mirror of git://git.gnupg.org/gnupg.git
714 lines
17 KiB
C
714 lines
17 KiB
C
/* call-agent.c - divert operations to the agent
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* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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#include <assert.h>
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#include "gpgsm.h"
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#include <gcrypt.h>
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#include <assuan.h>
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#include "i18n.h"
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#include "keydb.h" /* fixme: Move this to import.c */
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#include "../common/membuf.h"
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static ASSUAN_CONTEXT agent_ctx = NULL;
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static int force_pipe_server = 0;
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struct cipher_parm_s {
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ASSUAN_CONTEXT ctx;
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const char *ciphertext;
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size_t ciphertextlen;
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};
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struct genkey_parm_s {
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ASSUAN_CONTEXT ctx;
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const char *sexp;
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size_t sexplen;
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};
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struct learn_parm_s {
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int error;
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ASSUAN_CONTEXT ctx;
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membuf_t *data;
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};
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/* Try to connect to the agent via socket or fork it off and work by
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pipes. Handle the server's initial greeting */
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static int
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start_agent (void)
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{
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int rc = 0;
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char *infostr, *p;
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ASSUAN_CONTEXT ctx;
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char *dft_display = NULL;
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char *dft_ttyname = NULL;
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char *dft_ttytype = NULL;
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char *old_lc = NULL;
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char *dft_lc = NULL;
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if (agent_ctx)
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return 0; /* fixme: We need a context for each thread or serialize
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the access to the agent (which is suitable given that
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the agent is not MT */
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infostr = force_pipe_server? NULL : getenv ("GPG_AGENT_INFO");
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if (!infostr)
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{
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const char *pgmname;
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const char *argv[3];
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int no_close_list[3];
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int i;
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if (opt.verbose)
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log_info (_("no running gpg-agent - starting one\n"));
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if (fflush (NULL))
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{
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gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
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log_error ("error flushing pending output: %s\n", strerror (errno));
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return tmperr;
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}
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if (!opt.agent_program || !*opt.agent_program)
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opt.agent_program = GNUPG_DEFAULT_AGENT;
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if ( !(pgmname = strrchr (opt.agent_program, '/')))
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pgmname = opt.agent_program;
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else
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pgmname++;
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argv[0] = pgmname;
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argv[1] = "--server";
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argv[2] = NULL;
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i=0;
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if (log_get_fd () != -1)
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no_close_list[i++] = log_get_fd ();
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no_close_list[i++] = fileno (stderr);
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no_close_list[i] = -1;
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/* connect to the agent and perform initial handshaking */
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rc = assuan_pipe_connect (&ctx, opt.agent_program, (char**)argv,
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no_close_list);
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}
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else
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{
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int prot;
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int pid;
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infostr = xstrdup (infostr);
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if ( !(p = strchr (infostr, ':')) || p == infostr)
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{
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log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
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xfree (infostr);
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force_pipe_server = 1;
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return start_agent ();
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}
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*p++ = 0;
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pid = atoi (p);
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while (*p && *p != ':')
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p++;
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prot = *p? atoi (p+1) : 0;
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if (prot != 1)
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{
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log_error (_("gpg-agent protocol version %d is not supported\n"),
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prot);
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xfree (infostr);
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force_pipe_server = 1;
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return start_agent ();
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}
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rc = assuan_socket_connect (&ctx, infostr, pid);
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xfree (infostr);
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if (rc == ASSUAN_Connect_Failed)
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{
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log_error (_("can't connect to the agent - trying fall back\n"));
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force_pipe_server = 1;
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return start_agent ();
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}
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}
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if (rc)
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{
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log_error ("can't connect to the agent: %s\n", assuan_strerror (rc));
