| File: | src/usr.sbin/ntpd/constraint.c |
| Warning: | line 240, column 7 Although the value stored to 'cstr' is used in the enclosing expression, the value is never actually read from 'cstr' |
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| 1 | /* $OpenBSD: constraint.c,v 1.56 2023/12/20 15:36:36 otto Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2015 Reyk Floeter <reyk@openbsd.org> |
| 5 | * |
| 6 | * Permission to use, copy, modify, and distribute this software for any |
| 7 | * purpose with or without fee is hereby granted, provided that the above |
| 8 | * copyright notice and this permission notice appear in all copies. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #include <sys/queue.h> |
| 20 | #include <sys/socket.h> |
| 21 | #include <sys/time.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/wait.h> |
| 24 | #include <sys/resource.h> |
| 25 | #include <sys/uio.h> |
| 26 | |
| 27 | #include <netinet/in.h> |
| 28 | #include <arpa/inet.h> |
| 29 | |
| 30 | #include <errno(*__errno()).h> |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <fcntl.h> |
| 34 | #include <imsg.h> |
| 35 | #include <netdb.h> |
| 36 | #include <poll.h> |
| 37 | #include <signal.h> |
| 38 | #include <string.h> |
| 39 | #include <unistd.h> |
| 40 | #include <time.h> |
| 41 | #include <ctype.h> |
| 42 | #include <tls.h> |
| 43 | #include <pwd.h> |
| 44 | #include <math.h> |
| 45 | |
| 46 | #include "ntpd.h" |
| 47 | |
| 48 | #define IMF_FIXDATE"%a, %d %h %Y %T GMT" "%a, %d %h %Y %T GMT" |
| 49 | #define X509_DATE"%Y-%m-%d %T UTC" "%Y-%m-%d %T UTC" |
| 50 | |
| 51 | int constraint_addr_init(struct constraint *); |
| 52 | void constraint_addr_head_clear(struct constraint *); |
| 53 | struct constraint * |
| 54 | constraint_byid(u_int32_t); |
| 55 | struct constraint * |
| 56 | constraint_byfd(int); |
| 57 | struct constraint * |
| 58 | constraint_bypid(pid_t); |
| 59 | int constraint_close(u_int32_t); |
| 60 | void constraint_update(void); |
| 61 | int constraint_cmp(const void *, const void *); |
| 62 | |
| 63 | void priv_constraint_close(int, int); |
| 64 | void priv_constraint_readquery(struct constraint *, struct ntp_addr_msg *, |
| 65 | uint8_t **); |
| 66 | |
| 67 | struct httpsdate * |
| 68 | httpsdate_init(const char *, const char *, const char *, |
| 69 | const char *, const u_int8_t *, size_t, int); |
| 70 | void httpsdate_free(void *); |
| 71 | int httpsdate_request(struct httpsdate *, struct timeval *, int); |
| 72 | void *httpsdate_query(const char *, const char *, const char *, |
| 73 | const char *, const u_int8_t *, size_t, |
| 74 | struct timeval *, struct timeval *, int); |
| 75 | |
| 76 | char *tls_readline(struct tls *, size_t *, size_t *, struct timeval *); |
| 77 | |
| 78 | u_int constraint_cnt; |
| 79 | extern u_int peer_cnt; |
| 80 | extern struct imsgbuf *ibuf; /* priv */ |
| 81 | extern struct imsgbuf *ibuf_main; /* chld */ |
| 82 | |
| 83 | struct httpsdate { |
| 84 | char *tls_addr; |
| 85 | char *tls_port; |
| 86 | char *tls_hostname; |
| 87 | char *tls_path; |
| 88 | char *tls_request; |
| 89 | struct tls_config *tls_config; |
| 90 | struct tls *tls_ctx; |
| 91 | struct tm tls_tm; |
| 92 | }; |
| 93 | |
| 94 | int |
| 95 | constraint_init(struct constraint *cstr) |
| 96 | { |
| 97 | cstr->state = STATE_NONE; |
| 98 | cstr->fd = -1; |
| 99 | cstr->last = getmonotime(); |
| 100 | cstr->constraint = 0; |
| 101 | cstr->senderrors = 0; |
| 102 | |
| 103 | return (constraint_addr_init(cstr)); |
| 104 | } |
| 105 | |
| 106 | int |
| 107 | constraint_addr_init(struct constraint *cstr) |
| 108 | { |
| 109 | struct sockaddr_in *sa_in; |
| 110 | struct sockaddr_in6 *sa_in6; |
| 111 | struct ntp_addr *h; |
| 112 | |
| 113 | if (cstr->state == STATE_DNS_INPROGRESS) |
| 114 | return (0); |
| 115 | |
| 116 | if (cstr->addr_head.a == NULL((void *)0)) { |
| 117 | priv_dns(IMSG_CONSTRAINT_DNS, cstr->addr_head.name, cstr->id); |
| 118 | cstr->state = STATE_DNS_INPROGRESS; |
| 119 | return (0); |
| 120 | } |
| 121 | |
| 122 | h = cstr->addr; |
| 123 | switch (h->ss.ss_family) { |
| 124 | case AF_INET2: |
| 125 | sa_in = (struct sockaddr_in *)&h->ss; |
| 126 | if (ntohs(sa_in->sin_port)(__uint16_t)(__builtin_constant_p(sa_in->sin_port) ? (__uint16_t )(((__uint16_t)(sa_in->sin_port) & 0xffU) << 8 | ((__uint16_t)(sa_in->sin_port) & 0xff00U) >> 8) : __swap16md(sa_in->sin_port)) == 0) |
| 127 | sa_in->sin_port = htons(443)(__uint16_t)(__builtin_constant_p(443) ? (__uint16_t)(((__uint16_t )(443) & 0xffU) << 8 | ((__uint16_t)(443) & 0xff00U ) >> 8) : __swap16md(443)); |
| 128 | cstr->state = STATE_DNS_DONE; |
| 129 | break; |
| 130 | case AF_INET624: |
| 131 | sa_in6 = (struct sockaddr_in6 *)&h->ss; |
| 132 | if (ntohs(sa_in6->sin6_port)(__uint16_t)(__builtin_constant_p(sa_in6->sin6_port) ? (__uint16_t )(((__uint16_t)(sa_in6->sin6_port) & 0xffU) << 8 | ((__uint16_t)(sa_in6->sin6_port) & 0xff00U) >> 8) : __swap16md(sa_in6->sin6_port)) == 0) |
| 133 | sa_in6->sin6_port = htons(443)(__uint16_t)(__builtin_constant_p(443) ? (__uint16_t)(((__uint16_t )(443) & 0xffU) << 8 | ((__uint16_t)(443) & 0xff00U ) >> 8) : __swap16md(443)); |
