1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
|
/*
* svr.c - dnssec-trigger server implementation
*
* Copyright (c) 2011, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains the server implementation.
*/
#include "config.h"
#include "svr.h"
#include "cfg.h"
#include "log.h"
#include "http.h"
#include "probe.h"
#include "netevent.h"
#include "net_help.h"
#include "reshook.h"
#include "update.h"
#ifdef USE_WINSOCK
#include "winsock_event.h"
#endif
struct svr* global_svr = NULL;
static int setup_ssl_ctx(struct svr* svr);
static int setup_listen(struct svr* svr);
static void sslconn_delete(struct sslconn* sc);
static int sslconn_readline(struct sslconn* sc);
static int sslconn_write(struct sslconn* sc);
static int sslconn_checkclose(struct sslconn* sc);
static void sslconn_shutdown(struct sslconn* sc);
static void sslconn_command(struct sslconn* sc);
static void sslconn_persist_command(struct sslconn* sc);
static void send_results_to_con(struct svr* svr, struct sslconn* s);
struct svr* svr_create(struct cfg* cfg)
{
struct svr* svr = (struct svr*)calloc(1, sizeof(*svr));
if(!svr) return NULL;
global_svr = svr;
svr->max_active = 32;
svr->cfg = cfg;
svr->base = comm_base_create(0);
ldns_init_random(NULL, 0);
if(!svr->base) {
log_err("cannot create base");
svr_delete(svr);
return NULL;
}
svr->udp_buffer = ldns_buffer_new(65553);
if(!svr->udp_buffer) {
log_err("out of memory");
svr_delete(svr);
return NULL;
}
svr->retry_timer = comm_timer_create(svr->base, &svr_retry_callback,
svr);
svr->tcp_timer = comm_timer_create(svr->base, &svr_tcp_callback, svr);
if(!svr->retry_timer || !svr->tcp_timer) {
log_err("out of memory");
svr_delete(svr);
return NULL;
}
if(cfg->check_updates) {
svr->update = selfupdate_create(svr, cfg);
if(!svr->update) {
log_err("out of memory");
svr_delete(svr);
return NULL;
}
}
/* setup SSL_CTX */
if(!setup_ssl_ctx(svr)) {
log_err("cannot setup SSL context");
svr_delete(svr);
return NULL;
}
/* create listening */
if(!setup_listen(svr)) {
log_err("cannot setup listening socket");
svr_delete(svr);
return NULL;
}
return svr;
}
void svr_delete(struct svr* svr)
{
struct listen_list* ll, *nll;
if(!svr) return;
/* delete busy */
while(svr->busy_list) {
(void)SSL_shutdown(svr->busy_list->ssl);
sslconn_delete(svr->busy_list);
}
/* delete listening */
ll = svr->listen;
while(ll) {
nll = ll->next;
comm_point_delete(ll->c);
free(ll);
ll=nll;
}
/* delete probes */
probe_list_delete(svr->probes);
if(svr->ctx) {
SSL_CTX_free(svr->ctx);
}
selfupdate_delete(svr->update);
ldns_buffer_free(svr->udp_buffer);
comm_timer_delete(svr->retry_timer);
comm_timer_delete(svr->tcp_timer);
http_general_delete(svr->http);
comm_base_delete(svr->base);
free(svr);
}
static int setup_ssl_ctx(struct svr* s)
{
char* s_cert;
char* s_key;
s->ctx = SSL_CTX_new(SSLv23_server_method());
if(!s->ctx) {
log_crypto_err("could not SSL_CTX_new");
return 0;
}
/* no SSLv2 because has defects */
if(!(SSL_CTX_set_options(s->ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)){
log_crypto_err("could not set SSL_OP_NO_SSLv2");
return 0;
}
s_cert = s->cfg->server_cert_file;
s_key = s->cfg->server_key_file;
verbose(VERB_ALGO, "setup SSL certificates");
if(!SSL_CTX_use_certificate_file(s->ctx,s_cert,SSL_FILETYPE_PEM)) {
log_err("Error for server-cert-file: %s", s_cert);
log_crypto_err("Error in SSL_CTX use_certificate_file");
return 0;
}
if(!SSL_CTX_use_PrivateKey_file(s->ctx,s_key,SSL_FILETYPE_PEM)) {
log_err("Error for server-key-file: %s", s_key);
log_crypto_err("Error in SSL_CTX use_PrivateKey_file");
return 0;
}
if(!SSL_CTX_check_private_key(s->ctx)) {
log_err("Error for server-key-file: %s", s_key);
