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gnupg/sm/call-agent.c
Werner Koch 2b1135cf92
scd: New standard attributes $ENCRKEYID and $SIGNKEYID. 
* g10/call-agent.c (agent_scd_keypairinfo): Use --keypairinfo.
* sm/call-agent.c (gpgsm_agent_scd_keypairinfo): Ditto.
* scd/app-openpgp.c (do_getattr): Add attributes "$ENCRKEYID" and
"$SIGNKEYID".
* scd/app-piv.c (do_getattr): Ditto.
--

We already have $AUTHKEYID to locate the keyref of the key to be used
with ssh.  It will also be useful to have default keyref for
encryption and signing.  For example, this will allow us to repalce
the use of "OPENPGP.2" by a app type specific keyref.

Signed-off-by: Werner Koch <wk@gnupg.org>
2019-04-03 13:16:22 +02:00

1439 lines
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/* call-agent.c - Divert GPGSM operations to the agent
* Copyright (C) 2001, 2002, 2003, 2005, 2007,
* 2008, 2009, 2010 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <assert.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#include "gpgsm.h"
#include <gcrypt.h>
#include <assuan.h>
#include "../common/i18n.h"
#include "../common/asshelp.h"
#include "keydb.h" /* fixme: Move this to import.c */
#include "../common/membuf.h"
#include "../common/shareddefs.h"
#include "passphrase.h"
static assuan_context_t agent_ctx = NULL;
struct cipher_parm_s
{
ctrl_t ctrl;
assuan_context_t ctx;
const unsigned char *ciphertext;
size_t ciphertextlen;
};
struct genkey_parm_s
{
ctrl_t ctrl;
assuan_context_t ctx;
const unsigned char *sexp;
size_t sexplen;
};
struct learn_parm_s
{
int error;
ctrl_t ctrl;
assuan_context_t ctx;
membuf_t *data;
};
struct import_key_parm_s
{
ctrl_t ctrl;
assuan_context_t ctx;
const void *key;
size_t keylen;
};
struct default_inq_parm_s
{
ctrl_t ctrl;
assuan_context_t ctx;
};
/* Print a warning if the server's version number is less than our
version number. Returns an error code on a connection problem. */
static gpg_error_t
warn_version_mismatch (ctrl_t ctrl, assuan_context_t ctx,
const char *servername, int mode)
{
gpg_error_t err;
char *serverversion;
const char *myversion = strusage (13);
err = get_assuan_server_version (ctx, mode, &serverversion);
if (err)
log_error (_("error getting version from '%s': %s\n"),
servername, gpg_strerror (err));
else if (compare_version_strings (serverversion, myversion) < 0)
{
char *warn;
warn = xtryasprintf (_("server '%s' is older than us (%s < %s)"),
servername, serverversion, myversion);
if (!warn)
err = gpg_error_from_syserror ();
else
{
log_info (_("WARNING: %s\n"), warn);
if (!opt.quiet)
{
log_info (_("Note: Outdated servers may lack important"
" security fixes.\n"));
log_info (_("Note: Use the command \"%s\" to restart them.\n"),
"gpgconf --kill all");
}
gpgsm_status2 (ctrl, STATUS_WARNING, "server_version_mismatch 0",
warn, NULL);
xfree (warn);
}
}
xfree (serverversion);
return err;
}
/* Try to connect to the agent via socket or fork it off and work by
pipes. Handle the server's initial greeting */
static int
start_agent (ctrl_t ctrl)
{
int rc;
if (agent_ctx)
rc = 0; /* fixme: We need a context for each thread or
serialize the access to the agent (which is
suitable given that the agent is not MT. */
else
{
rc = start_new_gpg_agent (&agent_ctx,
GPG_ERR_SOURCE_DEFAULT,
opt.agent_program,
opt.lc_ctype, opt.lc_messages,
opt.session_env,
opt.autostart, opt.verbose, DBG_IPC,
gpgsm_status2, ctrl);
if (!opt.autostart && gpg_err_code (rc) == GPG_ERR_NO_AGENT)
{
static int shown;
if (!shown)
{
shown = 1;
log_info (_("no gpg-agent running in this session\n"));
}
}
else if (!rc && !(rc = warn_version_mismatch (ctrl, agent_ctx,
GPG_AGENT_NAME, 0)))
{
/* Tell the agent that we support Pinentry notifications. No
