Saving and loading of key database works

We now can save and load the database from a file and also add hosts.

editor.c

@@ -28,6 +28,7 @@
 #include <stdbool.h>
 #include "editor.h"
 #include "util.h"
+#include "keydb.h"
 
 #define MAX_COMMAND_ALIAS_COUNT			2
 
@@ -40,6 +41,7 @@ enum cmd_returncode_t {
 
 struct editor_context_t {
 	bool running;
+	struct keydb_t *keydb;
 };
 
 struct editor_command_t {
@@ -158,7 +160,11 @@ static enum cmd_returncode_t cmd_help(struct editor_context_t *ctx, const char *
 }
 
 static enum cmd_returncode_t cmd_new(struct editor_context_t *ctx, const char *cmdname, unsigned int param_cnt, char **params) {
-	return COMMAND_SUCCESS;
+	if (ctx->keydb) {
+		keydb_free(ctx->keydb);
+	}
+	ctx->keydb = keydb_new();
+	return (ctx->keydb != NULL) ? COMMAND_SUCCESS : COMMAND_FAILURE;
 }
 
 static enum cmd_returncode_t cmd_list(struct editor_context_t *ctx, const char *cmdname, unsigned int param_cnt, char **params) {
@@ -166,7 +172,17 @@ static enum cmd_returncode_t cmd_list(struct editor_context_t *ctx, const char *
 }
 
 static enum cmd_returncode_t cmd_add_host(struct editor_context_t *ctx, const char *cmdname, unsigned int param_cnt, char **params) {
-	return COMMAND_SUCCESS;
+	if (!ctx->keydb) {
+		ctx->keydb = keydb_new();
+		if (!ctx->keydb) {
+			return COMMAND_FAILURE;
+		}
+	}
+	struct keydb_t *new_keydb = keydb_add_host(ctx->keydb, params[0]);
+	if (new_keydb) {
+		ctx->keydb = new_keydb;
+	}
+	return new_keydb ? COMMAND_SUCCESS : COMMAND_FAILURE;
 }
 
 static enum cmd_returncode_t cmd_add_volume(struct editor_context_t *ctx, const char *cmdname, unsigned int param_cnt, char **params) {
@@ -182,11 +198,20 @@ static enum cmd_returncode_t cmd_showkey_volume(struct editor_context_t *ctx, co
 }
 
 static enum cmd_returncode_t cmd_open(struct editor_context_t *ctx, const char *cmdname, unsigned int param_cnt, char **params) {
-	return COMMAND_SUCCESS;
+	if (ctx->keydb) {
+		keydb_free(ctx->keydb);
+	}
+	ctx->keydb = keydb_read(params[0]);
+	return (ctx->keydb != NULL) ? COMMAND_SUCCESS : COMMAND_FAILURE;
 }
 
 static enum cmd_returncode_t cmd_save(struct editor_context_t *ctx, const char *cmdname, unsigned int param_cnt, char **params) {
-	return COMMAND_SUCCESS;
+	if (!ctx->keydb) {
+		fprintf(stderr, "No key database loaded.\n");
+		return COMMAND_FAILURE;
+	}
+	bool success = keydb_write(ctx->keydb, params[0], "foobar");
+	return success ? COMMAND_SUCCESS : COMMAND_FAILURE;
 }
 
 static const struct editor_command_t *find_command(const char *command_name) {
@@ -275,6 +300,10 @@ void editor_start(void) {
 			}
 		}
 	}
+
+	if (editor_context.keydb) {
+		keydb_free(editor_context.keydb);
+	}
 }
 
 #ifndef __TEST_EDITOR__

file_encryption.c

@@ -423,6 +423,7 @@ bool write_encrypted_file(const char *filename, const void *plaintext, unsigned
 	if (RAND_bytes(encrypted_file->iv, ENCRYPTED_FILE_IV_SIZE) != 1) {
 		log_openssl(LLVL_FATAL, "Failed to get entropy from RAND_bytes for IV");
 		OPENSSL_cleanse(&key, sizeof(key));
+		free(encrypted_file);
 		return false;
 	}
 
@@ -430,6 +431,7 @@ bool write_encrypted_file(const char *filename, const void *plaintext, unsigned
 	if (!encrypt_aes256_gcm(plaintext, plaintext_length, key.key, encrypted_file->iv, encrypted_file->ciphertext, encrypted_file->auth_tag)) {
 		log_libc(LLVL_FATAL, "encryption failed");
 		OPENSSL_cleanse(&key, sizeof(key));
+		free(encrypted_file);
 		return false;
 	}
 
