From patchwork Wed Nov 29 17:33:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 13473263 X-Patchwork-Delegate: bpf@iogearbox.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="ZeR2ftPO" Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7072C10A; Wed, 29 Nov 2023 09:33:49 -0800 (PST) Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3ATH2Md8012840; Wed, 29 Nov 2023 09:33:33 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=s2048-2021-q4; bh=6/v8z4Fgk2CEec4jnM3kDnxpchKH/X6UsfniwZxr+NQ=; b=ZeR2ftPOvDiW5d6QPtjjl+QPJQ5u4p54MuL6C6ysPkvKeQd8JysAU1jd9DQtnRfVKzvU XnMEj9gW0C3tlO3R384Iir8TPMwTqYHcIzbJjGQiTBePbw/FbnsLWNyCjDk+r8eZo0us ZPTm0ykQ9q3l1CGdKu7bA9IJEgLtTQ+ndQUw9Ma1tPnx3krVQJOVE8ouva1vI6AYvS5j RUWoxEvQZnR/FtE+jMPRjua5HOXW3EGghP1V6glZcSEfu1wx55aMjn1GiR95U3Bxd1CO V29LXm9KsQ432tZgwZZkh+gMOgUg1lG3Gu6+4ONZIKjREkH7rMp7KnuEWXjM5agrKUOX IA== Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3up23gtvs1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Wed, 29 Nov 2023 09:33:33 -0800 Received: from devvm4158.cln0.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:11d::8) with Microsoft SMTP Server id 15.1.2507.34; Wed, 29 Nov 2023 09:33:31 -0800 From: Vadim Fedorenko To: Vadim Fedorenko , Jakub Kicinski , Martin KaFai Lau , Andrii Nakryiko , Alexei Starovoitov , Mykola Lysenko , Herbert Xu CC: Vadim Fedorenko , , , Subject: [PATCH bpf-next v6 3/3] selftests: bpf: crypto skcipher algo selftests Date: Wed, 29 Nov 2023 09:33:12 -0800 Message-ID: <20231129173312.31008-3-vadfed@meta.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20231129173312.31008-1-vadfed@meta.com> References: <20231129173312.31008-1-vadfed@meta.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: tyyLe2lkeEbrN4KGo5Cgwr3WrGrbZS-E X-Proofpoint-GUID: tyyLe2lkeEbrN4KGo5Cgwr3WrGrbZS-E X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-29_15,2023-11-29_01,2023-05-22_02 X-Patchwork-Delegate: bpf@iogearbox.net Add simple tc hook selftests to show the way to work with new crypto BPF API. Some weird structre and map are added to setup program to make verifier happy about dynptr initialization from memory. Simple AES-ECB algo is used to demonstrate encryption and decryption of fixed size buffers. Signed-off-by: Vadim Fedorenko --- v5 -> v6: - use AF_ALG socket to confirm proper algorithm test - adjust test kernel config to include AF_ALG v4 -> v5: - adjust selftests to use new naming - restore tests on aarch64 and s390 as no sg lists are used v3 -> v4: - adjust selftests to use new syntax of helpers - add tests for acquire and release v2 -> v3: - disable tests on s390 and aarch64 because of unknown Fatal exception in sg_init_one v1 -> v2: - add CONFIG_CRYPTO_AES and CONFIG_CRYPTO_ECB to selftest build config suggested by Daniel --- tools/testing/selftests/bpf/config | 5 + .../selftests/bpf/prog_tests/crypto_sanity.c | 215 ++++++++++++++++++ .../selftests/bpf/progs/crypto_common.h | 67 ++++++ .../selftests/bpf/progs/crypto_sanity.c | 192 ++++++++++++++++ 4 files changed, 479 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/crypto_sanity.c create mode 100644 tools/testing/selftests/bpf/progs/crypto_common.h