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gnupg/agent/call-scd.c
Marcus Brinkmann 3974488cd1 2009-09-23 Marcus Brinkmann <marcus@g10code.de>
* configure.ac (NEED_LIBASSUAN_API, NEED_LIBASSUAN_VERSION):
	Update to new API (2, 1.1.0).

agent/
2009-09-23  Marcus Brinkmann  <marcus@g10code.de>

	* gpg-agent.c (parse_rereadable_options): Don't set global assuan
	log file (there ain't one anymore).
	(main): Update to new API.
	(check_own_socket_pid_cb): Return gpg_error_t instead of int.
	(check_own_socket_thread, check_for_running_agent): Create assuan
	context before connecting to server.
	* command.c: Include "scdaemon.h" before <assuan.h> because of
	GPG_ERR_SOURCE_DEFAULT check.
	(write_and_clear_outbuf): Use gpg_error_t instead of
	assuan_error_t.
	(cmd_geteventcounter, cmd_istrusted, cmd_listtrusted)
	(cmd_marktrusted, cmd_havekey, cmd_sigkey, cmd_setkeydesc)
	(cmd_sethash, cmd_pksign, cmd_pkdecrypt, cmd_genkey, cmd_readkey)
	(cmd_keyinfo, cmd_get_passphrase, cmd_clear_passphrase)
	(cmd_get_confirmation, cmd_learn, cmd_passwd)
	(cmd_preset_passphrase, cmd_scd, cmd_getval, cmd_putval)
	(cmd_updatestartuptty, cmd_killagent, cmd_reloadagent)
	(cmd_getinfo, option_handler): Return gpg_error_t instead of int.
	(post_cmd_notify): Change type of ERR to gpg_error_t from int.
	(io_monitor): Add hook argument.  Use symbols for constants.
	(register_commands): Change return type of HANDLER to gpg_error_t.
	(start_command_handler): Allocate assuan context before starting
	server.
	* call-pinentry.c: Include "scdaemon.h" before <assuan.h> because
	of GPG_ERR_SOURCE_DEFAULT check.
	(unlock_pinentry): Call assuan_release instead of
	assuan_disconnect.
	(getinfo_pid_cb, getpin_cb): Return gpg_error_t instead of int.
	(start_pinentry): Allocate assuan context before connecting to
	server.
	* call-scd.c (membuf_data_cb, learn_status_cb, get_serialno_cb)
	(membuf_data_cb, inq_needpin, card_getattr_cb, pass_status_thru)
	(pass_data_thru): Change return type to gpg_error_t.
	(start_scd): Allocate assuan context before connecting to server.

common/
2009-09-23  Marcus Brinkmann  <marcus@g10code.de>

	* asshelp.c (start_new_gpg_agent): Allocate assuan context before
	starting server.

g10/
2009-09-23  Marcus Brinkmann  <marcus@g10code.de>

	* call-agent.c: Include "scdaemon.h" before <assuan.h> because of
	GPG_ERR_SOURCE_DEFAULT check.
	(learn_status_cb, dummy_data_cb, get_serialno_cb, default_inq_cb)
	(learn_status_cb, inq_writecert_parms, inq_writekey_parms)
	(scd_genkey_cb, membuf_data_cb): Return gpg_error_t instead of
	int.
	* gpg.c: Include "scdaemon.h" before <assuan.h> because of
	GPG_ERR_SOURCE_DEFAULT check.
	(main): Update to new Assuan API.
	* server.c: Include "scdaemon.h" before <assuan.h> because of
	GPG_ERR_SOURCE_DEFAULT check.
	(option_handler, cmd_recipient, cmd_signer, cmd_encrypt)
	(cmd_decrypt, cmd_verify, cmd_sign, cmd_import, cmd_export)
	(cmd_delkeys, cmd_message, do_listkeys, cmd_listkeys)
	(cmd_listsecretkeys, cmd_genkey, cmd_getinfo): Return gpg_error_t
	instead of int.
	(register_commands): Allocate assuan context before starting
	server.
	(gpg_server): Allocate assuan_context before starting server.

scd/
2009-09-23  Marcus Brinkmann  <marcus@g10code.de>

	* command.c: Include "scdaemon.h" before <assuan.h> because of
	GPG_ERR_SOURCE_DEFAULT check.
	(option_handler, open_card, cmd_serialno, cmd_lean, cmd_readcert)
	(cmd_readkey, cmd_setdata, cmd_pksign, cmd_pkauth, cmd_pkdecrypt)
	(cmd_getattr, cmd_setattr, cmd_writecert, cmd_writekey)
	(cmd_genkey, cmd_random, cmd_passwd, cmd_checkpin, cmd_lock)
	(cmd_unlock, cmd_getinfo, cmd_restart, cmd_disconnect, cmd_apdu)
	(cmd_killscd): Return gpg_error_t instead of int.