log_crypto_err("Error in SSL_CTX check_private_key");
return 0;
}
if(!SSL_CTX_load_verify_locations(s->ctx, s_cert, NULL)) {
log_crypto_err("Error setting up SSL_CTX verify locations");
return 0;
}
SSL_CTX_set_client_CA_list(s->ctx, SSL_load_client_CA_file(s_cert));
SSL_CTX_set_verify(s->ctx, SSL_VERIFY_PEER, NULL);
return 1;
}
static int setup_listen(struct svr* svr)
{
const char* str="127.0.0.1";
struct sockaddr_storage addr;
socklen_t len;
int s;
int fam;
struct listen_list* e;
#if defined(SO_REUSEADDR) || defined(IPV6_V6ONLY)
int on = 1;
#endif
if(!ipstrtoaddr(str, svr->cfg->control_port, &addr, &len)) {
log_err("cannot parse ifname %s", str);
return 0;
}
if(strchr(str, ':')) fam = AF_INET6;
else fam = AF_INET;
s = socket(fam, SOCK_STREAM, 0);
if(s == -1) {
log_err("socket %s: %s", str, strerror(errno));
return 0;
}
#ifdef SO_REUSEADDR
if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&on,
(socklen_t)sizeof(on)) < 0) {
log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
strerror(errno));
}
#endif
#if defined(IPV6_V6ONLY)
if(fam == AF_INET6) {
if(setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
(void*)&on, (socklen_t)sizeof(on)) < 0) {
log_err("setsockopt(..., IPV6_V6ONLY, ...) failed: %s",
strerror(errno));
}
}
#endif
if(bind(s, (struct sockaddr*)&addr, len) != 0) {
fatal_exit("can't bind tcp socket %s: %s", str, strerror(errno));
}
fd_set_nonblock(s);
if(listen(s, 15) == -1) {
log_err("can't listen: %s", strerror(errno));
}
/* add entry */
e = (struct listen_list*)calloc(1, sizeof(*e));
if(!e) {
fatal_exit("out of memory");
}
e->c = comm_point_create_raw(svr->base, s, 0, handle_ssl_accept, NULL);
e->c->do_not_close = 0;
e->next = svr->listen;
svr->listen = e;
return 1;
}
void svr_service(struct svr* svr)
{
comm_base_dispatch(svr->base);
}
static void sslconn_delete(struct sslconn* sc)
{
struct sslconn** pp;
if(!sc) return;
/* delete and remove from busylist */
for(pp = &global_svr->busy_list; *pp; pp = &((*pp)->next)) {
if((*pp) == sc) {
(*pp) = sc->next;
break;
}
}
global_svr->active--;
if(sc->buffer)
ldns_buffer_free(sc->buffer);
comm_point_delete(sc->c);
if(sc->ssl)
SSL_free(sc->ssl);
free(sc);
}
int handle_ssl_accept(struct comm_point* c, void* ATTR_UNUSED(arg), int err,
struct comm_reply* ATTR_UNUSED(reply_info))
{
struct sockaddr_storage addr;
socklen_t addrlen;
int s;
struct svr* svr = global_svr;
struct sslconn* sc;
if(err != NETEVENT_NOERROR) {
log_err("error %d on remote_accept_callback", err);
return 0;
}
/* perform the accept */
s = comm_point_perform_accept(c, &addr, &addrlen);
if(s == -1)
return 0;
/* create new commpoint unless we are servicing already */
if(svr->active >= svr->max_active) {
log_warn("drop incoming remote control: too many connections");
close_exit:
#ifndef USE_WINSOCK
close(s);
#else
closesocket(s);
#endif
return 0;
}
/* setup commpoint to service the remote control command */
sc = (struct sslconn*)calloc(1, sizeof(*sc));
if(!sc) {
log_err("out of memory");
goto close_exit;
}
/* start in reading state */
sc->c = comm_point_create_raw(svr->base, s, 0, &control_callback, sc);
if(!sc->c) {
log_err("out of memory");
free(sc);
goto close_exit;
}
log_addr(VERB_QUERY, "new control connection from", &addr, addrlen);
sc->c->do_not_close = 0;
/* no timeout on the connection: the panel stays connected for long */
memcpy(&sc->c->repinfo.addr, &addr, addrlen);
sc->c->repinfo.addrlen = addrlen;
sc->shake_state = rc_hs_read;
sc->ssl = SSL_new(svr->ctx);
if(!sc->ssl) {
log_crypto_err("could not SSL_new");
comm_point_delete(sc->c);
free(sc);
return 0;
}
SSL_set_accept_state(sc->ssl);
