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gpgsm: New commands --export-secret-key-{p8,raw}

Browse Source 
* sm/gpgsm.c: Add new commands.
* sm/minip12.c (build_key_sequence): Add arg mode.
(p12_raw_build): New.
* sm/export.c (export_p12): Add arg rawmode.  Call p12_raw_build.
(gpgsm_p12_export): Ditto.
(print_short_info): Print the keygrip.
This commit is contained in:
Werner Koch 2014-06-03 18:57:33 +02:00
parent 50cd3d40ae
commit 0beec2f0f2
7 changed files with 184 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
NEWS
View File

@ -42,6 +42,9 @@ Noteworthy changes in version 2.1.0-betaN (unreleased)
* Protect against rogue keyservers sending secret keys.
* GPGSM can now be used to export a secret RSA key in PKCS#1 or
PKCS#8 format.
Noteworthy changes in version 2.1.0beta3 (2011-12-20)
-----------------------------------------------------

17
doc/gpgsm.texi
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@ -259,13 +259,26 @@ certificate are only exported if all @var{pattern} are given as
fingerprints or keygrips.
@item --export-secret-key-p12 @var{key-id}
@opindex export
@opindex export-secret-key-p12
Export the private key and the certificate identified by @var{key-id} in
a PKCS#12 format. When using along with the @code{--armor} option a few
a PKCS#12 format. When used with the @code{--armor} option a few
informational lines are prepended to the output. Note, that the PKCS#12
format is not very secure and this command is only provided if there is
no other way to exchange the private key. (@pxref{option --p12-charset})
@ifset gpgtwoone
@item --export-secret-key-p8 @var{key-id}
@itemx --export-secret-key-raw @var{key-id}
@opindex export-secret-key-p8
@opindex export-secret-key-raw
Export the private key of the certificate identified by @var{key-id}
with any encryption stripped. The @code{...-raw} command exports in
PKCS#1 format; the @code{...-p8} command exports in PKCS#8 format.
When used with the @code{--armor} option a few informational lines are
prepended to the output. These commands are useful to prepare a key
for use on a TLS server.
@end ifset
@item --import [@var{files}]
@opindex import
Import the certificates from the PEM or binary encoded files as well as

