--- /dev/null
+//
+// SOSPeerInfo.c
+// sec
+//
+// Created by Mitch Adler on 7/19/12.
+//
+//
+
+#include <AssertMacros.h>
+#include <TargetConditionals.h>
+
+#include <SecureObjectSync/SOSPeerInfo.h>
+#include <SecureObjectSync/SOSPeerInfoInternal.h>
+#include <SecureObjectSync/SOSCircle.h>
+
+#include <SecureObjectSync/SOSInternal.h>
+#include <ipc/securityd_client.h>
+
+#include "Imported/SecuritydXPC.h"
+
+#include <CoreFoundation/CFArray.h>
+#include <dispatch/dispatch.h>
+
+#include <stdlib.h>
+#include <assert.h>
+
+#include <utilities/SecCFWrappers.h>
+#include <utilities/SecCFRelease.h>
+#include <utilities/SecCFError.h>
+#include <utilities/SecXPCError.h>
+
+#include <utilities/der_plist.h>
+#include <utilities/der_plist_internal.h>
+#include <corecrypto/ccder.h>
+#include <utilities/der_date.h>
+
+#include <corecrypto/ccdigest.h>
+#include <corecrypto/ccsha2.h>
+
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <CoreFoundation/CFDate.h>
+
+#include <xpc/xpc.h>
+
+#if TARGET_OS_IPHONE || TARGET_OS_EMBEDDED
+#include <MobileGestalt.h>
+#endif
+
+#include <Security/SecBase64.h>
+#include <Security/SecKeyPriv.h>
+#include <Security/SecOTR.h>
+
+#if 0//TARGET_OS_MAC // TODO: this function is the only one that causes secd to need to link against Security.framework on OSX
+
+__BEGIN_DECLS
+SecKeyRef _SecKeyCreateFromPublicData(CFAllocatorRef allocator, CFIndex algorithmID, CFDataRef publicBytes);
+__END_DECLS
+
+#endif /* TARGET_OS_MAC */
+
+struct __OpaqueSOSPeerInfo {
+ CFRuntimeBase _base;
+
+ //
+ CFMutableDictionaryRef description;
+ CFDataRef signature;
+
+ // Cached data
+ CFDictionaryRef gestalt;
+ CFStringRef id;
+ CFIndex version;
+};
+
+CFGiblisWithHashFor(SOSPeerInfo);
+
+CFStringRef kPIUserDefinedDeviceName = CFSTR("ComputerName");
+CFStringRef kPIDeviceModelName = CFSTR("ModelName");
+
+// Description Dictionary Entries
+static CFStringRef sPublicKeyKey = CFSTR("PublicSigningKey");
+static CFStringRef sGestaltKey = CFSTR("DeviceGestalt");
+static CFStringRef sVersionKey = CFSTR("ConflictVersion");
+static CFStringRef sCloudIdentityKey = CFSTR("CloudIdentity");
+static CFStringRef sApplicationDate = CFSTR("ApplicationDate");
+static CFStringRef sApplicationUsig = CFSTR("ApplicationUsig");
+static CFStringRef sRetirementDate = CFSTR("RetirementDate");
+
+// Peerinfo Entries
+CFStringRef kSOSPeerInfoDescriptionKey = CFSTR("SOSPeerInfoDescription");
+CFStringRef kSOSPeerInfoSignatureKey = CFSTR("SOSPeerInfoSignature");
+CFStringRef kSOSPeerInfoNameKey = CFSTR("SOSPeerInfoName");
+
+
+SecKeyRef SOSPeerInfoCopyPubKey(SOSPeerInfoRef peer) {
+ CFDataRef pubKeyBytes = CFDictionaryGetValue(peer->description, sPublicKeyKey);
+ CFAllocatorRef allocator = CFGetAllocator(peer);
+ SecKeyRef pubKey = SecKeyCreateFromPublicData(allocator, kSecECDSAAlgorithmID, pubKeyBytes);
+ return pubKey;
+}
+
+
+static bool SOSDescriptionHash(SOSPeerInfoRef peer, const struct ccdigest_info *di, void *hashresult, CFErrorRef *error) {
+ ccdigest_di_decl(di, ctx);
+ ccdigest_init(di, ctx);
+ void *ctx_p = ctx;
+ if(!SOSPeerInfoUpdateDigestWithDescription(peer, di, ctx_p, error)) return false;
+ ccdigest_final(di, ctx, hashresult);
+ return true;
+}
+
+
+#define SIGLEN 128