(void)SSL_set_mode(sc->ssl, SSL_MODE_AUTO_RETRY);
if(!SSL_set_fd(sc->ssl, s)) {
log_crypto_err("could not SSL_set_fd");
SSL_free(sc->ssl);
comm_point_delete(sc->c);
free(sc);
return 0;
}
#ifdef USE_WINSOCK
comm_point_tcp_win_bio_cb(sc->c, sc->ssl);
#endif
sc->buffer = ldns_buffer_new(65536);
if(!sc->buffer) {
log_err("out of memory");
SSL_free(sc->ssl);
comm_point_delete(sc->c);
free(sc);
return 0;
}
sc->next = svr->busy_list;
svr->busy_list = sc;
svr->active ++;
/* perform the first nonblocking read already, for windows,
* so it can return wouldblock. could be faster too. */
(void)control_callback(sc->c, sc, NETEVENT_NOERROR, NULL);
return 0;
}
int control_callback(struct comm_point* c, void* arg, int err,
struct comm_reply* ATTR_UNUSED(reply_info))
{
struct sslconn* s = (struct sslconn*)arg;
int r;
if(err != NETEVENT_NOERROR) {
if(err==NETEVENT_TIMEOUT)
log_err("remote control timed out");
sslconn_delete(s);
return 0;
}
/* (continue to) setup the SSL connection */
if(s->shake_state == rc_hs_read || s->shake_state == rc_hs_write) {
ERR_clear_error();
r = SSL_do_handshake(s->ssl);
if(r != 1) {
int r2 = SSL_get_error(s->ssl, r);
if(r2 == SSL_ERROR_WANT_READ) {
if(s->shake_state == rc_hs_read) {
/* try again later */
return 0;
}
s->shake_state = rc_hs_read;
comm_point_listen_for_rw(c, 1, 0);
return 0;
} else if(r2 == SSL_ERROR_WANT_WRITE) {
if(s->shake_state == rc_hs_write) {
/* try again later */
return 0;
}
s->shake_state = rc_hs_write;
comm_point_listen_for_rw(c, 0, 1);
return 0;
} else if(r2 == SSL_ERROR_SYSCALL) {
if(ERR_peek_error()) {
char errbuf[128];
ERR_error_string_n(ERR_get_error(),
errbuf, sizeof(errbuf));
log_err("ssl_handshake: %s", errbuf);
} else if(r == 0) {
log_err("ssl_handshake EOF violation");
} else if(r == -1) {
#ifdef USE_WINSOCK
log_err("ssl_handshake syscall: "
"%s, wsa: %s", strerror(errno),
wsa_strerror(WSAGetLastError()));
#else
log_err("ssl_handshake syscall: %s",
strerror(errno));
#endif
} else log_err("ssl_handshake syscall ret %d",
r);
sslconn_delete(s);
return 0;
} else {
if(r == 0)
log_err("remote control connection closed prematurely");
log_addr(1, "failed connection from",
&s->c->repinfo.addr, s->c->repinfo.addrlen);
log_crypto_err("remote control failed ssl");
sslconn_delete(s);
return 0;
}
}
/* once handshake has completed, check authentication */
if(SSL_get_verify_result(s->ssl) == X509_V_OK) {
X509* x = SSL_get_peer_certificate(s->ssl);
if(!x) {
verbose(VERB_DETAIL, "remote control connection "
"provided no client certificate");
sslconn_delete(s);
return 0;
}
verbose(VERB_ALGO, "remote control connection authenticated");
X509_free(x);
} else {
verbose(VERB_DETAIL, "remote control connection failed to "
"authenticate with client certificate");
sslconn_delete(s);
return 0;
}
/* set to read state */
s->line_state = command_read;
if(s->shake_state == rc_hs_write)
comm_point_listen_for_rw(c, 1, 0);
s->shake_state = rc_hs_none;
ldns_buffer_clear(s->buffer);
} else if(s->shake_state == rc_hs_want_write) {
/* we have satisfied the condition that the socket is
* writable, remove the handshake state, and continue */
comm_point_listen_for_rw(c, 1, 0); /* back to reading */
s->shake_state = rc_hs_none;
} else if(s->shake_state == rc_hs_want_read) {
/* we have satisfied the condition that the socket is
* readable, remove the handshake state, and continue */
comm_point_listen_for_rw(c, 1, 1); /* back to writing */
s->shake_state = rc_hs_none;
} else if(s->shake_state == rc_hs_shutdown) {
sslconn_shutdown(s);
}
if(s->line_state == command_read) {
if(!sslconn_readline(s))
return 0;
/* we are done handle it */
sslconn_command(s);