71
sm/export.c
View File

@ -60,6 +60,7 @@ static void print_short_info (ksba_cert_t cert, estream_t stream);
static gpg_error_t export_p12 (ctrl_t ctrl,
const unsigned char *certimg, size_t certimglen,
const char *prompt, const char *keygrip,
int rawmode,
void **r_result, size_t *r_resultlen);
@ -315,9 +316,14 @@ gpgsm_export (ctrl_t ctrl, strlist_t names, estream_t stream)
}
/* Export a certificate and its private key. */
/* Export a certificate and its private key. RAWMODE controls the
actual output:
0 - Private key and certifciate in PKCS#12 format
1 - Only unencrypted private key in PKCS#8 format
2 - Only unencrypted private key in PKCS#1 format
*/
void
gpgsm_p12_export (ctrl_t ctrl, const char *name, estream_t stream)
gpgsm_p12_export (ctrl_t ctrl, const char *name, estream_t stream, int rawmode)
{
gpg_error_t err = 0;
KEYDB_HANDLE hd;
@ -416,13 +422,18 @@ gpgsm_p12_export (ctrl_t ctrl, const char *name, estream_t stream)
es_putc ('\n', stream);
}
if (opt.p12_charset && ctrl->create_pem)
if (opt.p12_charset && ctrl->create_pem && !rawmode)
{
es_fprintf (stream, "The passphrase is %s encoded.\n\n",
opt.p12_charset);
}
ctrl->pem_name = "PKCS12";
if (rawmode == 0)
ctrl->pem_name = "PKCS12";
else if (rawmode == 1)
ctrl->pem_name = "PRIVATE KEY";
else
ctrl->pem_name = "RSA PRIVATE KEY";
err = gpgsm_create_writer (&b64writer, ctrl, stream, &writer);
if (err)
{
@ -431,7 +442,8 @@ gpgsm_p12_export (ctrl_t ctrl, const char *name, estream_t stream)
}
prompt = gpgsm_format_keydesc (cert);
err = export_p12 (ctrl, image, imagelen, prompt, keygrip, &data, &datalen);
err = export_p12 (ctrl, image, imagelen, prompt, keygrip, rawmode,
&data, &datalen);
xfree (prompt);
if (err)
goto leave;
@ -513,12 +525,19 @@ print_short_info (ksba_cert_t cert, estream_t stream)
xfree (p);
}
es_putc ('\n', stream);
p = gpgsm_get_keygrip_hexstring (cert);
if (p)
{
es_fprintf (stream, "Keygrip ..: %s\n", p);
xfree (p);
}
}
/* Parse a private key S-expression and retutn a malloced array with
the RSA paramaters in pkcs#12 order. The caller needs to
/* Parse a private key S-expression and return a malloced array with
the RSA parameters in pkcs#12 order. The caller needs to
deep-release this array. */
static gcry_mpi_t *
sexp_to_kparms (gcry_sexp_t sexp)
@ -587,7 +606,7 @@ sexp_to_kparms (gcry_sexp_t sexp)
static gpg_error_t
export_p12 (ctrl_t ctrl, const unsigned char *certimg, size_t certimglen,
const char *prompt, const char *keygrip,
const char *prompt, const char *keygrip, int rawmode,
void **r_result, size_t *r_resultlen)
{
gpg_error_t err = 0;
@ -671,20 +690,30 @@ export_p12 (ctrl_t ctrl, const unsigned char *certimg, size_t certimglen,
goto leave;
}
err = gpgsm_agent_ask_passphrase
(ctrl,
i18n_utf8 ("Please enter the passphrase to protect the "
"new PKCS#12 object."),
1, &passphrase);
if (err)
goto leave;
if (rawmode)
{
/* Export in raw mode, that is only the pkcs#1/#8 private key. */
result = p12_raw_build (kparms, rawmode, &resultlen);
if (!result)
err = gpg_error (GPG_ERR_GENERAL);
}
else
{
err = gpgsm_agent_ask_passphrase
(ctrl,
i18n_utf8 ("Please enter the passphrase to protect the "
"new PKCS#12 object."),
1, &passphrase);
if (err)
goto leave;
result = p12_build (kparms, certimg, certimglen, passphrase,
opt.p12_charset, &resultlen);
xfree (passphrase);
passphrase = NULL;
if (!result)
err = gpg_error (GPG_ERR_GENERAL);
result = p12_build (kparms, certimg, certimglen, passphrase,
opt.p12_charset, &resultlen);
xfree (passphrase);
passphrase = NULL;
if (!result)
err = gpg_error (GPG_ERR_GENERAL);
}
leave:
xfree (key);