+static CFDataRef sosSignHash(SecKeyRef privkey, const struct ccdigest_info *di, uint8_t *hbuf) {
+ OSStatus stat;
+ size_t siglen = SIGLEN;
+ uint8_t sig[siglen];
+ if((stat = SecKeyRawSign(privkey, kSecPaddingNone, hbuf, di->output_size, sig, &siglen)) != 0) {
+ return NULL;
+ }
+ return CFDataCreate(NULL, sig, (CFIndex)siglen);
+}
+
+static bool sosVerifyHash(SecKeyRef pubkey, const struct ccdigest_info *di, uint8_t *hbuf, CFDataRef signature) {
+ return SecKeyRawVerify(pubkey, kSecPaddingNone, hbuf, di->output_size,
+ CFDataGetBytePtr(signature), CFDataGetLength(signature)) == errSecSuccess;
+}
+
+static bool SOSPeerInfoSign(SecKeyRef privKey, SOSPeerInfoRef peer, CFErrorRef *error) {
+ bool status = false;
+ const struct ccdigest_info *di = ccsha256_di();
+ uint8_t hbuf[di->output_size];
+ CFDataRef newSignature = NULL;
+
+ require_action_quiet(SOSDescriptionHash(peer, di, hbuf, error), fail,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to hash description for peer"), NULL, error));
+
+ newSignature = sosSignHash(privKey, di, hbuf);
+ require_action_quiet(newSignature, fail, SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to sign peerinfo for peer"), NULL, error));
+
+ CFReleaseNull(peer->signature);
+ peer->signature = newSignature;
+ newSignature = NULL;
+ status = true;
+
+fail:
+ CFReleaseNull(newSignature);
+ return status;
+}
+
+// Return true (1) if the signature verifies.
+static bool SOSPeerInfoVerify(SOSPeerInfoRef peer, CFErrorRef *error) {
+ bool result = false;
+ const struct ccdigest_info *di = ccsha256_di();
+ uint8_t hbuf[di->output_size];
+
+ SecKeyRef pubKey = SOSPeerInfoCopyPubKey(peer);
+ require_quiet(pubKey, error_out);
+
+ require_quiet(SOSDescriptionHash(peer, di, hbuf, error), error_out);
+
+ result = sosVerifyHash(pubKey, di, hbuf, peer->signature);
+
+error_out:
+ CFReleaseNull(pubKey);
+ return result;
+}
+
+static SOSPeerInfoRef SOSPeerInfoCreate_Internal(CFAllocatorRef allocator, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error, void (^ description_modifier)(CFMutableDictionaryRef description)) {
+ SOSPeerInfoRef pi = CFTypeAllocate(SOSPeerInfo, struct __OpaqueSOSPeerInfo, allocator);
+ pi->gestalt = gestalt;
+ CFRetain(pi->gestalt);
+
+ pi->version = kSOSPeerVersion;
+
+ CFDataRef publicBytes = NULL;
+ CFNumberRef versionNumber = NULL;
+
+ SecKeyRef publicKey = SecKeyCreatePublicFromPrivate(signingKey);
+ if (publicKey == NULL) {
+ SOSCreateError(kSOSErrorBadKey, CFSTR("Unable to get public"), NULL, error);
+ CFReleaseNull(pi);
+ goto exit;
+ }
+
+ OSStatus result = SecKeyCopyPublicBytes(publicKey, &publicBytes);
+
+ if (result != errSecSuccess) {
+ SOSCreateError(kSOSErrorBadKey, CFSTR("Failed to export public bytes"), NULL, error);
+ CFReleaseNull(pi);
+ goto exit;
+ }
+
+ pi->signature = CFDataCreateMutable(allocator, 0);
+
+ versionNumber = CFNumberCreateWithCFIndex(NULL, pi->version);
+ pi->description = CFDictionaryCreateMutableForCFTypesWith(allocator,
+ sVersionKey, versionNumber,
+ sPublicKeyKey, publicBytes,
+ sGestaltKey, pi->gestalt,
+ NULL);
+ description_modifier(pi->description);
+
+ pi->id = SOSCopyIDOfKey(publicKey, error);
+ CFReleaseNull(publicKey);
+
+ require_quiet(pi->id, exit);
+
+ if (!SOSPeerInfoSign(signingKey, pi, error)) {
+ CFReleaseNull(pi);
+ goto exit;
+ }
+
+exit:
