1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2022-2024 Gleb Smirnoff <glebius@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/socket.h> 29 #include <netinet/in.h> 30 #include <errno.h> 31 #include <fcntl.h> 32 #include <stdlib.h> 33 34 #include <atf-c.h> 35 36 static int 37 listensock(struct sockaddr_in *sin) 38 { 39 int l; 40 41 ATF_REQUIRE((l = socket(PF_INET, SOCK_STREAM, 0)) > 0); 42 ATF_REQUIRE(fcntl(l, F_SETFL, O_NONBLOCK) != -1); 43 ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_REUSEADDR, &(socklen_t){1}, 44 sizeof(int)) == 0); 45 *sin = (struct sockaddr_in){ 46 .sin_len = sizeof(sin), 47 .sin_family = AF_INET, 48 .sin_addr.s_addr = htonl(INADDR_LOOPBACK), 49 }; 50 ATF_REQUIRE(bind(l, (struct sockaddr *)sin, sizeof(*sin)) == 0); 51 ATF_REQUIRE(getsockname(l, (struct sockaddr *)sin, 52 &(socklen_t){ sizeof(*sin) }) == 0); 53 ATF_REQUIRE(listen(l, -1) == 0); 54 55 return (l); 56 } 57 58 static int 59 clientsock(struct sockaddr_in *sin) 60 { 61 int s; 62 63 ATF_REQUIRE((s = socket(PF_INET, SOCK_STREAM, 0)) > 0); 64 ATF_REQUIRE(connect(s, (struct sockaddr *)sin, sizeof(*sin)) == 0); 65 66 return (s); 67 } 68 69 static void 70 accfon(int l, struct accept_filter_arg *af) 71 { 72 73 if (setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, af, sizeof(*af)) != 0) { 74 if (errno == ENOENT) 75 atf_tc_skip("Accept filter %s not loaded in kernel", 76 af->af_name); 77 else 78 atf_tc_fail("setsockopt(SO_ACCEPTFILTER): %s", 79 strerror(errno)); 80 } 81 } 82 83 /* 84 * XXX: return from send(2) on a localhost connection doesn't guarantee that 85 * netisr has fully processed and delivered the data to the remote local 86 * socket. Sleep a fraction of second to "guarantee" that it did. 87 */ 88 static ssize_t 89 usend(int s, const void *msg, size_t len) 90 { 91 ssize_t rv; 92 93 rv = send(s, msg, len, 0); 94 usleep(100000); 95 return (rv); 96 } 97 98 ATF_TC_WITHOUT_HEAD(data); 99 ATF_TC_BODY(data, tc) 100 { 101 struct accept_filter_arg afa = { 102 .af_name = "dataready" 103 }; 104 struct sockaddr_in sin; 105 int l, s, a; 106 107 l = listensock(&sin); 108 accfon(l, &afa); 109 s = clientsock(&sin); 110 ATF_REQUIRE(accept(l, NULL, 0) == -1); 111 ATF_REQUIRE(errno == EAGAIN); 112 ATF_REQUIRE(usend(s, "foo", sizeof("foo")) == sizeof("foo")); 113 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 114 } 115 116 ATF_TC_WITHOUT_HEAD(http); 117 ATF_TC_BODY(http, tc) 118 { 119 struct accept_filter_arg afa = { 120 .af_name = "httpready" 121 }; 122 struct sockaddr_in sin; 123 int l, s, a; 124 125 l = listensock(&sin); 126 accfon(l, &afa); 127 s = clientsock(&sin); 128 129 /* 1) No data. */ 130 ATF_REQUIRE(accept(l, NULL, 0) == -1); 131 ATF_REQUIRE(errno == EAGAIN); 132 133 /* 2) Data, that doesn't look like HTTP. */ 134 ATF_REQUIRE(usend(s, "foo", sizeof("foo")) == sizeof("foo")); 135 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 136 137 close(s); 138 close(a); 139 140 #define CHUNK1 "GET / " 141 #define CHUNK2 "HTTP/1.0\r\n\n" 142 #define LEN(c) (sizeof(c) - 1) 