| 134 | cstr->state = STATE_DNS_DONE; |
| 135 | break; |
| 136 | default: |
| 137 | /* XXX king bula sez it? */ |
| 138 | fatalx("wrong AF in constraint_addr_init"); |
| 139 | /* NOTREACHED */ |
| 140 | } |
| 141 | |
| 142 | return (1); |
| 143 | } |
| 144 | |
| 145 | void |
| 146 | constraint_addr_head_clear(struct constraint *cstr) |
| 147 | { |
| 148 | host_dns_free(cstr->addr_head.a); |
| 149 | cstr->addr_head.a = NULL((void *)0); |
| 150 | cstr->addr = NULL((void *)0); |
| 151 | } |
| 152 | |
| 153 | int |
| 154 | constraint_query(struct constraint *cstr, int synced) |
| 155 | { |
| 156 | time_t now; |
| 157 | struct ntp_addr_msg am; |
| 158 | struct iovec iov[3]; |
| 159 | int iov_cnt = 0; |
| 160 | |
| 161 | now = getmonotime(); |
| 162 | |
| 163 | switch (cstr->state) { |
| 164 | case STATE_DNS_DONE: |
| 165 | /* Proceed and query the time */ |
| 166 | break; |
| 167 | case STATE_DNS_TEMPFAIL: |
| 168 | if (now > cstr->last + (cstr->dnstries >= TRIES_AUTO_DNSFAIL4 ? |
| 169 | CONSTRAINT_RETRY_INTERVAL(15) : INTERVAL_AUIO_DNSFAIL1)) { |
| 170 | cstr->dnstries++; |
| 171 | /* Retry resolving the address */ |
| 172 | constraint_init(cstr); |
| 173 | return 0; |
| 174 | } |
| 175 | return (-1); |
| 176 | case STATE_QUERY_SENT: |
| 177 | if (cstr->last + CONSTRAINT_SCAN_TIMEOUT(10) > now) { |
| 178 | /* The caller should expect a reply */ |
| 179 | return (0); |
| 180 | } |
| 181 | |
| 182 | /* Timeout, just kill the process to reset it. */ |
| 183 | imsg_compose(ibuf_main, IMSG_CONSTRAINT_KILL, |
| 184 | cstr->id, 0, -1, NULL((void *)0), 0); |
| 185 | |
| 186 | cstr->state = STATE_TIMEOUT; |
| 187 | return (-1); |
| 188 | case STATE_INVALID: |
| 189 | if (cstr->last + CONSTRAINT_SCAN_INTERVAL(15*60) > now) { |
| 190 | /* Nothing to do */ |
| 191 | return (-1); |
| 192 | } |
| 193 | |
| 194 | /* Reset and retry */ |
| 195 | cstr->senderrors = 0; |
| 196 | constraint_close(cstr->id); |
| 197 | break; |
| 198 | case STATE_REPLY_RECEIVED: |
| 199 | default: |
| 200 | /* Nothing to do */ |
| 201 | return (-1); |
| 202 | } |
| 203 | |
| 204 | cstr->last = now; |
| 205 | cstr->state = STATE_QUERY_SENT; |
| 206 | |
| 207 | memset(&am, 0, sizeof(am)); |
| 208 | memcpy(&am.a, cstr->addr, sizeof(am.a)); |
| 209 | am.synced = synced; |
| 210 | |
| 211 | iov[iov_cnt].iov_base = &am; |
| 212 | iov[iov_cnt++].iov_len = sizeof(am); |
| 213 | if (cstr->addr_head.name) { |
| 214 | am.namelen = strlen(cstr->addr_head.name) + 1; |
| 215 | iov[iov_cnt].iov_base = cstr->addr_head.name; |
| 216 | iov[iov_cnt++].iov_len = am.namelen; |
| 217 | } |
| 218 | if (cstr->addr_head.path) { |
| 219 | am.pathlen = strlen(cstr->addr_head.path) + 1; |
| 220 | iov[iov_cnt].iov_base = cstr->addr_head.path; |
| 221 | iov[iov_cnt++].iov_len = am.pathlen; |
| 222 | } |
| 223 | |
| 224 | imsg_composev(ibuf_main, IMSG_CONSTRAINT_QUERY, |
| 225 | cstr->id, 0, -1, iov, iov_cnt); |
| 226 | |
| 227 | return (0); |
| 228 | } |
| 229 | |
| 230 | void |
| 231 | priv_constraint_msg(u_int32_t id, u_int8_t *data, size_t len, int argc, |
| 232 | char **argv) |
| 233 | { |
| 234 | struct ntp_addr_msg am; |
| 235 | struct ntp_addr *h; |
| 236 | struct constraint *cstr; |
| 237 | int pipes[2]; |
| 238 | int rv; |
| 239 | |
| 240 | if ((cstr = constraint_byid(id)) != NULL((void *)0)) { |
Although the value stored to 'cstr' is used in the enclosing expression, the value is never actually read from 'cstr' | |
| 241 | log_warnx("IMSG_CONSTRAINT_QUERY repeated for id %d", id); |
| 242 | return; |
| 243 | } |
| 244 | |
| 245 | if (len < sizeof(am)) { |
| 246 | log_warnx("invalid IMSG_CONSTRAINT_QUERY received"); |
| 247 | return; |
| 248 | } |
| 249 | memcpy(&am, data, sizeof(am)); |
| 250 | if (len != (sizeof(am) + am.namelen + am.pathlen)) { |
| 251 | log_warnx("invalid IMSG_CONSTRAINT_QUERY received"); |
| 252 | return; |
| 253 | } |
| 254 | /* Additional imsg data is obtained in the unpriv child */ |
| 255 | |
| 256 | if ((h = calloc(1, sizeof(*h))) == NULL((void *)0)) |
| 257 | fatal("calloc ntp_addr"); |
| 258 | memcpy(h, &am.a, sizeof(*h)); |
| 259 | h->next = NULL((void *)0); |
| 260 | |
| 261 | cstr = new_constraint(); |
| 262 | cstr->id = id; |
| 263 | cstr->addr = h; |
| 264 | cstr->addr_head.a = h; |
| 265 | constraint_add(cstr); |
| 266 | constraint_cnt++; |
| 267 | |
| 268 | if (socketpair(AF_UNIX1, SOCK_DGRAM2 | SOCK_CLOEXEC0x8000, AF_UNSPEC0, |
| 269 | pipes) == -1) |
| 270 | fatal("%s pipes", __func__); |
| 271 | |
| 272 | /* Prepare and send constraint data to child. */ |
| 273 | cstr->fd = pipes[0]; |
| 274 | imsg_init(&cstr->ibuf, cstr->fd); |
| 275 | if (imsg_compose(&cstr->ibuf, IMSG_CONSTRAINT_QUERY, id, 0, -1, |
| 276 | data, len) == -1) |
| 277 | fatal("%s: imsg_compose", __func__); |
| 278 | do { |
| 279 | rv = imsg_flush(&cstr->ibuf); |
| 280 | } while (rv == -1 && errno(*__errno()) == EAGAIN35); |
| 281 | if (rv == -1) |
| 282 | fatal("imsg_flush"); |
| 283 | |
| 284 | /* |
| 285 | * Fork child handlers and make sure to do any sensitive work in the |
| 286 | * the (unprivileged) child. The parent should not do any parsing, |
