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56e1864aa3
* tools/gpg-wks-client.c (encrypt_response): Add arg FINGERPRINT. (send_confirmation_response): Ditto. (process_confirmation_request): Parse out fingerprint and pass send_confirmation_response. -- This is useful for debugging the protocol and to avoid surprises when the sender tries to open a message from the Sent folder. Signed-off-by: Werner Koch <wk@gnupg.org>
1045 lines
27 KiB
C
1045 lines
27 KiB
C
/* gpg-wks-client.c - A client for the Web Key Service protocols.
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* Copyright (C) 2016 Werner Koch
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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 3 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, see <https://www.gnu.org/licenses/>.
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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 "util.h"
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#include "i18n.h"
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#include "sysutils.h"
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#include "init.h"
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#include "asshelp.h"
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#include "userids.h"
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#include "ccparray.h"
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#include "exectool.h"
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#include "mbox-util.h"
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#include "name-value.h"
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#include "call-dirmngr.h"
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#include "mime-maker.h"
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#include "send-mail.h"
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#include "gpg-wks.h"
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/* Constants to identify the commands and options. */
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enum cmd_and_opt_values
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{
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aNull = 0,
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oQuiet = 'q',
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oVerbose = 'v',
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oOutput = 'o',
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oDebug = 500,
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aSupported,
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aCreate,
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aReceive,
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aRead,
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oGpgProgram,
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oSend,
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oFakeSubmissionAddr,
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oDummy
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};
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/* The list of commands and options. */
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static ARGPARSE_OPTS opts[] = {
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ARGPARSE_group (300, ("@Commands:\n ")),
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ARGPARSE_c (aSupported, "supported",
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("check whether provider supports WKS")),
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ARGPARSE_c (aCreate, "create",
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("create a publication request")),
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ARGPARSE_c (aReceive, "receive",
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("receive a MIME confirmation request")),
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ARGPARSE_c (aRead, "read",
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("receive a plain text confirmation request")),
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ARGPARSE_group (301, ("@\nOptions:\n ")),
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ARGPARSE_s_n (oVerbose, "verbose", ("verbose")),
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ARGPARSE_s_n (oQuiet, "quiet", ("be somewhat more quiet")),
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ARGPARSE_s_s (oDebug, "debug", "@"),
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ARGPARSE_s_s (oGpgProgram, "gpg", "@"),
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ARGPARSE_s_n (oSend, "send", "send the mail using sendmail"),
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ARGPARSE_s_s (oOutput, "output", "|FILE|write the mail to FILE"),
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ARGPARSE_s_s (oFakeSubmissionAddr, "fake-submission-addr", "@"),
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ARGPARSE_end ()
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};
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/* The list of supported debug flags. */
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static struct debug_flags_s debug_flags [] =
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{
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{ DBG_MIME_VALUE , "mime" },
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{ DBG_PARSER_VALUE , "parser" },
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{ DBG_CRYPTO_VALUE , "crypto" },
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{ DBG_MEMORY_VALUE , "memory" },
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{ DBG_MEMSTAT_VALUE, "memstat" },
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{ DBG_IPC_VALUE , "ipc" },
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{ DBG_EXTPROG_VALUE, "extprog" },
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{ 0, NULL }
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};
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/* Value of the option --fake-submission-addr. */
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const char *fake_submission_addr;
