diff options
Diffstat (limited to 'crypto/heimdal/lib/hx509/revoke.c')
| -rw-r--r-- | crypto/heimdal/lib/hx509/revoke.c | 1525 |
1 files changed, 1525 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/hx509/revoke.c b/crypto/heimdal/lib/hx509/revoke.c new file mode 100644 index 0000000..cfde439 --- /dev/null +++ b/crypto/heimdal/lib/hx509/revoke.c @@ -0,0 +1,1525 @@ +/* + * Copyright (c) 2006 - 2007 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS 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 INSTITUTE OR 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. + */ + +/** + * @page page_revoke Revocation methods + * + * There are two revocation method for PKIX/X.509: CRL and OCSP. + * Revocation is needed if the private key is lost and + * stolen. Depending on how picky you are, you might want to make + * revocation for destroyed private keys too (smartcard broken), but + * that should not be a problem. + * + * CRL is a list of certifiates that have expired. + * + * OCSP is an online checking method where the requestor sends a list + * of certificates to the OCSP server to return a signed reply if they + * are valid or not. Some services sends a OCSP reply as part of the + * hand-shake to make the revoktion decision simpler/faster for the + * client. + */ + +#include "hx_locl.h" +RCSID("$Id: revoke.c 22275 2007-12-11 11:02:11Z lha $"); + +struct revoke_crl { + char *path; + time_t last_modfied; + CRLCertificateList crl; + int verified; + int failed_verify; +}; + +struct revoke_ocsp { + char *path; + time_t last_modfied; + OCSPBasicOCSPResponse ocsp; + hx509_certs certs; + hx509_cert signer; +}; + + +struct hx509_revoke_ctx_data { + unsigned ref; + struct { + struct revoke_crl *val; + size_t len; + } crls; + struct { + struct revoke_ocsp *val; + size_t len; + } ocsps; +}; + +/** + * Allocate a revokation context. Free with hx509_revoke_free(). + * + * @param context A hx509 context. + * @param ctx returns a newly allocated revokation context. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_revoke + */ + +int +hx509_revoke_init(hx509_context context, hx509_revoke_ctx *ctx) +{ + *ctx = calloc(1, sizeof(**ctx)); + if (*ctx == NULL) + return ENOMEM; + + (*ctx)->ref = 1; + (*ctx)->crls.len = 0; + (*ctx)->crls.val = NULL; + (*ctx)->ocsps.len = 0; + (*ctx)->ocsps.val = NULL; + + return 0; +} + +hx509_revoke_ctx +_hx509_revoke_ref(hx509_revoke_ctx ctx) +{ + if (ctx == NULL) + return NULL; + if (ctx->ref <= 0) + _hx509_abort("revoke ctx refcount <= 0"); + ctx->ref++; + if (ctx->ref == 0) + _hx509_abort("revoke ctx refcount == 0"); + return ctx; +} + +static void +free_ocsp(struct revoke_ocsp *ocsp) +{ + free(ocsp->path); + free_OCSPBasicOCSPResponse(&ocsp->ocsp); + hx509_certs_free(&ocsp->certs); + hx509_cert_free(ocsp->signer); +} + +/** + * Free a hx509 revokation context. + * + * @param ctx context to be freed + * + * @ingroup hx509_revoke + */ + +void +hx509_revoke_free(hx509_revoke_ctx *ctx) +{ + size_t i ; + + if (ctx == NULL || *ctx == NULL) + return; + + if ((*ctx)->ref <= 0) + _hx509_abort("revoke ctx refcount <= 0 on free"); + if (--(*ctx)->ref > 0) + return; + + for (i = 0; i < (*ctx)->crls.len; i++) { + free((*ctx)->crls.val[i].path); + free_CRLCertificateList(&(*ctx)->crls.val[i].crl); + } + + for (i = 0; i < (*ctx)->ocsps.len; i++) + free_ocsp(&(*ctx)->ocsps.val[i]); + free((*ctx)->ocsps.val); + + free((*ctx)->crls.val); + + memset(*ctx, 0, sizeof(**ctx)); + free(*ctx); + *ctx = NULL; +} + +static int +verify_ocsp(hx509_context context, + struct revoke_ocsp *ocsp, + time_t time_now, + hx509_certs certs, + hx509_cert parent) +{ + hx509_cert signer = NULL; + hx509_query q; + int ret; + + _hx509_query_clear(&q); + + /* + * Need to match on issuer too in case there are two CA that have + * issued the same name to a certificate. One example of this is + * the www.openvalidation.org test's ocsp validator. + */ + + q.match = HX509_QUERY_MATCH_ISSUER_NAME; + q.issuer_name = &_hx509_get_cert(parent)->tbsCertificate.issuer; + + switch(ocsp->ocsp.tbsResponseData.responderID.element) { + case choice_OCSPResponderID_byName: + q.match |= HX509_QUERY_MATCH_SUBJECT_NAME; + q.subject_name = &ocsp->ocsp.tbsResponseData.responderID.u.byName; + break; + case choice_OCSPResponderID_byKey: + q.match |= HX509_QUERY_MATCH_KEY_HASH_SHA1; + q.keyhash_sha1 = &ocsp->ocsp.tbsResponseData.responderID.u.byKey; + break; + } + + ret = hx509_certs_find(context, certs, &q, &signer); + if (ret && ocsp->certs) + ret = hx509_certs_find(context, ocsp->certs, &q, &signer); + if (ret) + goto out; + + /* + * If signer certificate isn't the CA certificate, lets check the + * it is the CA that signed the signer certificate and the OCSP EKU + * is set. + */ + if (hx509_cert_cmp(signer, parent) != 0) { + Certificate *p = _hx509_get_cert(parent); + Certificate *s = _hx509_get_cert(signer); + + ret = _hx509_cert_is_parent_cmp(s, p, 0); + if (ret != 0) { + ret = HX509_PARENT_NOT_CA; + hx509_set_error_string(context, 0, ret, "Revoke OSCP signer is " + "doesn't have CA as signer certificate"); + goto out; + } + + ret = _hx509_verify_signature_bitstring(context, + p, + &s->signatureAlgorithm, + &s->tbsCertificate._save, + &s->signatureValue); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "OSCP signer signature invalid"); + goto out; + } + + ret = hx509_cert_check_eku(context, signer, + oid_id_pkix_kp_OCSPSigning(), 0); + if (ret) + goto out; + } + + ret = _hx509_verify_signature_bitstring(context, + _hx509_get_cert(signer), + &ocsp->ocsp.signatureAlgorithm, + &ocsp->ocsp.tbsResponseData._save, + &ocsp->ocsp.signature); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "OSCP signature invalid"); + goto out; + } + + ocsp->signer = signer; + signer = NULL; +out: + if (signer) + hx509_cert_free(signer); + + return ret; +} + +/* + * + */ + +static int +parse_ocsp_basic(const void *data, size_t length, OCSPBasicOCSPResponse *basic) +{ + OCSPResponse resp; + size_t size; + int ret; + + memset(basic, 0, sizeof(*basic)); + + ret = decode_OCSPResponse(data, length, &resp, &size); + if (ret) + return ret; + if (length != size) { + free_OCSPResponse(&resp); + return ASN1_EXTRA_DATA; + } + + switch (resp.responseStatus) { + case successful: + break; + default: + free_OCSPResponse(&resp); + return HX509_REVOKE_WRONG_DATA; + } + + if (resp.responseBytes == NULL) { + free_OCSPResponse(&resp); + return EINVAL; + } + + ret = der_heim_oid_cmp(&resp.responseBytes->responseType, + oid_id_pkix_ocsp_basic()); + if (ret != 0) { + free_OCSPResponse(&resp); + return HX509_REVOKE_WRONG_DATA; + } + + ret = decode_OCSPBasicOCSPResponse(resp.responseBytes->response.data, + resp.responseBytes->response.length, + basic, + &size); + if (ret) { + free_OCSPResponse(&resp); + return ret; + } + if (size != resp.responseBytes->response.length) { + free_OCSPResponse(&resp); + free_OCSPBasicOCSPResponse(basic); + return ASN1_EXTRA_DATA; + } + free_OCSPResponse(&resp); + + return 0; +} + +/* + * + */ + +static int +load_ocsp(hx509_context context, struct revoke_ocsp *ocsp) +{ + OCSPBasicOCSPResponse basic; + hx509_certs certs = NULL; + size_t length; + struct stat sb; + void *data; + int ret; + + ret = _hx509_map_file(ocsp->path, &data, &length, &sb); + if (ret) + return ret; + + ret = parse_ocsp_basic(data, length, &basic); + _hx509_unmap_file(data, length); + if (ret) { + hx509_set_error_string(context, 0, ret, + "Failed to parse OCSP response"); + return ret; + } + + if (basic.certs) { + int i; + + ret = hx509_certs_init(context, "MEMORY:ocsp-certs", 0, + NULL, &certs); + if (ret) { + free_OCSPBasicOCSPResponse(&basic); + return ret; + } + + for (i = 0; i < basic.certs->len; i++) { + hx509_cert c; + + ret = hx509_cert_init(context, &basic.certs->val[i], &c); + if (ret) + continue; + + ret = hx509_certs_add(context, certs, c); + hx509_cert_free(c); + if (ret) + continue; + } + } + + ocsp->last_modfied = sb.st_mtime; + + free_OCSPBasicOCSPResponse(&ocsp->ocsp); + hx509_certs_free(&ocsp->certs); + hx509_cert_free(ocsp->signer); + + ocsp->ocsp = basic; + ocsp->certs = certs; + ocsp->signer = NULL; + + return 0; +} + +/** + * Add a OCSP file to the revokation context. + * + * @param context hx509 context + * @param ctx hx509 revokation context + * @param path path to file that is going to be added to the context. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_revoke + */ + +int +hx509_revoke_add_ocsp(hx509_context context, + hx509_revoke_ctx ctx, + const char *path) +{ + void *data; + int ret; + size_t i; + + if (strncmp(path, "FILE:", 5) != 0) { + hx509_set_error_string(context, 0, HX509_UNSUPPORTED_OPERATION, + "unsupport type in %s", path); + return HX509_UNSUPPORTED_OPERATION; + } + + path += 5; + + for (i = 0; i < ctx->ocsps.len; i++) { + if (strcmp(ctx->ocsps.val[0].path, path) == 0) + return 0; + } + + data = realloc(ctx->ocsps.val, + (ctx->ocsps.len + 1) * sizeof(ctx->ocsps.val[0])); + if (data == NULL) { + hx509_clear_error_string(context); + return ENOMEM; + } + + ctx->ocsps.val = data; + + memset(&ctx->ocsps.val[ctx->ocsps.len], 0, + sizeof(ctx->ocsps.val[0])); + + ctx->ocsps.val[ctx->ocsps.len].path = strdup(path); + if (ctx->ocsps.val[ctx->ocsps.len].path == NULL) { + hx509_clear_error_string(context); + return ENOMEM; + } + + ret = load_ocsp(context, &ctx->ocsps.val[ctx->ocsps.len]); + if (ret) { + free(ctx->ocsps.val[ctx->ocsps.len].path); + return ret; + } + ctx->ocsps.len++; + + return ret; +} + +/* + * + */ + +static int +verify_crl(hx509_context context, + hx509_revoke_ctx ctx, + CRLCertificateList *crl, + time_t time_now, + hx509_certs certs, + hx509_cert parent) +{ + hx509_cert signer; + hx509_query q; + time_t t; + int ret; + + t = _hx509_Time2time_t(&crl->tbsCertList.thisUpdate); + if (t > time_now) { + hx509_set_error_string(context, 0, HX509_CRL_USED_BEFORE_TIME, + "CRL used before time"); + return HX509_CRL_USED_BEFORE_TIME; + } + + if (crl->tbsCertList.nextUpdate == NULL) { + hx509_set_error_string(context, 0, HX509_CRL_INVALID_FORMAT, + "CRL missing nextUpdate"); + return HX509_CRL_INVALID_FORMAT; + } + + t = _hx509_Time2time_t(crl->tbsCertList.nextUpdate); + if (t < time_now) { + hx509_set_error_string(context, 0, HX509_CRL_USED_AFTER_TIME, + "CRL used after time"); + return HX509_CRL_USED_AFTER_TIME; + } + + _hx509_query_clear(&q); + + /* + * If it's the signer have CRLSIGN bit set, use that as the signer + * cert for the certificate, otherwise, search for a certificate. + */ + if (_hx509_check_key_usage(context, parent, 1 << 6, FALSE) == 0) { + signer = hx509_cert_ref(parent); + } else { + q.match = HX509_QUERY_MATCH_SUBJECT_NAME; + q.match |= HX509_QUERY_KU_CRLSIGN; + q.subject_name = &crl->tbsCertList.issuer; + + ret = hx509_certs_find(context, certs, &q, &signer); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "Failed to find certificate for CRL"); + return ret; + } + } + + ret = _hx509_verify_signature_bitstring(context, + _hx509_get_cert(signer), + &crl->signatureAlgorithm, + &crl->tbsCertList._save, + &crl->signatureValue); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "CRL signature invalid"); + goto out; + } + + /* + * If signer is not CA cert, need to check revoke status of this + * CRL signing cert too, this include all parent CRL signer cert + * up to the root *sigh*, assume root at least hve CERTSIGN flag + * set. + */ + while (_hx509_check_key_usage(context, signer, 1 << 5, TRUE)) { + hx509_cert crl_parent; + + _hx509_query_clear(&q); + + q.match = HX509_QUERY_MATCH_SUBJECT_NAME; + q.match |= HX509_QUERY_KU_CRLSIGN; + q.subject_name = &_hx509_get_cert(signer)->tbsCertificate.issuer; + + ret = hx509_certs_find(context, certs, &q, &crl_parent); + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "Failed to find parent of CRL signer"); + goto out; + } + + ret = hx509_revoke_verify(context, + ctx, + certs, + time_now, + signer, + crl_parent); + hx509_cert_free(signer); + signer = crl_parent; + if (ret) { + hx509_set_error_string(context, HX509_ERROR_APPEND, ret, + "Failed to verify revoke " + "status of CRL signer"); + goto out; + } + } + +out: + hx509_cert_free(signer); + + return ret; +} + +static int +load_crl(const char *path, time_t *t, CRLCertificateList *crl) +{ + size_t length, size; + struct stat sb; + void *data; + int ret; + + memset(crl, 0, sizeof(*crl)); + + ret = _hx509_map_file(path, &data, &length, &sb); + if (ret) + return ret; + + *t = sb.st_mtime; + + ret = decode_CRLCertificateList(data, length, crl, &size); + _hx509_unmap_file(data, length); + if (ret) + return ret; + + /* check signature is aligned */ + if (crl->signatureValue.length & 7) { + free_CRLCertificateList(crl); + return HX509_CRYPTO_SIG_INVALID_FORMAT; + } + return 0; +} + +/** + * Add a CRL file to the revokation context. + * + * @param context hx509 context + * @param ctx hx509 revokation context + * @param path path to file that is going to be added to the context. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_revoke + */ + +int +hx509_revoke_add_crl(hx509_context context, + hx509_revoke_ctx ctx, + const char *path) +{ + void *data; + size_t i; + int ret; + + if (strncmp(path, "FILE:", 5) != 0) { + hx509_set_error_string(context, 0, HX509_UNSUPPORTED_OPERATION, + "unsupport type in %s", path); + return HX509_UNSUPPORTED_OPERATION; + } + + + path += 5; + + for (i = 0; i < ctx->crls.len; i++) { + if (strcmp(ctx->crls.val[0].path, path) == 0) + return 0; + } + + data = realloc(ctx->crls.val, + (ctx->crls.len + 1) * sizeof(ctx->crls.val[0])); + if (data == NULL) { + hx509_clear_error_string(context); + return ENOMEM; + } + ctx->crls.val = data; + + memset(&ctx->crls.val[ctx->crls.len], 0, sizeof(ctx->crls.val[0])); + + ctx->crls.val[ctx->crls.len].path = strdup(path); + if (ctx->crls.val[ctx->crls.len].path == NULL) { + hx509_clear_error_string(context); + return ENOMEM; + } + + ret = load_crl(path, + &ctx->crls.val[ctx->crls.len].last_modfied, + &ctx->crls.val[ctx->crls.len].crl); + if (ret) { + free(ctx->crls.val[ctx->crls.len].path); + return ret; + } + + ctx->crls.len++; + + return ret; +} + +/** + * Check that a certificate is not expired according to a revokation + * context. Also need the parent certificte to the check OCSP + * parent identifier. + * + * @param context hx509 context + * @param ctx hx509 revokation context + * @param certs + * @param now + * @param cert + * @param parent_cert + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_revoke + */ + + +int +hx509_revoke_verify(hx509_context context, + hx509_revoke_ctx ctx, + hx509_certs certs, + time_t now, + hx509_cert cert, + hx509_cert parent_cert) +{ + const Certificate *c = _hx509_get_cert(cert); + const Certificate *p = _hx509_get_cert(parent_cert); + unsigned long i, j, k; + int ret; + + hx509_clear_error_string(context); + + for (i = 0; i < ctx->ocsps.len; i++) { + struct revoke_ocsp *ocsp = &ctx->ocsps.val[i]; + struct stat sb; + + /* check this ocsp apply to this cert */ + + /* check if there is a newer version of the file */ + ret = stat(ocsp->path, &sb); + if (ret == 0 && ocsp->last_modfied != sb.st_mtime) { + ret = load_ocsp(context, ocsp); + if (ret) + continue; + } + + /* verify signature in ocsp if not already done */ + if (ocsp->signer == NULL) { + ret = verify_ocsp(context, ocsp, now, certs, parent_cert); + if (ret) + continue; + } + + for (j = 0; j < ocsp->ocsp.tbsResponseData.responses.len; j++) { + heim_octet_string os; + + ret = der_heim_integer_cmp(&ocsp->ocsp.tbsResponseData.responses.val[j].certID.serialNumber, + &c->tbsCertificate.serialNumber); + if (ret != 0) + continue; + + /* verify issuer hashes hash */ + ret = _hx509_verify_signature(context, + NULL, + &ocsp->ocsp.tbsResponseData.responses.val[i].certID.hashAlgorithm, + &c->tbsCertificate.issuer._save, + &ocsp->ocsp.tbsResponseData.responses.val[i].certID.issuerNameHash); + if (ret != 0) + continue; + + os.data = p->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.data; + os.length = p->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.length / 8; + + ret = _hx509_verify_signature(context, + NULL, + &ocsp->ocsp.tbsResponseData.responses.val[j].certID.hashAlgorithm, + &os, + &ocsp->ocsp.tbsResponseData.responses.val[j].certID.issuerKeyHash); + if (ret != 0) + continue; + + switch (ocsp->ocsp.tbsResponseData.responses.val[j].certStatus.element) { + case choice_OCSPCertStatus_good: + break; + case choice_OCSPCertStatus_revoked: + hx509_set_error_string(context, 0, + HX509_CERT_REVOKED, + "Certificate revoked by issuer in OCSP"); + return HX509_CERT_REVOKED; + case choice_OCSPCertStatus_unknown: + continue; + } + + /* don't allow the update to be in the future */ + if (ocsp->ocsp.tbsResponseData.responses.val[j].thisUpdate > + now + context->ocsp_time_diff) + continue; + + /* don't allow the next update to be in the past */ + if (ocsp->ocsp.tbsResponseData.responses.val[j].nextUpdate) { + if (*ocsp->ocsp.tbsResponseData.responses.val[j].nextUpdate < now) + continue; + } else + /* Should force a refetch, but can we ? */; + + return 0; + } + } + + for (i = 0; i < ctx->crls.len; i++) { + struct revoke_crl *crl = &ctx->crls.val[i]; + struct stat sb; + + /* check if cert.issuer == crls.val[i].crl.issuer */ + ret = _hx509_name_cmp(&c->tbsCertificate.issuer, + &crl->crl.tbsCertList.issuer); + if (ret) + continue; + + ret = stat(crl->path, &sb); + if (ret == 0 && crl->last_modfied != sb.st_mtime) { + CRLCertificateList cl; + + ret = load_crl(crl->path, &crl->last_modfied, &cl); + if (ret == 0) { + free_CRLCertificateList(&crl->crl); + crl->crl = cl; + crl->verified = 0; + crl->failed_verify = 0; + } + } + if (crl->failed_verify) + continue; + + /* verify signature in crl if not already done */ + if (crl->verified == 0) { + ret = verify_crl(context, ctx, &crl->crl, now, certs, parent_cert); + if (ret) { + crl->failed_verify = 1; + continue; + } + crl->verified = 1; + } + + if (crl->crl.tbsCertList.crlExtensions) { + for (j = 0; j < crl->crl.tbsCertList.crlExtensions->len; j++) { + if (crl->crl.tbsCertList.crlExtensions->val[j].critical) { + hx509_set_error_string(context, 0, + HX509_CRL_UNKNOWN_EXTENSION, + "Unknown CRL extension"); + return HX509_CRL_UNKNOWN_EXTENSION; + } + } + } + + if (crl->crl.tbsCertList.revokedCertificates == NULL) + return 0; + + /* check if cert is in crl */ + for (j = 0; j < crl->crl.tbsCertList.revokedCertificates->len; j++) { + time_t t; + + ret = der_heim_integer_cmp(&crl->crl.tbsCertList.revokedCertificates->val[j].userCertificate, + &c->tbsCertificate.serialNumber); + if (ret != 0) + continue; + + t = _hx509_Time2time_t(&crl->crl.tbsCertList.revokedCertificates->val[j].revocationDate); + if (t > now) + continue; + + if (crl->crl.tbsCertList.revokedCertificates->val[j].crlEntryExtensions) + for (k = 0; k < crl->crl.tbsCertList.revokedCertificates->val[j].crlEntryExtensions->len; k++) + if (crl->crl.tbsCertList.revokedCertificates->val[j].crlEntryExtensions->val[k].critical) + return HX509_CRL_UNKNOWN_EXTENSION; + + hx509_set_error_string(context, 0, + HX509_CERT_REVOKED, + "Certificate revoked by issuer in CRL"); + return HX509_CERT_REVOKED; + } + + return 0; + } + + + if (context->flags & HX509_CTX_VERIFY_MISSING_OK) + return 0; + hx509_set_error_string(context, HX509_ERROR_APPEND, + HX509_REVOKE_STATUS_MISSING, + "No revoke status found for " + "certificates"); + return HX509_REVOKE_STATUS_MISSING; +} + +struct ocsp_add_ctx { + OCSPTBSRequest *req; + hx509_certs certs; + const AlgorithmIdentifier *digest; + hx509_cert parent; +}; + +static int +add_to_req(hx509_context context, void *ptr, hx509_cert cert) +{ + struct ocsp_add_ctx *ctx = ptr; + OCSPInnerRequest *one; + hx509_cert parent = NULL; + Certificate *p, *c = _hx509_get_cert(cert); + heim_octet_string os; + int ret; + hx509_query q; + void *d; + + d = realloc(ctx->req->requestList.val, + sizeof(ctx->req->requestList.val[0]) * + (ctx->req->requestList.len + 1)); + if (d == NULL) + return ENOMEM; + ctx->req->requestList.val = d; + + one = &ctx->req->requestList.val[ctx->req->requestList.len]; + memset(one, 0, sizeof(*one)); + + _hx509_query_clear(&q); + + q.match |= HX509_QUERY_FIND_ISSUER_CERT; + q.subject = c; + + ret = hx509_certs_find(context, ctx->certs, &q, &parent); + if (ret) + goto out; + + if (ctx->parent) { + if (hx509_cert_cmp(ctx->parent, parent) != 0) { + ret = HX509_REVOKE_NOT_SAME_PARENT; + hx509_set_error_string(context, 0, ret, + "Not same parent certifate as " + "last certificate in request"); + goto out; + } + } else + ctx->parent = hx509_cert_ref(parent); + + p = _hx509_get_cert(parent); + + ret = copy_AlgorithmIdentifier(ctx->digest, &one->reqCert.hashAlgorithm); + if (ret) + goto out; + + ret = _hx509_create_signature(context, + NULL, + &one->reqCert.hashAlgorithm, + &c->tbsCertificate.issuer._save, + NULL, + &one->reqCert.issuerNameHash); + if (ret) + goto out; + + os.data = p->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.data; + os.length = + p->tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.length / 8; + + ret = _hx509_create_signature(context, + NULL, + &one->reqCert.hashAlgorithm, + &os, + NULL, + &one->reqCert.issuerKeyHash); + if (ret) + goto out; + + ret = copy_CertificateSerialNumber(&c->tbsCertificate.serialNumber, + &one->reqCert.serialNumber); + if (ret) + goto out; + + ctx->req->requestList.len++; +out: + hx509_cert_free(parent); + if (ret) { + free_OCSPInnerRequest(one); + memset(one, 0, sizeof(*one)); + } + + return ret; +} + +/** + * Create an OCSP request for a set of certificates. + * + * @param context a hx509 context + * @param reqcerts list of certificates to request ocsp data for + * @param pool certificate pool to use when signing + * @param signer certificate to use to sign the request + * @param digest the signing algorithm in the request, if NULL use the + * default signature algorithm, + * @param request the encoded request, free with free_heim_octet_string(). + * @param nonce nonce in the request, free with free_heim_octet_string(). + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_revoke + */ + +int +hx509_ocsp_request(hx509_context context, + hx509_certs reqcerts, + hx509_certs pool, + hx509_cert signer, + const AlgorithmIdentifier *digest, + heim_octet_string *request, + heim_octet_string *nonce) +{ + OCSPRequest req; + size_t size; + int ret; + struct ocsp_add_ctx ctx; + Extensions *es; + + memset(&req, 0, sizeof(req)); + + if (digest == NULL) + digest = _hx509_crypto_default_digest_alg; + + ctx.req = &req.tbsRequest; + ctx.certs = pool; + ctx.digest = digest; + ctx.parent = NULL; + + ret = hx509_certs_iter(context, reqcerts, add_to_req, &ctx); + hx509_cert_free(ctx.parent); + if (ret) + goto out; + + if (nonce) { + req.tbsRequest.requestExtensions = + calloc(1, sizeof(*req.tbsRequest.requestExtensions)); + if (req.tbsRequest.requestExtensions == NULL) { + ret = ENOMEM; + goto out; + } + + es = req.tbsRequest.requestExtensions; + + es->val = calloc(es->len, sizeof(es->val[0])); + if (es->val == NULL) { + ret = ENOMEM; + goto out; + } + es->len = 1; + + ret = der_copy_oid(oid_id_pkix_ocsp_nonce(), &es->val[0].extnID); + if (ret) { + free_OCSPRequest(&req); + return ret; + } + + es->val[0].extnValue.data = malloc(10); + if (es->val[0].extnValue.data == NULL) { + ret = ENOMEM; + goto out; + } + es->val[0].extnValue.length = 10; + + ret = RAND_bytes(es->val[0].extnValue.data, + es->val[0].extnValue.length); + if (ret != 1) { + ret = HX509_CRYPTO_INTERNAL_ERROR; + goto out; + } + ret = der_copy_octet_string(nonce, &es->val[0].extnValue); + if (ret) { + ret = ENOMEM; + goto out; + } + } + + ASN1_MALLOC_ENCODE(OCSPRequest, request->data, request->length, + &req, &size, ret); + free_OCSPRequest(&req); + if (ret) + goto out; + if (size != request->length) + _hx509_abort("internal ASN.1 encoder error"); + + return 0; + +out: + free_OCSPRequest(&req); + return ret; +} + +static char * +printable_time(time_t t) +{ + static char s[128]; + strlcpy(s, ctime(&t)+ 4, sizeof(s)); + s[20] = 0; + return s; +} + +/** + * Print the OCSP reply stored in a file. + * + * @param context a hx509 context + * @param path path to a file with a OCSP reply + * @param out the out FILE descriptor to print the reply on + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_revoke + */ + +int +hx509_revoke_ocsp_print(hx509_context context, const char *path, FILE *out) +{ + struct revoke_ocsp ocsp; + int ret, i; + + if (out == NULL) + out = stdout; + + memset(&ocsp, 0, sizeof(ocsp)); + + ocsp.path = strdup(path); + if (ocsp.path == NULL) + return ENOMEM; + + ret = load_ocsp(context, &ocsp); + if (ret) { + free_ocsp(&ocsp); + return ret; + } + + fprintf(out, "signer: "); + + switch(ocsp.ocsp.tbsResponseData.responderID.element) { + case choice_OCSPResponderID_byName: { + hx509_name n; + char *s; + _hx509_name_from_Name(&ocsp.ocsp.tbsResponseData.responderID.u.byName, &n); + hx509_name_to_string(n, &s); + hx509_name_free(&n); + fprintf(out, " byName: %s\n", s); + free(s); + break; + } + case choice_OCSPResponderID_byKey: { + char *s; + hex_encode(ocsp.ocsp.tbsResponseData.responderID.u.byKey.data, + ocsp.ocsp.tbsResponseData.responderID.u.byKey.length, + &s); + fprintf(out, " byKey: %s\n", s); + free(s); + break; + } + default: + _hx509_abort("choice_OCSPResponderID unknown"); + break; + } + + fprintf(out, "producedAt: %s\n", + printable_time(ocsp.ocsp.tbsResponseData.producedAt)); + + fprintf(out, "replies: %d\n", ocsp.ocsp.tbsResponseData.responses.len); + + for (i = 0; i < ocsp.ocsp.tbsResponseData.responses.len; i++) { + const char *status; + switch (ocsp.ocsp.tbsResponseData.responses.val[i].certStatus.element) { + case choice_OCSPCertStatus_good: + status = "good"; + break; + case choice_OCSPCertStatus_revoked: + status = "revoked"; + break; + case choice_OCSPCertStatus_unknown: + status = "unknown"; + break; + default: + status = "element unknown"; + } + + fprintf(out, "\t%d. status: %s\n", i, status); + + fprintf(out, "\tthisUpdate: %s\n", + printable_time(ocsp.ocsp.tbsResponseData.responses.val[i].thisUpdate)); + if (ocsp.ocsp.tbsResponseData.responses.val[i].nextUpdate) + fprintf(out, "\tproducedAt: %s\n", + printable_time(ocsp.ocsp.tbsResponseData.responses.val[i].thisUpdate)); + + } + + fprintf(out, "appended certs:\n"); + if (ocsp.certs) + ret = hx509_certs_iter(context, ocsp.certs, hx509_ci_print_names, out); + + free_ocsp(&ocsp); + return ret; +} + +/** + * Verify that the certificate is part of the OCSP reply and it's not + * expired. Doesn't verify signature the OCSP reply or it's done by a + * authorized sender, that is assumed to be already done. + * + * @param context a hx509 context + * @param now the time right now, if 0, use the current time. + * @param cert the certificate to verify + * @param flags flags control the behavior + * @param data pointer to the encode ocsp reply + * @param length the length of the encode ocsp reply + * @param expiration return the time the OCSP will expire and need to + * be rechecked. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_verify + */ + +int +hx509_ocsp_verify(hx509_context context, + time_t now, + hx509_cert cert, + int flags, + const void *data, size_t length, + time_t *expiration) +{ + const Certificate *c = _hx509_get_cert(cert); + OCSPBasicOCSPResponse basic; + int ret, i; + + if (now == 0) + now = time(NULL); + + *expiration = 0; + + ret = parse_ocsp_basic(data, length, &basic); + if (ret) { + hx509_set_error_string(context, 0, ret, + "Failed to parse OCSP response"); + return ret; + } + + for (i = 0; i < basic.tbsResponseData.responses.len; i++) { + + ret = der_heim_integer_cmp(&basic.tbsResponseData.responses.val[i].certID.serialNumber, + &c->tbsCertificate.serialNumber); + if (ret != 0) + continue; + + /* verify issuer hashes hash */ + ret = _hx509_verify_signature(context, + NULL, + &basic.tbsResponseData.responses.val[i].certID.hashAlgorithm, + &c->tbsCertificate.issuer._save, + &basic.tbsResponseData.responses.val[i].certID.issuerNameHash); + if (ret != 0) + continue; + + switch (basic.tbsResponseData.responses.val[i].certStatus.element) { + case choice_OCSPCertStatus_good: + break; + case choice_OCSPCertStatus_revoked: + case choice_OCSPCertStatus_unknown: + continue; + } + + /* don't allow the update to be in the future */ + if (basic.tbsResponseData.responses.val[i].thisUpdate > + now + context->ocsp_time_diff) + continue; + + /* don't allow the next update to be in the past */ + if (basic.tbsResponseData.responses.val[i].nextUpdate) { + if (*basic.tbsResponseData.responses.val[i].nextUpdate < now) + continue; + *expiration = *basic.tbsResponseData.responses.val[i].nextUpdate; + } else + *expiration = now; + + free_OCSPBasicOCSPResponse(&basic); + return 0; + } + + free_OCSPBasicOCSPResponse(&basic); + + { + hx509_name name; + char *subject; + + ret = hx509_cert_get_subject(cert, &name); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + ret = hx509_name_to_string(name, &subject); + hx509_name_free(&name); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + hx509_set_error_string(context, 0, HX509_CERT_NOT_IN_OCSP, + "Certificate %s not in OCSP response " + "or not good", + subject); + free(subject); + } +out: + return HX509_CERT_NOT_IN_OCSP; +} + +struct hx509_crl { + hx509_certs revoked; + time_t expire; +}; + +/** + * Create a CRL context. Use hx509_crl_free() to free the CRL context. + * + * @param context a hx509 context. + * @param crl return pointer to a newly allocated CRL context. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_verify + */ + +int +hx509_crl_alloc(hx509_context context, hx509_crl *crl) +{ + int ret; + + *crl = calloc(1, sizeof(**crl)); + if (*crl == NULL) { + hx509_set_error_string(context, 0, ENOMEM, "out of memory"); + return ENOMEM; + } + + ret = hx509_certs_init(context, "MEMORY:crl", 0, NULL, &(*crl)->revoked); + if (ret) { + free(*crl); + *crl = NULL; + return ret; + } + (*crl)->expire = 0; + return ret; +} + +/** + * Add revoked certificate to an CRL context. + * + * @param context a hx509 context. + * @param crl the CRL to add the revoked certificate to. + * @param certs keyset of certificate to revoke. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_verify + */ + +int +hx509_crl_add_revoked_certs(hx509_context context, + hx509_crl crl, + hx509_certs certs) +{ + return hx509_certs_merge(context, crl->revoked, certs); +} + +/** + * Set the lifetime of a CRL context. + * + * @param context a hx509 context. + * @param crl a CRL context + * @param delta delta time the certificate is valid, library adds the + * current time to this. + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_verify + */ + +int +hx509_crl_lifetime(hx509_context context, hx509_crl crl, int delta) +{ + crl->expire = time(NULL) + delta; + return 0; +} + +/** + * Free a CRL context. + * + * @param context a hx509 context. + * @param crl a CRL