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gnupg/tools/gpg-wks-client.c
Werner Koch 00b877ecda
doc: Typo fix in comment 
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2024-03-06 11:54:33 +01:00

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/* gpg-wks-client.c - A client for the Web Key Service protocols.
* Copyright (C) 2016, 2022 g10 Code GmbH
* Copyright (C) 2016 Bundesamt für Sicherheit in der Informationstechnik
*
* This file is part of GnuPG.
*
* This file 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.
*
* This file 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://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#define INCLUDED_BY_MAIN_MODULE 1
#include "../common/util.h"
#include "../common/status.h"
#include "../common/i18n.h"
#include "../common/sysutils.h"
#include "../common/init.h"
#include "../common/asshelp.h"
#include "../common/userids.h"
#include "../common/ccparray.h"
#include "../common/exectool.h"
#include "../common/mbox-util.h"
#include "../common/name-value.h"
#include "../common/comopt.h"
#include "call-dirmngr.h"
#include "mime-maker.h"
#include "send-mail.h"
#include "gpg-wks.h"
/* Constants to identify the commands and options. */
enum cmd_and_opt_values
{
aNull = 0,
oQuiet = 'q',
oVerbose = 'v',
oOutput = 'o',
oDirectory = 'C',
oDebug = 500,
aSupported,
aCheck,
aCreate,
aReceive,
aRead,
aMirror,
aInstallKey,
aRemoveKey,
aPrintWKDHash,
aPrintWKDURL,
oGpgProgram,
oSend,
oFakeSubmissionAddr,
oStatusFD,
oWithColons,
oBlacklist,
oNoAutostart,
oAddRevocs,
oNoAddRevocs,
oRealClean,
oDummy
};
/* The list of commands and options. */
static gpgrt_opt_t opts[] = {
ARGPARSE_group (300, ("@Commands:\n ")),
ARGPARSE_c (aSupported, "supported",
("check whether provider supports WKS")),
ARGPARSE_c (aCheck, "check",
("check whether a key is available")),
ARGPARSE_c (aCreate, "create",
("create a publication request")),
ARGPARSE_c (aReceive, "receive",
("receive a MIME confirmation request")),
ARGPARSE_c (aRead, "read",
("receive a plain text confirmation request")),
ARGPARSE_c (aMirror, "mirror",
"mirror an LDAP directory"),
ARGPARSE_c (aInstallKey, "install-key",
"install a key into a directory"),
ARGPARSE_c (aRemoveKey, "remove-key",
"remove a key from a directory"),
ARGPARSE_c (aPrintWKDHash, "print-wkd-hash",
"print the WKD identifier for the given user ids"),
ARGPARSE_c (aPrintWKDURL, "print-wkd-url",
"print the WKD URL for the given user id"),
ARGPARSE_group (301, ("@\nOptions:\n ")),
ARGPARSE_s_n (oVerbose, "verbose", ("verbose")),
ARGPARSE_s_n (oQuiet, "quiet", ("be somewhat more quiet")),
ARGPARSE_s_s (oDebug, "debug", "@"),
ARGPARSE_s_s (oGpgProgram, "gpg", "@"),
ARGPARSE_s_n (oSend, "send", "send the mail using sendmail"),
ARGPARSE_s_s (oOutput, "output", "|FILE|write the mail to FILE"),
ARGPARSE_s_i (oStatusFD, "status-fd", N_("|FD|write status info to this FD")),
ARGPARSE_s_n (oNoAutostart, "no-autostart", "@"),
ARGPARSE_s_n (oWithColons, "with-colons", "@"),
ARGPARSE_s_s (oBlacklist, "blacklist", "@"),
ARGPARSE_s_s (oDirectory, "directory", "@"),
ARGPARSE_s_n (oAddRevocs, "add-revocs", "@"),
ARGPARSE_s_n (oNoAddRevocs, "no-add-revocs", "do not add revocation certificates"),
ARGPARSE_s_n (oRealClean, "realclean", "remove most key signatures"),
ARGPARSE_s_s (oFakeSubmissionAddr, "fake-submission-addr", "@"),
ARGPARSE_end ()
};
/* The list of supported debug flags. */
static struct debug_flags_s debug_flags [] =
{
{ DBG_MIME_VALUE , "mime" },
{ DBG_PARSER_VALUE , "parser" },
{ DBG_CRYPTO_VALUE , "crypto" },
{ DBG_MEMORY_VALUE , "memory" },
{ DBG_MEMSTAT_VALUE, "memstat" },
{ DBG_IPC_VALUE , "ipc" },
{ DBG_EXTPROG_VALUE, "extprog" },
{ 0, NULL }
};
/* Value of the option --fake-submission-addr. */
const char *fake_submission_addr;
/* An array with blacklisted addresses and its length. Use
* is_in_blacklist to check. */
static char **blacklist_array;
static size_t blacklist_array_len;
static void wrong_args (const char *t1, const char *t2) GPGRT_ATTR_NORETURN;
static void add_blacklist (const char *fname);
