--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: dsig.c,v 1.1 2000/06/17 10:54:29 mdw Exp $
+ *
+ * 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: dsig.c,v $
+ * Revision 1.1 2000/06/17 10:54:29 mdw
+ * Program to generate and verify signatures on multiple files.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#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 "dsa.h"
+#include "getdate.h"
+#include "grand.h"
+#include "ghash.h"
+#include "key.h"
+#include "key-data.h"
+#include "md5.h"
+#include "noise.h"
+#include "rmd160.h"
+#include "rsa.h"
+#include "sha.h"
+
+/*----- Digital signature algorithm ---------------------------------------*/
+
+static int dsasign(key *k, const void *m, size_t msz, dstr *d)
+{
+ dsa_priv dp;
+ key_packstruct ks[DSA_PRIVFETCHSZ];
+ key_packdef *kp;
+ size_t sz;
+ octet *p;
+ int e;
+
+ kp = key_fetchinit(dsa_privfetch, ks, &dp);
+ if ((e = key_fetch(kp, k)) != 0) {
+ key_fetchdone(kp);
+ return (e);
+ }
+ sz = mp_octets(dp.dp.q);
+ DENSURE(d, sz * 2);
+ p = d->buf + d->len;
+ rand_get(RAND_GLOBAL, p, sz);
+ dsa_sign(&dp.dp, dp.x, m, msz, p, sz, p, sz, p + sz, sz);
+ d->len += sz * 2;
+ key_fetchdone(kp);
+ return (0);
+}
+
+static int dsaverify(key *k, const void *m, size_t msz,
+ const void *s, size_t ssz)
+{
+ dsa_pub dp;
+ key_packstruct ks[DSA_PUBFETCHSZ];
+ key_packdef *kp;
+ size_t sz;
+ int e;
+
+ kp = key_fetchinit(dsa_pubfetch, ks, &dp);
+ if ((e = key_fetch(kp, k)) != 0) {
+ key_fetchdone(kp);
+ return (e);
+ }
+ sz = ssz / 2;
+ e = dsa_verify(&dp.dp, dp.y, m, msz, s, sz, s + sz, sz);
+ key_fetchdone(kp);
+ return (e);
+}
+
+/*----- RSA signing -------------------------------------------------------*/
+
+static int rsasign(key *k, const void *m, size_t msz, dstr *d)
+{
+ rsa_priv rp;
+ key_packstruct ks[RSA_PRIVFETCHSZ];
+ key_packdef *kp;
+ octet *p;
+ size_t sz;
+ mp *x;
+ int e;
+
+ kp = key_fetchinit(rsa_privfetch, ks, &rp);
+ if ((e = key_fetch(kp, k)) != 0) {
+ key_fetchdone(kp);
+ return (e);
+ }
+ sz = mp_octets(rp.n);
+ if (sz < msz + 11)
+ die(EXIT_FAILURE, "key too small (help!)");
+ DENSURE(d, sz);
+ p = d->buf + d->len;
+ memcpy(p + sz - msz, m, msz);
+ p[0] = 0;
+ p[1] = 1;
+ memset(p + 2, 0xff, sz - msz - 3);
+ p[sz - msz - 1] = 0;
+ memcpy(p + sz - msz, m, msz);
+ x = mp_loadb(MP_NEW, p, sz);
+ x = rsa_decrypt(&rp, x, x, &rand_global);
+ mp_storeb(x, p, sz);
+ d->len += sz;
+ mp_drop(x);
+ key_fetchdone(kp);
+ return (0);
+}
+
+static int rsaverify(key *k, const void *m, size_t msz,
+ const void *s, size_t ssz)
+{
+ rsa_pub rp;
+ key_packstruct ks[RSA_PUBFETCHSZ];
+ key_packdef *kp;
+ octet *p;
+ size_t sz;
+ mp *x;
+ mpmont mm;
+ int ok = 0;
+ int e;
+ int i;
+
+ kp = key_fetchinit(rsa_pubfetch, ks, &rp);
+ if ((e = key_fetch(kp, k)) != 0) {
+ key_fetchdone(kp);
+ return (e);
+ }
+ x = mp_loadb(MP_NEW, s, ssz);
+ mpmont_create(&mm, rp.n);
+ x = mpmont_exp(&mm, x, x, rp.e);