} else if(s->line_state == persist_read) {
do {
if(!sslconn_readline(s))
return 0;
/* we are done handle it */
sslconn_persist_command(s);
/* there may be more to read in the same SSL packet */
} while(SSL_pending(s->ssl) != 0);
} else if(s->line_state == persist_write) {
if(sslconn_checkclose(s))
return 0;
if(!sslconn_write(s))
return 0;
if(s->fetch_another_update) {
s->fetch_another_update = 0;
send_results_to_con(global_svr, s);
return 0;
}
/* nothing more to write */
if(s->close_me) {
sslconn_shutdown(s);
return 0;
}
comm_point_listen_for_rw(c, 1, 0);
s->line_state = persist_write_checkclose;
} else if(s->line_state == persist_write_checkclose) {
(void)sslconn_checkclose(s);
}
return 0;
}
static int sslconn_readline(struct sslconn* sc)
{
int r;
while(ldns_buffer_available(sc->buffer, 1)) {
ERR_clear_error();
if((r=SSL_read(sc->ssl, ldns_buffer_current(sc->buffer), 1))
<= 0) {
int want = SSL_get_error(sc->ssl, r);
if(want == SSL_ERROR_ZERO_RETURN) {
sslconn_shutdown(sc);
return 0;
} else if(want == SSL_ERROR_WANT_READ) {
return 0;
} else if(want == SSL_ERROR_WANT_WRITE) {
sc->shake_state = rc_hs_want_write;
comm_point_listen_for_rw(sc->c, 0, 1);
return 0;
} else if(want == SSL_ERROR_SYSCALL) {
if(ERR_peek_error()) {
char errbuf[128];
ERR_error_string_n(ERR_get_error(),
errbuf, sizeof(errbuf));
log_err("ssl_read: %s", errbuf);
} else if(r == 0) {
log_err("ssl_read EOF violation");
} else if(r == -1) {
#ifdef USE_WINSOCK
int wsar = WSAGetLastError();
/* conn reset common at restarts */
if(wsar == WSAECONNRESET)
verbose(VERB_ALGO,
"ssl_read syscall: %s",
wsa_strerror(wsar));
else log_err("ssl_read syscall: "
"%s, wsa: %s", strerror(errno),
wsa_strerror(wsar));
#else
log_err("ssl_read syscall: %s",
strerror(errno));
#endif
} else log_err("ssl_read syscall ret %d", r);
sslconn_delete(sc);
return 0;
}
log_crypto_err("could not SSL_read");
sslconn_delete(sc);
return 0;
}
if(ldns_buffer_current(sc->buffer)[0] == '\n') {
/* return string without \n */
ldns_buffer_write_u8(sc->buffer, 0);
ldns_buffer_flip(sc->buffer);
return 1;
}
ldns_buffer_skip(sc->buffer, 1);
}
log_err("ssl readline too long");
sslconn_delete(sc);
return 0;
}
static int sslconn_write(struct sslconn* sc)
{
int r;
/* ignore return, if fails we may simply block */
(void)SSL_set_mode(sc->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE);
while(ldns_buffer_remaining(sc->buffer)>0) {
ERR_clear_error();
if((r=SSL_write(sc->ssl, ldns_buffer_current(sc->buffer),
(int)ldns_buffer_remaining(sc->buffer)))
<= 0) {
int want = SSL_get_error(sc->ssl, r);
if(want == SSL_ERROR_ZERO_RETURN) {
/* the other side has closed the channel */
verbose(VERB_ALGO, "result write closed");
sslconn_delete(sc);
return 0;
} else if(want == SSL_ERROR_WANT_READ) {
sc->shake_state = rc_hs_want_read;
comm_point_listen_for_rw(sc->c, 1, 0);
return 0;
} else if(want == SSL_ERROR_WANT_WRITE) {
return 0;
} else if(want == SSL_ERROR_SYSCALL) {
if(ERR_peek_error()) {
char errbuf[128];
ERR_error_string_n(ERR_get_error(),
errbuf, sizeof(errbuf));
log_err("ssl_write: %s", errbuf);
} else if(r == 0) {
log_err("ssl_write EOF violation");
} else if(r == -1) {
#ifdef USE_WINSOCK
log_err("ssl_write syscall: "
"%s, wsa: %s", strerror(errno),
wsa_strerror(WSAGetLastError()));
#else
log_err("ssl_write syscall: %s",
strerror(errno));
#endif
} else log_err("ssl_write syscall ret %d", r);
sslconn_delete(sc);
return 0;
}
log_crypto_err("could not SSL_write");
/* the other side has closed the channel */
sslconn_delete(sc);
return 0;
}
ldns_buffer_skip(sc->buffer, (ssize_t)r);
}
/* done writing the buffer. */
return 1;
}
static void sslconn_shutdown(struct sslconn* sc)
