signature is computed
*/
chunk_t certificationRequestInfo;
/**
* Version of the PKCS#10 certificate request
*/
u_int version;
/**
* ID representing the certificate subject
*/
identification_t *subject;
/**
* List of subjectAltNames as identification_t
*/
linked_list_t *subjectAltNames;
/**
* certificate's embedded public key
*/
public_key_t *public_key;
/**
* challenge password
*/
chunk_t challengePassword;
/**
* Signature algorithm
*/
int algorithm;
/**
* Signature
*/
chunk_t signature;
/**
* Is the certificate request self-signed?
*/
bool self_signed;
/**
* Certificate request parsed from blob/file?
*/
bool parsed;
/**
* reference count
*/
refcount_t ref;
};
/**
* Imported from x509_cert.c
*/
extern void x509_parse_generalNames(chunk_t blob, int level0, bool implicit, linked_list_t *list);
extern chunk_t x509_build_subjectAltNames(linked_list_t *list);
/**
* Implementation of certificate_t.get_type.
*/
static certificate_type_t get_type(private_x509_pkcs10_t *this)
{
return CERT_PKCS10_REQUEST;
}
/**
* Implementation of certificate_t.get_subject and get_issuer.
*/
static identification_t* get_subject(private_x509_pkcs10_t *this)
{
return this->subject;
}
/**
* Implementation of certificate_t.has_subject and has_issuer.
*/
static id_match_t has_subject(private_x509_pkcs10_t *this, identification_t *subject)
{
return this->subject->matches(this->subject, subject);
}
/**
* Implementation of certificate_t.issued_by.
*/
static bool issued_by(private_x509_pkcs10_t *this, certificate_t *issuer)
{
public_key_t *key;
signature_scheme_t scheme;
if (&this->public.interface.interface != issuer)
{
return FALSE;
}
if (this->self_signed)
{
return TRUE;
}
/* determine signature scheme */
scheme = signature_scheme_from_oid(this->algorithm);
if (scheme == SIGN_UNKNOWN)
{
return FALSE;
}
/* get the public key contained in the certificate request */
key = this->public_key;
if (!key)
{
return FALSE;
}
return key->verify(key, scheme, this->certificationRequestInfo,
this->signature);
}
/**
* Implementation of certificate_t.get_public_key.
*/
static public_key_t* get_public_key(private_x509_pkcs10_t *this)
{
this->public_key->get_ref(this->public_key);
return this->public_key;
}
/**
* Implementation of certificate_t.get_validity.
*/
static bool get_validity(private_x509_pkcs10_t *this, time_t *when,
time_t *not_before, time_t *not_after)
{
if (not_before)
{
*not_before = 0;
}
if (not_after)
{
*not_after = ~0;
}
return TRUE;
}
/**
* Implementation of certificate_t.is_newer.
*/
static bool is_newer(certificate_t *this, certificate_t *that)
{
return FALSE;
}
/**
* Implementation of certificate_t.get_encoding.
*/
static chunk_t get_encoding(private_x509_pkcs10_t *this)
{
return chunk_clone(this->encoding);
}
/**
* Implementation of certificate_t.equals.
*/
static bool equals(private_x509_pkcs10_t *this, certificate_t *other)
{
chunk_t encoding;
bool equal;
if (this == (private_x509_pkcs10_t*)other)
{
return TRUE;
}
if (other->get_type(other) != CERT_PKCS10_REQUEST)
{
return FALSE;
}
if (other->equals == (void*)equals)
{ /* skip allocation if we have the same implementation */
return chunk_equals(this->encoding, ((private_x509_pkcs10_t*)other)->encoding);
}
encoding = other->get_encoding(other);
equal = chunk_equals(this->encoding, encoding);
free(encoding.ptr);
return equal;
}
/**
* Implementation of certificate_t.get_ref
*/
static private_x509_pkcs10_t* get_ref(private_x509_pkcs10_t *this)
{
ref_get(&this->ref);
return this;
}
/**
* Implementation of certificate_t.get_challengePassword.
*/
static chunk_t get_challengePassword(private_x509_pkcs10_t *this)
{
return this->challengePassword;
}
/**
* Implementation of pkcs10_t.create_subjectAltName_enumerator.
