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cert: Add SystemTrustStoreStaticUnix
It reads CA certificates from: * The file in environment variable SSL_CERT_FILE * The first available file of /etc/ssl/certs/ca-certificates.crt (Debian/Ubuntu/Gentoo etc.) /etc/pki/tls/certs/ca-bundle.crt (Fedora/RHEL 6) /etc/ssl/ca-bundle.pem (OpenSUSE) /etc/pki/tls/cacert.pem (OpenELEC) /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem (CentOS/RHEL 7) /etc/ssl/cert.pem (Alpine Linux) * Files in the directory of environment variable SSL_CERT_DIR * Files in the first available directory of /etc/ssl/certs (SLES10/SLES11, https://golang.org/issue/12139) /etc/pki/tls/certs (Fedora/RHEL) /system/etc/security/cacerts (Android)
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klzgrad
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@ -19,12 +19,17 @@
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#include <Security/Security.h>
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#endif
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#include <array>
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#include <memory>
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#include <vector>
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#include "base/environment.h"
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#include "base/files/file_enumerator.h"
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#include "base/files/file_path.h"
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#include "base/files/file_util.h"
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#include "base/logging.h"
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#include "base/no_destructor.h"
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#include "base/strings/string_split.h"
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#include "base/task/task_traits.h"
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#include "base/task/thread_pool.h"
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#include "build/build_config.h"
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@ -49,6 +54,8 @@
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#include "third_party/boringssl/src/include/openssl/pool.h"
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#elif BUILDFLAG(IS_WIN)
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#include "net/cert/internal/trust_store_win.h"
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#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_ANDROID)
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#include "base/lazy_instance.h"
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#endif
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#if BUILDFLAG(CHROME_ROOT_STORE_SUPPORTED)
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#include "net/cert/internal/trust_store_chrome.h"
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@ -326,6 +333,167 @@ std::unique_ptr<SystemTrustStore> CreateSslSystemTrustStoreChromeRoot() {
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return std::make_unique<DummySystemTrustStore>();
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}
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#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_ANDROID)
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namespace {
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// Copied from https://golang.org/src/crypto/x509/root_linux.go
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// Possible certificate files; stop after finding one.
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constexpr std::array<const char*, 6> kStaticRootCertFiles = {
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"/etc/ssl/certs/ca-certificates.crt", // Debian/Ubuntu/Gentoo etc.
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"/etc/pki/tls/certs/ca-bundle.crt", // Fedora/RHEL 6
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"/etc/ssl/ca-bundle.pem", // OpenSUSE
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"/etc/pki/tls/cacert.pem", // OpenELEC
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"/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem", // CentOS/RHEL 7
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"/etc/ssl/cert.pem", // Alpine Linux
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};
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// Possible directories with certificate files; stop after successfully
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// reading at least one file from a directory.
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constexpr std::array<const char*, 3> kStaticRootCertDirs = {
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"/etc/ssl/certs", // SLES10/SLES11, https://golang.org/issue/12139
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"/etc/pki/tls/certs", // Fedora/RHEL
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"/system/etc/security/cacerts", // Android
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};
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// The environment variable which identifies where to locate the SSL
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// certificate file. If set this overrides the system default.
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constexpr char kStaticCertFileEnv[] = "SSL_CERT_FILE";
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// The environment variable which identifies which directory to check for SSL
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// certificate files. If set this overrides the system default. It is a colon
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// separated list of directories.
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// See https://www.openssl.org/docs/man1.0.2/man1/c_rehash.html.
