--- /dev/null
+/* -*-c-*-
+ *
+ * Verify signatures on distribuitions of files
+ *
+ * (c) 2000 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include "config.h"
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <mLib/alloc.h>
+#include <mLib/base64.h>
+#include <mLib/mdwopt.h>
+#include <mLib/quis.h>
+#include <mLib/report.h>
+#include <mLib/sub.h>
+
+#include "getdate.h"
+#include "rand.h"
+#include "ghash.h"
+#include "key.h"
+#include "key-data.h"
+#include "noise.h"
+#include "cc.h"
+
+/*----- Data formatting ---------------------------------------------------*/
+
+/* --- Binary data structure --- *
+ *
+ * The binary format, which is used for hashing and for the optional binary
+ * output, consists of a sequence of tagged blocks. The tag describes the
+ * format and meaining of the following data.
+ */
+
+enum {
+ /* --- Block tags --- */
+
+ T_IDENT = 0, /* An identifying marker */
+ T_KEYID, /* Key identifier */
+ T_BEGIN, /* Begin hashing here */
+ T_COMMENT = T_BEGIN, /* A textual comment */
+ T_DATE, /* Creation date of signature */
+ T_EXPIRE, /* Expiry date of signature */
+ T_FILE, /* File and corresponding hash */
+ T_SIGNATURE, /* Final signature block */
+
+ /* --- Error messages --- */
+
+ E_EOF = -1,
+ E_BIN = -2,
+ E_TAG = -3,
+ E_DATE = -4
+};
+
+/* --- Name translation table --- */
+
+static const char *tagtab[] = {
+ "ident:", "keyid:",
+ "comment:", "date:", "expires:", "file:",
+ "signature:",
+ 0
+};
+
+static const char *errtab[] = {
+ "Off-by-one bug",
+ "Unexpected end-of-file",
+ "Binary object too large",
+ "Unrecognized tag",
+ "Bad date string"
+};
+
+/* --- Memory representation of block types --- */
+
+typedef struct block {
+ int tag; /* Type tag */
+ dstr d; /* String data */
+ dstr b; /* Binary data */
+ time_t t; /* Timestamp */
+ uint32 k; /* Keyid */
+} block;
+
+/* --- @timestring@ --- *
+ *
+ * Arguments: @time_t t@ = a timestamp
+ * @dstr *d@ = a string to write on
+ *
+ * Returns: ---
+ *
+ * Use: Writes a textual representation of the timestamp to the
+ * string.
+ */
+
+static void timestring(time_t t, dstr *d)
+{
+ if (t == KEXP_FOREVER)
+ DPUTS(d, "forever");
+ else {
+ struct tm *tm = localtime(&t);
+ DENSURE(d, 32);
+ d->len += strftime(d->buf + d->len, 32, "%Y-%m-%d %H:%M:%S %Z", tm);
+ DPUTZ(d);
+ }
+}
+
+/* --- @breset@ --- *
+ *
+ * Arguments: @block *b@ = block to reset
+ *
+ * Returns: ---
+ *
+ * Use: Resets a block so that more stuff can be put in it.
+ */
+
+static void breset(block *b)
+{
+ b->tag = 0;
+ DRESET(&b->d);
+ DRESET(&b->b);
+ b->k = 0;
+ b->t = KEXP_EXPIRE;
+}
+
+/* --- @binit@ --- *
+ *
+ * Arguments: @block *b@ = block to initialize
+ *
+ * Returns: ---
+ *
+ * Use: Initializes a block as something to read into.
+ */
+
+static void binit(block *b)
+{
+ dstr_create(&b->d);
+ dstr_create(&b->b);
+ breset(b);
+}
+
+/* --- @bdestroy@ --- *
+ *
+ * Arguments: @block *b@ = block to destroy
+ *
+ * Returns: ---
+ *
+ * Use: Destroys a block's contents.
+ */
+
+static void bdestroy(block *b)
+{
+ dstr_destroy(&b->d);
+ dstr_destroy(&b->b);
+}
+
+/* --- @bget@ --- *
+ *
+ * Arguments: @block *b@ = pointer to block
+ * @FILE *fp@ = stream to read from
+ * @unsigned bin@ = binary switch
+ *
+ * Returns: Tag of block, or an error tag.
+ *
+ * Use: Reads a block from a stream.
