+/* 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 <unistd.h>
+#include <crypto_scrypt.h>
#include "config.h"
+#include "configuration.h"
+#include "database.h"
#include "auth.h"
+#include "util.h"
+#include "md5.h"
int auth_set_password(const char *username, const char *password) {
- char filename[512];
- int fd;
+ char filename[FILENAME_MAX];
+ uint8_t pwhash[SCRYPT_OUTPUT_SIZE];
+ uint8_t salt[SCRYPT_SALT_SIZE];
+ int fd, n, r;
+
+ if (!valid_name(username) || !blerg_exists(username))
+ return 0;
- if (!blerg_exists(username))
+ n = strlen(password);
+ if (n > MAX_PASSWORD_LENGTH)
return 0;
- snprintf(filename, 512, "%s/%s/password", DATA_PATH, 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((const uint8_t *)password, n, salt, SCRYPT_SALT_SIZE, SCRYPT_N, SCRYPT_r, SCRYPT_p, pwhash, SCRYPT_OUTPUT_SIZE);
+ if (r != 0) {
+ fprintf(stderr, "Failure in scrypt for %s\n", username);
+ return 0;
+ }
+
+ /* Write the password */
+ snprintf(filename, FILENAME_MAX, "%s/%s/password", blergconf.data_path, username);
+ fd = open(filename, O_WRONLY | O_CREAT, 0600);
+ write(fd, pwhash, SCRYPT_OUTPUT_SIZE);
+ close(fd);
+
+ /* Write the salt */
+ snprintf(filename, FILENAME_MAX, "%s/%s/password_salt", blergconf.data_path, username);
fd = open(filename, O_WRONLY | O_CREAT, 0600);
- write(fd, password, strlen(password));
+ write(fd, salt, SCRYPT_SALT_SIZE);
+ close(fd);
+
+ /* Mark this as a version 1 password */
+ snprintf(filename, FILENAME_MAX, "%s/%s/password_version", blergconf.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[FILENAME_MAX];
+ int fd;
+ char str[4];
+ int len = 0;
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/password_version", blergconf.data_path, username);
+ if (access(filename, F_OK) != 0) {
+ return 0;
+ }
+
+ fd = open(filename, O_RDONLY);
+ if (fd == -1)
+ return -1;
+ len = read(fd, str, 4);
+ close(fd);
+
+ if (len < -1) {
+ perror("auth_get_password_version");
+ return -1;
+ }
+
+ str[len] = 0;
+
+ /* 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];
+ char filename[FILENAME_MAX];
int fd;
+ int read_size;
int len = 0;
- sprintf(filename, "%s/%s/password", DATA_PATH, username);
+ if (!valid_name(username))
+ return 0;
+
+ switch(auth_get_password_version(username)) {
+ case 0:
+ read_size = MD5_DIGEST_SIZE;
+ break;
+ case 1:
+ read_size = SCRYPT_OUTPUT_SIZE;
+ break;
+ default:
+ return 0;
+ }
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/password", blergconf.data_path, username);
fd = open(filename, O_RDONLY);
if (fd == -1)
return 0;
- len = read(fd, password, 32);
+ len = read(fd, password, read_size);
close(fd);
+ if (len < 0) {
+ perror("auth_get_password");
+ return 0;
+ } else if (len < read_size) {
+ fprintf(stderr, "Short read getting password\n");
+ return 0;
+ }
+
password[len] = 0;
return 1;
}
-int auth_check_password(const char *username, const char *password) {
- char epw[33];
+int auth_get_salt(const char *username, uint8_t *salt) {
+ char filename[FILENAME_MAX];
+ int fd;
+ int len = 0;
+
+ if (!valid_name(username))
+ return 0;
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/password_salt", blergconf.data_path, username);
+ fd = open(filename, O_RDONLY);
+ if (fd == -1)
+ return 0;
+ len = read(fd, salt, SCRYPT_SALT_SIZE);
+ close(fd);