error checking so that it will work also with older
agents. */
assuan_transact (agent_ctx, "OPTION allow-pinentry-notify",
NULL, NULL, NULL, NULL, NULL, NULL);
/* Pass on the pinentry mode. */
if (opt.pinentry_mode)
{
char *tmp = xasprintf ("OPTION pinentry-mode=%s",
str_pinentry_mode (opt.pinentry_mode));
rc = assuan_transact (agent_ctx, tmp,
NULL, NULL, NULL, NULL, NULL, NULL);
xfree (tmp);
if (rc)
log_error ("setting pinentry mode '%s' failed: %s\n",
str_pinentry_mode (opt.pinentry_mode),
gpg_strerror (rc));
}
/* Pass on the request origin. */
if (opt.request_origin)
{
char *tmp = xasprintf ("OPTION pretend-request-origin=%s",
str_request_origin (opt.request_origin));
rc = assuan_transact (agent_ctx, tmp,
NULL, NULL, NULL, NULL, NULL, NULL);
xfree (tmp);
if (rc)
log_error ("setting request origin '%s' failed: %s\n",
str_request_origin (opt.request_origin),
gpg_strerror (rc));
}
/* In DE_VS mode under Windows we require that the JENT RNG
* is active. */
#ifdef HAVE_W32_SYSTEM
if (!rc && opt.compliance == CO_DE_VS)
{
if (assuan_transact (agent_ctx, "GETINFO jent_active",
NULL, NULL, NULL, NULL, NULL, NULL))
{
rc = gpg_error (GPG_ERR_FORBIDDEN);
log_error (_("%s is not compliant with %s mode\n"),
GPG_AGENT_NAME,
gnupg_compliance_option_string (opt.compliance));
gpgsm_status_with_error (ctrl, STATUS_ERROR,
"random-compliance", rc);
}
}
#endif /*HAVE_W32_SYSTEM*/
}
}
if (!ctrl->agent_seen)
{
ctrl->agent_seen = 1;
audit_log_ok (ctrl->audit, AUDIT_AGENT_READY, rc);
}
return rc;
}
/* This is the default inquiry callback. It mainly handles the
Pinentry notifications. */
static gpg_error_t
default_inq_cb (void *opaque, const char *line)
{
gpg_error_t err = 0;
struct default_inq_parm_s *parm = opaque;
ctrl_t ctrl = parm->ctrl;
if (has_leading_keyword (line, "PINENTRY_LAUNCHED"))
{
err = gpgsm_proxy_pinentry_notify (ctrl, line);
if (err)
log_error (_("failed to proxy %s inquiry to client\n"),
"PINENTRY_LAUNCHED");
/* We do not pass errors to avoid breaking other code. */
}
else if ((has_leading_keyword (line, "PASSPHRASE")
|| has_leading_keyword (line, "NEW_PASSPHRASE"))
&& opt.pinentry_mode == PINENTRY_MODE_LOOPBACK
&& have_static_passphrase ())
{
const char *s = get_static_passphrase ();
err = assuan_send_data (parm->ctx, s, strlen (s));
}
else
log_error ("ignoring gpg-agent inquiry '%s'\n", line);
return err;
}
/* Call the agent to do a sign operation using the key identified by
the hex string KEYGRIP. */
int
gpgsm_agent_pksign (ctrl_t ctrl, const char *keygrip, const char *desc,
unsigned char *digest, size_t digestlen, int digestalgo,
unsigned char **r_buf, size_t *r_buflen )
{
int rc, i;
char *p, line[ASSUAN_LINELENGTH];
membuf_t data;
size_t len;
struct default_inq_parm_s inq_parm;
*r_buf = NULL;
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
if (digestlen*2 + 50 > DIM(line))
return gpg_error (GPG_ERR_GENERAL);
rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
snprintf (line, DIM(line), "SIGKEY %s", keygrip);
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
if (desc)
{
snprintf (line, DIM(line), "SETKEYDESC %s", desc);
rc = assuan_transact (agent_ctx, line,
NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
}
sprintf (line, "SETHASH %d ", digestalgo);
p = line + strlen (line);
for (i=0; i < digestlen ; i++, p += 2 )
sprintf (p, "%02X", digest[i]);
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
init_membuf (&data, 1024);
rc = assuan_transact (agent_ctx, "PKSIGN",
put_membuf_cb, &data, default_inq_cb, &inq_parm,
NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return rc;
}
*r_buf = get_membuf (&data, r_buflen);
if (!gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL))
{
xfree (*r_buf); *r_buf = NULL;
return gpg_error (GPG_ERR_INV_VALUE);
