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agent: Add --card option for READKEY.

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* agent/findkey.c (agent_write_shadow_key): New.
* agent/command-ssh.c (card_key_available): Use agent_write_shadow_key.
* agent/learncard.c (agent_handle_learn): Likewise.
* agent/command.c (cmd_readkey): Add --card option.
--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2016-10-20 12:05:15 +09:00
parent 72a99f582d
commit 82cbab906a
5 changed files with 100 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
agent/agent.h
View File

@ -490,6 +490,9 @@ gpg_error_t s2k_hash_passphrase (const char *passphrase, int hashalgo,
const unsigned char *s2ksalt,
unsigned int s2kcount,
unsigned char *key, size_t keylen);
gpg_error_t agent_write_shadow_key (const unsigned char *grip,
const char *serialno, const char *keyid,
const unsigned char *pkbuf, int force);
/*-- trustlist.c --*/

32
agent/command-ssh.c
View File

@ -2474,39 +2474,9 @@ card_key_available (ctrl_t ctrl, gcry_sexp_t *r_pk, char **cardsn)
if ( agent_key_available (grip) )
{
/* (Shadow)-key is not available in our key storage. */
unsigned char *shadow_info;
unsigned char *tmp;
shadow_info = make_shadow_info (serialno, authkeyid);
if (!shadow_info)
{
err = gpg_error_from_syserror ();
xfree (pkbuf);
gcry_sexp_release (s_pk);
xfree (serialno);
xfree (authkeyid);
return err;
}
err = agent_shadow_key (pkbuf, shadow_info, &tmp);
xfree (shadow_info);
err = agent_write_shadow_key (grip, serialno, authkeyid, pkbuf, 0);
if (err)
{
log_error (_("shadowing the key failed: %s\n"), gpg_strerror (err));
xfree (pkbuf);
gcry_sexp_release (s_pk);
xfree (serialno);
xfree (authkeyid);
return err;
}
xfree (pkbuf);
pkbuf = tmp;
pkbuflen = gcry_sexp_canon_len (pkbuf, 0, NULL, NULL);
assert (pkbuflen);
err = agent_write_private_key (grip, pkbuf, pkbuflen, 0);
if (err)
{
log_error (_("error writing key: %s\n"), gpg_strerror (err));
xfree (pkbuf);
gcry_sexp_release (s_pk);
xfree (serialno);

69
agent/command.c
View File

@ -988,8 +988,10 @@ cmd_genkey (assuan_context_t ctx, char *line)
static const char hlp_readkey[] =
"READKEY <hexstring_with_keygrip>\n"
" --card <keyid>\n"
"\n"
"Return the public key for the given keygrip.";
"Return the public key for the given keygrip or keyid.\n"
"With --card, private key file with card information will be created.";
static gpg_error_t
cmd_readkey (assuan_context_t ctx, char *line)
{
@ -997,10 +999,57 @@ cmd_readkey (assuan_context_t ctx, char *line)
int rc;
unsigned char grip[20];
gcry_sexp_t s_pkey = NULL;
unsigned char *pkbuf = NULL;
size_t pkbuflen;
if (ctrl->restricted)
return leave_cmd (ctx, gpg_error (GPG_ERR_FORBIDDEN));
if (has_option_name (line, "--card"))
{
const char *keyid;
char *serialno = NULL;
keyid = skip_options (line);
rc = agent_card_getattr (ctrl, "SERIALNO", &serialno);
if (rc)
{
log_error (_("error getting serial number of card: %s\n"),
gpg_strerror (rc));
goto leave;
}
pkbuflen = gcry_sexp_canon_len (pkbuf, 0, NULL, NULL);
rc = agent_card_readkey (ctrl, keyid, &pkbuf);
if (rc)
goto leave;
rc = gcry_sexp_sscan (&s_pkey, NULL, (char*)pkbuf, pkbuflen);
if (rc)
goto leave;
if (!gcry_pk_get_keygrip (s_pkey, grip))
{
rc = gcry_pk_testkey (s_pkey);
if (rc == 0)
rc = gpg_error (GPG_ERR_INTERNAL);
goto leave;
}
rc = agent_write_shadow_key (grip, serialno, keyid, pkbuf, 0);
if (rc)
goto leave;
rc = assuan_send_data (ctx, pkbuf, pkbuflen);
leave:
xfree (serialno);
xfree (pkbuf);
gcry_sexp_release (s_pkey);
return leave_cmd (ctx, rc);
}
rc = parse_keygrip (ctx, line, grip);
if (rc)
return rc; /* Return immediately as this is already an Assuan error code.*/
@ -1008,20 +1057,16 @@ cmd_readkey (assuan_context_t ctx, char *line)
rc = agent_public_key_from_file (ctrl, grip, &s_pkey);
if (!rc)
{
size_t len;
unsigned char *buf;
len = gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, NULL, 0);
assert (len);
buf = xtrymalloc (len);
if (!buf)
pkbuflen = gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, NULL, 0);
assert (pkbuflen);
pkbuf = xtrymalloc (pkbuflen);
if (!pkbuf)
rc = gpg_error_from_syserror ();
else
{
len = gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, buf, len);
assert (len);
rc = assuan_send_data (ctx, buf, len);
xfree (buf);
gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, pkbuf, pkbuflen);
rc = assuan_send_data (ctx, pkbuf, pkbuflen);
xfree (pkbuf);
}
gcry_sexp_release (s_pkey);
}

