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afalg.c
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/*
* OpenSSL AFALG engine
*
* Copyright 2019 Eneas Ulir de Queiroz
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Based on The OpenSSL Project Authors' devcrypto engine.
* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
*/
#ifdef AFALG_ZERO_COPY
/* Required for vmsplice */
# ifndef _GNU_SOURCE
# define _GNU_SOURCE
# endif
# include <sys/uio.h>
static size_t zc_maxsize, pagemask;
#endif
#include <asm/byteorder.h>
#include <asm/types.h>
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#ifndef AFALG_NO_CRYPTOUSER
# include <linux/cryptouser.h>
#elif !defined(CRYPTO_MAX_NAME)
# define CRYPTO_MAX_NAME 64
#endif
#include <linux/if_alg.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <openssl/conf.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
/* linux/crypto.h is not public, so we must define the type and masks here,
* and hope they are still valid. */
#ifndef CRYPTO_ALG_TYPE_MASK
# define CRYPTO_ALG_TYPE_MASK 0x0000000f
# define CRYPTO_ALG_TYPE_BLKCIPHER 0x00000004
# define CRYPTO_ALG_TYPE_SKCIPHER 0x00000005
# define CRYPTO_ALG_TYPE_SHASH 0x0000000e
# define CRYPTO_ALG_TYPE_AHASH 0x0000000f
# define CRYPTO_ALG_KERN_DRIVER_ONLY 0x00001000
# define CRYPTO_ALG_INTERNAL 0x00002000
#endif
#ifndef OSSL_NELEM
# define OSSL_NELEM(x) (sizeof(x)/sizeof((x)[0]))
#endif
#define engine_afalg_id "afalg"
#define AFALG_REQUIRE_ACCELERATED 0 /* require confirmation of acceleration */
#define AFALG_USE_SOFTWARE 1 /* allow software drivers */
#define AFALG_REJECT_SOFTWARE 2 /* only disallow confirmed software drivers */
#ifndef AFALG_DEFAULT_USE_SOFTDRIVERS
# define AFALG_DEFAULT_USE_SOFTDRIVERS AFALG_REJECT_SOFTWARE
#endif
static int use_softdrivers = AFALG_DEFAULT_USE_SOFTDRIVERS;
/*
* cipher/digest status & acceleration definitions
* Make sure the defaults are set to 0
*/
struct driver_info_st {
enum afalg_status_t {
AFALG_STATUS_FAILURE = -3, /* unusable for other reason */
AFALG_STATUS_NO_COPY = -2, /* hash state copy not supported */
AFALG_STATUS_NO_OPEN = -1, /* bind call failed */
AFALG_STATUS_UNKNOWN = 0, /* not tested yet */
AFALG_STATUS_USABLE = 1 /* algo can be used */
} status;
enum afalg_accelerated_t {
AFALG_NOT_ACCELERATED = -1, /* software implemented */
AFALG_ACCELERATION_UNKNOWN = 0, /* acceleration support unkown */
AFALG_ACCELERATED = 1 /* hardware accelerated */
} accelerated;
};
static int get_afalg_socket(const char *salg_name, const char *salg_type,
const __u32 feat, const __u32 mask)
{
int fd = -1;
struct sockaddr_alg sa;
memset(&sa, 0, sizeof(sa));
sa.salg_family = AF_ALG;
OPENSSL_strlcpy((char *)sa.salg_type, salg_type, sizeof(sa.salg_type));
OPENSSL_strlcpy((char *)sa.salg_name, salg_name, sizeof(sa.salg_name));
sa.salg_feat = feat;
sa.salg_mask = mask;
if ((fd = socket(AF_ALG, SOCK_SEQPACKET, 0)) < 0) {
SYSerr(SYS_F_SOCKET, errno);
return -1;
}
if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == 0)