+
+ if (len < 0) {
+ perror("auth_get_salt");
+ return 0;
+ } else if (len < SCRYPT_SALT_SIZE) {
+ fprintf(stderr, "Short read getting salt\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+int auth_check_password_v0(const char *username, const char *password) {
+ char epw[MD5_DIGEST_SIZE + 1];
+ char givenpw[MD5_DIGEST_SIZE];
+ struct MD5Context ctx;
if (auth_get_password(username, epw) == 0)
return 0;
- if (strncmp(password, epw, 32) == 0)
+ MD5Init(&ctx);
+ MD5Update(&ctx, username, strlen(username));
+ MD5Update(&ctx, password, strlen(password));
+ MD5Final((unsigned char *)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];
+ uint8_t esalt[SCRYPT_SALT_SIZE];
+ unsigned char givenpw[SCRYPT_OUTPUT_SIZE];
+ int r;
+
+ if (auth_get_password(username, (char *)epw) == 0)
+ return 0;
+
+ if (auth_get_salt(username, esalt) == 0)
+ return 0;
+
+ r = crypto_scrypt((const uint8_t *)password, strlen(password), esalt, SCRYPT_SALT_SIZE, SCRYPT_N, SCRYPT_r, SCRYPT_p, givenpw, SCRYPT_OUTPUT_SIZE);
+ if (r != 0) {
+ fprintf(stderr, "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);
+ }
+ fprintf(stderr, "auth_check_password fell through. Bad password version?\n");
+ return 0;
+}
+
+void hexify(char *dst, char *src, int len) {
+ static char hex[] = "0123456789abcdef";
+ int i;
+
+ for (i = 0; i < len; i++) {
+ dst[i * 2] = hex[(src[i] & 0xF0) >> 4];
+ dst[i * 2 + 1] = hex[src[i] & 0xF];
+ }
+}
+
+char *create_random_token() {
+ char buf[TOKEN_SIZE];
+ char *token;
+ int rand_fd;
+
+ rand_fd = open("/dev/urandom", O_RDONLY);
+ if (rand_fd == -1) {
+ perror("Could not open /dev/urandom\n");
+ return 0;
+ }
+ read(rand_fd, buf, TOKEN_SIZE);
+ close(rand_fd);
+
+ token = malloc(TOKEN_SIZE * 2 + 1);
+ hexify(token, buf, TOKEN_SIZE);
+ token[TOKEN_SIZE * 2] = 0;
+
+ return token;
+}
+
+char * auth_login(const char *username, const char *password) {
+ char filename[FILENAME_MAX];
+ int token_fd;
+
+ if (!auth_check_password(username, password))
+ return NULL;
+
+ char *token = create_random_token();
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens", blergconf.data_path, username);
+ if (access(filename, F_OK) != 0) {
+ if (mkdir(filename, 0700) == -1) {
+ perror("Could not create auth token dir");
+ return NULL;
+ }
+ }
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens/%s", blergconf.data_path, username, token);
+ token_fd = open(filename, O_WRONLY | O_CREAT, 0600);
+ if (token_fd == -1) {
+ perror("Could not open token");
+ return NULL;
+ }
+ close(token_fd);
+
+ return token;
+}
+
+int auth_logout(const char *username, const char *token) {
+ char filename[FILENAME_MAX];
+
+ if (!valid_name(username))
+ return 0;
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens", blergconf.data_path, username);
+ if (access(filename, F_OK) != 0) {
+ return 0;
+ }
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens/%s", blergconf.data_path, username, token);
+ if (unlink(filename) == -1)
+ return 0;
+
+ return 1;
+}
+
+int auth_check_token(const char *username, const char *given_token) {
+ char filename[FILENAME_MAX];
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens/%s", blergconf.data_path, username, given_token);
+
+ return (access(filename, F_OK) == 0);
+}
projects / blerg.git / blobdiff