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pcloudcrypto.c
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pcloudcrypto.c
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/* Copyright (c) 2014 Anton Titov.
* Copyright (c) 2014 pCloud Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of pCloud Ltd nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL pCloud Ltd BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "plibs.h"
#include "pnetlibs.h"
#include "pssl.h"
#include "pcrypto.h"
#include "papi.h"
#include "pcloudcrypto.h"
#include "psettings.h"
#include "pfolder.h"
#include "pcache.h"
#include "pfileops.h"
#include "pmemlock.h"
#include "pstatus.h"
#include <string.h>
#define PSYNC_CRYPTO_API_ERR_INTERNAL -511
static PSYNC_THREAD int crypto_api_errno;
static PSYNC_THREAD char crypto_api_err[128];
static const char *crypto_errors[]={
"Success.",
"Encryption is not started.",
"Unexpected RSA encryption error.",
"Folder not found.",
"Invalid key.",
"Can not connect to server.",
"Folder is not encrypted."
};
static uint32_t crypto_started_l=0;
static psync_rsa_publickey_t crypto_pubkey=PSYNC_INVALID_RSA;
static psync_rsa_privatekey_t crypto_privkey=PSYNC_INVALID_RSA;
static pthread_rwlock_t crypto_lock=PTHREAD_RWLOCK_INITIALIZER;
static uint32_t crypto_started_un=0;
typedef struct {
uint32_t type;
uint32_t flags;
unsigned char salt[PSYNC_CRYPTO_PBKDF2_SALT_LEN];
unsigned char key[];
} priv_key_ver1;
typedef struct {
uint32_t type;
uint32_t flags;
unsigned char key[];
} pub_key_ver1;
typedef struct {
uint32_t type;
uint32_t flags;
unsigned char aeskey[PSYNC_AES256_KEY_SIZE];
unsigned char hmackey[PSYNC_CRYPTO_HMAC_SHA512_KEY_LEN];
} sym_key_ver1;
void psync_cloud_crypto_clean_cache(){
const char *prefixes[]={"DKEY", "FKEY", "FLDE", "FLDD", "SEEN"};
psync_cache_clean_starting_with_one_of(prefixes, ARRAY_SIZE(prefixes));
}
static void psync_cloud_crypto_setup_save_to_db(const unsigned char *rsapriv, size_t rsaprivlen, const unsigned char *rsapub, size_t rsapublen,
const unsigned char *salt, size_t saltlen, size_t iterations, time_t expires){
psync_sql_res *res;
res=psync_sql_prep_statement("REPLACE INTO setting (id, value) VALUES (?, ?)");
psync_sql_start_transaction();
psync_sql_bind_string(res, 1, "cryptosetup");
psync_sql_bind_uint(res, 2, 1);
psync_sql_run(res);
if (expires){
psync_sql_bind_string(res, 1, "cryptoexpires");
psync_sql_bind_uint(res, 2, expires);
psync_sql_run(res);
}
psync_sql_bind_string(res, 1, "crypto_private_key");
psync_sql_bind_blob(res, 2, (const char *)rsapriv, rsaprivlen);
psync_sql_run(res);
psync_sql_bind_string(res, 1, "crypto_public_key");
psync_sql_bind_blob(res, 2, (const char *)rsapub, rsapublen);
psync_sql_run(res);
psync_sql_bind_string(res, 1, "crypto_private_salt");
psync_sql_bind_blob(res, 2, (const char *)salt, saltlen);
psync_sql_run(res);
psync_sql_bind_string(res, 1, "crypto_private_iter");
psync_sql_bind_uint(res, 2, iterations);
psync_sql_run_free(res);
psync_sql_commit_transaction();
}
static int psync_cloud_crypto_setup_do_upload(const unsigned char *rsapriv, size_t rsaprivlen, const unsigned char *rsapub, size_t rsapublen,
const char *hint, time_t *cryptoexpires){
binparam params[]={P_STR("auth", psync_my_auth), P_LSTR("privatekey", rsapriv, rsaprivlen), P_LSTR("publickey", rsapub, rsapublen),
P_STR("hint", hint), P_STR("timeformat", "timestamp")};
psync_socket *api;
binresult *res;
uint64_t result;
int tries;
tries=0;
debug(D_NOTICE, "uploading keys");
while (1){
api=psync_apipool_get();
if (!api)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_SETUP_CANT_CONNECT);
res=send_command(api, "crypto_setuserkeys", params);
if (unlikely_log(!res)){
psync_apipool_release_bad(api);
if (++tries>5)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_SETUP_CANT_CONNECT);
}
else{
psync_apipool_release(api);
break;
}
}
result=psync_find_result(res, "result", PARAM_NUM)->num;
if (!result)
*cryptoexpires=psync_find_result(res, "cryptoexpires", PARAM_NUM)->num;
psync_free(res);
if (result!=0)
debug(D_WARNING, "crypto_setuserkeys returned %u", (unsigned)result);
if (result==0)
return PSYNC_CRYPTO_SETUP_SUCCESS;
psync_process_api_error(result);
switch (result){
case 1000: return PRINT_RETURN_CONST(PSYNC_CRYPTO_SETUP_NOT_LOGGED_IN);