+ */
+
+static int bget(block *b, FILE *fp, unsigned bin)
+{
+ int tag;
+
+ /* --- Read the tag --- */
+
+ if (bin)
+ tag = getc(fp);
+ else {
+ dstr d = DSTR_INIT;
+ if (getstring(fp, &d, GSF_FILE))
+ return (E_EOF);
+ for (tag = 0; tagtab[tag]; tag++) {
+ if (strcmp(tagtab[tag], d.buf) == 0)
+ goto done;
+ }
+ return (E_TAG);
+ done:;
+ }
+
+ /* --- Decide what to do next --- */
+
+ breset(b);
+ b->tag = tag;
+ switch (tag) {
+
+ /* --- Reading of strings --- */
+
+ case T_IDENT:
+ case T_COMMENT:
+ if (getstring(fp, &b->d, GSF_FILE | (bin ? GSF_RAW : 0)))
+ return (E_EOF);
+ break;
+
+ /* --- Timestamps --- */
+
+ case T_DATE:
+ case T_EXPIRE:
+ if (bin) {
+ octet buf[8];
+ if (fread(buf, sizeof(buf), 1, fp) < 1)
+ return (E_EOF);
+ b->t = ((time_t)(((LOAD32(buf + 0) << 16) << 16) & ~MASK32) |
+ (time_t)LOAD32(buf + 4));
+ } else {
+ if (getstring(fp, &b->d, GSF_FILE))
+ return (E_EOF);
+ if (strcmp(b->d.buf, "forever") == 0)
+ b->t = KEXP_FOREVER;
+ else if ((b->t = get_date(b->d.buf, 0)) == -1)
+ return (E_DATE);
+ }
+ break;
+
+ /* --- Key ids --- */
+
+ case T_KEYID:
+ if (bin) {
+ octet buf[4];
+ if (fread(buf, sizeof(buf), 1, fp) < 1)
+ return (E_EOF);
+ b->k = LOAD32(buf);
+ } else {
+ if (getstring(fp, &b->d, GSF_FILE))
+ return (E_EOF);
+ b->k = strtoul(b->d.buf, 0, 16);
+ }
+ break;
+
+ /* --- Reading of binary data --- */
+
+ case T_FILE:
+ case T_SIGNATURE:
+ if (bin) {
+ octet buf[2];
+ uint32 sz;
+ if (fread(buf, sizeof(buf), 1, fp) < 1)
+ return (E_EOF);
+ sz = LOAD16(buf);
+ if (sz > 4096)
+ return (E_BIN);
+ DENSURE(&b->b, sz);
+ if (fread(b->b.buf + b->b.len, 1, sz, fp) < sz)
+ return (E_EOF);
+ b->b.len += sz;
+ } else {
+ base64_ctx b64;
+ if (getstring(fp, &b->d, GSF_FILE))
+ return (E_EOF);
+ base64_init(&b64);
+ base64_decode(&b64, b->d.buf, b->d.len, &b->b);
+ base64_decode(&b64, 0, 0, &b->b);
+ DRESET(&b->d);
+ }
+ if (tag == T_FILE &&
+ getstring(fp, &b->d, GSF_FILE | (bin ? GSF_RAW : 0)))
+ return (E_EOF);
+ break;
+
+ /* --- Anything else --- */
+
+ default:
+ return (E_TAG);
+ }
+
+ return (tag);
+}
+
+/* --- @blob@ --- *
+ *
+ * Arguments: @block *b@ = pointer to block to emit
+ * @dstr *d@ = output buffer
+ *
+ * Returns: ---
+ *
+ * Use: Encodes a block in a binary format.