*/
static enumerator_t* create_subjectAltName_enumerator(private_x509_pkcs10_t *this)
{
return this->subjectAltNames->create_enumerator(this->subjectAltNames);
}
/**
* ASN.1 definition of a PKCS#10 extension request
*/
static const asn1Object_t extensionRequestObjects[] = {
{ 0, "extensions", ASN1_SEQUENCE, ASN1_LOOP }, /* 0 */
{ 1, "extension", ASN1_SEQUENCE, ASN1_NONE }, /* 1 */
{ 2, "extnID", ASN1_OID, ASN1_BODY }, /* 2 */
{ 2, "critical", ASN1_BOOLEAN, ASN1_DEF|ASN1_BODY }, /* 3 */
{ 2, "extnValue", ASN1_OCTET_STRING, ASN1_BODY }, /* 4 */
{ 1, "end loop", ASN1_EOC, ASN1_END }, /* 5 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PKCS10_EXTN_ID 2
#define PKCS10_EXTN_CRITICAL 3
#define PKCS10_EXTN_VALUE 4
/**
* Parses a PKCS#10 extension request
*/
static bool parse_extension_request(private_x509_pkcs10_t *this, chunk_t blob, int level0)
{
asn1_parser_t *parser;
chunk_t object;
int objectID;
int extn_oid = OID_UNKNOWN;
bool success = FALSE;
bool critical;
parser = asn1_parser_create(extensionRequestObjects, blob);
parser->set_top_level(parser, level0);
while (parser->iterate(parser, &objectID, &object))
{
u_int level = parser->get_level(parser)+1;
switch (objectID)
{
case PKCS10_EXTN_ID:
extn_oid = asn1_known_oid(object);
break;
case PKCS10_EXTN_CRITICAL:
critical = object.len && *object.ptr;
DBG2(DBG_LIB, " %s", critical ? "TRUE" : "FALSE");
break;
case PKCS10_EXTN_VALUE:
{
switch (extn_oid)
{
case OID_SUBJECT_ALT_NAME:
x509_parse_generalNames(object, level, FALSE,
this->subjectAltNames);
break;
default:
break;
}
break;
}
default:
break;
}
}
success = parser->success(parser);
parser->destroy(parser);
return success;
}
/**
* Parses a PKCS#10 challenge password
*/
static bool parse_challengePassword(private_x509_pkcs10_t *this, chunk_t blob, int level)
{
char tag;
if (blob.len < 2)
{
DBG1(DBG_LIB, "L%d - challengePassword: ASN.1 object smaller "
"than 2 octets", level);
return FALSE;
}
tag = *blob.ptr;
if (tag < ASN1_UTF8STRING || tag > ASN1_IA5STRING)
{
DBG1(DBG_LIB, "L%d - challengePassword: ASN.1 object is not "
"a character string", level);
return FALSE;
}
if (asn1_length(&blob) == ASN1_INVALID_LENGTH)
{
DBG1(DBG_LIB, "L%d - challengePassword: ASN.1 object has an "
"invalid length", level);
return FALSE;
}
DBG2(DBG_LIB, "L%d - challengePassword:", level);
DBG4(DBG_LIB, " '%.*s'", blob.len, blob.ptr);
return TRUE;
}
/**
* ASN.1 definition of a PKCS#10 certificate request
*/
static const asn1Object_t certificationRequestObjects[] = {
{ 0, "certificationRequest", ASN1_SEQUENCE, ASN1_OBJ }, /* 0 */
{ 1, "certificationRequestInfo", ASN1_SEQUENCE, ASN1_OBJ }, /* 1 */
{ 2, "version", ASN1_INTEGER, ASN1_BODY }, /* 2 */
{ 2, "subject", ASN1_SEQUENCE, ASN1_OBJ }, /* 3 */
{ 2, "subjectPublicKeyInfo", ASN1_SEQUENCE, ASN1_RAW }, /* 4 */
{ 2, "attributes", ASN1_CONTEXT_C_0, ASN1_LOOP }, /* 5 */
{ 3, "attribute", ASN1_SEQUENCE, ASN1_NONE }, /* 6 */
{ 4, "type", ASN1_OID, ASN1_BODY }, /* 7 */
{ 4, "values", ASN1_SET, ASN1_LOOP }, /* 8 */
{ 5, "value", ASN1_EOC, ASN1_RAW }, /* 9 */
{ 4, "end loop", ASN1_EOC, ASN1_END }, /* 10 */
{ 2, "end loop", ASN1_EOC, ASN1_END }, /* 11 */
{ 1, "signatureAlgorithm", ASN1_EOC, ASN1_RAW }, /* 12 */
{ 1, "signature", ASN1_BIT_STRING, ASN1_BODY }, /* 13 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PKCS10_CERT_REQUEST_INFO 1
#define PKCS10_VERSION 2
#define PKCS10_SUBJECT 3
#define PKCS10_SUBJECT_PUBLIC_KEY_INFO 4
#define PKCS10_ATTR_TYPE 7
#define PKCS10_ATTR_VALUE 9
#define PKCS10_ALGORITHM 12
#define PKCS10_SIGNATURE 13
/**
* Parses a PKCS#10 certificate request
*/
static bool parse_certificate_request(private_x509_pkcs10_t *this)
{
asn1_parser_t *parser;
chunk_t object;
int objectID;
int attr_oid = OID_UNKNOWN;
bool success = FALSE;
parser = asn1_parser_create(certificationRequestObjects, this->encoding);