create mode 100644 tools/testing/selftests/bpf/progs/crypto_sanity.c diff --git a/tools/testing/selftests/bpf/config b/tools/testing/selftests/bpf/config index 3ec5927ec3e5..6963d6192975 100644 --- a/tools/testing/selftests/bpf/config +++ b/tools/testing/selftests/bpf/config @@ -13,7 +13,12 @@ CONFIG_BPF_SYSCALL=y CONFIG_CGROUP_BPF=y CONFIG_CRYPTO_HMAC=y CONFIG_CRYPTO_SHA256=y +CONFIG_CRYPTO_USER_API=y CONFIG_CRYPTO_USER_API_HASH=y +CONFIG_CRYPTO_USER_API_SKCIPHER=y +CONFIG_CRYPTO_SKCIPHER=y +CONFIG_CRYPTO_ECB=y +CONFIG_CRYPTO_AES=y CONFIG_DEBUG_INFO=y CONFIG_DEBUG_INFO_BTF=y CONFIG_DEBUG_INFO_DWARF4=y diff --git a/tools/testing/selftests/bpf/prog_tests/crypto_sanity.c b/tools/testing/selftests/bpf/prog_tests/crypto_sanity.c new file mode 100644 index 000000000000..2dd73cb248be --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/crypto_sanity.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ + +#include +#include +#include +#include +#include + +#include "test_progs.h" +#include "network_helpers.h" +#include "crypto_sanity.skel.h" + +#define NS_TEST "crypto_sanity_ns" +#define IPV6_IFACE_ADDR "face::1" +#define UDP_TEST_PORT 7777 +static const unsigned char crypto_key[] = "testtest12345678"; +static const char plain_text[] = "stringtoencrypt0"; +static int opfd, tfmfd; + +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; +} + +void deinit_afalg(void) +{ + if (tfmfd) + close(tfmfd); + if (opfd) + close(opfd); +} + +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_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, + .repeat = 1, + ); + 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; + + skel = crypto_sanity__open(); + if (!ASSERT_OK_PTR(skel, "skel open")) + return; + + bpf_program__set_autoload(skel->progs.crypto_accuire, true); + + err = crypto_sanity__load(skel); + if (!ASSERT_ERR(err, "crypto_accuire unexpected load success")) + goto fail; + + crypto_sanity__destroy(skel); + + skel = crypto_sanity__open(); + if (!ASSERT_OK_PTR(skel, "skel open")) + return; + + bpf_program__set_autoload(skel->progs.crypto_accuire, false); + + 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); + + err = crypto_sanity__load(skel); + if (!ASSERT_OK(err, "crypto_sanity__load")) + goto fail; + + 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; + + err = crypto_sanity__attach(skel); + if (!ASSERT_OK(err, "crypto_sanity__attach")) + goto fail; + + pfd = bpf_program__fd(skel->progs.crypto_release); + if (!ASSERT_GT(pfd, 0, "crypto_release fd")) + goto fail; + + err = bpf_prog_test_run_opts(pfd, &opts); + if (!ASSERT_OK(err, "crypto_release") || + !ASSERT_OK(opts.retval, "crypto_release retval")) + goto fail; + + 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, 16, 0, (void *)&addr, addrlen); + close(sockfd); + if (!ASSERT_EQ(err, 16, "encrypt send")) + goto fail; + + do_crypt_afalg(plain_text, afalg_dst, 16, true); + + bpf_tc_detach(&qdisc_hook, &tc_attach_enc); + 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_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, 16, 0, (void *)&addr, addrlen); + close(sockfd); + if (!ASSERT_EQ(err, 16, "decrypt