+ */
+
+static void blob(block *b, dstr *d)
+{
+ DPUTC(d, b->tag);
+ switch (b->tag) {
+ case T_IDENT:
+ case T_COMMENT:
+ DPUTD(d, &b->d);
+ DPUTC(d, 0);
+ break;
+ case T_DATE:
+ case T_EXPIRE:
+ DENSURE(d, 8);
+ if (b->t == KEXP_FOREVER) {
+ STORE32(d->buf + d->len, 0xffffffff);
+ STORE32(d->buf + d->len + 4, 0xffffffff);
+ } else {
+ STORE32(d->buf + d->len, ((b->t & ~MASK32) >> 16) >> 16);
+ STORE32(d->buf + d->len + 4, b->t);
+ }
+ d->len += 8;
+ break;
+ case T_KEYID:
+ DENSURE(d, 4);
+ STORE32(d->buf + d->len, b->k);
+ d->len += 4;
+ break;
+ case T_FILE:
+ case T_SIGNATURE:
+ DENSURE(d, 2);
+ STORE16(d->buf + d->len, b->b.len);
+ d->len += 2;
+ DPUTD(d, &b->b);
+ if (b->tag == T_FILE) {
+ DPUTD(d, &b->d);
+ DPUTC(d, 0);
+ }
+ break;
+ }
+}
+
+/* --- @bwrite@ --- *
+ *
+ * Arguments: @block *b@ = pointer to block to write
+ * @FILE *fp@ = stream to write on
+ *
+ * Returns: ---
+ *
+ * Use: Writes a block on a stream in a textual format.
+ */
+
+static void bwrite(block *b, FILE *fp)
+{
+ fputs(tagtab[b->tag], fp);
+ putc(' ', fp);
+ switch (b->tag) {
+ case T_IDENT:
+ case T_COMMENT:
+ putstring(fp, b->d.buf, 0);
+ break;
+ case T_DATE:
+ case T_EXPIRE: {
+ dstr d = DSTR_INIT;
+ timestring(b->t, &d);
+ putstring(fp, d.buf, 0);
+ dstr_destroy(&d);
+ } break;
+ case T_KEYID:
+ fprintf(fp, "%08lx", (unsigned long)b->k);
+ break;
+ case T_FILE:
+ case T_SIGNATURE: {
+ dstr d = DSTR_INIT;
+ base64_ctx b64;
+ base64_init(&b64);
+ b64.maxline = 0;
+ base64_encode(&b64, b->b.buf, b->b.len, &d);
+ base64_encode(&b64, 0, 0, &d);
+ dstr_write(&d, fp);
+ if (b->tag == T_FILE) {
+ putc(' ', fp);
+ putstring(fp, b->d.buf, 0);
+ }
+ } break;
+ }
+ putc('\n', fp);
+}
+
+/* --- @bemit@ --- *
+ *
+ * Arguments: @block *b@ = pointer to block to write
+ * @FILE *fp@ = file to write on
+ * @ghash *h@ = pointer to hash function
+ * @unsigned bin@ = binary/text flag
+ *
+ * Returns: ---
+ *
+ * Use: Spits out a block properly.
+ */
+
+static void bemit(block *b, FILE *fp, ghash *h, unsigned bin)
+{
+ if (h || (fp && bin)) {
+ dstr d = DSTR_INIT;
+ blob(b, &d);
+ if (h)
+ GH_HASH(h, d.buf, d.len);
+ if (fp && bin)
+ fwrite(d.buf, d.len, 1, fp);
+ }
+ if (fp && !bin)
+ bwrite(b, fp);
+}
+
+/*----- Static variables --------------------------------------------------*/
+
+static const char *keyring = "keyring";
+
+/*----- Other shared functions --------------------------------------------*/
+
+/* --- @fhex@ --- *
+ *
+ * Arguments: @FILE *fp@ = file to write on
+ * @const void *p@ = pointer to data to be written
+ * @size_t sz@ = size of the data to write
+ *
+ * Returns: ---
+ *
+ * Use: Emits a hex dump to a stream.