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static void wrong_args (const char *text) GPGRT_ATTR_NORETURN;
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static gpg_error_t command_supported (char *userid);
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static gpg_error_t command_send (const char *fingerprint, char *userid);
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static gpg_error_t encrypt_response (estream_t *r_output, estream_t input,
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const char *addrspec,
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const char *fingerprint);
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static gpg_error_t read_confirmation_request (estream_t msg);
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static gpg_error_t command_receive_cb (void *opaque,
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const char *mediatype, estream_t fp,
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unsigned int flags);
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/* Print usage information and and provide strings for help. */
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static const char *
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my_strusage( int level )
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{
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const char *p;
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switch (level)
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{
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case 11: p = "gpg-wks-client (@GNUPG@)";
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break;
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case 13: p = VERSION; break;
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case 17: p = PRINTABLE_OS_NAME; break;
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case 19: p = ("Please report bugs to <@EMAIL@>.\n"); break;
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case 1:
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case 40:
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p = ("Usage: gpg-wks-client [command] [options] [args] (-h for help)");
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break;
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case 41:
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p = ("Syntax: gpg-wks-client [command] [options] [args]\n"
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"Client for the Web Key Service\n");
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break;
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default: p = NULL; break;
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}
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return p;
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}
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static void
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wrong_args (const char *text)
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{
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es_fprintf (es_stderr, _("usage: %s [options] %s\n"), strusage (11), text);
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exit (2);
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}
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/* Command line parsing. */
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static enum cmd_and_opt_values
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parse_arguments (ARGPARSE_ARGS *pargs, ARGPARSE_OPTS *popts)
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{
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enum cmd_and_opt_values cmd = 0;
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int no_more_options = 0;
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while (!no_more_options && optfile_parse (NULL, NULL, NULL, pargs, popts))
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{
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switch (pargs->r_opt)
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{
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case oQuiet: opt.quiet = 1; break;
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case oVerbose: opt.verbose++; break;
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case oDebug:
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if (parse_debug_flag (pargs->r.ret_str, &opt.debug, debug_flags))
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{
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pargs->r_opt = ARGPARSE_INVALID_ARG;
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pargs->err = ARGPARSE_PRINT_ERROR;
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}
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break;
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case oGpgProgram:
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opt.gpg_program = pargs->r.ret_str;
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break;
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case oSend:
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opt.use_sendmail = 1;
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break;
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case oOutput:
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opt.output = pargs->r.ret_str;
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break;
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case oFakeSubmissionAddr:
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fake_submission_addr = pargs->r.ret_str;
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break;
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case aSupported:
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case aCreate:
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case aReceive:
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case aRead:
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cmd = pargs->r_opt;
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break;