}
return *r_buf? 0 : out_of_core ();
}
/* Call the scdaemon to do a sign operation using the key identified by
the hex string KEYID. */
int
gpgsm_scd_pksign (ctrl_t ctrl, const char *keyid, const char *desc,
unsigned char *digest, size_t digestlen, int digestalgo,
unsigned char **r_buf, size_t *r_buflen )
{
int rc, i, pkalgo;
char *p, line[ASSUAN_LINELENGTH];
membuf_t data;
size_t len;
const char *hashopt;
unsigned char *sigbuf;
size_t sigbuflen;
struct default_inq_parm_s inq_parm;
gcry_sexp_t sig;
(void)desc;
*r_buf = NULL;
switch(digestalgo)
{
case GCRY_MD_SHA1: hashopt = "--hash=sha1"; break;
case GCRY_MD_RMD160:hashopt = "--hash=rmd160"; break;
case GCRY_MD_MD5: hashopt = "--hash=md5"; break;
case GCRY_MD_SHA256:hashopt = "--hash=sha256"; break;
case GCRY_MD_SHA512:hashopt = "--hash=sha512"; break;
default:
return gpg_error (GPG_ERR_DIGEST_ALGO);
}
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
if (digestlen*2 + 50 > DIM(line))
return gpg_error (GPG_ERR_GENERAL);
/* Get the key type from the scdaemon. */
snprintf (line, DIM(line), "SCD READKEY %s", keyid);
init_membuf (&data, 1024);
rc = assuan_transact (agent_ctx, line,
put_membuf_cb, &data, NULL, NULL, NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return rc;
}
p = get_membuf (&data, &len);
pkalgo = get_pk_algo_from_canon_sexp (p, len);
xfree (p);
if (!pkalgo)
return gpg_error (GPG_ERR_WRONG_PUBKEY_ALGO);
p = stpcpy (line, "SCD SETDATA " );
for (i=0; i < digestlen ; i++, p += 2 )
sprintf (p, "%02X", digest[i]);
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
init_membuf (&data, 1024);
snprintf (line, DIM(line), "SCD PKSIGN %s %s", hashopt, keyid);
rc = assuan_transact (agent_ctx, line,
put_membuf_cb, &data, default_inq_cb, &inq_parm,
NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return rc;
}
sigbuf = get_membuf (&data, &sigbuflen);
switch(pkalgo)
{
case GCRY_PK_RSA:
rc = gcry_sexp_build (&sig, NULL, "(sig-val(rsa(s%b)))",
sigbuflen, sigbuf);
break;
case GCRY_PK_ECC:
rc = gcry_sexp_build (&sig, NULL, "(sig-val(ecdsa(r%b)(s%b)))",
sigbuflen/2, sigbuf,
sigbuflen/2, sigbuf + sigbuflen/2);
break;
case GCRY_PK_EDDSA:
rc = gcry_sexp_build (&sig, NULL, "(sig-val(eddsa(r%b)(s%b)))",
sigbuflen/2, sigbuf,
sigbuflen/2, sigbuf + sigbuflen/2);
break;
default:
rc = gpg_error (GPG_ERR_WRONG_PUBKEY_ALGO);
break;
}
xfree (sigbuf);
if (rc)
return rc;
rc = make_canon_sexp (sig, r_buf, r_buflen);
gcry_sexp_release (sig);
if (rc)
return rc;
assert (gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL));
return 0;
}
/* Handle a CIPHERTEXT inquiry. Note, we only send the data,
assuan_transact takes care of flushing and writing the end */
static gpg_error_t
inq_ciphertext_cb (void *opaque, const char *line)
{
struct cipher_parm_s *parm = opaque;
int rc;
if (has_leading_keyword (line, "CIPHERTEXT"))
{
assuan_begin_confidential (parm->ctx);
rc = assuan_send_data (parm->ctx, parm->ciphertext, parm->ciphertextlen);
assuan_end_confidential (parm->ctx);
}
else
{
struct default_inq_parm_s inq_parm = { parm->ctrl, parm->ctx };
rc = default_inq_cb (&inq_parm, line);
}
return rc;
}
/* Call the agent to do a decrypt operation using the key identified by
the hex string KEYGRIP. */
int
gpgsm_agent_pkdecrypt (ctrl_t ctrl, const char *keygrip, const char *desc,
ksba_const_sexp_t ciphertext,
char **r_buf, size_t *r_buflen )
{
int rc;
char line[ASSUAN_LINELENGTH];
membuf_t data;
struct cipher_parm_s cipher_parm;
size_t n, len;
char *p, *buf, *endp;
size_t ciphertextlen;
if (!keygrip || strlen(keygrip) != 40 || !ciphertext || !r_buf || !r_buflen)
return gpg_error (GPG_ERR_INV_VALUE);
*r_buf = NULL;
ciphertextlen = gcry_sexp_canon_len (ciphertext, 0, NULL, NULL);
if (!ciphertextlen)