+ */
+
+static void fhex(FILE *fp, const void *p, size_t sz)
+{
+ const octet *q = p;
+ if (!sz)
+ return;
+ for (;;) {
+ fprintf(fp, "%02x", *q++);
+ sz--;
+ if (!sz)
+ break;
+ }
+}
+
+/*----- Signature generation ----------------------------------------------*/
+
+static int sign(int argc, char *argv[])
+{
+#define f_bogus 1u
+#define f_bin 2u
+#define f_nocheck 4u
+
+ unsigned f = 0;
+ const char *ki = "dsig";
+ key_file kf;
+ key *k;
+ sig *s;
+ fhashstate fh;
+ time_t exp = KEXP_EXPIRE;
+ unsigned verb = 0;
+ const char *ifile = 0, *hfile = 0;
+ const char *ofile = 0;
+ const char *c = 0;
+ const char *err;
+ FILE *ifp, *ofp;
+ dstr d = DSTR_INIT;
+ hfpctx hfp;
+ block b;
+ int e, hf, n;
+
+ for (;;) {
+ static struct option opts[] = {
+ { "null", 0, 0, '0' },
+ { "binary", 0, 0, 'b' },
+ { "verbose", 0, 0, 'v' },
+ { "progress", 0, 0, 'p' },
+ { "quiet", 0, 0, 'q' },
+ { "comment", OPTF_ARGREQ, 0, 'c' },
+ { "file", OPTF_ARGREQ, 0, 'f' },
+ { "hashes", OPTF_ARGREQ, 0, 'h' },
+ { "output", OPTF_ARGREQ, 0, 'o' },
+ { "key", OPTF_ARGREQ, 0, 'k' },
+ { "expire", OPTF_ARGREQ, 0, 'e' },
+ { "nocheck", OPTF_ARGREQ, 0, 'C' },
+ { 0, 0, 0, 0 }
+ };
+ int i = mdwopt(argc, argv, "+0vpqbC" "c:" "f:h:o:" "k:e:",
+ opts, 0, 0, 0);
+ if (i < 0)
+ break;
+ switch (i) {
+ case '0':
+ f |= GSF_RAW;
+ break;
+ case 'b':
+ f |= f_bin;
+ break;
+ case 'v':
+ verb++;
+ break;
+ case 'p':
+ f |= FHF_PROGRESS;
+ break;
+ case 'q':
+ if (verb > 0)
+ verb--;
+ break;
+ case 'C':
+ f |= f_nocheck;
+ break;
+ case 'c':
+ c = optarg;
+ break;
+ case 'f':
+ ifile = optarg;
+ break;
+ case 'h':
+ hfile = optarg;
+ break;
+ case 'o':
+ ofile = optarg;
+ break;
+ case 'k':
+ ki = optarg;
+ break;
+ case 'e':
+ if (strcmp(optarg, "forever") == 0)
+ exp = KEXP_FOREVER;
+ else if ((exp = get_date(optarg, 0)) == -1)
+ die(EXIT_FAILURE, "bad expiry time");
+ break;
+ default:
+ f |= f_bogus;
+ break;
+ }
+ }
+ if (optind != argc || (f & f_bogus))
+ die(EXIT_FAILURE, "Usage: sign [-OPTIONS]");
+ if (hfile && ifile)
+ die(EXIT_FAILURE, "Inconsistent options `-h' and `-f'");
+
+ /* --- Locate the signing key --- */
+
+ if (key_open(&kf, keyring, KOPEN_WRITE, key_moan, 0))
+ die(EXIT_FAILURE, "couldn't open keyring `%s'", keyring);
+ if ((k = key_bytag(&kf, ki)) == 0)
+ die(EXIT_FAILURE, "couldn't find key `%s'", ki);
+ key_fulltag(k, &d);
+ if (exp == KEXP_FOREVER && k->exp != KEXP_FOREVER) {
+ die(EXIT_FAILURE, "key `%s' expires: can't create nonexpiring signature",
+ d.buf);
+ }
+ s = getsig(k, "dsig", 1);
+
+ /* --- Check the key --- */
+
+ if (!(f & f_nocheck) && (err = s->ops->check(s)) != 0)
+ moan("key `%s' fails check: %s", d.buf, err);
+
+ /* --- Open files --- */
+
+ if (hfile) ifile = hfile;
+ if (!ifile || strcmp(ifile, "-") == 0)
+ ifp = stdin;
+ else if ((ifp = fopen(ifile, (f & f_bin) ? "rb" : "r")) == 0) {
+ die(EXIT_FAILURE, "couldn't open input file `%s': %s",
+ ifile, strerror(errno));
+ }
+
+ if (!ofile || strcmp(ofile, "-") == 0)
+ ofp = stdout;