return fd;
close(fd);
return -1;
}
static int afalg_closefd(int fd)
{
int ret;
if (fd < 0 || (ret = close(fd)) == 0)
return 0;
/* For compatibility with openssl 1.1.0 */
#ifdef SYS_F_CLOSE
SYSerr(SYS_F_CLOSE, errno);
#endif
return ret;
}
struct afalg_alg_info {
char alg_name[CRYPTO_MAX_NAME];
char driver_name[CRYPTO_MAX_NAME];
__u32 priority;
__u32 flags;
};
static struct afalg_alg_info *afalg_alg_list = NULL;
static int afalg_alg_list_count = -1; /* no info available */
#ifndef AFALG_NO_CRYPTOUSER
static int prepare_afalg_alg_list(void)
{
int ret = -EFAULT;
/* NETLINK_CRYPTO specific */
void *buf = NULL;
struct nlmsghdr *res_n;
size_t buf_size;
struct {
struct nlmsghdr n;
struct crypto_user_alg cru;
} req;
struct crypto_user_alg *cru_res = NULL;
struct afalg_alg_info *list;
/* AF_NETLINK specific */
struct sockaddr_nl nl;
struct iovec iov;
struct msghdr msg;
struct rtattr *rta;
int nlfd, msg_len, rta_len, list_count;
__u32 alg_type;
memset(&req, 0, sizeof(req));
memset(&msg, 0, sizeof(msg));
list = afalg_alg_list = NULL;
afalg_alg_list_count = -1;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.cru));
req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH;
req.n.nlmsg_type = CRYPTO_MSG_GETALG;
/* open netlink socket */
nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_CRYPTO);
if (nlfd < 0) {
if (errno != EPROTONOSUPPORT) /* crypto_user module not available */
perror("Netlink error: cannot open netlink socket");
return -errno;
}
memset(&nl, 0, sizeof(nl));
nl.nl_family = AF_NETLINK;
if (bind(nlfd, (struct sockaddr*)&nl, sizeof(nl)) < 0) {
perror("Netlink error: cannot bind netlink socket");
ret = -errno;
goto out;
}
/* sending data */
memset(&nl, 0, sizeof(nl));
nl.nl_family = AF_NETLINK;
iov.iov_base = (void*) &req.n;
iov.iov_len = req.n.nlmsg_len;
msg.msg_name = &nl;
msg.msg_namelen = sizeof(nl);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if (sendmsg(nlfd, &msg, 0) < 0) {
perror("Netlink error: sendmsg failed");
ret = -errno;
goto out;
}
/* get the msg size */
iov.iov_base = NULL;
iov.iov_len = 0;
buf_size = recvmsg(nlfd, &msg, MSG_PEEK | MSG_TRUNC);
buf = OPENSSL_zalloc(buf_size);
iov.iov_base = buf;
iov.iov_len = buf_size;
while (1) {
if ((msg_len = recvmsg(nlfd, &msg, 0)) <= 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
if (msg_len == 0)
perror("Nelink error: no data");
else
perror("Nelink error: netlink receive error");
ret = -errno;
goto out;
}
if ((u_int32_t)msg_len > buf_size) {
perror("Netlink error: received too much data");
ret = -errno;
goto out;
}
break;
}
ret = -EFAULT;
list_count = 0;
for (res_n = (struct nlmsghdr *)buf; (ret = NLMSG_OK(res_n, msg_len));
res_n = NLMSG_NEXT(res_n, msg_len)) {
if (res_n->nlmsg_type == NLMSG_ERROR) {
ret = 0;
goto out;
}
cru_res = NLMSG_DATA(res_n);
if (res_n->nlmsg_type != CRYPTO_MSG_GETALG
|| !cru_res || res_n->nlmsg_len < NLMSG_SPACE(sizeof(*cru_res)))
continue;
alg_type = cru_res->cru_flags & CRYPTO_ALG_TYPE_MASK;
