engine-g13.c
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engine-g13.c
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	/* engine-g13.c - G13 engine.
	* Copyright (C) 2000 Werner Koch (dd9jn)
	* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
	*
	* This file is part of GPGME.
	*
	* GPGME is free software; you can redistribute it and/or modify it
	* under the terms of the GNU Lesser General Public License as
	* published by the Free Software Foundation; either version 2.1 of
	* the License, or (at your option) any later version.
	*
	* GPGME 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this program; if not, see <https://gnu.org/licenses/>.
	* SPDX-License-Identifier: LGPL-2.1-or-later
	*/

	#if HAVE_CONFIG_H
	#include <config.h>
	#endif

	#include <stdlib.h>
	#include <string.h>
	#ifdef HAVE_SYS_TYPES_H
	# include <sys/types.h>
	#endif
	#include <assert.h>
	#ifdef HAVE_UNISTD_H
	# include <unistd.h>
	#endif
	#ifdef HAVE_LOCALE_H
	#include <locale.h>
	#endif
	#include <fcntl.h> /* FIXME */
	#include <errno.h>

	#include "gpgme.h"
	#include "util.h"
	#include "ops.h"
	#include "wait.h"
	#include "priv-io.h"
	#include "sema.h"

	#include "assuan.h"
	#include "debug.h"

	#include "engine-backend.h"


	typedef struct
	{
	int fd; /* FD we talk about. */
	int server_fd;/* Server FD for this connection. */
	int dir; /* Inbound/Outbound, maybe given implicit? */
	void data; / Handler-specific data. */
	void tag; / ID from the user for gpgme_remove_io_callback. */
	char server_fd_str[15]; /* Same as SERVER_FD but as a string. We
	need this because _gpgme_io_fd2str can't
	be used on a closed descriptor. */
	} iocb_data_t;


	struct engine_g13
	{
	assuan_context_t assuan_ctx;

	int lc_ctype_set;
	int lc_messages_set;

	iocb_data_t status_cb;

	struct gpgme_io_cbs io_cbs;

	/* User provided callbacks. */
	struct {
	gpgme_assuan_data_cb_t data_cb;
	void *data_cb_value;

	gpgme_assuan_inquire_cb_t inq_cb;
	void *inq_cb_value;

	gpgme_assuan_status_cb_t status_cb;
	void *status_cb_value;
	} user;
	};

	typedef struct engine_g13 *engine_g13_t;


	static void g13_io_event (void *engine,
	gpgme_event_io_t type, void *type_data);



	static char *
	g13_get_version (const char *file_name)
	{
	return _gpgme_get_program_version (file_name ? file_name
	: _gpgme_get_default_g13_name ());
	}


	static const char *
	g13_get_req_version (void)
	{
	return "2.1.0";
	}


	static void
	close_notify_handler (int fd, void *opaque)
	{
	engine_g13_t g13 = opaque;

	assert (fd != -1);
	if (g13->status_cb.fd == fd)
	{
	if (g13->status_cb.tag)
	(*g13->io_cbs.remove) (g13->status_cb.tag);
	g13->status_cb.fd = -1;
	g13->status_cb.tag = NULL;
	}
	}


	/* This is the default inquiry callback. We use it to handle the
	Pinentry notifications. */
	static gpgme_error_t
	default_inq_cb (engine_g13_t g13, const char keyword, const char args)
	{
	gpg_error_t err;

	if (!strcmp (keyword, "PINENTRY_LAUNCHED"))
	{
	_gpgme_allow_set_foreground_window ((pid_t)strtoul (args, NULL, 10));
	}

	if (g13->user.inq_cb)
	{
	gpgme_data_t data = NULL;