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constexpr char kStaticCertDirsEnv[] = "SSL_CERT_DIR";
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class StaticUnixSystemCerts {
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public:
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StaticUnixSystemCerts() : system_trust_store_(Create()) {}
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TrustStoreInMemory* system_trust_store() { return system_trust_store_.get(); }
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static std::unique_ptr<TrustStoreInMemory> Create() {
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auto ptr = std::make_unique<TrustStoreInMemory>();
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auto env = base::Environment::Create();
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std::string env_value;
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std::vector<std::string> cert_filenames(kStaticRootCertFiles.begin(),
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kStaticRootCertFiles.end());
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if (env->GetVar(kStaticCertFileEnv, &env_value) && !env_value.empty()) {
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cert_filenames = {env_value};
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}
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bool cert_file_ok = false;
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for (const auto& filename : cert_filenames) {
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std::string file;
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if (!base::ReadFileToString(base::FilePath(filename), &file))
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continue;
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if (AddCertificatesFromBytes(file.data(), file.size(), ptr.get())) {
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cert_file_ok = true;
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break;
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}
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}
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std::vector<std::string> cert_dirnames(kStaticRootCertDirs.begin(),
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kStaticRootCertDirs.end());
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if (env->GetVar(kStaticCertDirsEnv, &env_value) && !env_value.empty()) {
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cert_dirnames = base::SplitString(env_value, ":", base::TRIM_WHITESPACE,
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base::SPLIT_WANT_NONEMPTY);
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}
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bool cert_dir_ok = false;
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for (const auto& dir : cert_dirnames) {
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base::FileEnumerator e(base::FilePath(dir),
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/*recursive=*/true, base::FileEnumerator::FILES);
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for (auto filename = e.Next(); !filename.empty(); filename = e.Next()) {
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std::string file;
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if (!base::ReadFileToString(filename, &file)) {
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continue;
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}
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if (AddCertificatesFromBytes(file.data(), file.size(), ptr.get())) {
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cert_dir_ok = true;
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}
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}
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if (cert_dir_ok)
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break;
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}
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if (!cert_file_ok && !cert_dir_ok) {
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LOG(ERROR) << "No CA certificates were found. Try using environment "
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"variable SSL_CERT_FILE or SSL_CERT_DIR";
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}
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return ptr;
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}
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private:
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static bool AddCertificatesFromBytes(const char* data,
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size_t length,
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TrustStoreInMemory* store) {
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auto certs = X509Certificate::CreateCertificateListFromBytes(
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{reinterpret_cast<const uint8_t*>(data), length},
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X509Certificate::FORMAT_AUTO);
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bool certs_ok = false;
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for (const auto& cert : certs) {
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CertErrors errors;
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auto parsed = ParsedCertificate::Create(
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bssl::UpRef(cert->cert_buffer()),
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x509_util::DefaultParseCertificateOptions(), &errors);
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if (parsed) {
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if (!store->Contains(parsed.get())) {
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store->AddTrustAnchor(parsed);
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}
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certs_ok = true;
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} else {
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LOG(ERROR) << errors.ToDebugString();
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}
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}
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return certs_ok;
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}
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std::unique_ptr<TrustStoreInMemory> system_trust_store_;
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};
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base::LazyInstance<StaticUnixSystemCerts>::Leaky g_root_certs_static_unix =
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LAZY_INSTANCE_INITIALIZER;
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} // namespace
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class SystemTrustStoreStaticUnix : public SystemTrustStore {
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public:
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SystemTrustStoreStaticUnix() = default;
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TrustStore* GetTrustStore() override {
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return g_root_certs_static_unix.Get().system_trust_store();
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}
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bool UsesSystemTrustStore() const override { return true; }
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bool IsKnownRoot(const ParsedCertificate* trust_anchor) const override {
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return g_root_certs_static_unix.Get().system_trust_store()->Contains(
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trust_anchor);
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}
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};
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std::unique_ptr<SystemTrustStore> CreateSslSystemTrustStore() {
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return std::make_unique<SystemTrustStoreStaticUnix>();
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}
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#if BUILDFLAG(CHROME_ROOT_STORE_SUPPORTED)
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std::unique_ptr<SystemTrustStore> CreateSslSystemTrustStoreChromeRoot() {
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return std::make_unique<SystemTrustStoreChrome>(
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std::make_unique<TrustStoreChrome>(), StaticUnixSystemCerts::Create());
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}
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#else
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std::unique_ptr<SystemTrustStore> CreateSslSystemTrustStoreChromeRoot() {
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return std::make_unique<DummySystemTrustStore>();
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}
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#endif // CHROME_ROOT_STORE_SUPPORTED
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#elif BUILDFLAG(IS_WIN)
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// Using the Builtin Verifier w/o the Chrome Root Store is unsupported on
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