tools/testing/selftests/bpf/prog_tests/crypto_sanity.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
   3
   4 #include <sys/types.h>
   5 #include <sys/socket.h>
   6 #include <net/if.h>
   7 #include <linux/if_alg.h>
   8
   9 #include "test_progs.h"
  10 #include "network_helpers.h"
  11 #include "crypto_sanity.skel.h"
  12 #include "crypto_basic.skel.h"
  13
  14 #define NS_TEST "crypto_sanity_ns"
  15 #define IPV6_IFACE_ADDR "face::1"
  16 static const unsigned char crypto_key[] = "testtest12345678";
  17 static const char plain_text[] = "stringtoencrypt0";
  18 static int opfd = -1, tfmfd = -1;
  19 static const char algo[] = "ecb(aes)";
  20 static int init_afalg(void)
  21 {
  22         struct sockaddr_alg sa = {
  23                 .salg_family = AF_ALG,
  24                 .salg_type = "skcipher",
  25                 .salg_name = "ecb(aes)"
  26         };
  27
  28         tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
  29         if (tfmfd == -1)
  30                 return errno;
  31         if (bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa)) == -1)
  32                 return errno;
  33         if (setsockopt(tfmfd, SOL_ALG, ALG_SET_KEY, crypto_key, 16) == -1)
  34                 return errno;
  35         opfd = accept(tfmfd, NULL, 0);
  36         if (opfd == -1)
  37                 return errno;
  38         return 0;
  39 }
  40
  41 static void deinit_afalg(void)
  42 {
  43         if (tfmfd != -1)
  44                 close(tfmfd);
  45         if (opfd != -1)
  46                 close(opfd);
  47 }
  48
  49 static void do_crypt_afalg(const void *src, void *dst, int size, bool encrypt)
  50 {
  51         struct msghdr msg = {};
  52         struct cmsghdr *cmsg;
  53         char cbuf[CMSG_SPACE(4)] = {0};
  54         struct iovec iov;
  55
  56         msg.msg_control = cbuf;
  57         msg.msg_controllen = sizeof(cbuf);
  58
  59         cmsg = CMSG_FIRSTHDR(&msg);
  60         cmsg->cmsg_level = SOL_ALG;
  61         cmsg->cmsg_type = ALG_SET_OP;
  62         cmsg->cmsg_len = CMSG_LEN(4);
  63         *(__u32 *)CMSG_DATA(cmsg) = encrypt ? ALG_OP_ENCRYPT : ALG_OP_DECRYPT;
  64
  65         iov.iov_base = (char *)src;
  66         iov.iov_len = size;
  67
  68         msg.msg_iov = &iov;
  69         msg.msg_iovlen = 1;
  70
  71         sendmsg(opfd, &msg, 0);
  72         read(opfd, dst, size);
  73 }
  74
  75 void test_crypto_basic(void)
  76 {
  77         RUN_TESTS(crypto_basic);
  78 }
  79
  80 void test_crypto_sanity(void)
  81 {
  82         LIBBPF_OPTS(bpf_tc_hook, qdisc_hook, .attach_point = BPF_TC_EGRESS);
  83         LIBBPF_OPTS(bpf_tc_opts, tc_attach_enc);
  84         LIBBPF_OPTS(bpf_tc_opts, tc_attach_dec);
  85         LIBBPF_OPTS(bpf_test_run_opts, opts);
  86         struct nstoken *nstoken = NULL;
  87         struct crypto_sanity *skel;
  88         char afalg_plain[16] = {0};
  89         char afalg_dst[16] = {0};
  90         struct sockaddr_in6 addr;
  91         int sockfd, err, pfd;
  92         socklen_t addrlen;
  93         u16 udp_test_port;
  94
  95         skel = crypto_sanity__open_and_load();
  96         if (!ASSERT_OK_PTR(skel, "skel open"))
  97                 return;
  98
  99         SYS(fail, "ip netns add %s", NS_TEST);
 100         SYS(fail, "ip -net %s -6 addr add %s/128 dev lo nodad", NS_TEST, IPV6_IFACE_ADDR);
 101         SYS(fail, "ip -net %s link set dev lo up", NS_TEST);
 102
 103         nstoken = open_netns(NS_TEST);
 104         if (!ASSERT_OK_PTR(nstoken, "open_netns"))
 105                 goto fail;
 106
 107         err = init_afalg();
 108         if (!ASSERT_OK(err, "AF_ALG init fail"))
 109                 goto fail;
 110
 111         qdisc_hook.ifindex = if_nametoindex("lo");