case 2000: return PRINT_RETURN_CONST(PSYNC_CRYPTO_SETUP_CANT_CONNECT);
case 2110: return PRINT_RETURN_CONST(PSYNC_CRYPTO_SETUP_ALREADY_SETUP);
}
return PRINT_RETURN_CONST(PSYNC_CRYPTO_SETUP_UNKNOWN_ERROR);
}
static int psync_cloud_crypto_setup_upload(const unsigned char *rsapriv, size_t rsaprivlen, const unsigned char *rsapub, size_t rsapublen,
const unsigned char *salt, const char *hint, time_t *cryptoexpires){
priv_key_ver1 *priv;
pub_key_ver1 *pub;
unsigned char *b64priv, *b64pub;
size_t b64privlen, b64publen;
int ret;
*cryptoexpires=0;
priv=(priv_key_ver1 *)psync_malloc(offsetof(priv_key_ver1, key)+rsaprivlen);
priv->type=PSYNC_CRYPTO_TYPE_RSA4096_64BYTESALT_20000IT;
priv->flags=0;
memcpy(priv->salt, salt, PSYNC_CRYPTO_PBKDF2_SALT_LEN);
memcpy(priv->key, rsapriv, rsaprivlen);
pub=(pub_key_ver1 *)psync_malloc(offsetof(pub_key_ver1, key)+rsapublen);
pub->type=PSYNC_CRYPTO_PUB_TYPE_RSA4096;
pub->flags=0;
memcpy(pub->key, rsapub, rsapublen);
b64priv=psync_base64_encode((unsigned char *)priv, offsetof(priv_key_ver1, key)+rsaprivlen, &b64privlen);
b64pub=psync_base64_encode((unsigned char *)pub, offsetof(pub_key_ver1, key)+rsapublen, &b64publen);
psync_free(priv);
psync_free(pub);
ret=psync_cloud_crypto_setup_do_upload(b64priv, b64privlen, b64pub, b64publen, hint, cryptoexpires);
psync_free(b64priv);
psync_free(b64pub);
return ret;
}
/*
* generate 64 byte (512 bit) salt for PBKDF2
* generate AES key and IV with PBKDF2
* create RSA key and encrypt private part using CTR mode
* upload to server salt, encrypted private and public
*
*/
int psync_cloud_crypto_setup(const char *password, const char *hint){
unsigned char salt[PSYNC_CRYPTO_PBKDF2_SALT_LEN];
psync_symmetric_key_t aeskey;
psync_crypto_aes256_ctr_encoder_decoder_t enc;
psync_rsa_t rsa;
psync_rsa_privatekey_t rsaprivate;
psync_rsa_publickey_t rsapublic;
psync_binary_rsa_key_t rsaprivatebin, rsapublicbin;
time_t cryptoexpires;
int ret;
debug(D_NOTICE, "generating salt");
psync_ssl_rand_strong(salt, PSYNC_CRYPTO_PBKDF2_SALT_LEN);
debug(D_NOTICE, "generating AES key from password and setting up encoder");
aeskey=psync_ssl_gen_symmetric_key_from_pass(password, PSYNC_AES256_KEY_SIZE+PSYNC_AES256_BLOCK_SIZE,
salt, PSYNC_CRYPTO_PBKDF2_SALT_LEN, PSYNC_CRYPTO_PASS_TO_KEY_ITERATIONS);
enc=psync_crypto_aes256_ctr_encoder_decoder_create(aeskey);
psync_ssl_free_symmetric_key(aeskey);
if (unlikely(enc==PSYNC_CRYPTO_INVALID_ENCODER)){
debug(D_WARNING, "psync_crypto_aes256_ctr_encoder_decoder_create failed");
return PSYNC_CRYPTO_SETUP_KEYGEN_FAILED;
}
debug(D_NOTICE, "generating %d bit RSA key", (int)PSYNC_CRYPTO_RSA_SIZE);
rsa=psync_ssl_gen_rsa(PSYNC_CRYPTO_RSA_SIZE);
if (unlikely(rsa==PSYNC_INVALID_RSA)){
debug(D_WARNING, "RSA key generation failed");
psync_crypto_aes256_ctr_encoder_decoder_free(enc);
return PSYNC_CRYPTO_SETUP_KEYGEN_FAILED;
}
else
debug(D_NOTICE, "RSA key generated");
rsaprivate=psync_ssl_rsa_get_private(rsa);
rsapublic=psync_ssl_rsa_get_public(rsa);
psync_ssl_free_rsa(rsa);
if (unlikely(rsaprivate==PSYNC_INVALID_RSA || rsapublic==PSYNC_INVALID_RSA)){
debug(D_WARNING, "psync_ssl_rsa_get_private or psync_ssl_rsa_get_public failed");
if (rsaprivate!=PSYNC_INVALID_RSA)
psync_ssl_rsa_free_private(rsaprivate);
if (rsapublic!=PSYNC_INVALID_RSA)
psync_ssl_rsa_free_public(rsapublic);
psync_crypto_aes256_ctr_encoder_decoder_free(enc);
return PSYNC_CRYPTO_SETUP_KEYGEN_FAILED;
}
rsaprivatebin=psync_ssl_rsa_private_to_binary(rsaprivate);
rsapublicbin=psync_ssl_rsa_public_to_binary(rsapublic);
psync_ssl_rsa_free_private(rsaprivate);
psync_ssl_rsa_free_public(rsapublic);
if (unlikely(rsaprivatebin==PSYNC_INVALID_BIN_RSA || rsapublic==PSYNC_INVALID_BIN_RSA)){
debug(D_WARNING, "psync_ssl_rsa_private_to_binary or psync_ssl_rsa_public_to_binary failed");
if (rsaprivatebin!=PSYNC_INVALID_BIN_RSA)
psync_ssl_rsa_free_binary(rsaprivatebin);
if (rsapublicbin!=PSYNC_INVALID_BIN_RSA)
psync_ssl_rsa_free_binary(rsapublicbin);
psync_crypto_aes256_ctr_encoder_decoder_free(enc);
return PSYNC_CRYPTO_SETUP_KEYGEN_FAILED;
}
debug(D_NOTICE, "encoding private key");
psync_crypto_aes256_ctr_encode_decode_inplace(enc, rsaprivatebin->data, rsaprivatebin->datalen, 0);
psync_crypto_aes256_ctr_encoder_decoder_free(enc);
debug(D_NOTICE, "encoded private key, uploading keys");
