1 /* $OpenBSD: log.c,v 1.61 2011/04/16 10:30:29 sthen Exp $ */ 2 /* $EOM: log.c,v 1.30 2000/09/29 08:19:23 niklas Exp $ */ 3 4 /* 5 * Copyright (c) 1998, 1999, 2001 Niklas Hallqvist. All rights reserved. 6 * Copyright (c) 1999, 2000, 2001, 2003 H�kan Olsson. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * This code was written under funding by Ericsson Radio Systems. 31 */ 32 33 #include <sys/types.h> 34 #include <sys/time.h> 35 36 #include <sys/socket.h> 37 #include <sys/stat.h> 38 #include <sys/uio.h> 39 #include <netinet/in.h> 40 #include <netinet/in_systm.h> 41 #include <netinet/ip.h> 42 #include <netinet/ip6.h> 43 #include <netinet/udp.h> 44 #include <arpa/inet.h> 45 46 #include <pcap.h> 47 48 #include <errno.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <syslog.h> 53 #include <stdarg.h> 54 #include <unistd.h> 55 56 #include "conf.h" 57 #include "isakmp_num.h" 58 #include "log.h" 59 #include "monitor.h" 60 #include "util.h" 61 62 static void _log_print(int, int, const char *, va_list, int, int); 63 64 static FILE *log_output; 65 66 int verbose_logging = 0; 67 static int log_level[LOG_ENDCLASS]; 68 69 #define TCPDUMP_MAGIC 0xa1b2c3d4 70 #define SNAPLEN (64 * 1024) 71 72 struct packhdr { 73 struct pcap_pkthdr pcap;/* pcap file packet header */ 74 u_int32_t sa_family; /* address family */ 75 union { 76 struct ip ip4; /* IPv4 header (w/o options) */ 77 struct ip6_hdr ip6; /* IPv6 header */ 78 } ip; 79 }; 80 81 struct isakmp_hdr { 82 u_int8_t icookie[8], rcookie[8]; 83 u_int8_t next, ver, type, flags; 84 u_int32_t msgid, len; 85 }; 86 87 static char *pcaplog_file = NULL; 88 static FILE *packet_log; 89 static u_int8_t *packet_buf = NULL; 90 91 static int udp_cksum(struct packhdr *, const struct udphdr *, 92 u_int16_t *); 93 static u_int16_t in_cksum(const u_int16_t *, int); 94 95 void 96 log_init(int debug) 97 { 98 if (debug) 99 log_output = stderr; 100 else 101 log_to(0); /* syslog */ 102 } 103 104 void 105 log_reinit(void) 106 { 107 struct conf_list *logging; 108 struct conf_list_node *logclass; 109 int class, level; 110 111 logging = conf_get_list("General", "Logverbose"); 112 if (logging) { 113 verbose_logging = 1; 114 conf_free_list(logging); 115 } 116 logging = conf_get_list("General", "Loglevel"); 117 if (!logging) 118 return; 119 120 for (logclass = TAILQ_FIRST(&logging->fields); logclass; 121 logclass = TAILQ_NEXT(logclass, link)) { 122 if (sscanf(logclass->field, "%d=%d", &class, &level) != 2) { 123 if (sscanf(logclass->field, "A=%d", &level) == 1) 124 for (class = 0; class < LOG_ENDCLASS; class++) 125 log_debug_cmd(class, level); 126 else { 127 log_print("init: invalid logging class or " 128 "level: %s", logclass->field); 129 continue; 130 } 131 } else 132 log_debug_cmd(class, level); 133 } 134 conf_free_list(logging); 135 } 136 137 void 138 log_to(FILE *f) 