return gpg_error (GPG_ERR_INV_VALUE);
rc = start_agent (ctrl);
if (rc)
return rc;
rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
assert ( DIM(line) >= 50 );
snprintf (line, DIM(line), "SETKEY %s", keygrip);
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
if (desc)
{
snprintf (line, DIM(line), "SETKEYDESC %s", desc);
rc = assuan_transact (agent_ctx, line,
NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
}
init_membuf (&data, 1024);
cipher_parm.ctrl = ctrl;
cipher_parm.ctx = agent_ctx;
cipher_parm.ciphertext = ciphertext;
cipher_parm.ciphertextlen = ciphertextlen;
rc = assuan_transact (agent_ctx, "PKDECRYPT",
put_membuf_cb, &data,
inq_ciphertext_cb, &cipher_parm, NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return rc;
}
put_membuf (&data, "", 1); /* Make sure it is 0 terminated. */
buf = get_membuf (&data, &len);
if (!buf)
return gpg_error (GPG_ERR_ENOMEM);
assert (len); /* (we forced Nul termination.) */
if (*buf == '(')
{
if (len < 13 || memcmp (buf, "(5:value", 8) ) /* "(5:valueN:D)\0" */
return gpg_error (GPG_ERR_INV_SEXP);
len -= 11; /* Count only the data of the second part. */
p = buf + 8; /* Skip leading parenthesis and the value tag. */
}
else
{
/* For compatibility with older gpg-agents handle the old style
incomplete S-exps. */
len--; /* Do not count the Nul. */
p = buf;
}
n = strtoul (p, &endp, 10);
if (!n || *endp != ':')
return gpg_error (GPG_ERR_INV_SEXP);
endp++;
if (endp-p+n > len)
return gpg_error (GPG_ERR_INV_SEXP); /* Oops: Inconsistent S-Exp. */
memmove (buf, endp, n);
*r_buflen = n;
*r_buf = buf;
return 0;
}
/* Handle a KEYPARMS inquiry. Note, we only send the data,
assuan_transact takes care of flushing and writing the end */
static gpg_error_t
inq_genkey_parms (void *opaque, const char *line)
{
struct genkey_parm_s *parm = opaque;
int rc;
if (has_leading_keyword (line, "KEYPARAM"))
{
rc = assuan_send_data (parm->ctx, parm->sexp, parm->sexplen);
}
else
{
struct default_inq_parm_s inq_parm = { parm->ctrl, parm->ctx };
rc = default_inq_cb (&inq_parm, line);
}
return rc;
}
/* Call the agent to generate a newkey */
int
gpgsm_agent_genkey (ctrl_t ctrl,
ksba_const_sexp_t keyparms, ksba_sexp_t *r_pubkey)
{
int rc;
struct genkey_parm_s gk_parm;
membuf_t data;
size_t len;
unsigned char *buf;
*r_pubkey = NULL;
rc = start_agent (ctrl);
if (rc)
return rc;
rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
init_membuf (&data, 1024);
gk_parm.ctrl = ctrl;
gk_parm.ctx = agent_ctx;
gk_parm.sexp = keyparms;
gk_parm.sexplen = gcry_sexp_canon_len (keyparms, 0, NULL, NULL);
if (!gk_parm.sexplen)
return gpg_error (GPG_ERR_INV_VALUE);
rc = assuan_transact (agent_ctx, "GENKEY",
put_membuf_cb, &data,
inq_genkey_parms, &gk_parm, NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return rc;
}
buf = get_membuf (&data, &len);
if (!buf)
return gpg_error (GPG_ERR_ENOMEM);
if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
{
xfree (buf);
return gpg_error (GPG_ERR_INV_SEXP);
}
*r_pubkey = buf;
return 0;
}
/* Call the agent to read the public key part for a given keygrip. If
FROMCARD is true, the key is directly read from the current
smartcard. In this case HEXKEYGRIP should be the keyID
(e.g. OPENPGP.3). */
int
gpgsm_agent_readkey (ctrl_t ctrl, int fromcard, const char *hexkeygrip,
ksba_sexp_t *r_pubkey)
{
int rc;
membuf_t data;
size_t len;
unsigned char *buf;
char line[ASSUAN_LINELENGTH];
struct default_inq_parm_s inq_parm;
*r_pubkey = NULL;
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
rc = assuan_transact (agent_ctx, "RESET",NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
snprintf (line, DIM(line), "%sREADKEY %s",
fromcard? "SCD ":"", hexkeygrip);
init_membuf (&data, 1024);
rc = assuan_transact (agent_ctx, line,