ret=psync_cloud_crypto_setup_upload(rsaprivatebin->data, rsaprivatebin->datalen, rsapublicbin->data, rsapublicbin->datalen, salt, hint, &cryptoexpires);
if (unlikely(ret!=PSYNC_CRYPTO_SETUP_SUCCESS)){
debug(D_WARNING, "keys upload failed with error %d", ret);
psync_ssl_rsa_free_binary(rsaprivatebin);
psync_ssl_rsa_free_binary(rsapublicbin);
return ret;
}
debug(D_NOTICE, "keys uploaded");
psync_cloud_crypto_setup_save_to_db(rsaprivatebin->data, rsaprivatebin->datalen, rsapublicbin->data, rsapublicbin->datalen,
salt, PSYNC_CRYPTO_PBKDF2_SALT_LEN, PSYNC_CRYPTO_PASS_TO_KEY_ITERATIONS, cryptoexpires);
psync_ssl_rsa_free_binary(rsaprivatebin);
psync_ssl_rsa_free_binary(rsapublicbin);
return PSYNC_CRYPTO_SETUP_SUCCESS;
}
int psync_cloud_crypto_get_hint(char **hint){
binparam params[]={P_STR("auth", psync_my_auth)};
psync_socket *api;
binresult *res;
uint64_t result;
int tries;
tries=0;
debug(D_NOTICE, "dowloading hint");
while (1){
api=psync_apipool_get();
if (!api)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_HINT_CANT_CONNECT);
res=send_command(api, "crypto_getuserhint", params);
if (unlikely_log(!res)){
psync_apipool_release_bad(api);
if (++tries>5)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_HINT_CANT_CONNECT);
}
else{
psync_apipool_release(api);
break;
}
}
result=psync_find_result(res, "result", PARAM_NUM)->num;
if (result){
psync_free(res);
psync_process_api_error(result);
switch (result){
case 2122: return PRINT_RETURN_CONST(PSYNC_CRYPTO_HINT_NOT_PROVIDED);
case 2000: return PRINT_RETURN_CONST(PSYNC_CRYPTO_HINT_CANT_CONNECT);
case 1000: return PRINT_RETURN_CONST(PSYNC_CRYPTO_HINT_NOT_LOGGED_IN);
}
return PRINT_RETURN_CONST(PSYNC_CRYPTO_HINT_UNKNOWN_ERROR);
}
*hint=psync_strdup(psync_find_result(res, "hint", PARAM_STR)->str);
psync_free(res);
return PSYNC_CRYPTO_HINT_SUCCESS;
}
static int psync_cloud_crypto_download_keys(unsigned char **rsapriv, size_t *rsaprivlen, unsigned char **rsapub, size_t *rsapublen,
unsigned char **salt, size_t *saltlen, size_t *iterations){
binparam params[]={P_STR("auth", psync_my_auth)};
psync_socket *api;
binresult *res;
const binresult *data;
unsigned char *rsaprivstruct, *rsapubstruct;
uint64_t result;
size_t rsaprivstructlen, rsapubstructlen;
int tries;
tries=0;
debug(D_NOTICE, "dowloading keys");
while (1){
api=psync_apipool_get();
if (!api)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_CANT_CONNECT);
res=send_command(api, "crypto_getuserkeys", params);
if (unlikely_log(!res)){
psync_apipool_release_bad(api);
if (++tries>5)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_CANT_CONNECT);
}
else{
psync_apipool_release(api);
break;
}
}
result=psync_find_result(res, "result", PARAM_NUM)->num;
if (result){
psync_free(res);
psync_process_api_error(result);
switch (result){
case 2111: return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_NOT_SETUP);
case 2000: return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_CANT_CONNECT);
case 1000: return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_NOT_LOGGED_IN);
}
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_UNKNOWN_ERROR);
}
data=psync_find_result(res, "privatekey", PARAM_STR);
rsaprivstruct=psync_base64_decode((const unsigned char *)data->str, data->length, &rsaprivstructlen);
data=psync_find_result(res, "publickey", PARAM_STR);
rsapubstruct=psync_base64_decode((const unsigned char *)data->str, data->length, &rsapubstructlen);
psync_free(res);
switch (*((uint32_t *)rsapubstruct)){
case PSYNC_CRYPTO_PUB_TYPE_RSA4096:
if (offsetof(pub_key_ver1, key)>=rsapubstructlen)
goto def1;
*rsapublen=rsapubstructlen-offsetof(pub_key_ver1, key);
*rsapub=(unsigned char *)psync_malloc(*rsapublen);
memcpy(*rsapub, rsapubstruct+offsetof(pub_key_ver1, key), *rsapublen);
break;
default:
def1:
psync_free(rsaprivstruct);
psync_free(rsapubstruct);
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_UNKNOWN_KEY_FORMAT);
}
switch (*((uint32_t *)rsaprivstruct)){
case PSYNC_CRYPTO_TYPE_RSA4096_64BYTESALT_20000IT:
if (offsetof(priv_key_ver1, key)>=rsaprivstructlen)
goto def2;
*rsaprivlen=rsaprivstructlen-offsetof(priv_key_ver1, key);
*rsapriv=(unsigned char *)psync_malloc(*rsaprivlen);
memcpy(*rsapriv, rsaprivstruct+offsetof(priv_key_ver1, key), *rsaprivlen);
*saltlen=PSYNC_CRYPTO_PBKDF2_SALT_LEN;
