mirror of git://git.gnupg.org/gnupg.git
1331 lines
30 KiB
C
1331 lines
30 KiB
C
/* protect-tool.c - A tool to test the secret key protection
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* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#ifdef HAVE_LANGINFO_CODESET
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#include <langinfo.h>
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#endif
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#ifdef HAVE_DOSISH_SYSTEM
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#include <fcntl.h> /* for setmode() */
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#endif
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#define JNLIB_NEED_LOG_LOGV
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#include "agent.h"
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#include "minip12.h"
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#include "simple-pwquery.h"
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#include "i18n.h"
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#include "sysutils.h"
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enum cmd_and_opt_values
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{ aNull = 0,
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oVerbose = 'v',
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oArmor = 'a',
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oPassphrase = 'P',
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oProtect = 'p',
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oUnprotect = 'u',
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oNoVerbose = 500,
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oShadow,
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oShowShadowInfo,
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oShowKeygrip,
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oCanonical,
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oP12Import,
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oP12Export,
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oP12Charset,
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oStore,
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oForce,
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oHaveCert,
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oNoFailOnExist,
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oHomedir,
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oPrompt,
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oStatusMsg,
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aTest };
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struct rsa_secret_key_s
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{
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gcry_mpi_t n; /* public modulus */
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gcry_mpi_t e; /* public exponent */
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gcry_mpi_t d; /* exponent */
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gcry_mpi_t p; /* prime p. */
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gcry_mpi_t q; /* prime q. */
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gcry_mpi_t u; /* inverse of p mod q. */
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};
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static const char *opt_homedir;
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static int opt_armor;
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static int opt_canonical;
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static int opt_store;
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static int opt_force;
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static int opt_no_fail_on_exist;
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static int opt_have_cert;
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static const char *opt_passphrase;
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static char *opt_prompt;
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static int opt_status_msg;
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static const char *opt_p12_charset;
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static char *get_passphrase (int promptno, int opt_check);
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static char *get_new_passphrase (int promptno);
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static void release_passphrase (char *pw);
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static int store_private_key (const unsigned char *grip,
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const void *buffer, size_t length, int force);
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static ARGPARSE_OPTS opts[] = {
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{ 301, NULL, 0, N_("@Options:\n ") },
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{ oVerbose, "verbose", 0, "verbose" },
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{ oArmor, "armor", 0, "write output in advanced format" },
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{ oCanonical, "canonical", 0, "write output in canonical format" },
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{ oPassphrase, "passphrase", 2, "|STRING|use passphrase STRING" },
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{ oProtect, "protect", 256, "protect a private key"},
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{ oUnprotect, "unprotect", 256, "unprotect a private key"},
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{ oShadow, "shadow", 256, "create a shadow entry for a public key"},
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{ oShowShadowInfo, "show-shadow-info", 256, "return the shadow info"},
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{ oShowKeygrip, "show-keygrip", 256, "show the \"keygrip\""},
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{ oP12Import, "p12-import", 256, "import a pkcs#12 encoded private key"},
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{ oP12Export, "p12-export", 256, "export a private key pkcs#12 encoded"},
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{ oP12Charset,"p12-charset", 2,
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"|NAME|set charset for a new PKCS#12 passphrase to NAME" },