{
int r = SSL_shutdown(sc->ssl);
if(r > 0) {
sslconn_delete(sc);
} else if(r == 0) {
/* we do not need to get notify from the peer, since we
* close the fd */
sslconn_delete(sc);
} else {
int want = SSL_get_error(sc->ssl, r);
sc->shake_state = rc_hs_shutdown;
if(want == SSL_ERROR_ZERO_RETURN) {
sslconn_delete(sc);
} else if(want == SSL_ERROR_WANT_READ) {
comm_point_listen_for_rw(sc->c, 1, 0);
} else if(want == SSL_ERROR_WANT_WRITE) {
comm_point_listen_for_rw(sc->c, 0, 1);
} else {
log_crypto_err("could not SSL_shutdown");
sslconn_delete(sc);
}
}
}
static int sslconn_checkclose(struct sslconn* sc)
{
int r;
ERR_clear_error();
if((r=SSL_read(sc->ssl, NULL, 0)) <= 0) {
int want = SSL_get_error(sc->ssl, r);
if(want == SSL_ERROR_ZERO_RETURN) {
verbose(VERB_ALGO, "checked channel closed otherside");
sslconn_shutdown(sc);
return 1;
} else if(want == SSL_ERROR_WANT_READ) {
return 0;
} else if(want == SSL_ERROR_WANT_WRITE) {
sc->shake_state = rc_hs_want_write;
comm_point_listen_for_rw(sc->c, 0, 1);
return 0;
} else if(want == SSL_ERROR_SYSCALL) {
if(ERR_peek_error()) {
char errbuf[128];
ERR_error_string_n(ERR_get_error(),
errbuf, sizeof(errbuf));
log_err("checkclose ssl_read: %s", errbuf);
} else if(r == 0) {
log_err("checkclose ssl_read EOF violation");
} else if(r == -1) {
#ifdef USE_WINSOCK
int wsar = WSAGetLastError();
/* connreset common at restart of system */
if(wsar == WSAECONNRESET)
verbose(VERB_ALGO,
"checkclose ssl_read syscall: %s",
wsa_strerror(wsar));
else log_err("checkclose ssl_read syscall: "
"%s, wsa: %s", strerror(errno),
wsa_strerror(WSAGetLastError()));
#else
log_err("checkclose ssl_read syscall: %s",
strerror(errno));
#endif
} else log_err("checkclose ssl_read syscall ret %d",
r);
sslconn_delete(sc);
return 0;
}
log_crypto_err("checkclose could not SSL_read");
sslconn_delete(sc);
return 1;
}
if(SSL_get_shutdown(sc->ssl)) {
verbose(VERB_ALGO, "checked channel closed");
sslconn_delete(sc);
return 1;
}
return 0;
}
static void persist_cmd_insecure(int val)
{
struct svr* svr = global_svr;
int was_insecure = svr->insecure_state;
svr->insecure_state = val;
/* see if we need to change unbound's settings */
if(svr->res_state == res_dark) {
if(!was_insecure && val) {
/* set resolv.conf to the DHCP IP list */
hook_resolv_iplist(svr->cfg, svr->probes);
} else if(was_insecure && !val) {
/* set resolv.conf to 127.0.0.1 */
hook_resolv_localhost(svr->cfg);
}
} else {
/* no need for insecure; robustness, in case some delayed
* command arrives when we have reprobed again */
if(!svr->forced_insecure)
svr->insecure_state = 0;
}
svr_send_results(svr);
}
void cmd_reprobe(void)
{
char buf[10240];
char* now = buf;
size_t left = sizeof(buf);
struct probe_ip* p;
buf[0]=0; /* safe, robust */
for(p = global_svr->probes; p; p = p->next) {
if(probe_is_cache(p)) {
int len;
if(left < strlen(p->name)+3)
break; /* no space for more */
snprintf(now, left, "%s%s",
(now==buf)?"":" ", p->name);
len = strlen(now);
left -= len;
now += len;
}
}
probe_start(buf);
}
static void handle_hotspot_signon_cmd(struct svr* svr)
{
verbose(VERB_OPS, "state dark forced_insecure");
probe_setup_hotspot_signon(svr);
svr_send_results(svr);
}
static void handle_skip_http_cmd(void)
{
verbose(VERB_OPS, "state skip_http and reprobe");
global_svr->skip_http = 1;
cmd_reprobe();
}
static void sslconn_persist_command(struct sslconn* sc)
{
char* str = (char*)ldns_buffer_begin(sc->buffer);
while(*str == ' ')
str++;
verbose(VERB_ALGO, "persist-channel command: %s", str);
if(*str == 0) {
/* ignore empty lines */
} else if(strcmp(str, "insecure yes") == 0) {
persist_cmd_insecure(1);
