--- /dev/null
+/*
+ * SecCAIssuerRequest.c
+ * Security
+ *
+ * Copyright (c) 2009-2014 Apple Inc.. All Rights Reserved.
+ *
+ */
+/*
+ * Copyright (c) 2009-2014 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/*
+ * SecCAIssuerRequest.c - asynchronous CAIssuer request fetching engine.
+ */
+
+
+#include "SecCAIssuerRequest.h"
+#include "SecCAIssuerCache.h"
+
+#include <Security/SecInternal.h>
+#include <CoreFoundation/CFURL.h>
+#include <CFNetwork/CFHTTPMessage.h>
+#include <utilities/debugging.h>
+#include <Security/SecCertificateInternal.h>
+#include <securityd/asynchttp.h>
+#include <stdlib.h>
+
+/* CA Issuer lookup code. */
+
+typedef struct SecCAIssuerRequest *SecCAIssuerRequestRef;
+struct SecCAIssuerRequest {
+ asynchttp_t http; /* Must be first field. */
+ SecCertificateRef certificate;
+ CFArrayRef issuers; /* NONRETAINED */
+ CFIndex issuerIX;
+ void *context;
+ void (*callback)(void *, CFArrayRef);
+};
+
+static void SecCAIssuerRequestRelease(SecCAIssuerRequestRef request) {
+ CFRelease(request->certificate);
+ asynchttp_free(&request->http);
+ free(request);
+}
+
+static bool SecCAIssuerRequestIssue(SecCAIssuerRequestRef request) {
+ while (request->issuerIX < CFArrayGetCount(request->issuers)) {
+ CFURLRef issuer = CFArrayGetValueAtIndex(request->issuers,
+ request->issuerIX++);
+ CFStringRef scheme = CFURLCopyScheme(issuer);
+ if (scheme) {
+ if (CFEqual(CFSTR("http"), scheme)) {
+ CFHTTPMessageRef msg = CFHTTPMessageCreateRequest(kCFAllocatorDefault,
+ CFSTR("GET"), issuer, kCFHTTPVersion1_1);
+ if (msg) {
+ secdebug("caissuer", "%@", msg);
+ bool done = asynchttp_request(msg, &request->http);
+ CFRelease(msg);
+ if (done == false) {
+ CFRelease(scheme);
+ return done;
+ }
+ }
+ secdebug("caissuer", "failed to get %@", issuer);
+ } else {
+ secdebug("caissuer", "skipping unsupported uri %@", issuer);
+ }
+ CFRelease(scheme);
+ }
+ }
+
+ /* No more issuers left to try, we're done. */
+ secdebug("caissuer", "no request issued");
+ request->callback(request->context, NULL);
+ SecCAIssuerRequestRelease(request);
+ return true;
+}
+
+/* Releases parent unconditionally, and return a CFArrayRef containing
+ parent if the normalized subject of parent matches the normalized issuer
+ of certificate. */
+static CFArrayRef SecCAIssuerConvertToParents(SecCertificateRef certificate,
+ SecCertificateRef parent) {
+ CFDataRef nic = SecCertificateGetNormalizedIssuerContent(certificate);
+ CFArrayRef parents = NULL;
+ if (parent) {
+ if (CFEqual(nic, SecCertificateGetNormalizedSubjectContent(parent))) {
+ const void *ventry = parent;
+ parents = CFArrayCreate(NULL, &ventry, 1, &kCFTypeArrayCallBacks);
+ }
+ CFRelease(parent);
+ }
+ return parents;
+}
+
+#define SECONDS_PER_DAY (86400.0)
+static void SecCAIssuerRequestCompleted(asynchttp_t *http,
+ CFTimeInterval maxAge) {
+ /* Cast depends on http being first field in struct SecCAIssuerRequest. */
+ SecCAIssuerRequestRef request = (SecCAIssuerRequestRef)http;
+ CFDataRef data = (request->http.response ?
+ CFHTTPMessageCopyBody(request->http.response) : NULL);
+ if (data) {
+ SecCertificateRef parent = SecCertificateCreateWithData(NULL, data);
+ CFRelease(data);
+ if (parent) {
+ /* We keep responses in the cache for at least 7 days, or longer
+ if the http response tells us to keep it around for more. */
+ if (maxAge < SECONDS_PER_DAY * 7)
+ maxAge = SECONDS_PER_DAY * 7;
+ CFAbsoluteTime expires = CFAbsoluteTimeGetCurrent() + maxAge;
+ CFURLRef issuer = CFArrayGetValueAtIndex(request->issuers,
+ request->issuerIX - 1);
+ SecCAIssuerCacheAddCertificate(parent, issuer, expires);
+ CFArrayRef parents = SecCAIssuerConvertToParents(
+ request->certificate, parent);
+ if (parents) {
+ secdebug("caissuer", "response: %@ good", http->response);
+ request->callback(request->context, parents);
+ CFRelease(parents);
+ SecCAIssuerRequestRelease(request);
+ return;
+ }
+ }
+ }
+
+ secdebug("caissuer", "response: %@ not parent, trying next caissuer",
+ http->response);
+ SecCAIssuerRequestIssue(request);
+}
+
+static CFArrayRef SecCAIssuerRequestCacheCopyParents(SecCertificateRef cert,
+ CFArrayRef issuers) {
+ CFIndex ix = 0, ex = CFArrayGetCount(issuers);
+ for (;ix < ex; ++ix) {
+ CFURLRef issuer = CFArrayGetValueAtIndex(issuers, ix);
+ CFStringRef scheme = CFURLCopyScheme(issuer);
+ if (scheme) {
+ if (CFEqual(CFSTR("http"), scheme)) {
+ CFArrayRef parents = SecCAIssuerConvertToParents(cert,
+ SecCAIssuerCacheCopyMatching(issuer));
+ if (parents) {
+ secdebug("caissuer", "cache hit, for %@ no request issued", issuer);
+ CFRelease(scheme);
+ return parents;
+ }
+ }
+ CFRelease(scheme);
+ }
+ }
+ return NULL;
+}
+
+bool SecCAIssuerCopyParents(SecCertificateRef certificate, dispatch_queue_t queue,
+ void *context, void (*callback)(void *, CFArrayRef)) {
+ CFArrayRef issuers = SecCertificateGetCAIssuers(certificate);
+ if (!issuers) {
+ /* certificate has no caissuer urls, we're done. */
+ callback(context, NULL);
+ return true;
+ }
+
+ CFArrayRef parents = SecCAIssuerRequestCacheCopyParents(certificate, issuers);
+ if (parents) {
+ callback(context, parents);
+ CFReleaseSafe(parents);
+ return true;
+ }
+
+ /* Cache miss, let's issue a network request. */
+ SecCAIssuerRequestRef request =
+ (SecCAIssuerRequestRef)calloc(1, sizeof(*request));
+ request->http.queue = queue;
+ request->http.completed = SecCAIssuerRequestCompleted;
+ CFRetain(certificate);
+ request->certificate = certificate;
+ request->issuers = issuers;
+ request->issuerIX = 0;
+ request->context = context;
+ request->callback = callback;
+
+ return SecCAIssuerRequestIssue(request);
+}
+
projects / apple / security.git / blobdiff