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{ oHaveCert, "have-cert", 0, "certificate to export provided on STDIN"},
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{ oStore, "store", 0, "store the created key in the appropriate place"},
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{ oForce, "force", 0, "force overwriting"},
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{ oNoFailOnExist, "no-fail-on-exist", 0, "@" },
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{ oHomedir, "homedir", 2, "@" },
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{ oPrompt, "prompt", 2, "|ESCSTRING|use ESCSTRING as prompt in pinentry"},
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{ oStatusMsg, "enable-status-msg", 0, "@"},
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{0}
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};
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static const char *
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my_strusage (int level)
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{
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const char *p;
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switch (level)
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{
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case 11: p = "gpg-protect-tool (GnuPG)";
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break;
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case 13: p = VERSION; break;
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case 17: p = PRINTABLE_OS_NAME; break;
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case 19: p = _("Please report bugs to <" PACKAGE_BUGREPORT ">.\n");
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break;
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case 1:
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case 40: p = _("Usage: gpg-protect-tool [options] (-h for help)\n");
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break;
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case 41: p = _("Syntax: gpg-protect-tool [options] [args]\n"
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"Secret key maintenance tool\n");
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break;
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default: p = NULL;
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}
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return p;
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}
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/* static void */
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/* print_mpi (const char *text, gcry_mpi_t a) */
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/* { */
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/* char *buf; */
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/* void *bufaddr = &buf; */
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/* int rc; */
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/* rc = gcry_mpi_aprint (GCRYMPI_FMT_HEX, bufaddr, NULL, a); */
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/* if (rc) */
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/* log_info ("%s: [error printing number: %s]\n", text, gpg_strerror (rc)); */
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/* else */
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/* { */
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/* log_info ("%s: %s\n", text, buf); */
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/* gcry_free (buf); */
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/* } */
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/* } */
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static unsigned char *
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make_canonical (const char *fname, const char *buf, size_t buflen)
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{
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int rc;
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size_t erroff, len;
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gcry_sexp_t sexp;
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unsigned char *result;
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rc = gcry_sexp_sscan (&sexp, &erroff, buf, buflen);
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if (rc)
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{
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log_error ("invalid S-Expression in `%s' (off=%u): %s\n",
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fname, (unsigned int)erroff, gpg_strerror (rc));
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return NULL;
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}
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len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_CANON, NULL, 0);
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assert (len);
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result = xmalloc (len);
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len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_CANON, result, len);
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assert (len);
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gcry_sexp_release (sexp);
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return result;
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}
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static char *
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make_advanced (const unsigned char *buf, size_t buflen)
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{
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int rc;
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size_t erroff, len;
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gcry_sexp_t sexp;
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char *result;
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rc = gcry_sexp_sscan (&sexp, &erroff, (const char*)buf, buflen);
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if (rc)
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{
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log_error ("invalid canonical S-Expression (off=%u): %s\n",
