Make shared key store in database

Makefile

@@ -25,7 +25,7 @@ all: $(SERVER) $(CLIENT)
 
 $(SERVER): $(SERVERSRC) $(LIBSRC)
 	mkdir -p bin
-	$(CC) $(SERVERSRC) $(LIBSRC) $(INCLUDE) -o bin/$@ $(CFLAGS) $(LDFLAGS)
+	$(CC) $(SERVERSRC) $(LIBSRC) $(INCLUDE) -DUSERNAME=\"$(username)\" -o bin/$@ $(CFLAGS) $(LDFLAGS)
 
 $(CLIENT): $(CLIENTSRC) $(LIBSRC)
 	mkdir -p bin

include/client/db.h

@@ -3,6 +3,9 @@
 
 #include <sqlite3.h>
 
-int sqlite_init();
+void get_users();
+uint8_t *get_sharedkey(uint8_t *username);
+void save_sharedkey(uint8_t *username, uint8_t *shared_key);
+void sqlite_init();
 
 #endif

include/key.h

@@ -29,5 +29,6 @@ typedef struct keypair_t {
 
 keypair_t *create_keypair(char *username);
 keypair_t *get_keypair(char *username);
+uint8_t *get_pk_from_ks(char *username);
 
 #endif

include/util.h

@@ -10,7 +10,7 @@ void error(int fatal, const char *fmt, ...);
 void *memalloc(size_t size);
 void *estrdup(void *str);
 char *replace_home(char *str);
-void mkdir_p(const char *destdir);
+void mkdir_p(const char *file);
 void write_log(int type, const char *fmt, ...);
 void print_bin(const unsigned char *ptr, size_t length);
 

src/lib/key.c

@@ -32,16 +32,25 @@ keypair_t *create_keypair(char *username)
 	memcpy(pk, pk_data, PK_DATA_SIZE);
 	memcpy(pk + PK_DATA_SIZE, pk_sign, SIGN_SIZE);
 
-	/* USE DB INSTEAD OF FILES */
+	char keyf_path[PATH_MAX];
-	char pk_path[PATH_MAX], sk_path[PATH_MAX];
+	char *data_dir = replace_home(CLIENT_DATA_DIR);
-	sprintf(pk_path, "/home/night/%s_pk", username);
+	snprintf(keyf_path, PATH_MAX, "%s/%s/keys", data_dir, USERNAME);
-	sprintf(sk_path, "/home/night/%s_sk", username);
+	free(data_dir);
-	FILE *pkf = fopen(pk_path, "w+");
+
-	FILE *skf = fopen(sk_path, "w+");
+	if (access(keyf_path, W_OK) != 0) {
-	fwrite(pk, 1, PK_SIZE, pkf);
+		/* If data file doesn't exist, most likely data dir won't exist too */
-	fwrite(sk, 1, SK_SIZE, skf);
+		mkdir_p(keyf_path);
-	fclose(pkf);
+	}
-	fclose(skf);
+
+	FILE *keyf = fopen(keyf_path, "w+");
+	if (!keyf) {
+		error(1, "Error opening key file to write");
+		return NULL;
+	}
+	/* Write key to file */
+	fwrite(pk, 1, PK_SIZE, keyf);
+	fwrite(sk, 1, SK_SIZE, keyf);
+	fclose(keyf);
 
 	keypair_t *kp = memalloc(sizeof(keypair_t));
 	memcpy(kp->pk.raw, pk_raw, PK_RAW_SIZE);
@@ -51,29 +60,35 @@ keypair_t *create_keypair(char *username)
 	memcpy(kp->pk.full, pk, PK_SIZE);
 
 	memcpy(kp->sk, sk, SK_SIZE);
+	write_log(LOG_INFO, "Created key pair");
 
 	return kp;
 }
 
 keypair_t *get_keypair(char *username)
 {
-	/* REPLACE WITH DB */
+	char keyf_path[PATH_MAX];
-    char pk_path[PATH_MAX], sk_path[PATH_MAX];
+	char *data_dir = replace_home(CLIENT_DATA_DIR);
-    sprintf(pk_path, "/home/night/%s_pk", username);
+	snprintf(keyf_path, PATH_MAX, "%s/%s/keys", data_dir, USERNAME);
-    sprintf(sk_path, "/home/night/%s_sk", username);
+	free(data_dir);
-    FILE *pkf = fopen(pk_path, "r");
+
-    FILE *skf = fopen(sk_path, "r");
+	if (access(keyf_path, W_OK) != 0) {
-    if (!pkf || !skf) {
+		/* If data file doesn't exist, most likely data dir won't exist too */
+		mkdir_p(keyf_path);
+		/* Create key pair as file doesn't exist */
 		create_keypair(username);
-        printf("Error opening key files.\n");
+	}
+
+    FILE *keyf = fopen(keyf_path, "r");
+    if (!keyf) {
+		error(1, "Error opening key file to read");
         return NULL;
     }
 