+ else if ((ofp = fopen(ofile, (f & f_bin) ? "wb" : "w")) == 0) {
+ die(EXIT_FAILURE, "couldn't open output file `%s': %s",
+ ofile, strerror(errno));
+ }
+
+ /* --- Emit the start of the output --- */
+
+ binit(&b); b.tag = T_IDENT;
+ dstr_putf(&b.d, "%s, Catacomb version " VERSION, QUIS);
+ bemit(&b, ofp, 0, f & f_bin);
+
+ breset(&b); b.tag = T_KEYID; b.k = k->id;
+ bemit(&b, ofp, 0, f & f_bin);
+
+ /* --- Start hashing, and emit the datestamps and things --- */
+
+ {
+ time_t now = time(0);
+
+ breset(&b); b.tag = T_DATE; b.t = now; bemit(&b, ofp, s->h, f & f_bin);
+ if (exp == KEXP_EXPIRE)
+ exp = now + 86400 * 28;
+ breset(&b); b.tag = T_EXPIRE; b.t = exp; bemit(&b, ofp, s->h, f & f_bin);
+ if (c) {
+ breset(&b); b.tag = T_COMMENT; DPUTS(&b.d, c);
+ bemit(&b, ofp, s->h, f & f_bin);
+ }
+
+ if (!(f & f_bin))
+ putc('\n', ofp);
+ }
+
+ /* --- Now hash the various files --- */
+
+ if (hfile) {
+ hfp.f = f;
+ hfp.fp = ifp;
+ hfp.ee = &encodingtab[ENC_HEX];
+ hfp.gch = GH_CLASS(s->h);
+ hfp.dline = &d;
+ hfp.dfile = &b.d;
+
+ n = 0;
+ for (;;) {
+ breset(&b);
+ DENSURE(&b.b, hfp.gch->hashsz);
+ hfp.hbuf = (octet *)b.b.buf;
+ if (ferror(ofp)) { f |= f_bogus; break; }
+ if ((hf = hfparse(&hfp)) == HF_EOF) break;
+ n++;
+
+ switch (hf) {
+ case HF_HASH:
+ if (hfp.gch != GH_CLASS(s->h)) {
+ moan("%s:%d: incorrect hash function `%s' (should be `%s')",
+ hfile, n, hfp.gch->name, GH_CLASS(s->h)->name);
+ f |= f_bogus;
+ }
+ break;
+ case HF_BAD:
+ moan("%s:%d: invalid hash-file line", hfile, n);
+ f |= f_bogus;
+ break;
+ case HF_FILE:
+ b.tag = T_FILE;
+ b.b.len += hfp.gch->hashsz;
+ bemit(&b, ofp, s->h, f & f_bin);
+ break;
+ }
+ }
+ } else {
+ for (;;) {
+
+ /* --- Stop on an output error --- */
+
+ if (ferror(ofp)) {
+ f |= f_bogus;
+ break;
+ }
+
+ /* --- Read the next filename to hash --- */
+
+ fhash_init(&fh, GH_CLASS(s->h), f | FHF_BINARY);
+ breset(&b);
+ if (getstring(ifp, &b.d, GSF_FILE | f))
+ break;
+ b.tag = T_FILE;
+ DENSURE(&b.b, GH_CLASS(s->h)->hashsz);
+ if (fhash(&fh, b.d.buf, b.b.buf)) {
+ moan("error reading `%s': %s", b.d.buf, strerror(errno));
+ f |= f_bogus;
+ } else {
+ b.b.len += GH_CLASS(s->h)->hashsz;
+ if (verb) {
+ fhex(stderr, b.b.buf, b.b.len);
+ fprintf(stderr, " %s\n", b.d.buf);
+ }
+ bemit(&b, ofp, s->h, f & f_bin);
+ }
+ fhash_free(&fh);
+ }
+ }
+
+ /* --- Create the signature --- */
+
+ if (!(f & f_bogus)) {
+ breset(&b);
+ b.tag = T_SIGNATURE;
+ if ((e = s->ops->doit(s, &b.b)) != 0) {
+ moan("error creating signature: %s", key_strerror(e));
+ f |= f_bogus;
+ }
+ if (!(f & f_bogus)) {
+ bemit(&b, ofp, 0, f & f_bin);
+ key_used(&kf, k, exp);
+ }
+ }
+
+ /* --- Tidy up at the end --- */
+
+ freesig(s);
+ bdestroy(&b);
+ if (ifile)
+ fclose(ifp);
+ if (ofile) {
+ if (fclose(ofp))
+ f |= f_bogus;
+ } else {
+ if (fflush(ofp))
+ f |= f_bogus;
+ }
+ if ((e = key_close(&kf)) != 0) {
+ switch (e) {
+ case KWRITE_FAIL:
+ die(EXIT_FAILURE, "couldn't write file `%s': %s",
+ keyring, strerror(errno));
