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/*
* Copyright (C) 2006 International Business Machines Corp.
* Author: Mike Halcrow <mhalcrow@us.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef S_SPLINT_S
#include <stdio.h>
#endif
#include <string.h>
#include <errno.h>
#include <mntent.h>
#include <stdlib.h>
#include "../include/ecryptfs.h"
static int get_sysfs_mountpoint(char *mnt, int *mnt_size)
{
FILE *fp;
struct mntent *mntent;
int rc;
fp = fopen("/etc/mtab", "r");
if (!fp) {
rc = -errno;
goto out;
}
while ((mntent = getmntent(fp)))
if (strcmp(mntent->mnt_type, "sysfs") == 0) {
*mnt_size = strlen(mntent->mnt_dir);
if (mnt)
memcpy(mnt, mntent->mnt_dir, *mnt_size);
rc = 0;
fclose(fp);
goto out;
}
rc = -EINVAL;
fclose(fp);
out:
return rc;
}
int ecryptfs_get_version(uint32_t *version)
{
char *mnt;
char *handle;
char version_str[16];
ssize_t size;
int mnt_size;
int fd;
int rc;
rc = get_sysfs_mountpoint(NULL, &mnt_size);
if (rc)
goto out;
mnt = malloc(mnt_size + 1);
if (!mnt) {
rc = -ENOMEM;
goto out;
}
rc = get_sysfs_mountpoint(mnt, &mnt_size);
if (rc) {
free(mnt);
goto out;
}
mnt[mnt_size] = '\0';
rc = asprintf(&handle, "%s/fs/ecryptfs/version", mnt);
free(mnt);
if (rc == -1) {
rc = -ENOMEM;
goto out;
}
rc = 0;
fd = open(handle, O_RDONLY);
/* We can attempt to modprobe ecryptfs, which might help if we're
* being called by code running as root
*/
if (fd == -1 && errno == ENOENT &&
system("/sbin/modprobe ecryptfs 2>/dev/null") != -1)
fd = open(handle, O_RDONLY);
free(handle);
if (fd == -1) {
rc = -EINVAL;
goto out;
}
size = read(fd, version_str, 16);
close(fd);
if (size == -1 || size == 0) {
rc = -EINVAL;
goto out;
}
*version = atoi(version_str);
out:
return rc;
}
struct ecryptfs_version_str_map_elem {
uint32_t flag;
char *str;
} ecryptfs_version_str_map[] = {
{ECRYPTFS_VERSIONING_PASSPHRASE, "passphrase"},
{ECRYPTFS_VERSIONING_PUBKEY, "netlink daemon interface"},
{ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH, "plaintext passthrough"},
{ECRYPTFS_VERSIONING_POLICY, "policy"},
{ECRYPTFS_VERSIONING_XATTR, "metadata in extended attribute"},
{ECRYPTFS_VERSIONING_MISCDEV, "/dev/misc/ecryptfs daemon interface"},
{ECRYPTFS_VERSIONING_HMAC, "hmac"},
{ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION, "filename encryption"},
{ECRYPTFS_VERSIONING_GCM, "gcm cipher block chaining"},
};
/**
* positive on yes; zero on no
*/
int ecryptfs_supports_passphrase(uint32_t version)
{
return (version & ECRYPTFS_VERSIONING_PASSPHRASE);
}
int ecryptfs_supports_pubkey(uint32_t version)
{
return (version & ECRYPTFS_VERSIONING_PUBKEY);
}
int ecryptfs_supports_plaintext_passthrough(uint32_t version)
{
return (version & ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH);
}
int ecryptfs_supports_hmac(uint32_t version)
{
return (version & ECRYPTFS_VERSIONING_HMAC);
}
int ecryptfs_supports_filename_encryption(uint32_t version)
{
return (version & ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION);
}
int ecryptfs_supports_policy(uint32_t version)
{
return (version & ECRYPTFS_VERSIONING_POLICY);
}
int ecryptfs_supports_xattr(uint32_t version)
{
return (version & ECRYPTFS_VERSIONING_XATTR);
}
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