+/* 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/file.h>
#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"
-
-#define TOKEN_SIZE 16
+#include "util.h"
+#include "stringring.h"
+#include "md5.h"
int auth_set_password(const char *username, const char *password) {
- char filename[512];
- int fd;
+ char filename[FILENAME_MAX];
+ struct auth_v2 auth;
+ int fd, n, r;
+
+ if (!valid_name(username) || !blerg_exists(username))
+ return 0;
+
+ n = strlen(password);
+ if (n > MAX_PASSWORD_LENGTH)
+ return 0;
+
+ /* Clear the auth structure */
+ memset(&auth, 0, sizeof(struct auth_v2));
+
+ /* Set the auth version */
+ auth.header.version = 2;
+
+ /* Gather some salt */
+ fd = open("/dev/urandom", O_RDONLY);
+ if (fd == -1) {
+ perror("Could not open /dev/urandom");
+ return 0;
+ }
+ read(fd, auth.salt, SCRYPT_SALT_SIZE);
+ close(fd);
- if (!blerg_exists(username))
+ r = crypto_scrypt((const uint8_t *)password, n, auth.salt, SCRYPT_SALT_SIZE, SCRYPT_N, SCRYPT_r, SCRYPT_p, auth.password, SCRYPT_OUTPUT_SIZE);
+ if (r != 0) {
+ fprintf(stderr, "Failure in scrypt for %s\n", username);
return 0;
+ }
- snprintf(filename, 512, "%s/%s/password", DATA_PATH, username);
+ /* Write the data */
+ snprintf(filename, FILENAME_MAX, "%s/%s/auth", blergconf.data_path, username);
fd = open(filename, O_WRONLY | O_CREAT, 0600);
- write(fd, password, strlen(password));
+ flock(fd, LOCK_EX);
+ write(fd, &auth, sizeof(struct auth_v2));
+ flock(fd, LOCK_UN);
close(fd);
-
+
return 1;
}
+int auth_get_password_version(const char *username) {
+ char filename[FILENAME_MAX];
+ int fd;
+ char str[4];
+ struct auth_header ah;
+ int len = 0;
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/auth", blergconf.data_path, username);
+ if (access(filename, F_OK) == 0) {
+ fd = open(filename, O_RDONLY);
+ if (fd == -1)
+ return -1;
+ len = read(fd, &ah, sizeof(struct auth_header));
+ close(fd);
+
+ if (len < 0) {
+ perror("reading auth file");
+ return -1;
+ } else if (len < sizeof(struct auth_header)) {
+ fprintf(stderr, "Short read on while determining auth version for %s", username);
+ return -1;
+ }
+
+ return ah.version;
+ }
+
+ 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 < 0) {
+ 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_get_data(const char *username, void *data, size_t data_len) {
+ char filename[FILENAME_MAX];
+ int fd;
+ int len = 0;
+
+ if (!valid_name(username))
+ return 0;
+
+ snprintf(filename, FILENAME_MAX, "%s/%s/auth", blergconf.data_path, username);
+ fd = open(filename, O_RDONLY);
+ if (fd == -1)
+ return 0;
+ flock(fd, LOCK_SH);
+ len = read(fd, data, data_len);
+ flock(fd, LOCK_UN);
+ close(fd);
+
+ if (len < 0) {
+ perror("auth_get_data");
+ return 0;
+ } else if (len < data_len) {
+ fprintf(stderr, "Short read getting auth data\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+int auth_check_scrypt(struct auth_v2 *auth, const char *username, const char *password) {
+ unsigned char givenpw[SCRYPT_OUTPUT_SIZE];
+ int r;
+
+ r = crypto_scrypt((const uint8_t *)password, strlen(password), auth->salt, 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, auth->password, SCRYPT_OUTPUT_SIZE) == 0)
+ return 1;
+ else
+ return 0;
+}
+
+int auth_check_password_v1(const char *username, const char *password) {
+ struct auth_v2 auth;
+
+ if (auth_get_password(username, (char *)auth.password) == 0)
+ return 0;
+
+ if (auth_get_salt(username, auth.salt) == 0)
+ return 0;
+
+ return auth_check_scrypt(&auth, username, password);
+}
+
+int auth_check_password_v2(const char *username, const char *password) {
+ struct auth_v2 auth;
+
+ if (auth_get_data(username, (void *) &auth, sizeof(struct auth_v2)) == 0)
+ return 0;
+
+ return auth_check_scrypt(&auth, username, password);
+}
+
+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:
+ if (auth_check_password_v1(username, password)) {