+ CFReleaseNull(versionNumber);
+ CFReleaseNull(publicBytes);
+ return pi;
+}
+
+SOSPeerInfoRef SOSPeerInfoCreate(CFAllocatorRef allocator, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error) {
+ return SOSPeerInfoCreate_Internal(allocator, gestalt, signingKey, error, ^(CFMutableDictionaryRef description) {});
+}
+
+SOSPeerInfoRef SOSPeerInfoCreateCloudIdentity(CFAllocatorRef allocator, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error) {
+ return SOSPeerInfoCreate_Internal(allocator, gestalt, signingKey, error, ^(CFMutableDictionaryRef description) {
+ CFDictionarySetValue(description, sCloudIdentityKey, kCFBooleanTrue);
+ });
+
+}
+
+
+SOSPeerInfoRef SOSPeerInfoCreateCopy(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFErrorRef* error) {
+ SOSPeerInfoRef pi = CFTypeAllocate(SOSPeerInfo, struct __OpaqueSOSPeerInfo, allocator);
+
+ pi->description = CFDictionaryCreateMutableCopy(allocator, 0, toCopy->description);
+ pi->signature = CFDataCreateCopy(allocator, toCopy->signature);
+
+ pi->gestalt = CFDictionaryCreateCopy(allocator, toCopy->gestalt);
+ pi->id = CFStringCreateCopy(allocator, toCopy->id);
+
+ pi->version = toCopy->version;
+
+ return pi;
+}
+
+SOSPeerInfoRef SOSPeerInfoCopyWithGestaltUpdate(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error) {
+ SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
+
+ CFRetainSafe(gestalt);
+ CFReleaseNull(pi->gestalt);
+ pi->gestalt = gestalt;
+
+ CFDictionarySetValue(pi->description, sGestaltKey, pi->gestalt);
+
+ SecKeyRef pub_key = SOSPeerInfoCopyPubKey(pi);
+
+ pi->id = SOSCopyIDOfKey(pub_key, error);
+ require_quiet(pi->id, exit);
+
+ require_action_quiet(SOSPeerInfoSign(signingKey, pi, error), exit, CFReleaseNull(pi));
+
+exit:
+ CFReleaseNull(pub_key);
+ return pi;
+}
+
+SOSPeerInfoRef SOSPeerInfoCreateFromDER(CFAllocatorRef allocator, CFErrorRef* error,
+ const uint8_t** der_p, const uint8_t *der_end) {
+ SOSPeerInfoRef pi = CFTypeAllocate(SOSPeerInfo, struct __OpaqueSOSPeerInfo, allocator);
+ SecKeyRef pubKey = NULL;
+
+ const uint8_t *sequence_end;
+
+ CFPropertyListRef pl = NULL;
+
+ pi->gestalt = NULL;
+ pi->version = 0; // TODO: Encode this in the DER
+
+ *der_p = ccder_decode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, &sequence_end, *der_p, der_end);
+ *der_p = der_decode_plist(allocator, kCFPropertyListImmutable, &pl, error, *der_p, sequence_end);
+ *der_p = der_decode_data(allocator, kCFPropertyListImmutable, &pi->signature, error, *der_p, sequence_end);
+
+ if (*der_p == NULL || *der_p != sequence_end) {
+ SOSCreateError(kSOSErrorBadFormat, CFSTR("Bad Format of Peer Info DER"), NULL, error);
+ goto fail;
+ }
+
+ if (CFGetTypeID(pl) != CFDictionaryGetTypeID()) {
+ CFStringRef description = CFCopyTypeIDDescription(CFGetTypeID(pl));
+ SOSCreateErrorWithFormat(kSOSErrorUnexpectedType, NULL, error, NULL,
+ CFSTR("Expected dictionary got %@"), description);
+ CFReleaseSafe(description);
+ goto fail;
+ }
+
+ pi->description = (CFMutableDictionaryRef) pl;
+ CFRetain(pi->description);
+ CFReleaseNull(pl);
+
+ CFNumberRef versionNumber = CFDictionaryGetValue(pi->description, sVersionKey);
+
+ if (versionNumber) {
+ CFNumberGetValue(versionNumber, kCFNumberCFIndexType, &pi->version);
+ }
+
