/* $OpenBSD: log.c,v 1.27 2002/02/19 19:39:38 millert Exp $ */ /* $EOM: log.c,v 1.30 2000/09/29 08:19:23 niklas Exp $ */ /* * Copyright (c) 1998, 1999, 2001 Niklas Hallqvist. All rights reserved. * Copyright (c) 1999, 2000, 2001 Håkan Olsson. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Ericsson Radio Systems. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /* * This code was written under funding by Ericsson Radio Systems. */ #include #include #ifdef USE_DEBUG #include #include #include #include #include #include #include #include #include #ifdef HAVE_PCAP #include #else #include "sysdep/common/pcap.h" #endif #endif /* USE_DEBUG */ #include #include #include #include #include #include #include "isakmp_num.h" #include "log.h" static void _log_print (int, int, const char *, va_list, int, int); static FILE *log_output; #ifdef USE_DEBUG static int log_level[LOG_ENDCLASS]; #define TCPDUMP_MAGIC 0xa1b2c3d4 #define SNAPLEN (64 * 1024) struct packhdr { struct pcap_pkthdr pcap; /* pcap file packet header */ u_int32_t sa_family; /* address family */ union { struct ip ip4; /* IPv4 header (w/o options) */ struct ip6_hdr ip6; /* IPv6 header */ } ip; }; struct isakmp_hdr { u_int8_t icookie[8], rcookie[8]; u_int8_t next, ver, type, flags; u_int32_t msgid, len; }; static char *pcaplog_file = NULL; static FILE *packet_log; static u_int8_t *packet_buf = NULL; static int udp_cksum (struct packhdr *, const struct udphdr *, u_int16_t *); static u_int16_t in_cksum (const u_int16_t *, int); #endif /* USE_DEBUG */ void log_init (void) { log_output = stderr; } void log_to (FILE *f) { if (!log_output && f) closelog (); log_output = f; if (!f) openlog ("isakmpd", LOG_PID | LOG_CONS, LOG_DAEMON); } FILE * log_current (void) { return log_output; } static char * _log_get_class (int error_class) { /* XXX For test purposes. To be removed later on? */ static char *class_text[] = LOG_CLASSES_TEXT; if (error_class < 0) return "Dflt"; else if (error_class >= LOG_ENDCLASS) return "Unkn"; else return class_text[error_class]; } static void _log_print (int error, int syslog_level, const char *fmt, va_list ap, int class, int level) { char buffer[LOG_SIZE], nbuf[LOG_SIZE + 32]; static const char fallback_msg[] = "write to log file failed (errno %d), redirecting output to syslog"; int len; struct tm *tm; struct timeval now; time_t t; len = vsnprintf (buffer, LOG_SIZE, fmt, ap); if (len > 0 && len < LOG_SIZE - 1 && error) snprintf (buffer + len, LOG_SIZE - len, ": %s", strerror (errno)); if (log_output) { gettimeofday (&now, 0); t = now.tv_sec; tm = localtime (&t); if (class >= 0) snprintf (nbuf, LOG_SIZE + 32, "%02d%02d%02d.%06ld %s %02d ", tm->tm_hour, tm->tm_min, tm->tm_sec, now.tv_usec, _log_get_class (class), level); else /* LOG_PRINT (-1) or LOG_REPORT (-2) */ snprintf (nbuf, LOG_SIZE + 32, "%02d%02d%02d.