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/*
* Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of the
* License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "mforms/password_cache.h"
#include "base/log.h"
#include "base/threading.h"
#include <errno.h>
#include <cstdlib>
#include <cstring>
DEFAULT_LOG_DOMAIN("pwdcache");
#ifndef _WIN32
#include <sys/mman.h>
#define HAVE_MLOCK 1
#endif
using namespace mforms;
PasswordCache::PasswordCache()
{
storage_len = 0;
storage_size = 4*1024;
storage = (char*)malloc(storage_size);
if (!storage)
log_error("Unable to allocate memory for password cache, caching will be disabled (errno %i)\n", errno);
#ifdef HAVE_MLOCK
else
{
if (mlock(storage, storage_size) < 0)
{
log_error("mlock password cache (errno %i)\n", errno);
free(storage);
storage = NULL;
}
}
#endif
}
PasswordCache PasswordCache::instance;
static base::Mutex cache_mutex;
PasswordCache *PasswordCache::get()
{
return &instance;
}
PasswordCache::~PasswordCache()
{
if (storage)
{
memset(storage, 0, storage_size);
#ifdef HAVE_MLOCK
if (munlock(storage, storage_size) < 0)
log_error("munlock password cache failed (errno %i)\n", errno);
#endif
free(storage);
}
}
void PasswordCache::add_password(const std::string &service, const std::string &account, const char *password)
{
if (storage)
{
if (!password) password = "";
bool flag = false;
{
base::MutexLock lock(cache_mutex);
const char *opassword = find_password(service, account);
if (opassword)
{
if (strcmp(password, opassword) == 0)
return;
flag = true;
}
}
if (flag)
remove_password(service, account);
base::MutexLock lock(cache_mutex);
size_t reclen = sizeof(size_t) + service.size() + 1 + account.size() + 1 + strlen(password) + 1;
// increase buffer size if new record doesnt fit
while (storage_len + reclen > storage_size)
{
char *new_block;
size_t new_size = storage_size + 4*1024;
new_block = (char*)malloc(new_size);
if (new_block)
{
#ifdef HAVE_MLOCK
if (mlock(new_block, new_size) < 0)
{
log_error("mlock password cache (errno %i)\n", errno);
free(new_block);
throw std::runtime_error("Could not increase password cache size");
}
#endif
memcpy(new_block, storage, storage_len);
memset(storage, 0, storage_size);
#ifdef HAVE_MLOCK
if (munlock(storage, storage_size) < 0)
log_error("munlock password cache (errno %i)\n", errno);
#endif
free(storage);
storage = new_block;
storage_size = new_size;
}
else
throw std::runtime_error("Could not increase password cache size");
}
// store length of this record
*(size_t*)(storage + storage_len) = reclen;
storage_len += sizeof(reclen);
// store contents
memcpy(storage + storage_len, service.data(), service.size()+1);
storage_len += service.size()+1;
memcpy(storage + storage_len, account.data(), account.size()+1);
storage_len += account.size()+1;
memcpy(storage + storage_len, password, strlen(password)+1);
storage_len += strlen(password)+1;
}
else
throw std::runtime_error("Password storage is not available");
}
size_t PasswordCache::find_block(const std::string &service, const std::string &account)
{
size_t offset = 0;
while (offset < storage_len)
{
size_t recsize = *(size_t*)(storage+offset);
const char *recservice = storage+offset+sizeof(recsize);
const char *recaccount = storage+offset+sizeof(recsize)+strlen(recservice)+1;
if (strcmp(recservice, service.c_str()) == 0 &&
strcmp(recaccount, account.c_str()) == 0)
return offset;
offset += recsize;
}
return (size_t)-1;
}
void PasswordCache::remove_password(const std::string &service, const std::string &account)
{
if (storage)
{
base::MutexLock lock(cache_mutex);
size_t offset = find_block(service, account);
if (offset != (size_t)-1)
{
size_t recsize = *(size_t*)(storage+offset);
memmove(storage+offset, storage+offset+recsize, storage_len-recsize);
storage_len -= recsize;
}
}
}
const char *PasswordCache::find_password(const std::string &service, const std::string &account)
{
if (storage)
{
size_t offset = find_block(service, account);
if (offset != (size_t)-1)
{
const char *pwd = storage + offset + sizeof(size_t) + service.size()+1 + account.size()+1;
return pwd;
}
}
return 0;
}
bool PasswordCache::get_password(const std::string &service, const std::string &account, std::string &ret_password)
{
base::MutexLock lock(cache_mutex);
const char *tmp = find_password(service, account);
if (tmp)
ret_password = tmp;
return tmp != NULL;
}
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