+ CFDictionaryRef gestalt = CFDictionaryGetValue(pi->description, sGestaltKey);
+
+ if (!isDictionary(gestalt)) {
+ CFStringRef description = CFCopyTypeIDDescription(CFGetTypeID(pl));
+ SOSCreateErrorWithFormat(kSOSErrorUnexpectedType, NULL, error, NULL,
+ CFSTR("Expected dictionary got %@"), description);
+ CFReleaseSafe(description);
+ goto fail;
+ }
+
+ pi->gestalt = gestalt;
+ CFRetain(pi->gestalt);
+
+ pubKey = SOSPeerInfoCopyPubKey(pi);
+ require_quiet(pubKey, fail);
+
+ pi->id = SOSCopyIDOfKey(pubKey, error);
+ require_quiet(pi->id, fail);
+
+ if(!SOSPeerInfoVerify(pi, error)) {
+ SOSCreateErrorWithFormat(kSOSErrorBadSignature, NULL, error, NULL, CFSTR("Signature doesn't validate"));
+ if (error)
+ secerror("Can't validate PeerInfo: %@", *error);
+ goto fail;
+ }
+ CFReleaseNull(pubKey);
+ return pi;
+
+fail:
+ CFReleaseNull(pi);
+ CFReleaseNull(pl);
+ CFReleaseNull(pubKey);
+
+ return NULL;
+}
+
+SOSPeerInfoRef SOSPeerInfoCreateFromData(CFAllocatorRef allocator, CFErrorRef* error,
+ CFDataRef peerinfo_data) {
+ const uint8_t *der = CFDataGetBytePtr(peerinfo_data);
+ CFIndex len = CFDataGetLength(peerinfo_data);
+ return SOSPeerInfoCreateFromDER(NULL, error, &der, der+len);
+}
+
+static void SOSPeerInfoDestroy(CFTypeRef aObj) {
+ SOSPeerInfoRef pi = (SOSPeerInfoRef) aObj;
+
+ if(!pi) return;
+ CFReleaseNull(pi->description);
+ CFReleaseNull(pi->signature);
+ CFReleaseNull(pi->gestalt);
+ CFReleaseNull(pi->id);
+}
+
+static Boolean SOSPeerInfoCompare(CFTypeRef lhs, CFTypeRef rhs) {
+ SOSPeerInfoRef lpeer = (SOSPeerInfoRef) lhs;
+ SOSPeerInfoRef rpeer = (SOSPeerInfoRef) rhs;
+ if(!lpeer || !rpeer) return false;
+ return CFEqualSafe(lpeer->description, rpeer->description) && CFEqualSafe(lpeer->signature, rpeer->signature);
+}
+
+
+CFComparisonResult SOSPeerInfoCompareByID(const void *val1, const void *val2, void *context) {
+ CFStringRef v1 = SOSPeerInfoGetPeerID((SOSPeerInfoRef) val1);
+ CFStringRef v2 = SOSPeerInfoGetPeerID((SOSPeerInfoRef) val2);
+ return CFStringCompare(v1, v2, 0);
+}
+
+static CFHashCode SOSPeerInfoHash(CFTypeRef cf) {
+ SOSPeerInfoRef peer = (SOSPeerInfoRef) cf;
+
+ return CFHash(peer->description) ^ CFHash(peer->signature);
+}
+
+static CFStringRef SOSPeerInfoCopyDescription(CFTypeRef aObj) {
+ SOSPeerInfoRef pi = (SOSPeerInfoRef) aObj;
+
+ return CFStringCreateWithFormat(NULL, NULL, CFSTR("<SOSPeerInfo@%p: Name:'%@'%s Type: '%@' ID:'%@'>"),
+ pi,
+ CFDictionaryGetValue(pi->gestalt, kPIUserDefinedDeviceName),
+ SOSPeerInfoIsRetirementTicket(pi) ? " [retired]" : "",
+ CFDictionaryGetValue(pi->gestalt, kPIDeviceModelName),
+ pi->id);
+}
+
+CFDictionaryRef SOSPeerInfoCopyPeerGestalt(SOSPeerInfoRef pi) {
+ CFRetain(pi->gestalt);
+ return pi->gestalt;
+}
+
+CFStringRef SOSPeerInfoGetPeerName(SOSPeerInfoRef peer) {
+ return SOSPeerInfoLookupGestaltValue(peer, kPIUserDefinedDeviceName);
+}
+
+CFStringRef SOSPeerInfoGetPeerDeviceType(SOSPeerInfoRef peer) {
+ return SOSPeerInfoLookupGestaltValue(peer, kPIDeviceModelName);
+}
+
+CFTypeRef SOSPeerInfoLookupGestaltValue(SOSPeerInfoRef pi, CFStringRef key) {
+ return CFDictionaryGetValue(pi->gestalt, key);
+}
+
+CFStringRef SOSPeerInfoGetPeerID(SOSPeerInfoRef pi) {
+ return pi->id;
+}
+
+CFIndex SOSPeerInfoGetVersion(SOSPeerInfoRef pi) {
+ // TODO: Encode this in the DER.