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return gpg_error (GPG_ERR_NO_AGENT);
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}
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agent_ctx = ctx;
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if (DBG_ASSUAN)
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log_debug ("connection to agent established\n");
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rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return map_assuan_err (rc);
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dft_display = getenv ("DISPLAY");
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if (opt.display || dft_display)
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION display=%s",
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opt.display ? opt.display : dft_display) < 0)
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return OUT_OF_CORE (errno);
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rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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free (optstr);
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if (rc)
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return map_assuan_err (rc);
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}
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if (!opt.ttyname)
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{
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dft_ttyname = getenv ("GPG_TTY");
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if ((!dft_ttyname || !*dft_ttyname) && ttyname (0))
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dft_ttyname = ttyname (0);
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}
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if (opt.ttyname || dft_ttyname)
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION ttyname=%s",
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opt.ttyname ? opt.ttyname : dft_ttyname) < 0)
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return OUT_OF_CORE (errno);
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rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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free (optstr);
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if (rc)
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return map_assuan_err (rc);
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}
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dft_ttytype = getenv ("TERM");
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if (opt.ttytype || (dft_ttyname && dft_ttytype))
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION ttytype=%s",
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opt.ttyname ? opt.ttytype : dft_ttytype) < 0)
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return OUT_OF_CORE (errno);
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rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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free (optstr);
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if (rc)
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return map_assuan_err (rc);
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}
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#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
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old_lc = setlocale (LC_CTYPE, NULL);
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if (old_lc)
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{
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old_lc = strdup (old_lc);
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if (!old_lc)
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return OUT_OF_CORE (errno);
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}
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dft_lc = setlocale (LC_CTYPE, "");
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#endif
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if (opt.lc_ctype || (dft_ttyname && dft_lc))
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION lc-ctype=%s",
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opt.lc_ctype ? opt.lc_ctype : dft_lc) < 0)
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rc = OUT_OF_CORE (errno);
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else
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{
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rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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free (optstr);
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if (rc)
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rc = map_assuan_err (rc);
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}
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}
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#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
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if (old_lc)
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{
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setlocale (LC_CTYPE, old_lc);
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free (old_lc);
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}
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#endif
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if (rc)
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return rc;
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#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
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old_lc = setlocale (LC_MESSAGES, NULL);
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if (old_lc)
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{
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old_lc = strdup (old_lc);
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if (!old_lc)
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return OUT_OF_CORE (errno);
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}
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dft_lc = setlocale (LC_MESSAGES, "");
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#endif
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if (opt.lc_messages || (dft_ttyname && dft_lc))
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION lc-messages=%s",
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opt.lc_messages ? opt.lc_messages : dft_lc) < 0)
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rc = OUT_OF_CORE (errno);
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else
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{
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rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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free (optstr);
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if (rc)
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rc = map_assuan_err (rc);
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}
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}
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#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
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if (old_lc)
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{
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setlocale (LC_MESSAGES, old_lc);
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free (old_lc);
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}
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#endif
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return rc;
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}
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static AssuanError
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membuf_data_cb (void *opaque, const void *buffer, size_t length)
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{
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membuf_t *data = opaque;
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if (buffer)
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put_membuf (data, buffer, length);
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return 0;
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}
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/* Call the agent to do a sign operation using the key identified by
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the hex string KEYGRIP. */
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int
