Georg/luksrku
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Server implementation seems to work

Browse Source 
Rudimentary functionality of server (not including responding to
announcements over UDP) is working now.
This commit is contained in:
Johannes Bauer 2019-10-23 15:56:06 +02:00
parent 3e5c7d541c
commit 603e63876f
4 changed files with 44 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
editor.c
View File

@ -449,7 +449,7 @@ static enum cmd_returncode_t cmd_rawdump(struct editor_context_t *ctx, const cha
fprintf(stderr, " Host %d / Volume %d:\n", i, j); fprintf(stderr, " Host %d / Volume %d:\n", i, j);
dump_hexline(stderr, " volume_uuid ", volume->volume_uuid, sizeof(volume->volume_uuid), false); dump_hexline(stderr, " volume_uuid ", volume->volume_uuid, sizeof(volume->volume_uuid), false);
dump_hexline(stderr, " devmapper_name ", volume->devmapper_name, sizeof(volume->devmapper_name), true); dump_hexline(stderr, " devmapper_name ", volume->devmapper_name, sizeof(volume->devmapper_name), true);
dump_hexline(stderr, " luks_passphrase ", volume->luks_passphrase, sizeof(volume->luks_passphrase), false); dump_hexline(stderr, " luks_passphrase ", volume->luks_passphrase_raw, sizeof(volume->luks_passphrase_raw), false);
} }
} }
} }

10
keydb.c
View File

@ -67,7 +67,7 @@ struct keydb_t* keydb_export_public(struct host_entry_t *host) {
/* But remove all LUKS passphrases of course, this is for the luksrku client */ /* But remove all LUKS passphrases of course, this is for the luksrku client */
for (unsigned int i = 0; i < host->volume_count; i++) { for (unsigned int i = 0; i < host->volume_count; i++) {
struct volume_entry_t *volume = &public_host->volumes[i]; struct volume_entry_t *volume = &public_host->volumes[i];
memset(volume->luks_passphrase, 0, sizeof(volume->luks_passphrase)); memset(volume->luks_passphrase_raw, 0, sizeof(volume->luks_passphrase_raw));
} }
return public_db; return public_db;
@ -188,8 +188,8 @@ struct volume_entry_t* keydb_add_volume(struct host_entry_t *host, const char *d
struct volume_entry_t *volume = &host->volumes[host->volume_count]; struct volume_entry_t *volume = &host->volumes[host->volume_count];
memcpy(volume->volume_uuid, volume_uuid, 16); memcpy(volume->volume_uuid, volume_uuid, 16);
strncpy(volume->devmapper_name, devmapper_name, sizeof(volume->devmapper_name) - 1); strncpy(volume->devmapper_name, devmapper_name, sizeof(volume->devmapper_name) - 1);
if (!buffer_randomize(volume->luks_passphrase, sizeof(volume->luks_passphrase))) { if (!buffer_randomize(volume->luks_passphrase_raw, sizeof(volume->luks_passphrase_raw))) {
log_msg(LLVL_ERROR, "Failed to produce %d bytes of entropy for LUKS passphrase.", sizeof(volume->luks_passphrase)); log_msg(LLVL_ERROR, "Failed to produce %d bytes of entropy for LUKS passphrase.", sizeof(volume->luks_passphrase_raw));
return NULL; return NULL;
} }
host->volume_count++; host->volume_count++;
@ -211,11 +211,11 @@ bool keydb_del_volume(struct host_entry_t *host, const char *devmapper_name) {
} }
bool keydb_rekey_volume(struct volume_entry_t *volume) { bool keydb_rekey_volume(struct volume_entry_t *volume) {
return buffer_randomize(volume->luks_passphrase, sizeof(volume->luks_passphrase)); return buffer_randomize(volume->luks_passphrase_raw, sizeof(volume->luks_passphrase_raw));
} }
bool keydb_get_volume_luks_passphrase(const struct volume_entry_t *volume, char *dest, unsigned int dest_buffer_size) { bool keydb_get_volume_luks_passphrase(const struct volume_entry_t *volume, char *dest, unsigned int dest_buffer_size) {
return ascii_encode(dest, dest_buffer_size, volume->luks_passphrase, sizeof(volume->luks_passphrase)); return ascii_encode(dest, dest_buffer_size, volume->luks_passphrase_raw, sizeof(volume->luks_passphrase_raw));
} }
bool keydb_write(const struct keydb_t *keydb, const char *filename, const char *passphrase) { bool keydb_write(const struct keydb_t *keydb, const char *filename, const char *passphrase) {

2
keydb.h
View File

@ -35,7 +35,7 @@
struct volume_entry_t { struct volume_entry_t {
uint8_t volume_uuid[16]; /* UUID of crypt_LUKS volume */ uint8_t volume_uuid[16]; /* UUID of crypt_LUKS volume */
char devmapper_name[MAX_DEVMAPPER_NAME_LENGTH]; /* dmsetup name when unlocked. Zero-terminated string. */ char devmapper_name[MAX_DEVMAPPER_NAME_LENGTH]; /* dmsetup name when unlocked. Zero-terminated string. */
uint8_t luks_passphrase[LUKS_PASSPHRASE_RAW_SIZE_BYTES]; /* LUKS passphrase used to unlock volume; raw byte data */ uint8_t luks_passphrase_raw[LUKS_PASSPHRASE_RAW_SIZE_BYTES]; /* LUKS passphrase used to unlock volume; raw byte data */
}; };
struct host_entry_t { struct host_entry_t {