+ return pi->version;
+}
+
+bool SOSPeerInfoUpdateDigestWithPublicKeyBytes(SOSPeerInfoRef peer, const struct ccdigest_info *di,
+ ccdigest_ctx_t ctx, CFErrorRef *error) {
+ CFDataRef pubKeyBytes = CFDictionaryGetValue(peer->description, sPublicKeyKey);
+
+ if(!pubKeyBytes) {
+ SOSCreateErrorWithFormat(kSOSErrorEncodeFailure, NULL, error, NULL, CFSTR("Digest failed – no public key"));
+ return false;
+ }
+
+ ccdigest_update(di, ctx, CFDataGetLength(pubKeyBytes), CFDataGetBytePtr(pubKeyBytes));
+
+ return true;
+}
+
+bool SOSPeerInfoUpdateDigestWithDescription(SOSPeerInfoRef peer, const struct ccdigest_info *di,
+ ccdigest_ctx_t ctx, CFErrorRef *error) {
+ size_t description_size = der_sizeof_plist(peer->description, error);
+ uint8_t data_begin[description_size];
+ uint8_t *data_end = data_begin + description_size;
+ uint8_t *encoded = der_encode_plist(peer->description, error, data_begin, data_end);
+
+ if(!encoded) {
+ SOSCreateErrorWithFormat(kSOSErrorEncodeFailure, NULL, error, NULL, CFSTR("Description encode failed"));
+ return false;
+ }
+
+ ccdigest_update(di, ctx, description_size, data_begin);
+
+ return true;
+}
+
+
+static CFDataRef sosCreateDate() {
+ CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
+ size_t bufsiz = der_sizeof_date(now, NULL);
+ uint8_t buf[bufsiz];
+ der_encode_date(now, NULL, buf, buf+bufsiz);
+ CFReleaseNull(now);
+ return CFDataCreate(NULL, buf, bufsiz);
+}
+
+static CFDateRef sosCreateCFDate(CFDataRef sosdate) {
+ CFDateRef date;
+ der_decode_date(NULL, 0, &date, NULL, CFDataGetBytePtr(sosdate),
+ CFDataGetBytePtr(sosdate) + CFDataGetLength(sosdate));
+ return date;
+}
+
+static bool sospeer_application_hash(SOSPeerInfoRef pi, const struct ccdigest_info *di, uint8_t *hbuf) {
+ CFDataRef appdate = CFDictionaryGetValue(pi->description, sApplicationDate);
+ if(!appdate) return false;
+ ccdigest_di_decl(di, ctx);
+ ccdigest_init(di, ctx);
+ ccdigest_update(di, ctx, CFDataGetLength(appdate), CFDataGetBytePtr(appdate));
+ if (!SOSPeerInfoUpdateDigestWithPublicKeyBytes(pi, di, ctx, NULL)) return false;
+ ccdigest_final(di, ctx, hbuf);
+ return true;
+}
+
+SOSPeerInfoRef SOSPeerInfoCopyAsApplication(SOSPeerInfoRef original, SecKeyRef userkey, SecKeyRef peerkey, CFErrorRef *error) {
+ SOSPeerInfoRef result = NULL;
+ SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(kCFAllocatorDefault, original, error);
+
+ const struct ccdigest_info *di = ccsha256_di();
+ uint8_t hbuf[di->output_size];
+ CFDataRef usersig = NULL;
+
+ CFDataRef creationDate = sosCreateDate();
+ CFDictionarySetValue(pi->description, sApplicationDate, creationDate);
+ CFReleaseNull(creationDate);
+
+ // Create User Application Signature
+ require_action_quiet(sospeer_application_hash(pi, di, hbuf), fail,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to create hash for peer applicant"), NULL, error));
+
+ usersig = sosSignHash(userkey, di, hbuf);
+ require_action_quiet(usersig, fail,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to sign public key hash for peer"), NULL, error));
+
+ CFDictionarySetValue(pi->description, sApplicationUsig, usersig);
+