static gpg_error_t proc_userid_from_stdin (gpg_error_t (*func)(const char *),
const char *text);
static gpg_error_t command_supported (char *userid);
static gpg_error_t command_check (char *userid);
static gpg_error_t command_create (const char *fingerprint, const char *userid);
static gpg_error_t encrypt_response (estream_t *r_output, estream_t input,
const char *addrspec,
const char *fingerprint);
static gpg_error_t read_confirmation_request (estream_t msg);
static gpg_error_t command_receive_cb (void *opaque,
const char *mediatype, estream_t fp,
unsigned int flags);
static gpg_error_t command_mirror (char *domain[]);
/* Print usage information and provide strings for help. */
static const char *
my_strusage( int level )
{
const char *p;
switch (level)
{
case 9: p = "LGPL-2.1-or-later"; break;
case 11: p = "gpg-wks-client"; break;
case 12: p = "@GNUPG@"; break;
case 13: p = VERSION; break;
case 14: p = GNUPG_DEF_COPYRIGHT_LINE; break;
case 17: p = PRINTABLE_OS_NAME; break;
case 19: p = ("Please report bugs to <@EMAIL@>.\n"); break;
case 1:
case 40:
p = ("Usage: gpg-wks-client [command] [options] [args] (-h for help)");
break;
case 41:
p = ("Syntax: gpg-wks-client [command] [options] [args]\n"
"Client for the Web Key Service\n");
break;
default: p = NULL; break;
}
return p;
}
static void
wrong_args (const char *text, const char *text2)
{
#if GPGRT_VERSION_NUMBER >= 0x013000 /* >= 1.48 */
/* Skip the leading dashes if build with command support. */
if (text[0] == '-' && text[1] == '-' && text[2])
text += 2;
#endif
es_fprintf (es_stderr, _("usage: %s %s [options] %s\n"),
gpgrt_strusage (11), text, text2);
exit (2);
}
/* Command line parsing. */
static enum cmd_and_opt_values
parse_arguments (gpgrt_argparse_t *pargs, gpgrt_opt_t *popts)
{
enum cmd_and_opt_values cmd = 0;
int no_more_options = 0;
while (!no_more_options && gpgrt_argparse (NULL, pargs, popts))
{
switch (pargs->r_opt)
{
case oQuiet: opt.quiet = 1; break;
case oVerbose: opt.verbose++; break;
case oDebug:
if (parse_debug_flag (pargs->r.ret_str, &opt.debug, debug_flags))
{
pargs->r_opt = ARGPARSE_INVALID_ARG;
pargs->err = ARGPARSE_PRINT_ERROR;
}
break;
case oGpgProgram:
opt.gpg_program = make_filename (pargs->r.ret_str, NULL);
break;
case oDirectory:
opt.directory = make_filename (pargs->r.ret_str, NULL);
break;
case oSend:
opt.use_sendmail = 1;
break;
case oOutput:
opt.output = make_filename (pargs->r.ret_str, NULL);
break;
case oFakeSubmissionAddr:
fake_submission_addr = pargs->r.ret_str;
break;
case oStatusFD:
wks_set_status_fd (translate_sys2libc_fd_int (pargs->r.ret_int, 1));
break;
case oWithColons:
opt.with_colons = 1;
break;
case oNoAutostart:
opt.no_autostart = 1;
break;
case oBlacklist:
add_blacklist (pargs->r.ret_str);
break;
case oAddRevocs:
opt.add_revocs = 1;
break;
case oNoAddRevocs:
opt.add_revocs = 0;
break;
case oRealClean:
opt.realclean = 1;
break;
case aSupported:
case aCreate:
case aReceive:
case aRead:
case aCheck:
case aMirror:
case aInstallKey:
case aRemoveKey:
case aPrintWKDHash:
case aPrintWKDURL:
cmd = pargs->r_opt;
break;
default: pargs->err = ARGPARSE_PRINT_ERROR; break;
}
}
return cmd;
}
/* gpg-wks-client main. */
int
main (int argc, char **argv)
{
gpg_error_t err, delayed_err;
gpgrt_argparse_t pargs;
enum cmd_and_opt_values cmd;
gnupg_reopen_std ("gpg-wks-client");
gpgrt_set_strusage (my_strusage);
log_set_prefix ("gpg-wks-client", GPGRT_LOG_WITH_PREFIX);
/* Make sure that our subsystems are ready. */
i18n_init();
init_common_subsystems (&argc, &argv);
assuan_set_gpg_err_source (GPG_ERR_SOURCE_DEFAULT);
setup_libassuan_logging (&opt.debug, NULL);
opt.add_revocs = 1; /* Default add revocation certs. */
/* Parse the command line. */
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags = ARGPARSE_FLAG_KEEP;
#if GPGRT_VERSION_NUMBER >= 0x013000 /* >= 1.48 */
pargs.flags |= ARGPARSE_FLAG_COMMAND;
#endif
cmd = parse_arguments (&pargs, opts);
gpgrt_argparse (NULL, &pargs, NULL);
/* Check if gpg is build with sendmail support */
if (opt.use_sendmail && !NAME_OF_SENDMAIL[0])
{