put_membuf_cb, &data,
default_inq_cb, &inq_parm, NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return rc;
}
buf = get_membuf (&data, &len);
if (!buf)
return gpg_error (GPG_ERR_ENOMEM);
if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
{
xfree (buf);
return gpg_error (GPG_ERR_INV_SEXP);
}
*r_pubkey = buf;
return 0;
}
/* Take the serial number from LINE and return it verbatim in a newly
allocated string. We make sure that only hex characters are
returned. */
static char *
store_serialno (const char *line)
{
const char *s;
char *p;
for (s=line; hexdigitp (s); s++)
;
p = xtrymalloc (s + 1 - line);
if (p)
{
memcpy (p, line, s-line);
p[s-line] = 0;
}
return p;
}
/* Callback for the gpgsm_agent_serialno function. */
static gpg_error_t
scd_serialno_status_cb (void *opaque, const char *line)
{
char **r_serialno = opaque;
const char *keyword = line;
int keywordlen;
for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
;
while (spacep (line))
line++;
if (keywordlen == 8 && !memcmp (keyword, "SERIALNO", keywordlen))
{
xfree (*r_serialno);
*r_serialno = store_serialno (line);
}
return 0;
}
/* Call the agent to read the serial number of the current card. */
int
gpgsm_agent_scd_serialno (ctrl_t ctrl, char **r_serialno)
{
int rc;
char *serialno = NULL;
struct default_inq_parm_s inq_parm;
*r_serialno = NULL;
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
rc = assuan_transact (agent_ctx, "SCD SERIALNO",
NULL, NULL,
default_inq_cb, &inq_parm,
scd_serialno_status_cb, &serialno);
if (!rc && !serialno)
rc = gpg_error (GPG_ERR_INTERNAL);
if (rc)
{
xfree (serialno);
return rc;
}
*r_serialno = serialno;
return 0;
}
/* Callback for the gpgsm_agent_serialno function. */
static gpg_error_t
scd_keypairinfo_status_cb (void *opaque, const char *line)
{
strlist_t *listaddr = opaque;
const char *keyword = line;
int keywordlen;
strlist_t sl;
char *p;
for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
;
while (spacep (line))
line++;
if (keywordlen == 11 && !memcmp (keyword, "KEYPAIRINFO", keywordlen))
{
sl = append_to_strlist (listaddr, line);
p = sl->d;
/* Make sure that we only have two tokens so that future
* extensions of the format won't change the format expected by
* the caller. */
while (*p && !spacep (p))
p++;
if (*p)
{
while (spacep (p))
p++;
while (*p && !spacep (p))
p++;
if (*p)
{
*p++ = 0;
while (spacep (p))
p++;
while (*p && !spacep (p))
{
switch (*p++)
{
case 'c': sl->flags |= GCRY_PK_USAGE_CERT; break;
case 's': sl->flags |= GCRY_PK_USAGE_SIGN; break;
case 'e': sl->flags |= GCRY_PK_USAGE_ENCR; break;
case 'a': sl->flags |= GCRY_PK_USAGE_AUTH; break;
}
}
}
}
}
return 0;
}
/* Call the agent to read the keypairinfo lines of the current card.
The list is returned as a string made up of the keygrip, a space
and the keyid. The flags of the string carry the usage bits. */
int
gpgsm_agent_scd_keypairinfo (ctrl_t ctrl, strlist_t *r_list)
{
int rc;
strlist_t list = NULL;
struct default_inq_parm_s inq_parm;
*r_list = NULL;
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
rc = assuan_transact (agent_ctx, "SCD LEARN --keypairinfo",
NULL, NULL,
default_inq_cb, &inq_parm,
scd_keypairinfo_status_cb, &list);
if (!rc && !list)
rc = gpg_error (GPG_ERR_NO_DATA);
if (rc)
{
free_strlist (list);
return rc;
}
*r_list = list;
return 0;
}
static gpg_error_t
istrusted_status_cb (void *opaque, const char *line)
{
struct rootca_flags_s *flags = opaque;
const char *s;
if ((s = has_leading_keyword (line, "TRUSTLISTFLAG")))
{
line = s;
if (has_leading_keyword (line, "relax"))
flags->relax = 1;
else if (has_leading_keyword (line, "cm"))
flags->chain_model = 1;
}
return 0;
}
/* Ask the agent whether the certificate is in the list of trusted