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(unsigned int)erroff, gpg_strerror (rc));
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return NULL;
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}
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len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_ADVANCED, NULL, 0);
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assert (len);
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result = xmalloc (len);
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len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_ADVANCED, result, len);
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assert (len);
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gcry_sexp_release (sexp);
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return result;
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}
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static char *
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read_file (const char *fname, size_t *r_length)
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{
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FILE *fp;
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char *buf;
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size_t buflen;
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if (!strcmp (fname, "-"))
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{
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size_t nread, bufsize = 0;
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fp = stdin;
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#ifdef HAVE_DOSISH_SYSTEM
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setmode ( fileno(fp) , O_BINARY );
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#endif
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buf = NULL;
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buflen = 0;
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#define NCHUNK 8192
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do
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{
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bufsize += NCHUNK;
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if (!buf)
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buf = xmalloc (bufsize);
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else
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buf = xrealloc (buf, bufsize);
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nread = fread (buf+buflen, 1, NCHUNK, fp);
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if (nread < NCHUNK && ferror (fp))
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{
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log_error ("error reading `[stdin]': %s\n", strerror (errno));
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xfree (buf);
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return NULL;
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}
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buflen += nread;
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}
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while (nread == NCHUNK);
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#undef NCHUNK
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}
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else
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{
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struct stat st;
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fp = fopen (fname, "rb");
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if (!fp)
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{
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log_error ("can't open `%s': %s\n", fname, strerror (errno));
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return NULL;
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}
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if (fstat (fileno(fp), &st))
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{
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log_error ("can't stat `%s': %s\n", fname, strerror (errno));
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fclose (fp);
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return NULL;
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}
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buflen = st.st_size;
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buf = xmalloc (buflen+1);
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if (fread (buf, buflen, 1, fp) != 1)
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{
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log_error ("error reading `%s': %s\n", fname, strerror (errno));
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fclose (fp);
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xfree (buf);
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return NULL;
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}
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fclose (fp);
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}
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*r_length = buflen;
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return buf;
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}
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static unsigned char *
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read_key (const char *fname)
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{
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char *buf;
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size_t buflen;
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unsigned char *key;
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buf = read_file (fname, &buflen);
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if (!buf)
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return NULL;
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key = make_canonical (fname, buf, buflen);
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xfree (buf);
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return key;
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}