+ mpmont_destroy(&mm);
+ sz = mp_octets(rp.n);
+ p = xmalloc(sz);
+ mp_storeb(x, p, sz);
+ mp_drop(x);
+ key_fetchdone(kp);
+ if (msz + 11 >= sz || p[0] != 0 || p[1] != 1 || p[sz - msz - 1] != 0)
+ goto done;
+ for (i = 2; i < sz - msz - 1; i++) {
+ if (p[i] != 0xff)
+ goto done;
+ }
+ if (memcmp(m, p + sz - msz, msz) != 0)
+ goto done;
+ ok = 1;
+done:
+ free(p);
+ return (ok);
+}
+
+/*----- Algorithm choice --------------------------------------------------*/
+
+typedef struct sig {
+ const char *name;
+ const char *type;
+ int (*sign)(key */*k*/, const void */*m*/, size_t /*msz*/, dstr */*d*/);
+ int (*verify)(key */*k*/, const void */*m*/, size_t /*msz*/,
+ const void */*s*/, size_t /*ssz*/);
+} sig;
+
+static const gchash *hashtab[] = { &rmd160, &sha, &md5, 0 };
+static sig sigtab[] = {
+ { "dsa", "dsig-dsa", dsasign, dsaverify },
+ { "rsa", "dsig-rsa", rsasign, rsaverify },
+ { 0, 0, 0 }
+};
+
+/* --- @gethash@ --- *
+ *
+ * Arguments: @const char *name@ = pointer to name string
+ *
+ * Returns: Pointer to appropriate hash class.
+ *
+ * Use: Chooses a hash function by name.
+ */
+
+static const gchash *gethash(const char *name)
+{
+ const gchash **g, *gg = 0;
+ size_t sz = strlen(name);
+ for (g = hashtab; *g; g++) {
+ if (strncmp(name, (*g)->name, sz) == 0) {
+ if ((*g)->name[sz] == 0) {
+ gg = *g;
+ break;
+ } else if (gg)
+ return (0);
+ else
+ gg = *g;
+ }
+ }
+ return (gg);
+}
+
+/* --- @getsig@ --- *
+ *
+ * Arguments: @const char *name@ = pointer to name string
+ *
+ * Returns: Pointer to appropriate signature type.
+ *
+ * Use: Chooses a signature algorithm by name.
+ */
+
+static sig *getsig(const char *name)
+{
+ sig *s, *ss = 0;
+ size_t sz = strlen(name);
+ for (s = sigtab; s->name; s++) {
+ if (strncmp(name, s->name, sz) == 0) {
+ if (s->name[sz] == 0) {
+ ss = s;
+ break;
+ } else if (ss)
+ return (0);
+ else
+ ss = s;
+ }
+ }
+ return (ss);
+}
+
+/*----- 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_SIGALG, /* Signature algorithm used */
+ T_HASHALG, /* Hash algorithm used */
+ 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:", "sigalg:", "hashalg:", "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;
+
+/* --- @getstring@ --- *
+ *
+ * Arguments: @FILE *fp@ = stream from which to read
+ * @dstr *d@ = destination string
+ * @unsigned raw@ = raw or cooked read
+ *
+ * Returns: Zero if OK, nonzero on end-of-file.
+ *
+ * Use: Reads a filename (or something similar) from a stream.
+ */
+
+static int getstring(FILE *fp, dstr *d, unsigned raw)
+{
+ int ch;
+ int q = 0;
+
+ /* --- Raw: just read exactly what's written up to a null byte --- */
+
+ if (raw) {
+ if ((ch = getc(fp)) == EOF)
+ return (EOF);
+ for (;;) {
+ if (!ch)
+ break;
+ DPUTC(d, ch);
+ if ((ch = getc(fp)) == EOF)
+ break;
+ }
+ DPUTZ(d);
+ return (0);
+ }
+
+ /* --- Skip as far as whitespace --- *
+ *
+ * Also skip past comments.