keys. The certificate is either specified by the CERT object or by
the fingerprint HEXFPR. ROOTCA_FLAGS is guaranteed to be cleared
on error. */
int
gpgsm_agent_istrusted (ctrl_t ctrl, ksba_cert_t cert, const char *hexfpr,
struct rootca_flags_s *rootca_flags)
{
int rc;
char line[ASSUAN_LINELENGTH];
memset (rootca_flags, 0, sizeof *rootca_flags);
if (cert && hexfpr)
return gpg_error (GPG_ERR_INV_ARG);
rc = start_agent (ctrl);
if (rc)
return rc;
if (hexfpr)
{
snprintf (line, DIM(line), "ISTRUSTED %s", hexfpr);
}
else
{
char *fpr;
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
if (!fpr)
{
log_error ("error getting the fingerprint\n");
return gpg_error (GPG_ERR_GENERAL);
}
snprintf (line, DIM(line), "ISTRUSTED %s", fpr);
xfree (fpr);
}
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL,
istrusted_status_cb, rootca_flags);
if (!rc)
rootca_flags->valid = 1;
return rc;
}
/* Ask the agent to mark CERT as a trusted Root-CA one */
int
gpgsm_agent_marktrusted (ctrl_t ctrl, ksba_cert_t cert)
{
int rc;
char *fpr, *dn, *dnfmt;
char line[ASSUAN_LINELENGTH];
struct default_inq_parm_s inq_parm;
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
if (!fpr)
{
log_error ("error getting the fingerprint\n");
return gpg_error (GPG_ERR_GENERAL);
}
dn = ksba_cert_get_issuer (cert, 0);
if (!dn)
{
xfree (fpr);
return gpg_error (GPG_ERR_GENERAL);
}
dnfmt = gpgsm_format_name2 (dn, 0);
xfree (dn);
if (!dnfmt)
return gpg_error_from_syserror ();
snprintf (line, DIM(line), "MARKTRUSTED %s S %s", fpr, dnfmt);
ksba_free (dnfmt);
xfree (fpr);
rc = assuan_transact (agent_ctx, line, NULL, NULL,
default_inq_cb, &inq_parm, NULL, NULL);
return rc;
}
/* Ask the agent whether the a corresponding secret key is available
for the given keygrip */
int
gpgsm_agent_havekey (ctrl_t ctrl, const char *hexkeygrip)
{
int rc;
char line[ASSUAN_LINELENGTH];
rc = start_agent (ctrl);
if (rc)
return rc;
if (!hexkeygrip || strlen (hexkeygrip) != 40)
return gpg_error (GPG_ERR_INV_VALUE);
snprintf (line, DIM(line), "HAVEKEY %s", hexkeygrip);
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
return rc;
}
static gpg_error_t
learn_status_cb (void *opaque, const char *line)
{
struct learn_parm_s *parm = opaque;
const char *s;
/* Pass progress data to the caller. */
if ((s = has_leading_keyword (line, "PROGRESS")))
{
line = s;
if (parm->ctrl)
{
if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, line))
return gpg_error (GPG_ERR_ASS_CANCELED);
}
}
return 0;
}
static gpg_error_t
learn_cb (void *opaque, const void *buffer, size_t length)
{
struct learn_parm_s *parm = opaque;
size_t len;
char *buf;
ksba_cert_t cert;
int rc;
if (parm->error)
return 0;
if (buffer)
{
put_membuf (parm->data, buffer, length);
return 0;
}
/* END encountered - process what we have */
buf = get_membuf (parm->data, &len);
if (!buf)
{
parm->error = gpg_error (GPG_ERR_ENOMEM);
return 0;
}
if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, "learncard C 0 0"))
return gpg_error (GPG_ERR_ASS_CANCELED);
/* FIXME: this should go into import.c */
rc = ksba_cert_new (&cert);
if (rc)
{
parm->error = rc;
return 0;
}
rc = ksba_cert_init_from_mem (cert, buf, len);
if (rc)
{
log_error ("failed to parse a certificate: %s\n", gpg_strerror (rc));
ksba_cert_release (cert);
parm->error = rc;
return 0;
}
/* We do not store a certifciate with missing issuers as ephemeral
because we can assume that the --learn-card command has been used
on purpose. */
rc = gpgsm_basic_cert_check (parm->ctrl, cert);
if (rc && gpg_err_code (rc) != GPG_ERR_MISSING_CERT
&& gpg_err_code (rc) != GPG_ERR_MISSING_ISSUER_CERT)
log_error ("invalid certificate: %s\n", gpg_strerror (rc));
else
{
int existed;
if (!keydb_store_cert (parm->ctrl, cert, 0, &existed))
{
if (opt.verbose > 1 && existed)