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static void
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read_and_protect (const char *fname)
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{
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int rc;
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unsigned char *key;
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unsigned char *result;
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size_t resultlen;
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char *pw;
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key = read_key (fname);
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if (!key)
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return;
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pw = get_passphrase (1, 0);
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rc = agent_protect (key, pw, &result, &resultlen);
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release_passphrase (pw);
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xfree (key);
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if (rc)
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{
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log_error ("protecting the key failed: %s\n", gpg_strerror (rc));
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return;
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}
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if (opt_armor)
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{
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char *p = make_advanced (result, resultlen);
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xfree (result);
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if (!p)
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return;
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result = (unsigned char*)p;
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resultlen = strlen (p);
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}
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fwrite (result, resultlen, 1, stdout);
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xfree (result);
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}
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static void
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read_and_unprotect (const char *fname)
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{
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int rc;
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unsigned char *key;
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unsigned char *result;
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size_t resultlen;
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char *pw;
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key = read_key (fname);
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if (!key)
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return;
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rc = agent_unprotect (key, (pw=get_passphrase (1, 0)), &result, &resultlen);
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release_passphrase (pw);
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xfree (key);
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if (rc)
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{
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if (opt_status_msg)
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log_info ("[PROTECT-TOOL:] bad-passphrase\n");
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log_error ("unprotecting the key failed: %s\n", gpg_strerror (rc));
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return;
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}
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if (opt_armor)
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{
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char *p = make_advanced (result, resultlen);
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xfree (result);
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if (!p)
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return;
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result = (unsigned char*)p;
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resultlen = strlen (p);
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}
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fwrite (result, resultlen, 1, stdout);
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xfree (result);
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}
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static void
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read_and_shadow (const char *fname)
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{
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int rc;
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unsigned char *key;
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unsigned char *result;
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size_t resultlen;
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unsigned char dummy_info[] = "(8:313233342:43)";
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key = read_key (fname);
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if (!key)
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return;
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rc = agent_shadow_key (key, dummy_info, &result);
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xfree (key);
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if (rc)
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{
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log_error ("shadowing the key failed: %s\n", gpg_strerror (rc));
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return;
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}
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resultlen = gcry_sexp_canon_len (result, 0, NULL,NULL);
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assert (resultlen);
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if (opt_armor)
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{
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char *p = make_advanced (result, resultlen);