send")) + goto fail; + + do_crypt_afalg(afalg_dst, afalg_plain, 16, false); + + bpf_tc_detach(&qdisc_hook, &tc_attach_dec); + 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; + +fail: + if (nstoken) { + bpf_tc_hook_destroy(&qdisc_hook); + close_netns(nstoken); + } + deinit_afalg(); + SYS_NOFAIL("ip netns del " NS_TEST " &> /dev/null"); + crypto_sanity__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/crypto_common.h b/tools/testing/selftests/bpf/progs/crypto_common.h new file mode 100644 index 000000000000..260b9a0fb4ed --- /dev/null +++ b/tools/testing/selftests/bpf/progs/crypto_common.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ + +#ifndef _CRYPTO_COMMON_H +#define _CRYPTO_COMMON_H + +#include "errno.h" +#include + +struct bpf_crypto_ctx *bpf_crypto_ctx_create(const char *type__str, const char *algo__str, + const struct bpf_dynptr *pkey, + unsigned int authsize, int *err) __ksym; +struct bpf_crypto_ctx *bpf_crypto_ctx_acquire(struct bpf_crypto_ctx *ctx) __ksym; +void bpf_crypto_ctx_release(struct bpf_crypto_ctx *ctx) __ksym; +int bpf_crypto_encrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src, + struct bpf_dynptr *dst, struct bpf_dynptr *iv) __ksym; +int bpf_crypto_decrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src, + struct bpf_dynptr *dst, struct bpf_dynptr *iv) __ksym; + +struct __crypto_ctx_value { + struct bpf_crypto_ctx __kptr * ctx; +}; + +struct array_map { + __uint(type, BPF_MAP_TYPE_ARRAY); + __type(key, int); + __type(value, struct __crypto_ctx_value); + __uint(max_entries, 1); +} __crypto_ctx_map SEC(".maps"); + +static inline struct __crypto_ctx_value *crypto_ctx_value_lookup(void) +{ + u32 key = 0; + + return bpf_map_lookup_elem(&__crypto_ctx_map, &key); +} + +static inline int crypto_ctx_insert(struct bpf_crypto_ctx *ctx) +{ + struct __crypto_ctx_value local, *v; + struct bpf_crypto_ctx *old; + u32 key = 0; + int err; + + local.ctx = NULL; + err = bpf_map_update_elem(&__crypto_ctx_map, &key, &local, 0); + if (err) { + bpf_crypto_ctx_release(ctx); + return err; + } + + v = bpf_map_lookup_elem(&__crypto_ctx_map, &key); + if (!v) { + bpf_crypto_ctx_release(ctx); + return -ENOENT; + } + + old = bpf_kptr_xchg(&v->ctx, ctx); + if (old) { + bpf_crypto_ctx_release(old); + return -EEXIST; + } + + return 0; +} + +#endif /* _CRYPTO_COMMON_H */ diff --git a/tools/testing/selftests/bpf/progs/crypto_sanity.c b/tools/testing/selftests/bpf/progs/crypto_sanity.c new file mode 100644 index 000000000000..f566ff189b7e --- /dev/null +++ b/tools/testing/selftests/bpf/progs/crypto_sanity.c @@ -0,0 +1,192 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ + +#include "vmlinux.h" +#include "bpf_tracing_net.h" +#include +#include +#include +#include "bpf_misc.h" +#include "bpf_kfuncs.h" +#include "crypto_common.h" + +#define UDP_TEST_PORT 7777 +unsigned char crypto_key[16] = "testtest12345678"; +char dst[32] = {}; +int status; + +static int skb_dynptr_validate(struct __sk_buff *skb, struct bpf_dynptr *psrc) +{ + struct ipv6hdr ip6h; + struct udphdr udph; + u32 offset; + + if (skb->protocol != __bpf_constant_htons(ETH_P_IPV6)) + return -1; + + if (bpf_skb_load_bytes(skb, ETH_HLEN, &ip6h, sizeof(ip6h))) + return -1; + + if (ip6h.nexthdr != IPPROTO_UDP) + return -1; + + if (bpf_skb_load_bytes(skb, ETH_HLEN + sizeof(ip6h), &udph, sizeof(udph))) + return -1; + + if (udph.dest != __bpf_constant_htons(UDP_TEST_PORT)) + return -1; + + offset = ETH_HLEN + sizeof(ip6h) + sizeof(udph); + if (skb->len < offset + 16) + return -1; + + bpf_dynptr_from_skb(skb, 0, psrc); + bpf_dynptr_adjust(psrc, offset, offset + 16); + + return 0; +} + +SEC("fentry.s/bpf_fentry_test1") +int BPF_PROG(skb_crypto_setup) +{ + struct bpf_crypto_ctx *cctx; + struct bpf_dynptr key = {}; + int err = 0; + + status = 0; + + bpf_dynptr_from_mem(crypto_key, sizeof(crypto_key), 0, &key); + cctx = bpf_crypto_ctx_create("skcipher", "ecb(aes)", &key, 0, &err); + + if (!cctx) { + status = err; + return 0; + } + + err = crypto_ctx_insert(cctx); + if (err && err != -EEXIST) + status = err; + + return 0; +} + +SEC("fentry.s/bpf_fentry_test1") +int BPF_PROG(crypto_release) +{ + struct bpf_crypto_ctx *cctx; + struct bpf_dynptr key = {}; + int err = 0; + + status = 0; + + bpf_dynptr_from_mem(crypto_key, sizeof(crypto_key), 0, &key); + cctx = bpf_crypto_ctx_create("skcipher", "ecb(aes)", &key, 0, &err); + + if (!cctx) { + status = err; + return 0; + } + + bpf_crypto_ctx_release(cctx); + + return 0; +} + +SEC("?fentry.s/bpf_fentry_test1") +__failure __msg("Unreleased reference") +int BPF_PROG(crypto_accuire) +{ + struct bpf_crypto_ctx *cctx; + struct bpf_dynptr key = {}; + int err = 0; + + status = 0; + + bpf_dynptr_from_mem(crypto_key, sizeof(crypto_key), 0, &key); + cctx = bpf_crypto_ctx_create("skcipher", "ecb(aes)", &key, 0, &err); + + if (!cctx) { + status = err; + return 0; + } + + cctx = bpf_crypto_ctx_acquire(cctx); + if (!cctx) + return -EINVAL; + + bpf_crypto_ctx_release(cctx); + + return 0; +} + +SEC("tc") +int decrypt_sanity(struct __sk_buff *skb) +{ + struct __crypto_ctx_value *v; + struct bpf_crypto_ctx *ctx; + struct bpf_dynptr psrc, pdst, iv; + int err; + + err = skb_dynptr_validate(skb, &psrc); + if (err < 0) { + status = err; + return TC_ACT_SHOT; + } + + v = crypto_ctx_value_lookup(); + if (!v) { + status = -ENOENT; + return TC_ACT_SHOT; + } + + ctx = v->ctx; + if (!ctx) { + status = -ENOENT; + return TC_ACT_SHOT; + } + + bpf_dynptr_from_mem(dst, sizeof(dst), 0, &pdst); + bpf_dynptr_from_mem(dst, 0, 0, &iv); + + status = bpf_crypto_decrypt(ctx, &psrc, &pdst, &iv); + + return TC_ACT_SHOT; +} + +SEC("tc") +int encrypt_sanity(struct __sk_buff *skb) +{ + struct __crypto_ctx_value *v; + struct bpf_crypto_ctx *ctx; + struct bpf_dynptr psrc, pdst, iv; + int err; + + status = 0; + + err = skb_dynptr_validate(skb, &psrc); + if (err < 0) { + status = err; + return TC_ACT_SHOT; + } + + v = crypto_ctx_value_lookup(); + if (!v) { + status = -ENOENT; + return TC_ACT_SHOT; + } + + ctx = v->ctx; + if (!ctx) { + status = -ENOENT; + return TC_ACT_SHOT; + } + + bpf_dynptr_from_mem(dst, sizeof(dst), 0, &pdst); + bpf_dynptr_from_mem(dst, 0, 0, &iv); + + status = bpf_crypto_encrypt(ctx, &psrc, &pdst, &iv); + + return TC_ACT_SHOT; +} + +char __license[] SEC("license") = "GPL";