/* $NetBSD: cgdconfig.c,v 1.27 2008/07/24 19:07:36 christos Exp $ */ /*- * Copyright (c) 2002, 2003 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Roland C. Dowdeswell. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ #include #ifndef lint __COPYRIGHT("@(#) Copyright (c) 2002, 2003\ The NetBSD Foundation, Inc. All rights reserved."); __RCSID("$NetBSD: cgdconfig.c,v 1.27 2008/07/24 19:07:36 christos Exp $"); #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "params.h" #include "pkcs5_pbkdf2.h" #include "utils.h" #define CGDCONFIG_DIR "/etc/cgd" #define CGDCONFIG_CFILE CGDCONFIG_DIR "/cgd.conf" enum action { ACTION_DEFAULT, /* default -> configure */ ACTION_CONFIGURE, /* configure, with paramsfile */ ACTION_UNCONFIGURE, /* unconfigure */ ACTION_GENERATE, /* generate a paramsfile */ ACTION_GENERATE_CONVERT, /* generate a ``dup'' paramsfile */ ACTION_CONFIGALL, /* configure all from config file */ ACTION_UNCONFIGALL, /* unconfigure all from config file */ ACTION_CONFIGSTDIN /* configure, key from stdin */ }; /* if nflag is set, do not configure/unconfigure the cgd's */ int nflag = 0; /* if pflag is set to PFLAG_STDIN read from stdin rather than getpass(3) */ #define PFLAG_GETPASS 0x01 #define PFLAG_STDIN 0x02 int pflag = PFLAG_GETPASS; static int configure(int, char **, struct params *, int); static int configure_stdin(struct params *, int argc, char **); static int generate(struct params *, int, char **, const char *); static int generate_convert(struct params *, int, char **, const char *); static int unconfigure(int, char **, struct params *, int); static int do_all(const char *, int, char **, int (*)(int, char **, struct params *, int)); #define CONFIG_FLAGS_FROMALL 1 /* called from configure_all() */ #define CONFIG_FLAGS_FROMMAIN 2 /* called from main() */ static int configure_params(int, const char *, const char *, struct params *); static void eliminate_cores(void); static bits_t *getkey(const char *, struct keygen *, size_t); static bits_t *getkey_storedkey(const char *, struct keygen *, size_t); static bits_t *getkey_randomkey(const char *, struct keygen *, size_t, int); static bits_t *getkey_pkcs5_pbkdf2(const char *, struct keygen *, size_t, int); static bits_t *getkey_shell_cmd(const char *, struct keygen *, size_t); static char *maybe_getpass(char *); static int opendisk_werror(const char *, char *, size_t); static int unconfigure_fd(int); static int verify(struct params *, int); static int verify_disklabel(int); static int verify_ffs(int); static int verify_reenter(struct params *); static void usage(void); /* Verbose Framework */ unsigned verbose = 0; #define VERBOSE(x,y) if (verbose >= x) y #define VPRINTF(x,y) if (verbose >= x) (void)printf y static void usage(void) { (void)fprintf(stderr, "usage: %s [-nv] [-V vmeth] cgd dev [paramsfile]\n", getprogname()); (void)fprintf(stderr, " %s -C [-nv] [-f configfile]\n", getprogname()); (void)fprintf(stderr, " %s -U [-nv] [-f configfile]\n", getprogname()); (void)fprintf(stderr, " %s -G [-nv] [-i ivmeth] [-k kgmeth] " "[-o outfile] paramsfile\n", getprogname()); (void)fprintf(stderr, " %s -g [-nv] [-i ivmeth] [-k kgmeth] " "[-o outfile] alg [keylen]\n", getprogname()); (void)fprintf(stderr, " %s -s [-nv] [-i ivmeth] cgd dev alg " "[keylen]\n", getprogname()); (void)fprintf(stderr, " %s -u [-nv] cgd\n", getprogname()); exit(EXIT_FAILURE); } static int parse_size_t(const char *s, size_t *l) { char *endptr; long v; errno = 0; v = strtol(s, &endptr, 10); if ((v == LONG_MIN || v == LONG_MAX) && errno) return -1; if (v < INT_MIN || v > INT_MAX) { errno = ERANGE; return -1; } if (endptr == s) { errno = EINVAL; return -1; } *l = (size_t)v; return 0; } static void set_action(enum action *action, enum