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#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include "agent.h"
#include <assuan.h>
#include "../common/strlist.h"
#include "../common/sexp-parse.h"
#include "../common/i18n.h"
static int
start_tpm2d (ctrl_t ctrl)
{
return daemon_start (DAEMON_TPM2D, ctrl, 0);
}
static int
unlock_tpm2d (ctrl_t ctrl, gpg_error_t err)
{
return daemon_unlock (DAEMON_TPM2D, ctrl, err);
}
static assuan_context_t
daemon_ctx (ctrl_t ctrl)
{
return daemon_type_ctx (DAEMON_TPM2D, ctrl);
}
struct inq_parm_s {
assuan_context_t ctx;
gpg_error_t (*getpin_cb)(ctrl_t, const char *, char **);
ctrl_t ctrl;
/* The next fields are used by inq_keydata. */
const unsigned char *keydata;
size_t keydatalen;
/* following only used by inq_extra */
const unsigned char *extra;
size_t extralen;
char *pin;
};
static gpg_error_t
inq_needpin (void *opaque, const char *line)
{
struct inq_parm_s *parm = opaque;
char *pin = NULL;
gpg_error_t rc;
const char *s;
if ((s = has_leading_keyword (line, "NEEDPIN")))
{
rc = parm->getpin_cb (parm->ctrl, s, &pin);
if (!rc)
rc = assuan_send_data (parm->ctx, pin, strlen(pin));
parm->pin = pin;
}
else
{
log_error ("unsupported inquiry '%s'\n", line);
rc = gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
}
return rc;
}
static gpg_error_t
inq_keydata (void *opaque, const char *line)
{
struct inq_parm_s *parm = opaque;
if (has_leading_keyword (line, "KEYDATA"))
return assuan_send_data (parm->ctx, parm->keydata, parm->keydatalen);
else
return inq_needpin (opaque, line);
}
static gpg_error_t
inq_extra (void *opaque, const char *line)
{
struct inq_parm_s *parm = opaque;
if (has_leading_keyword (line, "EXTRA"))
return assuan_send_data (parm->ctx, parm->extra, parm->extralen);
else
return inq_keydata (opaque, line);
}
int
agent_tpm2d_writekey (ctrl_t ctrl, unsigned char **shadow_info,
gcry_sexp_t s_skey)
{
int rc;
char line[ASSUAN_LINELENGTH];
size_t n;
unsigned char *kbuf;
membuf_t data;
struct inq_parm_s inqparm;
size_t len;
rc = start_tpm2d (ctrl);
if (rc)
return rc;
/* note: returned data is TPM protected so no need for a sensitive context */
init_membuf(&data, 4096);
inqparm.ctx = daemon_ctx (ctrl);
inqparm.getpin_cb = agent_ask_new_passphrase;
inqparm.ctrl = ctrl;
inqparm.pin = NULL;
n = gcry_sexp_sprint (s_skey, GCRYSEXP_FMT_CANON, NULL, 0);
kbuf = xtrymalloc (n);
gcry_sexp_sprint (s_skey, GCRYSEXP_FMT_CANON, kbuf, n);
inqparm.keydata = kbuf;
inqparm.keydatalen = n;
snprintf(line, sizeof(line), "IMPORT");
rc = assuan_transact (daemon_ctx (ctrl), line,
put_membuf_cb, &data,
inq_keydata, &inqparm,
NULL, NULL);
xfree (kbuf);
xfree (inqparm.pin);
if (rc)
{
xfree (get_membuf (&data, &len));
return unlock_tpm2d (ctrl, rc);
}
*shadow_info = get_membuf (&data, &len);
return unlock_tpm2d (ctrl, 0);
}
static gpg_error_t
pin_cb (ctrl_t ctrl, const char *prompt, char **passphrase)
{
char hexgrip[2*KEYGRIP_LEN + 1];
bin2hex (ctrl->keygrip, KEYGRIP_LEN, hexgrip);
*passphrase = agent_get_cache (ctrl, hexgrip, CACHE_MODE_USER);
if (*passphrase)
return 0;
return agent_get_passphrase(ctrl, passphrase,
_("Please enter your passphrase, so that the "
"secret key can be unlocked for this session"),
prompt, NULL, 0,
hexgrip, CACHE_MODE_USER, NULL);
}
int
agent_tpm2d_pksign (ctrl_t ctrl, const unsigned char *digest,
size_t digestlen, const unsigned char *shadow_info,
unsigned char **r_sig, size_t *r_siglen)
{
int rc;
char line[ASSUAN_LINELENGTH];
membuf_t data;
struct inq_parm_s inqparm;
char hexgrip[2*KEYGRIP_LEN + 1];
rc = start_tpm2d (ctrl);
if (rc)
return rc;
init_membuf (&data, 1024);
inqparm.ctx = daemon_ctx (ctrl);
inqparm.getpin_cb = pin_cb;
inqparm.ctrl = ctrl;
inqparm.keydata = shadow_info;
inqparm.keydatalen = gcry_sexp_canon_len (shadow_info, 0, NULL, NULL);
inqparm.extra = digest;
inqparm.extralen = digestlen;
inqparm.pin = NULL;
snprintf(line, sizeof(line), "PKSIGN");
rc = assuan_transact (daemon_ctx (ctrl), line,
put_membuf_cb, &data,
inq_extra, &inqparm,
NULL, NULL);
if (!rc)
{
bin2hex (ctrl->keygrip, KEYGRIP_LEN, hexgrip);
agent_put_cache (ctrl, hexgrip, CACHE_MODE_USER, inqparm.pin, 0);
}
xfree (inqparm.pin);
if (rc)
{
size_t len;
xfree (get_membuf (&data, &len));
return unlock_tpm2d (ctrl, rc);
}
*r_sig = get_membuf (&data, r_siglen);
return unlock_tpm2d (ctrl, 0);
}
int
agent_tpm2d_pkdecrypt (ctrl_t ctrl, const unsigned char *cipher,
size_t cipherlen, const unsigned char *shadow_info,
char **r_buf, size_t *r_len)
{
int rc;
char line[ASSUAN_LINELENGTH];
membuf_t data;
struct inq_parm_s inqparm;
char hexgrip[2*KEYGRIP_LEN + 1];
rc = start_tpm2d (ctrl);
if (rc)
return rc;
init_membuf (&data, 1024);
inqparm.ctx = daemon_ctx (ctrl);
inqparm.getpin_cb = pin_cb;
inqparm.ctrl = ctrl;
inqparm.keydata = shadow_info;
inqparm.keydatalen = gcry_sexp_canon_len (shadow_info, 0, NULL, NULL);
inqparm.extra = cipher;
inqparm.extralen = cipherlen;
inqparm.pin = NULL;
snprintf(line, sizeof(line), "PKDECRYPT");
rc = assuan_transact (daemon_ctx (ctrl), line,
put_membuf_cb, &data,
inq_extra, &inqparm,
NULL, NULL);
if (!rc)
{
bin2hex (ctrl->keygrip, KEYGRIP_LEN, hexgrip);
agent_put_cache (ctrl, hexgrip, CACHE_MODE_USER, inqparm.pin, 0);
}
xfree (inqparm.pin);
if (rc)
{
size_t len;
xfree (get_membuf (&data, &len));
return unlock_tpm2d (ctrl, rc);
}
*r_buf = get_membuf (&data, r_len);
return unlock_tpm2d (ctrl, 0);
}
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