	(scd_command_handler): Allocate assuan context before starting server.
	* scdaemon.c (main): Update to new Assuan API.

sm/
2009-09-23  Marcus Brinkmann  <marcus@g10code.de>

	* gpgsm.c (main): Update to new assuan API.
	* server.c: Include "gpgsm.h" before <assuan.h> due to check for
	GPG_ERR_SOURCE_DEFAULT and assuan.h now including gpg-error.h.
	(option_handler, cmd_recipient, cmd_signer, cmd_encrypt)
	(cmd_decrypt, cmd_verify, cmd_sign, cmd_import, cmd_export)
	(cmd_delkeys, cmd_message, cmd_listkeys, cmd_dumpkeys)
	(cmd_listsecretkeys, cmd_dumpsecretkeys, cmd_genkey)
	(cmd_getauditlog, cmd_getinfo): Return gpg_error_t instead of int.
	(register_commands): Same for member HANDLER in table.
	(gpgsm_server): Allocate assuan context before starting server.
	* sm/call-dirmngr.c:
	* call-dirmngr.c (prepare_dirmngr): Check for CTX and error before
	setting LDAPSERVER.
	(start_dirmngr_ext): Allocate assuan context before starting
	server.
	(inq_certificate, isvalid_status_cb, lookup_cb, lookup_status_cb)
	(run_command_cb, run_command_inq_cb, run_command_status_cb):
	Return gpg_error_t instead of int.

tools/
2009-09-23  Marcus Brinkmann  <marcus@g10code.de>

	* gpg-connect-agent.c (getinfo_pid_cb, read_and_print_response)
	(main): Update to new Assuan API.
2009-09-23 00:01:25 +00:00

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/* call-scd.c - fork of the scdaemon to do SC operations
* Copyright (C) 2001, 2002, 2005, 2007 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 <http://www.gnu.org/licenses/>.
*/
#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 <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifndef HAVE_W32_SYSTEM
#include <sys/wait.h>
#endif
#include <pth.h>
#include "agent.h"
#include <assuan.h>
#ifdef _POSIX_OPEN_MAX
#define MAX_OPEN_FDS _POSIX_OPEN_MAX
#else
#define MAX_OPEN_FDS 20
#endif
/* Definition of module local data of the CTRL structure. */
struct scd_local_s
{
/* We keep a list of all allocated context with a an achnor at
SCD_LOCAL_LIST (see below). */
struct scd_local_s *next_local;
/* We need to get back to the ctrl object actually referencing this
structure. This is really an awkward way of enumerint the lcoal
contects. A much cleaner way would be to keep a global list of
ctrl objects to enumerate them. */
ctrl_t ctrl_backlink;
assuan_context_t ctx; /* NULL or session context for the SCdaemon
used with this connection. */
int locked; /* This flag is used to assert proper use of
start_scd and unlock_scd. */
};
/* Callback parameter for learn card */
struct learn_parm_s
{
void (*kpinfo_cb)(void*, const char *);
void *kpinfo_cb_arg;
void (*certinfo_cb)(void*, const char *);
void *certinfo_cb_arg;
void (*sinfo_cb)(void*, const char *, size_t, const char *);
void *sinfo_cb_arg;
};
struct inq_needpin_s
{
assuan_context_t ctx;
int (*getpin_cb)(void *, const char *, char*, size_t);
void *getpin_cb_arg;
assuan_context_t passthru; /* If not NULL, pass unknown inquiries
up to the caller. */
};
/* To keep track of all active SCD contexts, we keep a linked list
anchored at this variable. */
static struct scd_local_s *scd_local_list;
/* A Mutex used inside the start_scd function. */
static pth_mutex_t start_scd_lock;
/* A malloced string with the name of the socket to be used for
additional connections. May be NULL if not provided by
SCdaemon. */
static char *socket_name;
/* The context of the primary connection. This is also used as a flag
to indicate whether the scdaemon has been started. */
static assuan_context_t primary_scd_ctx;
/* To allow reuse of the primary connection, the following flag is set
to true if the primary context has been reset and is not in use by
any connection. */
static int primary_scd_ctx_reusable;
/* Local prototypes. */
static gpg_error_t membuf_data_cb (void *opaque,
const void *buffer, size_t length);
/* This function must be called once to initialize this module. This
has to be done before a second thread is spawned. We can't do the
static initialization because Pth emulation code might not be able
to do a static init; in particular, it is not possible for W32. */
void
initialize_module_call_scd (void)
{
static int initialized;
if (!initialized)
{
if (!pth_mutex_init (&start_scd_lock))
log_fatal ("error initializing mutex: %s\n", strerror (errno));
initialized = 1;
}
}
static void
dump_mutex_state (pth_mutex_t *m)
{
