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strongswan/src/libstrongswan/crypto/ocsp.c

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/**
* @file ocsp.c
*
* @brief Implementation of ocsp_t.
*
*/
/* Support of the Online Certificate Status Protocol (OCSP)
* Copyright (C) 2003 Christoph Gysin, Simon Zwahlen
* Zuercher Hochschule Winterthur
*
* 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 <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <asn1/oid.h>
#include <asn1/asn1.h>
#include <utils/identification.h>
#include <utils/randomizer.h>
#include <utils/fetcher.h>
#include <debug.h>
#include "hashers/hasher.h"
#include "certinfo.h"
#include "x509.h"
#include "ocsp.h"
#define NONCE_LENGTH 16
typedef struct private_ocsp_t private_ocsp_t;
/**
* Private data of a ocsp_t object.
*/
struct private_ocsp_t {
/**
* Public interface for this ocsp object.
*/
ocsp_t public;
/**
* CA certificate.
*/
x509_t *cacert;
/**
* Requestor certificate
*/
x509_t *requestor_cert;
/**
* Linked list of ocsp uris
*/
linked_list_t *uris;
/**
* Linked list of certinfos to be requested
*/
linked_list_t *certinfos;
/**
* Nonce required for ocsp request and response
*/
chunk_t nonce;
/**
* SHA-1 hash over issuer distinguished name
*/
chunk_t authNameID;
};
static const char *const response_status_names[] = {
"successful",
"malformed request",
"internal error",
"try later",
"signature required",
"unauthorized"
};
/* response container */
typedef struct response_t response_t;
struct response_t {
chunk_t tbs;
chunk_t responder_id_name;
chunk_t responder_id_key;
time_t produced_at;
chunk_t responses;
chunk_t nonce;
int algorithm;
chunk_t signature;
};
const response_t empty_response = {
{ NULL, 0 } , /* tbs */
{ NULL, 0 } , /* responder_id_name */
{ NULL, 0 } , /* responder_id_key */
UNDEFINED_TIME, /* produced_at */
{ NULL, 0 } , /* single_response */
{ NULL, 0 } , /* nonce */
OID_UNKNOWN , /* signature_algorithm */
{ NULL, 0 } /* signature */
};
/* single response container */
typedef struct single_response single_response_t;
struct single_response {
single_response_t *next;
int hash_algorithm;
chunk_t issuer_name_hash;
chunk_t issuer_key_hash;
chunk_t serialNumber;
cert_status_t status;
time_t revocationTime;
crl_reason_t revocationReason;
time_t thisUpdate;
time_t nextUpdate;
};
const single_response_t empty_single_response = {
NULL , /* *next */
OID_UNKNOWN , /* hash_algorithm */
{ NULL, 0 } , /* issuer_name_hash */
{ NULL, 0 } , /* issuer_key_hash */
{ NULL, 0 } , /* serial_number */
CERT_UNDEFINED , /* status */
UNDEFINED_TIME , /* revocationTime */
REASON_UNSPECIFIED, /* revocationReason */
UNDEFINED_TIME , /* this_update */
UNDEFINED_TIME /* next_update */
};
/* some OCSP specific prefabricated ASN.1 constants */
static u_char ASN1_nonce_oid_str[] = {
0x06, 0x09,
0x2B, 0x06,
0x01, 0x05, 0x05, 0x07, 0x30, 0x01, 0x02
};