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xfree (result);
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if (!p)
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return;
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result = (unsigned char*)p;
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resultlen = strlen (p);
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}
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fwrite (result, resultlen, 1, stdout);
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xfree (result);
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}
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static void
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show_shadow_info (const char *fname)
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{
|
||
int rc;
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unsigned char *key;
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const unsigned char *info;
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size_t infolen;
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key = read_key (fname);
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if (!key)
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return;
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rc = agent_get_shadow_info (key, &info);
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xfree (key);
|
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if (rc)
|
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{
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log_error ("get_shadow_info failed: %s\n", gpg_strerror (rc));
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return;
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}
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infolen = gcry_sexp_canon_len (info, 0, NULL,NULL);
|
||
assert (infolen);
|
||
|
||
if (opt_armor)
|
||
{
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char *p = make_advanced (info, infolen);
|
||
if (!p)
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||
return;
|
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fwrite (p, strlen (p), 1, stdout);
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xfree (p);
|
||
}
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else
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fwrite (info, infolen, 1, stdout);
|
||
}
|
||
|
||
|
||
static void
|
||
show_file (const char *fname)
|
||
{
|
||
unsigned char *key;
|
||
size_t keylen;
|
||
char *p;
|
||
|
||
key = read_key (fname);
|
||
if (!key)
|
||
return;
|
||
|
||
keylen = gcry_sexp_canon_len (key, 0, NULL,NULL);
|
||
assert (keylen);
|
||
|
||
if (opt_canonical)
|
||
{
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||
fwrite (key, keylen, 1, stdout);
|
||
}
|
||
else
|
||
{
|
||
p = make_advanced (key, keylen);
|
||
if (p)
|
||
{
|
||
fwrite (p, strlen (p), 1, stdout);
|
||
xfree (p);
|
||
}
|
||
}
|
||
xfree (key);
|
||
}
|
||
|
||
static void
|
||
show_keygrip (const char *fname)
|
||
{
|
||
unsigned char *key;
|
||
gcry_sexp_t private;
|
||
unsigned char grip[20];
|
||
int i;
|
||
|
||
key = read_key (fname);
|
||
if (!key)
|
||
return;
|
||
|
||
if (gcry_sexp_new (&private, key, 0, 0))
|
||
{
|
||
log_error ("gcry_sexp_new failed\n");
|
||
return;
|
||
}
|
||
xfree (key);
|
||
|
||
if (!gcry_pk_get_keygrip (private, grip))
|
||
{
|
||
log_error ("can't calculate keygrip\n");
|
||
return;
|
||
}
|
||
gcry_sexp_release (private);
|
||
|
||
for (i=0; i < 20; i++)
|
||
printf ("%02X", grip[i]);
|
||
putchar ('\n');
|
||
}
|
||
|
||
|
||
static int
|
||
rsa_key_check (struct rsa_secret_key_s *skey)
|
||
{
|
||
int err = 0;
|
||
gcry_mpi_t t = gcry_mpi_snew (0);
|
||
gcry_mpi_t t1 = gcry_mpi_snew (0);
|
||
gcry_mpi_t t2 = gcry_mpi_snew (0);
|
||
gcry_mpi_t phi = gcry_mpi_snew (0);
|
||
|
||
/* check that n == p * q */
|
||
gcry_mpi_mul (t, skey->p, skey->q);
|
||
if (gcry_mpi_cmp( t, skey->n) )
|
||
{
|
||
log_error ("RSA oops: n != p * q\n");
|
||
err++;
|
||
}
|
||
|
||
/* check that p is less than q */
|
||
if (gcry_mpi_cmp (skey->p, skey->q) > 0)
|
||
{
|
||
gcry_mpi_t tmp;
|
||
|
||
log_info ("swapping secret primes\n");
|
||
tmp = gcry_mpi_copy (skey->p);
|
||
gcry_mpi_set (skey->p, skey->q);
|
||
gcry_mpi_set (skey->q, tmp);
|
||
gcry_mpi_release (tmp);
|
||
/* and must recompute u of course */
|
||
gcry_mpi_invm (skey->u, skey->p, skey->q);
|
||
}
|
||
|
||
/* check that e divides neither p-1 nor q-1 */
|
||
gcry_mpi_sub_ui (t, skey->p, 1 );
|
||
gcry_mpi_div (NULL, t, t, skey->e, 0);
|
||
if (!gcry_mpi_cmp_ui( t, 0) )
|
||
{
|
||
log_error ("RSA oops: e divides p-1\n");
|
||
err++;
|
||
}
|
||
gcry_mpi_sub_ui (t, skey->q, 1);
|
||
gcry_mpi_div (NULL, t, t, skey->e, 0);
|
||
if (!gcry_mpi_cmp_ui( t, 0))
|
||
{
|
||
log_info ( "RSA oops: e divides q-1\n" );
|
||
err++;
|
||
}
|
||
|
||
/* check that d is correct. */
|
||
gcry_mpi_sub_ui (t1, skey->p, 1);
|
||
gcry_mpi_sub_ui (t2, skey->q, 1);
|
||
gcry_mpi_mul (phi, t1, t2);
|
||
gcry_mpi_invm (t, skey->e, phi);
|
||
if (gcry_mpi_cmp (t, skey->d))
|
||
{ /* no: try universal exponent. */
|
||
gcry_mpi_gcd (t, t1, t2);
|
||
gcry_mpi_div (t, NULL, phi, t, 0);
|
||
gcry_mpi_invm (t, skey->e, t);
|
||
if (gcry_mpi_cmp (t, skey->d))
|
||
{
|
||
log_error ("RSA oops: bad secret exponent\n");
|
||
err++;
|
||
}
|
||
}
|
||
|
||
/* check for correctness of u */
|
||
gcry_mpi_invm (t, skey->p, skey->q);
|
||
if (gcry_mpi_cmp (t, skey->u))
|
||
{
|
||
log_info ( "RSA oops: bad u parameter\n");
|
||
err++;
|
||
}
|
||
|
||
if (err)
|
||
log_info ("RSA secret key check failed\n");
|
||
|
||
gcry_mpi_release (t);
|
||
gcry_mpi_release (t1);
|
||
gcry_mpi_release (t2);
|
||
gcry_mpi_release (phi);
|
||
|
||
return err? -1:0;
|
||
}
|
||
|
||
|
||
/* A callback used by p12_parse to return a certificate. */
|
||
static void
|
||
import_p12_cert_cb (void *opaque, const unsigned char *cert, size_t certlen)
|
||
{
|
||
struct b64state state;
|
||
gpg_error_t err, err2;
|
||
|
||
err = b64enc_start (&state, stdout, "CERTIFICATE");
|
||
if (!err)
|
||
err = b64enc_write (&state, cert, certlen);
|
||
err2 = b64enc_finish (&state);
|
||
if (!err)
|
||
err = err2;
|
||
if (err)
|
||
log_error ("error writing armored certificate: %s\n", gpg_strerror (err));
|