#ifdef _W32_PTH_H
(void)m;
log_printf ("unknown under W32");
#else
if (!(m->mx_state & PTH_MUTEX_INITIALIZED))
log_printf ("not_initialized");
else if (!(m->mx_state & PTH_MUTEX_LOCKED))
log_printf ("not_locked");
else
log_printf ("locked tid=0x%lx count=%lu", (long)m->mx_owner, m->mx_count);
#endif
}
/* This function may be called to print infromation pertaining to the
current state of this module to the log. */
void
agent_scd_dump_state (void)
{
log_info ("agent_scd_dump_state: scd_lock=");
dump_mutex_state (&start_scd_lock);
log_printf ("\n");
log_info ("agent_scd_dump_state: primary_scd_ctx=%p pid=%ld reusable=%d\n",
primary_scd_ctx,
(long)assuan_get_pid (primary_scd_ctx),
primary_scd_ctx_reusable);
if (socket_name)
log_info ("agent_scd_dump_state: socket=`%s'\n", socket_name);
}
/* The unlock_scd function shall be called after having accessed the
SCD. It is currently not very useful but gives an opportunity to
keep track of connections currently calling SCD. Note that the
"lock" operation is done by the start_scd() function which must be
called and error checked before any SCD operation. CTRL is the
usual connection context and RC the error code to be passed trhough
the function. */
static int
unlock_scd (ctrl_t ctrl, int rc)
{
if (ctrl->scd_local->locked != 1)
{
log_error ("unlock_scd: invalid lock count (%d)\n",
ctrl->scd_local->locked);
if (!rc)
rc = gpg_error (GPG_ERR_INTERNAL);
}
ctrl->scd_local->locked = 0;
return rc;
}
/* To make sure we leave no secrets in our image after forking of the
scdaemon, we use this callback. */
static void
atfork_cb (void *opaque, int where)
{
(void)opaque;
if (!where)
gcry_control (GCRYCTL_TERM_SECMEM);
}
/* Fork off the SCdaemon if this has not already been done. Lock the
daemon and make sure that a proper context has been setup in CTRL.
This function might also lock the daemon, which means that the
caller must call unlock_scd after this fucntion has returned
success and the actual Assuan transaction been done. */
static int
start_scd (ctrl_t ctrl)
{
gpg_error_t err = 0;
const char *pgmname;
assuan_context_t ctx = NULL;
const char *argv[3];
int no_close_list[3];
int i;
int rc;
if (opt.disable_scdaemon)
return gpg_error (GPG_ERR_NOT_SUPPORTED);
/* If this is the first call for this session, setup the local data
structure. */
if (!ctrl->scd_local)
{
ctrl->scd_local = xtrycalloc (1, sizeof *ctrl->scd_local);
if (!ctrl->scd_local)
return gpg_error_from_syserror ();
ctrl->scd_local->ctrl_backlink = ctrl;
ctrl->scd_local->next_local = scd_local_list;
scd_local_list = ctrl->scd_local;
}
/* Assert that the lock count is as expected. */
if (ctrl->scd_local->locked)
{
log_error ("start_scd: invalid lock count (%d)\n",
ctrl->scd_local->locked);
return gpg_error (GPG_ERR_INTERNAL);
}
ctrl->scd_local->locked++;
if (ctrl->scd_local->ctx)
return 0; /* Okay, the context is fine. We used to test for an
alive context here and do an disconnect. Now that we
have a ticker function to check for it, it is easier
not to check here but to let the connection run on an
error instead. */
/* We need to protect the following code. */
if (!pth_mutex_acquire (&start_scd_lock, 0, NULL))
{
log_error ("failed to acquire the start_scd lock: %s\n",
strerror (errno));
return gpg_error (GPG_ERR_INTERNAL);
}
/* Check whether the pipe server has already been started and in
this case either reuse a lingering pipe connection or establish a
new socket based one. */
if (primary_scd_ctx && primary_scd_ctx_reusable)
{
ctx = primary_scd_ctx;
primary_scd_ctx_reusable = 0;
if (opt.verbose)
log_info ("new connection to SCdaemon established (reusing)\n");
goto leave;
}
rc = assuan_new (&ctx);
if (rc)
{
log_error ("can't allocate assuan context: %s\n", gpg_strerror (rc));
err = rc;
goto leave;
}
if (socket_name)
{
rc = assuan_socket_connect (ctx, socket_name, 0);
if (rc)
{
log_error ("can't connect to socket `%s': %s\n",
socket_name, gpg_strerror (rc));
err = gpg_error (GPG_ERR_NO_SCDAEMON);
goto leave;
}
if (opt.verbose)
log_info ("new connection to SCdaemon established\n");
goto leave;
}
if (primary_scd_ctx)
{
log_info ("SCdaemon is running but won't accept further connections\n");
err = gpg_error (GPG_ERR_NO_SCDAEMON);
goto leave;
}
/* Nope, it has not been started. Fire it up now. */
if (opt.verbose)
log_info ("no running SCdaemon - starting it\n");
if (fflush (NULL))
{
#ifndef HAVE_W32_SYSTEM