static u_char ASN1_response_oid_str[] = {
0x06, 0x09,
0x2B, 0x06,
0x01, 0x05, 0x05, 0x07, 0x30, 0x01, 0x04
};
static u_char ASN1_response_content_str[] = {
0x04, 0x0D,
0x30, 0x0B,
0x06, 0x09,
0x2B, 0x06,
0x01, 0x05, 0x05, 0x07, 0x30, 0x01, 0x01
};
static const chunk_t ASN1_nonce_oid = chunk_from_buf(ASN1_nonce_oid_str);
static const chunk_t ASN1_response_oid = chunk_from_buf(ASN1_response_oid_str);
static const chunk_t ASN1_response_content = chunk_from_buf(ASN1_response_content_str);
/* asn.1 definitions for parsing */
static const asn1Object_t ocspResponseObjects[] = {
{ 0, "OCSPResponse", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "responseStatus", ASN1_ENUMERATED, ASN1_BODY }, /* 1 */
{ 1, "responseBytesContext", ASN1_CONTEXT_C_0, ASN1_OPT }, /* 2 */
{ 2, "responseBytes", ASN1_SEQUENCE, ASN1_NONE }, /* 3 */
{ 3, "responseType", ASN1_OID, ASN1_BODY }, /* 4 */
{ 3, "response", ASN1_OCTET_STRING, ASN1_BODY }, /* 5 */
{ 1, "end opt", ASN1_EOC, ASN1_END } /* 6 */
};
#define OCSP_RESPONSE_STATUS 1
#define OCSP_RESPONSE_TYPE 4
#define OCSP_RESPONSE 5
#define OCSP_RESPONSE_ROOF 7
static const asn1Object_t basicResponseObjects[] = {
{ 0, "BasicOCSPResponse", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "tbsResponseData", ASN1_SEQUENCE, ASN1_OBJ }, /* 1 */
{ 2, "versionContext", ASN1_CONTEXT_C_0, ASN1_NONE |
ASN1_DEF }, /* 2 */
{ 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 3 */
{ 2, "responderIdContext", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 4 */
{ 3, "responderIdByName", ASN1_SEQUENCE, ASN1_OBJ }, /* 5 */
{ 2, "end choice", ASN1_EOC, ASN1_END }, /* 6 */
{ 2, "responderIdContext", ASN1_CONTEXT_C_2, ASN1_OPT }, /* 7 */
{ 3, "responderIdByKey", ASN1_OCTET_STRING, ASN1_BODY }, /* 8 */
{ 2, "end choice", ASN1_EOC, ASN1_END }, /* 9 */
{ 2, "producedAt", ASN1_GENERALIZEDTIME, ASN1_BODY }, /* 10 */
{ 2, "responses", ASN1_SEQUENCE, ASN1_OBJ }, /* 11 */
{ 2, "responseExtensionsContext", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 12 */
{ 3, "responseExtensions", ASN1_SEQUENCE, ASN1_LOOP }, /* 13 */
{ 4, "extension", ASN1_SEQUENCE, ASN1_NONE }, /* 14 */
{ 5, "extnID", ASN1_OID, ASN1_BODY }, /* 15 */
{ 5, "critical", ASN1_BOOLEAN, ASN1_BODY |
ASN1_DEF }, /* 16 */
{ 5, "extnValue", ASN1_OCTET_STRING, ASN1_BODY }, /* 17 */
{ 4, "end loop", ASN1_EOC, ASN1_END }, /* 18 */
{ 2, "end opt", ASN1_EOC, ASN1_END }, /* 19 */
{ 1, "signatureAlgorithm", ASN1_EOC, ASN1_RAW }, /* 20 */
{ 1, "signature", ASN1_BIT_STRING, ASN1_BODY }, /* 21 */
{ 1, "certsContext", ASN1_CONTEXT_C_0, ASN1_OPT }, /* 22 */
{ 2, "certs", ASN1_SEQUENCE, ASN1_LOOP }, /* 23 */
{ 3, "certificate", ASN1_SEQUENCE, ASN1_OBJ }, /* 24 */
{ 2, "end loop", ASN1_EOC, ASN1_END }, /* 25 */
{ 1, "end opt", ASN1_EOC, ASN1_END } /* 26 */
};
#define BASIC_RESPONSE_TBS_DATA 1
#define BASIC_RESPONSE_VERSION 3
#define BASIC_RESPONSE_ID_BY_NAME 5
