#include <openssl/ocsp.h>
#include <openssl/err.h>
#include <string.h>
static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
X509_STORE *st, unsigned long flags);
static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, unsigned long flags);
static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret);
static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, STACK_OF(OCSP_SINGLERESP) *sresp);
static int ocsp_check_delegated(X509 *x, int flags);
static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, X509_NAME *nm, STACK_OF(X509) *certs,
X509_STORE *st, unsigned long flags);
int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
X509_STORE *st, unsigned long flags)
{
X509 *signer, *x;
STACK_OF(X509) *chain = NULL;
X509_STORE_CTX ctx;
int i, ret = 0;
ret = ocsp_find_signer(&signer, bs, certs, st, flags);
if (!ret)
{
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
goto end;
}
if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
flags |= OCSP_NOVERIFY;
if (!(flags & OCSP_NOSIGS))
{
EVP_PKEY *skey;
skey = X509_get_pubkey(signer);
if (skey)
{
ret = OCSP_BASICRESP_verify(bs, skey, 0);
EVP_PKEY_free(skey);
}
if(!skey || ret <= 0)
{
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
goto end;
}
}
if (!(flags & OCSP_NOVERIFY))
{
int init_res;
if(flags & OCSP_NOCHAIN)
init_res = X509_STORE_CTX_init(&ctx, st, signer, NULL);
else
init_res = X509_STORE_CTX_init(&ctx, st, signer, bs->certs);
if(!init_res)
{
ret = -1;
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,ERR_R_X509_LIB);
goto end;
}
X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
ret = X509_verify_cert(&ctx);
chain = X509_STORE_CTX_get1_chain(&ctx);
X509_STORE_CTX_cleanup(&ctx);
if (ret <= 0)
{
i = X509_STORE_CTX_get_error(&ctx);
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_CERTIFICATE_VERIFY_ERROR);
ERR_add_error_data(2, "Verify error:",
X509_verify_cert_error_string(i));
goto end;
}
if(flags & OCSP_NOCHECKS)
{
ret = 1;
goto end;
}
ret = ocsp_check_issuer(bs, chain, flags);
if (ret != 0) goto end;
if(flags & OCSP_NOEXPLICIT) goto end;
x = sk_X509_value(chain, sk_X509_num(chain) - 1);
if(X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED)
{
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_ROOT_CA_NOT_TRUSTED);
goto end;
}
ret = 1;
}
end:
if(chain) sk_X509_pop_free(chain, X509_free);
return ret;
}
static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
X509_STORE *st, unsigned long flags)
{
X509 *signer;
OCSP_RESPID *rid = bs->tbsResponseData->responderId;
if ((signer = ocsp_find_signer_sk(certs, rid)))
{
*psigner = signer;
return 2;
}
if(!(flags & OCSP_NOINTERN) &&
(signer = ocsp_find_signer_sk(bs->certs, rid)))
{
*psigner = signer;
return 1;
}
*psigner = NULL;
return 0;
}
static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
{
int i;
unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
X509 *x;
if (id->type == V_OCSP_RESPID_NAME)
return X509_find_by_subject(certs, id->value.byName);
if (id->value.byKey->length != SHA_DIGEST_LENGTH) return NULL;
keyhash = id->value.byKey->data;
for (i = 0; i < sk_X509_num(certs); i++)
{
x = sk_X509_value(certs, i);
X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
if(!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
return x;
}
return NULL;
}
static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, unsigned long flags)
{
STACK_OF(OCSP_SINGLERESP) *sresp;
X509 *signer, *sca;
OCSP_CERTID *caid = NULL;
int i;
sresp = bs->tbsResponseData->responses;
if (sk_X509_num(chain) <= 0)
{
OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
return -1;
}
i = ocsp_check_ids(sresp, &caid);
if (i <= 0) return i;
signer = sk_X509_value(chain, 0);
if (sk_X509_num(chain) > 1)
{
sca = sk_X509_value(chain, 1);
i = ocsp_match_issuerid(sca, caid, sresp);
if (i < 0) return i;
if (i)
{
if (ocsp_check_delegated(signer, flags)) return 1;