| 287 | * certificate loading etc. |
| 288 | */ |
| 289 | cstr->pid = start_child(CONSTRAINT_PROC_NAME"constraint", pipes[1], argc, argv); |
| 290 | } |
| 291 | |
| 292 | void |
| 293 | priv_constraint_readquery(struct constraint *cstr, struct ntp_addr_msg *am, |
| 294 | uint8_t **data) |
| 295 | { |
| 296 | struct ntp_addr *h; |
| 297 | uint8_t *dptr; |
| 298 | int n; |
| 299 | struct imsg imsg; |
| 300 | size_t mlen; |
| 301 | |
| 302 | /* Read the message our parent left us. */ |
| 303 | if (((n = imsg_read(&cstr->ibuf)) == -1 && errno(*__errno()) != EAGAIN35) || n == 0) |
| 304 | fatal("%s: imsg_read", __func__); |
| 305 | if (((n = imsg_get(&cstr->ibuf, &imsg)) == -1) || n == 0) |
| 306 | fatal("%s: imsg_get", __func__); |
| 307 | if (imsg.hdr.type != IMSG_CONSTRAINT_QUERY) |
| 308 | fatalx("%s: invalid message type", __func__); |
| 309 | |
| 310 | /* |
| 311 | * Copy the message contents just like our father: |
| 312 | * priv_constraint_msg(). |
| 313 | */ |
| 314 | mlen = imsg.hdr.len - IMSG_HEADER_SIZEsizeof(struct imsg_hdr); |
| 315 | if (mlen < sizeof(*am)) |
| 316 | fatalx("%s: mlen < sizeof(*am)", __func__); |
| 317 | |
| 318 | memcpy(am, imsg.data, sizeof(*am)); |
| 319 | if (mlen != (sizeof(*am) + am->namelen + am->pathlen)) |
| 320 | fatalx("%s: mlen < sizeof(*am) + am->namelen + am->pathlen", |
| 321 | __func__); |
| 322 | |
| 323 | if ((h = calloc(1, sizeof(*h))) == NULL((void *)0) || |
| 324 | (*data = calloc(1, mlen)) == NULL((void *)0)) |
| 325 | fatal("%s: calloc", __func__); |
| 326 | |
| 327 | memcpy(h, &am->a, sizeof(*h)); |
| 328 | h->next = NULL((void *)0); |
| 329 | |
| 330 | cstr->id = imsg.hdr.peerid; |
| 331 | cstr->addr = h; |
| 332 | cstr->addr_head.a = h; |
| 333 | |
| 334 | dptr = imsg.data; |
| 335 | memcpy(*data, dptr + sizeof(*am), mlen - sizeof(*am)); |
| 336 | imsg_free(&imsg); |
| 337 | } |
| 338 | |
| 339 | void |
| 340 | priv_constraint_child(const char *pw_dir, uid_t pw_uid, gid_t pw_gid) |
| 341 | { |
| 342 | struct constraint cstr; |
| 343 | struct ntp_addr_msg am; |
| 344 | uint8_t *data; |
| 345 | static char addr[NI_MAXHOST256]; |
| 346 | struct timeval rectv, xmttv; |
| 347 | struct sigaction sa; |
| 348 | void *ctx; |
| 349 | struct iovec iov[2]; |
| 350 | int i, rv; |
| 351 | |
| 352 | log_procinit("constraint"); |
| 353 | |
| 354 | if (setpriority(PRIO_PROCESS0, 0, 0) == -1) |
| 355 | log_warn("could not set priority"); |
| 356 | |
| 357 | /* load CA certs before chroot() */ |
| 358 | if ((conf->ca = tls_load_file(tls_default_ca_cert_file(), |
| 359 | &conf->ca_len, NULL((void *)0))) == NULL((void *)0)) |
| 360 | fatalx("failed to load constraint ca"); |
| 361 | |
| 362 | if (chroot(pw_dir) == -1) |
| 363 | fatal("chroot"); |
| 364 | if (chdir("/") == -1) |
| 365 | fatal("chdir(\"/\")"); |
| 366 | |
| 367 | if (setgroups(1, &pw_gid) || |
| 368 | setresgid(pw_gid, pw_gid, pw_gid) || |
| 369 | setresuid(pw_uid, pw_uid, pw_uid)) |
| 370 | fatal("can't drop privileges"); |
| 371 | |
| 372 | /* Reset all signal handlers */ |
| 373 | memset(&sa, 0, sizeof(sa)); |
| 374 | sigemptyset(&sa.sa_mask); |
| 375 | sa.sa_flags = SA_RESTART0x0002; |
| 376 | sa.sa_handler__sigaction_u.__sa_handler = SIG_DFL(void (*)(int))0; |
| 377 | for (i = 1; i < _NSIG33; i++) |
| 378 | sigaction(i, &sa, NULL((void *)0)); |
| 379 | |
| 380 | if (pledge("stdio inet", NULL((void *)0)) == -1) |
| 381 | fatal("pledge"); |
| 382 | |
| 383 | cstr.fd = CONSTRAINT_PASSFD(2 + 1); |
| 384 | imsg_init(&cstr.ibuf, cstr.fd); |
| 385 | priv_constraint_readquery(&cstr, &am, &data); |
| 386 | |
| 387 | /* |
| 388 | * Get the IP address as name and set the process title accordingly. |
| 389 | * This only converts an address into a string and does not trigger |
| 390 | * any DNS operation, so it is safe to be called without the dns |
| 391 | * pledge. |
| 392 | */ |
| 393 | if (getnameinfo((struct sockaddr *)&cstr.addr->ss, |
| 394 | SA_LEN((struct sockaddr *)&cstr.addr->ss)(((struct sockaddr *)&cstr.addr->ss)->sa_len), |
| 395 | addr, sizeof(addr), NULL((void *)0), 0, |
| 396 | NI_NUMERICHOST1) != 0) |
| 397 | fatalx("%s getnameinfo", __func__); |
| 398 | |
| 399 | log_debug("constraint request to %s", addr); |
| 400 | setproctitle("constraint from %s", addr); |
| 401 | (void)closefrom(CONSTRAINT_PASSFD(2 + 1) + 1); |
| 402 | |
| 403 | /* |
| 404 | * Set the close-on-exec flag to prevent leaking the communication |
| 405 | * channel to any exec'ed child. In theory this could never happen, |
| 406 | * constraints don't exec children and pledge() prevents it, |
| 407 | * but we keep it as a safety belt; especially for portability. |
| 408 | */ |
| 409 | if (fcntl(CONSTRAINT_PASSFD(2 + 1), F_SETFD2, FD_CLOEXEC1) == -1) |
| 410 | fatal("%s fcntl F_SETFD", __func__); |
| 411 | |
| 412 | /* Get remaining data from imsg in the unpriv child */ |
| 413 | if (am.namelen) { |
| 414 | if ((cstr.addr_head.name = |
| 415 | get_string(data, am.namelen)) == NULL((void *)0)) |
| 416 | fatalx("invalid IMSG_CONSTRAINT_QUERY name"); |
| 417 | data += am.namelen; |
| 418 | } |
| 419 | if (am.pathlen) { |
| 420 | if ((cstr.addr_head.path = |
