Index: head/sbin/dumpon/dumpon.c =================================================================== --- head/sbin/dumpon/dumpon.c (revision 358593) +++ head/sbin/dumpon/dumpon.c (revision 358594) @@ -1,586 +1,583 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1980, 1993 * The Regents of the University of California. 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. Neither the name of the University 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 REGENTS 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 REGENTS 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. */ #if 0 #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1980, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static char sccsid[] = "From: @(#)swapon.c 8.1 (Berkeley) 6/5/93"; #endif /* not lint */ #endif #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_CRYPTO #include #include #include #endif static int verbose; static void _Noreturn usage(void) { fprintf(stderr, "usage: dumpon [-i index] [-r] [-v] [-k ] [-Zz] \n" " dumpon [-i index] [-r] [-v] [-k ] [-Zz]\n" " [-g ] -s -c \n" " dumpon [-v] off\n" " dumpon [-v] -l\n"); exit(EX_USAGE); } /* * Look for a default route on the specified interface. */ static char * find_gateway(const char *ifname) { struct ifaddrs *ifa, *ifap; struct rt_msghdr *rtm; struct sockaddr *sa; struct sockaddr_dl *sdl; struct sockaddr_in *dst, *mask, *gw; char *buf, *next, *ret; size_t sz; int error, i, ifindex, mib[7]; /* First look up the interface index. */ if (getifaddrs(&ifap) != 0) err(EX_OSERR, "getifaddrs"); for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { if (ifa->ifa_addr->sa_family != AF_LINK) continue; if (strcmp(ifa->ifa_name, ifname) == 0) { sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr; ifindex = sdl->sdl_index; break; } } if (ifa == NULL) errx(1, "couldn't find interface index for '%s'", ifname); freeifaddrs(ifap); /* Now get the IPv4 routing table. */ mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = AF_INET; mib[4] = NET_RT_DUMP; mib[5] = 0; mib[6] = -1; /* FIB */ for (;;) { if (sysctl(mib, nitems(mib), NULL, &sz, NULL, 0) != 0) err(EX_OSERR, "sysctl(NET_RT_DUMP)"); buf = malloc(sz); error = sysctl(mib, nitems(mib), buf, &sz, NULL, 0); if (error == 0) break; if (errno != ENOMEM) err(EX_OSERR, "sysctl(NET_RT_DUMP)"); free(buf); } ret = NULL; for (next = buf; next < buf + sz; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)(void *)next; if (rtm->rtm_version != RTM_VERSION) continue; if ((rtm->rtm_flags & RTF_GATEWAY) == 0 || rtm->rtm_index != ifindex) continue; dst = gw = mask = NULL; sa = (struct sockaddr *)(rtm + 1); for (i = 0; i < RTAX_MAX; i++) { if ((rtm->rtm_addrs & (1 << i)) != 0) { switch (i) { case RTAX_DST: dst = (void *)sa; break; case RTAX_GATEWAY: gw = (void *)sa; break; case RTAX_NETMASK: mask = (void *)sa; break; } } sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa)); } if (dst->sin_addr.s_addr == INADDR_ANY && mask->sin_addr.s_addr == 0) { ret = inet_ntoa(gw->sin_addr); break; } } free(buf); return (ret); } static void check_size(int fd, const char *fn) { int name[] = { CTL_HW, HW_PHYSMEM }; size_t namelen = nitems(name); unsigned long physmem; size_t len; off_t mediasize; int minidump; len = sizeof(minidump); if (sysctlbyname("debug.minidump", &minidump, &len, NULL, 0) == 0 && minidump == 1) return; len = sizeof(physmem); if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0) err(EX_OSERR, "can't get memory size"); if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0) err(EX_OSERR, "%s: can't get size", fn); - if ((uintmax_t)mediasize < (uintmax_t)physmem) { - if (verbose) - printf("%s is smaller than physical memory\n", fn); - exit(EX_IOERR); - } + if ((uintmax_t)mediasize < (uintmax_t)physmem) + errx(EX_IOERR, "%s is smaller than physical memory", fn); } #ifdef HAVE_CRYPTO static void genkey(const char *pubkeyfile, struct diocskerneldump_arg *kdap) { FILE *fp; RSA *pubkey; assert(pubkeyfile != NULL); assert(kdap != NULL); fp = NULL; pubkey = NULL; fp = fopen(pubkeyfile, "r"); if (fp == NULL) err(1, "Unable to open %s", pubkeyfile); if (caph_enter() < 0) err(1, "Unable to enter capability mode"); pubkey = RSA_new(); if (pubkey == NULL) { errx(1, "Unable to allocate an RSA structure: %s", ERR_error_string(ERR_get_error(), NULL)); } pubkey = PEM_read_RSA_PUBKEY(fp, &pubkey, NULL, NULL); fclose(fp); fp = NULL; if (pubkey == NULL) errx(1, "Unable to read data from %s.", pubkeyfile); /* * RSA keys under ~1024 bits are trivially factorable (2018). OpenSSL * provides an API for RSA keys to estimate the symmetric-cipher * "equivalent" bits of security (defined in NIST SP800-57), which as * of this writing equates a 2048-bit RSA key to 112 symmetric cipher * bits. * * Use this API as a seatbelt to avoid suggesting to users that their * privacy is protected by encryption when the key size is insufficient * to prevent compromise via factoring. * * Future work: Sanity check for weak 'e', and sanity check for absence * of 'd' (i.e., the supplied key is a public key rather than a full * keypair). */ #if OPENSSL_VERSION_NUMBER >= 0x10100000L if (RSA_security_bits(pubkey) < 112) #else if (RSA_size(pubkey) * 8 < 2048) #endif errx(1, "Small RSA keys (you provided: %db) can be " "factored cheaply. Please generate a larger key.", RSA_size(pubkey) * 8); kdap->kda_encryptedkeysize = RSA_size(pubkey); if (kdap->kda_encryptedkeysize > KERNELDUMP_ENCKEY_MAX_SIZE) { errx(1, "Public key has to be at most %db long.", 8 * KERNELDUMP_ENCKEY_MAX_SIZE); } kdap->kda_encryptedkey = calloc(1, kdap->kda_encryptedkeysize); if (kdap->kda_encryptedkey == NULL) err(1, "Unable to allocate encrypted key"); /* * If no cipher was specified, choose a reasonable default. */ if (kdap->kda_encryption == KERNELDUMP_ENC_NONE) kdap->kda_encryption = KERNELDUMP_ENC_CHACHA20; else if (kdap->kda_encryption == KERNELDUMP_ENC_AES_256_CBC && kdap->kda_compression != KERNELDUMP_COMP_NONE) errx(EX_USAGE, "Unpadded AES256-CBC mode cannot be used " "with compression."); arc4random_buf(kdap->kda_key, sizeof(kdap->kda_key)); if (RSA_public_encrypt(sizeof(kdap->kda_key), kdap->kda_key, kdap->kda_encryptedkey, pubkey, RSA_PKCS1_PADDING) != (int)kdap->kda_encryptedkeysize) { errx(1, "Unable to encrypt the one-time key."); } RSA_free(pubkey); } #endif static void listdumpdev(void) { static char ip[200]; char dumpdev[PATH_MAX]; struct diocskerneldump_arg ndconf; size_t len; const char *sysctlname = "kern.shutdown.dumpdevname"; int fd; len = sizeof(dumpdev); if (sysctlbyname(sysctlname, &dumpdev, &len, NULL, 0) != 0) { if (errno == ENOMEM) { err(EX_OSERR, "Kernel returned too large of a buffer for '%s'\n", sysctlname); } else { err(EX_OSERR, "Sysctl get '%s'\n", sysctlname); } } if (strlen(dumpdev) == 0) (void)strlcpy(dumpdev, _PATH_DEVNULL, sizeof(dumpdev)); if (verbose) { char *ctx, *dd; unsigned idx; printf("kernel dumps on priority: device\n"); idx = 0; ctx = dumpdev; while ((dd = strsep(&ctx, ",")) != NULL) printf("%u: %s\n", idx++, dd); } else printf("%s\n", dumpdev); /* If netdump is enabled, print the configuration parameters. */ if (verbose) { fd = open(_PATH_NETDUMP, O_RDONLY); if (fd < 0) { if (errno != ENOENT) err(EX_OSERR, "opening %s", _PATH_NETDUMP); return; } if (ioctl(fd, DIOCGKERNELDUMP, &ndconf) != 0) { if (errno != ENXIO) err(EX_OSERR, "ioctl(DIOCGKERNELDUMP)"); (void)close(fd); return; } printf("server address: %s\n", inet_ntop(ndconf.kda_af, &ndconf.kda_server, ip, sizeof(ip))); printf("client address: %s\n", inet_ntop(ndconf.kda_af, &ndconf.kda_client, ip, sizeof(ip))); printf("gateway address: %s\n", inet_ntop(ndconf.kda_af, &ndconf.kda_gateway, ip, sizeof(ip))); (void)close(fd); } } static int opendumpdev(const char *arg, char *dumpdev) { int fd, i; if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) strlcpy(dumpdev, arg, PATH_MAX); else { i = snprintf(dumpdev, PATH_MAX, "%s%s", _PATH_DEV, arg); if (i < 0) err(EX_OSERR, "%s", arg); if (i >= PATH_MAX) errc(EX_DATAERR, EINVAL, "%s", arg); } fd = open(dumpdev, O_RDONLY); if (fd < 0) err(EX_OSFILE, "%s", dumpdev); return (fd); } int main(int argc, char *argv[]) { char dumpdev[PATH_MAX]; struct diocskerneldump_arg ndconf, *kdap; struct addrinfo hints, *res; const char *dev, *pubkeyfile, *server, *client, *gateway; int ch, error, fd, cipher; bool gzip, list, netdump, zstd, insert, rflag; uint8_t ins_idx; gzip = list = netdump = zstd = insert = rflag = false; kdap = NULL; pubkeyfile = NULL; server = client = gateway = NULL; ins_idx = KDA_APPEND; cipher = KERNELDUMP_ENC_NONE; while ((ch = getopt(argc, argv, "C:c:g:i:k:lrs:vZz")) != -1) switch ((char)ch) { case 'C': if (strcasecmp(optarg, "chacha") == 0 || strcasecmp(optarg, "chacha20") == 0) cipher = KERNELDUMP_ENC_CHACHA20; else if (strcasecmp(optarg, "aes-cbc") == 0 || strcasecmp(optarg, "aes256-cbc") == 0) cipher = KERNELDUMP_ENC_AES_256_CBC; else errx(EX_USAGE, "Unrecognized cipher algorithm " "'%s'", optarg); break; case 'c': client = optarg; break; case 'g': gateway = optarg; break; case 'i': { int i; i = atoi(optarg); if (i < 0 || i >= KDA_APPEND - 1) errx(EX_USAGE, "-i index must be between zero and %d.", (int)KDA_APPEND - 2); insert = true; ins_idx = i; } break; case 'k': pubkeyfile = optarg; break; case 'l': list = true; break; case 'r': rflag = true; break; case 's': server = optarg; break; case 'v': verbose = 1; break; case 'Z': zstd = true; break; case 'z': gzip = true; break; default: usage(); } if (gzip && zstd) errx(EX_USAGE, "The -z and -Z options are mutually exclusive."); if (insert && rflag) errx(EX_USAGE, "The -i and -r options are mutually exclusive."); argc -= optind; argv += optind; if (list) { listdumpdev(); exit(EX_OK); } if (argc != 1) usage(); #ifdef HAVE_CRYPTO if (cipher != KERNELDUMP_ENC_NONE && pubkeyfile == NULL) errx(EX_USAGE, "-C option requires a public key file."); #else if (pubkeyfile != NULL) errx(EX_UNAVAILABLE,"Unable to use the public key." " Recompile dumpon with OpenSSL support."); #endif if (server != NULL && client != NULL) { dev = _PATH_NETDUMP; netdump = true; } else if (server == NULL && client == NULL && argc > 0) { if (strcmp(argv[0], "off") == 0) { rflag = true; dev = _PATH_DEVNULL; } else dev = argv[0]; netdump = false; } else usage(); fd = opendumpdev(dev, dumpdev); - if (!netdump && !gzip && !rflag) + if (!netdump && !gzip && !zstd && !rflag) check_size(fd, dumpdev); kdap = &ndconf; bzero(kdap, sizeof(*kdap)); if (rflag) kdap->kda_index = KDA_REMOVE; else kdap->kda_index = ins_idx; kdap->kda_compression = KERNELDUMP_COMP_NONE; if (zstd) kdap->kda_compression = KERNELDUMP_COMP_ZSTD; else if (gzip) kdap->kda_compression = KERNELDUMP_COMP_GZIP; if (netdump) { memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_INET; hints.ai_protocol = IPPROTO_UDP; res = NULL; error = getaddrinfo(server, NULL, &hints, &res); if (error != 0) err(1, "%s", gai_strerror(error)); if (res == NULL) errx(1, "failed to resolve '%s'", server); server = inet_ntoa( ((struct sockaddr_in *)(void *)res->ai_addr)->sin_addr); freeaddrinfo(res); if (strlcpy(ndconf.kda_iface, argv[0], sizeof(ndconf.kda_iface)) >= sizeof(ndconf.kda_iface)) errx(EX_USAGE, "invalid interface name '%s'", argv[0]); if (inet_aton(server, &ndconf.kda_server.in4) == 0) errx(EX_USAGE, "invalid server address '%s'", server); if (inet_aton(client, &ndconf.kda_client.in4) == 0) errx(EX_USAGE, "invalid client address '%s'", client); if (gateway == NULL) { gateway = find_gateway(argv[0]); if (gateway == NULL) { if (verbose) printf( "failed to look up gateway for %s\n", server); gateway = server; } } if (inet_aton(gateway, &ndconf.kda_gateway.in4) == 0) errx(EX_USAGE, "invalid gateway address '%s'", gateway); ndconf.kda_af = AF_INET; } #ifdef HAVE_CRYPTO if (pubkeyfile != NULL) { kdap->kda_encryption = cipher; genkey(pubkeyfile, kdap); } #endif error = ioctl(fd, DIOCSKERNELDUMP, kdap); if (error != 0) error = errno; explicit_bzero(kdap->kda_encryptedkey, kdap->kda_encryptedkeysize); free(kdap->kda_encryptedkey); explicit_bzero(kdap, sizeof(*kdap)); if (error != 0) { if (netdump) { /* * Be slightly less user-hostile for some common * errors, especially as users don't have any great * discoverability into which NICs support netdump. */ if (error == ENXIO) errx(EX_OSERR, "Unable to configure netdump " "because the interface's link is down."); else if (error == ENODEV) errx(EX_OSERR, "Unable to configure netdump " "because the interface driver does not yet " "support netdump."); } errc(EX_OSERR, error, "ioctl(DIOCSKERNELDUMP)"); } if (verbose) listdumpdev(); exit(EX_OK); }