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gpgsm_agent_pksign (const char *keygrip,
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unsigned char *digest, size_t digestlen, int digestalgo,
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char **r_buf, size_t *r_buflen )
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{
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int rc, i;
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char *p, line[ASSUAN_LINELENGTH];
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membuf_t data;
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size_t len;
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*r_buf = NULL;
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rc = start_agent ();
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if (rc)
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return rc;
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if (digestlen*2 + 50 > DIM(line))
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return gpg_error (GPG_ERR_GENERAL);
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rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return map_assuan_err (rc);
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snprintf (line, DIM(line)-1, "SIGKEY %s", keygrip);
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line[DIM(line)-1] = 0;
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rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return map_assuan_err (rc);
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sprintf (line, "SETHASH %d ", digestalgo);
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p = line + strlen (line);
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for (i=0; i < digestlen ; i++, p += 2 )
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sprintf (p, "%02X", digest[i]);
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rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return map_assuan_err (rc);
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init_membuf (&data, 1024);
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rc = assuan_transact (agent_ctx, "PKSIGN",
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membuf_data_cb, &data, NULL, NULL, NULL, NULL);
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if (rc)
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{
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xfree (get_membuf (&data, &len));
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return map_assuan_err (rc);
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}
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*r_buf = get_membuf (&data, r_buflen);
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if (!gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL))
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{
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xfree (*r_buf); *r_buf = NULL;
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return gpg_error (GPG_ERR_INV_VALUE);
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}
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return *r_buf? 0 : OUT_OF_CORE (errno);
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}
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/* Handle a CIPHERTEXT inquiry. Note, we only send the data,
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assuan_transact talkes care of flushing and writing the end */
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static AssuanError
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inq_ciphertext_cb (void *opaque, const char *keyword)
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{
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struct cipher_parm_s *parm = opaque;
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AssuanError rc;
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assuan_begin_confidential (parm->ctx);
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rc = assuan_send_data (parm->ctx, parm->ciphertext, parm->ciphertextlen);
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assuan_end_confidential (parm->ctx);
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return rc;
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}
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/* Call the agent to do a decrypt operation using the key identified by
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the hex string KEYGRIP. */
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int
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gpgsm_agent_pkdecrypt (const char *keygrip,
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KsbaConstSexp ciphertext,
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char **r_buf, size_t *r_buflen )
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{
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int rc;
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char line[ASSUAN_LINELENGTH];
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membuf_t data;
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struct cipher_parm_s cipher_parm;
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size_t n, len;
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char *buf, *endp;
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size_t ciphertextlen;
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if (!keygrip || strlen(keygrip) != 40 || !ciphertext || !r_buf || !r_buflen)
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return gpg_error (GPG_ERR_INV_VALUE);
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*r_buf = NULL;
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ciphertextlen = gcry_sexp_canon_len (ciphertext, 0, NULL, NULL);
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if (!ciphertextlen)
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return gpg_error (GPG_ERR_INV_VALUE);
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rc = start_agent ();
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if (rc)
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return rc;
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rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return map_assuan_err (rc);
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assert ( DIM(line) >= 50 );
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snprintf (line, DIM(line)-1, "SETKEY %s", keygrip);
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line[DIM(line)-1] = 0;
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rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return map_assuan_err (rc);
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init_membuf (&data, 1024);
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cipher_parm.ctx = agent_ctx;
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cipher_parm.ciphertext = ciphertext;
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cipher_parm.ciphertextlen = ciphertextlen;
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rc = assuan_transact (agent_ctx, "PKDECRYPT",
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membuf_data_cb, &data,
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inq_ciphertext_cb, &cipher_parm, NULL, NULL);
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if (rc)
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{
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xfree (get_membuf (&data, &len));
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return map_assuan_err (rc);
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}
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put_membuf (&data, "", 1); /* make sure it is 0 terminated */
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buf = get_membuf (&data, &len);
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if (!buf)
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return gpg_error (GPG_ERR_ENOMEM);
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/* FIXME: We would better a return a full S-exp and not just a part */
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assert (len);
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len--; /* remove the terminating 0 */
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n = strtoul (buf, &endp, 10);
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if (!n || *endp != ':')
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return gpg_error (GPG_ERR_INV_SEXP);
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endp++;
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if (endp-buf+n > len)