*salt=(unsigned char *)psync_malloc(PSYNC_CRYPTO_PBKDF2_SALT_LEN);
memcpy(*salt, rsaprivstruct+offsetof(priv_key_ver1, salt), PSYNC_CRYPTO_PBKDF2_SALT_LEN);
*iterations=PSYNC_CRYPTO_PASS_TO_KEY_ITERATIONS;
break;
default:
def2:
psync_free(*rsapub);
psync_free(rsaprivstruct);
psync_free(rsapubstruct);
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_UNKNOWN_KEY_FORMAT);
}
psync_free(rsaprivstruct);
psync_free(rsapubstruct);
return PSYNC_CRYPTO_START_SUCCESS;
}
static int crypto_keys_match(){
psync_symmetric_key_t key, deckey;
psync_encrypted_symmetric_key_t enckey;
int res;
debug(D_NOTICE, "trying encrypt/decrypt operation with loaded keys");
key=(psync_symmetric_key_t)psync_malloc(offsetof(psync_symmetric_key_struct_t, key)+64);
key->keylen=64;
psync_ssl_rand_weak(key->key, key->keylen);
enckey=psync_ssl_rsa_encrypt_symmetric_key(crypto_pubkey, key);
if (enckey==PSYNC_INVALID_ENC_SYM_KEY){
psync_free(key);
return 0;
}
deckey=psync_ssl_rsa_decrypt_symmetric_key(crypto_privkey, enckey);
psync_free(enckey);
if (deckey==PSYNC_INVALID_SYM_KEY){
psync_free(key);
return 0;
}
res=key->keylen==deckey->keylen && !memcmp(key->key, deckey->key, key->keylen);
psync_ssl_free_symmetric_key(deckey);
psync_free(key);
if (res)
debug(D_NOTICE, "encrypt/decrypt operation succeeded");
return res;
}
static void load_str_to(const psync_variant *v, unsigned char **ptr, size_t *len){
const char *str;
size_t l;
str=psync_get_lstring(*v, &l);
*ptr=(unsigned char *)psync_malloc(l);
memcpy(*ptr, str, l);
*len=l;
}
int psync_cloud_crypto_start(const char *password){
psync_sql_res *res;
psync_variant_row row;
const char *id;
unsigned char *rsapriv, *rsaprivdec, *rsapub, *salt;
size_t iterations, rsaprivlen, rsapublen, saltlen;
psync_symmetric_key_t aeskey;
psync_crypto_aes256_ctr_encoder_decoder_t enc;
uint32_t rowcnt;
int ret;
/*
* Read locks of crypto_lock are taken both before and after taking sql_lock. While read locks are concurrent and can not lead
* to deadlock it is possible to have some thread to hold sql_lock and wait for read lock. This will normally deadlock with
* us holding writelock and waiting for sql_lock. Therefore we use sql_trylock here.
*
*/
retry:
pthread_rwlock_wrlock(&crypto_lock);
if (crypto_started_l){
pthread_rwlock_unlock(&crypto_lock);
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_ALREADY_STARTED);
}
rowcnt=0;
rsapriv=rsapub=salt=NULL;
iterations=0;
if (psync_sql_trylock()){
pthread_rwlock_unlock(&crypto_lock);
psync_milisleep(1);
goto retry;
}
res=psync_sql_query_nolock("SELECT id, value FROM setting WHERE id IN ('crypto_private_key', 'crypto_public_key', 'crypto_private_salt', 'crypto_private_iter')");
while ((row=psync_sql_fetch_row(res))){
id=psync_get_string(row[0]);
rowcnt++;
if (!strcmp(id, "crypto_private_key"))
load_str_to(&row[1], &rsapriv, &rsaprivlen);
else if (!strcmp(id, "crypto_public_key"))
load_str_to(&row[1], &rsapub, &rsapublen);
else if (!strcmp(id, "crypto_private_salt"))
load_str_to(&row[1], &salt, &saltlen);
else{
assert(!strcmp(id, "crypto_private_iter"));
iterations=atoi(psync_get_string(row[1]));
}
}
psync_sql_free_result(res);
psync_sql_unlock();
if (rowcnt<4){
if (unlikely(rowcnt!=0)){
debug(D_BUG, "only some of records found in the database, should not happen");
psync_free(rsapriv);
psync_free(rsapub);
psync_free(salt);
}
ret=psync_cloud_crypto_download_keys(&rsapriv, &rsaprivlen, &rsapub, &rsapublen, &salt, &saltlen, &iterations);
if (ret!=PSYNC_CRYPTO_START_SUCCESS){
pthread_rwlock_unlock(&crypto_lock);
debug(D_WARNING, "downloading key failed, error %d", ret);
return ret;
}
else
debug(D_NOTICE, "dowloaded keys");
}
else{
debug(D_NOTICE, "got keys from the database");
assert(rowcnt==4);
}
crypto_pubkey=psync_ssl_rsa_load_public(rsapub, rsapublen);
if (crypto_pubkey==PSYNC_INVALID_RSA){
pthread_rwlock_unlock(&crypto_lock);
debug(D_WARNING, "could not load public key");
psync_free(rsapriv);
psync_free(rsapub);
psync_free(salt);
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_UNKNOWN_KEY_FORMAT);
}
aeskey=psync_ssl_gen_symmetric_key_from_pass(password, PSYNC_AES256_KEY_SIZE+PSYNC_AES256_BLOCK_SIZE, salt, saltlen, iterations);
enc=psync_crypto_aes256_ctr_encoder_decoder_create(aeskey);
psync_ssl_free_symmetric_key(aeskey);
rsaprivdec=(unsigned char *)psync_locked_malloc(rsaprivlen);