	err = g13->user.inq_cb (g13->user.inq_cb_value,
	keyword, args, &data);
	if (!err && data)
	{
	/* FIXME: Returning data is not yet implemented. However we
	need to allow the caller to cleanup his data object.
	Thus we run the callback in finish mode immediately. */
	err = g13->user.inq_cb (g13->user.inq_cb_value,
	NULL, NULL, &data);
	}
	}
	else
	err = 0;

	return err;
	}


	static gpgme_error_t
	g13_cancel (void *engine)
	{
	engine_g13_t g13 = engine;

	if (!g13)
	return gpg_error (GPG_ERR_INV_VALUE);

	if (g13->status_cb.fd != -1)
	_gpgme_io_close (g13->status_cb.fd);

	if (g13->assuan_ctx)
	{
	assuan_release (g13->assuan_ctx);
	g13->assuan_ctx = NULL;
	}

	return 0;
	}


	static gpgme_error_t
	g13_cancel_op (void *engine)
	{
	engine_g13_t g13 = engine;

	if (!g13)
	return gpg_error (GPG_ERR_INV_VALUE);

	if (g13->status_cb.fd != -1)
	_gpgme_io_close (g13->status_cb.fd);

	return 0;
	}


	static void
	g13_release (void *engine)
	{
	engine_g13_t g13 = engine;

	if (!g13)
	return;

	g13_cancel (engine);

	free (g13);
	}


	static gpgme_error_t
	g13_new (void *engine, const char file_name, const char *home_dir,
	const char *version)
	{
	gpgme_error_t err = 0;
	engine_g13_t g13;
	const char *pgmname;
	int argc;
	const char *argv[5];
	char *dft_display = NULL;
	char dft_ttyname[64];
	char *env_tty = NULL;
	char *dft_ttytype = NULL;
	char *optstr;

	(void)version; /* Not yet used. */

	g13 = calloc (1, sizeof *g13);
	if (!g13)
	return gpg_error_from_syserror ();

	g13->status_cb.fd = -1;
	g13->status_cb.dir = 1;
	g13->status_cb.tag = 0;
	g13->status_cb.data = g13;

	pgmname = file_name ? file_name : _gpgme_get_default_g13_name ();
	argc = 0;
	argv[argc++] = _gpgme_get_basename (pgmname);
	if (home_dir)
	{
	argv[argc++] = "--homedir";
	argv[argc++] = home_dir;
	}
	argv[argc++] = "--server";
	argv[argc++] = NULL;

	err = assuan_new_ext (&g13->assuan_ctx, GPG_ERR_SOURCE_GPGME,
	&_gpgme_assuan_malloc_hooks, _gpgme_assuan_log_cb,
	NULL);
	if (err)
	goto leave;
	assuan_ctx_set_system_hooks (g13->assuan_ctx, &_gpgme_assuan_system_hooks);

	#if USE_DESCRIPTOR_PASSING
	err = assuan_pipe_connect (g13->assuan_ctx, pgmname, argv,
	NULL, NULL, NULL, ASSUAN_PIPE_CONNECT_FDPASSING);
	#else
	err = assuan_pipe_connect (g13->assuan_ctx, pgmname, argv,
	NULL, NULL, NULL, 0);
	#endif
	if (err)
	goto leave;

	err = _gpgme_getenv ("DISPLAY", &dft_display);
	if (err)
	goto leave;
	if (dft_display)
	{
	if (gpgrt_asprintf (&optstr, "OPTION display=%s", dft_display) < 0)
	{
	free (dft_display);
	err = gpg_error_from_syserror ();
	goto leave;
	}
	free (dft_display);

	err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL, NULL,
	NULL, NULL, NULL);
	gpgrt_free (optstr);
	if (err)
	goto leave;
	}

	err = _gpgme_getenv ("GPG_TTY", &env_tty);
	if (isatty (1) \|\| env_tty \|\| err)
	{
	int rc = 0;

	if (err)
	goto leave;
	else if (env_tty)
	{
	snprintf (dft_ttyname, sizeof (dft_ttyname), "%s", env_tty);
	free (env_tty);
	}
	else
	rc = ttyname_r (1, dft_ttyname, sizeof (dft_ttyname));

