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heimdal/lib/hx509/revoke.c
Nicolas Williams 52a562a3a4 Misc fixes (coverity)
2016-11-18 22:21:45 -06:00

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/*
* 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"
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 int 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 on ref");
ctx->ref++;
if (ctx->ref == UINT_MAX)
_hx509_abort("revoke ctx refcount == UINT_MAX on ref");
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 OCSP signer is "
"doesn't have CA as signer certificate");
goto out;
}
ret = _hx509_verify_signature_bitstring(context,
parent,
&s->signatureAlgorithm,
&s->tbsCertificate._save,
&s->signatureValue);
if (ret) {
hx509_set_error_string(context, HX509_ERROR_APPEND, ret,
"OCSP signer signature invalid");
goto out;
}
ret = hx509_cert_check_eku(context, signer,
&asn1_oid_id_pkix_kp_OCSPSigning, 0);
if (ret)
goto out;
}
ret = _hx509_verify_signature_bitstring(context,
signer,
&ocsp->ocsp.signatureAlgorithm,
&ocsp->ocsp.tbsResponseData._save,
&ocsp->ocsp.signature);
if (ret) {
hx509_set_error_string(context, HX509_ERROR_APPEND, ret,
"OCSP 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,
&asn1_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 = rk_undumpdata(ocsp->path, &data, &length);
if (ret)
return ret;
ret = stat(ocsp->path, &sb);
if (ret) {
rk_xfree(data);
return errno;
}
ret = parse_ocsp_basic(data, length, &basic);
rk_xfree(data);
if (ret) {
hx509_set_error_string(context, 0, ret,
"Failed to parse OCSP response");
return ret;
}
if (basic.certs) {
size_t 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;
c = hx509_cert_init(context, &basic.certs->val[i], NULL);
if (c == NULL)
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,
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
crl_parser(hx509_context context, const char *type,
const hx509_pem_header *header,
const void *data, size_t len, void *ctx)
{
CRLCertificateList *crl = (CRLCertificateList *)ctx;
size_t size;
int ret;
if (strcasecmp("X509 CRL", type) != 0)
return HX509_CRYPTO_SIG_INVALID_FORMAT;
ret = decode_CRLCertificateList(data, len, crl, &size);
if (ret)
return ret;
/* check signature is aligned */
if (crl->signatureValue.length & 7) {
free_CRLCertificateList(crl);
return HX509_CRYPTO_SIG_INVALID_FORMAT;
}
return 0;
}
static int
load_crl(hx509_context context, const char *path, time_t *t, CRLCertificateList *crl)
{
struct stat sb;
size_t length;
void *data;
FILE *f;
int ret;
memset(crl, 0, sizeof(*crl));
ret = stat(path, &sb);
if (ret)
return errno;
*t = sb.st_mtime;
if ((f = fopen(path, "r")) == NULL)
return errno;
rk_cloexec_file(f);
ret = hx509_pem_read(context, f, crl_parser, crl);
fclose(f);
if (ret == HX509_PARSING_KEY_FAILED) {
ret = rk_undumpdata(path, &data, &length);
if (ret)
return ret;
ret = crl_parser(context, "X509 CRL", NULL, data, length, crl);
rk_xfree(data);
}
return ret;
}
/**
* 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[i].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(context,
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;
int diff;
/* check if cert.issuer == crls.val[i].crl.issuer */
ret = _hx509_name_cmp(&c->tbsCertificate.issuer,
&crl->crl.tbsCertList.issuer, &diff);
if (ret || diff)
continue;
ret = stat(crl->path, &sb);
if (ret == 0 && crl->last_modfied != sb.st_mtime) {
CRLCertificateList cl;
ret = load_crl(context, 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_f(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(&asn1_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];
char *p;
if ((p = ctime(&t)) == NULL)
strlcpy(s, "?", sizeof(s));
else {
strlcpy(s, p + 4, sizeof(s));
s[20] = 0;
}
return s;
}
/*
*
*/
static int
print_ocsp(hx509_context context, struct revoke_ocsp *ocsp, FILE *out)
{
int ret = 0;
size_t i;
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%llu. status: %s\n", (unsigned long long)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_f(context, ocsp->certs, hx509_ci_print_names, out);
return ret;
}
static int
print_crl(hx509_context context, struct revoke_crl *crl, FILE *out)
{
{
hx509_name n;
char *s;
_hx509_name_from_Name(&crl->crl.tbsCertList.issuer, &n);
hx509_name_to_string(n, &s);
hx509_name_free(&n);
fprintf(out, " issuer: %s\n", s);
free(s);
}
fprintf(out, " thisUpdate: %s\n",
printable_time(_hx509_Time2time_t(&crl->crl.tbsCertList.thisUpdate)));
return 0;
}
/*
*
*/
int
hx509_revoke_print(hx509_context context,
hx509_revoke_ctx ctx,
FILE *out)
{
int saved_ret = 0, ret;
size_t n;
for (n = 0; n < ctx->ocsps.len; n++) {
struct revoke_ocsp *ocsp = &ctx->ocsps.val[n];
fprintf(out, "OCSP %s\n", ocsp->path);
ret = print_ocsp(context, ocsp, out);
if (ret) {
fprintf(out, "failure printing OCSP: %d\n", ret);
saved_ret = ret;
}
}
for (n = 0; n < ctx->crls.len; n++) {
struct revoke_crl *crl = &ctx->crls.val[n];
fprintf(out, "CRL %s\n", crl->path);
ret = print_crl(context, crl, out);
if (ret) {
fprintf(out, "failure printing CRL: %d\n", ret);
saved_ret = ret;
}
}
return saved_ret;
}
/**
* 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;
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;
}
ret = print_ocsp(context, &ocsp, 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;
size_t 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_f(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);
if (ret) {
hx509_set_error_string(context, 0, ret, "Failed to sign CRL");
goto out;
}
ASN1_MALLOC_ENCODE(CRLCertificateList, os->data, os->length,
&c, &size, ret);
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");
free_CRLCertificateList(&c);
return 0;
out:
free_CRLCertificateList(&c);
return ret;
}
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