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gnupg/agent/learncard.c

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/* learncard.c - Handle the LEARN command
* Copyright (C) 2002, 2003, 2004, 2009 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/stat.h>
#include "agent.h"
#include <assuan.h>
/* Structures used by the callback mechanism to convey information
pertaining to key pairs. */
struct keypair_info_s
{
struct keypair_info_s *next;
int no_cert;
char *id; /* points into grip */
char hexgrip[1]; /* The keygrip (i.e. a hash over the public key
parameters) formatted as a hex string.
Allocated somewhat large to also act as
memory for the above ID field. */
};
typedef struct keypair_info_s *KEYPAIR_INFO;
struct kpinfo_cb_parm_s
{
ctrl_t ctrl;
int error;
KEYPAIR_INFO info;
};
/* Structures used by the callback mechanism to convey information
pertaining to certificates. */
struct certinfo_s {
struct certinfo_s *next;
int type;
int done;
char id[1];
};
typedef struct certinfo_s *CERTINFO;
struct certinfo_cb_parm_s
{
ctrl_t ctrl;
int error;
CERTINFO info;
};
/* Structures used by the callback mechanism to convey assuan status
lines. */
struct sinfo_s {
struct sinfo_s *next;
char *data; /* Points into keyword. */
char keyword[1];
};
typedef struct sinfo_s *SINFO;
struct sinfo_cb_parm_s {
int error;
SINFO info;
};
/* Destructor for key information objects. */
static void
release_keypair_info (KEYPAIR_INFO info)
{
while (info)
{
KEYPAIR_INFO tmp = info->next;
xfree (info);
info = tmp;
}
}
/* Destructor for certificate information objects. */
static void
release_certinfo (CERTINFO info)
{
while (info)
{
CERTINFO tmp = info->next;
xfree (info);
info = tmp;
}
}
/* Destructor for status information objects. */
static void
release_sinfo (SINFO info)
{
while (info)
{
SINFO tmp = info->next;
xfree (info);
info = tmp;
}
}
/* This callback is used by agent_card_learn and passed the content of
all KEYPAIRINFO lines. It merely stores this data away */
static void
kpinfo_cb (void *opaque, const char *line)
{
struct kpinfo_cb_parm_s *parm = opaque;
KEYPAIR_INFO item;
char *p;
if (parm->error)
return; /* no need to gather data after an error occurred */
if ((parm->error = agent_write_status (parm->ctrl, "PROGRESS",
"learncard", "k", "0", "0", NULL)))
return;
item = xtrycalloc (1, sizeof *item + strlen (line));
if (!item)
{
parm->error = out_of_core ();
return;
}
strcpy (item->hexgrip, line);
for (p = item->hexgrip; hexdigitp (p); p++)
;
if (p == item->hexgrip && *p == 'X' && spacep (p+1))
{
item->no_cert = 1;
p++;
}
else if ((p - item->hexgrip) != 40 || !spacep (p))
{ /* not a 20 byte hex keygrip or not followed by a space */
parm->error = gpg_error (GPG_ERR_INV_RESPONSE);
xfree (item);
return;
}
*p++ = 0;
while (spacep (p))
p++;
item->id = p;
while (*p && !spacep (p))
p++;
if (p == item->id)
{ /* invalid ID string */
parm->error = gpg_error (GPG_ERR_INV_RESPONSE);
xfree (item);
return;
}
*p = 0; /* ignore trailing stuff */
/* store it */
item->next = parm->info;
parm->info = item;
}
/* This callback is used by agent_card_learn and passed the content of
all CERTINFO lines. It merely stores this data away */
static void
certinfo_cb (void *opaque, const char *line)
{
struct certinfo_cb_parm_s *parm = opaque;
CERTINFO item;
int type;
char *p, *pend;
if (parm->error)
return; /* no need to gather data after an error occurred */
if ((parm->error = agent_write_status (parm->ctrl, "PROGRESS",
"learncard", "c", "0", "0", NULL)))
return;
type = strtol (line, &p, 10);
while (spacep (p))
p++;
for (pend = p; *pend && !spacep (pend); pend++)
;
if (p == pend || !*p)
{
parm->error = gpg_error (GPG_ERR_INV_RESPONSE);
return;
}
*pend = 0; /* ignore trailing stuff */
item = xtrycalloc (1, sizeof *item + strlen (p));
if (!item)
{
parm->error = out_of_core ();
return;
}
item->type = type;
strcpy (item->id, p);
/* store it */
item->next = parm->info;
parm->info = item;
}
/* This callback is used by agent_card_learn and passed the content of
all SINFO lines. It merely stores this data away */
static void
sinfo_cb (void *opaque, const char *keyword, size_t keywordlen,
const char *data)
{
struct sinfo_cb_parm_s *sparm = opaque;
SINFO item;
if (sparm->error)
return; /* no need to gather data after an error occurred */
item = xtrycalloc (1, sizeof *item + keywordlen + 1 + strlen (data));
if (!item)
{