 112         if (!ASSERT_GT(qdisc_hook.ifindex, 0, "if_nametoindex lo"))
 113                 goto fail;
 114
 115         skel->bss->key_len = 16;
 116         skel->bss->authsize = 0;
 117         udp_test_port = skel->data->udp_test_port;
 118         memcpy(skel->bss->key, crypto_key, sizeof(crypto_key));
 119         snprintf(skel->bss->algo, 128, "%s", algo);
 120         pfd = bpf_program__fd(skel->progs.skb_crypto_setup);
 121         if (!ASSERT_GT(pfd, 0, "skb_crypto_setup fd"))
 122                 goto fail;
 123
 124         err = bpf_prog_test_run_opts(pfd, &opts);
 125         if (!ASSERT_OK(err, "skb_crypto_setup") ||
 126             !ASSERT_OK(opts.retval, "skb_crypto_setup retval"))
 127                 goto fail;
 128
 129         if (!ASSERT_OK(skel->bss->status, "skb_crypto_setup status"))
 130                 goto fail;
 131
 132         err = bpf_tc_hook_create(&qdisc_hook);
 133         if (!ASSERT_OK(err, "create qdisc hook"))
 134                 goto fail;
 135
 136         addrlen = sizeof(addr);
 137         err = make_sockaddr(AF_INET6, IPV6_IFACE_ADDR, udp_test_port,
 138                             (void *)&addr, &addrlen);
 139         if (!ASSERT_OK(err, "make_sockaddr"))
 140                 goto fail;
 141
 142         tc_attach_enc.prog_fd = bpf_program__fd(skel->progs.encrypt_sanity);
 143         err = bpf_tc_attach(&qdisc_hook, &tc_attach_enc);
 144         if (!ASSERT_OK(err, "attach encrypt filter"))
 145                 goto fail;
 146
 147         sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
 148         if (!ASSERT_NEQ(sockfd, -1, "encrypt socket"))
 149                 goto fail;
 150         err = sendto(sockfd, plain_text, sizeof(plain_text), 0, (void *)&addr, addrlen);
 151         close(sockfd);
 152         if (!ASSERT_EQ(err, sizeof(plain_text), "encrypt send"))
 153                 goto fail;
 154
 155         do_crypt_afalg(plain_text, afalg_dst, sizeof(afalg_dst), true);
 156
 157         if (!ASSERT_OK(skel->bss->status, "encrypt status"))
 158                 goto fail;
 159         if (!ASSERT_STRNEQ(skel->bss->dst, afalg_dst, sizeof(afalg_dst), "encrypt AF_ALG"))
 160                 goto fail;
 161
 162         tc_attach_enc.flags = tc_attach_enc.prog_fd = tc_attach_enc.prog_id = 0;
 163         err = bpf_tc_detach(&qdisc_hook, &tc_attach_enc);
 164         if (!ASSERT_OK(err, "bpf_tc_detach encrypt"))
 165                 goto fail;
 166
 167         tc_attach_dec.prog_fd = bpf_program__fd(skel->progs.decrypt_sanity);
 168         err = bpf_tc_attach(&qdisc_hook, &tc_attach_dec);
 169         if (!ASSERT_OK(err, "attach decrypt filter"))
 170                 goto fail;
 171
 172         sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
 173         if (!ASSERT_NEQ(sockfd, -1, "decrypt socket"))
 174                 goto fail;
 175         err = sendto(sockfd, afalg_dst, sizeof(afalg_dst), 0, (void *)&addr, addrlen);
 176         close(sockfd);
 177         if (!ASSERT_EQ(err, sizeof(afalg_dst), "decrypt send"))
 178                 goto fail;
 179
 180         do_crypt_afalg(afalg_dst, afalg_plain, sizeof(afalg_plain), false);
 181
 182         if (!ASSERT_OK(skel->bss->status, "decrypt status"))
 183                 goto fail;
 184         if (!ASSERT_STRNEQ(skel->bss->dst, afalg_plain, sizeof(afalg_plain), "decrypt AF_ALG"))
 185                 goto fail;
 186
 187         tc_attach_dec.flags = tc_attach_dec.prog_fd = tc_attach_dec.prog_id = 0;
 188         err = bpf_tc_detach(&qdisc_hook, &tc_attach_dec);
 189         ASSERT_OK(err, "bpf_tc_detach decrypt");
 190
 191 fail:
 192         close_netns(nstoken);
 193         deinit_afalg();
 194         SYS_NOFAIL("ip netns del " NS_TEST " &> /dev/null");
 195         crypto_sanity__destroy(skel);
 196 }