while (parser->iterate(parser, &objectID, &object))
{
u_int level = parser->get_level(parser)+1;
switch (objectID)
{
case PKCS10_CERT_REQUEST_INFO:
this->certificationRequestInfo = object;
break;
case PKCS10_VERSION:
if (object.len > 0 && *object.ptr != 0)
{
DBG1(DBG_LIB, "PKCS#10 certificate request format is "
"not version 1");
goto end;
}
break;
case PKCS10_SUBJECT:
this->subject = identification_create_from_encoding(ID_DER_ASN1_DN, object);
DBG2(DBG_LIB, " '%Y'", this->subject);
break;
case PKCS10_SUBJECT_PUBLIC_KEY_INFO:
this->public_key = lib->creds->create(lib->creds, CRED_PUBLIC_KEY,
KEY_ANY, BUILD_BLOB_ASN1_DER, object, BUILD_END);
if (this->public_key == NULL)
{
goto end;
}
break;
case PKCS10_ATTR_TYPE:
attr_oid = asn1_known_oid(object);
break;
case PKCS10_ATTR_VALUE:
switch (attr_oid)
{
case OID_EXTENSION_REQUEST:
if (!parse_extension_request(this, object, level))
{
goto end;
}
break;
case OID_CHALLENGE_PASSWORD:
if (!parse_challengePassword(this, object, level))
{
goto end;
}
break;
default:
break;
}
break;
case PKCS10_ALGORITHM:
this->algorithm = asn1_parse_algorithmIdentifier(object, level, NULL);
break;
case PKCS10_SIGNATURE:
this->signature = object;
break;
default:
break;
}
}
success = parser->success(parser);
end:
parser->destroy(parser);
if (success)
{
/* check if the certificate request is self-signed */
if (issued_by(this, &this->public.interface.interface))
{
this->self_signed = TRUE;
}
else
{
DBG1(DBG_LIB, "certificate request is not self-signed");
success = FALSE;
}
}
return success;
}
/**
* Implementation of certificate_t.destroy
*/
static void destroy(private_x509_pkcs10_t *this)
{
if (ref_put(&this->ref))
{
this->subjectAltNames->destroy_offset(this->subjectAltNames,
offsetof(identification_t, destroy));
DESTROY_IF(this->subject);
DESTROY_IF(this->public_key);
chunk_free(&this->encoding);
if (!this->parsed)
{ /* only parsed certificate requests point these fields to "encoded" */
chunk_free(&this->certificationRequestInfo);
chunk_free(&this->challengePassword);
chunk_free(&this->signature);
}
free(this);
}
}
/**
* create an empty but initialized PKCS#10 certificate request
*/
static private_x509_pkcs10_t* create_empty(void)
{
private_x509_pkcs10_t *this = malloc_thing(private_x509_pkcs10_t);
this->public.interface.interface.get_type = (certificate_type_t (*) (certificate_t*))get_type;
this->public.interface.interface.get_subject = (identification_t* (*) (certificate_t*))get_subject;
this->public.interface.interface.get_issuer = (identification_t* (*) (certificate_t*))get_subject;
this->public.interface.interface.has_subject = (id_match_t (*) (certificate_t*, identification_t*))has_subject;
this->public.interface.interface.has_issuer = (id_match_t (*) (certificate_t*, identification_t*))has_subject;
this->public.interface.interface.issued_by = (bool (*) (certificate_t*, certificate_t*))issued_by;
this->public.interface.interface.get_public_key = (public_key_t* (*) (certificate_t*))get_public_key;
this->public.interface.interface.get_validity = (bool (*) (certificate_t*, time_t*, time_t*, time_t*))get_validity;
this->public.interface.interface.is_newer = (bool (*) (certificate_t*,certificate_t*))is_newer;
this->public.interface.interface.get_encoding = (chunk_t (*) (certificate_t*))get_encoding;
this->public.interface.interface.equals = (bool (*)(certificate_t*, certificate_t*))equals;
this->public.interface.interface.get_ref = (certificate_t* (*)(certificate_t*))get_ref;
this->public.interface.interface.destroy = (void (*)(certificate_t*))destroy;
this->public.interface.get_challengePassword = (chunk_t (*)(pkcs10_t*))get_challengePassword;
this->public.interface.create_subjectAltName_enumerator = (enumerator_t* (*)(pkcs10_t*))create_subjectAltName_enumerator;
this->encoding = chunk_empty;
this->certificationRequestInfo = chunk_empty;
this->subject = NULL;