143 144 /* 3) Partial HTTP. */ 145 s = clientsock(&sin); 146 ATF_REQUIRE(usend(s, CHUNK1, LEN(CHUNK1)) == LEN(CHUNK1)); 147 ATF_REQUIRE(accept(l, NULL, 0) == -1); 148 ATF_REQUIRE(errno == EAGAIN); 149 150 /* 4) Complete HTTP. */ 151 ATF_REQUIRE(usend(s, CHUNK2, LEN(CHUNK2)) == LEN(CHUNK2)); 152 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 153 } 154 155 ATF_TC_WITHOUT_HEAD(tls); 156 ATF_TC_BODY(tls, tc) 157 { 158 struct accept_filter_arg afa = { 159 .af_name = "tlsready" 160 }; 161 struct sockaddr_in sin; 162 int l, s, a; 163 164 l = listensock(&sin); 165 accfon(l, &afa); 166 s = clientsock(&sin); 167 168 /* 1) No data. */ 169 ATF_REQUIRE(accept(l, NULL, 0) == -1); 170 ATF_REQUIRE(errno == EAGAIN); 171 172 /* 2) Less than 5 bytes. */ 173 ATF_REQUIRE(usend(s, "foo", sizeof("foo")) == sizeof("foo")); 174 ATF_REQUIRE(errno == EAGAIN); 175 176 /* 3) Something that doesn't look like TLS handshake. */ 177 ATF_REQUIRE(usend(s, "bar", sizeof("bar")) == sizeof("bar")); 178 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 179 180 close(s); 181 close(a); 182 183 /* 4) Partial TLS record. */ 184 s = clientsock(&sin); 185 struct { 186 uint8_t type; 187 uint16_t version; 188 uint16_t length; 189 } __attribute__((__packed__)) header = { 190 .type = 0x16, 191 .length = htons((uint16_t)(arc4random() % 16384)), 192 }; 193 _Static_assert(sizeof(header) == 5, ""); 194 ATF_REQUIRE(usend(s, &header, sizeof(header)) == sizeof(header)); 195 ssize_t sent = 0; 196 do { 197 size_t len; 198 char *buf; 199 200 ATF_REQUIRE(accept(l, NULL, 0) == -1); 201 ATF_REQUIRE(errno == EAGAIN); 202 203 len = arc4random() % 1024; 204 buf = alloca(len); 205 ATF_REQUIRE(usend(s, buf, len) == (ssize_t)len); 206 sent += len; 207 } while (sent < ntohs(header.length)); 208 /* TLS header with bytes >= declared length. */ 209 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 210 } 211 212 /* Check changing to a different filter. */ 213 ATF_TC_WITHOUT_HEAD(change); 214 ATF_TC_BODY(change, tc) 215 { 216 struct accept_filter_arg dfa = { 217 .af_name = "dataready" 218 }; 219 struct accept_filter_arg hfa = { 220 .af_name = "httpready" 221 }; 222 struct sockaddr_in sin; 223 int n, l; 224 225 l = listensock(&sin); 226 accfon(l, &dfa); 227 228 /* Refuse to change filter without explicit removal of the old one. */ 229 ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, &hfa, 230 sizeof(hfa)) != 0 && errno == EBUSY); 231 232 /* But allow after clearing. */ 233 ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, NULL, 0) == 0); 234 ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, &hfa, 235 sizeof(hfa)) == 0); 236 237 /* Must be listening socket. */ 238 ATF_REQUIRE((n = socket(PF_INET, SOCK_STREAM, 0)) > 0); 239 ATF_REQUIRE(setsockopt(n, SOL_SOCKET, SO_ACCEPTFILTER, &dfa, 240 sizeof(dfa)) != 0 && errno == EINVAL); 241 } 242 243 ATF_TP_ADD_TCS(tp) 244 { 245 ATF_TP_ADD_TC(tp, data); 246 ATF_TP_ADD_TC(tp, http); 247 ATF_TP_ADD_TC(tp, tls); 248 ATF_TP_ADD_TC(tp, change); 249 250 return (atf_no_error()); 251 } 252