err = gpg_error_from_syserror ();
#endif
log_error ("error flushing pending output: %s\n", strerror (errno));
/* At least Windows XP fails here with EBADF. According to docs
and Wine an fflush(NULL) is the same as _flushall. However
the Wime implementaion does not flush stdin,stdout and stderr
- see above. Lets try to ignore the error. */
#ifndef HAVE_W32_SYSTEM
goto leave;
#endif
}
if (!opt.scdaemon_program || !*opt.scdaemon_program)
opt.scdaemon_program = gnupg_module_name (GNUPG_MODULE_NAME_SCDAEMON);
if ( !(pgmname = strrchr (opt.scdaemon_program, '/')))
pgmname = opt.scdaemon_program;
else
pgmname++;
argv[0] = pgmname;
argv[1] = "--multi-server";
argv[2] = NULL;
i=0;
if (!opt.running_detached)
{
if (log_get_fd () != -1)
no_close_list[i++] = log_get_fd ();
no_close_list[i++] = fileno (stderr);
}
no_close_list[i] = -1;
/* Connect to the pinentry and perform initial handshaking. Use
detached flag (128) so that under W32 SCDAEMON does not show up a
new window. */
rc = assuan_pipe_connect_ext (ctx, opt.scdaemon_program, argv,
no_close_list, atfork_cb, NULL, 128);
if (rc)
{
log_error ("can't connect to the SCdaemon: %s\n",
gpg_strerror (rc));
err = gpg_error (GPG_ERR_NO_SCDAEMON);
goto leave;
}
if (opt.verbose)
log_debug ("first connection to SCdaemon established\n");
if (DBG_ASSUAN)
assuan_set_log_stream (ctx, log_get_stream ());
/* Get the name of the additional socket opened by scdaemon. */
{
membuf_t data;
unsigned char *databuf;
size_t datalen;
xfree (socket_name);
socket_name = NULL;
init_membuf (&data, 256);
assuan_transact (ctx, "GETINFO socket_name",
membuf_data_cb, &data, NULL, NULL, NULL, NULL);
databuf = get_membuf (&data, &datalen);
if (databuf && datalen)
{
socket_name = xtrymalloc (datalen + 1);
if (!socket_name)
log_error ("warning: can't store socket name: %s\n",
strerror (errno));
else
{
memcpy (socket_name, databuf, datalen);
socket_name[datalen] = 0;
if (DBG_ASSUAN)
log_debug ("additional connections at `%s'\n", socket_name);
}
}
xfree (databuf);
}
/* Tell the scdaemon we want him to send us an event signal. */
{
char buf[100];
#ifdef HAVE_W32_SYSTEM
snprintf (buf, sizeof buf, "OPTION event-signal=%lx",
(unsigned long)get_agent_scd_notify_event ());
#else
snprintf (buf, sizeof buf, "OPTION event-signal=%d", SIGUSR2);
#endif
assuan_transact (ctx, buf, NULL, NULL, NULL, NULL, NULL, NULL);
}
primary_scd_ctx = ctx;
primary_scd_ctx_reusable = 0;
leave:
if (err)
{
unlock_scd (ctrl, err);
if (ctx)
assuan_release (ctx);
}
else
{
ctrl->scd_local->ctx = ctx;
}
if (!pth_mutex_release (&start_scd_lock))
log_error ("failed to release the start_scd lock: %s\n", strerror (errno));
return err;
}
/* Check whether the SCdaemon is active. This is a fast check without
any locking and might give a wrong result if another thread is about
to start the daemon or the daemon is about to be stopped.. */
int
agent_scd_check_running (void)
{
return !!primary_scd_ctx;
}
/* Check whether the Scdaemon is still alive and clean it up if not. */
void
agent_scd_check_aliveness (void)
{
pth_event_t evt;
pid_t pid;
#ifdef HAVE_W32_SYSTEM
DWORD rc;
#else
int rc;
#endif
if (!primary_scd_ctx)
return; /* No scdaemon running. */
/* This is not a critical function so we use a short timeout while
acquiring the lock. */
evt = pth_event (PTH_EVENT_TIME, pth_timeout (1, 0));
if (!pth_mutex_acquire (&start_scd_lock, 0, evt))
{
if (pth_event_occurred (evt))
{
if (opt.verbose > 1)
log_info ("failed to acquire the start_scd lock while"
" doing an aliveness check: %s\n", "timeout");
}
else
log_error ("failed to acquire the start_scd lock while"
" doing an aliveness check: %s\n", strerror (errno));
pth_event_free (evt, PTH_FREE_THIS);
return;
}
pth_event_free (evt, PTH_FREE_THIS);
if (primary_scd_ctx)
{
pid = assuan_get_pid (primary_scd_ctx);
#ifdef HAVE_W32_SYSTEM
/* If we have a PID we disconnect if either GetExitProcessCode
fails or if ir returns the exit code of the scdaemon. 259 is
the error code for STILL_ALIVE. */
if (pid != (pid_t)(void*)(-1) && pid
&& (!GetExitCodeProcess ((HANDLE)pid, &rc) || rc != 259))
#else
if (pid != (pid_t)(-1) && pid
&& ((rc=waitpid (pid, NULL, WNOHANG))==-1 || (rc == pid)) )
#endif
{
/* Okay, scdaemon died. Disconnect the primary connection
now but take care that it won't do another wait. Also
cleanup all other connections and release their
resources. The next use will start a new daemon then.