log_info ("certificate already in DB\n");
else if (opt.verbose && !existed)
log_info ("certificate imported\n");
}
}
ksba_cert_release (cert);
init_membuf (parm->data, 4096);
return 0;
}
/* Call the agent to learn about a smartcard */
int
gpgsm_agent_learn (ctrl_t ctrl)
{
int rc;
struct learn_parm_s learn_parm;
membuf_t data;
size_t len;
rc = start_agent (ctrl);
if (rc)
return rc;
rc = warn_version_mismatch (ctrl, agent_ctx, SCDAEMON_NAME, 2);
if (rc)
return rc;
init_membuf (&data, 4096);
learn_parm.error = 0;
learn_parm.ctrl = ctrl;
learn_parm.ctx = agent_ctx;
learn_parm.data = &data;
rc = assuan_transact (agent_ctx, "LEARN --send",
learn_cb, &learn_parm,
NULL, NULL,
learn_status_cb, &learn_parm);
xfree (get_membuf (&data, &len));
if (rc)
return rc;
return learn_parm.error;
}
/* Ask the agent to change the passphrase of the key identified by
HEXKEYGRIP. If DESC is not NULL, display instead of the default
description message. */
int
gpgsm_agent_passwd (ctrl_t ctrl, const char *hexkeygrip, const char *desc)
{
int rc;
char line[ASSUAN_LINELENGTH];
struct default_inq_parm_s inq_parm;
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
if (!hexkeygrip || strlen (hexkeygrip) != 40)
return gpg_error (GPG_ERR_INV_VALUE);
if (desc)
{
snprintf (line, DIM(line), "SETKEYDESC %s", desc);
rc = assuan_transact (agent_ctx, line,
NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
}
snprintf (line, DIM(line), "PASSWD %s", hexkeygrip);
rc = assuan_transact (agent_ctx, line, NULL, NULL,
default_inq_cb, &inq_parm, NULL, NULL);
return rc;
}
/* Ask the agent to pop up a confirmation dialog with the text DESC
and an okay and cancel button. */
gpg_error_t
gpgsm_agent_get_confirmation (ctrl_t ctrl, const char *desc)
{
int rc;
char line[ASSUAN_LINELENGTH];
struct default_inq_parm_s inq_parm;
rc = start_agent (ctrl);
if (rc)
return rc;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
snprintf (line, DIM(line), "GET_CONFIRMATION %s", desc);
rc = assuan_transact (agent_ctx, line, NULL, NULL,
default_inq_cb, &inq_parm, NULL, NULL);
return rc;
}
/* Return 0 if the agent is alive. This is useful to make sure that
an agent has been started. */
gpg_error_t
gpgsm_agent_send_nop (ctrl_t ctrl)
{
int rc;
rc = start_agent (ctrl);
if (!rc)
rc = assuan_transact (agent_ctx, "NOP",
NULL, NULL, NULL, NULL, NULL, NULL);
return rc;
}
static gpg_error_t
keyinfo_status_cb (void *opaque, const char *line)
{
char **serialno = opaque;
const char *s, *s2;
if ((s = has_leading_keyword (line, "KEYINFO")) && !*serialno)
{
s = strchr (s, ' ');
if (s && s[1] == 'T' && s[2] == ' ' && s[3])
{
s += 3;
s2 = strchr (s, ' ');
if ( s2 > s )
{
*serialno = xtrymalloc ((s2 - s)+1);
if (*serialno)
{
memcpy (*serialno, s, s2 - s);
(*serialno)[s2 - s] = 0;
}
}
}
}
return 0;
}
/* Return the serial number for a secret key. If the returned serial
number is NULL, the key is not stored on a smartcard. Caller needs
to free R_SERIALNO. */
gpg_error_t
gpgsm_agent_keyinfo (ctrl_t ctrl, const char *hexkeygrip, char **r_serialno)
{
gpg_error_t err;
char line[ASSUAN_LINELENGTH];
char *serialno = NULL;
*r_serialno = NULL;
err = start_agent (ctrl);
if (err)
return err;
if (!hexkeygrip || strlen (hexkeygrip) != 40)
return gpg_error (GPG_ERR_INV_VALUE);
snprintf (line, DIM(line), "KEYINFO %s", hexkeygrip);
err = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL,
keyinfo_status_cb, &serialno);
if (!err && serialno)
{
/* Sanity check for bad characters. */
if (strpbrk (serialno, ":\n\r"))
err = GPG_ERR_INV_VALUE;
}
if (err)
xfree (serialno);
else
*r_serialno = serialno;
return err;
}
/* Ask for the passphrase (this is used for pkcs#12 import/export. On
success the caller needs to free the string stored at R_PASSPHRASE.
