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 if (setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, af, sizeof(*af)) != 0) { 73 atf_tc_fail("setsockopt(SO_ACCEPTFILTER): %s", strerror(errno)); 74 } 75 } 76 77 /* 78 * XXX: return from send(2) on a localhost connection doesn't guarantee that 79 * netisr has fully processed and delivered the data to the remote local 80 * socket. Sleep a fraction of second to "guarantee" that it did. 81 */ 82 static ssize_t 83 usend(int s, const void *msg, size_t len) 84 { 85 ssize_t rv; 86 87 rv = send(s, msg, len, 0); 88 usleep(100000); 89 return (rv); 90 } 91 92 ATF_TC(data); 93 ATF_TC_HEAD(data, tc) 94 { 95 atf_tc_set_md_var(tc, "require.kmods", "accf_data"); 96 } 97 ATF_TC_BODY(data, tc) 98 { 99 struct accept_filter_arg afa = { 100 .af_name = "dataready" 101 }; 102 struct sockaddr_in sin; 103 int l, s, a; 104 105 l = listensock(&sin); 106 accfon(l, &afa); 107 s = clientsock(&sin); 108 ATF_REQUIRE(accept(l, NULL, 0) == -1); 109 ATF_REQUIRE(errno == EAGAIN); 110 ATF_REQUIRE(usend(s, "foo", sizeof("foo")) == sizeof("foo")); 111 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 112 } 113 114 ATF_TC(http); 115 ATF_TC_HEAD(http, tc) 116 { 117 atf_tc_set_md_var(tc, "require.kmods", "accf_http"); 118 } 119 ATF_TC_BODY(http, tc) 120 { 121 struct accept_filter_arg afa = { 122 .af_name = "httpready" 123 }; 124 struct sockaddr_in sin; 125 int l, s, a; 126 127 l = listensock(&sin); 128 accfon(l, &afa); 129 s = clientsock(&sin); 130 131 /* 1) No data. */ 132 ATF_REQUIRE(accept(l, NULL, 0) == -1); 133 ATF_REQUIRE(errno == EAGAIN); 134 135 /* 2) Data, that doesn't look like HTTP. */ 136 ATF_REQUIRE(usend(s, "foo", sizeof("foo")) == sizeof("foo")); 137 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 138 139 close(s); 140 close(a); 141 142 #define CHUNK1 "GET / " 143 #define CHUNK2 "HTTP/1.0\r\n\n" 144 #define LEN(c) (sizeof(c) - 1) 145 146 /* 3) Partial HTTP. */ 147 s = clientsock(&sin); 148 ATF_REQUIRE(usend(s, CHUNK1, LEN(CHUNK1)) == LEN(CHUNK1)); 149 ATF_REQUIRE(accept(l, NULL, 0) == -1); 150 ATF_REQUIRE(errno == EAGAIN); 151 152 /* 4) Complete HTTP. */ 153 ATF_REQUIRE(usend(s, CHUNK2, LEN(CHUNK2)) == LEN(CHUNK2)); 154 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 155 } 156 157 ATF_TC(tls); 158 ATF_TC_HEAD(tls, tc) 159 { 160 atf_tc_set_md_var(tc, "require.kmods", "accf_tls"); 161 } 162 ATF_TC_BODY(tls, tc) 163 { 164 struct accept_filter_arg afa = { 165 .af_name = "tlsready" 166 }; 167 struct sockaddr_in sin; 168 int l, s, a; 169 170 l = listensock(&sin); 171 accfon(l, &afa); 172 s = clientsock(&sin); 173 174 /* 1) No data. */ 175 ATF_REQUIRE(accept(l, NULL, 0) == -1); 176 ATF_REQUIRE(errno == EAGAIN); 177 178 /* 2) Less than 5 bytes. */ 179 ATF_REQUIRE(usend(s, "foo", sizeof("foo")) == sizeof("foo")); 180 ATF_REQUIRE(errno == EAGAIN); 181 182 /* 3) Something that doesn't look like TLS handshake. */ 183 ATF_REQUIRE(usend(s, "bar", sizeof("bar")) == sizeof("bar")); 184 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 185 186 close(s); 187 close(a); 188 189 /* 4) Partial TLS record. */ 190 s = clientsock(&sin); 191 struct { 192 uint8_t type; 193 uint16_t version; 194 uint16_t length; 195 } __attribute__((__packed__)) header = { 196 .type = 0x16, 197 .length = htons((uint16_t)(arc4random() % 16384)), 198 }; 199 _Static_assert(sizeof(header) == 5, ""); 200 ATF_REQUIRE(usend(s, &header, sizeof(header)) == sizeof(header)); 201 ssize_t sent = 0; 202 do { 203 size_t len; 204 char *buf; 205 206 ATF_REQUIRE(accept(l, NULL, 0) == -1); 207 ATF_REQUIRE(errno == EAGAIN); 208 209 len = arc4random() % 1024; 210 buf = alloca(len); 211 ATF_REQUIRE(usend(s, buf, len) == (ssize_t)len); 212 sent += len; 213 } while (sent < ntohs(header.length)); 214 /* TLS header with bytes >= declared length. */ 215 ATF_REQUIRE((a = accept(l, NULL, 0)) > 0); 216 } 217 218 /* Check changing to a different filter. */ 219 ATF_TC(change); 220 ATF_TC_HEAD(change, tc) 221 { 222 atf_tc_set_md_var(tc, "require.kmods", "accf_data accf_http"); 223 } 224 ATF_TC_BODY(change, tc) 225 { 226 struct accept_filter_arg dfa = { 227 .af_name = "dataready" 228 }; 229 struct accept_filter_arg hfa = { 230 .af_name = "httpready" 231 }; 232 struct sockaddr_in sin; 233 int n, l; 234 235 l = listensock(&sin); 236 accfon(l, &dfa); 237 238 /* Refuse to change filter without explicit removal of the old one. */ 239 ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, &hfa, 240 sizeof(hfa)) != 0 && errno == EBUSY); 241 242 /* But allow after clearing. */ 243 ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, NULL, 0) == 0); 244 ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_ACCEPTFILTER, &hfa, 245 sizeof(hfa)) == 0); 246 247 /* Must be listening socket. */ 248 ATF_REQUIRE((n = socket(PF_INET, SOCK_STREAM, 0)) > 0); 249 ATF_REQUIRE(setsockopt(n, SOL_SOCKET, SO_ACCEPTFILTER, &dfa, 250 sizeof(dfa)) != 0 && errno == EINVAL); 251 } 252 253 ATF_TP_ADD_TCS(tp) 254 { 255 ATF_TP_ADD_TC(tp, data); 256 ATF_TP_ADD_TC(tp, http); 257 ATF_TP_ADD_TC(tp, tls); 258 ATF_TP_ADD_TC(tp, change); 259 260 return (atf_no_error()); 261 } 262