err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
log_error ("sending mail is not supported in this build: %s\n",
gpg_strerror (err));
}
if (log_get_errorcount (0))
exit (2);
/* Process common component options. Note that we set the config
* dir only here so that --homedir will have an effect. */
gpgrt_set_confdir (GPGRT_CONFDIR_SYS, gnupg_sysconfdir ());
gpgrt_set_confdir (GPGRT_CONFDIR_USER, gnupg_homedir ());
if (parse_comopt (GNUPG_MODULE_NAME_CONNECT_AGENT, opt.verbose > 1))
exit(2);
if (comopt.no_autostart)
opt.no_autostart = 1;
/* Print a warning if an argument looks like an option. */
if (!opt.quiet && !(pargs.flags & ARGPARSE_FLAG_STOP_SEEN))
{
int i;
for (i=0; i < argc; i++)
if (argv[i][0] == '-' && argv[i][1] == '-')
log_info (("NOTE: '%s' is not considered an option\n"), argv[i]);
}
/* Set defaults for non given options. */
if (!opt.gpg_program)
opt.gpg_program = xstrdup (gnupg_module_name (GNUPG_MODULE_NAME_GPG));
if (!opt.directory)
opt.directory = "openpgpkey";
/* Tell call-dirmngr what options we want. */
set_dirmngr_options (opt.verbose, (opt.debug & DBG_IPC_VALUE),
!opt.no_autostart);
/* Check that the top directory exists. */
if (cmd == aInstallKey || cmd == aRemoveKey || cmd == aMirror)
{
struct stat sb;
if (gnupg_stat (opt.directory, &sb))
{
err = gpg_error_from_syserror ();
log_error ("error accessing directory '%s': %s\n",
opt.directory, gpg_strerror (err));
goto leave;
}
if (!S_ISDIR(sb.st_mode))
{
log_error ("error accessing directory '%s': %s\n",
opt.directory, "not a directory");
err = gpg_error (GPG_ERR_ENOENT);
goto leave;
}
}
/* Run the selected command. */
switch (cmd)
{
case aSupported:
if (opt.with_colons)
{
for (; argc; argc--, argv++)
command_supported (*argv);
err = 0;
}
else
{
if (argc != 1)
wrong_args ("--supported", "DOMAIN");
err = command_supported (argv[0]);
if (err && gpg_err_code (err) != GPG_ERR_FALSE)
log_error ("checking support failed: %s\n", gpg_strerror (err));
}
break;
case aCreate:
if (argc != 2)
wrong_args ("--create", "FINGERPRINT USER-ID");
err = command_create (argv[0], argv[1]);
if (err)
log_error ("creating request failed: %s\n", gpg_strerror (err));
break;
case aReceive:
if (argc)
wrong_args ("--receive", "< MIME-DATA");
err = wks_receive (es_stdin, command_receive_cb, NULL);
if (err)
log_error ("processing mail failed: %s\n", gpg_strerror (err));
break;
case aRead:
if (argc)
wrong_args ("--read", "< WKS-DATA");
err = read_confirmation_request (es_stdin);
if (err)
log_error ("processing mail failed: %s\n", gpg_strerror (err));
break;
case aCheck:
if (argc != 1)
wrong_args ("--check", "USER-ID");
err = command_check (argv[0]);
break;
case aMirror:
if (!argc)
err = command_mirror (NULL);
else
err = command_mirror (argv);
break;
case aInstallKey:
if (!argc)
err = wks_cmd_install_key (NULL, NULL);
else if (argc == 2)
err = wks_cmd_install_key (*argv, argv[1]);
else
wrong_args ("--install-key", "[FILE|FINGERPRINT USER-ID]");
break;
case aRemoveKey:
if (argc != 1)
wrong_args ("--remove-key", "USER-ID");
err = wks_cmd_remove_key (*argv);
break;
case aPrintWKDHash:
case aPrintWKDURL:
if (!argc)
{
if (cmd == aPrintWKDHash)
err = proc_userid_from_stdin (wks_cmd_print_wkd_hash,
"printing WKD hash");
else
err = proc_userid_from_stdin (wks_cmd_print_wkd_url,
"printing WKD URL");
}
else
{
for (err = delayed_err = 0; !err && argc; argc--, argv++)
{
if (cmd == aPrintWKDHash)
err = wks_cmd_print_wkd_hash (*argv);
else
err = wks_cmd_print_wkd_url (*argv);
if (gpg_err_code (err) == GPG_ERR_INV_USER_ID)
{
/* Diagnostic already printed. */
delayed_err = err;
err = 0;
}
else if (err)
log_error ("printing hash failed: %s\n", gpg_strerror (err));
}
if (!err)
err = delayed_err;
}
break;
default:
gpgrt_usage (1);
err = 0;
break;
}
leave:
if (err)
wks_write_status (STATUS_FAILURE, "- %u", err);
else if (log_get_errorcount (0))
wks_write_status (STATUS_FAILURE, "- %u", GPG_ERR_GENERAL);
else
wks_write_status (STATUS_SUCCESS, NULL);
return (err || log_get_errorcount (0))? 1:0;
}
/* Read a file FNAME into a buffer and return that malloced buffer.