if ((alg_type != CRYPTO_ALG_TYPE_SKCIPHER && alg_type != CRYPTO_ALG_TYPE_BLKCIPHER
&& alg_type != CRYPTO_ALG_TYPE_SHASH && alg_type != CRYPTO_ALG_TYPE_AHASH)
|| cru_res->cru_flags & CRYPTO_ALG_INTERNAL)
continue;
list = OPENSSL_realloc(afalg_alg_list, (list_count + 1) * sizeof(struct afalg_alg_info));
if (list == NULL) {
OPENSSL_free(afalg_alg_list);
afalg_alg_list = NULL;
ret = -ENOMEM;
goto out;
}
memset(&list[list_count], 0, sizeof(struct afalg_alg_info));
afalg_alg_list = list;
rta_len=msg_len;
list[list_count].priority = 0;
for (rta = (struct rtattr *)(((char *) cru_res)
+ NLMSG_ALIGN(sizeof(struct crypto_user_alg)));
(ret = RTA_OK (rta, rta_len)); rta = RTA_NEXT(rta, rta_len)) {
if (rta->rta_type == CRYPTOCFGA_PRIORITY_VAL) {
list[list_count].priority = *((__u32 *)RTA_DATA(rta));
break;
}
}
OPENSSL_strlcpy(list[list_count].alg_name, cru_res->cru_name,
sizeof(list->alg_name));
OPENSSL_strlcpy(list[list_count].driver_name, cru_res->cru_driver_name,
sizeof(list->driver_name));
list[list_count].flags = cru_res->cru_flags;
list_count++;
}
ret = afalg_alg_list_count = list_count;
out:
close(nlfd);
OPENSSL_free(buf);
return ret;
}
#endif
#ifndef AFALG_NO_CRYPTOUSER
static const char *
afalg_get_driver_name(const char *alg_name,
enum afalg_accelerated_t expected_accel)
{
int i;
__u32 priority = 0;
int found = 0;
enum afalg_accelerated_t accel;
const char *driver_name = "unknown";
for (i = 0; i < afalg_alg_list_count; i++) {
if (strcmp(afalg_alg_list[i].alg_name, alg_name) ||
priority > afalg_alg_list[i].priority)
continue;
if (afalg_alg_list[i].flags & CRYPTO_ALG_KERN_DRIVER_ONLY)
accel = AFALG_ACCELERATED;
else
accel = AFALG_NOT_ACCELERATED;
if ((found && priority == afalg_alg_list[i].priority)
|| accel != expected_accel) {
driver_name = "**unreliable info**";
} else {
found = 1;
priority = afalg_alg_list[i].priority;
driver_name = afalg_alg_list[i].driver_name;
}
}
return driver_name;
}
#endif
/******************************************************************************
*
* Ciphers
*
*****/
struct cipher_data_st {
int nid;
int blocksize;
int keylen;
int ivlen;
int flags;
const char *name;
#ifndef AFALG_NO_FALLBACK
const EVP_CIPHER *((*fallback) (void));
int fb_threshold;
#endif
};
struct cipher_ctx {
int bfd, sfd;
#ifdef AFALG_ZERO_COPY
int pipes[2];
#endif
#ifndef AFALG_NO_FALLBACK
EVP_CIPHER_CTX *fallback;
int fb_threshold;
#endif
int control_is_set;
const struct cipher_data_st *cipher_d;
unsigned int blocksize, num;
unsigned char partial[EVP_MAX_BLOCK_LENGTH];
};
static const struct cipher_data_st cipher_data[] = {
#ifndef OPENSSL_NO_DES
{ NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, "cbc(des)",
#ifndef AFALG_NO_FALLBACK
EVP_des_cbc, 320
#endif
},
{ NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, "cbc(des3_ede)",
#ifndef AFALG_NO_FALLBACK
EVP_des_ede3_cbc, 96
#endif
},
#endif
#ifndef OPENSSL_NO_BF
{ NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, "cbc(blowfish)" },
#endif
#ifndef OPENSSL_NO_CAST
{ NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, "cbc(cast5)" },
#endif
{ NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, "cbc(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_128_cbc, 1536
#endif
},
{ NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, "cbc(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_192_cbc, 1152
#endif
},
{ NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, "cbc(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_256_cbc, 960
#endif
},
{ NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, "ctr(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_128_ctr, 1360
#endif
},
{ NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, "ctr(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_192_ctr, 1152
#endif
},
{ NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, "ctr(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_256_ctr, 960
#endif
},
{ NID_aes_128_ecb, 16, 128 / 8, 0, EVP_CIPH_ECB_MODE, "ecb(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_128_ecb, 2048
#endif
},
{ NID_aes_192_ecb, 16, 192 / 8, 0, EVP_CIPH_ECB_MODE, "ecb(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_192_ecb, 1440
#endif
},
{ NID_aes_256_ecb, 16, 256 / 8, 0, EVP_CIPH_ECB_MODE, "ecb(aes)",
#ifndef AFALG_NO_FALLBACK
EVP_aes_256_ecb, 1152
#endif
},
#if 0
/* Current camellia kernel module does not implement the skcipher
* interface, necessary to work with AF_ALG */
#ifndef OPENSSL_NO_CAMELLIA
{ NID_camellia_128_cbc, 16, 128 / 8, 8, EVP_CIPH_CBC_MODE,
"cbc(camellia)" },
{ NID_camellia_192_cbc, 16, 192 / 8, 8, EVP_CIPH_CBC_MODE,
"cbc(camellia)" },
{ NID_camellia_256_cbc, 16, 256 / 8, 8, EVP_CIPH_CBC_MODE,
"cbc(camellia)" },
#endif
#endif
};
static size_t find_cipher_data_index(int nid)
{
size_t i;
for (i = 0; i < OSSL_NELEM(cipher_data); i++)
if (nid == cipher_data[i].nid)
return i;
return (size_t)-1;
}
static size_t get_cipher_data_index(int nid)
{
size_t i = find_cipher_data_index(nid);
if (i != (size_t)-1)
return i;
/*
* Code further down must make sure that only NIDs in the table above
* are used. If any other NID reaches this function, there's a grave
* coding error further down.
*/
assert("Code that never should be reached" == NULL);
return -1;
}
static int afalg_set_key(int sfd, const void *key, int keylen)
{
if (setsockopt(sfd, SOL_ALG, ALG_SET_KEY, key, keylen) >= 0)
return 1;
SYSerr(SYS_F_SETSOCKOPT, errno);
return 0;
}
static int afalg_set_control(struct msghdr *msg, int op,
const unsigned char *iv, unsigned int ivlen)
{
size_t set_op_len = sizeof(op);
size_t set_iv_len;
struct cmsghdr *cmsg;
struct af_alg_iv *aiv;
if (!iv)
ivlen = 0;
set_iv_len = offsetof(struct af_alg_iv, iv) + ivlen;
msg->msg_controllen = CMSG_SPACE(set_op_len)
+ (ivlen > 0 ? CMSG_SPACE(set_iv_len) : 0);
msg->msg_control = OPENSSL_zalloc(msg->msg_controllen);
if (msg->msg_control == NULL) {
perror("afalg_set_control: OPENSSL_zalloc");
return 0;
}
cmsg = CMSG_FIRSTHDR(msg);
if (cmsg == NULL) {