||
}
|
||
|
||
static void
|
||
import_p12_file (const char *fname)
|
||
{
|
||
char *buf;
|
||
unsigned char *result;
|
||
size_t buflen, resultlen;
|
||
int i;
|
||
int rc;
|
||
gcry_mpi_t *kparms;
|
||
struct rsa_secret_key_s sk;
|
||
gcry_sexp_t s_key;
|
||
unsigned char *key;
|
||
unsigned char grip[20];
|
||
char *pw;
|
||
|
||
/* fixme: we should release some stuff on error */
|
||
|
||
buf = read_file (fname, &buflen);
|
||
if (!buf)
|
||
return;
|
||
|
||
kparms = p12_parse ((unsigned char*)buf, buflen, (pw=get_passphrase (2, 0)),
|
||
import_p12_cert_cb, NULL);
|
||
release_passphrase (pw);
|
||
xfree (buf);
|
||
if (!kparms)
|
||
{
|
||
log_error ("error parsing or decrypting the PKCS-12 file\n");
|
||
return;
|
||
}
|
||
for (i=0; kparms[i]; i++)
|
||
;
|
||
if (i != 8)
|
||
{
|
||
log_error ("invalid structure of private key\n");
|
||
return;
|
||
}
|
||
|
||
|
||
/* print_mpi (" n", kparms[0]); */
|
||
/* print_mpi (" e", kparms[1]); */
|
||
/* print_mpi (" d", kparms[2]); */
|
||
/* print_mpi (" p", kparms[3]); */
|
||
/* print_mpi (" q", kparms[4]); */
|
||
/* print_mpi ("dmp1", kparms[5]); */
|
||
/* print_mpi ("dmq1", kparms[6]); */
|
||
/* print_mpi (" u", kparms[7]); */
|
||
|
||
sk.n = kparms[0];
|
||
sk.e = kparms[1];
|
||
sk.d = kparms[2];
|
||
sk.q = kparms[3];
|
||
sk.p = kparms[4];
|
||
sk.u = kparms[7];
|
||
if (rsa_key_check (&sk))
|
||
return;
|
||
/* print_mpi (" n", sk.n); */
|
||
/* print_mpi (" e", sk.e); */
|
||
/* print_mpi (" d", sk.d); */
|
||
/* print_mpi (" p", sk.p); */
|
||
/* print_mpi (" q", sk.q); */
|
||
/* print_mpi (" u", sk.u); */
|
||
|
||
/* Create an S-expresion from the parameters. */
|
||
rc = gcry_sexp_build (&s_key, NULL,
|
||
"(private-key(rsa(n%m)(e%m)(d%m)(p%m)(q%m)(u%m)))",
|
||
sk.n, sk.e, sk.d, sk.p, sk.q, sk.u, NULL);
|
||
for (i=0; i < 8; i++)
|
||
gcry_mpi_release (kparms[i]);
|
||
gcry_free (kparms);
|
||
if (rc)
|
||
{
|
||
log_error ("failed to created S-expression from key: %s\n",
|
||
gpg_strerror (rc));
|
||
return;
|
||
}
|
||
|
||
/* Compute the keygrip. */
|
||
if (!gcry_pk_get_keygrip (s_key, grip))
|
||
{
|
||
log_error ("can't calculate keygrip\n");
|
||
return;
|
||
}
|
||
log_info ("keygrip: ");
|
||
for (i=0; i < 20; i++)
|
||
log_printf ("%02X", grip[i]);
|
||
log_printf ("\n");
|
||
|
||
/* Convert to canonical encoding. */
|
||
buflen = gcry_sexp_sprint (s_key, GCRYSEXP_FMT_CANON, NULL, 0);
|
||
assert (buflen);
|
||
key = gcry_xmalloc_secure (buflen);
|
||
buflen = gcry_sexp_sprint (s_key, GCRYSEXP_FMT_CANON, key, buflen);
|
||
assert (buflen);
|
||
gcry_sexp_release (s_key);
|
||
|
||
|
||
rc = agent_protect (key, (pw=get_new_passphrase (4)), &result, &resultlen);
|
||
release_passphrase (pw);
|
||
xfree (key);
|
||
if (rc)
|
||
{
|
||
log_error ("protecting the key failed: %s\n", gpg_strerror (rc));
|
||
return;
|
||
}
|
||
|
||
if (opt_armor)
|
||
{
|
||
char *p = make_advanced (result, resultlen);
|
||
xfree (result);
|
||
if (!p)
|
||
return;
|
||
result = (unsigned char*)p;
|
||
resultlen = strlen (p);
|
||
}
|
||
|
||
if (opt_store)
|
||
store_private_key (grip, result, resultlen, opt_force);
|
||
else
|
||
fwrite (result, resultlen, 1, stdout);
|
||
|
||
xfree (result);
|
||
}
|
||
|
||
|
||
|
||
static gcry_mpi_t *
|
||
sexp_to_kparms (gcry_sexp_t sexp)
|
||
{
|
||
gcry_sexp_t list, l2;
|
||
const char *name;
|
||
const char *s;
|
||
size_t n;
|
||
int i, idx;
|
||
const char *elems;
|
||
gcry_mpi_t *array;
|
||
|
||
list = gcry_sexp_find_token (sexp, "private-key", 0 );
|
||
if(!list)
|
||
return NULL;
|
||
l2 = gcry_sexp_cadr (list);
|
||
gcry_sexp_release (list);
|
||
list = l2;
|
||
name = gcry_sexp_nth_data (list, 0, &n);
|
||
if(!name || n != 3 || memcmp (name, "rsa", 3))
|
||
{
|
||
gcry_sexp_release (list);
|
||
return NULL;
|
||
}
|
||
|
||
/* Parameter names used with RSA. */
|
||
elems = "nedpqu";
|
||
array = xcalloc (strlen(elems) + 1, sizeof *array);
|
||
for (idx=0, s=elems; *s; s++, idx++ )
|
||
{
|
||
l2 = gcry_sexp_find_token (list, s, 1);
|
||
if (!l2)
|
||
{
|
||
for (i=0; i<idx; i++)
|
||
gcry_mpi_release (array[i]);
|
||
xfree (array);
|
||
gcry_sexp_release (list);
|
||
return NULL; /* required parameter not found */
|
||
}
|
||
array[idx] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG);
|
||
gcry_sexp_release (l2);
|
||
if (!array[idx])
|
||
{
|
||
for (i=0; i<idx; i++)
|
||
gcry_mpi_release (array[i]);
|
||
xfree (array);
|
||
gcry_sexp_release (list);
|
||
return NULL; /* required parameter is invalid */
|
||
}
|
||
}
|
||
|
||
gcry_sexp_release (list);
|
||
return array;
|
||
}
|
||
|
||
|
||
/* Check whether STRING is a KEYGRIP, i.e has the correct length and
|
||
does only consist of uppercase hex characters. */
|
||
static int
|
||
is_keygrip (const char *string)
|
||
{
|
||
int i;
|
||
|
||
for(i=0; string[i] && i < 41; i++)
|
||
if (!strchr("01234567890ABCDEF", string[i]))
|
||
return 0;
|
||
return i == 40;
|
||
}
|
||
|
||
|
||
static void
|
||
export_p12_file (const char *fname)
|
||
{
|
||
int rc;
|
||
gcry_mpi_t kparms[9], *kp;
|
||
unsigned char *key;
|
||
size_t keylen;
|
||
gcry_sexp_t private;
|
||
struct rsa_secret_key_s sk;
|
||
int i;
|
||
unsigned char *cert = NULL;
|
||
size_t certlen = 0;
|
||
int keytype;
|
||
size_t keylen_for_wipe = 0;
|
||
char *pw;
|
||
|
||
if ( is_keygrip (fname) )
|
||
{
|
||
char hexgrip[40+4+1];
|
||
char *p;
|
||
|
||
assert (strlen(fname) == 40);
|
||
strcpy (stpcpy (hexgrip, fname), ".key");
|
||
|
||
p = make_filename (opt_homedir, GNUPG_PRIVATE_KEYS_DIR, hexgrip, NULL);
|
||
key = read_key (p);
|
||
xfree (p);
|
||
}
|
||
else
|
||
key = read_key (fname);
|
||
|
||
if (!key)
|
||
return;
|
||
|
||
keytype = agent_private_key_type (key);
|
||
if (keytype == PRIVATE_KEY_PROTECTED)
|
||
{
|
||
unsigned char *tmpkey;
|
||
size_t tmplen;
|
||
|
||
rc = agent_unprotect (key, (pw=get_passphrase (1, 0)), &tmpkey, &tmplen);
|
||
release_passphrase (pw);
|
||
if (rc)
|
||
{
|
||
if (opt_status_msg && gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE )
|
||
log_info ("[PROTECT-TOOL:] bad-passphrase\n");
|
||
log_error ("unprotecting key `%s' failed: %s\n",
|
||
fname, gpg_strerror (rc));
|
||
xfree (key);
|
||
return;
|
||
}
|
||
xfree (key);
|
||
key = tmpkey;
|
||
keylen_for_wipe = tmplen;
|
||
|
||
keytype = agent_private_key_type (key);
|
||
}
|
||
|
||