} else if(strcmp(str, "insecure no") == 0) {
persist_cmd_insecure(0);
} else if(strcmp(str, "reprobe") == 0) {
global_svr->forced_insecure = 0;
global_svr->http_insecure = 0;
cmd_reprobe();
} else if(strcmp(str, "skip_http") == 0) {
handle_skip_http_cmd();
} else if(strcmp(str, "hotspot_signon") == 0) {
handle_hotspot_signon_cmd(global_svr);
} else if(strcmp(str, "update_cancel") == 0) {
selfupdate_userokay(global_svr->update, 0);
} else if(strcmp(str, "update_ok") == 0) {
selfupdate_userokay(global_svr->update, 1);
} else {
log_err("unknown command from panel: %s", str);
}
/* and ready to read the next command */
ldns_buffer_clear(sc->buffer);
}
static void handle_submit(char* ips)
{
/* start probing the servers */
probe_start(ips);
}
/** append update signal to buffer to send */
static void
append_update_to_con(struct sslconn* s, char* version_available)
{
ldns_buffer_printf(s->buffer, "update %s\n%s\n\n", PACKAGE_VERSION,
version_available);
}
static void
send_results_to_con(struct svr* svr, struct sslconn* s)
{
struct probe_ip* p;
char at[32];
int numcache = 0, unfinished = 0;
ldns_buffer_clear(s->buffer);
if(svr->probetime == 0)
ldns_buffer_printf(s->buffer, "at (no probe performed)\n");
else if(strftime(at, sizeof(at), "%Y-%m-%d %H:%M:%S",
localtime(&svr->probetime)))
ldns_buffer_printf(s->buffer, "at %s\n", at);
for(p=svr->probes; p; p=p->next) {
if(probe_is_cache(p))
numcache++;
if(!p->finished) {
unfinished++;
continue;
}
if(p->to_http) {
if(p->host_c) {
ldns_buffer_printf(s->buffer, "%s %s %s from %s: %s %s\n",
"addr", p->host_c->qname,
p->http_ip6?"AAAA":"A", p->name,
p->works?"OK":"error", p->reason?p->reason:"");
} else
ldns_buffer_printf(s->buffer, "%s %s (%s): %s %s\n",
"http", p->http_desc, p->name,
p->works?"OK":"error", p->reason?p->reason:"");
} else if(p->dnstcp)
ldns_buffer_printf(s->buffer, "%s%d %s: %s %s\n",
p->ssldns?"ssl":"tcp", p->port, p->name,
p->works?"OK":"error", p->reason?p->reason:"");
else
ldns_buffer_printf(s->buffer, "%s %s: %s %s\n",
p->to_auth?"authority":"cache", p->name,
p->works?"OK":"error", p->reason?p->reason:"");
}
if(unfinished)
ldns_buffer_printf(s->buffer, "probe is in progress\n");
else if(!numcache)
ldns_buffer_printf(s->buffer, "no cache: no DNS servers have been supplied via DHCP\n");
ldns_buffer_printf(s->buffer, "state: %s %s%s%s\n",
svr->res_state==res_cache?"cache":(
svr->res_state==res_tcp?"tcp":(
svr->res_state==res_ssl?"ssl":(
svr->res_state==res_auth?"auth":(
svr->res_state==res_disconn?"disconnected":"nodnssec")))),
svr->insecure_state?"insecure_mode":"secure",
svr->forced_insecure?" forced_insecure":"",
svr->http_insecure?" http_insecure":""
);
ldns_buffer_printf(s->buffer, "\n");
if(svr->update && svr->update->update_available &&
!svr->update->user_replied) {
log_info("append_update signal");
append_update_to_con(s, svr->update->version_available);
}
ldns_buffer_flip(s->buffer);
comm_point_listen_for_rw(s->c, 1, 1);
s->line_state = persist_write;
}
void svr_signal_update(struct svr* svr, char* version_available)
{
/* write stop to all connected panels */
struct sslconn* s;
for(s=svr->busy_list; s; s=s->next) {
if(s->line_state == persist_write) {
/* busy with last results, fetch update later */
s->fetch_another_update=1;
}
if(s->line_state == persist_write_checkclose) {
ldns_buffer_clear(s->buffer);
append_update_to_con(s, version_available);
ldns_buffer_flip(s->buffer);
comm_point_listen_for_rw(s->c, 1, 1);
s->line_state = persist_write;
}
}
}
static void handle_results_cmd(struct sslconn* sc)
{
/* turn into persist write with results. */
ldns_buffer_clear(sc->buffer);
ldns_buffer_flip(sc->buffer);