+ case KWRITE_BROKEN:
+ die(EXIT_FAILURE, "keyring file `%s' broken: %s (repair manually)",
+ keyring, strerror(errno));
+ }
+ }
+ if (f & f_bogus)
+ die(EXIT_FAILURE, "error(s) occurred while creating signature");
+ return (EXIT_SUCCESS);
+
+#undef f_bin
+#undef f_bogus
+#undef f_nocheck
+}
+
+/*----- Signature verification --------------------------------------------*/
+
+static int checkjunk(const char *path, const struct stat *st, void *p)
+{
+ if (!st) printf("JUNK (error %s) %s\n", strerror(errno), path);
+ else printf("JUNK %s %s\n", describefile(st), path);
+ return (0);
+}
+
+static int verify(int argc, char *argv[])
+{
+#define f_bogus 1u
+#define f_bin 2u
+#define f_ok 4u
+#define f_nocheck 8u
+
+ unsigned f = 0;
+ unsigned verb = 1;
+ key_file kf;
+ key *k = 0;
+ sig *s;
+ dstr d = DSTR_INIT;
+ const char *err;
+ fhashstate fh;
+ FILE *fp;
+ block b;
+ int e;
+
+ /* --- Parse the options --- */
+
+ for (;;) {
+ static struct option opts[] = {
+ { "verbose", 0, 0, 'v' },
+ { "progress", 0, 0, 'p' },
+ { "quiet", 0, 0, 'q' },
+ { "nocheck", 0, 0, 'C' },
+ { "junk", 0, 0, 'j' },
+ { 0, 0, 0, 0 }
+ };
+ int i = mdwopt(argc, argv, "+vpqCj", opts, 0, 0, 0);
+ if (i < 0)
+ break;
+ switch (i) {
+ case 'v':
+ verb++;
+ break;
+ case 'p':
+ f |= FHF_PROGRESS;
+ break;
+ case 'q':
+ if (verb)
+ verb--;
+ break;
+ case 'C':
+ f |= f_nocheck;
+ break;
+ case 'j':
+ f |= FHF_JUNK;
+ break;
+ default:
+ f |= f_bogus;
+ break;
+ }
+ }
+ argc -= optind;
+ argv += optind;
+ if ((f & f_bogus) || argc > 1)
+ die(EXIT_FAILURE, "Usage: verify [-qvC] [FILE]");
+
+ /* --- Open the key file, and start reading the input file --- */
+
+ if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0))
+ die(EXIT_FAILURE, "couldn't open keyring `%s'\n", keyring);
+ if (argc < 1)
+ fp = stdin;
+ else {
+ if ((fp = fopen(argv[0], "rb")) == 0) {
+ die(EXIT_FAILURE, "couldn't open file `%s': %s\n",
+ argv[0], strerror(errno));
+ }
+ if (getc(fp) == 0) {
+ ungetc(0, fp);
+ f |= f_bin;
+ } else {
+ fclose(fp);
+ if ((fp = fopen(argv[0], "r")) == 0) {
+ die(EXIT_FAILURE, "couldn't open file `%s': %s\n",
+ argv[0], strerror(errno));
+ }
+ }
+ }
+
+ /* --- Read the introductory matter --- */
+
+ binit(&b);
+ for (;;) {
+ breset(&b);
+ e = bget(&b, fp, f & f_bin);
+ if (e < 0)
+ die(EXIT_FAILURE, "error reading packet: %s", errtab[-e]);
+ if (e >= T_BEGIN)
+ break;
+ switch (e) {
+ case T_IDENT:
+ if (verb > 2)
+ printf("INFO ident: `%s'\n", b.d.buf);
+ break;
+ case T_KEYID:
+ if ((k = key_byid(&kf, b.k)) == 0) {
+ if (verb)
+ printf("FAIL key %08lx not found\n", (unsigned long)b.k);
+ exit(EXIT_FAILURE);
+ }
+ if (verb > 2) {
+ DRESET(&b.d);
+ key_fulltag(k, &b.d);
+ printf("INFO key: %s\n", b.d.buf);
+ }
+ break;
+ default:
+ die(EXIT_FAILURE, "(internal) unknown packet type\n");
+ break;
+ }
+ }
+
+ /* --- Initialize the hash function and start reading hashed packets --- */
+
+ if (!k) {
+ if (verb)
+ puts("FAIL no keyid packet found");
+ exit(EXIT_FAILURE);
+ }