if (keytype == PRIVATE_KEY_SHADOWED)
|
||
{
|
||
log_error ("`%s' is a shadowed private key - can't export it\n", fname);
|
||
wipememory (key, keylen_for_wipe);
|
||
xfree (key);
|
||
return;
|
||
}
|
||
else if (keytype != PRIVATE_KEY_CLEAR)
|
||
{
|
||
log_error ("\%s' is not a private key\n", fname);
|
||
wipememory (key, keylen_for_wipe);
|
||
xfree (key);
|
||
return;
|
||
}
|
||
|
||
|
||
if (opt_have_cert)
|
||
{
|
||
cert = (unsigned char*)read_file ("-", &certlen);
|
||
if (!cert)
|
||
{
|
||
wipememory (key, keylen_for_wipe);
|
||
xfree (key);
|
||
return;
|
||
}
|
||
}
|
||
|
||
|
||
if (gcry_sexp_new (&private, key, 0, 0))
|
||
{
|
||
log_error ("gcry_sexp_new failed\n");
|
||
wipememory (key, keylen_for_wipe);
|
||
xfree (key);
|
||
xfree (cert);
|
||
return;
|
||
}
|
||
wipememory (key, keylen_for_wipe);
|
||
xfree (key);
|
||
|
||
kp = sexp_to_kparms (private);
|
||
gcry_sexp_release (private);
|
||
if (!kp)
|
||
{
|
||
log_error ("error converting key parameters\n");
|
||
xfree (cert);
|
||
return;
|
||
}
|
||
sk.n = kp[0];
|
||
sk.e = kp[1];
|
||
sk.d = kp[2];
|
||
sk.p = kp[3];
|
||
sk.q = kp[4];
|
||
sk.u = kp[5];
|
||
xfree (kp);
|
||
|
||
|
||
kparms[0] = sk.n;
|
||
kparms[1] = sk.e;
|
||
kparms[2] = sk.d;
|
||
kparms[3] = sk.q;
|
||
kparms[4] = sk.p;
|
||
kparms[5] = gcry_mpi_snew (0); /* compute d mod (p-1) */
|
||
gcry_mpi_sub_ui (kparms[5], kparms[3], 1);
|
||
gcry_mpi_mod (kparms[5], sk.d, kparms[5]);
|
||
kparms[6] = gcry_mpi_snew (0); /* compute d mod (q-1) */
|
||
gcry_mpi_sub_ui (kparms[6], kparms[4], 1);
|
||
gcry_mpi_mod (kparms[6], sk.d, kparms[6]);
|
||
kparms[7] = sk.u;
|
||
kparms[8] = NULL;
|
||
|
||
key = p12_build (kparms, cert, certlen,
|
||
(pw=get_new_passphrase (3)), opt_p12_charset, &keylen);
|
||
release_passphrase (pw);
|
||
xfree (cert);
|
||
for (i=0; i < 8; i++)
|
||
gcry_mpi_release (kparms[i]);
|
||
if (!key)
|
||
return;
|
||
|
||
#ifdef HAVE_DOSISH_SYSTEM
|
||
setmode ( fileno (stdout) , O_BINARY );
|
||
#endif
|
||
fwrite (key, keylen, 1, stdout);
|
||
xfree (key);
|
||
}
|
||
|
||
|
||
|
||
/* Do the percent and plus/space unescaping in place and return the
|
||
length of the valid buffer. */
|
||
static size_t
|
||
percent_plus_unescape (unsigned char *string)
|
||
{
|
||
unsigned char *p = string;
|
||
size_t n = 0;
|
||
|
||
while (*string)
|
||
{
|
||
if (*string == '%' && string[1] && string[2])
|
||
{
|
||
string++;
|
||
*p++ = xtoi_2 (string);
|
||
n++;
|
||
string+= 2;
|
||
}
|
||
else if (*string == '+')
|
||
{
|
||
*p++ = ' ';
|
||
n++;
|
||
string++;
|
||
}
|
||
else
|
||
{
|
||
*p++ = *string++;
|
||
n++;
|
||
}
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
/* Remove percent and plus escaping and make sure that the reuslt is a
|
||
string. This is done in place. Returns STRING. */
|
||
static char *
|
||
percent_plus_unescape_string (char *string)
|
||
{
|
||
unsigned char *p = (unsigned char*)string;
|
||
size_t n;
|
||
|
||
n = percent_plus_unescape (p);
|
||
p[n] = 0;
|
||
|
||
return string;
|
||
}
|
||
|
||
|
||
int
|
||
main (int argc, char **argv )
|
||
{
|
||
ARGPARSE_ARGS pargs;
|
||
int cmd = 0;
|
||
const char *fname;
|
||
|
||
set_strusage (my_strusage);
|
||
gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
|
||
log_set_prefix ("gpg-protect-tool", 1);
|
||
|
||
/* Try to auto set the character set. */
|
||
set_native_charset (NULL);
|
||
|
||
i18n_init ();
|
||
|
||
if (!gcry_check_version (NEED_LIBGCRYPT_VERSION) )
|
||
{
|
||
log_fatal( _("%s is too old (need %s, have %s)\n"), "libgcrypt",
|
||
NEED_LIBGCRYPT_VERSION, gcry_check_version (NULL) );
|
||
}
|
||
|
||
setup_libgcrypt_logging ();
|
||
gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
|
||
|
||
|
||
opt_homedir = default_homedir ();
|
||
|
||
|
||
pargs.argc = &argc;
|
||
pargs.argv = &argv;
|
||
pargs.flags= 1; /* (do not remove the args) */
|
||
while (arg_parse (&pargs, opts) )
|
||
{
|
||
switch (pargs.r_opt)
|
||
{
|
||
case oVerbose: opt.verbose++; break;
|
||
case oArmor: opt_armor=1; break;
|
||
case oCanonical: opt_canonical=1; break;
|
||
case oHomedir: opt_homedir = pargs.r.ret_str; break;
|
||
|
||
case oProtect: cmd = oProtect; break;
|
||
case oUnprotect: cmd = oUnprotect; break;
|
||
case oShadow: cmd = oShadow; break;
|
||
case oShowShadowInfo: cmd = oShowShadowInfo; break;
|
||
case oShowKeygrip: cmd = oShowKeygrip; break;
|
||
case oP12Import: cmd = oP12Import; break;
|
||
case oP12Export: cmd = oP12Export; break;
|
||
case oP12Charset: opt_p12_charset = pargs.r.ret_str; break;
|
||
|
||
case oPassphrase: opt_passphrase = pargs.r.ret_str; break;
|
||
case oStore: opt_store = 1; break;
|
||
case oForce: opt_force = 1; break;
|
||
case oNoFailOnExist: opt_no_fail_on_exist = 1; break;
|
||
case oHaveCert: opt_have_cert = 1; break;
|
||
case oPrompt: opt_prompt = pargs.r.ret_str; break;
|
||
case oStatusMsg: opt_status_msg = 1; break;
|
||
|
||
default : pargs.err = 2; break;
|
||
}
|
||
}
|
||
if (log_get_errorcount(0))
|
||
exit(2);
|
||
|
||
fname = "-";
|
||
if (argc == 1)
|
||
fname = *argv;
|
||
else if (argc > 1)
|
||
usage (1);
|
||
|
||
if (opt_prompt)
|
||
opt_prompt = percent_plus_unescape_string (xstrdup (opt_prompt));
|
||
|
||
if (cmd == oProtect)
|
||
read_and_protect (fname);
|
||
else if (cmd == oUnprotect)
|
||
read_and_unprotect (fname);
|
||
else if (cmd == oShadow)
|
||
read_and_shadow (fname);
|
||
else if (cmd == oShowShadowInfo)
|
||
show_shadow_info (fname);
|
||
else if (cmd == oShowKeygrip)
|
||
show_keygrip (fname);
|
||
else if (cmd == oP12Import)
|
||
import_p12_file (fname);
|
||
else if (cmd == oP12Export)
|
||
export_p12_file (fname);
|
||
else
|
||
show_file (fname);
|
||
|
||
agent_exit (0);
|
||
return 8; /*NOTREACHED*/
|
||
}
|
||
|
||
void
|
||
agent_exit (int rc)
|
||
{
|
||
rc = rc? rc : log_get_errorcount(0)? 2 : 0;
|
||
exit (rc);
|
||
}
|
||
|
||
|
||
/* Return the passphrase string and ask the agent if it has not been
|
||
set from the command line PROMPTNO select the prompt to display:
|
||
0 = default
|
||
1 = taken from the option --prompt
|
||
2 = for unprotecting a pkcs#12 object
|
||
3 = for protecting a new pkcs#12 object
|
||
4 = for protecting an imported pkcs#12 in our system
|
||
5 = reenter the passphrase
|
||
When adding 100 to the values, a "does not match - try again" error
|
||
message is shown.