	/* Even though isatty() returns 1, ttyname_r() may fail in many
	ways, e.g., when /dev/pts is not accessible under chroot. */
	if (!rc)
	{
	if (gpgrt_asprintf (&optstr, "OPTION ttyname=%s", dft_ttyname) < 0)
	{
	err = gpg_error_from_syserror ();
	goto leave;
	}
	err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL, NULL,
	NULL, NULL, NULL);
	gpgrt_free (optstr);
	if (err)
	goto leave;

	err = _gpgme_getenv ("TERM", &dft_ttytype);
	if (err)
	goto leave;
	if (dft_ttytype)
	{
	if (gpgrt_asprintf (&optstr, "OPTION ttytype=%s", dft_ttytype)< 0)
	{
	free (dft_ttytype);
	err = gpg_error_from_syserror ();
	goto leave;
	}
	free (dft_ttytype);

	err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL,
	NULL, NULL, NULL, NULL);
	gpgrt_free (optstr);
	if (err)
	goto leave;
	}
	}
	}

	#ifdef HAVE_W32_SYSTEM
	/* Under Windows we need to use AllowSetForegroundWindow. Tell
	g13 to tell us when it needs it. */
	if (!err)
	{
	err = assuan_transact (g13->assuan_ctx, "OPTION allow-pinentry-notify",
	NULL, NULL, NULL, NULL, NULL, NULL);
	if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
	err = 0; /* This is a new feature of g13. */
	}
	#endif /HAVE_W32_SYSTEM/

	leave:

	if (err)
	g13_release (g13);
	else
	*engine = g13;

	return err;
	}


	static gpgme_error_t
	g13_set_locale (void engine, int category, const char value)
	{
	engine_g13_t g13 = engine;
	gpgme_error_t err;
	char *optstr;
	const char *catstr;

	/* FIXME: If value is NULL, we need to reset the option to default.
	But we can't do this. So we error out here. G13 needs support
	for this. */
	if (0)
	;
	#ifdef LC_CTYPE
	else if (category == LC_CTYPE)
	{
	catstr = "lc-ctype";
	if (!value && g13->lc_ctype_set)
	return gpg_error (GPG_ERR_INV_VALUE);
	if (value)
	g13->lc_ctype_set = 1;
	}
	#endif
	#ifdef LC_MESSAGES
	else if (category == LC_MESSAGES)
	{
	catstr = "lc-messages";
	if (!value && g13->lc_messages_set)
	return gpg_error (GPG_ERR_INV_VALUE);
	if (value)
	g13->lc_messages_set = 1;
	}
	#endif /* LC_MESSAGES */
	else
	return gpg_error (GPG_ERR_INV_VALUE);

	/* FIXME: Reset value to default. */
	if (!value)
	return 0;

	if (gpgrt_asprintf (&optstr, "OPTION %s=%s", catstr, value) < 0)
	err = gpg_error_from_syserror ();
	else
	{
	err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL,
	NULL, NULL, NULL, NULL);
	gpgrt_free (optstr);
	}

	return err;
	}


	#if USE_DESCRIPTOR_PASSING
	static gpgme_error_t
	g13_assuan_simple_command (assuan_context_t ctx, const char *cmd,
	engine_status_handler_t status_fnc,
	void *status_fnc_value)
	{
	gpg_error_t err;
	char *line;
	size_t linelen;