+ require_quiet(SOSPeerInfoSign(peerkey, pi, error), fail);
+
+ result = pi;
+ pi = NULL;
+
+fail:
+ CFReleaseNull(usersig);
+ CFReleaseNull(pi);
+ return result;
+}
+
+bool SOSPeerInfoApplicationVerify(SOSPeerInfoRef pi, SecKeyRef userkey, CFErrorRef *error) {
+ const struct ccdigest_info *di = ccsha256_di();
+ uint8_t hbuf[di->output_size];
+ bool result = false;
+
+ CFDataRef usig = CFDictionaryGetValue(pi->description, sApplicationUsig);
+ require_action_quiet(usig, exit,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Peer is not an applicant"), NULL, error));
+ // Verify User Application Signature
+ require_action_quiet(sospeer_application_hash(pi, di, hbuf), exit,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to create hash for peer applicant"), NULL, error));
+ require_action_quiet(sosVerifyHash(userkey, di, hbuf, usig), exit,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("user signature of public key hash fails to verify"), NULL, error));
+
+ result = SOSPeerInfoVerify(pi, error);
+
+exit:
+ return result;
+}
+
+
+static CF_RETURNS_RETAINED CFDateRef sosPeerInfoGetDate(SOSPeerInfoRef pi, CFStringRef entry) {
+ if(!pi) return NULL;
+ CFDataRef sosdate = CFDictionaryGetValue(pi->description, entry);
+ if(!sosdate) return NULL;
+ CFDateRef date = sosCreateCFDate(sosdate);
+
+ return date;
+}
+
+CF_RETURNS_RETAINED CFDateRef SOSPeerInfoGetApplicationDate(SOSPeerInfoRef pi) {
+ return sosPeerInfoGetDate(pi, sApplicationDate);
+}
+
+CF_RETURNS_RETAINED CFDateRef SOSPeerInfoGetRetirementDate(SOSPeerInfoRef pi) {
+ return sosPeerInfoGetDate(pi, sRetirementDate);
+}
+
+
+size_t SOSPeerInfoGetDEREncodedSize(SOSPeerInfoRef peer, CFErrorRef *error) {
+ size_t plist_size = der_sizeof_plist(peer->description, error);
+ if (plist_size == 0)
+ return 0;
+
+ size_t signature_size = der_sizeof_data(peer->signature, error);
+ if (signature_size == 0)
+ return 0;
+
+ return ccder_sizeof(CCDER_CONSTRUCTED_SEQUENCE,
+ plist_size + signature_size);
+}
+
+uint8_t* SOSPeerInfoEncodeToDER(SOSPeerInfoRef peer, CFErrorRef* error, const uint8_t* der, uint8_t* der_end) {
+ return ccder_encode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, der_end, der,
+ der_encode_plist(peer->description, error, der,
+ der_encode_data(peer->signature, error, der, der_end)));
+}
+
+CFDataRef SOSPeerInfoCopyEncodedData(SOSPeerInfoRef peer, CFAllocatorRef allocator, CFErrorRef *error) {
+ size_t size = SOSPeerInfoGetDEREncodedSize(peer, error);
+ if (size == 0) return NULL;
+
+ uint8_t buffer[size];
+ uint8_t* start = SOSPeerInfoEncodeToDER(peer, error, buffer, buffer + sizeof(buffer));
+ CFDataRef result = CFDataCreate(kCFAllocatorDefault, start, size);
+ return result;
+}
+
+
+//
+// PeerInfoArray encoding decoding
+//
+
+CFMutableArrayRef SOSPeerInfoArrayCreateFromDER(CFAllocatorRef allocator, CFErrorRef* error,
+ const uint8_t** der_p, const uint8_t *der_end) {
+ CFMutableArrayRef pia = CFArrayCreateMutableForCFTypes(allocator);
+
+ const uint8_t *sequence_end;
+
+ *der_p = ccder_decode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, &sequence_end, *der_p, der_end);
+