+ */
+
+again:
+ ch = getc(fp);
+ while (isspace((unsigned char)ch))
+ ch = getc(fp);
+ if (ch == '#') {
+ do ch = getc(fp); while (ch != '\n' && ch != EOF);
+ goto again;
+ }
+ if (ch == EOF)
+ return (EOF);
+
+ /* --- If the character is a quote then read a quoted string --- */
+
+ switch (ch) {
+ case '`':
+ ch = '\'';
+ case '\'':
+ case '\"':
+ q = ch;
+ ch = getc(fp);
+ break;
+ }
+
+ /* --- Now read all sorts of interesting things --- */
+
+ for (;;) {
+
+ /* --- Handle an escaped thing --- */
+
+ if (ch == '\\') {
+ ch = getc(fp);
+ if (ch == EOF)
+ break;
+ switch (ch) {
+ case 'a': ch = '\n'; break;
+ case 'b': ch = '\b'; break;
+ case 'f': ch = '\f'; break;
+ case 'n': ch = '\n'; break;
+ case 'r': ch = '\r'; break;
+ case 't': ch = '\t'; break;
+ case 'v': ch = '\v'; break;
+ }
+ DPUTC(d, ch);
+ continue;
+ }
+
+ /* --- If it's a quote or some other end marker then stop --- */
+
+ if (ch == q || (!q && isspace((unsigned char)ch)))
+ break;
+
+ /* --- Otherwise contribute and continue --- */
+
+ DPUTC(d, ch);
+ if ((ch = getc(fp)) == EOF)
+ break;
+ }
+
+ /* --- Done --- */
+
+ DPUTZ(d);
+ return (0);
+}
+
+/* --- @putstring@ --- *
+ *
+ * Arguments: @FILE *fp@ = stream to write on
+ * @const char *p@ = pointer to text
+ * @unsigned raw@ = whether the string is to be written raw
+ *
+ * Returns: ---
+ *
+ * Use: Emits a string to a stream.
+ */
+
+static void putstring(FILE *fp, const char *p, unsigned raw)
+{
+ size_t sz = strlen(p);
+ unsigned qq;
+ const char *q;
+
+ /* --- Just write the string null terminated if raw --- */
+
+ if (raw) {
+ fwrite(p, 1, sz + 1, fp);
+ return;
+ }
+
+ /* --- Check for any dodgy characters --- */
+
+ qq = 0;
+ for (q = p; *q; q++) {
+ if (isspace((unsigned char)*q)) {
+ qq = '\"';
+ break;
+ }
+ }
+
+ if (qq)
+ putc(qq, fp);
+
+ /* --- Emit the string --- */
+
+ for (q = p; *q; q++) {
+ switch (*q) {
+ case '\a': fputc('\\', fp); fputc('a', fp); break;
+ case '\b': fputc('\\', fp); fputc('b', fp); break;
+ case '\f': fputc('\\', fp); fputc('f', fp); break;
+ case '\n': fputc('\\', fp); fputc('n', fp); break;
+ case '\r': fputc('\\', fp); fputc('r', fp); break;
+ case '\t': fputc('\\', fp); fputc('t', fp); break;
+ case '\v': fputc('\\', fp); fputc('v', fp); break;
+ case '`': fputc('\\', fp); fputc('`', fp); break;
+ case '\'': fputc('\\', fp); fputc('\'', fp); break;
+ case '\"': fputc('\\', fp); fputc('\"', fp); break;
+ default:
+ putc(*q, fp);
+ break;
+ }
+ }
+
+ /* --- Done --- */
+
+ if (qq)
+ putc(qq, fp);
+}
+
+/* --- @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, 0))
+ 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:
+ case T_SIGALG:
+ case T_HASHALG:
+ if (getstring(fp, &b->d, bin))
+ 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, 0))
+ 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, 0))
+ 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, 0))
+ 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, bin))
+ 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_SIGALG:
+ case T_HASHALG:
+ case T_COMMENT:
+ DPUTD(d, &b->d);
+ DPUTC(d, 0);
+ break;
+ case T_DATE:
+ case T_EXPIRE:
+ DENSURE(d, 8);
+ 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_SIGALG:
+ case T_HASHALG:
+ 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)
+ h->ops->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 --------------------------------------------*/
+
+/* --- @keyreport@ --- *
+ *
+ * Arguments: @const char *file@ = filename containing the error
+ * @int line@ = line number in file
+ * @const char *err@ = error text message
+ * @void *p@ = unimportant pointer
+ *
+ * Returns: ---
+ *
+ * Use: Reports errors during the opening of a key file.