this->public_key = NULL;
this->subjectAltNames = linked_list_create();
this->challengePassword = chunk_empty;
this->signature = chunk_empty;
this->ref = 1;
this->self_signed = FALSE;
this->parsed = FALSE;
return this;
}
/**
* Generate and sign a new certificate request
*/
static bool generate(private_x509_pkcs10_t *cert, private_key_t *sign_key,
int digest_alg)
{
chunk_t key_info, subjectAltNames, attributes;
chunk_t extensionRequest = chunk_empty;
chunk_t challengePassword = chunk_empty;
signature_scheme_t scheme;
identification_t *subject;
subject = cert->subject;
cert->public_key = sign_key->get_public_key(sign_key);
/* select signature scheme */
cert->algorithm = hasher_signature_algorithm_to_oid(digest_alg,
sign_key->get_type(sign_key));
if (cert->algorithm == OID_UNKNOWN)
{
return FALSE;
}
scheme = signature_scheme_from_oid(cert->algorithm);
if (!cert->public_key->get_encoding(cert->public_key,
KEY_PUB_SPKI_ASN1_DER, &key_info))
{
return FALSE;
}
/* encode subjectAltNames */
subjectAltNames = x509_build_subjectAltNames(cert->subjectAltNames);
if (subjectAltNames.ptr)
{
extensionRequest = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_build_known_oid(OID_EXTENSION_REQUEST),
asn1_wrap(ASN1_SET, "m",
asn1_wrap(ASN1_SEQUENCE, "m", subjectAltNames)
));
}
if (cert->challengePassword.len > 0)
{
asn1_t type = asn1_is_printablestring(cert->challengePassword) ?
ASN1_PRINTABLESTRING : ASN1_T61STRING;
challengePassword = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_build_known_oid(OID_CHALLENGE_PASSWORD),
asn1_wrap(ASN1_SET, "m",
asn1_simple_object(type, cert->challengePassword)
)
);
}
attributes = asn1_wrap(ASN1_CONTEXT_C_0, "mm", extensionRequest,
challengePassword);
cert->certificationRequestInfo = asn1_wrap(ASN1_SEQUENCE, "ccmm",
ASN1_INTEGER_0,
subject->get_encoding(subject),
key_info,
attributes);
if (!sign_key->sign(sign_key, scheme, cert->certificationRequestInfo,
&cert->signature))
{
return FALSE;
}
cert->encoding = asn1_wrap(ASN1_SEQUENCE, "cmm",
cert->certificationRequestInfo,
asn1_algorithmIdentifier(cert->algorithm),
asn1_bitstring("c", cert->signature));
return TRUE;
}
/**
* See header.
*/
x509_pkcs10_t *x509_pkcs10_load(certificate_type_t type, va_list args)
{
chunk_t blob = chunk_empty;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_BLOB_ASN1_DER:
blob = va_arg(args, chunk_t);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
if (blob.ptr)
{
private_x509_pkcs10_t *cert = create_empty();
cert->encoding = chunk_clone(blob);
cert->parsed = TRUE;
if (parse_certificate_request(cert))
{
return &cert->public;
}
destroy(cert);
}
return NULL;
}
/**
* See header.
*/
x509_pkcs10_t *x509_pkcs10_gen(certificate_type_t type, va_list args)
{
private_x509_pkcs10_t *cert;
private_key_t *sign_key = NULL;
hash_algorithm_t digest_alg = HASH_SHA1;
cert = create_empty();
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_SIGNING_KEY:
sign_key = va_arg(args, private_key_t*);
continue;
case BUILD_SUBJECT:
cert->subject = va_arg(args, identification_t*);
cert->subject = cert->subject->clone(cert->subject);
continue;
case BUILD_SUBJECT_ALTNAMES:
{
enumerator_t *enumerator;
identification_t *id;
linked_list_t *list;
list = va_arg(args, linked_list_t*);
enumerator = list->create_enumerator(list);
while (enumerator->enumerate(enumerator, &id))
{
cert->subjectAltNames->insert_last(cert->subjectAltNames,
id->clone(id));
}
enumerator->destroy(enumerator);
continue;
}
case BUILD_PASSPHRASE:
cert->challengePassword = chunk_clone(va_arg(args, chunk_t));
continue;
case BUILD_DIGEST_ALG:
digest_alg = va_arg(args, int);
continue;
case BUILD_END:
break;
default:
destroy(cert);
return NULL;
}
break;
}
if (sign_key && generate(cert, sign_key, digest_alg))
{
return &cert->public;
}
destroy(cert);
return NULL;
}
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