+ require_action(*der_p, fail, SOSCreateError(kSOSErrorBadFormat, CFSTR("Bad Peer Info Array Sequence Header"), NULL, error));
+
+ while (sequence_end != *der_p) {
+ SOSPeerInfoRef pi = SOSPeerInfoCreateFromDER(allocator, error, der_p, sequence_end);
+
+ if (pi == NULL || *der_p == NULL) {
+ SOSCreateError(kSOSErrorBadFormat, CFSTR("Bad Peer Info Array DER"), (error != NULL ? *error : NULL), error);
+ CFReleaseNull(pi);
+ goto fail;
+ }
+
+ CFArrayAppendValue(pia, pi);
+ CFReleaseSafe(pi);
+ }
+
+ if (!pia)
+ *der_p = NULL;
+ return pia;
+
+fail:
+ CFReleaseNull(pia);
+ *der_p = NULL;
+ return NULL;
+}
+
+size_t SOSPeerInfoArrayGetDEREncodedSize(CFArrayRef pia, CFErrorRef *error) {
+ size_t array_size = 0;
+
+ for(CFIndex count = CFArrayGetCount(pia);
+ count > 0;
+ --count) {
+ SOSPeerInfoRef pi = (SOSPeerInfoRef) CFArrayGetValueAtIndex(pia, count - 1);
+
+ if (CFGetTypeID(pi) != SOSPeerInfoGetTypeID()) {
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Non SOSPeerInfo in array"), (error != NULL ? *error : NULL), error);
+ return 0;
+ }
+
+ size_t pi_size = SOSPeerInfoGetDEREncodedSize(pi, error);
+
+ if (pi_size == 0) {
+ SOSCreateError(kSOSErrorEncodeFailure, CFSTR("Bad DER size"), (error != NULL ? *error : NULL), error);
+ return 0;
+ }
+
+ array_size += pi_size;
+ }
+
+
+ return ccder_sizeof(CCDER_CONSTRUCTED_SEQUENCE,
+ array_size);
+}
+
+uint8_t* SOSPeerInfoArrayEncodeToDER(CFArrayRef pia, CFErrorRef* error, const uint8_t* der, uint8_t* der_end_param) {
+
+ uint8_t* const sequence_end = der_end_param;
+ __block uint8_t* der_end = der_end_param;
+
+ CFArrayForEachReverse(pia, ^(const void *value) {
+ SOSPeerInfoRef pi = (SOSPeerInfoRef) value;
+ if (CFGetTypeID(pi) != SOSPeerInfoGetTypeID()) {
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Non SOSPeerInfo in array"), NULL, error);
+ der_end = NULL; // Indicate error and continue.
+ }
+ if (der_end)
+ der_end = SOSPeerInfoEncodeToDER(pi, error, der, der_end);
+ });
+
+ if (der_end == NULL)
+ return NULL;
+
+ return ccder_encode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, sequence_end, der, der_end);
+}
+
+
+CFArrayRef CreateArrayOfPeerInfoWithXPCObject(xpc_object_t peerArray, CFErrorRef* error) {
+ if (!peerArray) {
+ SecCFCreateErrorWithFormat(kSecXPCErrorUnexpectedNull, sSecXPCErrorDomain, NULL, error, NULL, CFSTR("Unexpected Null Array to encode"));
+ return NULL;
+ }
+
+ if (xpc_get_type(peerArray) != XPC_TYPE_DATA) {
+ SecCFCreateErrorWithFormat(kSecXPCErrorUnexpectedType, sSecXPCErrorDomain, NULL, error, NULL, CFSTR("Array of peer info not array, got %@"), peerArray);
+ return NULL;
+ }
+
+ const uint8_t* der = xpc_data_get_bytes_ptr(peerArray);
+ const uint8_t* der_end = der + xpc_data_get_length(peerArray);
+
+ return SOSPeerInfoArrayCreateFromDER(kCFAllocatorDefault, error, &der, der_end);
+}
+
+xpc_object_t CreateXPCObjectWithArrayOfPeerInfo(CFArrayRef array, CFErrorRef *error) {
+ size_t data_size = SOSPeerInfoArrayGetDEREncodedSize(array, error);
+ if (data_size == 0)
+ return NULL;
+ uint8_t *data = (uint8_t *)malloc(data_size);
+ if (!data) return NULL;
+
+ xpc_object_t result = NULL;