+ */
+
+static void keyreport(const char *file, int line, const char *err, void *p)
+{
+ moan("error in keyring `%s' at line `%s': %s", file, line, err);
+}
+
+/* --- @fhash@ --- *
+ *
+ * Arguments: @const gchash *c@ = pointer to hash class
+ * @const char *file@ = file to hash
+ * @octet *b@ = pointer to output buffer
+ *
+ * Returns: Zero if it worked, or nonzero for a system error.
+ *
+ * Use: Hashes a file.
+ */
+
+static int fhash(const gchash *c, const char *file, octet *b)
+{
+ FILE *fp = fopen(file, "rb");
+ ghash *h = c->init();
+ char buf[4096];
+ size_t sz;
+ int rc = 0;
+
+ if (!fp)
+ return (-1);
+ while ((sz = fread(buf, 1, sizeof(buf), fp)) > 0)
+ h->ops->hash(h, buf, sz);
+ if (ferror(fp))
+ rc = -1;
+ h->ops->done(h, b);
+ h->ops->destroy(h);
+ fclose(fp);
+ return (rc);
+}
+
+/* --- @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;
+/* putc(' ', fp); */
+ }
+}
+
+/*----- Signature generation ----------------------------------------------*/
+
+static int sign(int argc, char *argv[])
+{
+ enum {
+ f_raw = 1,
+ f_bin = 2,
+ f_bogus = 4
+ };
+
+ unsigned f = 0;
+ const char *kt = 0;
+ const char *ki = 0;
+ key_file kf;
+ key *k;
+ const sig *s = sigtab;
+ const gchash *gch = &rmd160;
+ ghash *h;
+ time_t exp = KEXP_EXPIRE;
+ unsigned verb = 0;
+ const char *ifile = 0;
+ const char *ofile = 0;
+ const char *c = 0;
+ FILE *ifp, *ofp;
+ dstr d = DSTR_INIT;
+ block b;
+ int e;
+
+ for (;;) {
+ static struct option opts[] = {
+ { "null", 0, 0, '0' },
+ { "binary", 0, 0, 'b' },
+ { "verbose", 0, 0, 'v' },
+ { "quiet", 0, 0, 'q' },
+ { "algorithm", OPTF_ARGREQ, 0, 'a' },
+ { "hash", OPTF_ARGREQ, 0, 'h' },
+ { "comment", OPTF_ARGREQ, 0, 'c' },
+ { "file", OPTF_ARGREQ, 0, 'f' },
+ { "output", OPTF_ARGREQ, 0, 'o' },
+ { "keytype", OPTF_ARGREQ, 0, 't' },
+ { "keyid", OPTF_ARGREQ, 0, 'i' },
+ { "key", OPTF_ARGREQ, 0, 'i' },
+ { "expire", OPTF_ARGREQ, 0, 'e' },
+ { 0, 0, 0, 0 }
+ };
+ int i = mdwopt(argc, argv, "+0vqb a:h:c: f:o: t:i:k:e:", opts, 0, 0, 0);
+ if (i < 0)
+ break;
+ switch (i) {
+ case '0':
+ f |= f_raw;
+ break;
+ case 'b':
+ f |= f_bin;
+ break;
+ case 'v':
+ verb++;
+ break;
+ case 'q':
+ if (verb > 0)
+ verb--;
+ break;
+ case 'a':
+ if ((s = getsig(optarg)) == 0) {
+ die(EXIT_FAILURE, "unknown or ambiguous signature algorithm `%s'",
+ optarg);
+ }
+ break;
+ case 'h':
+ if ((gch = gethash(optarg)) == 0) {
+ die(EXIT_FAILURE, "unknown or ambiguous hash function `%s'",
+ optarg);
+ }
+ break;
+ case 'c':
+ c = optarg;
+ break;
+ case 'f':
+ ifile = optarg;
+ break;
+ case 'o':
+ ofile = optarg;
+ break;
+ case 't':
+ kt = optarg;
+ break;
+ case 'i':
+ 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]");
+
+ /* --- Locate the signing key --- */
+
+ if (key_open(&kf, keyring, KOPEN_WRITE, keyreport, 0))
+ die(EXIT_FAILURE, "couldn't open keyring `%s'", keyring);
+ if (ki) {
+ if ((k = key_bytag(&kf, ki)) == 0)
+ die(EXIT_FAILURE, "couldn't find key `%s'", ki);
+ } else {
+ if (!kt)
+ kt = s->type;
+ if ((k = key_bytype(&kf, kt)) == 0)
+ die(EXIT_FAILURE, "no appropriate key of type `%s'", kt);