38
sm/gpgsm.c
View File

@ -74,6 +74,8 @@ enum cmd_and_opt_values {
aRecvKeys,
aExport,
aExportSecretKeyP12,
aExportSecretKeyP8,
aExportSecretKeyRaw,
aServer,
aLearnCard,
aCallDirmngr,
@ -208,7 +210,13 @@ static ARGPARSE_OPTS opts[] = {
/*ARGPARSE_c (aRecvKeys, "recv-keys", N_("import keys from a key server")),*/
ARGPARSE_c (aImport, "import", N_("import certificates")),
ARGPARSE_c (aExport, "export", N_("export certificates")),
/* We use -raw and not -p1 for pkcs#1 secret key export so that it
won't accidently be used in case -p12 was intended. */
ARGPARSE_c (aExportSecretKeyP12, "export-secret-key-p12", "@"),
ARGPARSE_c (aExportSecretKeyP8, "export-secret-key-p8", "@"),
ARGPARSE_c (aExportSecretKeyRaw, "export-secret-key-raw", "@"),
ARGPARSE_c (aLearnCard, "learn-card", N_("register a smartcard")),
ARGPARSE_c (aServer, "server", N_("run in server mode")),
ARGPARSE_c (aCallDirmngr, "call-dirmngr",
@ -1084,6 +1092,8 @@ main ( int argc, char **argv)
case aRecvKeys:
case aExport:
case aExportSecretKeyP12:
case aExportSecretKeyP8:
case aExportSecretKeyRaw:
case aDumpKeys:
case aDumpChain:
case aDumpExternalKeys:
@ -1888,7 +1898,7 @@ main ( int argc, char **argv)
estream_t fp = open_es_fwrite (opt.outfile?opt.outfile:"-");
if (argc == 1)
gpgsm_p12_export (&ctrl, *argv, fp);
gpgsm_p12_export (&ctrl, *argv, fp, 0);
else
wrong_args ("--export-secret-key-p12 KEY-ID");
if (fp != es_stdout)
@ -1896,6 +1906,32 @@ main ( int argc, char **argv)
}
break;
case aExportSecretKeyP8:
{
estream_t fp = open_es_fwrite (opt.outfile?opt.outfile:"-");
if (argc == 1)
gpgsm_p12_export (&ctrl, *argv, fp, 1);
else
wrong_args ("--export-secret-key-p8 KEY-ID");
if (fp != es_stdout)
es_fclose (fp);
}
break;
case aExportSecretKeyRaw:
{
estream_t fp = open_es_fwrite (opt.outfile?opt.outfile:"-");
if (argc == 1)
gpgsm_p12_export (&ctrl, *argv, fp, 2);
else
wrong_args ("--export-secret-key-raw KEY-ID");
if (fp != es_stdout)
es_fclose (fp);
}
break;
case aSendKeys:
case aRecvKeys:
log_error ("this command has not yet been implemented\n");

3
sm/gpgsm.h
View File

@ -348,7 +348,8 @@ int gpgsm_import_files (ctrl_t ctrl, int nfiles, char **files,
/*-- export.c --*/
void gpgsm_export (ctrl_t ctrl, strlist_t names, estream_t stream);
void gpgsm_p12_export (ctrl_t ctrl, const char *name, estream_t stream);
void gpgsm_p12_export (ctrl_t ctrl, const char *name, estream_t stream,
int rawmode);
/*-- delete.c --*/
int gpgsm_delete (ctrl_t ctrl, strlist_t names);

