/* ocsp_cl.c */ /* Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL * project. */ /* History: This file was transfered to Richard Levitte from CertCo by Kathy Weinhold in mid-spring 2000 to be included in OpenSSL or released as a patch kit. */ /* ==================================================================== * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include <stdio.h> #include <time.h> #include <cryptlib.h> #include <openssl/objects.h> #include <openssl/rand.h> #include <openssl/x509.h> #include <openssl/pem.h> #include <openssl/x509v3.h> #include <openssl/ocsp.h> /* Utility functions related to sending OCSP requests and extracting * relevant information from the response. */ /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ * pointer: useful if we want to add extensions. */ OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) { OCSP_ONEREQ *one = NULL; if (!(one = OCSP_ONEREQ_new())) goto err; if (one->reqCert) OCSP_CERTID_free(one->reqCert); one->reqCert = cid; if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one)) goto err; return one; err: OCSP_ONEREQ_free(one); return NULL; } /* Set requestorName from an X509_NAME structure */ int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm) { GENERAL_NAME *gen; gen = GENERAL_NAME_new(); if (gen == NULL) return 0; if (!X509_NAME_set(&gen->d.directoryName, nm)) { GENERAL_NAME_free(gen); return 0; } gen->type = GEN_DIRNAME; if (req->tbsRequest->requestorName) GENERAL_NAME_free(req->tbsRequest->requestorName); req->tbsRequest->requestorName = gen; return 1; } /* Add a certificate to an OCSP request */ int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) { OCSP_SIGNATURE *sig; if (!req->optionalSignature) req->optionalSignature = OCSP_SIGNATURE_new(); sig = req->optionalSignature; if (!sig) return 0; if (!cert) return 1; if (!sig->certs && !(sig->certs = sk_X509_new_null())) return 0; if(!sk_X509_push(sig->certs, cert)) return 0; CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); return 1; } /* Sign an OCSP request set the requestorName to the subjec * name of an optional signers certificate and include one * or more optional certificates in the request. Behaves * like PKCS7_sign(). */ int OCSP_request_sign(OCSP_REQUEST *req, X509 *signer, EVP_PKEY *key, const EVP_MD *dgst, STACK_OF(X509) *certs, unsigned long flags) { int i; OCSP_SIGNATURE *sig; X509 *x; if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) goto err; if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err; if (!dgst) dgst = EVP_sha1(); if (key) { if (!X509_check_private_key(signer, key)) { OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); goto err; } if (!OCSP_REQUEST_sign(req, key, dgst)) goto err; } if (!(flags & OCSP_NOCERTS)) { if(!OCSP_request_add1_cert(req, signer)) goto err; for (i = 0; i < sk_X509_num(certs); i++) { x = sk_X509_value(certs, i); if (!OCSP_request_add1_cert(req, x)) goto err; } } return 1; err: OCSP_SIGNATURE_free(req->optionalSignature); req->optionalSignature = NULL; return 0; } /* Get response status */ int OCSP_response_status(OCSP_RESPONSE *resp) { return ASN1_ENUMERATED_get(resp->responseStatus); } /* Extract basic response from OCSP_RESPONSE or NULL if * no basic response present. */ OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp) { OCSP_RESPBYTES *rb; rb = resp->responseBytes; if (!rb) { OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA); return NULL; } if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) { OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE); return NULL; } return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); } /* Return number of OCSP_SINGLERESP reponses present in * a basic response. */ int OCSP_resp_count(OCSP_BASICRESP *bs) { if (!bs) return -1; return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); } /* Extract an OCSP_SINGLERESP response with a given index */ OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) { if (!bs) return NULL; return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); } /* Look single response matching a given certificate ID */ int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) { int i; STACK_OF(OCSP_SINGLERESP) *sresp; OCSP_SINGLERESP *single; if (!bs) return -1; if (last < 0) last = 0; else last++; sresp = bs->tbsResponseData->responses; for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) { single = sk_OCSP_SINGLERESP_value(sresp, i); if (!OCSP_id_cmp(id, single->certId)) return i; } return -1; } /* Extract status information from an OCSP_SINGLERESP structure. * Note: the revtime and reason values are only set if the * certificate status is revoked. Returns numerical value of * status. */ int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, ASN1_GENERALIZEDTIME **nextupd) { int ret; OCSP_CERTSTATUS *cst; if(!single) return -1; cst = single->certStatus; ret = cst->type; if (ret == V_OCSP_CERTSTATUS_REVOKED) { OCSP_REVOKEDINFO *rev = cst->value.revoked; if (revtime) *revtime = rev->revocationTime; if (reason) { if(rev->revocationReason) *reason = ASN1_ENUMERATED_get(rev->revocationReason); else *reason = -1; } } if(thisupd) *thisupd = single->thisUpdate; if(nextupd) *nextupd = single->nextUpdate; return ret; } /* This function combines the previous ones: look up a certificate ID and * if found extract status information. Return 0 is successful. */ int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, int *reason, ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, ASN1_GENERALIZEDTIME **nextupd) { int i; OCSP_SINGLERESP *single; i = OCSP_resp_find(bs, id, -1); /* Maybe check for multiple responses and give an error? */ if(i < 0) return 0; single = OCSP_resp_get0(bs, i); i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); if(status) *status = i; return 1; } /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. * Also to avoid accepting very old responses without a nextUpdate field an optional maxage * parameter specifies the maximum age the thisUpdate field can be. */ int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) { int ret = 1; time_t t_now, t_tmp; time(&t_now); /* Check thisUpdate is valid and not more than nsec in the future */ if (!ASN1_GENERALIZEDTIME_check(thisupd)) { OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD); ret = 0; } else { t_tmp = t_now + nsec; if (X509_cmp_time(thisupd, &t_tmp) > 0) { OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID); ret = 0; } /* If maxsec specified check thisUpdate is not more than maxsec in the past */ if (maxsec >= 0) { t_tmp = t_now - maxsec; if (X509_cmp_time(thisupd, &t_tmp) < 0) { OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD); ret = 0; } } } if (!nextupd) return ret; /* Check nextUpdate is valid and not more than nsec in the past */ if (!ASN1_GENERALIZEDTIME_check(nextupd)) { OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); ret = 0; } else { t_tmp = t_now - nsec; if (X509_cmp_time(nextupd, &t_tmp) < 0) { OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED); ret = 0; } } /* Also don't allow nextUpdate to precede thisUpdate */ if (ASN1_STRING_cmp(nextupd, thisupd) < 0) { OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); ret = 0; } return ret; }