memcpy(rsaprivdec, rsapriv, rsaprivlen);
psync_crypto_aes256_ctr_encode_decode_inplace(enc, rsaprivdec, rsaprivlen, 0);
psync_crypto_aes256_ctr_encoder_decoder_free(enc);
crypto_privkey=psync_ssl_rsa_load_private(rsaprivdec, rsaprivlen);
psync_ssl_memclean(rsaprivdec, rsaprivlen);
psync_locked_free(rsaprivdec);
if (crypto_privkey==PSYNC_INVALID_RSA){
psync_ssl_rsa_free_public(crypto_pubkey);
crypto_pubkey=PSYNC_INVALID_RSA;
pthread_rwlock_unlock(&crypto_lock);
debug(D_NOTICE, "bad password");
psync_free(rsapriv);
psync_free(rsapub);
psync_free(salt);
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_BAD_PASSWORD);
}
if (!crypto_keys_match()){
psync_ssl_rsa_free_public(crypto_pubkey);
crypto_pubkey=PSYNC_INVALID_RSA;
psync_ssl_rsa_free_private(crypto_privkey);
crypto_privkey=PSYNC_INVALID_RSA;
pthread_rwlock_unlock(&crypto_lock);
debug(D_ERROR, "keys don't match");
psync_free(rsapriv);
psync_free(rsapub);
psync_free(salt);
return PRINT_RETURN_CONST(PSYNC_CRYPTO_START_KEYS_DONT_MATCH);
}
crypto_started_l=1;
pthread_rwlock_unlock(&crypto_lock);
crypto_started_un=1;
if (rowcnt<4)
psync_cloud_crypto_setup_save_to_db(rsapriv, rsaprivlen, rsapub, rsapublen, salt, saltlen, iterations, 0);
psync_free(rsapriv);
psync_free(rsapub);
psync_free(salt);
debug(D_NOTICE, "crypto successfully started");
return PSYNC_CRYPTO_START_SUCCESS;
}
static void psync_fs_refresh_crypto_folders(){
psync_folderid_t *fids, *fid;
fids=psync_crypto_folderids();
fid=fids;
while (*fid!=PSYNC_CRYPTO_INVALID_FOLDERID){
psync_fs_refresh_folder(*fid);
fid++;
}
psync_free(fids);
}
int psync_cloud_crypto_stop(){
crypto_started_un=0;
pthread_rwlock_wrlock(&crypto_lock);
if (!crypto_started_l){
pthread_rwlock_unlock(&crypto_lock);
return PRINT_RETURN_CONST(PSYNC_CRYPTO_STOP_NOT_STARTED);
}
crypto_started_l=0;
psync_ssl_rsa_free_public(crypto_pubkey);
crypto_pubkey=PSYNC_INVALID_RSA;
psync_ssl_rsa_free_private(crypto_privkey);
crypto_privkey=PSYNC_INVALID_RSA;
pthread_rwlock_unlock(&crypto_lock);
debug(D_NOTICE, "stopped crypto");
psync_cloud_crypto_clean_cache();
psync_fs_refresh_crypto_folders();
return PSYNC_CRYPTO_STOP_SUCCESS;
}
int psync_cloud_crypto_isstarted(){
int ret;
pthread_rwlock_rdlock(&crypto_lock);
ret=crypto_started_l;
pthread_rwlock_unlock(&crypto_lock);
return ret;
}
int psync_cloud_crypto_reset(){
binparam params[]={P_STR("auth", psync_my_auth)};
psync_socket *api;
binresult *res;
uint32_t result;
int tries;
/* pthread_rwlock_rdlock(&crypto_lock);
result=crypto_started_l;
pthread_rwlock_unlock(&crypto_lock);
if (result)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_CRYPTO_IS_STARTED);*/
if (!psync_crypto_issetup())
return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_NOT_SETUP);
debug(D_NOTICE, "resetting crypto");
tries=0;
while (1){
api=psync_apipool_get();
if (!api)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_CANT_CONNECT);
res=send_command(api, "crypto_reset", params);
if (unlikely_log(!res)){
psync_apipool_release_bad(api);
if (++tries>5)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_CANT_CONNECT);
}
else{
psync_apipool_release(api);
break;
}
}
result=psync_find_result(res, "result", PARAM_NUM)->num;
psync_free(res);
if (result)
debug(D_WARNING, "crypto_reset returned error %u", (unsigned)result);
if (result==0)
return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_SUCCESS);
psync_process_api_error(result);
switch (result){
case 2000: return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_NOT_LOGGED_IN);
case 2111: return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_NOT_SETUP);
default: return PRINT_RETURN_CONST(PSYNC_CRYPTO_RESET_UNKNOWN_ERROR);
}
}
static void *err_to_ptr(int err){
return (void *)(uintptr_t)(-err);
}
static void set_crypto_err_msg(const binresult *res){
const binresult *msg;
size_t l;
msg=psync_find_result(res, "error", PARAM_STR);
l=msg->length+1;
if (l>=sizeof(crypto_api_err))
l=sizeof(crypto_api_err)-1;
memcpy(crypto_api_err, msg->str, l);
}
typedef struct {
psync_encrypted_symmetric_key_t key;
psync_folderid_t id;
} insert_folder_key_task;
static void save_folder_key_task(void *ptr){
insert_folder_key_task *t;
psync_sql_res *res;
t=(insert_folder_key_task *)ptr;
res=psync_sql_prep_statement("REPLACE INTO cryptofolderkey (folderid, enckey) VALUES (?, ?)");