action value) { if (*action != ACTION_DEFAULT) usage(); *action = value; } int main(int argc, char **argv) { struct params *p; struct params *tp; struct keygen *kg; enum action action = ACTION_DEFAULT; int ch; const char *cfile = NULL; const char *outfile = NULL; setprogname(*argv); eliminate_cores(); if (mlockall(MCL_FUTURE)) err(EXIT_FAILURE, "Can't lock memory"); p = params_new(); kg = NULL; while ((ch = getopt(argc, argv, "CGUV:b:f:gi:k:no:spuv")) != -1) switch (ch) { case 'C': set_action(&action, ACTION_CONFIGALL); break; case 'G': set_action(&action, ACTION_GENERATE_CONVERT); break; case 'U': set_action(&action, ACTION_UNCONFIGALL); break; case 'V': tp = params_verify_method(string_fromcharstar(optarg)); if (!tp) usage(); p = params_combine(p, tp); break; case 'b': { size_t size; if (parse_size_t(optarg, &size) == -1) usage(); tp = params_bsize(size); if (!tp) usage(); p = params_combine(p, tp); } break; case 'f': if (cfile) usage(); cfile = estrdup(optarg); break; case 'g': set_action(&action, ACTION_GENERATE); break; case 'i': tp = params_ivmeth(string_fromcharstar(optarg)); p = params_combine(p, tp); break; case 'k': kg = keygen_method(string_fromcharstar(optarg)); if (!kg) usage(); keygen_addlist(&p->keygen, kg); break; case 'n': nflag = 1; break; case 'o': if (outfile) usage(); outfile = estrdup(optarg); break; case 'p': pflag = PFLAG_STDIN; break; case 's': set_action(&action, ACTION_CONFIGSTDIN); break; case 'u': set_action(&action, ACTION_UNCONFIGURE); break; case 'v': verbose++; break; default: usage(); /* NOTREACHED */ } argc -= optind; argv += optind; if (!outfile) outfile = ""; if (!cfile) cfile = ""; /* validate the consistency of the arguments */ switch (action) { case ACTION_DEFAULT: /* ACTION_CONFIGURE is the default */ case ACTION_CONFIGURE: return configure(argc, argv, p, CONFIG_FLAGS_FROMMAIN); case ACTION_UNCONFIGURE: return unconfigure(argc, argv, NULL, CONFIG_FLAGS_FROMMAIN); case ACTION_GENERATE: return generate(p, argc, argv, outfile); case ACTION_GENERATE_CONVERT: return generate_convert(p, argc, argv, outfile); case ACTION_CONFIGALL: return do_all(cfile, argc, argv, configure); case ACTION_UNCONFIGALL: return do_all(cfile, argc, argv, unconfigure); case ACTION_CONFIGSTDIN: return configure_stdin(p, argc, argv); default: errx(EXIT_FAILURE, "undefined action"); /* NOTREACHED */ } } static bits_t * getkey(const char *dev, struct keygen *kg, size_t len) { bits_t *ret = NULL; bits_t *tmp; VPRINTF(3, ("getkey(\"%s\", %p, %zu) called\n", dev, kg, len)); for (; kg; kg=kg->next) { switch (kg->kg_method) { case KEYGEN_STOREDKEY: tmp = getkey_storedkey(dev, kg, len); break; case KEYGEN_RANDOMKEY: tmp = getkey_randomkey(dev, kg, len, 1); break; case KEYGEN_URANDOMKEY: tmp = getkey_randomkey(dev, kg, len, 0); break; case KEYGEN_PKCS5_PBKDF2_SHA1: tmp = getkey_pkcs5_pbkdf2(dev, kg, len, 0); break; /* provide backwards compatibility for old config files */ case KEYGEN_PKCS5_PBKDF2_OLD: tmp = getkey_pkcs5_pbkdf2(dev, kg, len, 1); break; case KEYGEN_SHELL_CMD: tmp = getkey_shell_cmd(dev, kg, len); break; default: warnx("unrecognised keygen method %d in getkey()", kg->kg_method); if (ret) bits_free(ret); return NULL; } if (ret) ret = bits_xor_d(tmp, ret); else ret = tmp; } return ret; } /*ARGSUSED*/ static bits_t * getkey_storedkey(const char *target, struct keygen *kg, size_t keylen) { return bits_dup(kg->kg_key); } /*ARGSUSED*/ static bits_t * getkey_randomkey(const char *target, struct keygen *kg, size_t keylen, int hard) { return bits_getrandombits(keylen, hard); } static char * maybe_getpass(char *prompt) { char buf[1024]; char *p = buf; char *tmp; switch (pflag) { case PFLAG_GETPASS: p = getpass(prompt); break; case PFLAG_STDIN: p = fgets(buf, sizeof(buf), stdin); if (p) { tmp = strchr(p, '\n'); if (tmp) *tmp = '\0'; } break; default: errx(EXIT_FAILURE, "pflag set inappropriately?"); } if (!p) err(EXIT_FAILURE, "failed to read passphrase"); return estrdup(p); } /*ARGSUSED*/ /* * XXX take, and pass through, a compat flag that indicates whether we * provide backwards compatibility with a previous bug. The previous * behaviour is indicated by the keygen method pkcs5_pbkdf2, and a * non-zero compat flag. The new default, and correct keygen method is * called pcks5_pbkdf2/sha1. When the old method is removed, so will * be the compat argument. */ static bits_t * getkey_pkcs5_pbkdf2(const char *target, struct keygen *kg, size_t keylen, int compat) { bits_t *ret; char *passp; char buf[1024]; u_int8_t *tmp; snprintf(buf, sizeof(buf), "%s's passphrase:", target); passp = maybe_getpass(buf); if (pkcs5_pbkdf2(&tmp, BITS2BYTES(keylen), (uint8_t *)passp, strlen(passp), bits_getbuf(kg->kg_salt), BITS2BYTES(bits_len(kg->kg_salt)), kg->kg_iterations, compat)) { warnx("failed to generate PKCS#5 PBKDF2 key"); return NULL; } ret = bits_new(tmp, keylen); kg->kg_key = bits_dup(ret); memset(passp, 0, strlen(passp)); free(passp); free(tmp); return ret; } /*ARGSUSED*/ static bits_t * getkey_shell_cmd(const char *target, struct keygen *kg, size_t keylen) { FILE *f; bits_t *ret; f = popen(string_tocharstar(kg->kg_cmd), "r"); ret = bits_fget(f, keylen); pclose(f); return ret; } /*ARGSUSED*/ static int unconfigure(int argc, char **argv, struct params *inparams, int flags) { int fd; int ret; char buf[MAXPATHLEN] = ""; /* only complain about additional arguments, if called from main() */ if (flags == CONFIG_FLAGS_FROMMAIN && argc != 1) usage(); /* if called from do_all(), then ensure that 2 or 3 args exist */ if (flags == CONFIG_FLAGS_FROMALL && (argc < 2 || argc > 3)) return -1; fd = opendisk(*argv, O_RDWR, buf, sizeof(buf), 1); if (fd == -1) { int saved_errno = errno; warn("can't open cgd \"%s\", \"%s\"", *argv, buf); /* this isn't fatal with nflag != 0 */ if (!nflag) return saved_errno; } VPRINTF(1, ("%s (%s): clearing\n", *argv, buf)); if (nflag) return 0; ret = unconfigure_fd(fd); (void)close(fd); return ret; } static int unconfigure_fd(int fd) { struct cgd_ioctl ci; if (ioctl(fd, CGDIOCCLR, &ci) == -1) { warn("ioctl"); return -1; } return 0; } /*ARGSUSED*/ static int configure(int argc, char **argv, struct params *inparams, int flags) { struct params *p; struct keygen *kg; int fd; int loop = 0; int ret; char cgdname[PATH_MAX]; if (argc == 2) { char *pfile; if (asprintf(&pfile, "%s/%s", CGDCONFIG_DIR, basename(argv[1])) == -1) return -1; p = params_cget(pfile); free(pfile); } else if (argc == 3) { p = params_cget(argv[2]); } else { /* print usage and exit, only if called from main() */ if (flags == CONFIG_FLAGS_FROMMAIN) { warnx("wrong number of args"); usage(); } return -1; } if (!p) return -1; /* * over-ride with command line specifications and fill in default * values. */ p = params_combine(p, inparams); ret = params_filldefaults(p); if (ret) { params_free(p); return ret; } if (!params_verify(p)) { warnx("params invalid"); return -1; } /* * loop over configuring the disk and checking to see if it * verifies properly. We open and close the disk device each * time, because if the user passes us the block device we * need to flush the buffer cache. * * We only loop if one of the verification methods prompts for * a password. */ for (kg = p->keygen; pflag == PFLAG_GETPASS && kg; kg = kg->next) if ((kg->kg_method == KEYGEN_PKCS5_PBKDF2_SHA1) || (kg->kg_method == KEYGEN_PKCS5_PBKDF2_OLD )) { loop = 1; break; } for (;;) { fd = opendisk_werror(argv[0], cgdname, sizeof(cgdname)); if (fd == -1) return -1; if (p->key) bits_free(p->key); p->key = getkey(argv[1], p->keygen, p->keylen); if (!p->key) goto bail_err; ret = configure_params(fd, cgdname, argv[1], p); if (ret) goto bail_err; ret = verify(p, fd); if (ret == -1) goto bail_err; if (!ret) break; (void)unconfigure_fd(fd); (void)close(fd); if (!loop) { warnx("verification failed permanently"); goto bail_err; } warnx("verification failed, please reenter passphrase"); } params_free(p); (void)close(fd); return 0; bail_err: params_free(p); (void)close(fd); return -1; } static int configure_stdin(struct params *p, int argc, char **argv) { int fd; int ret; char cgdname[PATH_MAX]; if (argc < 3 || argc > 4) usage(); p->algorithm = string_fromcharstar(argv[2]); if (argc > 3) { size_t keylen; if (parse_size_t(argv[3], &keylen) == -1) { warn("failed to parse key length"); return -1; } p->keylen = keylen; } ret = params_filldefaults(p); if (ret) return ret; fd = opendisk_werror(argv[0], cgdname, sizeof(cgdname)); if (fd == -1) return -1; p->key = bits_fget(stdin, p->keylen); if (!p->key) { warnx("failed to read key from stdin"); return -1; } return configure_params(fd, cgdname, argv[1], p); } static int opendisk_werror(const char *cgd, char *buf, size_t buflen) { int fd; VPRINTF(3, ("opendisk_werror(%s, %s, %zu) called.\n", cgd, buf, buflen)); /* sanity */ if (!cgd || !buf) return -1; if (nflag) { if (strlcpy(buf, cgd, buflen) >= buflen) return -1; return 0; } fd = opendisk(cgd, O_RDWR, buf, buflen, 0); if (fd == -1) warnx("can't open cgd \"%s\", \"%s\"", cgd, buf); return fd; } static int configure_params(int fd, const char *cgd, const char *dev, struct params *p) { struct cgd_ioctl ci; /* sanity */ if (!cgd || !dev) return -1; (void)memset(&ci, 0x0, sizeof(ci)); ci.ci_disk = dev; ci.ci_alg = string_tocharstar(p->algorithm); ci.ci_ivmethod = string_tocharstar(p->ivmeth); ci.ci_key = bits_getbuf(p->key); ci.ci_keylen = p->keylen; ci.ci_blocksize = p->bsize; VPRINTF(1, (" with alg %s keylen %zu blocksize %zu ivmethod %s\n", string_tocharstar(p->algorithm), p->keylen, p->bsize, string_tocharstar(p->ivmeth))); VPRINTF(2, ("key: ")); VERBOSE(2, bits_fprint(stdout, p->key)); VPRINTF(2, ("\n")); if (nflag) return 0; if (ioctl(fd, CGDIOCSET, &ci) == -1) { int saved_errno = errno; warn("ioctl"); return saved_errno; } return 0; } /* * verify returns 0 for success, -1 for unrecoverable error, or 1 for retry. */ #define SCANSIZE 8192 static int verify(struct params *p, int fd) { switch (p->verify_method) { case VERIFY_NONE: return 0; case VERIFY_DISKLABEL: return verify_disklabel(fd); case VERIFY_FFS: return verify_ffs(fd); case VERIFY_REENTER: return verify_reenter(p); default: warnx("unimplemented verification method"); return -1; } } static int verify_disklabel(int fd) { struct disklabel l; ssize_t ret; char buf[SCANSIZE]; /* * we simply scan the first few blocks for a disklabel, ignoring * any MBR/filecore sorts of logic. MSDOS and RiscOS can't read * a cgd, anyway, so it is unlikely that there will be non-native * partition information. */ ret = pread(fd, buf, 8192, 0); if (ret < 0) { warn("can't read disklabel area"); return -1; } /* now scan for the disklabel */ return disklabel_scan(&l, buf, (size_t)ret); } static off_t sblock_try[] = SBLOCKSEARCH; static int verify_ffs(int fd) { size_t i; for (i = 0; sblock_try[i] != -1; i++) { union { char buf[SBLOCKSIZE]; struct fs fs; } u; ssize_t ret; ret = pread(fd, &u, sizeof(u), sblock_try[i]); if (ret < 0) { warn("pread"); break; } else if ((size_t)ret < sizeof(u)) { warnx("pread: incomplete block"); break; } switch (u.fs.fs_magic) { case FS_UFS1_MAGIC: case FS_UFS2_MAGIC: case FS_UFS1_MAGIC_SWAPPED: case FS_UFS2_MAGIC_SWAPPED: return 0; default: continue; } } return 1; /* failure */ } static int verify_reenter(struct params *p) { struct keygen *kg; bits_t *orig_key, *key; int ret; ret = 0; for (kg = p->keygen; kg && !ret; kg = kg->next) { if ((kg->kg_method != KEYGEN_PKCS5_PBKDF2_SHA1) && (kg->kg_method != KEYGEN_PKCS5_PBKDF2_OLD )) continue; orig_key = kg->kg_key; kg->kg_key = NULL; /* add a compat flag till the _OLD method goes away */ key = getkey_pkcs5_pbkdf2("re-enter device", kg, bits_len(orig_key), kg->kg_method == KEYGEN_PKCS5_PBKDF2_OLD); ret = !bits_match(key, orig_key); bits_free(key); bits_free(kg->kg_key); kg->kg_key = orig_key; } return ret; } static int generate(struct params *p, int argc, char **argv, const char *outfile) { int ret; if (argc < 1 || argc > 2) usage(); p->algorithm = string_fromcharstar(argv[0]); if (argc > 1) { size_t keylen; if (parse_size_t(argv[1], &keylen) == -1) { warn("Failed to parse key length"); return -1; } p->keylen = keylen; } ret = params_filldefaults(p); if (ret) return ret; if (!p->keygen) { p->keygen = keygen_generate(KEYGEN_PKCS5_PBKDF2_SHA1); if (!p->keygen) return -1; } if (keygen_filldefaults(p->keygen, p->keylen)) { warnx("Failed to generate defaults for keygen"); return -1; } if (!params_verify(p)) { warnx("invalid parameters generated"); return -1; } return params_cput(p, outfile); } static int generate_convert(struct params *p, int argc, char **argv, const char *outfile) { struct params *oldp; struct keygen *kg; if (argc != 1) usage(); oldp = params_cget(*argv); if (!oldp) return -1; /* for sanity, we ensure that none of the keygens are randomkey */ for (kg=p->keygen; kg; kg=kg->next) if (kg->kg_method == KEYGEN_RANDOMKEY) goto bail; for (kg=oldp->keygen; kg; kg=kg->next) if (kg->kg_method == KEYGEN_RANDOMKEY) goto bail; if (!params_verify(oldp)) { warnx("invalid old parameters file \"%s\"", *argv); return -1; } oldp->key = getkey("old file", oldp->keygen, oldp->keylen); /* we copy across the non-keygen info, here. */ string_free(p->algorithm); string_free(p->ivmeth); p->algorithm = string_dup(oldp->algorithm); p->ivmeth = string_dup(oldp->ivmeth); p->keylen = oldp->keylen; p->bsize = oldp->bsize; if (p->verify_method == VERIFY_UNKNOWN) p->verify_method = oldp->verify_method; params_free(oldp); if (!p->keygen) { p->keygen = keygen_generate(KEYGEN_PKCS5_PBKDF2_SHA1); if (!p->keygen) return -1; } (void)params_filldefaults(p); (void)keygen_filldefaults(p->keygen, p->keylen); p->key = getkey("new file", p->keygen, p->keylen); kg = keygen_generate(KEYGEN_STOREDKEY); kg->kg_key = bits_xor(p->key, oldp->key); keygen_addlist(&p->keygen, kg); if (!params_verify(p)) { warnx("can't generate new parameters file"); return -1; } return params_cput(p, outfile); bail: params_free(oldp); return -1; } static int /*ARGSUSED*/ do_all(const char *cfile, int argc, char **argv, int (*conf)(int, char **, struct params *, int)) { FILE *f; size_t len; size_t lineno; int my_argc; int ret; const char *fn; char *line; char **my_argv; if (argc > 0) usage(); if (!cfile[0]) fn = CGDCONFIG_CFILE; else fn = cfile; f = fopen(fn, "r"); if (!f) { warn("could not open config file \"%s\"", fn); return -1; } ret = chdir(CGDCONFIG_DIR); if (ret == -1) warn("could not chdir to %s", CGDCONFIG_DIR); ret = 0; lineno = 0; for (;;) { line = fparseln(f, &len, &lineno, "\\\\#", FPARSELN_UNESCALL); if (!line) break; if (!*line) continue; my_argv = words(line, &my_argc); ret = conf(my_argc, my_argv, NULL, CONFIG_FLAGS_FROMALL); if (ret) { warnx("action failed on \"%s\" line %lu", fn, (u_long)lineno); break; } words_free(my_argv, my_argc); } return ret; } static void eliminate_cores(void) { struct rlimit rlp; rlp.rlim_cur = 0; rlp.rlim_max = 0; if (setrlimit(RLIMIT_CORE, &rlp) == -1) err(EXIT_FAILURE, "Can't disable cores"); }