%06ld %s ", tm->tm_hour, tm->tm_min, tm->tm_sec, now.tv_usec, class == LOG_PRINT ? "Default" : "Report>"); strlcat (nbuf, buffer, LOG_SIZE + 32); strlcat (nbuf, "\n", LOG_SIZE + 32); if (fwrite (nbuf, strlen (nbuf), 1, log_output) == 0) { /* Report fallback. */ syslog (LOG_ALERT, fallback_msg, errno); fprintf (log_output, fallback_msg, errno); /* * Close log_output to prevent isakmpd from locking the file. * We may need to explicitly close stdout to do this properly. * XXX - Figure out how to match two FILE *'s and rewrite. */ if (fileno (log_output) != -1 && fileno (stdout) == fileno (log_output)) fclose (stdout); fclose (log_output); /* Fallback to syslog. */ log_to (0); /* (Re)send current message to syslog(). */ syslog (class == LOG_REPORT ? LOG_ALERT : syslog_level, "%s", buffer); } } else syslog (class == LOG_REPORT ? LOG_ALERT : syslog_level, "%s", buffer); } #ifdef USE_DEBUG void log_debug (int cls, int level, const char *fmt, ...) { va_list ap; /* * If we are not debugging this class, or the level is too low, just return. */ if (cls >= 0 && (log_level[cls] == 0 || level > log_level[cls])) return; va_start (ap, fmt); _log_print (0, LOG_DEBUG, fmt, ap, cls, level); va_end (ap); } void log_debug_buf (int cls, int level, const char *header, const u_int8_t *buf, size_t sz) { char s[73]; int i, j; /* * If we are not debugging this class, or the level is too low, just return. */ if (cls >= 0 && (log_level[cls] == 0 || level > log_level[cls])) return; log_debug (cls, level, "%s:", header); for (i = j = 0; i < sz;) { snprintf (s + j, 73 - j, "%02x", buf[i++]); j += 2; if (i % 4 == 0) { if (i % 32 == 0) { s[j] = '\0'; log_debug (cls, level, "%s", s); j = 0; } else s[j++] = ' '; } } if (j) { s[j] = '\0'; log_debug (cls, level, "%s", s); } } void log_debug_cmd (int cls, int level) { if (cls < 0 || cls >= LOG_ENDCLASS) { log_print ("log_debug_cmd: invalid debugging class %d", cls); return; } if (level < 0) { log_print ("log_debug_cmd: invalid debugging level %d for class %d", level, cls); return; } if (level == log_level[cls]) log_print ("log_debug_cmd: log level unchanged for class %d", cls); else { log_print ("log_debug_cmd: log level changed from %d to %d for class %d", log_level[cls], level, cls); log_level[cls] = level; } } void log_debug_toggle (void) { static int log_level_copy[LOG_ENDCLASS], toggle = 0; if (!toggle) { LOG_DBG ((LOG_MISC, 50, "log_debug_toggle: debug levels cleared")); memcpy (&log_level_copy, &log_level, sizeof log_level); memset (&log_level, 0, sizeof log_level); } else { memcpy (&log_level, &log_level_copy, sizeof log_level); LOG_DBG ((LOG_MISC, 50, "log_debug_toggle: debug levels restored")); } toggle = !toggle; } #endif /* USE_DEBUG */ void log_print (const char *fmt, ...) { va_list ap; va_start (ap, fmt); _log_print (0, LOG_NOTICE, fmt, ap, LOG_PRINT, 0); va_end (ap); } void log_error (const char *fmt, ...) { va_list ap; va_start (ap, fmt); _log_print (1, LOG_ERR, fmt, ap, LOG_PRINT, 0); va_end (ap); } void log_fatal (const char *fmt, ...) { va_list ap; va_start (ap, fmt); _log_print (1, LOG_CRIT, fmt, ap, LOG_PRINT, 0); va_end (ap); exit (1); } #ifdef USE_DEBUG void log_packet_init (char *newname) { struct pcap_file_header sf_hdr; mode_t old_umask; /* Allocate packet buffer first time through. */ if (!packet_buf) packet_buf = malloc (SNAPLEN); if (!packet_buf) { log_error ("log_packet_init: malloc (%d) failed", SNAPLEN); return; } if (pcaplog_file && strcmp (pcaplog_file, PCAP_FILE_DEFAULT) != 0) free (pcaplog_file); pcaplog_file = strdup (newname); if (!pcaplog_file) { log_error ("log_packet_init: strdup (\"%s\") failed", newname); return; } old_umask = umask (S_IRWXG | S_IRWXO); packet_log = fopen (pcaplog_file, "w"); umask (old_umask); if (!packet_log) { log_error ("log_packet_init: fopen (\"%s\", \"w\") failed", pcaplog_file); return; } log_print ("log_packet_init: starting IKE packet capture to file \"%s\"", pcaplog_file); sf_hdr.magic = TCPDUMP_MAGIC; sf_hdr.version_major = PCAP_VERSION_MAJOR; sf_hdr.version_minor = PCAP_VERSION_MINOR; sf_hdr.thiszone = 0; sf_hdr.snaplen = SNAPLEN; sf_hdr.sigfigs = 0; sf_hdr.linktype = DLT_NULL; fwrite ((char *)&sf_hdr, sizeof sf_hdr, 1, packet_log); fflush (packet_log); } void log_packet_restart (char *newname) { struct stat st; if (packet_log) { log_print ("log_packet_restart: capture already active on file \"%s\"", pcaplog_file); return; } if (newname) { if (stat (newname, &st) == 0) log_print ("log_packet_restart: won't overwrite existing \"%s\"", newname); else log_packet_init (newname); } else if (!pcaplog_file) log_packet_init (PCAP_FILE_DEFAULT); else if (stat (pcaplog_file, &st) != 0) log_packet_init (pcaplog_file); else { /* Re-activate capture on current file. */ packet_log = fopen (pcaplog_file, "a"); if (!packet_log) log_error ("log_packet_restart: fopen (\"%s\", \"a\") failed", pcaplog_file); else log_print ("log_packet_restart: capture restarted on file \"%s\"", pcaplog_file); } } void log_packet_stop (void) { /* Stop capture. */ if (packet_log) { fclose (packet_log); log_print ("log_packet_stop: stopped capture"); } packet_log = 0; } void log_packet_iov (struct sockaddr *src, struct sockaddr *dst, struct iovec *iov, int iovcnt) { struct isakmp_hdr *isakmphdr; struct packhdr hdr; struct udphdr udp; int off, datalen, hdrlen, i; struct timeval tv; for (i = 0, datalen = 0; i < iovcnt; i++) datalen += iov[i].iov_len; if (!packet_log || datalen > SNAPLEN) return; /* copy packet into buffer */ for (i = 0, off = 0; i < iovcnt; i++) { memcpy (packet_buf + off, iov[i].iov_base, iov[i].iov_len); off += iov[i].iov_len; } memset (&hdr, 0, sizeof hdr); memset (&udp, 0, sizeof udp); /* isakmp - turn off the encryption bit in the isakmp hdr */ isakmphdr = (struct isakmp_hdr *)packet_buf; isakmphdr->flags &= ~(ISAKMP_FLAGS_ENC); /* udp */ udp.uh_sport = udp.uh_dport = htons (500); datalen += sizeof udp; udp.uh_ulen = htons (datalen); /* ip */ hdr.sa_family = htonl (src->sa_family); switch (src->sa_family) { default: /* Assume IPv4. XXX Can 'default' ever happen here? */ hdr.sa_family = htonl (AF_INET); hdr.ip.ip4.ip_src.s_addr = 0x02020202; hdr.ip.ip4.ip_dst.s_addr = 0x01010101; /* The rest of the setup is common to AF_INET. */ goto setup_ip4; case AF_INET: hdr.ip.ip4.ip_src.s_addr = ((struct sockaddr_in *)src)->sin_addr.s_addr; hdr.ip.ip4.ip_dst.s_addr = ((struct sockaddr_in *)dst)->sin_addr.s_addr; setup_ip4: hdrlen = sizeof hdr.ip.ip4; hdr.ip.ip4.ip_v = 0x4; hdr.ip.ip4.ip_hl = 0x5; hdr.ip.ip4.ip_p = IPPROTO_UDP; hdr.ip.ip4.ip_len = htons (datalen + hdrlen); /* Let's use the IP ID as a "packet counter". */ i = ntohs (hdr.ip.ip4.ip_id) + 1; hdr.ip.ip4.ip_id = htons (i); /* Calculate IP header checksum. */ hdr.ip.ip4.ip_sum = in_cksum ((u_int16_t *)&hdr.ip.ip4, hdr.ip.ip4.ip_hl << 2); break; case AF_INET6: hdrlen = sizeof (hdr.ip.ip6); hdr.ip.ip6.ip6_vfc = IPV6_VERSION; hdr.ip.ip6.ip6_nxt = IPPROTO_UDP; hdr.ip.ip6.ip6_plen = udp.uh_ulen; memcpy (&hdr.ip.ip6.ip6_src, &((struct sockaddr_in6 *)src)->sin6_addr, sizeof hdr.ip.ip6.ip6_src); memcpy (&hdr.ip.ip6.ip6_dst, &((struct sockaddr_in6 *)dst)->sin6_addr, sizeof hdr.ip.ip6.ip6_dst); break; } /* Calculate UDP checksum. */ udp.uh_sum = udp_cksum (&hdr, &udp, (u_int16_t *)packet_buf); hdrlen += sizeof hdr.sa_family; /* pcap file packet header */ gettimeofday (&tv, 0); hdr.pcap.ts.tv_sec = tv.tv_sec; hdr.pcap.ts.tv_usec = tv.tv_usec; hdr.pcap.caplen = datalen + hdrlen; hdr.pcap.len = datalen + hdrlen; hdrlen += sizeof (struct pcap_pkthdr); datalen -= sizeof (struct udphdr); /* Write to pcap file. */ fwrite (&hdr, hdrlen, 1, packet_log); /* pcap + IP */ fwrite (&udp, sizeof (struct udphdr), 1, packet_log); /* UDP */ fwrite (packet_buf, datalen, 1, packet_log); /* IKE-data */ fflush (packet_log); return; } /* Copied from tcpdump/print-udp.c, mostly rewritten. */ static int udp_cksum (struct packhdr *hdr, const struct udphdr *u, u_int16_t *d) { int i, hdrlen, tlen = ntohs (u->uh_ulen) - sizeof (struct udphdr); struct ip *ip4; struct ip6_hdr *ip6; union phu { struct ip4pseudo { struct in_addr src; struct in_addr dst; u_int8_t z; u_int8_t proto; u_int16_t len; } ip4p; struct ip6pseudo { struct in6_addr src; struct in6_addr dst; u_int32_t plen; u_int16_t z0; u_int8_t z1; u_int8_t nxt; } ip6p; u_int16_t pa[20]; } phu; const u_int16_t *sp; u_int32_t sum; /* Setup pseudoheader. */ memset (phu.pa, 0, sizeof phu); switch (ntohl (hdr->sa_family)) { case AF_INET: ip4 = &hdr->ip.ip4; memcpy (&phu.ip4p.src, &ip4->ip_src, sizeof (struct in_addr)); memcpy (&phu.ip4p.dst, &ip4->ip_dst, sizeof (struct in_addr)); phu.ip4p.proto = ip4->ip_p; phu.ip4p.len = u->uh_ulen; hdrlen = sizeof phu.ip4p; break; case AF_INET6: ip6 = &hdr->ip.ip6; memcpy (&phu.ip6p.src, &ip6->ip6_src, sizeof (phu.ip6p.src)); memcpy (&phu.ip6p.dst, &ip6->ip6_dst, sizeof (phu.ip6p.dst)); phu.ip6p.plen = u->uh_ulen; phu.ip6p.nxt = ip6->ip6_nxt; hdrlen = sizeof phu.ip6p; break; default: return 0; } /* IPv6 wants a 0xFFFF checksum "on error", not 0x0. */ if (tlen < 0) return (ntohl (hdr->sa_family) == AF_INET ? 0 : 0xFFFF); sum = 0; for (i = 0; i < hdrlen; i += 2) sum += phu.pa[i/2]; sp = (u_int16_t *)u; for (i = 0; i < sizeof (struct udphdr); i += 2) sum += *sp++; sp = d; for (i = 0; i < (tlen&~1); i += 2) sum += *sp++; if (tlen & 1) sum += htons ((*(const char *)sp) << 8); while (sum > 0xffff) sum = (sum & 0xffff) + (sum >> 16); sum = ~sum & 0xffff; return sum; } /* Copied from tcpdump/print-ip.c, modified. */ static u_int16_t in_cksum (const u_int16_t *w, int len) { int nleft = len, sum = 0; u_int16_t answer; while (nleft > 1) { sum += *w++; nleft -= 2; } if (nleft == 1) sum += htons (*(u_char *)w << 8); sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ sum += (sum >> 16); /* add carry */ answer = ~sum; /* truncate to 16 bits */ return answer; } #endif /* USE_DEBUG */