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default: pargs->err = 2; break;
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}
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}
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return cmd;
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}
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/* gpg-wks-client main. */
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int
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main (int argc, char **argv)
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{
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gpg_error_t err;
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ARGPARSE_ARGS pargs;
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enum cmd_and_opt_values cmd;
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gnupg_reopen_std ("gpg-wks-client");
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set_strusage (my_strusage);
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log_set_prefix ("gpg-wks-client", GPGRT_LOG_WITH_PREFIX);
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/* Make sure that our subsystems are ready. */
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i18n_init();
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init_common_subsystems (&argc, &argv);
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assuan_set_gpg_err_source (GPG_ERR_SOURCE_DEFAULT);
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setup_libassuan_logging (&opt.debug, NULL);
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/* Parse the command line. */
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pargs.argc = &argc;
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pargs.argv = &argv;
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pargs.flags = ARGPARSE_FLAG_KEEP;
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cmd = parse_arguments (&pargs, opts);
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if (log_get_errorcount (0))
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exit (2);
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/* Print a warning if an argument looks like an option. */
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if (!opt.quiet && !(pargs.flags & ARGPARSE_FLAG_STOP_SEEN))
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{
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int i;
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for (i=0; i < argc; i++)
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if (argv[i][0] == '-' && argv[i][1] == '-')
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log_info (("NOTE: '%s' is not considered an option\n"), argv[i]);
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}
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/* Set defaults for non given options. */
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if (!opt.gpg_program)
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opt.gpg_program = gnupg_module_name (GNUPG_MODULE_NAME_GPG);
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/* Tell call-dirmngr what options we want. */
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set_dirmngr_options (opt.verbose, (opt.debug & DBG_IPC_VALUE), 1);
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/* Run the selected command. */
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switch (cmd)
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{
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case aSupported:
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if (argc != 1)
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wrong_args ("--supported USER-ID");
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err = command_supported (argv[0]);
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if (err && gpg_err_code (err) != GPG_ERR_FALSE)
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log_error ("checking support failed: %s\n", gpg_strerror (err));
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break;
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case aCreate:
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if (argc != 2)
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wrong_args ("--create FINGERPRINT USER-ID");
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err = command_send (argv[0], argv[1]);
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if (err)
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log_error ("creating request failed: %s\n", gpg_strerror (err));
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break;
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case aReceive:
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if (argc)
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wrong_args ("--receive < MIME-DATA");
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err = wks_receive (es_stdin, command_receive_cb, NULL);
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if (err)
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log_error ("processing mail failed: %s\n", gpg_strerror (err));
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break;
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case aRead:
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if (argc)
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wrong_args ("--read < WKS-DATA");
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err = read_confirmation_request (es_stdin);
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if (err)
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log_error ("processing mail failed: %s\n", gpg_strerror (err));
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break;
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default:
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usage (1);
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break;
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}
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return log_get_errorcount (0)? 1:0;
