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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#import "GRPCSecureChannelFactory.h"
#include <grpc/grpc_security.h>
#import "ChannelArgsUtil.h"
#import "GRPCChannel.h"
#import "utilities.h"
NS_ASSUME_NONNULL_BEGIN
@implementation GRPCSecureChannelFactory {
grpc_channel_credentials *_channelCreds;
}
+ (instancetype _Nullable)factoryWithPEMRootCertificates:(NSString *_Nullable)rootCerts
privateKey:(NSString *_Nullable)privateKey
certChain:(NSString *_Nullable)certChain
error:(NSError **)errorPtr {
return [[self alloc] initWithPEMRootCerts:rootCerts
privateKey:privateKey
certChain:certChain
error:errorPtr];
}
- (NSData *_Nullable)nullTerminatedDataWithString:(NSString *_Nullable)string {
// dataUsingEncoding: does not return a null-terminated string.
NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
if (data == nil) {
return nil;
}
NSMutableData *nullTerminated = [NSMutableData dataWithData:data];
[nullTerminated appendBytes:"\0" length:1];
return nullTerminated;
}
- (instancetype _Nullable)initWithPEMRootCerts:(NSString *_Nullable)rootCerts
privateKey:(NSString *_Nullable)privateKey
certChain:(NSString *_Nullable)certChain
error:(NSError **)errorPtr {
static NSData *defaultRootsASCII;
static NSError *defaultRootsError;
static dispatch_once_t loading;
dispatch_once(&loading, ^{
NSString *defaultPath = @"gRPCCertificates.bundle/roots"; // .pem
// Do not use NSBundle.mainBundle, as it's nil for tests of library projects.
NSBundle *bundle = [NSBundle bundleForClass:[self class]];
NSString *path = [bundle pathForResource:defaultPath ofType:@"pem"];
NSError *error;
// Files in PEM format can have non-ASCII characters in their comments (e.g. for the name of the
// issuer). Load them as UTF8 and produce an ASCII equivalent.
NSString *contentInUTF8 =
[NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
if (contentInUTF8 == nil) {
defaultRootsError = error;
return;
}
defaultRootsASCII = [self nullTerminatedDataWithString:contentInUTF8];
});
NSData *rootsASCII;
if (rootCerts != nil) {
rootsASCII = [self nullTerminatedDataWithString:rootCerts];
} else {
if (defaultRootsASCII == nil) {
if (errorPtr) {
*errorPtr = defaultRootsError;
}
NSAssert(
defaultRootsASCII, NSObjectNotAvailableException,
@"Could not read gRPCCertificates.bundle/roots.pem. This file, "
"with the root certificates, is needed to establish secure (TLS) connections. "
"Because the file is distributed with the gRPC library, this error is usually a sign "
"that the library wasn't configured correctly for your project. Error: %@",
defaultRootsError);
return nil;
}
rootsASCII = defaultRootsASCII;
}
grpc_channel_credentials *creds = NULL;
if (privateKey.length == 0 && certChain.length == 0) {
creds = grpc_ssl_credentials_create(rootsASCII.bytes, NULL, NULL, NULL);
} else {
grpc_ssl_pem_key_cert_pair key_cert_pair;
NSData *privateKeyASCII = [self nullTerminatedDataWithString:privateKey];
NSData *certChainASCII = [self nullTerminatedDataWithString:certChain];
key_cert_pair.private_key = privateKeyASCII.bytes;
key_cert_pair.cert_chain = certChainASCII.bytes;
if (key_cert_pair.private_key == NULL || key_cert_pair.cert_chain == NULL) {
creds = grpc_ssl_credentials_create(rootsASCII.bytes, NULL, NULL, NULL);
} else {
creds = grpc_ssl_credentials_create(rootsASCII.bytes, &key_cert_pair, NULL, NULL);
}
}
if ((self = [super init])) {
_channelCreds = creds;
}
return self;
}
- (grpc_channel *_Nullable)createChannelWithHost:(NSString *)host
channelArgs:(NSDictionary *_Nullable)args {
grpc_channel_args *coreChannelArgs = GRPCBuildChannelArgs([args copy]);
grpc_channel *unmanagedChannel =
grpc_secure_channel_create(_channelCreds, host.UTF8String, coreChannelArgs, NULL);
GRPCFreeChannelArgs(coreChannelArgs);
return unmanagedChannel;
}
- (void)dealloc {
if (_channelCreds != NULL) {
grpc_channel_credentials_release(_channelCreds);
}
}
@end
NS_ASSUME_NONNULL_END
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