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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "af_alg_ops.h"
#include <unistd.h>
#include <errno.h>
#include <linux/socket.h>
#include <debug.h>
typedef struct private_af_alg_ops_t private_af_alg_ops_t;
/**
* Private data of an af_alg_ops_t object.
*/
struct private_af_alg_ops_t {
/**
* Public af_alg_ops_t interface.
*/
af_alg_ops_t public;
/**
* Transform FD
*/
int tfm;
/**
* Operation FD
*/
int op;
};
METHOD(af_alg_ops_t, reset, void,
private_af_alg_ops_t *this)
{
if (this->op != -1)
{
close(this->op);
this->op = -1;
}
}
METHOD(af_alg_ops_t, hash, void,
private_af_alg_ops_t *this, chunk_t data, char *out, size_t outlen)
{
ssize_t len;
while (this->op == -1)
{
this->op = accept(this->tfm, NULL, 0);
if (this->op == -1)
{
DBG1(DBG_LIB, "opening AF_ALG hasher failed: %s", strerror(errno));
sleep(1);
}
}
do
{
len = send(this->op, data.ptr, data.len, out ? 0 : MSG_MORE);
if (len == -1)
{
DBG1(DBG_LIB, "writing to AF_ALG hasher failed: %s", strerror(errno));
sleep(1);
}
else
{
data = chunk_skip(data, len);
}
}
while (data.len);
if (out)
{
while (read(this->op, out, outlen) != outlen)
{
DBG1(DBG_LIB, "reading AF_ALG hasher failed: %s", strerror(errno));
sleep(1);
}
reset(this);
}
}
METHOD(af_alg_ops_t, crypt, void,
private_af_alg_ops_t *this, u_int32_t type, chunk_t iv, chunk_t data,
char *out)
{
struct msghdr msg = {};
struct cmsghdr *cmsg;
struct af_alg_iv *ivm;
struct iovec iov;
char buf[CMSG_SPACE(sizeof(type)) +
CMSG_SPACE(offsetof(struct af_alg_iv, iv) + iv.len)];
ssize_t len;
int op;
while ((op = accept(this->tfm, NULL, 0)) == -1)
{
DBG1(DBG_LIB, "accepting AF_ALG crypter failed: %s", strerror(errno));
sleep(1);
}
memset(buf, 0, sizeof(buf));
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_ALG;
cmsg->cmsg_type = ALG_SET_OP;
cmsg->cmsg_len = CMSG_LEN(sizeof(type));
memcpy(CMSG_DATA(cmsg), &type, sizeof(type));
cmsg = CMSG_NXTHDR(&msg, cmsg);
cmsg->cmsg_level = SOL_ALG;
cmsg->cmsg_type = ALG_SET_IV;
cmsg->cmsg_len = CMSG_LEN(offsetof(struct af_alg_iv, iv) + iv.len);
ivm = (void*)CMSG_DATA(cmsg);
ivm->ivlen = iv.len;
memcpy(ivm->iv, iv.ptr, iv.len);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
while (data.len)
{
iov.iov_base = data.ptr;
iov.iov_len = data.len;
len = sendmsg(op, &msg, 0);
if (len == -1)
{
DBG1(DBG_LIB, "writing to AF_ALG crypter failed: %s",
strerror(errno));
sleep(1);
continue;
}
if (read(op, out, len) != len)
{
DBG1(DBG_LIB, "reading from AF_ALG crypter failed: %s",
strerror(errno));
}
data = chunk_skip(data, len);
/* no IV for subsequent data chunks */
msg.msg_controllen = 0;
}
close(op);
}
METHOD(af_alg_ops_t, set_key, void,
private_af_alg_ops_t *this, chunk_t key)
{
if (setsockopt(this->tfm, SOL_ALG, ALG_SET_KEY, key.ptr, key.len) == -1)
{
DBG1(DBG_LIB, "setting AF_ALG key failed: %s", strerror(errno));
}
}
METHOD(af_alg_ops_t, destroy, void,
private_af_alg_ops_t *this)
{
close(this->tfm);
if (this->op != -1)
{
close(this->op);
}
free(this);
}
/**
* See header
*/
af_alg_ops_t *af_alg_ops_create(char *type, char *alg)
{
private_af_alg_ops_t *this;
struct sockaddr_alg sa = {
.salg_family = AF_ALG,
};
strncpy(sa.salg_type, type, sizeof(sa.salg_type));
strncpy(sa.salg_name, alg, sizeof(sa.salg_name));
INIT(this,
.public = {
.hash = _hash,
.reset = _reset,
.crypt = _crypt,
.set_key = _set_key,
.destroy = _destroy,
},
.tfm = socket(AF_ALG, SOCK_SEQPACKET, 0),
.op = -1,
);
if (this->tfm == -1)
{
DBG1(DBG_LIB, "opening AF_ALG socket failed: %s", strerror(errno));
free(this);
return NULL;
}
if (bind(this->tfm, (struct sockaddr*)&sa, sizeof(sa)) == -1)
{
if (errno != ENOENT)
{ /* fail silently if algorithm not supported */
DBG1(DBG_LIB, "binding AF_ALG socket for '%s' failed: %s",
sa.salg_name, strerror(errno));
}
destroy(this);
return NULL;
}
return &this->public;
}
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