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}
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struct get_key_status_parm_s
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{
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const char *fpr;
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int found;
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int count;
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};
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static void
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get_key_status_cb (void *opaque, const char *keyword, char *args)
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{
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struct get_key_status_parm_s *parm = opaque;
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/*log_debug ("%s: %s\n", keyword, args);*/
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if (!strcmp (keyword, "EXPORTED"))
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{
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parm->count++;
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if (!ascii_strcasecmp (args, parm->fpr))
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parm->found = 1;
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}
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}
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/* Get a key by fingerprint from gpg's keyring and make sure that the
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* mail address ADDRSPEC is included in the key. The key is returned
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* as a new memory stream at R_KEY.
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*
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* Fixme: After we have implemented import and export filters for gpg
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* this function shall only return a key with just this user id. */
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static gpg_error_t
|
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get_key (estream_t *r_key, const char *fingerprint, const char *addrspec)
|
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{
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gpg_error_t err;
|
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ccparray_t ccp;
|
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const char **argv = NULL;
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estream_t key = NULL;
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struct get_key_status_parm_s parm;
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char *filterexp = NULL;
|
||
|
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memset (&parm, 0, sizeof parm);
|
||
|
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*r_key = NULL;
|
||
|
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key = es_fopenmem (0, "w+b");
|
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if (!key)
|
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{
|
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err = gpg_error_from_syserror ();
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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goto leave;
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}
|
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/* Prefix the key with the MIME content type. */
|
||
es_fputs ("Content-Type: application/pgp-keys\n"
|
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"\n", key);
|
||
|
||
filterexp = es_bsprintf ("keep-uid=mbox = %s", addrspec);
|
||
if (!filterexp)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
ccparray_init (&ccp, 0);
|
||
|
||
ccparray_put (&ccp, "--no-options");
|
||
if (!opt.verbose)
|
||
ccparray_put (&ccp, "--quiet");
|
||
else if (opt.verbose > 1)
|
||
ccparray_put (&ccp, "--verbose");
|
||
ccparray_put (&ccp, "--batch");
|
||
ccparray_put (&ccp, "--status-fd=2");
|
||
ccparray_put (&ccp, "--always-trust");
|
||
ccparray_put (&ccp, "--armor");
|
||
ccparray_put (&ccp, "--export-options=export-minimal");
|
||
ccparray_put (&ccp, "--export-filter");
|
||
ccparray_put (&ccp, filterexp);
|
||
ccparray_put (&ccp, "--export");
|
||
ccparray_put (&ccp, "--");
|
||
ccparray_put (&ccp, fingerprint);
|
||
|
||
ccparray_put (&ccp, NULL);
|
||
argv = ccparray_get (&ccp, NULL);
|
||
if (!argv)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
parm.fpr = fingerprint;
|
||
err = gnupg_exec_tool_stream (opt.gpg_program, argv, NULL,
|
||
NULL, key,
|
||
get_key_status_cb, &parm);
|
||
if (!err && parm.count > 1)
|
||
err = gpg_error (GPG_ERR_TOO_MANY);
|
||
else if (!err && !parm.found)
|
||
err = gpg_error (GPG_ERR_NOT_FOUND);
|
||
if (err)
|
||
{
|
||
log_error ("export failed: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
es_rewind (key);
|
||
*r_key = key;
|
||
key = NULL;
|
||
|
||
leave:
|
||
es_fclose (key);
|
||
xfree (argv);
|
||
xfree (filterexp);
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
decrypt_stream_status_cb (void *opaque, const char *keyword, char *args)
|
||
{
|
||
(void)opaque;
|
||
|
||
if (DBG_CRYPTO)
|
||
log_debug ("gpg status: %s %s\n", keyword, args);
|
||
}
|
||
|
||
|
||
/* Decrypt the INPUT stream to a new stream which is stored at success
|
||
* at R_OUTPUT. */
|
||
static gpg_error_t
|
||
decrypt_stream (estream_t *r_output, estream_t input)
|
||
{
|
||
gpg_error_t err;
|
||
ccparray_t ccp;
|
||
const char **argv;
|
||
estream_t output;
|
||
|
||
*r_output = NULL;
|
||
|
||
output = es_fopenmem (0, "w+b");
|
||
if (!output)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
|
||
return err;
|
||
}
|
||
|
||
ccparray_init (&ccp, 0);
|
||
|
||
ccparray_put (&ccp, "--no-options");
|
||
/* We limit the output to 64 KiB to avoid DoS using compression
|
||
* tricks. A regular client will anyway only send a minimal key;
|
||
* that is one w/o key signatures and attribute packets. */
|
||
ccparray_put (&ccp, "--max-output=0x10000");
|
||
if (!opt.verbose)
|
||
ccparray_put (&ccp, "--quiet");
|
||
else if (opt.verbose > 1)
|
||