psync_sql_bind_uint(res, 1, t->id);
psync_sql_bind_blob(res, 2, (const char *)t->key->data, t->key->datalen);
psync_sql_run_free(res);
psync_free(t->key);
psync_free(t);
}
static void save_folder_key_to_db(psync_folderid_t folderid, psync_encrypted_symmetric_key_t enckey){
// we are likely holding (few) read locks on the database, so executing here will deadlock
insert_folder_key_task *t;
t=psync_new(insert_folder_key_task);
t->key=psync_ssl_copy_encrypted_symmetric_key(enckey);
t->id=folderid;
psync_run_thread1("save folder key to db task", save_folder_key_task, t);
}
typedef struct {
psync_encrypted_symmetric_key_t key;
psync_fileid_t id;
uint64_t hash;
} insert_file_key_task;
static void save_file_key_task(void *ptr){
insert_file_key_task *t;
psync_sql_res *res;
t=(insert_file_key_task *)ptr;
res=psync_sql_prep_statement("REPLACE INTO cryptofilekey (fileid, hash, enckey) VALUES (?, ?, ?)");
psync_sql_bind_uint(res, 1, t->id);
psync_sql_bind_uint(res, 2, t->hash);
psync_sql_bind_blob(res, 3, (const char *)t->key->data, t->key->datalen);
psync_sql_run_free(res);
psync_free(t->key);
psync_free(t);
}
static void save_file_key_to_db(psync_fileid_t fileid, uint64_t hash, psync_encrypted_symmetric_key_t enckey){
insert_file_key_task *t;
t=psync_new(insert_file_key_task);
t->key=psync_ssl_copy_encrypted_symmetric_key(enckey);
t->id=fileid;
t->hash=hash;
psync_run_thread1("save file key to db task", save_file_key_task, t);
}
static psync_encrypted_symmetric_key_t psync_crypto_download_folder_enc_key(psync_folderid_t folderid){
binparam params[]={P_STR("auth", psync_my_auth), P_NUM("folderid", folderid)};
psync_socket *api;
binresult *res;
const binresult *b64key;
uint64_t result;
unsigned char *key;
psync_encrypted_symmetric_key_t ret;
size_t keylen;
int tries;
tries=0;
debug(D_NOTICE, "downloading key for folder %lu", (unsigned long)folderid);
while (1){
api=psync_apipool_get();
if (!api)
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_CANT_CONNECT));
res=send_command(api, "crypto_getfolderkey", params);
if (unlikely_log(!res)){
psync_apipool_release_bad(api);
if (++tries>5)
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_CANT_CONNECT));
}
else{
psync_apipool_release(api);
break;
}
}
result=psync_find_result(res, "result", PARAM_NUM)->num;
if (result){
debug(D_NOTICE, "got error %lu from crypto_getfolderkey", (unsigned long)result);
crypto_api_errno=result;
set_crypto_err_msg(res);
psync_free(res);
psync_process_api_error(result);
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_API_ERR_INTERNAL));
}
b64key=psync_find_result(res, "key", PARAM_STR);
key=psync_base64_decode((const unsigned char *)b64key->str, b64key->length, &keylen);
psync_free(res);
if (!key)
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_INVALID_KEY));
ret=psync_ssl_alloc_encrypted_symmetric_key(keylen);
memcpy(ret->data, key, keylen);
psync_free(key);
save_folder_key_to_db(folderid, ret);
return ret;
}
static psync_encrypted_symmetric_key_t psync_crypto_download_file_enc_key(psync_fileid_t fileid){
binparam params[]={P_STR("auth", psync_my_auth), P_NUM("fileid", fileid)};
psync_socket *api;
binresult *res;
const binresult *b64key;
uint64_t result;
unsigned char *key;
psync_encrypted_symmetric_key_t ret;
size_t keylen;
int tries;
tries=0;
debug(D_NOTICE, "downloading key for file %lu", (unsigned long)fileid);
while (1){
api=psync_apipool_get();
if (!api)
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_CANT_CONNECT));
res=send_command(api, "crypto_getfilekey", params);
if (unlikely_log(!res)){
psync_apipool_release_bad(api);
if (++tries>5)
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_CANT_CONNECT));
}
else{
psync_apipool_release(api);
break;
}
}
result=psync_find_result(res, "result", PARAM_NUM)->num;
if (result){
debug(D_NOTICE, "got error %lu from crypto_getfilekey", (unsigned long)result);
crypto_api_errno=result;
set_crypto_err_msg(res);
psync_free(res);
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_API_ERR_INTERNAL));
}
result=psync_find_result(res, "hash", PARAM_NUM)->num;
b64key=psync_find_result(res, "key", PARAM_STR);
key=psync_base64_decode((const unsigned char *)b64key->str, b64key->length, &keylen);
psync_free(res);
if (!key)