#define BASIC_RESPONSE_ID_BY_KEY 8
#define BASIC_RESPONSE_PRODUCED_AT 10
#define BASIC_RESPONSE_RESPONSES 11
#define BASIC_RESPONSE_EXT_ID 15
#define BASIC_RESPONSE_CRITICAL 16
#define BASIC_RESPONSE_EXT_VALUE 17
#define BASIC_RESPONSE_ALGORITHM 20
#define BASIC_RESPONSE_SIGNATURE 21
#define BASIC_RESPONSE_CERTIFICATE 24
#define BASIC_RESPONSE_ROOF 27
static const asn1Object_t responsesObjects[] = {
{ 0, "responses", ASN1_SEQUENCE, ASN1_LOOP }, /* 0 */
{ 1, "singleResponse", ASN1_EOC, ASN1_RAW }, /* 1 */
{ 0, "end loop", ASN1_EOC, ASN1_END } /* 2 */
};
#define RESPONSES_SINGLE_RESPONSE 1
#define RESPONSES_ROOF 3
static const asn1Object_t singleResponseObjects[] = {
{ 0, "singleResponse", ASN1_SEQUENCE, ASN1_BODY }, /* 0 */
{ 1, "certID", ASN1_SEQUENCE, ASN1_NONE }, /* 1 */
{ 2, "algorithm", ASN1_EOC, ASN1_RAW }, /* 2 */
{ 2, "issuerNameHash", ASN1_OCTET_STRING, ASN1_BODY }, /* 3 */
{ 2, "issuerKeyHash", ASN1_OCTET_STRING, ASN1_BODY }, /* 4 */
{ 2, "serialNumber", ASN1_INTEGER, ASN1_BODY }, /* 5 */
{ 1, "certStatusGood", ASN1_CONTEXT_S_0, ASN1_OPT }, /* 6 */
{ 1, "end opt", ASN1_EOC, ASN1_END }, /* 7 */
{ 1, "certStatusRevoked", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 8 */
{ 2, "revocationTime", ASN1_GENERALIZEDTIME, ASN1_BODY }, /* 9 */
{ 2, "revocationReason", ASN1_CONTEXT_C_0, ASN1_OPT }, /* 10 */
{ 3, "crlReason", ASN1_ENUMERATED, ASN1_BODY }, /* 11 */
{ 2, "end opt", ASN1_EOC, ASN1_END }, /* 12 */
{ 1, "end opt", ASN1_EOC, ASN1_END }, /* 13 */
{ 1, "certStatusUnknown", ASN1_CONTEXT_S_2, ASN1_OPT }, /* 14 */
{ 1, "end opt", ASN1_EOC, ASN1_END }, /* 15 */
{ 1, "thisUpdate", ASN1_GENERALIZEDTIME, ASN1_BODY }, /* 16 */
{ 1, "nextUpdateContext", ASN1_CONTEXT_C_0, ASN1_OPT }, /* 17 */
{ 2, "nextUpdate", ASN1_GENERALIZEDTIME, ASN1_BODY }, /* 18 */
{ 1, "end opt", ASN1_EOC, ASN1_END }, /* 19 */
{ 1, "singleExtensionsContext", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 20 */
{ 2, "singleExtensions", ASN1_SEQUENCE, ASN1_LOOP }, /* 21 */
{ 3, "extension", ASN1_SEQUENCE, ASN1_NONE }, /* 22 */
{ 4, "extnID", ASN1_OID, ASN1_BODY }, /* 23 */
{ 4, "critical", ASN1_BOOLEAN, ASN1_BODY |
ASN1_DEF }, /* 24 */
{ 4, "extnValue", ASN1_OCTET_STRING, ASN1_BODY }, /* 25 */
{ 2, "end loop", ASN1_EOC, ASN1_END }, /* 26 */
{ 1, "end opt", ASN1_EOC, ASN1_END } /* 27 */
};
#define SINGLE_RESPONSE_ALGORITHM 2
#define SINGLE_RESPONSE_ISSUER_NAME_HASH 3
#define SINGLE_RESPONSE_ISSUER_KEY_HASH 4
#define SINGLE_RESPONSE_SERIAL_NUMBER 5
#define SINGLE_RESPONSE_CERT_STATUS_GOOD 6
#define SINGLE_RESPONSE_CERT_STATUS_REVOKED 8
#define SINGLE_RESPONSE_CERT_STATUS_REVOCATION_TIME 9
#define SINGLE_RESPONSE_CERT_STATUS_CRL_REASON 11
#define SINGLE_RESPONSE_CERT_STATUS_UNKNOWN 14
#define SINGLE_RESPONSE_THIS_UPDATE 16
#define SINGLE_RESPONSE_NEXT_UPDATE 18
#define SINGLE_RESPONSE_EXT_ID 23
#define SINGLE_RESPONSE_CRITICAL 24
#define SINGLE_RESPONSE_EXT_VALUE 25
