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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=2 et ft=cpp: tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "KeyStoreConnector.h"
#include <fcntl.h>
#include <pwd.h>
#include <sys/stat.h>
#include <sys/un.h>
#include "nsISupportsImpl.h" // for MOZ_COUNT_CTOR, MOZ_COUNT_DTOR
#include "nsThreadUtils.h" // For NS_IsMainThread.
#define KEYSTORE_LOG(args...) printf(args);
namespace mozilla {
namespace ipc {
static const char KEYSTORE_SOCKET_PATH[] = "/dev/socket/keystore";
KeyStoreConnector::KeyStoreConnector(const char** const aAllowedUsers)
: mAllowedUsers(aAllowedUsers)
{
MOZ_COUNT_CTOR_INHERITED(KeyStoreConnector, UnixSocketConnector);
}
KeyStoreConnector::~KeyStoreConnector()
{
MOZ_COUNT_DTOR_INHERITED(KeyStoreConnector, UnixSocketConnector);
}
nsresult
KeyStoreConnector::CreateSocket(int& aFd) const
{
unlink(KEYSTORE_SOCKET_PATH);
aFd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (aFd < 0) {
KEYSTORE_LOG("Could not open KeyStore socket!");
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
KeyStoreConnector::SetSocketFlags(int aFd) const
{
static const int sReuseAddress = 1;
// Set close-on-exec bit.
int flags = TEMP_FAILURE_RETRY(fcntl(aFd, F_GETFD));
if (flags < 0) {
return NS_ERROR_FAILURE;
}
flags |= FD_CLOEXEC;
int res = TEMP_FAILURE_RETRY(fcntl(aFd, F_SETFD, flags));
if (res < 0) {
return NS_ERROR_FAILURE;
}
// Set non-blocking status flag.
flags = TEMP_FAILURE_RETRY(fcntl(aFd, F_GETFL));
if (flags < 0) {
return NS_ERROR_FAILURE;
}
flags |= O_NONBLOCK;
res = TEMP_FAILURE_RETRY(fcntl(aFd, F_SETFL, flags));
if (res < 0) {
return NS_ERROR_FAILURE;
}
// Set socket addr to be reused even if kernel is still waiting to close.
res = setsockopt(aFd, SOL_SOCKET, SO_REUSEADDR, &sReuseAddress,
sizeof(sReuseAddress));
if (res < 0) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
KeyStoreConnector::CheckPermission(int aFd) const
{
struct ucred userCred;
socklen_t len = sizeof(userCred);
if (getsockopt(aFd, SOL_SOCKET, SO_PEERCRED, &userCred, &len)) {
return NS_ERROR_FAILURE;
}
const struct passwd* userInfo = getpwuid(userCred.uid);
if (!userInfo) {
return NS_ERROR_FAILURE;
}
if (!mAllowedUsers) {
return NS_ERROR_FAILURE;
}
for (const char** user = mAllowedUsers; *user; ++user) {
if (!strcmp(*user, userInfo->pw_name)) {
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
nsresult
KeyStoreConnector::CreateAddress(struct sockaddr& aAddress,
socklen_t& aAddressLength) const
{
struct sockaddr_un* address =
reinterpret_cast<struct sockaddr_un*>(&aAddress);
size_t namesiz = strlen(KEYSTORE_SOCKET_PATH) + 1; // include trailing '\0'
if (namesiz > sizeof(address->sun_path)) {
KEYSTORE_LOG("Address too long for socket struct!");
return NS_ERROR_FAILURE;
}
address->sun_family = AF_UNIX;
memcpy(address->sun_path, KEYSTORE_SOCKET_PATH, namesiz);
aAddressLength = offsetof(struct sockaddr_un, sun_path) + namesiz;
return NS_OK;
}
// |UnixSocketConnector|
nsresult
KeyStoreConnector::ConvertAddressToString(const struct sockaddr& aAddress,
socklen_t aAddressLength,
nsACString& aAddressString)
{
MOZ_ASSERT(aAddress.sa_family == AF_UNIX);
const struct sockaddr_un* un =
reinterpret_cast<const struct sockaddr_un*>(&aAddress);
size_t len = aAddressLength - offsetof(struct sockaddr_un, sun_path);
aAddressString.Assign(un->sun_path, len);
return NS_OK;
}
nsresult
KeyStoreConnector::CreateListenSocket(struct sockaddr* aAddress,
socklen_t* aAddressLength,
int& aListenFd)
{
ScopedClose fd;
nsresult rv = CreateSocket(fd.rwget());
if (NS_FAILED(rv)) {
return rv;
}
rv = SetSocketFlags(fd);
if (NS_FAILED(rv)) {
return rv;
}
if (aAddress && aAddressLength) {
rv = CreateAddress(*aAddress, *aAddressLength);
if (NS_FAILED(rv)) {
return rv;
}
}
// Allow access for wpa_supplicant (different user, different group)
//
// TODO: Improve this by setting specific user/group for
// wpa_supplicant by calling |fchmod| and |fchown|.
//
chmod(KEYSTORE_SOCKET_PATH, S_IRUSR|S_IWUSR|
S_IRGRP|S_IWGRP|
S_IROTH|S_IWOTH);
aListenFd = fd.forget();
return NS_OK;
}
nsresult
KeyStoreConnector::AcceptStreamSocket(int aListenFd,
struct sockaddr* aAddress,
socklen_t* aAddressLength,
int& aStreamFd)
{
ScopedClose fd(
TEMP_FAILURE_RETRY(accept(aListenFd, aAddress, aAddressLength)));
if (fd < 0) {
NS_WARNING("Cannot accept file descriptor!");
return NS_ERROR_FAILURE;
}
nsresult rv = SetSocketFlags(fd);
if (NS_FAILED(rv)) {
return rv;
}
rv = CheckPermission(fd);
if (NS_FAILED(rv)) {
return rv;
}
aStreamFd = fd.forget();
return NS_OK;
}
nsresult
KeyStoreConnector::CreateStreamSocket(struct sockaddr* aAddress,
socklen_t* aAddressLength,
int& aStreamFd)
{
MOZ_CRASH("|KeyStoreConnector| does not support creating stream sockets.");
return NS_ERROR_FAILURE;
}
nsresult
KeyStoreConnector::Duplicate(UnixSocketConnector*& aConnector)
{
aConnector = new KeyStoreConnector(*this);
return NS_OK;
}
}
}
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