49
server.c
View File

@ -305,8 +305,16 @@ static unsigned int psk_server_callback(SSL *ssl, const char *identity, unsigned
} }
#endif #endif
struct client_ctx_t {
struct generic_tls_ctx_t *gctx;
const struct keydb_t *keydb;
const struct host_entry_t *host;
int fd;
};
static int psk_server_callback(SSL *ssl, const unsigned char *identity, size_t identity_len, SSL_SESSION **sessptr) { static int psk_server_callback(SSL *ssl, const unsigned char *identity, size_t identity_len, SSL_SESSION **sessptr) {
const struct keydb_t *keydb = (const struct keydb_t*)SSL_get_default_passwd_cb_userdata(ssl); struct client_ctx_t *ctx = (struct client_ctx_t*)SSL_get_app_data(ssl);
if (identity_len != ASCII_UUID_CHARACTER_COUNT) { if (identity_len != ASCII_UUID_CHARACTER_COUNT) {
log_msg(LLVL_WARNING, "Received client identity of length %d, cannot be a UUID.", identity_len); log_msg(LLVL_WARNING, "Received client identity of length %d, cannot be a UUID.", identity_len);
@ -327,8 +335,8 @@ static int psk_server_callback(SSL *ssl, const unsigned char *identity, size_t i
return 0; return 0;
} }
const struct host_entry_t *host = keydb_get_host_by_uuid(keydb, uuid); ctx->host = keydb_get_host_by_uuid(ctx->keydb, uuid);
if (!host) { if (!ctx->host) {
log_msg(LLVL_WARNING, "Client connected with client UUID %s, but not present in key database.", uuid_str); log_msg(LLVL_WARNING, "Client connected with client UUID %s, but not present in key database.", uuid_str);
return 0; return 0;
} }
@ -346,7 +354,7 @@ static int psk_server_callback(SSL *ssl, const unsigned char *identity, size_t i
return 0; return 0;
} }
if (!SSL_SESSION_set1_master_key(sess, (const unsigned char*)"\x00\x11\x22", 3)) { if (!SSL_SESSION_set1_master_key(sess, ctx->host->tls_psk, PSK_SIZE_BYTES)) {
log_openssl(LLVL_ERROR, "Failed to set TLSv1.3-PSK master key."); log_openssl(LLVL_ERROR, "Failed to set TLSv1.3-PSK master key.");
SSL_SESSION_free(sess); SSL_SESSION_free(sess);
return 0; return 0;
@ -368,34 +376,35 @@ static int psk_server_callback(SSL *ssl, const unsigned char *identity, size_t i
return 1; return 1;
} }
struct client_ctx_t {
struct generic_tls_ctx_t *gctx;
const struct keydb_t *keydb;
int fd;
};
static void *client_handler_thread(void *vctx) { static void *client_handler_thread(void *vctx) {
struct client_ctx_t *client = (struct client_ctx_t*)vctx; struct client_ctx_t *client = (struct client_ctx_t*)vctx;
SSL *ssl = SSL_new(client->gctx->ctx); SSL *ssl = SSL_new(client->gctx->ctx);
SSL_set_fd(ssl, client->fd); SSL_set_fd(ssl, client->fd);
SSL_set_default_passwd_cb_userdata(ssl, (void*)client->keydb); SSL_set_app_data(ssl, client);
if (SSL_accept(ssl) <= 0) { if (SSL_accept(ssl) <= 0) {
ERR_print_errors_fp(stderr); ERR_print_errors_fp(stderr);
} else { } else {
log_msg(LLVL_DEBUG, "Client connected, sending their data..."); if (client->host) {
/* log_msg(LLVL_DEBUG, "Client \"%s\" connected, sending unlock data for %d volumes...", client->host->host_name, client->host->volume_count);
while (true) { for (unsigned int i = 0; i < client->host->volume_count; i++) {
struct msg_t msg; const struct volume_entry_t *volume = &client->host->volumes[i];
int rxlen = SSL_read(ssl, &msg, sizeof(msg));
if (rxlen != sizeof(msg)) { struct msg_t msg = { 0 };
log_msg(LLVL_WARNING, "Tried to read message of %d bytes, recevied %d. Severing connection to client.", sizeof(msg), rxlen); memcpy(msg.volume_uuid, volume->volume_uuid, 16);
memcpy(msg.luks_passphrase_raw, volume->luks_passphrase_raw, LUKS_PASSPHRASE_RAW_SIZE_BYTES);
int txlen = SSL_write(ssl, &msg, sizeof(msg));
OPENSSL_cleanse(&msg, sizeof(msg));
if (txlen != sizeof(msg)) {
log_msg(LLVL_WARNING, "Tried to send message of %d bytes, but sent %d. Severing connection to client.", sizeof(msg), txlen);
break; break;
} }
} }
*/ } else {
fprintf(stderr, "done\n"); log_msg(LLVL_FATAL, "Client connected, but no host set.");
}
} }
SSL_free(ssl); SSL_free(ssl);