#define SINGLE_RESPONSE_ROOF 28
/**
* build requestorName (into TBSRequest)
*/
static chunk_t build_requestor_name(private_ocsp_t *this)
{
identification_t *requestor_name = this->requestor_cert->get_subject(this->requestor_cert);
return asn1_wrap(ASN1_CONTEXT_C_1, "m",
asn1_simple_object(ASN1_CONTEXT_C_4,
requestor_name->get_encoding(requestor_name)));
}
/**
* build request (into requestList)
* no singleRequestExtensions used
*/
static chunk_t build_request(private_ocsp_t *this, certinfo_t *certinfo)
{
chunk_t authKeyID = this->cacert->get_subjectKeyID(this->cacert);
chunk_t serialNumber = certinfo->get_serialNumber(certinfo);
chunk_t reqCert = asn1_wrap(ASN1_SEQUENCE, "cmmm",
ASN1_sha1_id,
asn1_simple_object(ASN1_OCTET_STRING, this->authNameID),
asn1_simple_object(ASN1_OCTET_STRING, authKeyID),
asn1_simple_object(ASN1_INTEGER, serialNumber));
return asn1_wrap(ASN1_SEQUENCE, "m", reqCert);
}
/**
* build requestList (into TBSRequest)
*/
static chunk_t build_request_list(private_ocsp_t *this)
{
chunk_t requestList;
size_t datalen = 0;
linked_list_t *request_list = linked_list_create();
{
iterator_t *iterator = this->certinfos->create_iterator(this->certinfos, TRUE);
certinfo_t *certinfo;
while (iterator->iterate(iterator, (void**)&certinfo))
{
chunk_t *request = malloc_thing(chunk_t);
*request = build_request(this, certinfo);
request_list->insert_last(request_list, (void*)request);
datalen += request->len;
}
iterator->destroy(iterator);
}
{
iterator_t *iterator = request_list->create_iterator(request_list, TRUE);
chunk_t *request;
u_char *pos = build_asn1_object(&requestList, ASN1_SEQUENCE, datalen);
while (iterator->iterate(iterator, (void**)&request))
{
memcpy(pos, request->ptr, request->len);
pos += request->len;
free(request->ptr);
free(request);
}
iterator->destroy(iterator);
request_list->destroy(request_list);
}
return requestList;
}
/**
* build nonce extension (into requestExtensions)
*/
static chunk_t build_nonce_extension(private_ocsp_t *this)
{
randomizer_t *randomizer = randomizer_create();
/* generate a random nonce */
randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_LENGTH, &this->nonce);
randomizer->destroy(randomizer);
return asn1_wrap(ASN1_SEQUENCE, "cm",
ASN1_nonce_oid,
asn1_simple_object(ASN1_OCTET_STRING, this->nonce));
}
/**
* build requestExtensions (into TBSRequest)
*/
static chunk_t build_request_ext(private_ocsp_t *this)
{
return asn1_wrap(ASN1_CONTEXT_C_2, "m",
asn1_wrap(ASN1_SEQUENCE, "mm",
build_nonce_extension(this),
asn1_wrap(ASN1_SEQUENCE, "cc",
ASN1_response_oid,
ASN1_response_content
)
)
);
}
/**
* build TBSRequest (into OCSPRequest)
*/
static chunk_t build_tbs_request(private_ocsp_t *this, bool has_requestor_cert)
{
/* version is skipped since the default is ok */
return asn1_wrap(ASN1_SEQUENCE, "mmm",
(has_requestor_cert)? build_requestor_name(this): chunk_empty,
build_request_list(this),