* Caller must free the buffer. On error NULL is returned, on success
* the valid length of the buffer is stored at R_LENGTH. The returned
* buffer is guaranteed to be Nul terminated. */
static char *
read_file (const char *fname, size_t *r_length)
{
estream_t fp;
char *buf;
size_t buflen;
if (!strcmp (fname, "-"))
{
size_t nread, bufsize = 0;
fp = es_stdin;
es_set_binary (fp);
buf = NULL;
buflen = 0;
#define NCHUNK 32767
do
{
bufsize += NCHUNK;
if (!buf)
buf = xmalloc (bufsize+1);
else
buf = xrealloc (buf, bufsize+1);
nread = es_fread (buf+buflen, 1, NCHUNK, fp);
if (nread < NCHUNK && es_ferror (fp))
{
log_error ("error reading '[stdin]': %s\n", strerror (errno));
xfree (buf);
return NULL;
}
buflen += nread;
}
while (nread == NCHUNK);
#undef NCHUNK
}
else
{
struct stat st;
fp = es_fopen (fname, "rb");
if (!fp)
{
log_error ("can't open '%s': %s\n", fname, strerror (errno));
return NULL;
}
if (fstat (es_fileno (fp), &st))
{
log_error ("can't stat '%s': %s\n", fname, strerror (errno));
es_fclose (fp);
return NULL;
}
buflen = st.st_size;
buf = xmalloc (buflen+1);
if (es_fread (buf, buflen, 1, fp) != 1)
{
log_error ("error reading '%s': %s\n", fname, strerror (errno));
es_fclose (fp);
xfree (buf);
return NULL;
}
es_fclose (fp);
}
buf[buflen] = 0;
if (r_length)
*r_length = buflen;
return buf;
}
static int
cmp_blacklist (const void *arg_a, const void *arg_b)
{
const char *a = *(const char **)arg_a;
const char *b = *(const char **)arg_b;
return strcmp (a, b);
}
/* Add a blacklist to our global table. This is called during option
* parsing and thus any use of log_error will eventually stop further
* processing. */
static void
add_blacklist (const char *fname)
{
char *buffer;
char *p, *pend;
char **array;
size_t arraysize, arrayidx;
buffer = read_file (fname, NULL);
if (!buffer)
return;
/* Estimate the number of entries by counting the non-comment lines. */
arraysize = 2; /* For the first and an extra NULL item. */
for (p=buffer; *p; p++)
if (*p == '\n' && p[1] && p[1] != '#')
arraysize++;
array = xcalloc (arraysize, sizeof *array);
arrayidx = 0;
/* Loop over all lines. */
for (p = buffer; p && *p; p = pend)
{
pend = strchr (p, '\n');
if (pend)
*pend++ = 0;
trim_spaces (p);
if (!*p || *p == '#' )
continue;
ascii_strlwr (p);
log_assert (arrayidx < arraysize);
array[arrayidx] = p;
arrayidx++;
}
log_assert (arrayidx < arraysize);
qsort (array, arrayidx, sizeof *array, cmp_blacklist);
blacklist_array = array;
blacklist_array_len = arrayidx;
gpgrt_annotate_leaked_object (buffer);
gpgrt_annotate_leaked_object (blacklist_array);
}
/* Return true if NAME is in a blacklist. */
static int
is_in_blacklist (const char *name)
{
if (!name || !blacklist_array)
return 0;
return !!bsearch (&name, blacklist_array, blacklist_array_len,
sizeof *blacklist_array, cmp_blacklist);
}
/* Read user ids from stdin and call FUNC for each user id. TEXT is
* used for error messages. */
static gpg_error_t
proc_userid_from_stdin (gpg_error_t (*func)(const char *), const char *text)
{
gpg_error_t err = 0;
gpg_error_t delayed_err = 0;
char line[2048];
size_t n = 0;
/* If we are on a terminal disable buffering to get direct response. */
if (gnupg_isatty (es_fileno (es_stdin))
&& gnupg_isatty (es_fileno (es_stdout)))
{
es_setvbuf (es_stdin, NULL, _IONBF, 0);
es_setvbuf (es_stdout, NULL, _IOLBF, 0);
}
while (es_fgets (line, sizeof line - 1, es_stdin))
{
n = strlen (line);
if (!n || line[n-1] != '\n')
{
err = gpg_error (*line? GPG_ERR_LINE_TOO_LONG
: GPG_ERR_INCOMPLETE_LINE);
log_error ("error reading stdin: %s\n", gpg_strerror (err));
break;
}
trim_spaces (line);
err = func (line);
if (gpg_err_code (err) == GPG_ERR_INV_USER_ID)
{
delayed_err = err;
err = 0;
}
else if (err)
log_error ("%s failed: %s\n", text, gpg_strerror (err));
}
if (es_ferror (es_stdin))
{
err = gpg_error_from_syserror ();
log_error ("error reading stdin: %s\n", gpg_strerror (err));
goto leave;
}
leave:
if (!err)
err = delayed_err;
return err;
}
/* Add the user id UID to the key identified by FINGERPRINT. */
static gpg_error_t
add_user_id (const char *fingerprint, const char *uid)
{
gpg_error_t err;
ccparray_t ccp;
const char **argv = NULL;
ccparray_init (&ccp, 0);
ccparray_put (&ccp, "--no-options");
if (opt.verbose < 2)
ccparray_put (&ccp, "--quiet");
else
ccparray_put (&ccp, "--verbose");
ccparray_put (&ccp, "--batch");
ccparray_put (&ccp, "--always-trust");
ccparray_put (&ccp, "--quick-add-uid");
ccparray_put (&ccp, fingerprint);
ccparray_put (&ccp, uid);
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, NULL,
NULL, NULL,
NULL, NULL);
if (err)
{
log_error ("adding user id failed: %s\n", gpg_strerror (err));