| 421 | get_string(data, am.pathlen)) == NULL((void *)0)) |
| 422 | fatalx("invalid IMSG_CONSTRAINT_QUERY path"); |
| 423 | } |
| 424 | |
| 425 | /* Run! */ |
| 426 | if ((ctx = httpsdate_query(addr, |
| 427 | CONSTRAINT_PORT"443", cstr.addr_head.name, cstr.addr_head.path, |
| 428 | conf->ca, conf->ca_len, &rectv, &xmttv, am.synced)) == NULL((void *)0)) { |
| 429 | /* Abort with failure but without warning */ |
| 430 | exit(1); |
| 431 | } |
| 432 | |
| 433 | iov[0].iov_base = &rectv; |
| 434 | iov[0].iov_len = sizeof(rectv); |
| 435 | iov[1].iov_base = &xmttv; |
| 436 | iov[1].iov_len = sizeof(xmttv); |
| 437 | imsg_composev(&cstr.ibuf, |
| 438 | IMSG_CONSTRAINT_RESULT, 0, 0, -1, iov, 2); |
| 439 | do { |
| 440 | rv = imsg_flush(&cstr.ibuf); |
| 441 | } while (rv == -1 && errno(*__errno()) == EAGAIN35); |
| 442 | |
| 443 | /* Tear down the TLS connection after sending the result */ |
| 444 | httpsdate_free(ctx); |
| 445 | |
| 446 | exit(0); |
| 447 | } |
| 448 | |
| 449 | void |
| 450 | priv_constraint_check_child(pid_t pid, int status) |
| 451 | { |
| 452 | struct constraint *cstr; |
| 453 | int fail, sig; |
| 454 | char *signame; |
| 455 | |
| 456 | fail = sig = 0; |
| 457 | if (WIFSIGNALED(status)(((status) & 0177) != 0177 && ((status) & 0177 ) != 0)) { |
| 458 | sig = WTERMSIG(status)(((status) & 0177)); |
| 459 | } else if (WIFEXITED(status)(((status) & 0177) == 0)) { |
| 460 | if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) |
| 461 | fail = 1; |
| 462 | } else |
| 463 | fatalx("unexpected cause of SIGCHLD"); |
| 464 | |
| 465 | if ((cstr = constraint_bypid(pid)) != NULL((void *)0)) { |
| 466 | if (sig) { |
| 467 | if (sig != SIGTERM15) { |
| 468 | signame = strsignal(sig) ? |
| 469 | strsignal(sig) : "unknown"; |
| 470 | log_warnx("constraint %s; " |
| 471 | "terminated with signal %d (%s)", |
| 472 | log_ntp_addr(cstr->addr), sig, signame); |
| 473 | } |
| 474 | fail = 1; |
| 475 | } |
| 476 | |
| 477 | priv_constraint_close(cstr->fd, fail); |
| 478 | } |
| 479 | } |
| 480 | |
| 481 | void |
| 482 | priv_constraint_kill(u_int32_t id) |
| 483 | { |
| 484 | struct constraint *cstr; |
| 485 | |
| 486 | if ((cstr = constraint_byid(id)) == NULL((void *)0)) { |
| 487 | log_warnx("IMSG_CONSTRAINT_KILL for invalid id %d", id); |
| 488 | return; |
| 489 | } |
| 490 | |
| 491 | kill(cstr->pid, SIGTERM15); |
| 492 | } |
| 493 | |
| 494 | struct constraint * |
| 495 | constraint_byid(u_int32_t id) |
| 496 | { |
| 497 | struct constraint *cstr; |
| 498 | |
| 499 | TAILQ_FOREACH(cstr, &conf->constraints, entry)for((cstr) = ((&conf->constraints)->tqh_first); (cstr ) != ((void *)0); (cstr) = ((cstr)->entry.tqe_next)) { |
| 500 | if (cstr->id == id) |
| 501 | return (cstr); |
| 502 | } |
| 503 | |
| 504 | return (NULL((void *)0)); |
| 505 | } |
| 506 | |
| 507 | struct constraint * |
| 508 | constraint_byfd(int fd) |
| 509 | { |
| 510 | struct constraint *cstr; |
| 511 | |
| 512 | TAILQ_FOREACH(cstr, &conf->constraints, entry)for((cstr) = ((&conf->constraints)->tqh_first); (cstr ) != ((void *)0); (cstr) = ((cstr)->entry.tqe_next)) { |
| 513 | if (cstr->fd == fd) |
| 514 | return (cstr); |
| 515 | } |
| 516 | |
| 517 | return (NULL((void *)0)); |
| 518 | } |
| 519 | |
| 520 | struct constraint * |
| 521 | constraint_bypid(pid_t pid) |
| 522 | { |
| 523 | struct constraint *cstr; |
| 524 | |
| 525 | TAILQ_FOREACH(cstr, &conf->constraints, entry)for((cstr) = ((&conf->constraints)->tqh_first); (cstr ) != ((void *)0); (cstr) = ((cstr)->entry.tqe_next)) { |
| 526 | if (cstr->pid == pid) |
| 527 | return (cstr); |
| 528 | } |
| 529 | |
| 530 | return (NULL((void *)0)); |
| 531 | } |
| 532 | |
| 533 | int |
| 534 | constraint_close(u_int32_t id) |
| 535 | { |
| 536 | struct constraint *cstr; |
| 537 | |
| 538 | if ((cstr = constraint_byid(id)) == NULL((void *)0)) { |
| 539 | log_warn("%s: id %d: not found", __func__, id); |
| 540 | return (0); |
| 541 | } |
| 542 | |
| 543 | cstr->last = getmonotime(); |
| 544 | |
| 545 | if (cstr->addr == NULL((void *)0) || (cstr->addr = cstr->addr->next) == NULL((void *)0)) { |
| 546 | /* Either a pool or all addresses have been tried */ |
| 547 | cstr->addr = cstr->addr_head.a; |
| 548 | if (cstr->senderrors) |
| 549 | cstr->state = STATE_INVALID; |
| 550 | else if (cstr->state >= STATE_QUERY_SENT) |
| 551 | cstr->state = STATE_DNS_DONE; |
| 552 | |
| 553 | return (1); |
| 554 | } |
| 555 | |
| 556 | return (constraint_init(cstr)); |
| 557 | } |
| 558 | |
| 559 | void |
| 560 | priv_constraint_close(int fd, int fail) |
| 561 | { |
| 562 | struct constraint *cstr; |
| 563 | u_int32_t id; |
| 564 | |
| 565 | if ((cstr = constraint_byfd(fd)) == NULL((void *)0)) { |
| 566 | log_warn("%s: fd %d: not found", __func__, fd); |
| 567 | return; |
| 568 | } |
| 569 | |
| 570 | id = cstr->id; |
| 571 | constraint_remove(cstr); |
| 572 | constraint_cnt--; |
| 573 | |
| 574 | imsg_compose(ibuf, IMSG_CONSTRAINT_CLOSE, id, 0, -1, |
| 575 | &fail, sizeof(fail)); |
| 576 | } |
| 577 | |
| 578 | void |
| 579 | constraint_add(struct constraint *cstr) |
| 580 | { |