+ if (SOSPeerInfoArrayEncodeToDER(array, error, data, data + data_size))
+ result = xpc_data_create(data, data_size);
+
+ free(data);
+ return result;
+}
+
+//
+// Gestalt helpers
+//
+
+CFStringRef SOSPeerGestaltGetName(CFDictionaryRef gestalt) {
+ CFStringRef name = SOSPeerGestaltGetAnswer(gestalt, kPIUserDefinedDeviceName);
+ return isString(name) ? name : NULL;
+}
+
+CFTypeRef SOSPeerGestaltGetAnswer(CFDictionaryRef gestalt, CFStringRef question) {
+ return gestalt ? CFDictionaryGetValue(gestalt, question) : NULL;
+}
+
+//
+// Peer Retirement
+//
+
+
+SOSPeerInfoRef SOSPeerInfoCreateRetirementTicket(CFAllocatorRef allocator, SecKeyRef privKey, SOSPeerInfoRef peer, CFErrorRef *error) {
+ // Copy PeerInfo
+ SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, peer, error);
+
+ require(pi, fail);
+
+ // Fill out Resignation Date
+ CFDataRef resignationDate = sosCreateDate();
+ CFDictionaryAddValue(pi->description, sRetirementDate, resignationDate);
+ CFReleaseNull(resignationDate);
+
+ require(SOSPeerInfoSign(privKey, pi, error), fail);
+
+ return pi;
+
+fail:
+ CFReleaseNull(pi);
+ return NULL;
+}
+
+CFStringRef SOSPeerInfoInspectRetirementTicket(SOSPeerInfoRef pi, CFErrorRef *error) {
+ CFStringRef retval = NULL;
+ CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
+ CFDateRef retirement = NULL;
+
+ require_quiet(SOSPeerInfoVerify(pi, error), err);
+
+ retirement = sosCreateCFDate(CFDictionaryGetValue(pi->description, sRetirementDate));
+
+ require_action_quiet(retirement, err,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Peer is not retired"), NULL, error));
+
+ require_action_quiet(CFDateCompare(now, retirement, NULL) == kCFCompareGreaterThan, err,
+ SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Retirement date is after current date"), NULL, error));
+
+ retval = SOSPeerInfoGetPeerID(pi);
+
+err:
+ CFReleaseNull(now);
+ CFReleaseNull(retirement);
+ return retval;
+}
+
+bool SOSPeerInfoRetireRetirementTicket(size_t max_seconds, SOSPeerInfoRef pi) {
+ CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
+ CFDateRef retirement = sosCreateCFDate(CFDictionaryGetValue(pi->description, sRetirementDate));
+ CFTimeInterval timediff = CFDateGetTimeIntervalSinceDate(now, retirement); // diff in seconds
+ CFReleaseNull(now);
+ CFReleaseNull(retirement);
+ if(timediff > (max_seconds)) return true;
+ return false;
+}
+
+bool SOSPeerInfoIsRetirementTicket(SOSPeerInfoRef pi) {
+ CFDataRef flag = CFDictionaryGetValue(pi->description, sRetirementDate);
+ return flag != NULL;
+}
+
+bool SOSPeerInfoIsCloudIdentity(SOSPeerInfoRef pi) {
+ CFTypeRef value = CFDictionaryGetValue(pi->description, sCloudIdentityKey);
+ return CFEqualSafe(value, kCFBooleanTrue);
+}
+
+SOSPeerInfoRef SOSPeerInfoUpgradeSignatures(CFAllocatorRef allocator, SecKeyRef privKey, SecKeyRef peerKey, SOSPeerInfoRef peer, CFErrorRef *error) {
+ SecKeyRef pubKey = SecKeyCreatePublicFromPrivate(privKey);
+ SOSPeerInfoRef retval = NULL;
+
+ retval = SOSPeerInfoCopyAsApplication(peer, privKey, peerKey, error);
+ CFReleaseNull(pubKey);
+ return retval;
+}
+
projects / apple / security.git / blobdiff