 	uint8_t pk[PK_SIZE], sk[SK_SIZE];
-    fread(pk, 1, PK_SIZE, pkf);
+    fread(pk, 1, PK_SIZE, keyf);
-    fread(sk, 1, SK_SIZE, skf);
+    fread(sk, 1, SK_SIZE, keyf);
-    fclose(pkf);
+    fclose(keyf);
-    fclose(skf);
 
     keypair_t *kp = memalloc(sizeof(keypair_t));
 
@@ -87,3 +102,21 @@ keypair_t *get_keypair(char *username)
 
     return kp;
 }
+
+/*
+ * Get public key from key server
+ */
+uint8_t *get_pk_from_ks(char *username)
+{
+	size_t bin_len = PK_RAW_SIZE;
+    unsigned char *bin = memalloc(bin_len);
+	/* TEMPORARY */
+	if (strcmp(username, "night") == 0) {
+		sodium_hex2bin(bin, bin_len, "e2f0287d9c23aed8404dd8ba407e7dff8abe40fa98f0b9adf74904978a5fcd50", PK_RAW_SIZE * 2, NULL, NULL, NULL);
+		return bin;
+	} else if (strcmp(username, "palanix") == 0) {
+		sodium_hex2bin(bin, bin_len, "932aee08aa338108e49f65a5c4f0eb0a08a15bf717fdf8c0ff60eefd0ea014ae", PK_RAW_SIZE * 2, NULL, NULL, NULL);
+		return bin;
+	}
+	return NULL;
+}

src/lib/packet.c

@@ -204,14 +204,14 @@ int verify_packet(packet_t *pkt, int fd)
 	memcpy(from, pkt->data, MAX_NAME);
 
 	/* TODO: replace with db operations */
-	keypair_t *kp_from = get_keypair(from);
+	uint8_t *pk = get_pk_from_ks(from);
 	
 	/* Verify data confidentiality by signature */
 	/* Verify data integrity by hash */
 	uint8_t hash[HASH_SIZE];
     crypto_generichash(hash, HASH_SIZE, pkt->data, pkt->length, NULL, 0);
 
-	if (crypto_sign_verify_detached(pkt->signature, hash, HASH_SIZE, kp_from->pk.raw) != 0) {
+	if (crypto_sign_verify_detached(pkt->signature, hash, HASH_SIZE, pk) != 0) {
 		/* Not match */
 		error(0, "Cannot verify data integrity");
 		packet_t *error_pkt = create_packet(ZSM_STA_ERROR_INTEGRITY,

src/lib/util.c

@@ -76,28 +76,38 @@ char *replace_home(char *str)
 /*
  * Recursively create directory by creating each subdirectory
  * like mkdir -p
+ * Create the parent folder(s) of given file
  */
-void mkdir_p(const char *destdir)
+void mkdir_p(const char *file)
 {
     char *path = memalloc(PATH_MAX);
     char dir_path[PATH_MAX];
+	dir_path[0] = '\0';
 
-    if (destdir[0] == '~') {
+    if (file[0] == '~') {
         char *home = getenv("HOME");
         if (home == NULL) {
 			write_log(LOG_ERROR, "$HOME not defined"); 
             return;
         }
         /* replace ~ with home */
-        snprintf(path, PATH_MAX, "%s%s", home, destdir + 1);
+        snprintf(path, PATH_MAX, "%s%s", home, file + 1);
     } else {
-        strcpy(path, destdir);
+        strcpy(path, file);
      }
 
     /* fix first / not appearing in the string */
     if (path[0] == '/')
         strcat(dir_path, "/");
 
+	/* Find last occurrence of '/' */
+	char *last_slash = strrchr(path, '/'); 
+
+	/* Remove last slash */
+    if (last_slash != NULL) {
+		path[last_slash - path] = '\0';
+	}
+
 	char *token = strtok(path, "/");
     while (token != NULL) {
         strcat(dir_path, token);
@@ -127,13 +137,13 @@ void write_log(int type, const char *fmt, ...)
     va_list args;
     va_start(args, fmt);
 