goto leave;
}
leave:
xfree (argv);
return err;
}
struct decrypt_stream_parm_s
{
char *fpr;
char *mainfpr;
int otrust;
};
static void
decrypt_stream_status_cb (void *opaque, const char *keyword, char *args)
{
struct decrypt_stream_parm_s *decinfo = opaque;
if (DBG_CRYPTO)
log_debug ("gpg status: %s %s\n", keyword, args);
if (!strcmp (keyword, "DECRYPTION_KEY") && !decinfo->fpr)
{
const char *fields[3];
if (split_fields (args, fields, DIM (fields)) >= 3)
{
decinfo->fpr = xstrdup (fields[0]);
decinfo->mainfpr = xstrdup (fields[1]);
decinfo->otrust = *fields[2];
}
}
}
/* 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, struct decrypt_stream_parm_s *decinfo,
estream_t input)
{
gpg_error_t err;
ccparray_t ccp;
const char **argv;
estream_t output;
*r_output = NULL;
memset (decinfo, 0, sizeof *decinfo);
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 < 2)
ccparray_put (&ccp, "--quiet");
else
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, decinfo);
if (!err && (!decinfo->fpr || !decinfo->mainfpr || !decinfo->otrust))
err = gpg_error (GPG_ERR_INV_ENGINE);
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:
if (err)
{
xfree (decinfo->fpr);
xfree (decinfo->mainfpr);
memset (decinfo, 0, sizeof *decinfo);
}
es_fclose (output);
xfree (argv);
return err;
}
/* Return the submission address for the address or just the domain in
* ADDRSPEC. The submission address is stored as a malloced string at
* R_SUBMISSION_ADDRESS. At R_POLICY the policy flags of the domain
* are stored. The caller needs to free them with wks_free_policy.
* The function returns an error code on failure to find a submission
* address or policy file. Note: The function may store NULL at
* R_SUBMISSION_ADDRESS but return success to indicate that the web
* key directory is supported but not the web key service. As per WKD
* specs a policy file is always required and will thus be return on
* success. */
static gpg_error_t
get_policy_and_sa (const char *addrspec, int silent,
policy_flags_t *r_policy, char **r_submission_address)
{
gpg_error_t err;
estream_t mbuf = NULL;
const char *domain;
const char *s;
policy_flags_t policy = NULL;
char *submission_to = NULL;
*r_submission_address = NULL;
*r_policy = NULL;
domain = strchr (addrspec, '@');
if (domain)
domain++;
if (opt.with_colons)
{
s = domain? domain : addrspec;
es_write_sanitized (es_stdout, s, strlen (s), ":", NULL);
es_putc (':', es_stdout);
}
/* We first try to get the submission address from the policy file
* (this is the new method). If both are available we check that
* they match and print a warning if not. In the latter case we
* keep on using the one from the submission-address file. */
err = wkd_get_policy_flags (addrspec, &mbuf);
if (err && gpg_err_code (err) != GPG_ERR_NO_DATA
&& gpg_err_code (err) != GPG_ERR_NO_NAME)
{
if (!opt.with_colons)
log_error ("error reading policy flags for '%s': %s\n",
domain, gpg_strerror (err));
goto leave;
}
if (!mbuf)
{
if (!opt.with_colons)
log_error ("provider for '%s' does NOT support the Web Key Directory\n",
addrspec);
err = gpg_error (GPG_ERR_FALSE);
goto leave;
}
policy = xtrycalloc (1, sizeof *policy);
if (!policy)
err = gpg_error_from_syserror ();
else
err = wks_parse_policy (policy, mbuf, 1);
es_fclose (mbuf);
mbuf = NULL;
if (err)
goto leave;
err = wkd_get_submission_address (addrspec, &submission_to);
if (err && !policy->submission_address)
{
if (!silent && !opt.with_colons)
log_error (_("error looking up submission address for domain '%s'"
": %s\n"), domain, gpg_strerror (err));
if (!silent && gpg_err_code (err) == GPG_ERR_NO_DATA && !opt.with_colons)
log_error (_("this domain probably doesn't support WKS.\n"));
goto leave;
}
if (submission_to && policy->submission_address
&& ascii_strcasecmp (submission_to, policy->submission_address))
log_info ("Warning: different submission addresses (sa=%s, po=%s)\n",
submission_to, policy->submission_address);
if (!submission_to && policy->submission_address)
{
submission_to = xtrystrdup (policy->submission_address);
if (!submission_to)
{
err = gpg_error_from_syserror ();
goto leave;
}
}
leave:
*r_submission_address = submission_to;
submission_to = NULL;
*r_policy = policy;
policy = NULL;
if (opt.with_colons)
{
if (*r_policy && !*r_submission_address)
es_fprintf (es_stdout, "1:0::");
else if (*r_policy && *r_submission_address)
es_fprintf (es_stdout, "1:1::");
else if (err && !(gpg_err_code (err) == GPG_ERR_FALSE
|| gpg_err_code (err) == GPG_ERR_NO_DATA
|| gpg_err_code (err) == GPG_ERR_UNKNOWN_HOST))
es_fprintf (es_stdout, "0:0:%d:", err);
else
es_fprintf (es_stdout, "0:0::");
if (*r_policy)
{