139 { 140 if (!log_output && f) 141 closelog(); 142 log_output = f; 143 if (!f) 144 openlog("isakmpd", LOG_PID | LOG_CONS, LOG_DAEMON); 145 } 146 147 FILE * 148 log_current(void) 149 { 150 return log_output; 151 } 152 153 static char * 154 _log_get_class(int error_class) 155 { 156 /* XXX For test purposes. To be removed later on? */ 157 static char *class_text[] = LOG_CLASSES_TEXT; 158 159 if (error_class < 0) 160 return "Dflt"; 161 else if (error_class >= LOG_ENDCLASS) 162 return "Unkn"; 163 else 164 return class_text[error_class]; 165 } 166 167 static void 168 _log_print(int error, int syslog_level, const char *fmt, va_list ap, 169 int class, int level) 170 { 171 char buffer[LOG_SIZE], nbuf[LOG_SIZE + 32]; 172 static const char fallback_msg[] = 173 "write to log file failed (errno %d), redirecting to syslog"; 174 int len; 175 struct tm *tm; 176 struct timeval now; 177 time_t t; 178 179 len = vsnprintf(buffer, sizeof buffer, fmt, ap); 180 if (len > 0 && len < (int) sizeof buffer - 1 && error) 181 snprintf(buffer + len, sizeof buffer - len, ": %s", 182 strerror(errno)); 183 if (log_output) { 184 gettimeofday(&now, 0); 185 t = now.tv_sec; 186 tm = localtime(&t); 187 if (class >= 0) 188 snprintf(nbuf, sizeof nbuf, 189 "%02d%02d%02d.%06ld %s %02d ", 190 tm->tm_hour, tm->tm_min, tm->tm_sec, now.tv_usec, 191 _log_get_class(class), level); 192 else /* LOG_PRINT (-1) or LOG_REPORT (-2) */ 193 snprintf(nbuf, sizeof nbuf, "%02d%02d%02d.%06ld %s ", 194 tm->tm_hour, tm->tm_min, tm->tm_sec, now.tv_usec, 195 class == LOG_PRINT ? "Default" : "Report>"); 196 strlcat(nbuf, buffer, sizeof nbuf); 197 strlcat(nbuf, getuid() ? "" : " [priv]", LOG_SIZE + 32); 198 strlcat(nbuf, "\n", sizeof nbuf); 199 200 if (fwrite(nbuf, strlen(nbuf), 1, log_output) == 0) { 201 /* Report fallback. */ 202 syslog(LOG_ALERT, fallback_msg, errno); 203 fprintf(log_output, fallback_msg, errno); 204 205 /* 206 * Close log_output to prevent isakmpd from locking 207 * the file. We may need to explicitly close stdout 208 * to do this properly. 209 * XXX - Figure out how to match two FILE *'s and 210 * rewrite. 211 */ 212 if (fileno(log_output) != -1 && 213 fileno(stdout) == fileno(log_output)) 214 fclose(stdout); 215 fclose(log_output); 216 217 /* Fallback to syslog. */ 218 log_to(0); 219 220 /* (Re)send current message to syslog(). */ 221 syslog(class == LOG_REPORT ? LOG_ALERT : 222 syslog_level, "%s", buffer); 223 } 224 } else 225 syslog(class == LOG_REPORT ? LOG_ALERT : syslog_level, "%s", 226 buffer); 227 } 228 229 void 230 log_debug(int cls, int level, const char *fmt, ...) 231 { 232 va_list ap; 233 234 /* 235 * If we are not debugging this class, or the level is too low, just 236 * return. 