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return gpg_error (GPG_ERR_INV_SEXP); /* oops len does not
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match internal len*/
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memmove (buf, endp, n);
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*r_buflen = n;
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*r_buf = buf;
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return 0;
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}
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/* Handle a KEYPARMS inquiry. Note, we only send the data,
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assuan_transact takes care of flushing and writing the end */
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static AssuanError
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inq_genkey_parms (void *opaque, const char *keyword)
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{
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struct genkey_parm_s *parm = opaque;
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AssuanError rc;
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rc = assuan_send_data (parm->ctx, parm->sexp, parm->sexplen);
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return rc;
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}
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/* Call the agent to generate a newkey */
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int
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gpgsm_agent_genkey (KsbaConstSexp keyparms, KsbaSexp *r_pubkey)
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{
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int rc;
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struct genkey_parm_s gk_parm;
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membuf_t data;
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size_t len;
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char *buf;
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*r_pubkey = NULL;
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rc = start_agent ();
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if (rc)
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return rc;
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rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return map_assuan_err (rc);
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init_membuf (&data, 1024);
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gk_parm.ctx = agent_ctx;
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gk_parm.sexp = keyparms;
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gk_parm.sexplen = gcry_sexp_canon_len (keyparms, 0, NULL, NULL);
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if (!gk_parm.sexplen)
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return gpg_error (GPG_ERR_INV_VALUE);
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rc = assuan_transact (agent_ctx, "GENKEY",
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membuf_data_cb, &data,
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inq_genkey_parms, &gk_parm, NULL, NULL);
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if (rc)
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{
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xfree (get_membuf (&data, &len));
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return map_assuan_err (rc);
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}
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buf = get_membuf (&data, &len);
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if (!buf)
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return gpg_error (GPG_ERR_ENOMEM);
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if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
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{
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xfree (buf);
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return gpg_error (GPG_ERR_INV_SEXP);
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}
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*r_pubkey = buf;
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return 0;
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}
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/* Ask the agent whether the certificate is in the list of trusted
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keys */
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int
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gpgsm_agent_istrusted (KsbaCert cert)
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{
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int rc;
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char *fpr;
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char line[ASSUAN_LINELENGTH];
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|
||
rc = start_agent ();
|
||
if (rc)
|
||
return rc;
|
||
|
||
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)-1, "ISTRUSTED %s", fpr);
|
||
line[DIM(line)-1] = 0;
|
||
xfree (fpr);
|
||
|
||
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
|
||
return map_assuan_err (rc);
|
||
}
|
||
|
||
/* Ask the agent to mark CERT as a trusted Root-CA one */
|
||
int
|
||
gpgsm_agent_marktrusted (KsbaCert cert)
|
||
{
|
||
int rc;
|
||
char *fpr, *dn;
|
||
char line[ASSUAN_LINELENGTH];
|
||
|
||
rc = start_agent ();
|
||
if (rc)
|
||
return rc;
|
||
|
||
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);
|
||
}
|
||
snprintf (line, DIM(line)-1, "MARKTRUSTED %s S %s", fpr, dn);
|
||
line[DIM(line)-1] = 0;
|
||
ksba_free (dn);
|
||
xfree (fpr);
|
||
|
||
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
|
||
return map_assuan_err (rc);
|
||
}
|
||
|
||
|
||
|
||
/* Ask the agent whether the a corresponding secret key is available
|
||
for the given keygrip */
|
||
int
|
||
gpgsm_agent_havekey (const char *hexkeygrip)
|
||
{
|
||
int rc;
|
||
char line[ASSUAN_LINELENGTH];
|
||
|
||
rc = start_agent ();
|
||
if (rc)
|
||
return rc;
|
||
|
||
if (!hexkeygrip || strlen (hexkeygrip) != 40)
|
||
return gpg_error (GPG_ERR_INV_VALUE);
|
||
|
||
snprintf (line, DIM(line)-1, "HAVEKEY %s", hexkeygrip);
|
||
line[DIM(line)-1] = 0;
|
||
|
||
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
|
||
return map_assuan_err (rc);
|
||
}
|
||
|
||
|
||
static AssuanError
|
||
learn_cb (void *opaque, const void *buffer, size_t length)
|
||
{
|
||
struct learn_parm_s *parm = opaque;
|
||
size_t len;
|
||
char *buf;
|
||
KsbaCert 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;
|
||
}
|
||
|
||
|
||
/* FIXME: this should go into import.c */
|
||
cert = ksba_cert_new ();
|
||
if (!cert)
|
||
{
|
||
parm->error = gpg_error (GPG_ERR_ENOMEM);
|
||
return 0;
|
||
}
|
||
rc = ksba_cert_init_from_mem (cert, buf, len);
|
||
if (rc)
|
||
{
|
||
log_error ("failed to parse a certificate: %s\n", ksba_strerror (rc));
|
||
ksba_cert_release (cert);
|
||
parm->error = map_ksba_err (rc);
|
||
return 0;
|
||
}
|
||
|
||
rc = gpgsm_basic_cert_check (cert);
|
||
if (gpg_err_code (rc) == GPG_ERR_MISSING_CERT)
|
||
{ /* For later use we store it in the ephemeral database. */
|
||
log_info ("issuer certificate missing - storing as ephemeral\n");
|
||
keydb_store_cert (cert, 1, NULL);
|
||
}
|
||
else if (rc)
|
||
log_error ("invalid certificate: %s\n", gpg_strerror (rc));
|
||
else
|
||
{
|
||
int existed;
|
||
|
||
if (!keydb_store_cert (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 ()
|
||
{
|
||
int rc;
|
||
struct learn_parm_s learn_parm;
|
||
membuf_t data;
|
||
size_t len;
|
||
|
||
rc = start_agent ();
|
||
if (rc)
|
||
return rc;
|
||
|
||
init_membuf (&data, 4096);
|
||
learn_parm.error = 0;
|
||
learn_parm.ctx = agent_ctx;
|
||
learn_parm.data = &data;
|
||
rc = assuan_transact (agent_ctx, "LEARN --send",
|
||
learn_cb, &learn_parm,
|
||
NULL, NULL, NULL, NULL);
|
||
xfree (get_membuf (&data, &len));
|
||
if (rc)
|
||
return map_assuan_err (rc);
|
||
return learn_parm.error;
|
||
}
|
||
|
||
|
||
/* Ask the agent to change the passphrase of the key identified by HEXKEYGRIP. */
|
||
int
|
||
gpgsm_agent_passwd (const char *hexkeygrip)
|
||
{
|
||
int rc;
|
||
char line[ASSUAN_LINELENGTH];
|
||
|
||
rc = start_agent ();
|
||
if (rc)
|
||
return rc;
|
||
|
||
if (!hexkeygrip || strlen (hexkeygrip) != 40)
|
||
return gpg_error (GPG_ERR_INV_VALUE);
|
||
|
||
snprintf (line, DIM(line)-1, "PASSWD %s", hexkeygrip);
|
||
line[DIM(line)-1] = 0;
|
||
|
||
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
|
||
return map_assuan_err (rc);
|
||
}
|
||
|