36
agent/findkey.c
View File

@ -1492,3 +1492,39 @@ agent_delete_key (ctrl_t ctrl, const char *desc_text,
gcry_sexp_release (s_skey);
return err;
}
/* Write an S-expression formatted shadow key to our key storage.
Shadow key is created by an S-expression public key in PKBUF and
card's SERIALNO and the IDSTRING. With FORCE passed as true an
existing key with the given GRIP will get overwritten. */
gpg_error_t
agent_write_shadow_key (const unsigned char *grip,
const char *serialno, const char *keyid,
const unsigned char *pkbuf, int force)
{
gpg_error_t err;
unsigned char *shadow_info;
unsigned char *shdkey;
size_t len;
shadow_info = make_shadow_info (serialno, keyid);
if (!shadow_info)
return gpg_error_from_syserror ();
err = agent_shadow_key (pkbuf, shadow_info, &shdkey);
xfree (shadow_info);
if (err)
{
log_error ("shadowing the key failed: %s\n", gpg_strerror (err));
return err;
}
len = gcry_sexp_canon_len (shdkey, 0, NULL, NULL);
err = agent_write_private_key (grip, shdkey, len, force);
xfree (shdkey);
if (err)
log_error ("error writing key: %s\n", gpg_strerror (err));
return err;
}

28
agent/learncard.c
View File

@ -381,8 +381,7 @@ agent_handle_learn (ctrl_t ctrl, int send, void *assuan_context, int force)
for (item = parm.info; item; item = item->next)
{
unsigned char *pubkey, *shdkey;
size_t n;
unsigned char *pubkey;
if (opt.verbose)
log_info (" id: %s (grip=%s)\n", item->id, item->hexgrip);
@ -410,33 +409,10 @@ agent_handle_learn (ctrl_t ctrl, int send, void *assuan_context, int force)
goto leave;
}
{
unsigned char *shadow_info = make_shadow_info (serialno, item->id);
if (!shadow_info)
{
rc = gpg_error (GPG_ERR_ENOMEM);
xfree (pubkey);
goto leave;
}
rc = agent_shadow_key (pubkey, shadow_info, &shdkey);
xfree (shadow_info);
}
rc = agent_write_shadow_key (grip, serialno, item->id, pubkey, force);
xfree (pubkey);
if (rc)
{
log_error ("shadowing the key failed: %s\n", gpg_strerror (rc));
goto leave;
}
n = gcry_sexp_canon_len (shdkey, 0, NULL, NULL);
assert (n);
rc = agent_write_private_key (grip, shdkey, n, force);
xfree (shdkey);
if (rc)
{
log_error ("error writing key: %s\n", gpg_strerror (rc));
goto leave;
}
if (opt.verbose)
log_info (" id: %s - shadow key created\n", item->id);