@@ -451,5 +453,6 @@ bool write_encrypted_file(const char *filename, const void *plaintext, unsigned
 		return false;
 	}
 
+	free(encrypted_file);
 	return success;
 }

keydb.c

@@ -25,18 +25,25 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
+#include <openssl/crypto.h>
 
 #include "keydb.h"
 #include "util.h"
+#include "log.h"
 
-unsigned int keydb_getsize(const struct keydb_t *keydb) {
+static unsigned int keydb_getsize_hostcount(unsigned int host_count) {
-	return sizeof(struct keydb_t) + (keydb->host_count * sizeof(struct host_entry_t));
+	return sizeof(struct keydb_t) + (host_count * sizeof(struct host_entry_t));
 }
 
-void keydb_init(struct keydb_t *keydb) {
+static unsigned int keydb_getsize(const struct keydb_t *keydb) {
-	memset(keydb, 0, sizeof(struct keydb_t));
+	return keydb_getsize_hostcount(keydb->host_count);
+}
+
+struct keydb_t* keydb_new(void) {
+	struct keydb_t *keydb = calloc(sizeof(struct keydb_t), 1);
 	keydb->keydb_version = KEYDB_VERSION;
 	keydb->server_database = true;
+	return keydb;
 }
 
 void keydb_free(struct keydb_t *keydb) {
@@ -44,10 +51,48 @@ void keydb_free(struct keydb_t *keydb) {
 	free(keydb);
 }
 
-void keydb_write(const struct keydb_t *keydb, const char *filename, const char *passphrase, enum kdf_t kdf) {
+struct keydb_t* keydb_add_host(struct keydb_t *keydb, const char *hostname) {
+	struct keydb_t *new_keydb = realloc(keydb, keydb_getsize_hostcount(keydb->host_count + 1));
+	if (!new_keydb) {
+		return NULL;
+	}
 
+	memset(&new_keydb->hosts[new_keydb->host_count], 0, sizeof(struct host_entry_t));
+	new_keydb->host_count++;
+	return new_keydb;
+}
+
+bool keydb_write(const struct keydb_t *keydb, const char *filename, const char *passphrase) {
+	enum kdf_t kdf;
+	if ((!passphrase) || (strlen(passphrase) == 0)) {
+		/* For empty password, we can also use garbage KDF */
+		kdf = KDF_PBKDF2_SHA256_1000;
+	} else {
+		kdf = KDF_SCRYPT_N17_r8_p1;
+	}
+	return write_encrypted_file(filename, keydb, keydb_getsize(keydb), passphrase, kdf);
 }
 
 struct keydb_t* keydb_read(const char *filename) {
-	return NULL;
+	struct decrypted_file_t decrypted_file = read_encrypted_file(filename);
+	if (!decrypted_file.success) {
+		return NULL;
+	}
+
+	struct keydb_t *keydb = (struct keydb_t*)decrypted_file.data;
+	if (keydb->keydb_version != KEYDB_VERSION) {
+		log_msg(LLVL_ERROR, "keydb in %s could be read, but is of version %u (we expected %u).\n", keydb->keydb_version, KEYDB_VERSION);
+		OPENSSL_cleanse(decrypted_file.data, decrypted_file.data_length);
+		free(decrypted_file.data);
+		return NULL;
+	}
+
+	if (decrypted_file.data_length != keydb_getsize(keydb)) {
+		log_msg(LLVL_ERROR, "keydb in %s could be read, but was %u bytes long (we expected %u).\n", decrypted_file.data_length, keydb_getsize(keydb));
+		OPENSSL_cleanse(decrypted_file.data, decrypted_file.data_length);
+		free(decrypted_file.data);
+		return NULL;
+	}
+
+	return keydb;
 }

keydb.h

@@ -55,10 +55,10 @@ struct keydb_t {
 };
 
 /*************** AUTO GENERATED SECTION FOLLOWS ***************/
-unsigned int keydb_getsize(const struct keydb_t *keydb);
+struct keydb_t* keydb_new(void);
-void keydb_init(struct keydb_t *keydb);
 void keydb_free(struct keydb_t *keydb);
-void keydb_write(const struct keydb_t *keydb, const char *filename, const char *passphrase, enum kdf_t kdf);
+struct keydb_t* keydb_add_host(struct keydb_t *keydb, const char *hostname);
+bool keydb_write(const struct keydb_t *keydb, const char *filename, const char *passphrase);
 struct keydb_t* keydb_read(const char *filename);
 /***************  AUTO GENERATED SECTION ENDS   ***************/