fprintf(stderr, "%s: CMSG_FIRSTHDR error setting op.\n", __func__);
goto err;
}
cmsg->cmsg_level = SOL_ALG;
cmsg->cmsg_type = ALG_SET_OP;
cmsg->cmsg_len = CMSG_LEN(sizeof(op));
*(CMSG_DATA(cmsg)) = op;
if (ivlen == 0)
return 1;
cmsg = CMSG_NXTHDR(msg, cmsg);
if (cmsg == NULL) {
fprintf(stderr, "%s: CMSG_NXTHDR error setting iv.\n", __func__);
goto err;
}
cmsg->cmsg_level = SOL_ALG;
cmsg->cmsg_type = ALG_SET_IV;
cmsg->cmsg_len = CMSG_LEN(offsetof(struct af_alg_iv, iv) + ivlen);
aiv = (void *)CMSG_DATA(cmsg);
aiv->ivlen = ivlen;
memcpy(aiv->iv, iv, ivlen);
return 1;
err:
free(msg->msg_control);
msg->msg_control = NULL;
msg->msg_controllen = 0;
return 0;
}
#ifndef AFALG_NO_FALLBACK
static EVP_CIPHER_CTX *cipher_fb_ctx[OSSL_NELEM(cipher_data)][2] = { { NULL, }, };
static int cipher_fb_threshold[OSSL_NELEM(cipher_data)] = { 0, };
static int prepare_cipher_fallback(int i, int enc)
{
cipher_fb_ctx[i][enc] = EVP_CIPHER_CTX_new();
if (!cipher_fb_ctx[i][enc])
return 0;
if (EVP_CipherInit_ex(cipher_fb_ctx[i][enc], cipher_data[i].fallback(),
NULL, NULL, NULL, enc))
return 1;
EVP_CIPHER_CTX_free(cipher_fb_ctx[i][enc]);
cipher_fb_ctx[i][enc] = NULL;
return 0;
}
static int cipher_fb_init(struct cipher_ctx *cipher_ctx,
EVP_CIPHER_CTX *source_ctx,
const unsigned char *key,
const unsigned char *iv, int enc)
{
cipher_ctx->fallback = EVP_CIPHER_CTX_new();
const EVP_CIPHER *fb_cipher;
int (*fb_init) (EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
if (!EVP_CIPHER_CTX_copy(cipher_ctx->fallback, source_ctx))
goto out;
if (!(fb_cipher = EVP_CIPHER_CTX_cipher(cipher_ctx->fallback)))
goto out;
if (!(fb_init = EVP_CIPHER_meth_get_init(fb_cipher)))
goto out;
if (fb_init(cipher_ctx->fallback, key, iv, enc))
return 1;
out:
free(cipher_ctx->fallback);
cipher_ctx->fallback = NULL;
return 0;
}
#endif
static int cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
struct cipher_ctx *cipher_ctx =
(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
size_t i = get_cipher_data_index(EVP_CIPHER_CTX_nid(ctx));
const struct cipher_data_st *cipher_d = &cipher_data[i];
int keylen;
int mode = EVP_CIPHER_CTX_mode(ctx);
__u32 afalg_mask;
if (cipher_ctx->bfd == -1) {
if (mode == EVP_CIPH_CTR_MODE)
cipher_ctx->blocksize = cipher_d->blocksize;
if (use_softdrivers == AFALG_REQUIRE_ACCELERATED)
afalg_mask = CRYPTO_ALG_KERN_DRIVER_ONLY;
else
afalg_mask = 0;
cipher_ctx->bfd = get_afalg_socket(cipher_d->name, "skcipher",
afalg_mask, afalg_mask);
if (cipher_ctx->bfd < 0) {
SYSerr(SYS_F_BIND, errno);
return 0;
}
}
if (cipher_ctx->sfd != -1) {
close(cipher_ctx->sfd);
cipher_ctx->sfd = -1;
}
if (key != NULL) {
if ((keylen = EVP_CIPHER_CTX_key_length(ctx)) > 0
&& !afalg_set_key(cipher_ctx->bfd, key, keylen)) {
fprintf(stderr, "cipher_init: Error setting key.\n");
goto err;
}
#ifndef AFALG_NO_FALLBACK
if (cipher_fb_ctx[i][enc]) {
if (!cipher_fb_init(cipher_ctx, cipher_fb_ctx[i][enc], key, iv,
enc)) {
fprintf(stderr, "cipher_init: Warning: Cannot set fallback key."