Due to the use of the START_SCD_LOCAL we are sure that
none of these context are actually in use. */
struct scd_local_s *sl;
assuan_set_flag (primary_scd_ctx, ASSUAN_NO_WAITPID, 1);
assuan_release (primary_scd_ctx);
for (sl=scd_local_list; sl; sl = sl->next_local)
{
if (sl->ctx)
{
if (sl->ctx != primary_scd_ctx)
assuan_release (sl->ctx);
sl->ctx = NULL;
}
}
primary_scd_ctx = NULL;
primary_scd_ctx_reusable = 0;
xfree (socket_name);
socket_name = NULL;
}
}
if (!pth_mutex_release (&start_scd_lock))
log_error ("failed to release the start_scd lock while"
" doing the aliveness check: %s\n", strerror (errno));
}
/* Reset the SCD if it has been used. Actually it is not a reset but
a cleanup of resources used by the current connection. */
int
agent_reset_scd (ctrl_t ctrl)
{
if (ctrl->scd_local)
{
if (ctrl->scd_local->ctx)
{
/* We can't disconnect the primary context because libassuan
does a waitpid on it and thus the system would hang.
Instead we send a reset and keep that connection for
reuse. */
if (ctrl->scd_local->ctx == primary_scd_ctx)
{
/* Send a RESTART to the SCD. This is required for the
primary connection as a kind of virtual EOF; we don't
have another way to tell it that the next command
should be viewed as if a new connection has been
made. For the non-primary connections this is not
needed as we simply close the socket. We don't check
for an error here because the RESTART may fail for
example if the scdaemon has already been terminated.
Anyway, we need to set the reusable flag to make sure
that the aliveness check can clean it up. */
assuan_transact (primary_scd_ctx, "RESTART",
NULL, NULL, NULL, NULL, NULL, NULL);
primary_scd_ctx_reusable = 1;
}
else
assuan_release (ctrl->scd_local->ctx);
ctrl->scd_local->ctx = NULL;
}
/* Remove the local context from our list and release it. */
if (!scd_local_list)
BUG ();
else if (scd_local_list == ctrl->scd_local)
scd_local_list = ctrl->scd_local->next_local;
else
{
struct scd_local_s *sl;
for (sl=scd_local_list; sl->next_local; sl = sl->next_local)
if (sl->next_local == ctrl->scd_local)
break;
if (!sl->next_local)
BUG ();
sl->next_local = ctrl->scd_local->next_local;
}
xfree (ctrl->scd_local);
ctrl->scd_local = NULL;
}
return 0;
}
static gpg_error_t
learn_status_cb (void *opaque, const char *line)
{
struct learn_parm_s *parm = opaque;
const char *keyword = line;
int keywordlen;
for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
;
while (spacep (line))
line++;
if (keywordlen == 8 && !memcmp (keyword, "CERTINFO", keywordlen))
{
parm->certinfo_cb (parm->certinfo_cb_arg, line);
}
else if (keywordlen == 11 && !memcmp (keyword, "KEYPAIRINFO", keywordlen))
{
parm->kpinfo_cb (parm->kpinfo_cb_arg, line);
}
else if (keywordlen && *line)
{
parm->sinfo_cb (parm->sinfo_cb_arg, keyword, keywordlen, line);
}
return 0;
}
/* Perform the LEARN command and return a list of all private keys
stored on the card. */
int
agent_card_learn (ctrl_t ctrl,
void (*kpinfo_cb)(void*, const char *),
void *kpinfo_cb_arg,
void (*certinfo_cb)(void*, const char *),
void *certinfo_cb_arg,
void (*sinfo_cb)(void*, const char *, size_t, const char *),
void *sinfo_cb_arg)
{
int rc;
struct learn_parm_s parm;
rc = start_scd (ctrl);
if (rc)
return rc;
memset (&parm, 0, sizeof parm);
parm.kpinfo_cb = kpinfo_cb;
parm.kpinfo_cb_arg = kpinfo_cb_arg;
parm.certinfo_cb = certinfo_cb;
parm.certinfo_cb_arg = certinfo_cb_arg;
parm.sinfo_cb = sinfo_cb;
parm.sinfo_cb_arg = sinfo_cb_arg;
rc = assuan_transact (ctrl->scd_local->ctx, "LEARN --force",
NULL, NULL, NULL, NULL,
learn_status_cb, &parm);
if (rc)
return unlock_scd (ctrl, rc);
return unlock_scd (ctrl, 0);
}
static gpg_error_t
get_serialno_cb (void *opaque, const char *line)
{
char **serialno = opaque;