|
||
*/
|
||
static char *
|
||
get_passphrase (int promptno, int opt_check)
|
||
{
|
||
char *pw;
|
||
int err;
|
||
const char *desc;
|
||
#ifdef ENABLE_NLS
|
||
char *orig_codeset = NULL;
|
||
#endif
|
||
int error_msgno;
|
||
|
||
|
||
if (opt_passphrase)
|
||
return xstrdup (opt_passphrase);
|
||
|
||
error_msgno = promptno / 100;
|
||
promptno %= 100;
|
||
|
||
#ifdef ENABLE_NLS
|
||
/* The Assuan agent protocol requires us to transmit utf-8 strings */
|
||
orig_codeset = bind_textdomain_codeset (PACKAGE_GT, NULL);
|
||
#ifdef HAVE_LANGINFO_CODESET
|
||
if (!orig_codeset)
|
||
orig_codeset = nl_langinfo (CODESET);
|
||
#endif
|
||
if (orig_codeset && !strcmp (orig_codeset, "UTF-8"))
|
||
orig_codeset = NULL;
|
||
if (orig_codeset)
|
||
{
|
||
/* We only switch when we are able to restore the codeset later. */
|
||
orig_codeset = xstrdup (orig_codeset);
|
||
if (!bind_textdomain_codeset (PACKAGE_GT, "utf-8"))
|
||
{
|
||
xfree (orig_codeset);
|
||
orig_codeset = NULL;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
if (promptno == 1 && opt_prompt)
|
||
desc = opt_prompt;
|
||
else if (promptno == 2)
|
||
desc = _("Please enter the passphrase to unprotect the "
|
||
"PKCS#12 object.");
|
||
else if (promptno == 3)
|
||
desc = _("Please enter the passphrase to protect the "
|
||
"new PKCS#12 object.");
|
||
else if (promptno == 4)
|
||
desc = _("Please enter the passphrase to protect the "
|
||
"imported object within the GnuPG system.");
|
||
else if (promptno == 5)
|
||
desc = _("Please re-enter this passphrase");
|
||
else
|
||
desc = _("Please enter the passphrase or the PIN\n"
|
||
"needed to complete this operation.");
|
||
|
||
pw = simple_pwquery (NULL,
|
||
error_msgno == 1? _("does not match - try again"):NULL,
|
||
_("Passphrase:"), desc, opt_check, &err);
|
||
|
||
#ifdef ENABLE_NLS
|
||
if (orig_codeset)
|
||
{
|
||
bind_textdomain_codeset (PACKAGE_GT, orig_codeset);
|
||
xfree (orig_codeset);
|
||
}
|
||
#endif
|
||
|
||
if (!pw)
|
||
{
|
||
if (err)
|
||
log_error (_("error while asking for the passphrase: %s\n"),
|
||
gpg_strerror (err));
|
||
else
|
||
log_info (_("cancelled\n"));
|
||
agent_exit (0);
|
||
}
|
||
|
||
return pw;
|
||
}
|
||
|
||
|
||
/* Same as get_passphrase but requests it a second time and compares
|
||
it to the one entered the first time. */
|
||
static char *
|
||
get_new_passphrase (int promptno)
|
||
{
|
||
char *pw;
|
||
int i, secondpromptno;
|
||
|
||
pw = get_passphrase (promptno, 1);
|
||
if (!pw)
|
||
return NULL; /* Canceled. */
|
||
if (!*pw)
|
||
return pw; /* Empty passphrase - no need to ask for repeating it. */
|
||
|
||
secondpromptno = 5;
|
||
for (i=0; i < 3; i++)
|
||
{
|
||
char *pw2 = get_passphrase (secondpromptno, 0);
|
||
if (!pw2)
|
||
{
|
||
xfree (pw);
|
||
return NULL; /* Canceled. */
|
||
}
|
||
if (!strcmp (pw, pw2))
|
||
{
|
||
xfree (pw2);
|
||
return pw; /* Okay. */
|
||
}
|
||
secondpromptno = 105;
|
||
xfree (pw2);
|
||
}
|
||
xfree (pw);
|
||
return NULL; /* 3 times repeated wrong - cancel. */
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
release_passphrase (char *pw)
|
||
{
|
||
if (pw)
|
||
{
|
||
wipememory (pw, strlen (pw));
|
||
xfree (pw);
|
||
}
|
||
}
|
||
|
||
static int
|
||
store_private_key (const unsigned char *grip,
|
||
const void *buffer, size_t length, int force)
|
||
{
|
||
int i;
|
||
char *fname;
|
||
FILE *fp;
|
||
char hexgrip[40+4+1];
|
||
|
||
for (i=0; i < 20; i++)
|
||
sprintf (hexgrip+2*i, "%02X", grip[i]);
|
||
strcpy (hexgrip+40, ".key");
|
||
|
||
fname = make_filename (opt_homedir, GNUPG_PRIVATE_KEYS_DIR, hexgrip, NULL);
|
||
if (force)
|
||
fp = fopen (fname, "wb");
|
||
else
|
||
{
|
||
if (!access (fname, F_OK))
|
||
{
|
||
if (opt_status_msg)
|
||
log_info ("[PROTECT-TOOL:] secretkey-exists\n");
|
||
if (opt_no_fail_on_exist)
|
||
log_info ("secret key file `%s' already exists\n", fname);
|
||
else
|
||
log_error ("secret key file `%s' already exists\n", fname);
|
||
xfree (fname);
|
||
return opt_no_fail_on_exist? 0 : -1;
|
||
}
|
||
fp = fopen (fname, "wbx"); /* FIXME: the x is a GNU extension - let
|
||
configure check whether this actually
|
||
works */
|
||
}
|
||
|
||
if (!fp)
|
||
{
|
||
log_error ("can't create `%s': %s\n", fname, strerror (errno));
|
||
xfree (fname);
|
||
return -1;
|
||
}
|
||
|
||
if (fwrite (buffer, length, 1, fp) != 1)
|
||
{
|
||
log_error ("error writing `%s': %s\n", fname, strerror (errno));
|
||
fclose (fp);
|
||
remove (fname);
|
||
xfree (fname);
|
||
return -1;
|
||
}
|
||
if ( fclose (fp) )
|
||
{
|
||
log_error ("error closing `%s': %s\n", fname, strerror (errno));
|
||
remove (fname);
|
||
xfree (fname);
|
||
return -1;
|
||
}
|
||
log_info ("secret key stored as `%s'\n", fname);
|
||
|
||
if (opt_status_msg)
|
||
log_info ("[PROTECT-TOOL:] secretkey-stored\n");
|
||
|
||
xfree (fname);
|
||
return 0;
|
||
}
|