" Fallback will not be used!\n");
} else {
cipher_ctx->fb_threshold = cipher_fb_threshold[i];
}
}
#endif
}
if ((cipher_ctx->sfd = accept(cipher_ctx->bfd, NULL, 0)) < 0) {
perror("cipher_init: accept");
goto err;
}
#ifdef AFALG_ZERO_COPY
if (pipe(cipher_ctx->pipes) < 0) {
perror("cipher_init: pipes");
goto err;
}
#endif
cipher_ctx->cipher_d = cipher_d;
return 1;
err:
close(cipher_ctx->bfd);
if (cipher_ctx->sfd >= 0) {
close(cipher_ctx->sfd);
cipher_ctx->sfd = -1;
}
return 0;
}
static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
struct cipher_ctx *cipher_ctx =
(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
struct msghdr msg = { 0 };
struct iovec iov;
ssize_t res = -1;
int ret = 0;
int op = EVP_CIPHER_CTX_encrypting(ctx) ? ALG_OP_ENCRYPT : ALG_OP_DECRYPT;
int ivlen = EVP_CIPHER_CTX_iv_length(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
#ifndef AFALG_NO_FALLBACK
if (inl < cipher_ctx->fb_threshold) {
const EVP_CIPHER *fb_cipher;
int (*fb_do_cipher) (EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
if ((fb_cipher = EVP_CIPHER_CTX_cipher(cipher_ctx->fallback))
&& (fb_do_cipher = EVP_CIPHER_meth_get_do_cipher(fb_cipher))) {
if (ivlen) {
memcpy(EVP_CIPHER_CTX_iv_noconst(cipher_ctx->fallback), iv, ivlen);
cipher_ctx->control_is_set = 0;
}
return fb_do_cipher (cipher_ctx->fallback, out, in, inl);
}
}
#endif
if (!cipher_ctx->control_is_set) {
afalg_set_control(&msg, op, iv, ivlen);
cipher_ctx->control_is_set = 1;
}
iov.iov_base = (void *)in;
iov.iov_len = inl;
#ifdef AFALG_ZERO_COPY
if (inl <= zc_maxsize && ((size_t)in & pagemask) == 0) {
if (msg.msg_control && sendmsg(cipher_ctx->sfd, &msg, 0) < 0) {
perror ("afalg_do_cipher: sendmsg");
goto out;
}
res = vmsplice(cipher_ctx->pipes[1], &iov, 1,
SPLICE_F_GIFT & SPLICE_F_MORE);
if (res < 0) {
perror("afalg_do_cipher: vmsplice");
goto out;
} else if (res != (ssize_t) inl) {
fprintf(stderr,
"afalg_do_cipher: vmsplice: sent %zd bytes != len %zd\n",
res, inl);
goto out;
}
res = splice(cipher_ctx->pipes[0], NULL, cipher_ctx->sfd, NULL, inl, 0);
if (res < 0) {
perror("afalg_do_cipher: splice");
goto out;
} else if (res != (ssize_t) inl) {
fprintf(stderr,
"afalg_do_cipher: splice: spliced %zd bytes != len %zd\n",
res, inl);
goto out;
}
} else
#endif
{
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if ((res = sendmsg(cipher_ctx->sfd, &msg, 0)) < 0) {
perror("afalg_do_cipher: sendmsg");
goto out;
} else if (res != (ssize_t) inl) {
fprintf(stderr, "afalg_do_cipher: sent %zd bytes != len %zd\n",
res, inl);
goto out;
}
}
if ((res = read(cipher_ctx->sfd, out, inl)) == (ssize_t) inl)
ret = 1;
else
fprintf(stderr, "afalg_do_cipher: read %zd bytes != len %zd\n",
res, inl);
out:
if (msg.msg_control)
OPENSSL_free(msg.msg_control);
return ret;
}
static int cbc_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
#ifndef AFALG_NO_FALLBACK
int enc = EVP_CIPHER_CTX_encrypting(ctx);
size_t ivlen = EVP_CIPHER_CTX_iv_length(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
unsigned char saved_iv[EVP_MAX_IV_LENGTH];
int ret;
assert(inl >= ivlen);
if (!enc)
memcpy(saved_iv, in + inl - ivlen, ivlen);
if ((ret = afalg_do_cipher(ctx, out, in, inl)))
memcpy(iv, enc ? out + inl - ivlen : saved_iv, ivlen);
return ret;
#else
return afalg_do_cipher(ctx, out, in, inl);
#endif
}
#if !defined(AFALG_KERNEL_UPDATES_CTR_IV) || !defined(AFALG_NO_FALLBACK)
static void ctr_update_iv(unsigned char *iv, size_t ivlen, __u64 nblocks)
{
__be64 *a = (__be64 *)(iv + ivlen);
__u64 b;
for (; ivlen >= 8; ivlen -= 8) {
b = nblocks + __be64_to_cpu(*--a);
*a = __cpu_to_be64(b);
if (nblocks < b)
return;
nblocks = 1;
}
}
#endif