const char *keyword = line;
const char *s;
int keywordlen, n;
for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
;
while (spacep (line))
line++;
if (keywordlen == 8 && !memcmp (keyword, "SERIALNO", keywordlen))
{
if (*serialno)
return gpg_error (GPG_ERR_CONFLICT); /* Unexpected status line. */
for (n=0,s=line; hexdigitp (s); s++, n++)
;
if (!n || (n&1)|| !(spacep (s) || !*s) )
return gpg_error (GPG_ERR_ASS_PARAMETER);
*serialno = xtrymalloc (n+1);
if (!*serialno)
return out_of_core ();
memcpy (*serialno, line, n);
(*serialno)[n] = 0;
}
return 0;
}
/* Return the serial number of the card or an appropriate error. The
serial number is returned as a hexstring. */
int
agent_card_serialno (ctrl_t ctrl, char **r_serialno)
{
int rc;
char *serialno = NULL;
rc = start_scd (ctrl);
if (rc)
return rc;
rc = assuan_transact (ctrl->scd_local->ctx, "SERIALNO",
NULL, NULL, NULL, NULL,
get_serialno_cb, &serialno);
if (rc)
{
xfree (serialno);
return unlock_scd (ctrl, rc);
}
*r_serialno = serialno;
return unlock_scd (ctrl, 0);
}
static gpg_error_t
membuf_data_cb (void *opaque, const void *buffer, size_t length)
{
membuf_t *data = opaque;
if (buffer)
put_membuf (data, buffer, length);
return 0;
}
/* Handle the NEEDPIN inquiry. */
static gpg_error_t
inq_needpin (void *opaque, const char *line)
{
struct inq_needpin_s *parm = opaque;
char *pin;
size_t pinlen;
int rc;
if (!strncmp (line, "NEEDPIN", 7) && (line[7] == ' ' || !line[7]))
{
line += 7;
while (*line == ' ')
line++;
pinlen = 90;
pin = gcry_malloc_secure (pinlen);
if (!pin)
return out_of_core ();
rc = parm->getpin_cb (parm->getpin_cb_arg, line, pin, pinlen);
if (!rc)
rc = assuan_send_data (parm->ctx, pin, pinlen);
xfree (pin);
}
else if (!strncmp (line, "POPUPKEYPADPROMPT", 17)
&& (line[17] == ' ' || !line[17]))
{
line += 17;
while (*line == ' ')
line++;
rc = parm->getpin_cb (parm->getpin_cb_arg, line, NULL, 1);
}
else if (!strncmp (line, "DISMISSKEYPADPROMPT", 19)
&& (line[19] == ' ' || !line[19]))
{
rc = parm->getpin_cb (parm->getpin_cb_arg, "", NULL, 0);
}
else if (parm->passthru)
{
unsigned char *value;
size_t valuelen;
int rest;
int needrest = !strncmp (line, "KEYDATA", 8);
/* Pass the inquiry up to our caller. We limit the maximum
amount to an arbitrary value. As we know that the KEYDATA
enquiry is pretty sensitive we disable logging then */
if ((rest = (needrest
&& !assuan_get_flag (parm->passthru, ASSUAN_CONFIDENTIAL))))
assuan_begin_confidential (parm->passthru);
rc = assuan_inquire (parm->passthru, line, &value, &valuelen, 8096);
if (rest)
assuan_end_confidential (parm->passthru);
if (!rc)
{
if ((rest = (needrest
&& !assuan_get_flag (parm->ctx, ASSUAN_CONFIDENTIAL))))
assuan_begin_confidential (parm->ctx);
rc = assuan_send_data (parm->ctx, value, valuelen);
if (rest)
assuan_end_confidential (parm->ctx);
xfree (value);
}
else
log_error ("error forwarding inquiry `%s': %s\n",
line, gpg_strerror (rc));
}
else
{
log_error ("unsupported inquiry `%s'\n", line);
rc = gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
}
return rc;
}
/* Create a signature using the current card */
int
agent_card_pksign (ctrl_t ctrl,
const char *keyid,
int (*getpin_cb)(void *, const char *, char*, size_t),
void *getpin_cb_arg,
const unsigned char *indata, size_t indatalen,
unsigned char **r_buf, size_t *r_buflen)
{
int rc, i;
char *p, line[ASSUAN_LINELENGTH];
membuf_t data;
struct inq_needpin_s inqparm;
size_t len;
unsigned char *sigbuf;
size_t sigbuflen;
*r_buf = NULL;
rc = start_scd (ctrl);
if (rc)
return rc;
if (indatalen*2 + 50 > DIM(line))
return unlock_scd (ctrl, gpg_error (GPG_ERR_GENERAL));
sprintf (line, "SETDATA ");
p = line + strlen (line);
for (i=0; i < indatalen ; i++, p += 2 )