es_fprintf (es_stdout, "%u:%u:%u:",
(*r_policy)->protocol_version,
(*r_policy)->auth_submit,
(*r_policy)->mailbox_only);
}
es_putc ('\n', es_stdout);
}
xfree (submission_to);
wks_free_policy (policy);
xfree (policy);
es_fclose (mbuf);
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;
policy_flags_t policy = NULL;
if (!strchr (userid, '@'))
{
char *tmp = xstrconcat ("foo@", userid, NULL);
addrspec = mailbox_from_userid (tmp, 0);
xfree (tmp);
}
else
addrspec = mailbox_from_userid (userid, 0);
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 = get_policy_and_sa (addrspec, 1, &policy, &submission_to);
if (err || !submission_to)
{
if (!submission_to
|| gpg_err_code (err) == GPG_ERR_FALSE
|| gpg_err_code (err) == GPG_ERR_NO_DATA
|| gpg_err_code (err) == GPG_ERR_UNKNOWN_HOST
)
{
/* FALSE is returned if we already figured out that even the
* Web Key Directory is not supported and thus printed an
* error message. */
if (opt.verbose && gpg_err_code (err) != GPG_ERR_FALSE
&& !opt.with_colons)
{
if (gpg_err_code (err) == GPG_ERR_NO_DATA)
log_info ("provider for '%s' does NOT support WKS\n",
addrspec);
else
log_info ("provider for '%s' does NOT support WKS (%s)\n",
addrspec, gpg_strerror (err));
}
err = gpg_error (GPG_ERR_FALSE);
if (!opt.with_colons)
log_inc_errorcount ();
}
goto leave;
}
if (opt.verbose && !opt.with_colons)
log_info ("provider for '%s' supports WKS\n", addrspec);
leave:
wks_free_policy (policy);
xfree (policy);
xfree (submission_to);
xfree (addrspec);
return err;
}
/* Check whether the key for USERID is available in the WKD. */
static gpg_error_t
command_check (char *userid)
{
gpg_error_t err;
char *addrspec = NULL;
estream_t key = NULL;
char *fpr = NULL;
uidinfo_list_t mboxes = NULL;
uidinfo_list_t sl;
int found = 0;
addrspec = mailbox_from_userid (userid, 0);
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_key (addrspec, &key);
switch (gpg_err_code (err))
{
case 0:
if (opt.verbose)
log_info ("public key for '%s' found via WKD\n", addrspec);
/* Fixme: Check that the key contains the user id. */
break;
case GPG_ERR_NO_DATA: /* No such key. */
if (opt.verbose)
log_info ("public key for '%s' NOT found via WKD\n", addrspec);
err = gpg_error (GPG_ERR_NO_PUBKEY);
log_inc_errorcount ();
break;
case GPG_ERR_UNKNOWN_HOST:
if (opt.verbose)
log_info ("error looking up '%s' via WKD: %s\n",
addrspec, gpg_strerror (err));
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
break;
default:
log_error ("error looking up '%s' via WKD: %s\n",
addrspec, gpg_strerror (err));
break;
}
if (err)
goto leave;
/* Look closer at the key. */
err = wks_list_key (key, &fpr, &mboxes);
if (err)
{
log_error ("error parsing key: %s\n", gpg_strerror (err));
err = gpg_error (GPG_ERR_NO_PUBKEY);
goto leave;
}
if (opt.verbose)
log_info ("fingerprint: %s\n", fpr);
for (sl = mboxes; sl; sl = sl->next)
{
if (sl->mbox && !strcmp (sl->mbox, addrspec))
found = 1;
if (opt.verbose)
{
log_info (" user-id: %s\n", sl->uid);
log_info (" created: %s\n", asctimestamp (sl->created));
if (sl->mbox)
log_info (" addr-spec: %s\n", sl->mbox);
if (sl->expired || sl->revoked)
log_info (" flags:%s%s\n",
sl->expired? " expired":"", sl->revoked?" revoked":"");
}
}
if (!found)
{
log_error ("public key for '%s' has no user id with the mail address\n",
addrspec);
err = gpg_error (GPG_ERR_CERT_REVOKED);
}
else if (opt.output)
{
/* Save to file. */
const char *fname = opt.output;
if (*fname == '-' && !fname[1])
fname = NULL;
es_rewind (key);
err = wks_write_to_file (key, fname);
if (err)
log_error ("writing key to '%s' failed: %s\n",
fname? fname : "[stdout]", gpg_strerror (err));
}
leave:
xfree (fpr);
free_uidinfo_list (mboxes);
es_fclose (key);
xfree (addrspec);
return err;
}
/* Locate the key by fingerprint and userid and send a publication
* request. */
static gpg_error_t
command_create (const char *fingerprint, const 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;
policy_flags_t policy = NULL;
int no_encrypt = 0;
int posteo_hack = 0;
const char *domain;
uidinfo_list_t uidlist = NULL;
uidinfo_list_t uid, thisuid;
time_t thistime;
int any;
if (classify_user_id (fingerprint, &desc, 1)
|| desc.mode != KEYDB_SEARCH_MODE_FPR)
{
log_error (_("\"%s\" is not a fingerprint\n"), fingerprint);
err = gpg_error (GPG_ERR_INV_NAME);
goto leave;
}
addrspec = mailbox_from_userid (userid, 0);
if (!addrspec)
{
log_error (_("\"%s\" is not a proper mail address\n"), userid);
err = gpg_error (GPG_ERR_INV_USER_ID);
goto leave;
}
err = wks_get_key (&key, fingerprint, addrspec, 0, 1);
if (err)
goto leave;
domain = strchr (addrspec, '@');
log_assert (domain);
domain++;
/* Get the submission address. */