	(void)status_fnc;
	(void)status_fnc_value;

	err = assuan_write_line (ctx, cmd);
	if (err)
	return err;

	do
	{
	err = assuan_read_line (ctx, &line, &linelen);
	if (err)
	return err;

	if (*line == '#' \|\| !linelen)
	continue;

	if (linelen >= 2
	&& line[0] == 'O' && line[1] == 'K'
	&& (line[2] == '\0' \|\| line[2] == ' '))
	return 0;
	else if (linelen >= 4
	&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
	&& line[3] == ' ')
	err = atoi (&line[4]);
	else if (linelen >= 2
	&& line[0] == 'S' && line[1] == ' ')
	{
	char *rest;

	rest = strchr (line + 2, ' ');
	if (!rest)
	rest = line + linelen; /* set to an empty string */
	else
	*(rest++) = 0;

	/* Nothing to do with status lines. */
	}
	else
	err = gpg_error (GPG_ERR_GENERAL);
	}
	while (!err);

	return err;
	}
	#endif


	static gpgme_error_t
	status_handler (void *opaque, int fd)
	{
	struct io_cb_data data = (struct io_cb_data ) opaque;
	engine_g13_t g13 = (engine_g13_t) data->handler_value;
	gpgme_error_t err = 0;
	char *line;
	size_t linelen;

	do
	{
	err = assuan_read_line (g13->assuan_ctx, &line, &linelen);
	if (err)
	{
	/* Try our best to terminate the connection friendly. */
	/* assuan_write_line (g13->assuan_ctx, "BYE"); */
	TRACE (DEBUG_CTX, "gpgme:status_handler", g13,
	"fd 0x%x: error reading assuan line: %s",
	fd, gpg_strerror (err));
	}
	else if (linelen >= 3
	&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
	&& (line[3] == '\0' \|\| line[3] == ' '))
	{
	if (line[3] == ' ')
	err = atoi (&line[4]);
	if (! err)
	err = gpg_error (GPG_ERR_GENERAL);
	TRACE (DEBUG_CTX, "gpgme:status_handler", g13,
	"fd 0x%x: ERR line: %s",
	fd, err ? gpg_strerror (err) : "ok");

	/* Command execution errors are not fatal, as we use
	a session based protocol. */
	data->op_err = err;

	/* The caller will do the rest (namely, call cancel_op,
	which closes status_fd). */
	return 0;
	}
	else if (linelen >= 2
	&& line[0] == 'O' && line[1] == 'K'
	&& (line[2] == '\0' \|\| line[2] == ' '))
	{
	TRACE (DEBUG_CTX, "gpgme:status_handler", g13,
	"fd 0x%x: OK line", fd);

	_gpgme_io_close (g13->status_cb.fd);
	return 0;
	}
	else if (linelen > 2
	&& line[0] == 'D' && line[1] == ' ')
	{
	/* We are using the colon handler even for plain inline data
	- strange name for that function but for historic reasons
	we keep it. */
	/* FIXME We can't use this for binary data because we
	assume this is a string. For the current usage of colon
	output it is correct. */
	char *src = line + 2;
	char *end = line + linelen;
	char *dst = src;

	linelen = 0;
	while (src < end)
	{
	if (*src == '%' && src + 2 < end)
	{
	/* Handle escaped characters. */
	++src;
	*dst++ = _gpgme_hextobyte (src);
	src += 2;
	}
	else
	dst++ = src++;

	linelen++;
	}

	src = line + 2;
	if (linelen && g13->user.data_cb)
	err = g13->user.data_cb (g13->user.data_cb_value,
	src, linelen);
	else
	err = 0;

	TRACE (DEBUG_CTX, "gpgme:g13_status_handler", g13,
	"fd 0x%x: D inlinedata; status from cb: %s",
	fd, (g13->user.data_cb ?
	(err? gpg_strerror (err):"ok"):"no callback"));

	}
	else if (linelen > 2
	&& line[0] == 'S' && line[1] == ' ')
	{
	char *src;
	char *args;

	src = line + 2;
	while (*src == ' ')
	src++;

	args = strchr (line + 2, ' ');
	if (!args)
	args = line + linelen; /* set to an empty string */
	else
	*(args++) = 0;

	while (*args == ' ')
	args++;

	if (g13->user.status_cb)
	err = g13->user.status_cb (g13->user.status_cb_value,
	src, args);
	else
	err = 0;