sprintf (p, "%02X", indata[i]);
rc = assuan_transact (ctrl->scd_local->ctx, line,
NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return unlock_scd (ctrl, rc);
init_membuf (&data, 1024);
inqparm.ctx = ctrl->scd_local->ctx;
inqparm.getpin_cb = getpin_cb;
inqparm.getpin_cb_arg = getpin_cb_arg;
inqparm.passthru = 0;
snprintf (line, DIM(line)-1,
ctrl->use_auth_call? "PKAUTH %s":"PKSIGN %s", keyid);
line[DIM(line)-1] = 0;
rc = assuan_transact (ctrl->scd_local->ctx, line,
membuf_data_cb, &data,
inq_needpin, &inqparm,
NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return unlock_scd (ctrl, rc);
}
sigbuf = get_membuf (&data, &sigbuflen);
/* Create an S-expression from it which is formatted like this:
"(7:sig-val(3:rsa(1:sSIGBUFLEN:SIGBUF)))" */
*r_buflen = 21 + 11 + sigbuflen + 4;
p = xtrymalloc (*r_buflen);
*r_buf = (unsigned char*)p;
if (!p)
return unlock_scd (ctrl, out_of_core ());
p = stpcpy (p, "(7:sig-val(3:rsa(1:s" );
sprintf (p, "%u:", (unsigned int)sigbuflen);
p += strlen (p);
memcpy (p, sigbuf, sigbuflen);
p += sigbuflen;
strcpy (p, ")))");
xfree (sigbuf);
assert (gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL));
return unlock_scd (ctrl, 0);
}
/* Decipher INDATA using the current card. Note that the returned value is */
int
agent_card_pkdecrypt (ctrl_t ctrl,
const char *keyid,
int (*getpin_cb)(void *, const char *, char*, size_t),
void *getpin_cb_arg,
const unsigned char *indata, size_t indatalen,
char **r_buf, size_t *r_buflen)
{
int rc, i;
char *p, line[ASSUAN_LINELENGTH];
membuf_t data;
struct inq_needpin_s inqparm;
size_t len;
*r_buf = NULL;
rc = start_scd (ctrl);
if (rc)
return rc;
/* FIXME: use secure memory where appropriate */
if (indatalen*2 + 50 > DIM(line))
return unlock_scd (ctrl, gpg_error (GPG_ERR_GENERAL));
sprintf (line, "SETDATA ");
p = line + strlen (line);
for (i=0; i < indatalen ; i++, p += 2 )
sprintf (p, "%02X", indata[i]);
rc = assuan_transact (ctrl->scd_local->ctx, line,
NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return unlock_scd (ctrl, rc);
init_membuf (&data, 1024);
inqparm.ctx = ctrl->scd_local->ctx;
inqparm.getpin_cb = getpin_cb;
inqparm.getpin_cb_arg = getpin_cb_arg;
inqparm.passthru = 0;
snprintf (line, DIM(line)-1, "PKDECRYPT %s", keyid);
line[DIM(line)-1] = 0;
rc = assuan_transact (ctrl->scd_local->ctx, line,
membuf_data_cb, &data,
inq_needpin, &inqparm,
NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return unlock_scd (ctrl, rc);
}
*r_buf = get_membuf (&data, r_buflen);
if (!*r_buf)
return unlock_scd (ctrl, gpg_error (GPG_ERR_ENOMEM));
return unlock_scd (ctrl, 0);
}
/* Read a certificate with ID into R_BUF and R_BUFLEN. */
int
agent_card_readcert (ctrl_t ctrl,
const char *id, char **r_buf, size_t *r_buflen)
{
int rc;
char line[ASSUAN_LINELENGTH];
membuf_t data;
size_t len;
*r_buf = NULL;
rc = start_scd (ctrl);
if (rc)
return rc;
init_membuf (&data, 1024);
snprintf (line, DIM(line)-1, "READCERT %s", id);
line[DIM(line)-1] = 0;
rc = assuan_transact (ctrl->scd_local->ctx, line,
membuf_data_cb, &data,
NULL, NULL,
NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return unlock_scd (ctrl, rc);
}
*r_buf = get_membuf (&data, r_buflen);
if (!*r_buf)
return unlock_scd (ctrl, gpg_error (GPG_ERR_ENOMEM));
return unlock_scd (ctrl, 0);
}
/* Read a key with ID and return it in an allocate buffer pointed to
by r_BUF as a valid S-expression. */
int
agent_card_readkey (ctrl_t ctrl, const char *id, unsigned char **r_buf)
{
int rc;
char line[ASSUAN_LINELENGTH];
membuf_t data;
size_t len, buflen;
*r_buf = NULL;
rc = start_scd (ctrl);
if (rc)
return rc;
init_membuf (&data, 1024);
snprintf (line, DIM(line)-1, "READKEY %s", id);
line[DIM(line)-1] = 0;
rc = assuan_transact (ctrl->scd_local->ctx, line,