| 581 | TAILQ_INSERT_TAIL(&conf->constraints, cstr, entry)do { (cstr)->entry.tqe_next = ((void *)0); (cstr)->entry .tqe_prev = (&conf->constraints)->tqh_last; *(& conf->constraints)->tqh_last = (cstr); (&conf->constraints )->tqh_last = &(cstr)->entry.tqe_next; } while (0); |
| 582 | } |
| 583 | |
| 584 | void |
| 585 | constraint_remove(struct constraint *cstr) |
| 586 | { |
| 587 | TAILQ_REMOVE(&conf->constraints, cstr, entry)do { if (((cstr)->entry.tqe_next) != ((void *)0)) (cstr)-> entry.tqe_next->entry.tqe_prev = (cstr)->entry.tqe_prev ; else (&conf->constraints)->tqh_last = (cstr)-> entry.tqe_prev; *(cstr)->entry.tqe_prev = (cstr)->entry .tqe_next; ; ; } while (0); |
| 588 | |
| 589 | msgbuf_clear(&cstr->ibuf.w); |
| 590 | if (cstr->fd != -1) |
| 591 | close(cstr->fd); |
| 592 | free(cstr->addr_head.name); |
| 593 | free(cstr->addr_head.path); |
| 594 | free(cstr->addr); |
| 595 | free(cstr); |
| 596 | } |
| 597 | |
| 598 | void |
| 599 | constraint_purge(void) |
| 600 | { |
| 601 | struct constraint *cstr, *ncstr; |
| 602 | |
| 603 | TAILQ_FOREACH_SAFE(cstr, &conf->constraints, entry, ncstr)for ((cstr) = ((&conf->constraints)->tqh_first); (cstr ) != ((void *)0) && ((ncstr) = ((cstr)->entry.tqe_next ), 1); (cstr) = (ncstr)) |
| 604 | constraint_remove(cstr); |
| 605 | } |
| 606 | |
| 607 | int |
| 608 | priv_constraint_dispatch(struct pollfd *pfd) |
| 609 | { |
| 610 | struct imsg imsg; |
| 611 | struct constraint *cstr; |
| 612 | ssize_t n; |
| 613 | struct timeval tv[2]; |
| 614 | |
| 615 | if ((cstr = constraint_byfd(pfd->fd)) == NULL((void *)0)) |
| 616 | return (0); |
| 617 | |
| 618 | if (!(pfd->revents & POLLIN0x0001)) |
| 619 | return (0); |
| 620 | |
| 621 | if (((n = imsg_read(&cstr->ibuf)) == -1 && errno(*__errno()) != EAGAIN35) || n == 0) { |
| 622 | /* there's a race between SIGCHLD delivery and reading imsg |
| 623 | but if we've seen the reply, we're good */ |
| 624 | priv_constraint_close(pfd->fd, cstr->state != |
| 625 | STATE_REPLY_RECEIVED); |
| 626 | return (1); |
| 627 | } |
| 628 | |
| 629 | for (;;) { |
| 630 | if ((n = imsg_get(&cstr->ibuf, &imsg)) == -1) { |
| 631 | priv_constraint_close(pfd->fd, 1); |
| 632 | return (1); |
| 633 | } |
| 634 | if (n == 0) |
| 635 | break; |
| 636 | |
| 637 | switch (imsg.hdr.type) { |
| 638 | case IMSG_CONSTRAINT_RESULT: |
| 639 | if (imsg.hdr.len != IMSG_HEADER_SIZEsizeof(struct imsg_hdr) + sizeof(tv)) |
| 640 | fatalx("invalid IMSG_CONSTRAINT received"); |
| 641 | |
| 642 | /* state is maintained by child, but we want to |
| 643 | remember we've seen the result */ |
| 644 | cstr->state = STATE_REPLY_RECEIVED; |
| 645 | /* forward imsg to ntp child, don't parse it here */ |
| 646 | imsg_compose(ibuf, imsg.hdr.type, |
| 647 | cstr->id, 0, -1, imsg.data, sizeof(tv)); |
| 648 | break; |
| 649 | default: |
| 650 | break; |
| 651 | } |
| 652 | imsg_free(&imsg); |
| 653 | } |
| 654 | |
| 655 | return (0); |
| 656 | } |
| 657 | |
| 658 | void |
| 659 | constraint_msg_result(u_int32_t id, u_int8_t *data, size_t len) |
| 660 | { |
| 661 | struct constraint *cstr; |
| 662 | struct timeval tv[2]; |
| 663 | double offset; |
| 664 | |
| 665 | if ((cstr = constraint_byid(id)) == NULL((void *)0)) { |
| 666 | log_warnx("IMSG_CONSTRAINT_CLOSE with invalid constraint id"); |
| 667 | return; |
| 668 | } |
| 669 | |
| 670 | if (len != sizeof(tv)) { |
| 671 | log_warnx("invalid IMSG_CONSTRAINT received"); |
| 672 | return; |
| 673 | } |
| 674 | |
| 675 | memcpy(tv, data, len); |
| 676 | |
| 677 | offset = gettime_from_timeval(&tv[0]) - |
| 678 | gettime_from_timeval(&tv[1]); |
| 679 | |
| 680 | log_info("constraint reply from %s: offset %f", |
| 681 | log_ntp_addr(cstr->addr), |
| 682 | offset); |
| 683 | |
| 684 | cstr->state = STATE_REPLY_RECEIVED; |
| 685 | cstr->last = getmonotime(); |
| 686 | cstr->constraint = tv[0].tv_sec; |
| 687 | |
| 688 | constraint_update(); |
| 689 | } |
| 690 | |
| 691 | void |
| 692 | constraint_msg_close(u_int32_t id, u_int8_t *data, size_t len) |
| 693 | { |
| 694 | struct constraint *cstr, *tmp; |
| 695 | int fail, cnt; |
| 696 | static int total_fails; |
| 697 | |
| 698 | if ((cstr = constraint_byid(id)) == NULL((void *)0)) { |
| 699 | log_warnx("IMSG_CONSTRAINT_CLOSE with invalid constraint id"); |
| 700 | return; |
| 701 | } |
| 702 | |
| 703 | if (len != sizeof(int)) { |
| 704 | log_warnx("invalid IMSG_CONSTRAINT_CLOSE received"); |
| 705 | return; |
| 706 | } |
| 707 | |
| 708 | memcpy(&fail, data, len); |
| 709 | |
| 710 | if (fail) { |
| 711 | log_debug("no constraint reply from %s" |
| 712 | " received in time, next query %ds", |
| 713 | log_ntp_addr(cstr->addr), |
| 714 | CONSTRAINT_SCAN_INTERVAL(15*60)); |
| 715 | |
| 716 | cnt = 0; |
| 717 | TAILQ_FOREACH(tmp, &conf->constraints, entry)for((tmp) = ((&conf->constraints)->tqh_first); (tmp ) != ((void *)0); (tmp) = ((tmp)->entry.tqe_next)) |
| 718 | cnt++; |
| 719 | if (cnt > 0 && ++total_fails >= cnt && |
| 720 | conf->constraint_median == 0) { |
| 721 | log_warnx("constraints configured but none available"); |
| 722 | total_fails = 0; |
| 723 | } |
| 724 | } |
| 725 | |
| 726 | if (fail || cstr->state < STATE_QUERY_SENT) { |