/* must listen for close of connection: reading */
comm_point_listen_for_rw(sc->c, 1, 0);
sc->line_state = persist_write_checkclose;
/* feed it the first results (if any) */
send_results_to_con(global_svr, sc);
}
static void handle_status_cmd(struct sslconn* sc)
{
sc->close_me = 1;
handle_results_cmd(sc);
}
static void handle_printclose(struct sslconn* sc, char* str)
{
/* write and then close */
sc->close_me = 1;
comm_point_listen_for_rw(sc->c, 1, 1);
sc->line_state = persist_write;
/* enter contents */
ldns_buffer_clear(sc->buffer);
ldns_buffer_printf(sc->buffer, "%s\n", str);
ldns_buffer_flip(sc->buffer);
}
static void handle_cmdtray_cmd(struct sslconn* sc)
{
#ifdef HOOKS_OSX
/* OSX has messed up resolv.conf after relogin */
restore_resolv_osx(global_svr->cfg);
#endif
/* turn into persist read */
ldns_buffer_clear(sc->buffer);
comm_point_listen_for_rw(sc->c, 1, 0);
sc->line_state = persist_read;
}
static void handle_unsafe_cmd(struct sslconn* sc)
{
probe_unsafe_test();
sslconn_shutdown(sc);
}
static void handle_test_tcp_cmd(struct sslconn* sc)
{
probe_tcp_test();
sslconn_shutdown(sc);
}
static void handle_test_ssl_cmd(struct sslconn* sc)
{
probe_ssl_test();
sslconn_shutdown(sc);
}
static void handle_test_http_cmd(struct sslconn* sc)
{
probe_http_test();
sslconn_shutdown(sc);
}
static void handle_test_update_cmd(struct sslconn* sc)
{
global_svr->update->test_flag = 1;
global_svr->update_desired = 1;
sslconn_shutdown(sc);
}
static void handle_stoppanels_cmd(struct sslconn* sc)
{
/* write stop to all connected panels */
const char* stopcmd = "stop\n";
struct sslconn* s;
for(s=global_svr->busy_list; s; s=s->next) {
/* skip non persistent-write connections */
if(s->line_state != persist_write_checkclose &&
s->line_state != persist_write)
continue;
(void)SSL_set_mode(s->ssl, SSL_MODE_AUTO_RETRY);
if(SSL_get_fd(s->ssl) != -1) {
#ifdef USE_WINSOCK
/* to be able to set it back to blocking mode
* we have to remove the EventSelect on it */
if(WSAEventSelect(SSL_get_fd(s->ssl), NULL, 0)!=0)
log_err("WSAEventSelect disable: %s",
wsa_strerror(WSAGetLastError()));
#endif
fd_set_block(SSL_get_fd(s->ssl));
}
if(s->line_state == persist_write) {
/* busy with last results, blocking write them */
if(SSL_write(s->ssl, ldns_buffer_current(s->buffer),
(int)ldns_buffer_remaining(s->buffer)) < 0)
log_crypto_err("cannot SSL_write remainder");
}
/* blocking write the stop command */
if(SSL_write(s->ssl, stopcmd, (int)strlen(stopcmd)) < 0)
log_crypto_err("cannot SSL_write panel stop");
if(!SSL_get_shutdown(s->ssl)) {
if(SSL_shutdown(s->ssl) == 0)
SSL_shutdown(s->ssl); /* again to wait */
}
/* it will be closed now */
if(SSL_get_fd(s->ssl) != -1)
fd_set_nonblock(SSL_get_fd(s->ssl));
comm_point_listen_for_rw(s->c, 1, 0);
s->line_state = persist_write_checkclose;
}
/* wait until they all stopped, then stop commanding connection */
sslconn_shutdown(sc);
}
static void sslconn_command(struct sslconn* sc)
{
char header[10];
char* str = (char*)ldns_buffer_begin(sc->buffer);
snprintf(header, sizeof(header), "DNSTRIG%d ", CONTROL_VERSION);
if(strncmp(str, header, strlen(header)) != 0) {
log_err("bad version in control connection");
sslconn_delete(sc);
return;
}
str += strlen(header);
while(*str == ' ')
str++;
verbose(VERB_ALGO, "command: %s", str);
if(strncmp(str, "submit", 6) == 0) {
handle_submit(str+6);
sslconn_shutdown(sc);
} else if(strncmp(str, "reprobe", 7) == 0) {
global_svr->forced_insecure = 0;
global_svr->http_insecure = 0;
cmd_reprobe();
sslconn_shutdown(sc);
} else if(strncmp(str, "skip_http", 9) == 0) {
handle_skip_http_cmd();
sslconn_shutdown(sc);