237 */ 238 if (cls >= 0 && (log_level[cls] == 0 || level > log_level[cls])) 239 return; 240 va_start(ap, fmt); 241 _log_print(0, LOG_INFO, fmt, ap, cls, level); 242 va_end(ap); 243 } 244 245 void 246 log_debug_buf(int cls, int level, const char *header, const u_int8_t *buf, 247 size_t sz) 248 { 249 size_t i, j; 250 char s[73]; 251 252 /* 253 * If we are not debugging this class, or the level is too low, just 254 * return. 255 */ 256 if (cls >= 0 && (log_level[cls] == 0 || level > log_level[cls])) 257 return; 258 259 log_debug(cls, level, "%s:", header); 260 for (i = j = 0; i < sz;) { 261 snprintf(s + j, sizeof s - j, "%02x", buf[i++]); 262 j += strlen(s + j); 263 if (i % 4 == 0) { 264 if (i % 32 == 0) { 265 s[j] = '\0'; 266 log_debug(cls, level, "%s", s); 267 j = 0; 268 } else 269 s[j++] = ' '; 270 } 271 } 272 if (j) { 273 s[j] = '\0'; 274 log_debug(cls, level, "%s", s); 275 } 276 } 277 278 void 279 log_debug_cmd(int cls, int level) 280 { 281 if (cls < 0 || cls >= LOG_ENDCLASS) { 282 log_print("log_debug_cmd: invalid debugging class %d", cls); 283 return; 284 } 285 if (level < 0) { 286 log_print("log_debug_cmd: invalid debugging level %d for " 287 "class %d", level, cls); 288 return; 289 } 290 if (level == log_level[cls]) 291 log_print("log_debug_cmd: log level unchanged for class %d", 292 cls); 293 else { 294 log_print("log_debug_cmd: log level changed from %d to %d " 295 "for class %d", log_level[cls], level, cls); 296 log_level[cls] = level; 297 } 298 } 299 300 void 301 log_debug_toggle(void) 302 { 303 static int log_level_copy[LOG_ENDCLASS], toggle = 0; 304 305 if (!toggle) { 306 LOG_DBG((LOG_MISC, 50, "log_debug_toggle: " 307 "debug levels cleared")); 308 memcpy(&log_level_copy, &log_level, sizeof log_level); 309 bzero(&log_level, sizeof log_level); 310 } else { 311 memcpy(&log_level, &log_level_copy, sizeof log_level); 312 LOG_DBG((LOG_MISC, 50, "log_debug_toggle: " 313 "debug levels restored")); 314 } 315 toggle = !toggle; 316 } 317 318 void 319 log_print(const char *fmt, ...) 320 { 321 va_list ap; 322 323 va_start(ap, fmt); 324 _log_print(0, LOG_NOTICE, fmt, ap, LOG_PRINT, 0); 325 va_end(ap); 326 } 327 328 void 329 log_verbose(const char *fmt, ...) 330 { 331 va_list ap; 332 333 if (verbose_logging == 0) 334 return; 335 336 va_start(ap, fmt); 337 _log_print(0, LOG_NOTICE, fmt, ap, LOG_PRINT, 0); 338 va_end(ap); 339 } 340 341 void 342 log_error(const char *fmt, ...) 343 { 344 va_list ap; 345 346 va_start(ap, fmt); 347 _log_print(1, LOG_ERR, fmt, ap, LOG_PRINT, 0); 348 va_end(ap); 349 } 350 351 void 352 log_errorx(const char *fmt, ...) 353 { 354 va_list ap; 355 356 va_start(ap, fmt); 357 _log_print(0, LOG_ERR, fmt, ap, LOG_PRINT, 0); 358 va_end(ap); 359 } 360 361 void 362 log_fatal(const char *fmt, ...) 363 { 364 va_list ap; 365 366 va_start(ap, fmt); 367 _log_print(1, LOG_CRIT, fmt, ap, LOG_PRINT, 0); 368 va_end(ap); 369 monitor_exit(1); 370 } 371 372 void 373 log_fatalx(const char *fmt, ...) 