context to free. + * + * @ingroup hx509_verify + */ + +void +hx509_crl_free(hx509_context context, hx509_crl *crl) +{ + if (*crl == NULL) + return; + hx509_certs_free(&(*crl)->revoked); + memset(*crl, 0, sizeof(**crl)); + free(*crl); + *crl = NULL; +} + +static int +add_revoked(hx509_context context, void *ctx, hx509_cert cert) +{ + TBSCRLCertList *c = ctx; + unsigned int num; + void *ptr; + int ret; + + num = c->revokedCertificates->len; + ptr = realloc(c->revokedCertificates->val, + (num + 1) * sizeof(c->revokedCertificates->val[0])); + if (ptr == NULL) { + hx509_clear_error_string(context); + return ENOMEM; + } + c->revokedCertificates->val = ptr; + + ret = hx509_cert_get_serialnumber(cert, + &c->revokedCertificates->val[num].userCertificate); + if (ret) { + hx509_clear_error_string(context); + return ret; + } + c->revokedCertificates->val[num].revocationDate.element = + choice_Time_generalTime; + c->revokedCertificates->val[num].revocationDate.u.generalTime = + time(NULL) - 3600 * 24; + c->revokedCertificates->val[num].crlEntryExtensions = NULL; + + c->revokedCertificates->len++; + + return 0; +} + +/** + * Sign a CRL and return an encode certificate. + * + * @param context a hx509 context. + * @param signer certificate to sign the CRL with + * @param crl the CRL to sign + * @param os return the signed and encoded CRL, free with + * free_heim_octet_string() + * + * @return An hx509 error code, see hx509_get_error_string(). + * + * @ingroup hx509_verify + */ + +int +hx509_crl_sign(hx509_context context, + hx509_cert signer, + hx509_crl crl, + heim_octet_string *os) +{ + const AlgorithmIdentifier *sigalg = _hx509_crypto_default_sig_alg; + CRLCertificateList c; + size_t size; + int ret; + hx509_private_key signerkey; + + memset(&c, 0, sizeof(c)); + + signerkey = _hx509_cert_private_key(signer); + if (signerkey == NULL) { + ret = HX509_PRIVATE_KEY_MISSING; + hx509_set_error_string(context, 0, ret, + "Private key missing for CRL signing"); + return ret; + } + + c.tbsCertList.version = malloc(sizeof(*c.tbsCertList.version)); + if (c.tbsCertList.version == NULL) { + hx509_set_error_string(context, 0, ENOMEM, "out of memory"); + return ENOMEM; + } + + *c.tbsCertList.version = 1; + + ret = copy_AlgorithmIdentifier(sigalg, &c.tbsCertList.signature); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + + ret = copy_Name(&_hx509_get_cert(signer)->tbsCertificate.issuer, + &c.tbsCertList.issuer); + if (ret) { + hx509_clear_error_string(context); + goto out; + } + + c.tbsCertList.thisUpdate.element = choice_Time_generalTime; + c.tbsCertList.thisUpdate.u.generalTime = time(NULL) - 24 * 3600; + + c.tbsCertList.nextUpdate = malloc(sizeof(*c.tbsCertList.nextUpdate)); + if (c.tbsCertList.nextUpdate == NULL) { + hx509_set_error_string(context, 0, ENOMEM, "out of memory"); + ret = ENOMEM; + goto out; + } + + { + time_t next = crl->expire; + if (next == 0) + next = time(NULL) + 24 * 3600 * 365; + + c.tbsCertList.nextUpdate->element = choice_Time_generalTime; + c.tbsCertList.nextUpdate->u.generalTime = next; + } + + c.tbsCertList.revokedCertificates = + calloc(1, sizeof(*c.tbsCertList.revokedCertificates)); + if (c.tbsCertList.revokedCertificates == NULL) { + hx509_set_error_string(context, 0, ENOMEM, "out of memory"); + ret = ENOMEM; + goto out; + } + c.tbsCertList.crlExtensions = NULL; + + ret = hx509_certs_iter(context, crl->revoked, add_revoked, &c.tbsCertList); + if (ret) + goto out; + + /* if not revoked certs, remove OPTIONAL entry */ + if (c.tbsCertList.revokedCertificates->len == 0) { + free(c.tbsCertList.revokedCertificates); + c.tbsCertList.revokedCertificates = NULL; + } + + ASN1_MALLOC_ENCODE(TBSCRLCertList, os->data, os->length, + &c.tbsCertList, &size, ret); + if (ret) { + hx509_set_error_string(context, 0, ret, "failed to encode tbsCRL"); + goto out; + } + if (size != os->length) + _hx509_abort("internal ASN.1 encoder error"); + + + ret = _hx509_create_signature_bitstring(context, + signerkey, + sigalg, + os, + &c.signatureAlgorithm, + &c.signatureValue); + free(os->data); + + ASN1_MALLOC_ENCODE(CRLCertificateList, os->data, os->length, + &c, &size, ret); + free_CRLCertificateList(&c); + if (ret) { + hx509_set_error_string(context, 0, ret, "failed to encode CRL"); + goto out; + } + if (size != os->length) + _hx509_abort("internal ASN.1 encoder error"); + + return 0; + +out: + free_CRLCertificateList(&c); + return ret; +} |