if (fake_submission_addr)
{
policy = xcalloc (1, sizeof *policy);
submission_to = xstrdup (fake_submission_addr);
err = 0;
}
else
{
err = get_policy_and_sa (addrspec, 0, &policy, &submission_to);
if (err)
goto leave;
if (!submission_to)
{
log_error (_("this domain probably doesn't support WKS.\n"));
err = gpg_error (GPG_ERR_NO_DATA);
goto leave;
}
}
log_info ("submitting request to '%s'\n", submission_to);
if (policy->auth_submit)
log_info ("no confirmation required for '%s'\n", addrspec);
/* In case the key has several uids with the same addr-spec we will
* use the newest one. */
err = wks_list_key (key, NULL, &uidlist);
if (err)
{
log_error ("error parsing key: %s\n",gpg_strerror (err));
err = gpg_error (GPG_ERR_NO_PUBKEY);
goto leave;
}
thistime = 0;
thisuid = NULL;
any = 0;
for (uid = uidlist; uid; uid = uid->next)
{
if (!uid->mbox)
continue; /* Should not happen anyway. */
if (policy->mailbox_only && ascii_strcasecmp (uid->uid, uid->mbox))
continue; /* UID has more than just the mailbox. */
if (uid->expired)
{
if (opt.verbose)
log_info ("ignoring expired user id '%s'\n", uid->uid);
continue;
}
any = 1;
if (uid->created > thistime)
{
thistime = uid->created;
thisuid = uid;
}
}
if (!thisuid)
thisuid = uidlist; /* This is the case for a missing timestamp. */
if (!any)
{
log_error ("public key %s has no mail address '%s'\n",
fingerprint, addrspec);
err = gpg_error (GPG_ERR_INV_USER_ID);
goto leave;
}
if (opt.verbose)
log_info ("submitting key with user id '%s'\n", thisuid->uid);
/* If we have more than one user id we need to filter the key to
* include only THISUID. */
if (uidlist->next)
{
estream_t newkey;
es_rewind (key);
err = wks_filter_uid (&newkey, key, thisuid->uid, 1);
if (err)
{
log_error ("error filtering key: %s\n", gpg_strerror (err));
err = gpg_error (GPG_ERR_NO_PUBKEY);
goto leave;
}
es_fclose (key);
key = newkey;
}
if (policy->mailbox_only
&& (!thisuid->mbox || ascii_strcasecmp (thisuid->uid, thisuid->mbox)))
{
log_info ("Warning: policy requires 'mailbox-only'"
" - adding user id '%s'\n", addrspec);
err = add_user_id (fingerprint, addrspec);
if (err)
goto leave;
/* Need to get the key again. This time we request filtering
* for the full user id, so that we do not need check and filter
* the key again. */
es_fclose (key);
key = NULL;
err = wks_get_key (&key, fingerprint, addrspec, 1, 1);
if (err)
goto leave;
}
if (opt.add_revocs)
{
if (es_fseek (key, 0, SEEK_END))
{
err = gpg_error_from_syserror ();
log_error ("error seeking stream: %s\n", gpg_strerror (err));
goto leave;
}
err = wks_find_add_revocs (key, addrspec);
if (err)
{
log_error ("error finding revocations for '%s': %s\n",
addrspec, gpg_strerror (err));
goto leave;
}
}
/* Now put the armor around the key. */
{
estream_t newkey;
es_rewind (key);
err = wks_armor_key (&newkey, key,
no_encrypt? NULL
/* */ : ("Content-Type: application/pgp-keys\n"
"\n"));
if (err)
{
log_error ("error armoring key: %s\n", gpg_strerror (err));
goto leave;
}
es_fclose (key);
key = newkey;
}
/* Hack to support posteo but let them disable this by setting the
* new policy-version flag. */
if (policy->protocol_version < 3
&& !ascii_strcasecmp (domain, "posteo.de"))
{
log_info ("Warning: Using draft-1 method for domain '%s'\n", domain);
no_encrypt = 1;
posteo_hack = 1;
}
/* Encrypt the key part. */
if (!no_encrypt)
{
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 which draft we support. */
err = mime_maker_add_header (mime, "Wks-Draft-Version",
STR2(WKS_DRAFT_VERSION));
if (err)
goto leave;
if (no_encrypt)
{
void *data;
size_t datalen;
if (posteo_hack)
{
/* Needs a multipart/mixed with one(!) attachment. It does
* not grok a non-multipart mail. */
err = mime_maker_add_header (mime, "Content-Type", "multipart/mixed");
if (err)
goto leave;
err = mime_maker_add_container (mime);
if (err)
goto leave;
}
err = mime_maker_add_header (mime, "Content-type",
"application/pgp-keys");
if (err)
goto leave;
if (es_fclose_snatch (key, &data, &datalen))
{
err = gpg_error_from_syserror ();
goto leave;
}
key = NULL;
err = mime_maker_add_body_data (mime, data, datalen);
xfree (data);
if (err)
goto leave;
}
else
{
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);
free_uidinfo_list (uidlist);
es_fclose (keyenc);
es_fclose (key);
wks_free_policy (policy);
xfree (policy);
xfree (addrspec);
return err;
}
static void
encrypt_response_status_cb (void *opaque, const char *keyword, char *args)
{
gpg_error_t *failure = opaque;
const 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 < 2)
ccparray_put (&ccp, "--quiet");
else
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, "-z0"); /* No compression for improved robustness. */