+ }
+ 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);
+ }
+
+ /* --- Open files --- */
+
+ if (!ifile)
+ ifp = stdin;
+ else if ((ifp = fopen(ifile, (f & f_raw) ? "rb" : "r")) == 0) {
+ die(EXIT_FAILURE, "couldn't open input file `%s': %s",
+ ifile, strerror(errno));
+ }
+
+ if (!ofile)
+ 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_SIGALG; DPUTS(&b.d, s->name);
+ bemit(&b, ofp, 0, f & f_bin);
+
+ breset(&b); b.tag = T_HASHALG; DPUTS(&b.d, gch->name);
+ 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);
+
+ h = gch->init();
+ breset(&b); b.tag = T_DATE; b.t = now; bemit(&b, ofp, h, f & f_bin);
+ if (exp == KEXP_EXPIRE)
+ exp = now + 86400 * 28;
+ breset(&b); b.tag = T_EXPIRE; b.t = exp; bemit(&b, ofp, h, f & f_bin);
+ if (c) {
+ breset(&b); b.tag = T_COMMENT; DPUTS(&b.d, c);
+ bemit(&b, ofp, h, f & f_bin);
+ }
+
+ if (!(f & f_bin))
+ putc('\n', ofp);
+ }
+
+ /* --- Now hash the various files --- */
+
+ for (;;) {
+
+ /* --- Stop on an output error --- */
+
+ if (ferror(ofp)) {
+ f |= f_bogus;
+ break;
+ }
+
+ /* --- Read the next filename to hash --- */
+
+ breset(&b);
+ if (getstring(ifp, &b.d, f & f_raw))
+ break;
+ b.tag = T_FILE;
+ DENSURE(&b.b, h->ops->c->hashsz);
+ if (fhash(gch, b.d.buf, b.b.buf)) {
+ moan("Error reading `%s': %s", b.d.buf, strerror(errno));
+ f |= f_bogus;
+ } else {
+ b.b.len += h->ops->c->hashsz;
+ if (verb) {
+ fhex(stderr, b.b.buf, b.b.len);
+ fprintf(stderr, " %s\n", b.d.buf);
+ }
+ bemit(&b, ofp, h, f & f_bin);
+ }
+ }
+
+ /* --- Create the signature --- */
+
+ if (!(f & f_bogus)) {
+ breset(&b);
+ b.tag = T_SIGNATURE;
+ DENSURE(&b.d, h->ops->c->hashsz);
+ h->ops->done(h, b.d.buf);
+ if ((e = s->sign(k, b.d.buf, h->ops->c->hashsz, &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 --- */
+
+ 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);
+}
+
+/*----- Signature verification --------------------------------------------*/
+
+static int verify(int argc, char *argv[])
+{
+ enum {
+ f_bogus = 1,
+ f_bin = 2,
+ f_ok = 4
+ };
+
+ unsigned f = 0;
+ unsigned verb = 1;
+ key_file kf;
+ key *k = 0;
+ sig *s = sigtab;
+ const gchash *gch = &rmd160;
+ dstr d = DSTR_INIT;
+ ghash *h;
+ FILE *fp;
+ block b;
+ int e;
+
+ /* --- Parse the options --- */
+
+ for (;;) {
+ static struct option opts[] = {
+ { "verbose", 0, 0, 'v' },
+ { "quiet", 0, 0, 'q' },
+ { 0, 0, 0, 0 }
+ };
+ int i = mdwopt(argc, argv, "+vq", opts, 0, 0, 0);
+ if (i < 0)
+ break;
+ switch (i) {
+ case 'v':
+ verb++;
+ break;
+ case 'q':
+ if (verb)
+ verb--;
+ break;
+ default:
+ f |= f_bogus;
+ break;
+ }
+ }
+ argc -= optind;
+ argv += optind;
+ if ((f & f_bogus) || argc > 1)
+ die(EXIT_FAILURE, "Usage: verify [-qv] [file]");
+
+ /* --- Open the key file, and start reading the input file --- */
+
+ if (key_open(&kf, keyring, KOPEN_READ, keyreport, 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\n", 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_SIGALG:
+ if ((s = getsig(b.d.buf)) == 0) {
+ if (verb)
+ printf("FAIL unknown signature algorithm `%s'\n", b.d.buf);
+ exit(EXIT_FAILURE);