374 { 375 va_list ap; 376 377 va_start(ap, fmt); 378 _log_print(0, LOG_CRIT, fmt, ap, LOG_PRINT, 0); 379 va_end(ap); 380 monitor_exit(1); 381 } 382 383 void 384 log_packet_init(char *newname) 385 { 386 struct pcap_file_header sf_hdr; 387 struct stat st; 388 mode_t old_umask; 389 char *mode; 390 391 /* Allocate packet buffer first time through. */ 392 if (!packet_buf) 393 packet_buf = malloc(SNAPLEN); 394 395 if (!packet_buf) { 396 log_error("log_packet_init: malloc (%d) failed", SNAPLEN); 397 return; 398 } 399 if (pcaplog_file && strcmp(pcaplog_file, PCAP_FILE_DEFAULT) != 0) 400 free(pcaplog_file); 401 402 pcaplog_file = strdup(newname); 403 if (!pcaplog_file) { 404 log_error("log_packet_init: strdup (\"%s\") failed", newname); 405 return; 406 } 407 /* Does the file already exist? XXX lstat() or stat()? */ 408 /* XXX This is a fstat! */ 409 if (monitor_stat(pcaplog_file, &st) == 0) { 410 /* Sanity checks. */ 411 if (!S_ISREG(st.st_mode)) { 412 log_print("log_packet_init: existing capture file is " 413 "not a regular file"); 414 return; 415 } 416 if ((st.st_mode & (S_IRWXG | S_IRWXO)) != 0) { 417 log_print("log_packet_init: existing capture " 418 "file has bad modes"); 419 return; 420 } 421 /* 422 * XXX It would be nice to check if it actually is a pcap 423 * file... 424 */ 425 426 mode = "a"; 427 } else 428 mode = "w"; 429 430 old_umask = umask(S_IRWXG | S_IRWXO); 431 packet_log = monitor_fopen(pcaplog_file, mode); 432 umask(old_umask); 433 434 if (!packet_log) { 435 log_error("log_packet_init: fopen (\"%s\", \"%s\") failed", 436 pcaplog_file, mode); 437 return; 438 } 439 log_print("log_packet_init: " 440 "starting IKE packet capture to file \"%s\"", pcaplog_file); 441 442 /* If this is a new file, we need to write a PCAP header to it. */ 443 if (*mode == 'w') { 444 sf_hdr.magic = TCPDUMP_MAGIC; 445 sf_hdr.version_major = PCAP_VERSION_MAJOR; 446 sf_hdr.version_minor = PCAP_VERSION_MINOR; 447 sf_hdr.thiszone = 0; 448 sf_hdr.snaplen = SNAPLEN; 449 sf_hdr.sigfigs = 0; 450 sf_hdr.linktype = DLT_LOOP; 451 452 fwrite((char *) &sf_hdr, sizeof sf_hdr, 1, packet_log); 453 fflush(packet_log); 454 } 455 } 456 457 void 458 log_packet_restart(char *newname) 459 { 460 if (packet_log) { 461 log_print("log_packet_restart: capture already active on " 462 "file \"%s\"", pcaplog_file); 463 return; 464 } 465 if (newname) 466 log_packet_init(newname); 467 else if (!pcaplog_file) 468 log_packet_init(PCAP_FILE_DEFAULT); 469 else 470 log_packet_init(pcaplog_file); 471 } 472 473 void 474 log_packet_stop(void) 475 { 476 /* Stop capture. */ 477 if (packet_log) { 478 fclose(packet_log); 479 log_print("log_packet_stop: stopped capture"); 480 } 481 packet_log = 0; 482 } 483 484 void 485 log_packet_iov(struct sockaddr *src, struct sockaddr *dst, struct iovec *iov, 486 int iovcnt) 487 { 488 struct isakmp_hdr *isakmphdr; 489 