+
+ s = getsig(k, "dsig", 0);
+ if (!(f & f_nocheck) && verb && (err = s->ops->check(s)) != 0)
+ printf("WARN public key fails check: %s", err);
+
+ fhash_init(&fh, GH_CLASS(s->h), f | FHF_BINARY);
+ for (;;) {
+ switch (e) {
+ case T_COMMENT:
+ if (verb > 1)
+ printf("INFO comment: `%s'\n", b.d.buf);
+ bemit(&b, 0, s->h, 0);
+ break;
+ case T_DATE:
+ if (verb > 2) {
+ DRESET(&b.d);
+ timestring(b.t, &b.d);
+ printf("INFO date: %s\n", b.d.buf);
+ }
+ bemit(&b, 0, s->h, 0);
+ break;
+ case T_EXPIRE: {
+ time_t now = time(0);
+ if (b.t != KEXP_FOREVER && b.t < now) {
+ if (verb > 1)
+ puts("BAD signature has expired");
+ f |= f_bogus;
+ }
+ if (verb > 2) {
+ DRESET(&b.d);
+ timestring(b.t, &b.d);
+ printf("INFO expires: %s\n", b.d.buf);
+ }
+ bemit(&b, 0, s->h, 0);
+ } break;
+ case T_FILE:
+ DRESET(&d);
+ DENSURE(&d, GH_CLASS(s->h)->hashsz);
+ if (fhash(&fh, b.d.buf, d.buf)) {
+ if (verb > 1) {
+ printf("BAD error reading file `%s': %s\n",
+ b.d.buf, strerror(errno));
+ }
+ f |= f_bogus;
+ } else if (b.b.len != GH_CLASS(s->h)->hashsz ||
+ memcmp(d.buf, b.b.buf, b.b.len) != 0) {
+ if (verb > 1)
+ printf("BAD file `%s' has incorrect hash\n", b.d.buf);
+ f |= f_bogus;
+ } else if (verb > 3) {
+ fputs("INFO hash: ", stdout);
+ fhex(stdout, b.b.buf, b.b.len);
+ printf(" %s\n", b.d.buf);
+ }
+ bemit(&b, 0, s->h, 0);
+ break;
+ case T_SIGNATURE:
+ if (s->ops->doit(s, &b.b)) {
+ if (verb > 1)
+ puts("BAD bad signature");
+ f |= f_bogus;
+ } else if (verb > 2)
+ puts("INFO good signature");
+ goto done;
+ default:
+ if (verb)
+ printf("FAIL invalid packet type %i\n", e);
+ exit(EXIT_FAILURE);
+ break;
+ }
+ breset(&b);
+ e = bget(&b, fp, f & f_bin);
+ if (e < 0) {
+ if (verb)
+ printf("FAIL error reading packet: %s\n", errtab[-e]);
+ exit(EXIT_FAILURE);
+ }
+ }
+done:
+ if ((f & FHF_JUNK) && fhash_junk(&fh, checkjunk, 0))
+ f |= f_bogus;
+ fhash_free(&fh);
+ bdestroy(&b);
+ dstr_destroy(&d);
+ freesig(s);
+ key_close(&kf);
+ if (fp != stdin)
+ fclose(fp);
+ if (verb) {
+ if (f & f_bogus)
+ puts("FAIL signature invalid");
+ else
+ puts("OK signature verified");
+ }
+ return (f & f_bogus ? EXIT_FAILURE : EXIT_SUCCESS);
+
+#undef f_bogus
+#undef f_bin
+#undef f_ok
+#undef f_nocheck
+}
+
+/*----- Main code ---------------------------------------------------------*/
+
+#define LISTS(LI) \
+ LI("Lists", list, \
+ listtab[i].name, listtab[i].name) \
+ LI("Signature schemes", sig, \
+ sigtab[i].name, sigtab[i].name) \
+ LI("Hash functions", hash, \
+ ghashtab[i], ghashtab[i]->name)
+
+MAKELISTTAB(listtab, LISTS)
+
+int cmd_show(int argc, char *argv[])
+{
+ return (displaylists(listtab, argv + 1));
+}
+
+static int cmd_help(int, char **);
+
+static cmd cmdtab[] = {
+ { "help", cmd_help, "help [COMMAND...]" },
+ { "show", cmd_show, "show [ITEM...]" },
+ { "sign", sign,
+ "sign [-0bpqvC] [-c COMMENT] [-k TAG] [-e EXPIRE]\n\t\
+[-f FILE] [-h FILE] [-o OUTPUT]",
+ "\
+Options:\n\
+\n\
+-0, --null Read null-terminated filenames from stdin.\n\