ccparray_put (&ccp, "--verbose");
|
||
ccparray_put (&ccp, "--batch");
|
||
ccparray_put (&ccp, "--status-fd=2");
|
||
ccparray_put (&ccp, "--decrypt");
|
||
ccparray_put (&ccp, "--");
|
||
|
||
ccparray_put (&ccp, NULL);
|
||
argv = ccparray_get (&ccp, NULL);
|
||
if (!argv)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
err = gnupg_exec_tool_stream (opt.gpg_program, argv, input,
|
||
NULL, output,
|
||
decrypt_stream_status_cb, NULL);
|
||
if (err)
|
||
{
|
||
log_error ("decryption failed: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
else if (opt.verbose)
|
||
log_info ("decryption succeeded\n");
|
||
|
||
es_rewind (output);
|
||
*r_output = output;
|
||
output = NULL;
|
||
|
||
leave:
|
||
es_fclose (output);
|
||
xfree (argv);
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
|
||
/* Check whether the provider supports the WKS protocol. */
|
||
static gpg_error_t
|
||
command_supported (char *userid)
|
||
{
|
||
gpg_error_t err;
|
||
char *addrspec = NULL;
|
||
char *submission_to = NULL;
|
||
|
||
addrspec = mailbox_from_userid (userid);
|
||
if (!addrspec)
|
||
{
|
||
log_error (_("\"%s\" is not a proper mail address\n"), userid);
|
||
err = gpg_error (GPG_ERR_INV_USER_ID);
|
||
goto leave;
|
||
}
|
||
|
||
/* Get the submission address. */
|
||
err = wkd_get_submission_address (addrspec, &submission_to);
|
||
if (err)
|
||
{
|
||
if (gpg_err_code (err) == GPG_ERR_NO_DATA
|
||
|| gpg_err_code (err) == GPG_ERR_UNKNOWN_HOST)
|
||
{
|
||
if (opt.verbose)
|
||
log_info ("provider for '%s' does NOT support WKS (%s)\n",
|
||
addrspec, gpg_strerror (err));
|
||
err = gpg_error (GPG_ERR_FALSE);
|
||
log_inc_errorcount ();
|
||
}
|
||
goto leave;
|
||
}
|
||
if (opt.verbose)
|
||
log_info ("provider for '%s' supports WKS\n", addrspec);
|
||
|
||
leave:
|
||
xfree (submission_to);
|
||
xfree (addrspec);
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
/* Locate the key by fingerprint and userid and send a publication
|
||
* request. */
|
||
static gpg_error_t
|
||
command_send (const char *fingerprint, char *userid)
|
||
{
|
||
gpg_error_t err;
|
||
KEYDB_SEARCH_DESC desc;
|
||
char *addrspec = NULL;
|
||
estream_t key = NULL;
|
||
estream_t keyenc = NULL;
|
||
char *submission_to = NULL;
|
||
mime_maker_t mime = NULL;
|
||
struct policy_flags_s policy;
|
||
|
||
memset (&policy, 0, sizeof policy);
|
||
|
||
if (classify_user_id (fingerprint, &desc, 1)
|
||
|| !(desc.mode == KEYDB_SEARCH_MODE_FPR
|
||
|| desc.mode == KEYDB_SEARCH_MODE_FPR20))
|
||
{
|
||
log_error (_("\"%s\" is not a fingerprint\n"), fingerprint);
|
||
err = gpg_error (GPG_ERR_INV_NAME);
|
||
goto leave;
|
||
}
|
||
addrspec = mailbox_from_userid (userid);
|
||
if (!addrspec)
|
||
{
|
||
log_error (_("\"%s\" is not a proper mail address\n"), userid);
|
||
err = gpg_error (GPG_ERR_INV_USER_ID);
|
||
goto leave;
|
||
}
|
||
err = get_key (&key, fingerprint, addrspec);
|
||
if (err)
|
||
goto leave;
|
||
|
||
/* Get the submission address. */
|
||
if (fake_submission_addr)
|
||
{
|
||
submission_to = xstrdup (fake_submission_addr);
|
||
err = 0;
|
||
}
|
||
else
|
||
err = wkd_get_submission_address (addrspec, &submission_to);
|
||
if (err)
|
||
goto leave;
|
||
log_info ("submitting request to '%s'\n", submission_to);
|
||
|
||
/* Get the policy flags. */
|
||
if (!fake_submission_addr)
|
||
{
|
||
estream_t mbuf;
|
||
|
||
err = wkd_get_policy_flags (addrspec, &mbuf);
|
||
if (err)
|
||
{
|
||
log_error ("error reading policy flags for '%s': %s\n",
|
||
submission_to, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
if (mbuf)
|
||
{
|
||
err = wks_parse_policy (&policy, mbuf, 1);
|
||
es_fclose (mbuf);
|
||
if (err)
|
||
goto leave;
|
||
}
|
||
}
|
||
|
||
if (policy.auth_submit)
|
||
log_info ("no confirmation required for '%s'\n", addrspec);
|
||
|
||
/* Encrypt the key part. */
|
||
es_rewind (key);
|
||
err = encrypt_response (&keyenc, key, submission_to, fingerprint);
|
||
if (err)
|
||
goto leave;
|
||
es_fclose (key);
|
||
key = NULL;
|
||
|
||
|
||
/* Send the key. */
|
||
err = mime_maker_new (&mime, NULL);
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "From", addrspec);
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "To", submission_to);
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "Subject", "Key publishing request");
|
||
if (err)
|
||
goto leave;
|
||
|
||
/* Tell server that we support draft version 3. */
|
||
err = mime_maker_add_header (mime, "Wks-Draft-Version", "3");
|
||
if (err)
|
||
goto leave;
|
||
|
||
err = mime_maker_add_header (mime, "Content-Type",
|
||
"multipart/encrypted; "
|
||
"protocol=\"application/pgp-encrypted\"");
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_container (mime);
|
||
if (err)
|
||
goto leave;
|
||
|
||
err = mime_maker_add_header (mime, "Content-Type",
|
||
"application/pgp-encrypted");
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_body (mime, "Version: 1\n");
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "Content-Type",
|
||
"application/octet-stream");
|
||
if (err)
|
||
goto leave;
|
||
|
||
err = mime_maker_add_stream (mime, &keyenc);
|
||
if (err)
|
||
goto leave;
|
||
|
||
err = wks_send_mime (mime);
|
||
|
||
leave:
|
||
mime_maker_release (mime);
|
||
xfree (submission_to);
|
||
es_fclose (keyenc);
|
||
es_fclose (key);
|
||
xfree (addrspec);
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
encrypt_response_status_cb (void *opaque, const char *keyword, char *args)
|
||
{
|
||
gpg_error_t *failure = opaque;
|
||
char *fields[2];
|
||
|
||
if (DBG_CRYPTO)
|
||
log_debug ("gpg status: %s %s\n", keyword, args);
|
||
|
||
if (!strcmp (keyword, "FAILURE"))
|
||
{
|
||
if (split_fields (args, fields, DIM (fields)) >= 2
|
||
&& !strcmp (fields[0], "encrypt"))
|
||
*failure = strtoul (fields[1], NULL, 10);
|
||
}
|
||
|
||
}
|
||
|
||
|
||
/* Encrypt the INPUT stream to a new stream which is stored at success
|
||
* at R_OUTPUT. Encryption is done for ADDRSPEC and for FINGERPRINT
|
||
* (so that the sent message may later be inspected by the user). We
|
||
* currently retrieve that key from the WKD, DANE, or from "local".