struct packhdr hdr; 490 struct udphdr udp; 491 struct timeval tv; 492 int off, datalen, hdrlen, i, add_espmarker = 0; 493 const u_int32_t espmarker = 0; 494 495 for (i = 0, datalen = 0; i < iovcnt; i++) 496 datalen += iov[i].iov_len; 497 498 if (!packet_log || datalen > SNAPLEN) 499 return; 500 501 /* copy packet into buffer */ 502 for (i = 0, off = 0; i < iovcnt; i++) { 503 memcpy(packet_buf + off, iov[i].iov_base, iov[i].iov_len); 504 off += iov[i].iov_len; 505 } 506 507 bzero(&hdr, sizeof hdr); 508 bzero(&udp, sizeof udp); 509 510 /* isakmp - turn off the encryption bit in the isakmp hdr */ 511 isakmphdr = (struct isakmp_hdr *) packet_buf; 512 isakmphdr->flags &= ~(ISAKMP_FLAGS_ENC); 513 514 /* udp */ 515 udp.uh_sport = sockaddr_port(src); 516 udp.uh_dport = sockaddr_port(dst); 517 datalen += sizeof udp; 518 if (ntohs(udp.uh_sport) == 4500 || 519 ntohs(udp.uh_dport) == 4500) { /* XXX Quick and dirty */ 520 add_espmarker = 1; 521 datalen += sizeof espmarker; 522 } 523 udp.uh_ulen = htons(datalen); 524 525 /* ip */ 526 hdr.sa_family = htonl(src->sa_family); 527 switch (src->sa_family) { 528 default: 529 /* Assume IPv4. XXX Can 'default' ever happen here? */ 530 hdr.sa_family = htonl(AF_INET); 531 hdr.ip.ip4.ip_src.s_addr = 0x02020202; 532 hdr.ip.ip4.ip_dst.s_addr = 0x01010101; 533 /* The rest of the setup is common to AF_INET. */ 534 goto setup_ip4; 535 536 case AF_INET: 537 hdr.ip.ip4.ip_src.s_addr = 538 ((struct sockaddr_in *)src)->sin_addr.s_addr; 539 hdr.ip.ip4.ip_dst.s_addr = 540 ((struct sockaddr_in *)dst)->sin_addr.s_addr; 541 542 setup_ip4: 543 hdrlen = sizeof hdr.ip.ip4; 544 hdr.ip.ip4.ip_v = 0x4; 545 hdr.ip.ip4.ip_hl = 0x5; 546 hdr.ip.ip4.ip_p = IPPROTO_UDP; 547 hdr.ip.ip4.ip_len = htons(datalen + hdrlen); 548 /* Let's use the IP ID as a "packet counter". */ 549 i = ntohs(hdr.ip.ip4.ip_id) + 1; 550 hdr.ip.ip4.ip_id = htons(i); 551 /* Calculate IP header checksum. */ 552 hdr.ip.ip4.ip_sum = in_cksum((u_int16_t *) & hdr.ip.ip4, 553 hdr.ip.ip4.ip_hl << 2); 554 break; 555 556 case AF_INET6: 557 hdrlen = sizeof(hdr.ip.ip6); 558 hdr.ip.ip6.ip6_vfc = IPV6_VERSION; 559 hdr.ip.ip6.ip6_nxt = IPPROTO_UDP; 560 hdr.ip.ip6.ip6_plen = udp.uh_ulen; 561 memcpy(&hdr.ip.ip6.ip6_src, 562 &((struct sockaddr_in6 *)src)->sin6_addr, 563 sizeof hdr.ip.ip6.ip6_src); 564 memcpy(&hdr.ip.ip6.ip6_dst, 565 &((struct sockaddr_in6 *)dst)->sin6_addr, 566 sizeof hdr.ip.ip6.ip6_dst); 567 break; 568 } 569 570 /* Calculate UDP checksum. */ 571 udp.uh_sum = udp_cksum(&hdr, &udp, (u_int16_t *) packet_buf); 572 hdrlen += sizeof hdr.sa_family; 573 574 /* pcap file packet header */ 575 gettimeofday(&tv, 0); 576 hdr.pcap.ts.tv_sec = tv.tv_sec; 577 hdr.pcap.ts.tv_usec = tv.tv_usec; 578 hdr.pcap.caplen = datalen + hdrlen; 579 hdr.pcap.len = datalen + hdrlen; 580 581 hdrlen += sizeof(struct pcap_pkthdr); 582 datalen -= sizeof(struct udphdr); 583 584 /* Write to pcap file. */ 585 fwrite(&hdr, hdrlen, 1, packet_log); /* pcap + IP */ 586 fwrite(&udp, sizeof(struct udphdr), 1, packet_log); /* UDP */ 587 if (add_espmarker) { 588 fwrite(&espmarker, sizeof espmarker, 1, packet_log); 589 datalen -= sizeof espmarker; 590 } 591 fwrite(packet_buf, datalen, 1, packet_log); /* IKE-data */ 592 fflush(packet_log); 593 } 594 595 /* Copied from tcpdump/print-udp.c, mostly rewritten. */ 596 static int 597 udp_cksum(struct packhdr *hdr, const struct udphdr *u, u_int16_t *d) 598 { 599 struct ip *ip4; 600 struct ip6_hdr *ip6; 601 int i, hdrlen, tlen = ntohs(u->uh_ulen) - sizeof(struct udphdr); 602 603 union phu { 604 struct ip4pseudo { 605 struct in_addr src; 606 struct in_addr dst; 607 u_int8_t z; 608 u_int8_t proto; 609 u_int16_t len; 610 } ip4p; 611 struct ip6pseudo { 612 struct in6_addr src; 613 struct in6_addr dst; 614 u_int32_t plen; 615 u_int16_t z0; 616 u_int8_t z1; 617 u_int8_t nxt; 618 } ip6p; 619 u_int16_t pa[20]; 620 } phu; 621 const u_int16_t *sp; 622 u_int32_t sum; 623 624 /* Setup pseudoheader. */ 625 bzero(phu.pa, sizeof phu); 626 switch (ntohl(hdr->sa_family)) { 627 case AF_INET: 628 ip4 = &hdr->ip.ip4; 629 memcpy(&phu.ip4p.src, &ip4->ip_src, sizeof(struct in_addr)); 630 memcpy(&phu.ip4p.dst, &ip4->ip_dst, sizeof(struct in_addr)); 631 phu.ip4p.proto = ip4->ip_p; 632 phu.ip4p.len = u->uh_ulen; 633 hdrlen = sizeof phu.ip4p; 634 break; 635 636 case AF_INET6: 637 ip6 = &hdr->ip.ip6; 638 memcpy(&phu.ip6p.src, &ip6->ip6_src, sizeof(phu.ip6p.src)); 639 memcpy(&phu.ip6p.dst, &ip6->ip6_dst, sizeof(phu.ip6p.dst)); 640 phu.ip6p.plen = u->uh_ulen; 641 phu.ip6p.nxt = ip6->ip6_nxt; 642 hdrlen = sizeof phu.ip6p; 643 break; 644 645 default: 646 return 0; 647 } 648 649 /* IPv6 wants a 0xFFFF checksum "on error", not 0x0. */ 650 if (tlen < 0) 651 return (ntohl(hdr->sa_family) == AF_INET ? 0 : 0xFFFF); 652 653 sum = 0; 654 for (i = 0; i < hdrlen; i += 2) 655 sum += phu.pa[i / 2]; 656 657 sp = (const u_int16_t *)u; 658 for (i = 0; i < (int)sizeof(struct udphdr); i += 2) 659 sum += *sp++; 660 661 sp = d; 662 for (i = 0; i < (tlen & ~1); i += 2) 663 sum += *sp++; 664 665 if (tlen & 1) 666 sum += htons((*(const char *)sp) << 8); 667 668 while (sum > 0xffff) 669 sum = (sum & 0xffff) + (sum >> 16); 670 sum = ~sum & 0xffff; 671 672 return sum; 673 } 674 675 /* Copied from tcpdump/print-ip.c, modified. */ 676 static u_int16_t 677 in_cksum(const u_int16_t *w, int len) 678 { 679 int nleft = len, sum = 0; 680 u_int16_t answer; 681 682 while (nleft > 1) { 683 sum += *w++; 684 nleft -= 2; 685 } 686 if (nleft == 1) 687 sum += htons(*(const u_char *)w << 8); 688 689 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ 690 sum += (sum >> 16); /* add carry */ 691 answer = ~sum; /* truncate to 16 bits */ 692 return answer; 693 } 694