	TRACE (DEBUG_CTX, "gpgme:g13_status_handler", g13,
	"fd 0x%x: S line (%s) - status from cb: %s",
	fd, line+2, (g13->user.status_cb ?
	(err? gpg_strerror (err):"ok"):"no callback"));
	}
	else if (linelen >= 7
	&& line[0] == 'I' && line[1] == 'N' && line[2] == 'Q'
	&& line[3] == 'U' && line[4] == 'I' && line[5] == 'R'
	&& line[6] == 'E'
	&& (line[7] == '\0' \|\| line[7] == ' '))
	{
	char *src;
	char *args;

	for (src=line+7; *src == ' '; src++)
	;

	args = strchr (src, ' ');
	if (!args)
	args = line + linelen; /* Let it point to an empty string. */
	else
	*(args++) = 0;

	while (*args == ' ')
	args++;

	err = default_inq_cb (g13, src, args);
	if (!err)
	{
	/* Flush and send END. */
	err = assuan_send_data (g13->assuan_ctx, NULL, 0);
	}
	else if (gpg_err_code (err) == GPG_ERR_ASS_CANCELED)
	{
	/* Flush and send CANcel. */
	err = assuan_send_data (g13->assuan_ctx, NULL, 1);
	}
	assuan_write_line (g13->assuan_ctx, "END");
	}
	}
	while (!err && assuan_pending_line (g13->assuan_ctx));

	return err;
	}


	static gpgme_error_t
	add_io_cb (engine_g13_t g13, iocb_data_t *iocbd, gpgme_io_cb_t handler)
	{
	gpgme_error_t err;

	TRACE_BEG (DEBUG_ENGINE, "engine-g13:add_io_cb", g13,
	"fd=%d, dir %d", iocbd->fd, iocbd->dir);
	err = (*g13->io_cbs.add) (g13->io_cbs.add_priv,
	iocbd->fd, iocbd->dir,
	handler, iocbd->data, &iocbd->tag);
	if (err)
	return TRACE_ERR (err);
	if (!iocbd->dir)
	/* FIXME Kludge around poll() problem. */
	err = _gpgme_io_set_nonblocking (iocbd->fd);
	return TRACE_ERR (err);
	}


	static gpgme_error_t
	start (engine_g13_t g13, const char *command)
	{
	gpgme_error_t err;
	assuan_fd_t afdlist[5];
	int fdlist[5];
	int nfds;
	int i;

	/* We need to know the fd used by assuan for reads. We do this by
	using the assumption that the first returned fd from
	assuan_get_active_fds() is always this one. */
	nfds = assuan_get_active_fds (g13->assuan_ctx, 0 /* read fds */,
	afdlist, DIM (afdlist));
	if (nfds < 1)
	return gpg_error (GPG_ERR_GENERAL); /* FIXME */
	/* For now... */
	for (i = 0; i < nfds; i++)
	fdlist[i] = (int) afdlist[i];

	/* We "duplicate" the file descriptor, so we can close it here (we
	can't close fdlist[0], as that is closed by libassuan, and
	closing it here might cause libassuan to close some unrelated FD
	later). Alternatively, we could special case status_fd and
	register/unregister it manually as needed, but this increases
	code duplication and is more complicated as we can not use the
	close notifications etc. A third alternative would be to let
	Assuan know that we closed the FD, but that complicates the
	Assuan interface. */

	g13->status_cb.fd = _gpgme_io_dup (fdlist[0]);
	if (g13->status_cb.fd < 0)
	return gpg_error_from_syserror ();

	if (_gpgme_io_set_close_notify (g13->status_cb.fd,
	close_notify_handler, g13))
	{
	_gpgme_io_close (g13->status_cb.fd);
	g13->status_cb.fd = -1;
	return gpg_error (GPG_ERR_GENERAL);
	}

	err = add_io_cb (g13, &g13->status_cb, status_handler);
	if (!err)
	err = assuan_write_line (g13->assuan_ctx, command);

	if (!err)
	g13_io_event (g13, GPGME_EVENT_START, NULL);

	return err;
	}


	#if USE_DESCRIPTOR_PASSING
	static gpgme_error_t
	g13_reset (void *engine)
	{
	engine_g13_t g13 = engine;

