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 }
197
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