static int ctr_do_blocks(EVP_CIPHER_CTX *ctx, struct cipher_ctx *cipher_ctx,
unsigned char *out, const unsigned char *in,
size_t inl, size_t nblocks)
{
#if !defined(AFALG_KERNEL_UPDATES_CTR_IV) || !defined(AFALG_NO_FALLBACK)
int ret;
size_t ivlen = EVP_CIPHER_CTX_iv_length(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
ret = afalg_do_cipher(ctx, out, in, inl);
if (ret) {
if (cipher_ctx->control_is_set) {
ctr_update_iv(iv, ivlen, nblocks);
# ifndef AFALG_KERNEL_UPDATES_CTR_IV
cipher_ctx->control_is_set = 0;
# endif
} else {
# ifndef AFALG_NO_FALLBACK
memcpy(iv, EVP_CIPHER_CTX_iv(cipher_ctx->fallback), ivlen);
# endif
}
}
return ret;
#else
(void)cipher_ctx;
(void)nblocks;
return afalg_do_cipher(ctx, out, in, inl);
#endif
}
static int ctr_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
struct cipher_ctx *cipher_ctx =
(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
size_t nblocks, len;
/* handle initial partial block */
while (cipher_ctx->num && inl) {
(*out++) = *(in++) ^ cipher_ctx->partial[cipher_ctx->num];
--inl;
cipher_ctx->num = (cipher_ctx->num + 1) % cipher_ctx->blocksize;
}
/* process full blocks */
if (inl >= (unsigned int) cipher_ctx->blocksize) {
nblocks = inl / cipher_ctx->blocksize;
len = nblocks * cipher_ctx->blocksize;
if (!ctr_do_blocks(ctx, cipher_ctx, out, in, len, nblocks))
return 0;
inl -= len;
out += len;
in += len;
}
/* process final partial block */
if (inl) {
memset(cipher_ctx->partial, 0, cipher_ctx->blocksize);
if (!ctr_do_blocks(ctx, cipher_ctx, cipher_ctx->partial,
cipher_ctx->partial, cipher_ctx->blocksize, 1))
return 0;
while (inl--) {
out[cipher_ctx->num] = in[cipher_ctx->num]
^ cipher_ctx->partial[cipher_ctx->num];
cipher_ctx->num++;
}
}
return 1;
}
static int cipher_ctrl(EVP_CIPHER_CTX *ctx, int type, int p1, void* p2)
{
struct cipher_ctx *cipher_ctx =
(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
struct cipher_ctx *to_cipher_ctx;
(void)p1;
switch (type) {
case EVP_CTRL_COPY:
if (cipher_ctx == NULL)
return 1;
/* when copying the context, a new session needs to be initialized */
to_cipher_ctx = (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(
(EVP_CIPHER_CTX *)p2);
to_cipher_ctx->bfd = to_cipher_ctx->sfd = -1;
to_cipher_ctx->control_is_set = 0;
#ifdef AFALG_ZERO_COPY
if (pipe(to_cipher_ctx->pipes) != 0)
return 0;
#endif
#ifndef AFALG_NO_FALLBACK
if (cipher_ctx->fallback) {
if (!(to_cipher_ctx->fallback = EVP_CIPHER_CTX_new()))
return 0;
if (!EVP_CIPHER_CTX_copy(to_cipher_ctx->fallback,
cipher_ctx->fallback)) {
EVP_CIPHER_CTX_free(to_cipher_ctx->fallback);
to_cipher_ctx->fallback = NULL;
return 0;
}
}
#endif
if ((to_cipher_ctx->bfd = dup(cipher_ctx->bfd)) == -1) {
perror(__func__);
return 0;
}
if ((to_cipher_ctx->sfd = accept(to_cipher_ctx->bfd, NULL, 0)) != -1)
return 1;
SYSerr(SYS_F_ACCEPT, errno);
#ifdef AFALG_ZERO_COPY
close(to_cipher_ctx->pipes[0]);
close(to_cipher_ctx->pipes[1]);
#endif
return 0;
case EVP_CTRL_INIT:
cipher_ctx->bfd = cipher_ctx->sfd = -1;
return 1;
default:
break;
}
return -1;
}
static int cipher_cleanup(EVP_CIPHER_CTX *ctx)
{
struct cipher_ctx *cipher_ctx =
(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
int ret;
if (cipher_ctx == NULL)
return 1;
#ifndef AFALG_NO_FALLBACK
if (cipher_ctx->fallback) {
EVP_CIPHER_CTX_free(cipher_ctx->fallback);
cipher_ctx->fallback = NULL;
}
#endif
ret = !(0
#ifdef AFALG_ZERO_COPY
| afalg_closefd(cipher_ctx->pipes[0])
| afalg_closefd(cipher_ctx->pipes[1])
#endif
| afalg_closefd(cipher_ctx->sfd)
| afalg_closefd(cipher_ctx->bfd));
cipher_ctx->bfd = cipher_ctx->sfd = -1;
return ret;
}
/*
* Keep tables of known nids, associated methods, selected ciphers, and driver
* info.