	/* We must send a reset because we need to reset the list of
	signers. Note that RESET does not reset OPTION commands. */
	return g13_assuan_simple_command (g13->assuan_ctx, "RESET", NULL, NULL);
	}
	#endif


	static gpgme_error_t
	g13_transact (void *engine,
	const char *command,
	gpgme_assuan_data_cb_t data_cb,
	void *data_cb_value,
	gpgme_assuan_inquire_cb_t inq_cb,
	void *inq_cb_value,
	gpgme_assuan_status_cb_t status_cb,
	void *status_cb_value)
	{
	engine_g13_t g13 = engine;
	gpgme_error_t err;

	if (!g13 \|\| !command \|\| !*command)
	return gpg_error (GPG_ERR_INV_VALUE);

	g13->user.data_cb = data_cb;
	g13->user.data_cb_value = data_cb_value;
	g13->user.inq_cb = inq_cb;
	g13->user.inq_cb_value = inq_cb_value;
	g13->user.status_cb = status_cb;
	g13->user.status_cb_value = status_cb_value;

	err = start (g13, command);
	return err;
	}



	static void
	g13_set_io_cbs (void *engine, gpgme_io_cbs_t io_cbs)
	{
	engine_g13_t g13 = engine;
	g13->io_cbs = *io_cbs;
	}


	static void
	g13_io_event (void engine, gpgme_event_io_t type, void type_data)
	{
	engine_g13_t g13 = engine;

	TRACE (DEBUG_ENGINE, "gpgme:g13_io_event", g13,
	"event %p, type %d, type_data %p",
	g13->io_cbs.event, type, type_data);
	if (g13->io_cbs.event)
	(*g13->io_cbs.event) (g13->io_cbs.event_priv, type, type_data);
	}


	struct engine_ops _gpgme_engine_ops_g13 =
	{
	/* Static functions. */
	_gpgme_get_default_g13_name,
	NULL,
	g13_get_version,
	g13_get_req_version,
	g13_new,

	/* Member functions. */
	g13_release,
	#if USE_DESCRIPTOR_PASSING
	g13_reset,
	#else
	NULL, /* reset */
	#endif
	NULL, /* set_status_cb */
	NULL, /* set_status_handler */
	NULL, /* set_command_handler */
	NULL, /* set_colon_line_handler */
	g13_set_locale,
	NULL, /* set_protocol */
	NULL, /* set_engine_flags */
	NULL, /* decrypt */
	NULL, /* delete */
	NULL, /* edit */
	NULL, /* encrypt */
	NULL, /* encrypt_sign */
	NULL, /* export */
	NULL, /* export_ext */
	NULL, /* genkey */
	NULL, /* import */
	NULL, /* keylist */
	NULL, /* keylist_ext */
	NULL, /* keylist_data */
	NULL, /* keysign */
	NULL, /* revsig */
	NULL, /* tofu_policy */
	NULL, /* sign */
	NULL, /* verify */
	NULL, /* getauditlog */
	NULL, /* setexpire */
	g13_transact,
	NULL, /* conf_load */
	NULL, /* conf_save */
	NULL, /* conf_dir */
	NULL, /* query_swdb */
	g13_set_io_cbs,
	g13_io_event,
	g13_cancel,
	g13_cancel_op,
	NULL, /* passwd */
	NULL, /* set_pinentry_mode */
	NULL /* opspawn */
	};

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