+ /* Refresh to the newest version */
+ auth_set_password(username, password);
+ return 1;
+ } else {
+ return 0;
+ }
+ break;
+ case 2:
+ return auth_check_password_v2(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;
}
char *create_random_token() {
- unsigned char buf[TOKEN_SIZE];
+ char buf[TOKEN_SIZE];
char *token;
int rand_fd;
return token;
}
-int auth_login(const char *username, const char *password) {
- char filename[512];
- int token_fd;
+char * auth_login(const char *username, const char *password) {
+ char filename[FILENAME_MAX];
+ struct stringring *sr;
+ char *token;
+
if (!auth_check_password(username, password))
- return 0;
+ return NULL;
- sprintf(filename, "%s/%s/token", DATA_PATH, username);
- token_fd = open(filename, O_WRONLY | O_CREAT, 0600);
- if (token_fd == -1) {
- perror("Could not open token");
- return 0;
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens", blergconf.data_path, username);
+ sr = stringring_open(filename);
+ if (sr == NULL) {
+ return NULL;
}
+ token = create_random_token();
+ if (!stringring_add(sr, token)) {
+ free(token);
+ stringring_close(sr);
+ return NULL;
+ }
+ stringring_close(sr);
- 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) {
- char filename[512];
- sprintf(filename, "%s/%s/token", DATA_PATH, username);
- if (unlink(filename) == -1)
+int auth_logout(const char *username, const char *token) {
+ char filename[FILENAME_MAX];
+ struct stringring *sr;
+ int ret;
+
+ if (!valid_name(username))
return 0;
- return 1;
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens", blergconf.data_path, username);
+ if (access(filename, F_OK) != 0) {
+ return 0;
+ }
+ sr = stringring_open(filename);
+ if (sr == NULL) {
+ return 0;
+ }
+ ret = stringring_remove(sr, token);
+ stringring_close(sr);
+
+ return ret;
}
-char *auth_get_token(const char *username) {
- char filename[512];
- char *token;
- int token_fd;
+int auth_check_token(const char *username, const char *given_token) {
+ char filename[FILENAME_MAX];
+ struct stringring *sr;
+ int ret;
- 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;
+ snprintf(filename, FILENAME_MAX, "%s/%s/tokens", blergconf.data_path, username);
+ if (access(filename, F_OK) != 0) {
+ return 0;
}
+ sr = stringring_open(filename);
+ if (sr == NULL) {
+ return 0;
+ }
+ ret = (stringring_find(sr, given_token, AUTHENTICATION_TIMEOUT) != -1);
+ if (ret == 1) {
+ /* Update token timestamp */
+ stringring_touch(sr, given_token);
+ }
+ stringring_close(sr);
- token = malloc(TOKEN_SIZE * 2 + 1);
- read(token_fd, token, TOKEN_SIZE * 2);
- close(token_fd);
-
- return token;
+ return ret;
}
-int auth_check_token(const char *username, const char *given_token) {
- char *token = auth_get_token(username);
- if (token != NULL && given_token != NULL) {
- int ret = (strncmp(token, given_token, TOKEN_SIZE * 2) == 0);
- free(token);
- return ret;
- } else {
+/* Return a 32-bit integer "counter" that will change when the password is
+ * updated. Used to invalidate password recovery schemes after the password is
+ * updated. Returns the counter in the "counter" argument, and returns
+ * true/false on success/failure. */
+int auth_get_counter(const char *username, uint32_t *counter) {
+ struct auth_v2 auth;
+ struct MD5Context ctx;
+ uint8_t md5hash[MD5_DIGEST_SIZE];
+
+ if (auth_get_data(username, (void *) &auth, sizeof(struct auth_v2)) == 0)
return 0;
- }
+
+ /* There's probably going to be some question about using MD5 here.
+ * All I really need is to quickly and repeatably scramble some bits.
+ * MD5 can still do that. */
+ MD5Init(&ctx);
+ MD5Update(&ctx, auth.password, SCRYPT_OUTPUT_SIZE);
+ MD5Update(&ctx, auth.salt, SCRYPT_SALT_SIZE);
+ MD5Final((unsigned char *)md5hash, &ctx);
+
+ *counter = ((uint32_t *)md5hash)[0];
+
+ return 1;
}
projects / blerg.git / blobdiff