|
||
* "local" is last to prefer the latest key version but use a local
|
||
* copy in case we are working offline. It might be useful for the
|
||
* server to send the fingerprint of its encryption key - or even the
|
||
* entire key back. */
|
||
static gpg_error_t
|
||
encrypt_response (estream_t *r_output, estream_t input, const char *addrspec,
|
||
const char *fingerprint)
|
||
{
|
||
gpg_error_t err;
|
||
ccparray_t ccp;
|
||
const char **argv;
|
||
estream_t output;
|
||
gpg_error_t gpg_err = 0;
|
||
|
||
*r_output = NULL;
|
||
|
||
output = es_fopenmem (0, "w+b");
|
||
if (!output)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
|
||
return err;
|
||
}
|
||
|
||
ccparray_init (&ccp, 0);
|
||
|
||
ccparray_put (&ccp, "--no-options");
|
||
if (!opt.verbose)
|
||
ccparray_put (&ccp, "--quiet");
|
||
else if (opt.verbose > 1)
|
||
ccparray_put (&ccp, "--verbose");
|
||
ccparray_put (&ccp, "--batch");
|
||
ccparray_put (&ccp, "--status-fd=2");
|
||
ccparray_put (&ccp, "--always-trust");
|
||
ccparray_put (&ccp, "--armor");
|
||
if (fake_submission_addr)
|
||
ccparray_put (&ccp, "--auto-key-locate=clear,local");
|
||
else
|
||
ccparray_put (&ccp, "--auto-key-locate=clear,wkd,dane,local");
|
||
ccparray_put (&ccp, "--recipient");
|
||
ccparray_put (&ccp, addrspec);
|
||
ccparray_put (&ccp, "--recipient");
|
||
ccparray_put (&ccp, fingerprint);
|
||
ccparray_put (&ccp, "--encrypt");
|
||
ccparray_put (&ccp, "--");
|
||
|
||
ccparray_put (&ccp, NULL);
|
||
argv = ccparray_get (&ccp, NULL);
|
||
if (!argv)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
err = gnupg_exec_tool_stream (opt.gpg_program, argv, input,
|
||
NULL, output,
|
||
encrypt_response_status_cb, &gpg_err);
|
||
if (err)
|
||
{
|
||
if (gpg_err)
|
||
err = gpg_err;
|
||
log_error ("encryption failed: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
es_rewind (output);
|
||
*r_output = output;
|
||
output = NULL;
|
||
|
||
leave:
|
||
es_fclose (output);
|
||
xfree (argv);
|
||
return err;
|
||
}
|
||
|
||
|
||
static gpg_error_t
|
||
send_confirmation_response (const char *sender, const char *address,
|
||
const char *nonce, int encrypt,
|
||
const char *fingerprint)
|
||
{
|
||
gpg_error_t err;
|
||
estream_t body = NULL;
|
||
estream_t bodyenc = NULL;
|
||
mime_maker_t mime = NULL;
|
||
|
||
body = es_fopenmem (0, "w+b");
|
||
if (!body)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
|
||
return err;
|
||
}
|
||
|
||
/* It is fine to use 8 bit encoding because that is encrypted and
|
||
* only our client will see it. */
|
||
if (encrypt)
|
||
{
|
||
es_fputs ("Content-Type: application/vnd.gnupg.wks\n"
|
||
"Content-Transfer-Encoding: 8bit\n"
|
||
"\n",
|
||
body);
|
||
}
|
||
|
||
es_fprintf (body, ("type: confirmation-response\n"
|
||
"sender: %s\n"
|
||
"address: %s\n"
|
||
"nonce: %s\n"),
|
||
sender,
|
||
address,
|
||
nonce);
|
||
|
||
es_rewind (body);
|
||
if (encrypt)
|
||
{
|
||
err = encrypt_response (&bodyenc, body, sender, fingerprint);
|
||
if (err)
|
||
goto leave;
|
||
es_fclose (body);
|
||
body = NULL;
|
||
}
|
||
|
||
err = mime_maker_new (&mime, NULL);
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "From", address);
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "To", sender);