-	char *client_log = memalloc(PATH_MAX);
+	char client_log[PATH_MAX];
 	char *data_dir = replace_home(CLIENT_DATA_DIR);
-	snprintf(client_log, PATH_MAX, "%s/%s", data_dir, "zen.log");
+	snprintf(client_log, PATH_MAX, "%s/%s/zen.log", data_dir, USERNAME);
 	free(data_dir);
 	if (access(client_log, W_OK) != 0) {
 		/* If log file doesn't exist, most likely data dir won't exist too */
-		mkdir_p(CLIENT_DATA_DIR);
+		mkdir_p(client_log);
 	}
 
 	FILE *log = fopen(client_log, "a");
@@ -148,8 +158,9 @@ void write_log(int type, const char *fmt, ...)
 		strftime(time, 22, "%Y-%m-%d %H:%M:%S ", t);
 		char details[2 + type_len + 22];
 		snprintf(details, 2 + type_len + 22, "%s%s", logtype, time);
-		fprintf(log, "%s\n", details);
+		fprintf(log, "%s", details);
 		vfprintf(log, fmt, args);
+		fprintf(log, "\n");
 		fclose(log);
 	}
     va_end(args);

src/zen/db.c

@@ -5,68 +5,141 @@
 #include "client/db.h"
 #include "client/user.h"
 
-static int callback(void *ignore, int argc, char **argv, char **azColName)
+sqlite3 *db;
+char zen_db_path[PATH_MAX];
+
+static int get_users_callback(void *_, int argc, char **argv, char **col_name)
 {
+	/*
+	for(int i = 0; i < argc; i++) {
+        printf("%s = %s\n", column[i], argv[i] ? argv[i] : "NULL");
+    }
+*/
 	add_username(argv[0]);
     return 0;
 }
 
-static int get_shared_key(void *ignore, int argc, char **argv, char **column)
+void get_users()
 {
-    for(int i = 0; i < argc; i++) {
+	char *err_msg;
-        printf("%s = %s\n", column[i], argv[i] ? argv[i] : "NULL");
+	sqlite3_stmt *statement;
-    }
-    printf("\n");
-    return 0;
-}
 
-
+	if (sqlite3_open(zen_db_path, &db) != SQLITE_OK) {
-int sqlite_init()
+		error(0, "Cannot open database: %s", sqlite3_errmsg(db));
-{
-    sqlite3 *db;
-    char *err_msg = 0;
-    
-	char *zen_db = memalloc(PATH_MAX);
-	char *data_dir = replace_home(CLIENT_DATA_DIR);
-	snprintf(zen_db, PATH_MAX, "%s/%s", data_dir, "data.db");
-	free(data_dir);
-	if (access(zen_db, W_OK) != 0) {
-		/* If data file doesn't exist, most likely data dir won't exist too */
-		mkdir_p(CLIENT_DATA_DIR);
-	}
-
-    int rc = sqlite3_open(zen_db, &db);
-    
-    if (rc != SQLITE_OK) {
-        fprintf(stderr, "Cannot open database: %s\n", sqlite3_errmsg(db));
 		sqlite3_close(db);
-        return 1;
 	}
 	
-    char *users_statement = "CREATE TABLE IF NOT EXISTS Users(Username TEXT, SharedKey TEXT, Test TEXT);";
+	char *sql = "SELECT * FROM Keys;";
-    char *shared_key_statement = "SELECT * FROM Users;";
-    char *messages_statement = "CREATE TABLE IF NOT EXISTS Messages(Username TEXT, );";
-                //"INSERT INTO Users VALUES('night', 'test', '1');";
 
-    rc = sqlite3_exec(db, users_statement, 0, 0, &err_msg);
+	if (sqlite3_exec(db, sql, get_users_callback, NULL, &err_msg)
+			!= SQLITE_OK) {
+		error(0, "Failed to exec statement: %s", err_msg);
+		sqlite3_close(db);
+	}
 