} else if(strncmp(str, "hotspot_signon", 14) == 0) {
handle_hotspot_signon_cmd(global_svr);
sslconn_shutdown(sc);
} else if(strncmp(str, "results", 7) == 0) {
handle_results_cmd(sc);
} else if(strncmp(str, "status", 7) == 0) {
handle_status_cmd(sc);
} else if(strncmp(str, "cmdtray", 7) == 0) {
handle_cmdtray_cmd(sc);
} else if(strncmp(str, "unsafe", 6) == 0) {
handle_unsafe_cmd(sc);
} else if(strncmp(str, "test_tcp", 8) == 0) {
handle_test_tcp_cmd(sc);
} else if(strncmp(str, "test_ssl", 8) == 0) {
handle_test_ssl_cmd(sc);
} else if(strncmp(str, "test_http", 8) == 0) {
handle_test_http_cmd(sc);
} else if(strncmp(str, "test_update", 11) == 0) {
handle_test_update_cmd(sc);
} else if(strncmp(str, "stoppanels", 10) == 0) {
handle_stoppanels_cmd(sc);
} else if(strncmp(str, "stop", 4) == 0) {
comm_base_exit(global_svr->base);
sslconn_shutdown(sc);
} else {
verbose(VERB_DETAIL, "unknown command: %s", str);
handle_printclose(sc, "error unknown command");
}
}
void svr_send_results(struct svr* svr)
{
struct sslconn* s;
for(s=svr->busy_list; s; s=s->next) {
if(s->line_state == persist_write) {
/* busy with last results, fetch update later */
s->fetch_another_update=1;
}
if(s->line_state == persist_write_checkclose) {
send_results_to_con(svr, s);
}
}
}
void svr_retry_callback(void* arg)
{
struct svr* svr = (struct svr*)arg;
if(!svr->retry_timer_enabled) {
comm_timer_disable(svr->retry_timer);
return;
}
verbose(VERB_ALGO, "retry timeout");
cmd_reprobe();
}
static void svr_retry_setit(struct svr* svr)
{
struct timeval tv;
if(svr->retry_timer_count < RETRY_TIMER_COUNT_MAX)
verbose(VERB_ALGO, "retry in %d seconds (try nr %d)", svr->retry_timer_timeout, svr->retry_timer_count);
else verbose(VERB_ALGO, "retry in %d seconds", svr->retry_timer_timeout);
tv.tv_sec = svr->retry_timer_timeout;
tv.tv_usec = 0;
comm_timer_set(svr->retry_timer, &tv);
}
static void svr_retry_start(struct svr* svr, int http_mode)
{
svr->retry_timer_timeout = RETRY_TIMER_START;
if(http_mode)
svr->retry_timer_count = 1;
else svr->retry_timer_count = RETRY_TIMER_COUNT_MAX;
svr->retry_timer_enabled = 1;
svr_retry_setit(svr);
}
void svr_retry_timer_next(int http_mode)
{
struct svr* svr = global_svr;
if(!svr->retry_timer_enabled) {
svr_retry_start(svr, http_mode);
return;
}
if(svr->retry_timer_count < RETRY_TIMER_COUNT_MAX) {
svr->retry_timer_count++;
} else {
svr->retry_timer_timeout *= 2;
if(svr->retry_timer_timeout > RETRY_TIMER_MAX)
svr->retry_timer_timeout = RETRY_TIMER_MAX;
}
svr_retry_setit(svr);
}
void svr_retry_timer_stop(void)
{
struct svr* svr = global_svr;
if(!svr->retry_timer_enabled)
return;
svr->retry_timer_enabled = 0;
comm_timer_disable(svr->retry_timer);
}
void svr_tcp_timer_stop(void)
{
struct svr* svr = global_svr;
comm_timer_disable(svr->retry_timer);
}
void svr_tcp_timer_enable(void)
{
struct svr* svr = global_svr;
struct timeval tv;
if(svr->tcp_timer_used)
return;
verbose(VERB_ALGO, "retry dnstcp in %d seconds", SVR_TCP_RETRY);
tv.tv_sec = SVR_TCP_RETRY;
tv.tv_usec = 0;
comm_timer_set(svr->tcp_timer, &tv);
}
void svr_tcp_callback(void* arg)
{
/* we do this probe because some 20 seconds after login, more
* ports may open and this can alleviate traffic on the open
* recursors */
struct svr* svr = (struct svr*)arg;
verbose(VERB_ALGO, "retry dnstcp timeout");
comm_timer_disable(svr->tcp_timer);
if(svr->res_state == res_tcp || svr->res_state == res_ssl) {
svr->tcp_timer_used = 1;
cmd_reprobe();
}
}
void svr_check_update(struct svr* svr)
{
if(svr->update_desired && !svr->insecure_state && !svr->forced_insecure
&& svr->res_state != res_dark && svr->res_state != res_disconn)
{
selfupdate_start(svr->update);
}
}
|