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "Subject", "Key publication confirmation");
|
||
if (err)
|
||
goto leave;
|
||
|
||
if (encrypt)
|
||
{
|
||
err = mime_maker_add_header (mime, "Content-Type",
|
||
"multipart/encrypted; "
|
||
"protocol=\"application/pgp-encrypted\"");
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_container (mime);
|
||
if (err)
|
||
goto leave;
|
||
|
||
err = mime_maker_add_header (mime, "Content-Type",
|
||
"application/pgp-encrypted");
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_body (mime, "Version: 1\n");
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_header (mime, "Content-Type",
|
||
"application/octet-stream");
|
||
if (err)
|
||
goto leave;
|
||
|
||
err = mime_maker_add_stream (mime, &bodyenc);
|
||
if (err)
|
||
goto leave;
|
||
}
|
||
else
|
||
{
|
||
err = mime_maker_add_header (mime, "Content-Type",
|
||
"application/vnd.gnupg.wks");
|
||
if (err)
|
||
goto leave;
|
||
err = mime_maker_add_stream (mime, &body);
|
||
if (err)
|
||
goto leave;
|
||
}
|
||
|
||
err = wks_send_mime (mime);
|
||
|
||
leave:
|
||
mime_maker_release (mime);
|
||
es_fclose (bodyenc);
|
||
es_fclose (body);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Reply to a confirmation request. The MSG has already been
|
||
* decrypted and we only need to send the nonce back. */
|
||
static gpg_error_t
|
||
process_confirmation_request (estream_t msg)
|
||
{
|
||
gpg_error_t err;
|
||
nvc_t nvc;
|
||
nve_t item;
|
||
const char *value, *sender, *address, *fingerprint, *nonce;
|
||
|
||
err = nvc_parse (&nvc, NULL, msg);
|
||
if (err)
|
||
{
|
||
log_error ("parsing the WKS message failed: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
if (DBG_MIME)
|
||
{
|
||
log_debug ("request follows:\n");
|
||
nvc_write (nvc, log_get_stream ());
|
||
}
|
||
|
||
/* Check that this is a confirmation request. */
|
||
if (!((item = nvc_lookup (nvc, "type:")) && (value = nve_value (item))
|
||
&& !strcmp (value, "confirmation-request")))
|
||
{
|
||
if (item && value)
|
||
log_error ("received unexpected wks message '%s'\n", value);
|
||
else
|
||
log_error ("received invalid wks message: %s\n", "'type' missing");
|
||
err = gpg_error (GPG_ERR_UNEXPECTED_MSG);
|
||
goto leave;
|
||
}
|
||
|
||
/* Get the fingerprint. */
|
||
if (!((item = nvc_lookup (nvc, "fingerprint:"))
|
||
&& (value = nve_value (item))
|
||
&& strlen (value) >= 40))
|
||
{
|
||
log_error ("received invalid wks message: %s\n",
|
||
"'fingerprint' missing or invalid");
|
||
err = gpg_error (GPG_ERR_INV_DATA);
|
||
goto leave;
|
||
}
|
||
fingerprint = value;
|
||
|
||
/* FIXME: Check that the fingerprint matches the key used to decrypt the
|
||
* message. */
|
||
|
||
/* Get the address. */
|
||
if (!((item = nvc_lookup (nvc, "address:")) && (value = nve_value (item))
|
||
&& is_valid_mailbox (value)))
|
||
{
|
||
log_error ("received invalid wks message: %s\n",
|
||
"'address' missing or invalid");
|
||
err = gpg_error (GPG_ERR_INV_DATA);
|
||
goto leave;
|
||
}
|
||
address = value;
|
||
/* FIXME: Check that the "address" matches the User ID we want to
|
||
* publish. Also get the "fingerprint" and compare that to our to
|
||
* be published key. Further we should make sure that we actually
|
||
* decrypted using that fingerprint (which is a bit problematic if
|
||
* --read is used). */
|
||
|
||
/* Get the sender. */
|
||
if (!((item = nvc_lookup (nvc, "sender:")) && (value = nve_value (item))
|
||
&& is_valid_mailbox (value)))
|
||
{
|
||
log_error ("received invalid wks message: %s\n",
|
||
"'sender' missing or invalid");
|
||
err = gpg_error (GPG_ERR_INV_DATA);
|
||
goto leave;
|
||
}
|
||
sender = value;
|
||
/* FIXME: Check that the "sender" matches the From: address. */
|
||
|
||
/* Get the nonce. */
|
||
if (!((item = nvc_lookup (nvc, "nonce:")) && (value = nve_value (item))
|
||
&& strlen (value) > 16))
|
||
{
|
||
log_error ("received invalid wks message: %s\n",
|
||
"'nonce' missing or too short");
|
||
err = gpg_error (GPG_ERR_INV_DATA);
|
||
goto leave;
|
||
}
|
||
nonce = value;
|
||
|
||
/* Send the confirmation. If no key was found, try again without
|
||
* encryption. */
|
||
err = send_confirmation_response (sender, address, nonce, 1, fingerprint);
|
||
if (gpg_err_code (err) == GPG_ERR_NO_PUBKEY)
|
||
{
|
||
log_info ("no encryption key found - sending response in the clear\n");
|
||
err = send_confirmation_response (sender, address, nonce, 0, NULL);
|
||
}
|
||
|
||
leave:
|
||
nvc_release (nvc);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Read a confirmation request and decrypt it if needed. This
|
||
* function may not be used with a mail or MIME message but only with
|
||
* the actual encrypted or plaintext WKS data. */
|
||
static gpg_error_t
|
||
read_confirmation_request (estream_t msg)
|
||
{
|
||
gpg_error_t err;
|
||
int c;
|
||
estream_t plaintext = NULL;
|
||
|
||
/* We take a really simple approach to check whether MSG is
|
||
* encrypted: We know that an encrypted message is always armored
|
||
* and thus starts with a few dashes. It is even sufficient to
|
||
* check for a single dash, because that can never be a proper first
|
||
* WKS data octet. We need to skip leading spaces, though. */
|
||
while ((c = es_fgetc (msg)) == ' ' || c == '\t' || c == '\r' || c == '\n')
|
||
;
|
||
if (c == EOF)
|
||
{
|
||
log_error ("can't process an empty message\n");
|
||
return gpg_error (GPG_ERR_INV_DATA);
|
||
}
|
||
if (es_ungetc (c, msg) != c)
|
||
{
|
||
log_error ("error ungetting octet from message\n");
|
||
return gpg_error (GPG_ERR_INTERNAL);
|
||
}
|
||
|
||
if (c != '-')
|
||
err = process_confirmation_request (msg);
|
||
else
|
||
{
|
||
err = decrypt_stream (&plaintext, msg);
|
||
if (err)
|
||
log_error ("decryption failed: %s\n", gpg_strerror (err));
|
||
else
|
||
err = process_confirmation_request (plaintext);
|
||
}
|
||
|
||
es_fclose (plaintext);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Called from the MIME receiver to process the plain text data in MSG. */
|
||
static gpg_error_t
|
||
command_receive_cb (void *opaque, const char *mediatype,
|
||
estream_t msg, unsigned int flags)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
(void)opaque;
|
||
(void)flags;
|
||
|
||
if (!strcmp (mediatype, "application/vnd.gnupg.wks"))
|
||
err = read_confirmation_request (msg);
|
||
else
|
||
{
|
||
log_info ("ignoring unexpected message of type '%s'\n", mediatype);
|
||
err = gpg_error (GPG_ERR_UNEXPECTED_MSG);
|
||
}
|
||
|
||
return err;
|
||
}
|