build_request_ext(this));
}
/**
* build signature into ocsp request
* gets built only if a request cert with a corresponding private key is found
*/
static chunk_t build_signature(private_ocsp_t *this, chunk_t tbsRequest)
{
return chunk_empty;
}
/**
* assembles an ocsp request and sets the nonce field in private_ocsp_t to the sent nonce
*/
static chunk_t ocsp_build_request(private_ocsp_t *this)
{
bool has_requestor_cert;
chunk_t keyid = this->cacert->get_keyid(this->cacert);
chunk_t tbsRequest, signature;
DBG2("assembling ocsp request");
DBG2("issuer: '%D'", this->cacert->get_subject(this->cacert));
DBG2("keyid: %#B", &keyid);
/* looks for requestor cert and matching private key */
has_requestor_cert = FALSE;
/* has_requestor_cert = get_ocsp_requestor_cert(location); */
/* build content */
tbsRequest = build_tbs_request(this, has_requestor_cert);
/* sign tbsReuqest */
signature = (has_requestor_cert)? build_signature(this, tbsRequest): chunk_empty;
return asn1_wrap(ASN1_SEQUENCE, "mm",
tbsRequest,
signature);
return signature;
}
/**
* Implements ocsp_t.fetch.
*/
static void fetch(private_ocsp_t *this, certinfo_t *certinfo)
{
chunk_t request;
chunk_t reply;
bool fetched = FALSE;
if (this->uris->get_count(this->uris) == 0)
{
return;
}
this->certinfos->insert_last(this->certinfos, (void*)certinfo);
request = ocsp_build_request(this);
DBG3("ocsp request: %B", &request);
{
iterator_t *iterator = this->uris->create_iterator(this->uris, TRUE);
identification_t *uri;
while (iterator->iterate(iterator, (void**)&uri))
{
fetcher_t *fetcher;
char uri_string[BUF_LEN];
chunk_t uri_chunk = uri->get_encoding(uri);
snprintf(uri_string, BUF_LEN, "%.*s", uri_chunk.len, uri_chunk.ptr);
fetcher = fetcher_create(uri_string);
reply = fetcher->post(fetcher, "application/ocsp-request", request);
fetcher->destroy(fetcher);
if (reply.ptr != NULL)
{
fetched = TRUE;
break;
}
}
iterator->destroy(iterator);
}
free(request.ptr);
if (!fetched)
{
return;
}
DBG3("ocsp reply: %B", &reply);
}
/**
* Implements ocsp_t.destroy.
*/
static void destroy(private_ocsp_t *this)
{
this->certinfos->destroy(this->certinfos);
free(this->authNameID.ptr);
free(this->nonce.ptr);
free(this);
}
/*
* Described in header.
*/
ocsp_t *ocsp_create(x509_t *cacert, linked_list_t *uris)
{
private_ocsp_t *this = malloc_thing(private_ocsp_t);
/* initialize */
this->cacert = cacert;
this->uris = uris;
this->certinfos = linked_list_create();
this->nonce = chunk_empty;
{
hasher_t *hasher = hasher_create(HASH_SHA1);
identification_t *issuer = cacert->get_subject(cacert);
hasher->allocate_hash(hasher, issuer->get_encoding(issuer),
&this->authNameID);
hasher->destroy(hasher);
}
/* public functions */
this->public.fetch = (void (*) (ocsp_t*,certinfo_t*))fetch;
this->public.destroy = (void (*) (ocsp_t*))destroy;
return &this->public;
}
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