+ }
+ if (verb > 2)
+ printf("INFO signature algorithm: %s\n", s->name);
+ break;
+ case T_HASHALG:
+ if ((gch = gethash(b.d.buf)) == 0) {
+ if (verb)
+ printf("FAIL unknown hash function `%s'\n", b.d.buf);
+ exit(EXIT_FAILURE);
+ }
+ if (verb > 2)
+ printf("INFO hash function algorithm: %s\n", gch->name);
+ 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 --- */
+
+ h = gch->init();
+ if (!k) {
+ if (verb)
+ puts("FAIL no keyid packet found");
+ exit(EXIT_FAILURE);
+ }
+ for (;;) {
+ switch (e) {
+ case T_COMMENT:
+ if (verb > 1)
+ printf("INFO comment: `%s'\n", b.d.buf);
+ bemit(&b, 0, 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, h, 0);
+ break;
+ case T_EXPIRE: {
+ time_t now = time(0);
+ if (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, h, 0);
+ } break;
+ case T_FILE:
+ DRESET(&d);
+ DENSURE(&d, gch->hashsz);
+ if (fhash(gch, 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 != gch->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, h, 0);
+ break;
+ case T_SIGNATURE:
+ DRESET(&b.d);
+ DENSURE(&b.d, h->ops->c->hashsz);
+ b.d.len += h->ops->c->hashsz;
+ h->ops->done(h, b.d.buf);
+ e = s->verify(k, b.d.buf, b.d.len, b.b.buf, b.b.len);
+ if (e != 1) {
+ if (verb > 1) {
+ if (e < 0) {
+ printf("BAD error unpacking key: %s\n", key_strerror(e));
+ } else
+ 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:
+ bdestroy(&b);
+ dstr_destroy(&d);
+ 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);
+}
+
+/*----- Main code ---------------------------------------------------------*/
+
+typedef struct cmd {
+ const char *name;
+ int (*func)(int /*argc*/, char */*argv*/[]);
+ const char *help;
+} cmd;
+
+static cmd cmdtab[] = {
+/* { "manifest", manifest, */
+/* "manifest [-0] [-o output]" }, */
+ { "sign", sign,
+ "sign [-options]\n\
+ [-0v] [-a alg] [-h hash] [-t keytype] [-i keyid]\n\
+ [-e expire] [-f file] [-o output]" },
+ { "verify", verify,
+ "verify [-qv] [file]" },
+ { 0, 0, 0 }
+};
+
+static void version(FILE *fp)
+{
+ pquis(fp, "$, Catacomb version " VERSION "\n");
+}
+
+static void usage(FILE *fp)
+{
+ pquis(fp, "Usage: $ [-k keyring] command [args]\n");
+}
+
+static void help(FILE *fp)
+{
+ cmd *c;
+ version(fp);
+ fputc('\n', fp);
+ usage(fp);
+ fputs("\n\
+Create and verify signatures on lists of files.\n\
+\n", fp);
+ for (c = cmdtab; c->name; c++)
+ fprintf(fp, "%s\n", c->help);
+}
+
+/* --- @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;
+ cmd *c = 0, *cc = 0;
+ size_t n;
+
+ enum {
+ f_bogus = 1
+ };
+
+ /* --- 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':
+ help(stdout);
+ 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 --- */
+
+ n = strlen(argv[0]);
+ for (c = cmdtab; c->name; c++) {
+ if (strncmp(argv[0], c->name, n) == 0) {
+ if (c->name[n] == 0) {
+ cc = c;
+ break;
+ } else if (cc)
+ die(EXIT_FAILURE, "ambiguous command name `%s'", argv[0]);
+ else
+ cc = c;
+ }
+ }
+ if (!cc)
+ die(EXIT_FAILURE, "unknown command `%s'", argv[0]);
+ return (cc->func(argc, argv));
+}
+
+/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / commitdiff