sparm->error = out_of_core ();
return;
}
memcpy (item->keyword, keyword, keywordlen);
item->data = item->keyword + keywordlen;
*item->data = 0;
item->data++;
strcpy (item->data, data);
/* store it */
item->next = sparm->info;
sparm->info = item;
}
static int
send_cert_back (ctrl_t ctrl, const char *id, void *assuan_context)
{
int rc;
char *derbuf;
size_t derbuflen;
rc = agent_card_readcert (ctrl, id, &derbuf, &derbuflen);
if (rc)
{
const char *action;
switch (gpg_err_code (rc))
{
case GPG_ERR_INV_ID:
case GPG_ERR_NOT_FOUND:
action = " - ignored";
break;
default:
action = "";
break;
}
if (opt.verbose || !*action)
log_info ("error reading certificate '%s': %s%s\n",
id? id:"?", gpg_strerror (rc), action);
return *action? 0 : rc;
}
rc = assuan_send_data (assuan_context, derbuf, derbuflen);
xfree (derbuf);
if (!rc)
rc = assuan_send_data (assuan_context, NULL, 0);
if (!rc)
rc = assuan_write_line (assuan_context, "END");
if (rc)
{
log_error ("sending certificate failed: %s\n",
gpg_strerror (rc));
return rc;
}
return 0;
}
/* Perform the learn operation. If ASSUAN_CONTEXT is not NULL and
SEND is true all new certificates are send back via Assuan. */
int
agent_handle_learn (ctrl_t ctrl, int send, void *assuan_context, int force)
{
int rc;
struct kpinfo_cb_parm_s parm;
struct certinfo_cb_parm_s cparm;
struct sinfo_cb_parm_s sparm;
const char *serialno = NULL;
KEYPAIR_INFO item;
SINFO sitem;
unsigned char grip[20];
char *p;
int i;
static int certtype_list[] = {
111, /* Root CA */
101, /* trusted */
102, /* useful */
100, /* regular */
/* We don't include 110 here because gpgsm can't handle that
special root CA format. */
-1 /* end of list */
};
memset (&parm, 0, sizeof parm);
memset (&cparm, 0, sizeof cparm);
memset (&sparm, 0, sizeof sparm);
parm.ctrl = ctrl;
cparm.ctrl = ctrl;
/* Now gather all the available info. */
rc = agent_card_learn (ctrl, kpinfo_cb, &parm, certinfo_cb, &cparm,
sinfo_cb, &sparm);
if (!rc && (parm.error || cparm.error || sparm.error))
rc = parm.error? parm.error : cparm.error? cparm.error : sparm.error;
if (rc)
{
log_debug ("agent_card_learn failed: %s\n", gpg_strerror (rc));
goto leave;
}
/* Pass on all the collected status information. */
for (sitem = sparm.info; sitem; sitem = sitem->next)
{
if (!strcmp (sitem->keyword, "SERIALNO"))
serialno = sitem->data;
if (assuan_context)
assuan_write_status (assuan_context, sitem->keyword, sitem->data);
}
if (!serialno)
{
rc = GPG_ERR_NOT_FOUND;
goto leave;
}
log_info ("card has S/N: %s\n", serialno);
/* Write out the certificates in a standard order. */
for (i=0; certtype_list[i] != -1; i++)
{
CERTINFO citem;
for (citem = cparm.info; citem; citem = citem->next)
{
if (certtype_list[i] != citem->type)
continue;
if (opt.verbose)
log_info (" id: %s (type=%d)\n",
citem->id, citem->type);
if (assuan_context && send)
{
rc = send_cert_back (ctrl, citem->id, assuan_context);
if (rc)
goto leave;
citem->done = 1;
}
}
}
for (item = parm.info; item; item = item->next)
{
unsigned char *pubkey;
if (opt.verbose)
log_info (" id: %s (grip=%s)\n", item->id, item->hexgrip);
if (item->no_cert)
continue; /* No public key yet available. */
if (assuan_context)
{
agent_write_status (ctrl, "KEYPAIRINFO",
item->hexgrip, item->id, NULL);
}
for (p=item->hexgrip, i=0; i < 20; p += 2, i++)
grip[i] = xtoi_2 (p);
if (!force && !agent_key_available (ctrl, grip))
continue; /* The key is already available. */
/* Unknown key - store it. */
rc = agent_card_readkey (ctrl, item->id, &pubkey, NULL);
if (rc)
{
log_debug ("agent_card_readkey failed: %s\n", gpg_strerror (rc));
goto leave;
}
if (!ctrl->ephemeral_mode)
{
char *dispserialno;
agent_card_getattr (ctrl, "$DISPSERIALNO", &dispserialno,
item->hexgrip);
rc = agent_write_shadow_key (ctrl,
grip, serialno, item->id, pubkey, force,
dispserialno);
xfree (dispserialno);
}
xfree (pubkey);
if (rc)
goto leave;
if (opt.verbose)
log_info (" id: %s - shadow key created\n", item->id);
if (assuan_context && send)
{
CERTINFO citem;
/* only send the certificate if we have not done so before */
for (citem = cparm.info; citem; citem = citem->next)
{
if (!strcmp (citem->id, item->id))
break;
}
if (!citem)
{
rc = send_cert_back (ctrl, item->id, assuan_context);
if (rc)
goto leave;
}
}
}
leave:
release_keypair_info (parm.info);
release_certinfo (cparm.info);
release_sinfo (sparm.info);
return rc;
}
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