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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.
*
*/
#include <grpc/support/port_platform.h>
#include <grpc/slice_buffer.h>
#include "src/core/lib/security/security_connector/load_system_roots_linux.h"
#ifdef GPR_LINUX
#include "src/core/lib/security/security_connector/load_system_roots.h"
#include <dirent.h>
#include <fcntl.h>
#include <stdbool.h>
#include <string.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/gpr/env.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/inlined_vector.h"
#include "src/core/lib/iomgr/load_file.h"
namespace grpc_core {
namespace {
const char* kLinuxCertFiles[] = {
"/etc/ssl/certs/ca-certificates.crt", "/etc/pki/tls/certs/ca-bundle.crt",
"/etc/ssl/ca-bundle.pem", "/etc/pki/tls/cacert.pem",
"/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem"};
const char* kLinuxCertDirectories[] = {
"/etc/ssl/certs", "/system/etc/security/cacerts", "/usr/local/share/certs",
"/etc/pki/tls/certs", "/etc/openssl/certs"};
grpc_slice GetSystemRootCerts() {
grpc_slice valid_bundle_slice = grpc_empty_slice();
size_t num_cert_files_ = GPR_ARRAY_SIZE(kLinuxCertFiles);
for (size_t i = 0; i < num_cert_files_; i++) {
grpc_error* error =
grpc_load_file(kLinuxCertFiles[i], 1, &valid_bundle_slice);
if (error == GRPC_ERROR_NONE) {
return valid_bundle_slice;
}
}
return grpc_empty_slice();
}
} // namespace
void GetAbsoluteFilePath(const char* valid_file_dir,
const char* file_entry_name, char* path_buffer) {
if (valid_file_dir != nullptr && file_entry_name != nullptr) {
int path_len = snprintf(path_buffer, MAXPATHLEN, "%s/%s", valid_file_dir,
file_entry_name);
if (path_len == 0) {
gpr_log(GPR_ERROR, "failed to get absolute path for file: %s",
file_entry_name);
}
}
}
grpc_slice CreateRootCertsBundle(const char* certs_directory) {
grpc_slice bundle_slice = grpc_empty_slice();
if (certs_directory == nullptr) {
return bundle_slice;
}
DIR* ca_directory = opendir(certs_directory);
if (ca_directory == nullptr) {
return bundle_slice;
}
struct FileData {
char path[MAXPATHLEN];
off_t size;
};
InlinedVector<FileData, 2> roots_filenames;
size_t total_bundle_size = 0;
struct dirent* directory_entry;
while ((directory_entry = readdir(ca_directory)) != nullptr) {
struct stat dir_entry_stat;
const char* file_entry_name = directory_entry->d_name;
FileData file_data;
GetAbsoluteFilePath(certs_directory, file_entry_name, file_data.path);
int stat_return = stat(file_data.path, &dir_entry_stat);
if (stat_return == -1 || !S_ISREG(dir_entry_stat.st_mode)) {
// no subdirectories.
if (stat_return == -1) {
gpr_log(GPR_ERROR, "failed to get status for file: %s", file_data.path);
}
continue;
}
file_data.size = dir_entry_stat.st_size;
total_bundle_size += file_data.size;
roots_filenames.push_back(file_data);
}
closedir(ca_directory);
char* bundle_string = static_cast<char*>(gpr_zalloc(total_bundle_size + 1));
size_t bytes_read = 0;
for (size_t i = 0; i < roots_filenames.size(); i++) {
int file_descriptor = open(roots_filenames[i].path, O_RDONLY);
if (file_descriptor != -1) {
// Read file into bundle.
size_t cert_file_size = roots_filenames[i].size;
int read_ret =
read(file_descriptor, bundle_string + bytes_read, cert_file_size);
if (read_ret != -1) {
bytes_read += read_ret;
} else {
gpr_log(GPR_ERROR, "failed to read file: %s", roots_filenames[i].path);
}
}
}
bundle_slice = grpc_slice_new(bundle_string, bytes_read, gpr_free);
return bundle_slice;
}
grpc_slice LoadSystemRootCerts() {
grpc_slice result = grpc_empty_slice();
// Prioritize user-specified custom directory if flag is set.
char* custom_dir = gpr_getenv("GRPC_SYSTEM_SSL_ROOTS_DIR");
if (custom_dir != nullptr) {
result = CreateRootCertsBundle(custom_dir);
gpr_free(custom_dir);
}
// If the custom directory is empty/invalid/not specified, fallback to
// distribution-specific directory.
if (GRPC_SLICE_IS_EMPTY(result)) {
result = GetSystemRootCerts();
}
if (GRPC_SLICE_IS_EMPTY(result)) {
for (size_t i = 0; i < GPR_ARRAY_SIZE(kLinuxCertDirectories); i++) {
result = CreateRootCertsBundle(kLinuxCertDirectories[i]);
if (!GRPC_SLICE_IS_EMPTY(result)) {
break;
}
}
}
return result;
}
} // namespace grpc_core
#endif /* GPR_LINUX */
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