X-Git-Url: http://git.bytex64.net/?a=blobdiff_plain;f=common%2Fauth.c;h=6e5f346dea6be942e8c6aebd81a084cdd770a9fe;hb=46a8b671b3c707db689868d9b6544d272aa711a7;hp=01164626e9599a9e29cd9917c580028040f41b0b;hpb=a65aeec9e6152703de9c770e56e689b1356cddb0;p=blerg.git

diff --git a/common/auth.c b/common/auth.c
index 0116462..6e5f346 100644
--- a/common/auth.c
+++ b/common/auth.c
@@ -1,39 +1,105 @@
+/* Blerg is (C) 2011 The Dominion of Awesome, and is distributed under a
+ * BSD-style license.  Please see the COPYING file for details.
+ */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <crypto_scrypt.h>
 #include "config.h"
 #include "auth.h"
-
-#define TOKEN_SIZE 16
+#include "util.h"
+#include "md5.h"
 
 int auth_set_password(const char *username, const char *password) {
 	char filename[512];
-	int fd;
+	unsigned char pwhash[SCRYPT_OUTPUT_SIZE];
+	unsigned char salt[SCRYPT_SALT_SIZE];
+	int fd, n, r;
+
+	if (!valid_name(username) || !blerg_exists(username))
+		return 0;
+
+	n = strlen(password);
+	if (n > MAX_PASSWORD_LENGTH)
+		return 0;
 
-	if (!blerg_exists(username))
+	/* Gather some salt */
+	fd = open("/dev/urandom", O_RDONLY);
+	if (fd == -1) {
+		perror("Could not open /dev/urandom\n");
+		return 0;
+	}
+	read(fd, salt, SCRYPT_SALT_SIZE);
+	close(fd);
+
+	r = crypto_scrypt(password, n, salt, SCRYPT_SALT_SIZE, SCRYPT_N, SCRYPT_r, SCRYPT_p, pwhash, SCRYPT_OUTPUT_SIZE);
+	if (r != 0) {
+		printf("Failure in scrypt for %s\n", username);
 		return 0;
+	}
 
+	/* Write the password */
 	snprintf(filename, 512, "%s/%s/password", DATA_PATH, username);
 	fd = open(filename, O_WRONLY | O_CREAT, 0600);
-	write(fd, password, strlen(password));
+	write(fd, pwhash, SCRYPT_OUTPUT_SIZE);
+	close(fd);
+
+	/* Write the salt */
+	snprintf(filename, 512, "%s/%s/password_salt", DATA_PATH, username);
+	fd = open(filename, O_WRONLY | O_CREAT, 0600);
+	write(fd, salt, SCRYPT_SALT_SIZE);
+	close(fd);
+
+	/* Mark this as a version 1 password */
+	snprintf(filename, 512, "%s/%s/password_version", DATA_PATH, username);
+	fd = open(filename, O_WRONLY | O_CREAT, 0600);
+	write(fd, "1\n", 2);
 	close(fd);
 	
 	return 1;
 }
 
+int auth_get_password_version(const char *username) {
+	char filename[512];
+	int fd;
+	char str[4];
+	int version;
+
+	sprintf(filename, "%s/%s/password_version", DATA_PATH, username);
+	if (access(filename, F_OK) != 0) {
+		return 0;
+	}
+
+	fd = open(filename, O_RDONLY);
+	read(fd, str, 4);
+	close(fd);
+	/* strtol returns zero if there isn't a number */
+	return strtol(str, NULL, 10);
+}
+
 int auth_get_password(const char *username, char *password) {
 	char filename[512];
 	int fd;
 	int len = 0;
 
+	if (!valid_name(username))
+		return 0;
+
 	sprintf(filename, "%s/%s/password", DATA_PATH, username);
 	fd = open(filename, O_RDONLY);
 	if (fd == -1)
 		return 0;
-	len = read(fd, password, 32);
+	switch(auth_get_password_version(username)) {
+	case 0:
+		len = read(fd, password, MD5_DIGEST_SIZE);
+		break;
+	case 1:
+		len = read(fd, password, SCRYPT_OUTPUT_SIZE);
+		break;
+	}
 	close(fd);
 
 	password[len] = 0;
@@ -41,18 +107,84 @@ int auth_get_password(const char *username, char *password) {
 	return 1;
 }
 
-int auth_check_password(const char *username, const char *password) {
-	char epw[33];
+int auth_get_salt(const char *username, char *salt) {
+	char filename[512];
+	int fd, len;
+
+	if (!valid_name(username))
+		return 0;
+
+	sprintf(filename, "%s/%s/password_salt", DATA_PATH, username);
+	fd = open(filename, O_RDONLY);
+	if (fd == -1)
+		return 0;
+	len = read(fd, salt, SCRYPT_SALT_SIZE);
+	close(fd);
+
+	return 1;
+}
+
+int auth_check_password_v0(const char *username, const char *password) {
+	char epw[MD5_DIGEST_SIZE + 1];
+	unsigned char givenpw[MD5_DIGEST_SIZE];
+	struct MD5Context ctx;
+
+	if (auth_get_password(username, epw) == 0)
+		return 0;
+
+	MD5Init(&ctx);
+	MD5Update(&ctx, username, strlen(username));
+	MD5Update(&ctx, password, strlen(password));
+	MD5Final(givenpw, &ctx);
+
+	if (strncmp(givenpw, epw, MD5_DIGEST_SIZE) == 0)
+		return 1;
+	else
+		return 0;
+}
+
+int auth_check_password_v1(const char *username, const char *password) {
+	unsigned char epw[SCRYPT_OUTPUT_SIZE];
+	unsigned char esalt[SCRYPT_SALT_SIZE];
+	unsigned char givenpw[SCRYPT_OUTPUT_SIZE];
+	int r;
 
 	if (auth_get_password(username, epw) == 0)
 		return 0;
 
-	if (strncmp(password, epw, 32) == 0)
+	if (auth_get_salt(username, esalt) == 0)
+		return 0;
+
+	r = crypto_scrypt(password, strlen(password), esalt, SCRYPT_SALT_SIZE, SCRYPT_N, SCRYPT_r, SCRYPT_p, givenpw, SCRYPT_OUTPUT_SIZE);
+	if (r != 0) {
+		printf("Failure in scrypt for %s\n", username);
+		return 0;
+	}
+
+	if (memcmp(givenpw, epw, SCRYPT_OUTPUT_SIZE) == 0)
 		return 1;
 	else
 		return 0;
 }
 
+int auth_check_password(const char *username, const char *password) {
+	int version = auth_get_password_version(username);
+
+	switch(version) {
+	case 0:
+		if (auth_check_password_v0(username, password)) {
+			/* Refresh to the newest version */
+			auth_set_password(username, password);
+			return 1;
+		} else {
+			return 0;
+		}
+		break;
+	case 1:
+		return auth_check_password_v1(username, password);
+	}
+}
+
 void hexify(char *dst, char *src, int len) {
 	static char hex[] = "0123456789abcdef";
 	int i;
@@ -83,52 +215,56 @@ char *create_random_token() {
 	return token;
 }
 
-int auth_login(const char *username, const char *password) {
+char * auth_login(const char *username, const char *password) {
 	char filename[512];
 	int token_fd;
 
 	if (!auth_check_password(username, password))
-		return 0;
+		return NULL;
+
+	char *token = create_random_token();
+
+	sprintf(filename, "%s/%s/tokens", DATA_PATH, username);
+	if (access(filename, F_OK) != 0) {
+		if (mkdir(filename, 0700) == -1) {
+			perror("Could not create auth token dir");
+			return NULL;
+		}
+	}
 
-	sprintf(filename, "%s/%s/token", DATA_PATH, username);
+	sprintf(filename, "%s/%s/tokens/%s", DATA_PATH, username, token);
 	token_fd = open(filename, O_WRONLY | O_CREAT, 0600);
 	if (token_fd == -1) {
 		perror("Could not open token");
-		return 0;
+		return NULL;
 	}
-
-	char *token = create_random_token();
-	write(token_fd, token, TOKEN_SIZE * 2);
 	close(token_fd);
-	free(token);
 
-	return 1;
+	return token;
 }
 
-int auth_logout(const char *username) {
+int auth_logout(const char *username, const char *token) {
 	char filename[512];
-	sprintf(filename, "%s/%s/token", DATA_PATH, username);
+
+	if (!valid_name(username))
+		return 0;
+
+	sprintf(filename, "%s/%s/tokens", DATA_PATH, username);
+	if (access(filename, F_OK) != 0) {
+		return 0;
+	}
+
+	sprintf(filename, "%s/%s/tokens/%s", DATA_PATH, username, token);
 	if (unlink(filename) == -1)
 		return 0;
 
 	return 1;
 }
 
-char *auth_get_token(const char *username) {
+int auth_check_token(const char *username, const char *given_token) {
 	char filename[512];
-	char *token;
-	int token_fd;
 
-	sprintf(filename, "%s/%s/token", DATA_PATH, username);
-	token_fd = open(filename, O_RDONLY, 0600);
-	if (token_fd == -1) {
-		perror("Could not open token");
-		return NULL;
-	}
+	sprintf(filename, "%s/%s/tokens/%s", DATA_PATH, username, given_token);
 
-	token = malloc(TOKEN_SIZE * 2 + 1);
-	read(token_fd, token, TOKEN_SIZE * 2);
-	close(token_fd);
-
-	return token;
+	return (access(filename, F_OK) == 0);
 }