On error NULL will be stored at R_PASSPHRASE and an appropriate
error code returned. If REPEAT is true the agent tries to get a
new passphrase (i.e. asks the user to confirm it). */
gpg_error_t
gpgsm_agent_ask_passphrase (ctrl_t ctrl, const char *desc_msg, int repeat,
char **r_passphrase)
{
gpg_error_t err;
char line[ASSUAN_LINELENGTH];
char *arg4 = NULL;
membuf_t data;
struct default_inq_parm_s inq_parm;
*r_passphrase = NULL;
err = start_agent (ctrl);
if (err)
return err;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
if (desc_msg && *desc_msg && !(arg4 = percent_plus_escape (desc_msg)))
return gpg_error_from_syserror ();
snprintf (line, DIM(line), "GET_PASSPHRASE --data%s -- X X X %s",
repeat? " --repeat=1 --check --qualitybar":"",
arg4);
xfree (arg4);
init_membuf_secure (&data, 64);
err = assuan_transact (agent_ctx, line,
put_membuf_cb, &data,
default_inq_cb, &inq_parm, NULL, NULL);
if (err)
xfree (get_membuf (&data, NULL));
else
{
put_membuf (&data, "", 1);
*r_passphrase = get_membuf (&data, NULL);
if (!*r_passphrase)
err = gpg_error_from_syserror ();
}
return err;
}
/* Retrieve a key encryption key from the agent. With FOREXPORT true
the key shall be use for export, with false for import. On success
the new key is stored at R_KEY and its length at R_KEKLEN. */
gpg_error_t
gpgsm_agent_keywrap_key (ctrl_t ctrl, int forexport,
void **r_kek, size_t *r_keklen)
{
gpg_error_t err;
membuf_t data;
size_t len;
unsigned char *buf;
char line[ASSUAN_LINELENGTH];
struct default_inq_parm_s inq_parm;
*r_kek = NULL;
err = start_agent (ctrl);
if (err)
return err;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
snprintf (line, DIM(line), "KEYWRAP_KEY %s",
forexport? "--export":"--import");
init_membuf_secure (&data, 64);
err = assuan_transact (agent_ctx, line,
put_membuf_cb, &data,
default_inq_cb, &inq_parm, NULL, NULL);
if (err)
{
xfree (get_membuf (&data, &len));
return err;
}
buf = get_membuf (&data, &len);
if (!buf)
return gpg_error_from_syserror ();
*r_kek = buf;
*r_keklen = len;
return 0;
}
/* Handle the inquiry for an IMPORT_KEY command. */
static gpg_error_t
inq_import_key_parms (void *opaque, const char *line)
{
struct import_key_parm_s *parm = opaque;
gpg_error_t err;
if (has_leading_keyword (line, "KEYDATA"))
{
assuan_begin_confidential (parm->ctx);
err = assuan_send_data (parm->ctx, parm->key, parm->keylen);
assuan_end_confidential (parm->ctx);
}
else
{
struct default_inq_parm_s inq_parm = { parm->ctrl, parm->ctx };
err = default_inq_cb (&inq_parm, line);
}
return err;
}
/* Call the agent to import a key into the agent. */
gpg_error_t
gpgsm_agent_import_key (ctrl_t ctrl, const void *key, size_t keylen)
{
gpg_error_t err;
struct import_key_parm_s parm;
err = start_agent (ctrl);
if (err)
return err;
parm.ctrl = ctrl;
parm.ctx = agent_ctx;
parm.key = key;
parm.keylen = keylen;
err = assuan_transact (agent_ctx, "IMPORT_KEY",
NULL, NULL, inq_import_key_parms, &parm, NULL, NULL);
return err;
}
/* Receive a secret key from the agent. KEYGRIP is the hexified
keygrip, DESC a prompt to be displayed with the agent's passphrase
question (needs to be plus+percent escaped). On success the key is
stored as a canonical S-expression at R_RESULT and R_RESULTLEN. */
gpg_error_t
gpgsm_agent_export_key (ctrl_t ctrl, const char *keygrip, const char *desc,
unsigned char **r_result, size_t *r_resultlen)
{
gpg_error_t err;
membuf_t data;
size_t len;
unsigned char *buf;
char line[ASSUAN_LINELENGTH];
struct default_inq_parm_s inq_parm;
*r_result = NULL;
err = start_agent (ctrl);
if (err)
return err;
inq_parm.ctrl = ctrl;
inq_parm.ctx = agent_ctx;
if (desc)
{
snprintf (line, DIM(line), "SETKEYDESC %s", desc);
err = assuan_transact (agent_ctx, line,
NULL, NULL, NULL, NULL, NULL, NULL);
if (err)
return err;
}
snprintf (line, DIM(line), "EXPORT_KEY %s", keygrip);
init_membuf_secure (&data, 1024);
err = assuan_transact (agent_ctx, line,
put_membuf_cb, &data,
default_inq_cb, &inq_parm, NULL, NULL);
if (err)
{
xfree (get_membuf (&data, &len));
return err;
}
buf = get_membuf (&data, &len);
if (!buf)
return gpg_error_from_syserror ();
*r_result = buf;
*r_resultlen = len;
return 0;
}
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