-    if (rc != SQLITE_OK) {
+	sqlite3_close(db);
-        error(0, "SQL error: %s", err_msg);
+	return;
+}
+/*
+ * Get shared key betweeen username
+ */
+uint8_t *get_sharedkey(uint8_t *username)
+{
+	sqlite3_stmt *statement;
+	uint8_t *shared_key = memalloc(SHARED_KEY_SIZE);
+	/* Make all bytes be 0 */
+	memset(shared_key, 0, SHARED_KEY_SIZE);
+
+	if (sqlite3_open(zen_db_path, &db) != SQLITE_OK) {
+		error(0, "Cannot open database: %s", sqlite3_errmsg(db));
+		sqlite3_close(db);
+	}
+	
+	char *sql = "SELECT SharedKey FROM Keys WHERE Username = ?;";
+
+	if (sqlite3_prepare_v2(db, sql, -1, &statement, NULL) != SQLITE_OK) {
+		error(0, "Failed to prepare statement: %s", sqlite3_errmsg(db));
+		sqlite3_close(db);
+	}
+
+	sqlite3_bind_text(statement, 1, username, strlen(username), SQLITE_STATIC);
+
+	if (sqlite3_step(statement) == SQLITE_ROW) {
+		const void *blob = sqlite3_column_blob(statement, 0);
+		memcpy(shared_key, blob, SHARED_KEY_SIZE);
+	} else {
+		free(shared_key);
+		/* Set it to NULL so it can be returned */
+		shared_key = NULL;
+	}
+
+	sqlite3_finalize(statement);
+	sqlite3_close(db);
+	return shared_key;
+}
+
+/*
+ * Saved shared key with username to database
+ */
+void save_sharedkey(uint8_t *username, uint8_t *shared_key)
+{
+	if (sqlite3_open(zen_db_path, &db) != SQLITE_OK) {
+		error(0, "Cannot open database: %s", sqlite3_errmsg(db));
+		sqlite3_close(db);
+	}
+	
+	sqlite3_stmt *statement;
+
+	/* Statement to execute with values to be replaced */
+	char *sql = "INSERT OR REPLACE INTO Keys (Username,SharedKey)"
+		"VALUES (?,?);";
+	printf("in db\n");
+	print_bin(shared_key, SHARED_KEY_SIZE);
+	if (sqlite3_prepare_v2(db, sql, -1, &statement, NULL) != SQLITE_OK) {
+		error(0, "Failed to prepare statement: %s", sqlite3_errmsg(db));
+		sqlite3_close(db);
+	}
+	sqlite3_bind_text(statement, 1, username, strlen(username), SQLITE_STATIC);
+    sqlite3_bind_blob(statement, 2, shared_key, SHARED_KEY_SIZE, SQLITE_STATIC);
+
+	if (sqlite3_step(statement) != SQLITE_DONE) {
+		error(0, "Failed to execute statement");
+		sqlite3_close(db);
+	}
+	sqlite3_finalize(statement);
+	sqlite3_close(db);
+	write_log(LOG_INFO, "Saved shared key with %s to database", username);
+}
+
+void sqlite_init()
+{
+	char *err_msg;
+
+	char *data_dir = replace_home(CLIENT_DATA_DIR);
+	snprintf(zen_db_path, PATH_MAX, "%s/%s/data.db", data_dir, USERNAME);
+	free(data_dir);
+	if (access(zen_db_path, W_OK) != 0) {
+		/* If data file doesn't exist, most likely data dir won't exist too */
+		mkdir_p(zen_db_path);
+	}
+
+	if (sqlite3_open(zen_db_path, &db) != SQLITE_OK) {
+		deinit();
+		error(1, "Cannot open database: %s", sqlite3_errmsg(db));
+		sqlite3_close(db);
+	}
+
+	/* Create Keys Table if it is doesn't exist with Username being id */
+	char *create_keys_table = "CREATE TABLE IF NOT EXISTS Keys("
+		"Username TEXT NOT NULL, SharedKey BLOB NOT NULL,"
+		"PRIMARY KEY(Username));";
+
+    if (sqlite3_exec(db, create_keys_table, 0, 0, &err_msg) != SQLITE_OK) {
+        error(0, "Cannot create Keys table: %s", err_msg);
         sqlite3_free(err_msg);        
     } else {
-/*         error(0, "Table created successfully"); */
+		write_log(LOG_INFO, "Keys Table created successfully");
-    }
-
-    // Select and print all entries
-    rc = sqlite3_exec(db, "SELECT * FROM Users", callback, NULL, &err_msg);
-    
-    if (rc != SQLITE_OK) {
-        error(0, "SQL error: %s\n", err_msg);
-        sqlite3_free(err_msg);        
     }
 	
 	sqlite3_close(db);
-    
-    return 0;
 }
-