return (psync_encrypted_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_INVALID_KEY));
ret=psync_ssl_alloc_encrypted_symmetric_key(keylen);
memcpy(ret->data, key, keylen);
psync_free(key);
save_file_key_to_db(fileid, result, ret);
return ret;
}
static psync_encrypted_symmetric_key_t psync_crypto_get_folder_enc_key(psync_folderid_t folderid){
psync_encrypted_symmetric_key_t enckey;
psync_sql_res *res;
psync_variant_row row;
const char *ckey;
size_t ckeylen;
res=psync_sql_query_rdlock("SELECT enckey FROM cryptofolderkey WHERE folderid=?");
psync_sql_bind_uint(res, 1, folderid);
if ((row=psync_sql_fetch_row(res))){
ckey=psync_get_lstring(row[0], &ckeylen);
enckey=psync_ssl_alloc_encrypted_symmetric_key(ckeylen);
memcpy(enckey->data, ckey, ckeylen);
psync_sql_free_result(res);
return enckey;
}
psync_sql_free_result(res);
return psync_crypto_download_folder_enc_key(folderid);
}
static psync_encrypted_symmetric_key_t psync_crypto_get_file_enc_key(psync_fileid_t fileid, uint64_t hash, int nonetwork){
psync_encrypted_symmetric_key_t enckey;
psync_sql_res *res;
psync_variant_row row;
const char *ckey;
size_t ckeylen;
res=psync_sql_query_rdlock("SELECT enckey FROM cryptofilekey WHERE fileid=? AND hash=?");
psync_sql_bind_uint(res, 1, fileid);
psync_sql_bind_uint(res, 2, hash);
if ((row=psync_sql_fetch_row(res))){
ckey=psync_get_lstring(row[0], &ckeylen);
enckey=psync_ssl_alloc_encrypted_symmetric_key(ckeylen);
memcpy(enckey->data, ckey, ckeylen);
psync_sql_free_result(res);
return enckey;
}
psync_sql_free_result(res);
if (nonetwork){
debug(D_NOTICE, "delaying key download for file %lu", (unsigned long)fileid);
return (psync_encrypted_symmetric_key_t)PSYNC_CRYPTO_UNLOADED_SECTOR_ENCODER;
}
else
return psync_crypto_download_file_enc_key(fileid);
}
static psync_symmetric_key_t psync_crypto_get_folder_symkey_locked(psync_folderid_t folderid){
char buff[16];
psync_encrypted_symmetric_key_t enckey;
psync_symmetric_key_t symkey;
psync_get_string_id(buff, "FKEY", folderid);
symkey=(psync_symmetric_key_t)psync_cache_get(buff);
if (symkey)
return symkey;
enckey=psync_crypto_get_folder_enc_key(folderid);
if (psync_crypto_is_error(enckey))
return (psync_symmetric_key_t)enckey;
symkey=psync_ssl_rsa_decrypt_symmetric_key(crypto_privkey, enckey);
psync_free(enckey);
if (symkey==PSYNC_INVALID_SYM_KEY)
return (psync_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_INVALID_KEY));
return symkey;
}
static psync_symmetric_key_t psync_crypto_get_file_symkey_locked(psync_fileid_t fileid, uint64_t hash, int nonetwork){
char buff[32];
psync_encrypted_symmetric_key_t enckey;
psync_symmetric_key_t symkey;
psync_get_string_id2(buff, "DKEY", fileid, hash);
symkey=(psync_symmetric_key_t)psync_cache_get(buff);
if (symkey){
debug(D_NOTICE, "got key for file %lu from cache", (unsigned long)fileid);
return symkey;
}
enckey=psync_crypto_get_file_enc_key(fileid, hash, nonetwork);
if (unlikely_log(psync_crypto_is_error(enckey)))
return (psync_symmetric_key_t)enckey;
if (nonetwork && enckey==(psync_encrypted_symmetric_key_t)PSYNC_CRYPTO_UNLOADED_SECTOR_ENCODER)
return (psync_symmetric_key_t)PSYNC_CRYPTO_UNLOADED_SECTOR_ENCODER;
symkey=psync_ssl_rsa_decrypt_symmetric_key(crypto_privkey, enckey);
psync_free(enckey);
if (unlikely_log(symkey==PSYNC_INVALID_SYM_KEY))
return (psync_symmetric_key_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_INVALID_KEY));
return symkey;
}
static void psync_crypto_release_symkey_ptr(void *ptr){
psync_ssl_free_symmetric_key((psync_symmetric_key_t)ptr);
}
static void psync_crypto_release_folder_symkey_locked(psync_folderid_t folderid, psync_symmetric_key_t key){
char buff[16];
psync_get_string_id(buff, "FKEY", folderid);
psync_cache_add(buff, key, PSYNC_CRYPTO_CACHE_DIR_SYM_KEY, psync_crypto_release_symkey_ptr, 2);
}
static void psync_crypto_release_file_symkey_locked(psync_fileid_t fileid, uint64_t hash, psync_symmetric_key_t key){
char buff[32];
psync_get_string_id2(buff, "DKEY", fileid, hash);
psync_cache_add(buff, key, PSYNC_CRYPTO_CACHE_FILE_SYM_KEY, psync_crypto_release_symkey_ptr, 2);
}
static psync_symmetric_key_t psync_crypto_sym_key_ver1_to_sym_key(sym_key_ver1 *v1){
psync_symmetric_key_t key;
key=(psync_symmetric_key_t)psync_locked_malloc(offsetof(psync_symmetric_key_struct_t, key)+PSYNC_AES256_KEY_SIZE+PSYNC_CRYPTO_HMAC_SHA512_KEY_LEN);