return 0;
}
}
return ocsp_match_issuerid(signer, caid, sresp);
}
static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
{
OCSP_CERTID *tmpid, *cid;
int i, idcount;
idcount = sk_OCSP_SINGLERESP_num(sresp);
if (idcount <= 0)
{
OCSPerr(OCSP_F_OCSP_CHECK_IDS, OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
return -1;
}
cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
*ret = NULL;
for (i = 1; i < idcount; i++)
{
tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
if (OCSP_id_issuer_cmp(cid, tmpid))
{
if (OBJ_cmp(tmpid->hashAlgorithm->algorithm,
cid->hashAlgorithm->algorithm))
return 2;
return 0;
}
}
*ret = cid;
return 1;
}
static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
STACK_OF(OCSP_SINGLERESP) *sresp)
{
if(cid)
{
const EVP_MD *dgst;
X509_NAME *iname;
int mdlen;
unsigned char md[EVP_MAX_MD_SIZE];
if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm)))
{
OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID, OCSP_R_UNKNOWN_MESSAGE_DIGEST);
return -1;
}
mdlen = EVP_MD_size(dgst);
if ((cid->issuerNameHash->length != mdlen) ||
(cid->issuerKeyHash->length != mdlen))
return 0;
iname = X509_get_subject_name(cert);
if (!X509_NAME_digest(iname, dgst, md, NULL))
return -1;
if (memcmp(md, cid->issuerNameHash->data, mdlen))
return 0;
X509_pubkey_digest(cert, EVP_sha1(), md, NULL);
if (memcmp(md, cid->issuerKeyHash->data, mdlen))
return 0;
return 1;
}
else
{
int i, ret;
OCSP_CERTID *tmpid;
for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++)
{
tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
ret = ocsp_match_issuerid(cert, tmpid, NULL);
if (ret <= 0) return ret;
}
return 1;
}
}
static int ocsp_check_delegated(X509 *x, int flags)
{
X509_check_purpose(x, -1, 0);
if ((x->ex_flags & EXFLAG_XKUSAGE) &&
(x->ex_xkusage & XKU_OCSP_SIGN))
return 1;
OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
return 0;
}
int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, X509_STORE *store, unsigned long flags)
{
X509 *signer;
X509_NAME *nm;
GENERAL_NAME *gen;
int ret;
X509_STORE_CTX ctx;
if (!req->optionalSignature)
{
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
return 0;
}
gen = req->tbsRequest->requestorName;
if (!gen || gen->type != GEN_DIRNAME)
{
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
return 0;
}
nm = gen->d.directoryName;
ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
if (ret <= 0)
{
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
return 0;
}
if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
flags |= OCSP_NOVERIFY;
if (!(flags & OCSP_NOSIGS))
{
EVP_PKEY *skey;
skey = X509_get_pubkey(signer);
ret = OCSP_REQUEST_verify(req, skey);
EVP_PKEY_free(skey);
if(ret <= 0)
{
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
return 0;
}
}
if (!(flags & OCSP_NOVERIFY))
{
int init_res;
if(flags & OCSP_NOCHAIN)
init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL);
else
init_res = X509_STORE_CTX_init(&ctx, store, signer,
req->optionalSignature->certs);
if(!init_res)
{
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,ERR_R_X509_LIB);
return 0;
}
X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
ret = X509_verify_cert(&ctx);
X509_STORE_CTX_cleanup(&ctx);
if (ret <= 0)
{
ret = X509_STORE_CTX_get_error(&ctx);
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,OCSP_R_CERTIFICATE_VERIFY_ERROR);
ERR_add_error_data(2, "Verify error:",
X509_verify_cert_error_string(ret));
return 0;
}
}
return 1;
}
static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, X509_NAME *nm, STACK_OF(X509) *certs,
X509_STORE *st, unsigned long flags)
{
X509 *signer;
if(!(flags & OCSP_NOINTERN))
{
signer = X509_find_by_subject(req->optionalSignature->certs, nm);
*psigner = signer;
return 1;
}
signer = X509_find_by_subject(certs, nm);
if (signer)
{
*psigner = signer;
return 2;
}
return 0;
}