| 727 | cstr->senderrors++; |
| 728 | constraint_close(cstr->id); |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | void |
| 733 | constraint_msg_dns(u_int32_t id, u_int8_t *data, size_t len) |
| 734 | { |
| 735 | struct constraint *cstr, *ncstr = NULL((void *)0); |
| 736 | u_int8_t *p; |
| 737 | struct ntp_addr *h; |
| 738 | |
| 739 | if ((cstr = constraint_byid(id)) == NULL((void *)0)) { |
| 740 | log_debug("IMSG_CONSTRAINT_DNS with invalid constraint id"); |
| 741 | return; |
| 742 | } |
| 743 | if (cstr->addr != NULL((void *)0)) { |
| 744 | log_warnx("IMSG_CONSTRAINT_DNS but addr != NULL!"); |
| 745 | return; |
| 746 | } |
| 747 | if (len == 0) { |
| 748 | log_debug("%s FAILED", __func__); |
| 749 | cstr->state = STATE_DNS_TEMPFAIL; |
| 750 | return; |
| 751 | } |
| 752 | |
| 753 | if (len % (sizeof(struct sockaddr_storage) + sizeof(int)) != 0) |
| 754 | fatalx("IMSG_CONSTRAINT_DNS len"); |
| 755 | |
| 756 | if (cstr->addr_head.pool) { |
| 757 | struct constraint *n, *tmp; |
| 758 | TAILQ_FOREACH_SAFE(n, &conf->constraints, entry, tmp)for ((n) = ((&conf->constraints)->tqh_first); (n) != ((void *)0) && ((tmp) = ((n)->entry.tqe_next), 1) ; (n) = (tmp)) { |
| 759 | if (cstr->id == n->id) |
| 760 | continue; |
| 761 | if (cstr->addr_head.pool == n->addr_head.pool) |
| 762 | constraint_remove(n); |
| 763 | } |
| 764 | } |
| 765 | |
| 766 | p = data; |
| 767 | do { |
| 768 | if ((h = calloc(1, sizeof(*h))) == NULL((void *)0)) |
| 769 | fatal("calloc ntp_addr"); |
| 770 | memcpy(&h->ss, p, sizeof(h->ss)); |
| 771 | p += sizeof(h->ss); |
| 772 | len -= sizeof(h->ss); |
| 773 | memcpy(&h->notauth, p, sizeof(int)); |
| 774 | p += sizeof(int); |
| 775 | len -= sizeof(int); |
| 776 | |
| 777 | if (ncstr == NULL((void *)0) || cstr->addr_head.pool) { |
| 778 | ncstr = new_constraint(); |
| 779 | ncstr->addr = h; |
| 780 | ncstr->addr_head.a = h; |
| 781 | ncstr->addr_head.name = strdup(cstr->addr_head.name); |
| 782 | ncstr->addr_head.path = strdup(cstr->addr_head.path); |
| 783 | if (ncstr->addr_head.name == NULL((void *)0) || |
| 784 | ncstr->addr_head.path == NULL((void *)0)) |
| 785 | fatal("calloc name"); |
| 786 | ncstr->addr_head.pool = cstr->addr_head.pool; |
| 787 | ncstr->state = STATE_DNS_DONE; |
| 788 | constraint_add(ncstr); |
| 789 | constraint_cnt += constraint_init(ncstr); |
| 790 | } else { |
| 791 | h->next = ncstr->addr; |
| 792 | ncstr->addr = h; |
| 793 | ncstr->addr_head.a = h; |
| 794 | } |
| 795 | } while (len); |
| 796 | |
| 797 | constraint_remove(cstr); |
| 798 | } |
| 799 | |
| 800 | int |
| 801 | constraint_cmp(const void *a, const void *b) |
| 802 | { |
| 803 | time_t at = *(const time_t *)a; |
| 804 | time_t bt = *(const time_t *)b; |
| 805 | return at < bt ? -1 : (at > bt ? 1 : 0); |
| 806 | } |
| 807 | |
| 808 | void |
| 809 | constraint_update(void) |
| 810 | { |
| 811 | struct constraint *cstr; |
| 812 | int cnt, i; |
| 813 | time_t *values; |
| 814 | time_t now; |
| 815 | |
| 816 | now = getmonotime(); |
| 817 | |
| 818 | cnt = 0; |
| 819 | TAILQ_FOREACH(cstr, &conf->constraints, entry)for((cstr) = ((&conf->constraints)->tqh_first); (cstr ) != ((void *)0); (cstr) = ((cstr)->entry.tqe_next)) { |
| 820 | if (cstr->state != STATE_REPLY_RECEIVED) |
| 821 | continue; |
| 822 | cnt++; |
| 823 | } |
| 824 | if (cnt == 0) |
| 825 | return; |
| 826 | |
| 827 | if ((values = calloc(cnt, sizeof(time_t))) == NULL((void *)0)) |
| 828 | fatal("calloc"); |
| 829 | |
| 830 | i = 0; |
| 831 | TAILQ_FOREACH(cstr, &conf->constraints, entry)for((cstr) = ((&conf->constraints)->tqh_first); (cstr ) != ((void *)0); (cstr) = ((cstr)->entry.tqe_next)) { |
| 832 | if (cstr->state != STATE_REPLY_RECEIVED) |
| 833 | continue; |
| 834 | values[i++] = cstr->constraint + (now - cstr->last); |
| 835 | } |
| 836 | |
| 837 | qsort(values, cnt, sizeof(time_t), constraint_cmp); |
| 838 | |
| 839 | /* calculate median */ |
| 840 | i = cnt / 2; |
| 841 | if (cnt % 2 == 0) |
| 842 | conf->constraint_median = (values[i - 1] + values[i]) / 2; |
| 843 | else |
| 844 | conf->constraint_median = values[i]; |
| 845 | |
| 846 | conf->constraint_last = now; |
| 847 | |
| 848 | free(values); |
| 849 | } |
| 850 | |
| 851 | void |
| 852 | constraint_reset(void) |
| 853 | { |
| 854 | struct constraint *cstr; |
| 855 | |
| 856 | TAILQ_FOREACH(cstr, &conf->constraints, entry)for((cstr) = ((&conf->constraints)->tqh_first); (cstr ) != ((void *)0); (cstr) = ((cstr)->entry.tqe_next)) { |
| 857 | if (cstr->state == STATE_QUERY_SENT) |
| 858 | continue; |
| 859 | constraint_close(cstr->id); |
| 860 | constraint_addr_head_clear(cstr); |
| 861 | constraint_init(cstr); |
| 862 | } |
| 863 | conf->constraint_errors = 0; |
| 864 | } |
| 865 | |
| 866 | int |
| 867 | constraint_check(double val) |
| 868 | { |
| 869 | struct timeval tv; |
| 870 | double diff; |
| 871 | time_t now; |
| 872 | |
| 873 | if (conf->constraint_median == 0) |
| 874 | return (0); |
| 875 | |
| 876 | /* Calculate the constraint with the current offset */ |
| 877 | now = getmonotime(); |
| 878 | tv.tv_sec = conf->constraint_median + (now - conf->constraint_last); |
| 879 | tv.tv_usec = 0; |