+-b, --binary Produce a binary output file.\n\
+-q, --quiet Produce fewer messages while working.\n\
+-v, --verbose Produce more messages while working.\n\
+-p, --progress Show progress on large files.\n\
+-C, --nocheck Don't check the private key.\n\
+-c, --comment=COMMENT Include COMMENT in the output file.\n\
+-f, --file=FILE Read filenames to hash from FILE.\n\
+-h, --hashes=FILE Read precomputed hashes from FILE.\n\
+-o, --output=FILE Write the signed result to FILE.\n\
+-k, --key=TAG Use a key named by TAG.\n\
+-e, --expire=TIME The signature should expire after TIME.\n\
+" },
+ { "verify", verify,
+ "verify [-pqvC] [FILE]", "\
+Options:\n\
+\n\
+-q, --quiet Produce fewer messages while working.\n\
+-v, --verbose Produce more messages while working.\n\
+-p, --progress Show progress on large files.\n\
+-C, --nocheck Don't check the public key.\n\
+" },
+ { 0, 0, 0 }
+};
+
+static int cmd_help(int argc, char **argv)
+{
+ sc_help(cmdtab, stdout, argv + 1);
+ return (0);
+}
+
+void version(FILE *fp)
+{
+ pquis(fp, "$, Catacomb version " VERSION "\n");
+}
+
+static void usage(FILE *fp)
+{
+ pquis(fp, "Usage: $ [-k KEYRING] COMMAND [ARGS]\n");
+}
+
+void help_global(FILE *fp)
+{
+ usage(fp);
+ fputs("\n\
+Create and verify signatures on lists of files.\n\
+\n\
+Global command-line options:\n\
+\n\
+-h, --help [COMMAND...] Show this help message, or help for COMMANDs.\n\
+-v, --version Show program version number.\n\
+-u, --usage Show a terse usage message.\n\
+\n\
+-k, --keyring=FILE Read keys from FILE.\n",
+ fp);
+}
+
+/* --- @main@ --- *
+ *
+ * Arguments: @int argc@ = number of command line arguments
+ * @char *argv[]@ = vector of command line arguments
+ *
+ * Returns: Zero if successful, nonzero otherwise.
+ *
+ * Use: Signs or verifies signatures on lists of files. Useful for
+ * ensuring that a distribution is unmolested.
+ */
+
+int main(int argc, char *argv[])
+{
+ unsigned f = 0;
+
+#define f_bogus 1u
+
+ /* --- Initialize the library --- */
+
+ ego(argv[0]);
+ sub_init();
+ rand_noisesrc(RAND_GLOBAL, &noise_source);
+ rand_seed(RAND_GLOBAL, 160);
+
+ /* --- Parse options --- */
+
+ for (;;) {
+ static struct option opts[] = {
+ { "help", 0, 0, 'h' },
+ { "version", 0, 0, 'v' },
+ { "usage", 0, 0, 'u' },
+ { "keyring", OPTF_ARGREQ, 0, 'k' },
+ { 0, 0, 0, 0 }
+ };
+ int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0);
+ if (i < 0)
+ break;
+ switch (i) {
+ case 'h':
+ sc_help(cmdtab, stdout, argv + optind);
+ exit(0);
+ break;
+ case 'v':
+ version(stdout);
+ exit(0);
+ break;
+ case 'u':
+ usage(stdout);
+ exit(0);
+ case 'k':
+ keyring = optarg;
+ break;
+ default:
+ f |= f_bogus;
+ break;
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+ optind = 0;
+ if (f & f_bogus || argc < 1) {
+ usage(stderr);
+ exit(EXIT_FAILURE);
+ }
+
+ /* --- Dispatch to the correct subcommand handler --- */
+
+ return (findcmd(cmdtab, argv[0])->cmd(argc, argv));
+
+#undef f_bogus
+}
+
+/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff