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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <linux/if_alg.h>
#include "test_progs.h"
#include "network_helpers.h"
#include "crypto_sanity.skel.h"
#include "crypto_basic.skel.h"
#define NS_TEST "crypto_sanity_ns"
#define IPV6_IFACE_ADDR "face::1"
static const unsigned char crypto_key[] = "testtest12345678";
static const char plain_text[] = "stringtoencrypt0";
static int opfd = -1, tfmfd = -1;
static const char algo[] = "ecb(aes)";
static int init_afalg(void)
{
struct sockaddr_alg sa = {
.salg_family = AF_ALG,
.salg_type = "skcipher",
.salg_name = "ecb(aes)"
};
tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
if (tfmfd == -1)
return errno;
if (bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa)) == -1)
return errno;
if (setsockopt(tfmfd, SOL_ALG, ALG_SET_KEY, crypto_key, 16) == -1)
return errno;
opfd = accept(tfmfd, NULL, 0);
if (opfd == -1)
return errno;
return 0;
}
static void deinit_afalg(void)
{
if (tfmfd != -1)
close(tfmfd);
if (opfd != -1)
close(opfd);
}
static void do_crypt_afalg(const void *src, void *dst, int size, bool encrypt)
{
struct msghdr msg = {};
struct cmsghdr *cmsg;
char cbuf[CMSG_SPACE(4)] = {0};
struct iovec iov;
msg.msg_control = cbuf;
msg.msg_controllen = sizeof(cbuf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_ALG;
cmsg->cmsg_type = ALG_SET_OP;
cmsg->cmsg_len = CMSG_LEN(4);
*(__u32 *)CMSG_DATA(cmsg) = encrypt ? ALG_OP_ENCRYPT : ALG_OP_DECRYPT;
iov.iov_base = (char *)src;
iov.iov_len = size;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
sendmsg(opfd, &msg, 0);
read(opfd, dst, size);
}
void test_crypto_basic(void)
{
RUN_TESTS(crypto_basic);
}
void test_crypto_sanity(void)
{
LIBBPF_OPTS(bpf_tc_hook, qdisc_hook, .attach_point = BPF_TC_EGRESS);
LIBBPF_OPTS(bpf_tc_opts, tc_attach_enc);
LIBBPF_OPTS(bpf_tc_opts, tc_attach_dec);
LIBBPF_OPTS(bpf_test_run_opts, opts);
struct nstoken *nstoken = NULL;
struct crypto_sanity *skel;
char afalg_plain[16] = {0};
char afalg_dst[16] = {0};
struct sockaddr_in6 addr;
int sockfd, err, pfd;
socklen_t addrlen;
u16 udp_test_port;
skel = crypto_sanity__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel open"))
return;
SYS(fail, "ip netns add %s", NS_TEST);
SYS(fail, "ip -net %s -6 addr add %s/128 dev lo nodad", NS_TEST, IPV6_IFACE_ADDR);
SYS(fail, "ip -net %s link set dev lo up", NS_TEST);
nstoken = open_netns(NS_TEST);
if (!ASSERT_OK_PTR(nstoken, "open_netns"))
goto fail;
err = init_afalg();
if (!ASSERT_OK(err, "AF_ALG init fail"))
goto fail;
qdisc_hook.ifindex = if_nametoindex("lo");
if (!ASSERT_GT(qdisc_hook.ifindex, 0, "if_nametoindex lo"))
goto fail;
skel->bss->key_len = 16;
skel->bss->authsize = 0;
udp_test_port = skel->data->udp_test_port;
memcpy(skel->bss->key, crypto_key, sizeof(crypto_key));
snprintf(skel->bss->algo, 128, "%s", algo);
pfd = bpf_program__fd(skel->progs.skb_crypto_setup);
if (!ASSERT_GT(pfd, 0, "skb_crypto_setup fd"))
goto fail;
err = bpf_prog_test_run_opts(pfd, &opts);
if (!ASSERT_OK(err, "skb_crypto_setup") ||
!ASSERT_OK(opts.retval, "skb_crypto_setup retval"))
goto fail;
if (!ASSERT_OK(skel->bss->status, "skb_crypto_setup status"))
goto fail;
err = bpf_tc_hook_create(&qdisc_hook);
if (!ASSERT_OK(err, "create qdisc hook"))
goto fail;
addrlen = sizeof(addr);
err = make_sockaddr(AF_INET6, IPV6_IFACE_ADDR, udp_test_port,
(void *)&addr, &addrlen);
if (!ASSERT_OK(err, "make_sockaddr"))
goto fail;
tc_attach_enc.prog_fd = bpf_program__fd(skel->progs.encrypt_sanity);
err = bpf_tc_attach(&qdisc_hook, &tc_attach_enc);
if (!ASSERT_OK(err, "attach encrypt filter"))
goto fail;
sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
if (!ASSERT_NEQ(sockfd, -1, "encrypt socket"))
goto fail;
err = sendto(sockfd, plain_text, sizeof(plain_text), 0, (void *)&addr, addrlen);
close(sockfd);
if (!ASSERT_EQ(err, sizeof(plain_text), "encrypt send"))
goto fail;
do_crypt_afalg(plain_text, afalg_dst, sizeof(afalg_dst), true);
if (!ASSERT_OK(skel->bss->status, "encrypt status"))
goto fail;
if (!ASSERT_STRNEQ(skel->bss->dst, afalg_dst, sizeof(afalg_dst), "encrypt AF_ALG"))
goto fail;
tc_attach_enc.flags = tc_attach_enc.prog_fd = tc_attach_enc.prog_id = 0;
err = bpf_tc_detach(&qdisc_hook, &tc_attach_enc);
if (!ASSERT_OK(err, "bpf_tc_detach encrypt"))
goto fail;
tc_attach_dec.prog_fd = bpf_program__fd(skel->progs.decrypt_sanity);
err = bpf_tc_attach(&qdisc_hook, &tc_attach_dec);
if (!ASSERT_OK(err, "attach decrypt filter"))
goto fail;
sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
if (!ASSERT_NEQ(sockfd, -1, "decrypt socket"))
goto fail;
err = sendto(sockfd, afalg_dst, sizeof(afalg_dst), 0, (void *)&addr, addrlen);
close(sockfd);
if (!ASSERT_EQ(err, sizeof(afalg_dst), "decrypt send"))
goto fail;
do_crypt_afalg(afalg_dst, afalg_plain, sizeof(afalg_plain), false);
if (!ASSERT_OK(skel->bss->status, "decrypt status"))
goto fail;
if (!ASSERT_STRNEQ(skel->bss->dst, afalg_plain, sizeof(afalg_plain), "decrypt AF_ALG"))
goto fail;
tc_attach_dec.flags = tc_attach_dec.prog_fd = tc_attach_dec.prog_id = 0;
err = bpf_tc_detach(&qdisc_hook, &tc_attach_dec);
ASSERT_OK(err, "bpf_tc_detach decrypt");
fail:
close_netns(nstoken);
deinit_afalg();
SYS_NOFAIL("ip netns del " NS_TEST " &> /dev/null");
crypto_sanity__destroy(skel);
}
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