| 880 | diff = fabs(val - gettime_from_timeval(&tv)); |
| 881 | |
| 882 | if (diff > CONSTRAINT_MARGIN(2.0*60)) { |
| 883 | if (conf->constraint_errors++ > |
| 884 | (CONSTRAINT_ERROR_MARGIN(4) * peer_cnt)) { |
| 885 | constraint_reset(); |
| 886 | } |
| 887 | |
| 888 | return (-1); |
| 889 | } |
| 890 | |
| 891 | return (0); |
| 892 | } |
| 893 | |
| 894 | struct httpsdate * |
| 895 | httpsdate_init(const char *addr, const char *port, const char *hostname, |
| 896 | const char *path, const u_int8_t *ca, size_t ca_len, int synced) |
| 897 | { |
| 898 | struct httpsdate *httpsdate = NULL((void *)0); |
| 899 | |
| 900 | if ((httpsdate = calloc(1, sizeof(*httpsdate))) == NULL((void *)0)) |
| 901 | goto fail; |
| 902 | |
| 903 | if (hostname == NULL((void *)0)) |
| 904 | hostname = addr; |
| 905 | |
| 906 | if ((httpsdate->tls_addr = strdup(addr)) == NULL((void *)0) || |
| 907 | (httpsdate->tls_port = strdup(port)) == NULL((void *)0) || |
| 908 | (httpsdate->tls_hostname = strdup(hostname)) == NULL((void *)0) || |
| 909 | (httpsdate->tls_path = strdup(path)) == NULL((void *)0)) |
| 910 | goto fail; |
| 911 | |
| 912 | if (asprintf(&httpsdate->tls_request, |
| 913 | "HEAD %s HTTP/1.1\r\nHost: %s\r\nConnection: close\r\n\r\n", |
| 914 | httpsdate->tls_path, httpsdate->tls_hostname) == -1) |
| 915 | goto fail; |
| 916 | |
| 917 | if ((httpsdate->tls_config = tls_config_new()) == NULL((void *)0)) |
| 918 | goto fail; |
| 919 | if (tls_config_set_ca_mem(httpsdate->tls_config, ca, ca_len) == -1) |
| 920 | goto fail; |
| 921 | |
| 922 | /* |
| 923 | * Due to the fact that we're trying to determine a constraint for time |
| 924 | * we do our own certificate validity checking, since the automatic |
| 925 | * version is based on our wallclock, which may well be inaccurate... |
| 926 | */ |
| 927 | if (!synced) { |
| 928 | log_debug("constraints: using received time in certificate validation"); |
| 929 | tls_config_insecure_noverifytime(httpsdate->tls_config); |
| 930 | } |
| 931 | |
| 932 | return (httpsdate); |
| 933 | |
| 934 | fail: |
| 935 | httpsdate_free(httpsdate); |
| 936 | return (NULL((void *)0)); |
| 937 | } |
| 938 | |
| 939 | void |
| 940 | httpsdate_free(void *arg) |
| 941 | { |
| 942 | struct httpsdate *httpsdate = arg; |
| 943 | if (httpsdate == NULL((void *)0)) |
| 944 | return; |
| 945 | if (httpsdate->tls_ctx) |
| 946 | tls_close(httpsdate->tls_ctx); |
| 947 | tls_free(httpsdate->tls_ctx); |
| 948 | tls_config_free(httpsdate->tls_config); |
| 949 | free(httpsdate->tls_addr); |
| 950 | free(httpsdate->tls_port); |
| 951 | free(httpsdate->tls_hostname); |
| 952 | free(httpsdate->tls_path); |
| 953 | free(httpsdate->tls_request); |
| 954 | free(httpsdate); |
| 955 | } |
| 956 | |
| 957 | int |
| 958 | httpsdate_request(struct httpsdate *httpsdate, struct timeval *when, int synced) |
| 959 | { |
| 960 | char timebuf1[32], timebuf2[32]; |
| 961 | size_t outlen = 0, maxlength = CONSTRAINT_MAXHEADERLENGTH8192, len; |
| 962 | char *line, *p, *buf; |
| 963 | time_t httptime, notbefore, notafter; |
| 964 | struct tm *tm; |
| 965 | ssize_t ret; |
| 966 | |
| 967 | if ((httpsdate->tls_ctx = tls_client()) == NULL((void *)0)) |
| 968 | goto fail; |
| 969 | |
| 970 | if (tls_configure(httpsdate->tls_ctx, httpsdate->tls_config) == -1) |
| 971 | goto fail; |
| 972 | |
| 973 | /* |
| 974 | * libtls expects an address string, which can also be a DNS name, |
| 975 | * but we pass a pre-resolved IP address string in tls_addr so it |
| 976 | * does not trigger any DNS operation and is safe to be called |
| 977 | * without the dns pledge. |
| 978 | */ |
| 979 | if (tls_connect_servername(httpsdate->tls_ctx, httpsdate->tls_addr, |
| 980 | httpsdate->tls_port, httpsdate->tls_hostname) == -1) { |
| 981 | log_debug("tls connect failed: %s (%s): %s", |
| 982 | httpsdate->tls_addr, httpsdate->tls_hostname, |
| 983 | tls_error(httpsdate->tls_ctx)); |
| 984 | goto fail; |
| 985 | } |
| 986 | |
| 987 | buf = httpsdate->tls_request; |
| 988 | len = strlen(httpsdate->tls_request); |
| 989 | while (len > 0) { |
| 990 | ret = tls_write(httpsdate->tls_ctx, buf, len); |
| 991 | if (ret == TLS_WANT_POLLIN-2 || ret == TLS_WANT_POLLOUT-3) |
| 992 | continue; |
| 993 | if (ret == -1) { |
| 994 | log_warnx("tls write failed: %s (%s): %s", |
| 995 | httpsdate->tls_addr, httpsdate->tls_hostname, |
| 996 | tls_error(httpsdate->tls_ctx)); |
| 997 | goto fail; |
| 998 | } |
| 999 | buf += ret; |
| 1000 | len -= ret; |
| 1001 | } |
| 1002 | |
| 1003 | while ((line = tls_readline(httpsdate->tls_ctx, &outlen, |
| 1004 | &maxlength, when)) != NULL((void *)0)) { |
| 1005 | line[strcspn(line, "\r\n")] = '\0'; |
| 1006 | |
| 1007 | if ((p = strchr(line, ' ')) == NULL((void *)0) || *p == '\0') |
| 1008 | goto next; |
| 1009 | *p++ = '\0'; |
| 1010 | if (strcasecmp("Date:", line) != 0) |
| 1011 | goto next; |
| 1012 | |
| 1013 | /* |
| 1014 | * Expect the date/time format as IMF-fixdate which is |
| 1015 | * mandated by HTTP/1.1 in the new RFC 7231 and was |
| 1016 | * preferred by RFC 2616. Other formats would be RFC 850 |
| 1017 | * or ANSI C's asctime() - the latter doesn't include |