112
sm/minip12.c
View File

@ -1,5 +1,6 @@
/* minip12.c - A minimal pkcs-12 implementation.
* Copyright (C) 2002, 2003, 2004, 2006, 2011 Free Software Foundation, Inc.
* Copyright (C) 2014 Werner Koch
*
* This file is part of GnuPG.
*
@ -1891,10 +1892,15 @@ create_final (struct buffer_s *sequences, const char *pw, size_t *r_length)
}
}
}
MODE controls what is being generated:
0 - As described above
1 - Ditto but without the padding
2 - Only the inner part (pkcs#1)
*/
static unsigned char *
build_key_sequence (gcry_mpi_t *kparms, size_t *r_length)
build_key_sequence (gcry_mpi_t *kparms, int mode, size_t *r_length)
{
int rc, i;
size_t needed, n;
@ -1902,7 +1908,7 @@ build_key_sequence (gcry_mpi_t *kparms, size_t *r_length)
size_t plainlen;
size_t outseqlen, oidseqlen, octstrlen, inseqlen;
needed = 3; /* The version(?) integer of value 0. */
needed = 3; /* The version integer with value 0. */
for (i=0; kparms[i]; i++)
{
n = 0;
@ -1929,23 +1935,27 @@ build_key_sequence (gcry_mpi_t *kparms, size_t *r_length)
if (!n)
return NULL;
needed += n;
/* Encapsulate all into an octet string. */
octstrlen = needed;
n = compute_tag_length (needed);
if (!n)
return NULL;
needed += n;
/* Prepend the object identifier sequence. */
oidseqlen = 2 + DIM (oid_rsaEncryption) + 2;
needed += 2 + oidseqlen;
/* The version number. */
needed += 3;
/* And finally put the whole thing into a sequence. */
outseqlen = needed;
n = compute_tag_length (needed);
if (!n)
return NULL;
needed += n;
if (mode != 2)
{
/* Encapsulate all into an octet string. */
octstrlen = needed;
n = compute_tag_length (needed);
if (!n)
return NULL;
needed += n;
/* Prepend the object identifier sequence. */
oidseqlen = 2 + DIM (oid_rsaEncryption) + 2;
needed += 2 + oidseqlen;
/* The version number. */
needed += 3;
/* And finally put the whole thing into a sequence. */
outseqlen = needed;
n = compute_tag_length (needed);
if (!n)
return NULL;
needed += n;
}
/* allocate 8 extra bytes for padding */
plain = gcry_malloc_secure (needed+8);
@ -1957,20 +1967,24 @@ build_key_sequence (gcry_mpi_t *kparms, size_t *r_length)
/* And now fill the plaintext buffer. */
p = plain;
p = store_tag_length (p, TAG_SEQUENCE, outseqlen);
/* Store version. */
*p++ = TAG_INTEGER;
*p++ = 1;
*p++ = 0;
/* Store object identifier sequence. */
p = store_tag_length (p, TAG_SEQUENCE, oidseqlen);
p = store_tag_length (p, TAG_OBJECT_ID, DIM (oid_rsaEncryption));
memcpy (p, oid_rsaEncryption, DIM (oid_rsaEncryption));
p += DIM (oid_rsaEncryption);
*p++ = TAG_NULL;
*p++ = 0;
/* Start with the octet string. */
p = store_tag_length (p, TAG_OCTET_STRING, octstrlen);
if (mode != 2)
{
p = store_tag_length (p, TAG_SEQUENCE, outseqlen);
/* Store version. */
*p++ = TAG_INTEGER;
*p++ = 1;
*p++ = 0;
/* Store object identifier sequence. */
p = store_tag_length (p, TAG_SEQUENCE, oidseqlen);
p = store_tag_length (p, TAG_OBJECT_ID, DIM (oid_rsaEncryption));
memcpy (p, oid_rsaEncryption, DIM (oid_rsaEncryption));
p += DIM (oid_rsaEncryption);
*p++ = TAG_NULL;
*p++ = 0;
/* Start with the octet string. */
p = store_tag_length (p, TAG_OCTET_STRING, octstrlen);
}
p = store_tag_length (p, TAG_SEQUENCE, inseqlen);
/* Store the key parameters. */
*p++ = TAG_INTEGER;
@ -2003,10 +2017,14 @@ build_key_sequence (gcry_mpi_t *kparms, size_t *r_length)
plainlen = p - plain;
assert (needed == plainlen);
/* Append some pad characters; we already allocated extra space. */
n = 8 - plainlen % 8;
for (i=0; i < n; i++, plainlen++)
*p++ = n;
if (!mode)
{
/* Append some pad characters; we already allocated extra space. */
n = 8 - plainlen % 8;
for (i=0; i < n; i++, plainlen++)
*p++ = n;
}
*r_length = plainlen;
return plain;
@ -2459,7 +2477,7 @@ p12_build (gcry_mpi_t *kparms, const void *cert, size_t certlen,
if (kparms)
{
/* Encode the key. */
buffer = build_key_sequence (kparms, &buflen);
buffer = build_key_sequence (kparms, 0, &buflen);
if (!buffer)
goto failure;
@ -2502,6 +2520,24 @@ p12_build (gcry_mpi_t *kparms, const void *cert, size_t certlen,
}
/* This is actually not a pkcs#12 function but one which creates an
unencrypted a pkcs#1 private key. */
unsigned char *
p12_raw_build (gcry_mpi_t *kparms, int rawmode, size_t *r_length)
{
unsigned char *buffer;
size_t buflen;
assert (rawmode == 1 || rawmode == 2);
buffer = build_key_sequence (kparms, rawmode, &buflen);
if (!buffer)
return NULL;
*r_length = buflen;
return buffer;
}
#ifdef TEST
static void

3
sm/minip12.h
View File

@ -31,6 +31,9 @@ unsigned char *p12_build (gcry_mpi_t *kparms,
const void *cert, size_t certlen,
const char *pw, const char *charset,
size_t *r_length);
unsigned char *p12_raw_build (gcry_mpi_t *kparms,
int rawmode,
size_t *r_length);
#endif /*MINIP12_H*/