* Note that known_cipher_nids[] isn't necessarily indexed the same way as
* cipher_data[] above, which the other tables are.
*/
static int known_cipher_nids[OSSL_NELEM(cipher_data)];
static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */
static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, };
static int selected_ciphers[OSSL_NELEM(cipher_data)];
static struct driver_info_st cipher_driver_info[OSSL_NELEM(cipher_data)];
static int afalg_test_cipher(size_t cipher_data_index)
{
return (cipher_driver_info[cipher_data_index].status == AFALG_STATUS_USABLE
&& selected_ciphers[cipher_data_index] == 1
&& (cipher_driver_info[cipher_data_index].accelerated
== AFALG_ACCELERATED
|| use_softdrivers == AFALG_USE_SOFTWARE
|| (cipher_driver_info[cipher_data_index].accelerated
!= AFALG_NOT_ACCELERATED
&& use_softdrivers == AFALG_REJECT_SOFTWARE)));
}
static void prepare_cipher_methods(void)
{
size_t i;
int fd, blocksize;
int (*do_cipher) (EVP_CIPHER_CTX *, unsigned char *, const unsigned char *,
size_t);
for (i = 0, known_cipher_nids_amount = 0;
i < OSSL_NELEM(cipher_data); i++) {
selected_ciphers[i] = 1;
/*
* Check that the cipher is usable
*/
if ((fd =
get_afalg_socket(cipher_data[i].name, "skcipher", 0, 0)) < 0) {
cipher_driver_info[i].status = AFALG_STATUS_NO_OPEN;
continue;
}
close(fd);
/* test hardware acceleration */
if ((fd =
get_afalg_socket(cipher_data[i].name, "skcipher",
CRYPTO_ALG_KERN_DRIVER_ONLY,
CRYPTO_ALG_KERN_DRIVER_ONLY)) >= 0) {
cipher_driver_info[i].accelerated = AFALG_ACCELERATED;
close(fd);
} else {
cipher_driver_info[i].accelerated = AFALG_NOT_ACCELERATED;
}
blocksize = cipher_data[i].blocksize;
switch (cipher_data[i].flags & EVP_CIPH_MODE) {
case EVP_CIPH_CBC_MODE:
do_cipher = cbc_do_cipher;
break;
case EVP_CIPH_CTR_MODE:
do_cipher = ctr_do_cipher;
blocksize = 1;
break;
case EVP_CIPH_ECB_MODE:
do_cipher = afalg_do_cipher;
selected_ciphers[i] = 0;
break;
default:
cipher_driver_info[i].status = AFALG_STATUS_FAILURE;
known_cipher_methods[i] = NULL;
continue;
}
if ((known_cipher_methods[i] =
EVP_CIPHER_meth_new(cipher_data[i].nid, blocksize,
cipher_data[i].keylen)) == NULL
|| !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i],
cipher_data[i].ivlen)
|| !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
cipher_data[i].flags
| EVP_CIPH_CUSTOM_COPY
| EVP_CIPH_CTRL_INIT
| EVP_CIPH_FLAG_DEFAULT_ASN1)
|| !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
|| !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i], do_cipher)