key->keylen=PSYNC_AES256_KEY_SIZE+PSYNC_CRYPTO_HMAC_SHA512_KEY_LEN;
memcpy(key->key, v1->aeskey, PSYNC_AES256_KEY_SIZE);
memcpy(key->key+PSYNC_AES256_KEY_SIZE, v1->hmackey, PSYNC_CRYPTO_HMAC_SHA512_KEY_LEN);
return key;
}
static psync_crypto_aes256_text_encoder_t psync_crypto_get_folder_encoder_locked(psync_folderid_t folderid){
psync_crypto_aes256_text_encoder_t enc;
psync_symmetric_key_t symkey, realkey;
sym_key_ver1 *skv1;
symkey=psync_crypto_get_folder_symkey_locked(folderid);
if (psync_crypto_is_error(symkey))
return (psync_crypto_aes256_text_encoder_t)symkey;
skv1=(sym_key_ver1 *)symkey->key;
switch (skv1->type){
case PSYNC_CRYPTO_SYM_AES256_1024BIT_HMAC:
if (symkey->keylen!=sizeof(sym_key_ver1)){
debug(D_WARNING, "bad size of decrypted key, expected %lu got %lu", (unsigned long)sizeof(sym_key_ver1), (unsigned long)symkey->keylen);
goto def1;
}
if ((skv1->flags&PSYNC_CRYPTO_SYM_FLAG_ISDIR)==0){
debug(D_WARNING, "file key found when folder key was expected for folderid %lu", (unsigned long)folderid);
goto def1;
}
realkey=psync_crypto_sym_key_ver1_to_sym_key(skv1);
psync_crypto_release_folder_symkey_locked(folderid, symkey);
enc=psync_crypto_aes256_text_encoder_create(realkey);
psync_ssl_free_symmetric_key(realkey);
return enc;
default:
debug(D_WARNING, "unkown key type %u", (unsigned)skv1->type);
def1:
psync_ssl_free_symmetric_key(symkey);
return (psync_crypto_aes256_text_encoder_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_INVALID_KEY));
}
}
static psync_crypto_aes256_text_encoder_t psync_crypto_get_folder_encoder_check_cache_locked(psync_folderid_t folderid){
char buff[16];
psync_crypto_aes256_text_encoder_t enc;
psync_get_string_id(buff, "FLDE", folderid);
enc=(psync_crypto_aes256_text_encoder_t)psync_cache_get(buff);
if (enc)
return enc;
else
return psync_crypto_get_folder_encoder_locked(folderid);
}
static psync_crypto_aes256_text_decoder_t psync_crypto_get_folder_decoder_locked(psync_folderid_t folderid){
psync_crypto_aes256_text_decoder_t dec;
psync_symmetric_key_t symkey, realkey;
sym_key_ver1 *skv1;
symkey=psync_crypto_get_folder_symkey_locked(folderid);
if (psync_crypto_is_error(symkey))
return (psync_crypto_aes256_text_encoder_t)symkey;
skv1=(sym_key_ver1 *)symkey->key;
switch (skv1->type){
case PSYNC_CRYPTO_SYM_AES256_1024BIT_HMAC:
if (symkey->keylen!=sizeof(sym_key_ver1)){
debug(D_WARNING, "bad size of decrypted key, expected %lu got %lu", (unsigned long)sizeof(sym_key_ver1), (unsigned long)symkey->keylen);
goto def1;
}
realkey=psync_crypto_sym_key_ver1_to_sym_key(skv1);
psync_crypto_release_folder_symkey_locked(folderid, symkey);
dec=psync_crypto_aes256_text_decoder_create(realkey);
psync_ssl_free_symmetric_key(realkey);
return dec;
default:
debug(D_WARNING, "unkown key type %u", (unsigned)skv1->type);
def1:
psync_ssl_free_symmetric_key(symkey);
return (psync_crypto_aes256_text_decoder_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_INVALID_KEY));
}
}
static psync_crypto_aes256_text_encoder_t psync_crypto_get_temp_folder_encoder_locked(psync_fsfolderid_t folderid){
psync_crypto_aes256_text_encoder_t enc;
psync_symmetric_key_t symkey, realkey;
sym_key_ver1 *skv1;
psync_sql_res *res;
psync_variant_row row;
res=psync_sql_query_rdlock("SELECT text2 FROM fstask WHERE id=?");
psync_sql_bind_uint(res, 1, -folderid);
if ((row=psync_sql_fetch_row(res))){
const unsigned char *b64enckey;
unsigned char *enckey;
size_t b64enckeylen, enckeylen;;
if (psync_is_null(row[0])){
psync_sql_free_result(res);
return (psync_crypto_aes256_text_encoder_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_FOLDER_NOT_ENCRYPTED));
}
b64enckey=(const unsigned char *)psync_get_lstring(row[0], &b64enckeylen);
enckey=psync_base64_decode(b64enckey, b64enckeylen, &enckeylen);
psync_sql_free_result(res);
if (enckey){
symkey=psync_ssl_rsa_decrypt_data(crypto_privkey, enckey, enckeylen);
psync_free(enckey);
}
else
symkey=PSYNC_INVALID_SYM_KEY;
}
else{
psync_sql_free_result(res);
return (psync_crypto_aes256_text_encoder_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_FOLDER_NOT_FOUND));
}
if (symkey==PSYNC_INVALID_SYM_KEY)
return (psync_crypto_aes256_text_encoder_t)err_to_ptr(PRINT_RETURN_CONST(PSYNC_CRYPTO_INVALID_KEY));
skv1=(sym_key_ver1 *)symkey->key;