| 1018 | * the timezone which is required here. |
| 1019 | */ |
| 1020 | if (strptime(p, IMF_FIXDATE"%a, %d %h %Y %T GMT", |
| 1021 | &httpsdate->tls_tm) == NULL((void *)0)) { |
| 1022 | log_warnx("unsupported date format"); |
| 1023 | free(line); |
| 1024 | goto fail; |
| 1025 | } |
| 1026 | |
| 1027 | free(line); |
| 1028 | break; |
| 1029 | next: |
| 1030 | free(line); |
| 1031 | } |
| 1032 | if (httpsdate->tls_tm.tm_year == 0) |
| 1033 | goto fail; |
| 1034 | |
| 1035 | /* If we are synced, we already checked the certificate validity */ |
| 1036 | if (synced) |
| 1037 | return 0; |
| 1038 | |
| 1039 | /* |
| 1040 | * Now manually check the validity of the certificate presented in the |
| 1041 | * TLS handshake, based on the time specified by the server's HTTP Date: |
| 1042 | * header. |
| 1043 | */ |
| 1044 | notbefore = tls_peer_cert_notbefore(httpsdate->tls_ctx); |
| 1045 | notafter = tls_peer_cert_notafter(httpsdate->tls_ctx); |
| 1046 | if ((httptime = timegm(&httpsdate->tls_tm)) == -1) |
| 1047 | goto fail; |
| 1048 | if (httptime <= notbefore) { |
| 1049 | if ((tm = gmtime(¬before)) == NULL((void *)0)) |
| 1050 | goto fail; |
| 1051 | if (strftime(timebuf1, sizeof(timebuf1), X509_DATE"%Y-%m-%d %T UTC", tm) == 0) |
| 1052 | goto fail; |
| 1053 | if (strftime(timebuf2, sizeof(timebuf2), X509_DATE"%Y-%m-%d %T UTC", |
| 1054 | &httpsdate->tls_tm) == 0) |
| 1055 | goto fail; |
| 1056 | log_warnx("tls certificate not yet valid: %s (%s): " |
| 1057 | "not before %s, now %s", httpsdate->tls_addr, |
| 1058 | httpsdate->tls_hostname, timebuf1, timebuf2); |
| 1059 | goto fail; |
| 1060 | } |
| 1061 | if (httptime >= notafter) { |
| 1062 | if ((tm = gmtime(¬after)) == NULL((void *)0)) |
| 1063 | goto fail; |
| 1064 | if (strftime(timebuf1, sizeof(timebuf1), X509_DATE"%Y-%m-%d %T UTC", tm) == 0) |
| 1065 | goto fail; |
| 1066 | if (strftime(timebuf2, sizeof(timebuf2), X509_DATE"%Y-%m-%d %T UTC", |
| 1067 | &httpsdate->tls_tm) == 0) |
| 1068 | goto fail; |
| 1069 | log_warnx("tls certificate expired: %s (%s): " |
| 1070 | "not after %s, now %s", httpsdate->tls_addr, |
| 1071 | httpsdate->tls_hostname, timebuf1, timebuf2); |
| 1072 | goto fail; |
| 1073 | } |
| 1074 | |
| 1075 | return (0); |
| 1076 | |
| 1077 | fail: |
| 1078 | httpsdate_free(httpsdate); |
| 1079 | return (-1); |
| 1080 | } |
| 1081 | |
| 1082 | void * |
| 1083 | httpsdate_query(const char *addr, const char *port, const char *hostname, |
| 1084 | const char *path, const u_int8_t *ca, size_t ca_len, |
| 1085 | struct timeval *rectv, struct timeval *xmttv, int synced) |
| 1086 | { |
| 1087 | struct httpsdate *httpsdate; |
| 1088 | struct timeval when; |
| 1089 | time_t t; |
| 1090 | |
| 1091 | if ((httpsdate = httpsdate_init(addr, port, hostname, path, |
| 1092 | ca, ca_len, synced)) == NULL((void *)0)) |
| 1093 | return (NULL((void *)0)); |
| 1094 | |
| 1095 | if (httpsdate_request(httpsdate, &when, synced) == -1) |
| 1096 | return (NULL((void *)0)); |
| 1097 | |
| 1098 | /* Return parsed date as local time */ |
| 1099 | t = timegm(&httpsdate->tls_tm); |
| 1100 | |
| 1101 | /* Report parsed Date: as "received time" */ |
| 1102 | rectv->tv_sec = t; |
| 1103 | rectv->tv_usec = 0; |
| 1104 | |
| 1105 | /* And add delay as "transmit time" */ |
| 1106 | xmttv->tv_sec = when.tv_sec; |
| 1107 | xmttv->tv_usec = when.tv_usec; |
| 1108 | |
| 1109 | return (httpsdate); |
| 1110 | } |
| 1111 | |
| 1112 | /* Based on SSL_readline in ftp/fetch.c */ |
| 1113 | char * |
| 1114 | tls_readline(struct tls *tls, size_t *lenp, size_t *maxlength, |
| 1115 | struct timeval *when) |
| 1116 | { |
| 1117 | size_t i, len; |
| 1118 | char *buf, *q, c; |
| 1119 | ssize_t ret; |
| 1120 | |
| 1121 | len = 128; |
| 1122 | if ((buf = malloc(len)) == NULL((void *)0)) |
| 1123 | fatal("Can't allocate memory for transfer buffer"); |
| 1124 | for (i = 0; ; i++) { |
| 1125 | if (i >= len - 1) { |
| 1126 | if ((q = reallocarray(buf, len, 2)) == NULL((void *)0)) |
| 1127 | fatal("Can't expand transfer buffer"); |
| 1128 | buf = q; |
| 1129 | len *= 2; |
| 1130 | } |
| 1131 | again: |
| 1132 | ret = tls_read(tls, &c, 1); |
| 1133 | if (ret == TLS_WANT_POLLIN-2 || ret == TLS_WANT_POLLOUT-3) |
| 1134 | goto again; |
| 1135 | if (ret == -1) { |
| 1136 | /* SSL read error, ignore */ |
| 1137 | free(buf); |
| 1138 | return (NULL((void *)0)); |
| 1139 | } |
| 1140 | |
| 1141 | if (maxlength != NULL((void *)0) && (*maxlength)-- == 0) { |
| 1142 | log_warnx("maximum length exceeded"); |
| 1143 | free(buf); |
| 1144 | return (NULL((void *)0)); |
| 1145 | } |
| 1146 | |
| 1147 | buf[i] = c; |
| 1148 | if (c == '\n') |
| 1149 | break; |
| 1150 | } |
| 1151 | *lenp = i; |
| 1152 | if (gettimeofday(when, NULL((void *)0)) == -1) |
| 1153 | fatal("gettimeofday"); |
| 1154 | return (buf); |
| 1155 | } |
| 1156 | |
| 1157 | char * |
| 1158 | get_string(u_int8_t *ptr, size_t len) |
| 1159 | { |
| 1160 | size_t i; |
| 1161 | |
| 1162 | for (i = 0; i < len; i++) |
| 1163 | if (!(isprint(ptr[i]) || isspace(ptr[i]))) |
| 1164 | break; |
| 1165 | |
| 1166 | return strndup(ptr, i); |
| 1167 | } |