membuf_data_cb, &data,
NULL, NULL,
NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
return unlock_scd (ctrl, rc);
}
*r_buf = get_membuf (&data, &buflen);
if (!*r_buf)
return unlock_scd (ctrl, gpg_error (GPG_ERR_ENOMEM));
if (!gcry_sexp_canon_len (*r_buf, buflen, NULL, NULL))
{
xfree (*r_buf); *r_buf = NULL;
return unlock_scd (ctrl, gpg_error (GPG_ERR_INV_VALUE));
}
return unlock_scd (ctrl, 0);
}
/* Type used with the card_getattr_cb. */
struct card_getattr_parm_s {
const char *keyword; /* Keyword to look for. */
size_t keywordlen; /* strlen of KEYWORD. */
char *data; /* Malloced and unescaped data. */
int error; /* ERRNO value or 0 on success. */
};
/* Callback function for agent_card_getattr. */
static gpg_error_t
card_getattr_cb (void *opaque, const char *line)
{
struct card_getattr_parm_s *parm = opaque;
const char *keyword = line;
int keywordlen;
if (parm->data)
return 0; /* We want only the first occurrence. */
for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
;
while (spacep (line))
line++;
if (keywordlen == parm->keywordlen
&& !memcmp (keyword, parm->keyword, keywordlen))
{
parm->data = percent_plus_unescape ((const unsigned char*)line, 0xff);
if (!parm->data)
parm->error = errno;
}
return 0;
}
/* Call the agent to retrieve a single line data object. On success
the object is malloced and stored at RESULT; it is guaranteed that
NULL is never stored in this case. On error an error code is
returned and NULL stored at RESULT. */
gpg_error_t
agent_card_getattr (ctrl_t ctrl, const char *name, char **result)
{
int err;
struct card_getattr_parm_s parm;
char line[ASSUAN_LINELENGTH];
*result = NULL;
if (!*name)
return gpg_error (GPG_ERR_INV_VALUE);
memset (&parm, 0, sizeof parm);
parm.keyword = name;
parm.keywordlen = strlen (name);
/* We assume that NAME does not need escaping. */
if (8 + strlen (name) > DIM(line)-1)
return gpg_error (GPG_ERR_TOO_LARGE);
stpcpy (stpcpy (line, "GETATTR "), name);
err = start_scd (ctrl);
if (err)
return err;
err = assuan_transact (ctrl->scd_local->ctx, line,
NULL, NULL, NULL, NULL,
card_getattr_cb, &parm);
if (!err && parm.error)
err = gpg_error_from_errno (parm.error);
if (!err && !parm.data)
err = gpg_error (GPG_ERR_NO_DATA);
if (!err)
*result = parm.data;
else
xfree (parm.data);
return unlock_scd (ctrl, err);
}
static gpg_error_t
pass_status_thru (void *opaque, const char *line)
{
assuan_context_t ctx = opaque;
char keyword[200];
int i;
for (i=0; *line && !spacep (line) && i < DIM(keyword)-1; line++, i++)
keyword[i] = *line;
keyword[i] = 0;
/* truncate any remaining keyword stuff. */
for (; *line && !spacep (line); line++)
;
while (spacep (line))
line++;
assuan_write_status (ctx, keyword, line);
return 0;
}
static gpg_error_t
pass_data_thru (void *opaque, const void *buffer, size_t length)
{
assuan_context_t ctx = opaque;
assuan_send_data (ctx, buffer, length);
return 0;
}
/* Send the line CMDLINE with command for the SCDdaemon to it and send
all status messages back. This command is used as a general quoting
mechanism to pass everything verbatim to SCDAEMON. The PIN
inquiry is handled inside gpg-agent. */
int
agent_card_scd (ctrl_t ctrl, const char *cmdline,
int (*getpin_cb)(void *, const char *, char*, size_t),
void *getpin_cb_arg, void *assuan_context)
{
int rc;
struct inq_needpin_s inqparm;
rc = start_scd (ctrl);
if (rc)
return rc;
inqparm.ctx = ctrl->scd_local->ctx;
inqparm.getpin_cb = getpin_cb;
inqparm.getpin_cb_arg = getpin_cb_arg;
inqparm.passthru = assuan_context;
rc = assuan_transact (ctrl->scd_local->ctx, cmdline,
pass_data_thru, assuan_context,
inq_needpin, &inqparm,
pass_status_thru, assuan_context);
if (rc)
{
return unlock_scd (ctrl, rc);
}
return unlock_scd (ctrl, 0);
}