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;
err = mime_maker_add_header (mime, "Wks-Draft-Version",
STR2(WKS_DRAFT_VERSION));
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. MAINFPR is
* either NULL or the primary key fingerprint of the key used to
* decrypt the request. */
static gpg_error_t
process_confirmation_request (estream_t msg, const char *mainfpr)
{
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;
/* Check that the fingerprint matches the key used to decrypt the
* message. In --read mode or with the old format we don't have the
* decryption key; thus we can't bail out. */
if (!mainfpr || ascii_strcasecmp (mainfpr, fingerprint))
{
log_info ("target fingerprint: %s\n", fingerprint);
log_info ("but decrypted with: %s\n", mainfpr);
log_error ("confirmation request not decrypted with target key\n");
if (mainfpr)
{
err = gpg_error (GPG_ERR_INV_DATA);
goto leave;
}
}
/* 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. */
/* 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);
}
if (!err)
log_info ("response sent to '%s' for '%s'\n", sender, address);
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, NULL);
else
{
struct decrypt_stream_parm_s decinfo;
err = decrypt_stream (&plaintext, &decinfo, msg);
if (err)
log_error ("decryption failed: %s\n", gpg_strerror (err));
else if (decinfo.otrust != 'u')
{
err = gpg_error (GPG_ERR_WRONG_SECKEY);
log_error ("key used to decrypt the confirmation request"
" was not generated by us (otrust=%c)\n", decinfo.otrust);
}
else
err = process_confirmation_request (plaintext, decinfo.mainfpr);
xfree (decinfo.fpr);
xfree (decinfo.mainfpr);
}
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;
}
/* An object used to communicate with the mirror_one_key callback. */
struct
{
const char *domain;
int anyerror;
unsigned int nkeys; /* Number of keys processed. */
unsigned int nuids; /* Number of published user ids. */
} mirror_one_key_parm;
/* Return true if the Given a mail DOMAIN and the full addrspec MBOX
* match. */
static int
domain_matches_mbox (const char *domain, const char *mbox)
{
const char *s;
if (!domain || !mbox)
return 0;
s = strchr (domain, '@');
if (s)
domain = s+1;
if (!*domain)
return 0; /* Not a valid domain. */
s = strchr (mbox, '@');
if (!s || !s[1])
return 0; /* Not a valid mbox. */
mbox = s+1;
return !ascii_strcasecmp (domain, mbox);
}
/* Core of mirror_one_key with the goal of mirroring just one uid.
* UIDLIST is used to figure out whether the given MBOX occurs several
* times in UIDLIST and then to single out the newest one. This is
* so that for a key with
* uid: Joe Someone <joe@example.org>
* uid: Joe <joe@example.org>
* only the newest user id (and thus its self-signature) is used.
* UIDLIST is nodified to set all MBOX fields to NULL for a processed
* user id. FPR is the fingerprint of the key.
*/
static gpg_error_t
mirror_one_keys_userid (estream_t key, const char *mbox, uidinfo_list_t uidlist,
const char *fpr)
{
gpg_error_t err;
uidinfo_list_t uid, thisuid, firstuid;
time_t thistime;
estream_t newkey = NULL;
/* Find the UID we want to use. */
thistime = 0;
thisuid = firstuid = NULL;
for (uid = uidlist; uid; uid = uid->next)
{
if ((uid->flags & 1) || !uid->mbox || strcmp (uid->mbox, mbox))
continue; /* Already processed or no matching mbox. */
uid->flags |= 1; /* Set "processed" flag. */
if (!firstuid)
firstuid = uid;
if (uid->created > thistime)
{
thistime = uid->created;
thisuid = uid;
}
}
if (!thisuid)
thisuid = firstuid; /* This is the case for a missing timestamp. */
if (!thisuid)
{
log_error ("error finding the user id for %s (%s)\n", fpr, mbox);
err = gpg_error (GPG_ERR_NO_USER_ID);
goto leave;
}
/* Always filter the key so that the result will be non-armored. */
es_rewind (key);
err = wks_filter_uid (&newkey, key, thisuid->uid, 1);
if (err)
{
log_error ("error filtering key %s: %s\n", fpr, gpg_strerror (err));
err = gpg_error (GPG_ERR_NO_PUBKEY);
goto leave;
}
if (opt.add_revocs)
{
if (es_fseek (newkey, 0, SEEK_END))
{
err = gpg_error_from_syserror ();
log_error ("error seeking stream: %s\n", gpg_strerror (err));
goto leave;
}
err = wks_find_add_revocs (newkey, mbox);
if (err)
{
log_error ("error finding revocations for '%s': %s\n",
mbox, gpg_strerror (err));
goto leave;
}
es_rewind (newkey);
}
err = wks_install_key_core (newkey, mbox);
if (opt.verbose)
log_info ("key %s published for '%s'\n", fpr, mbox);
mirror_one_key_parm.nuids++;
if (!opt.quiet && !(mirror_one_key_parm.nuids % 25))
log_info ("%u user ids from %d keys so far\n",
mirror_one_key_parm.nuids, mirror_one_key_parm.nkeys);
leave:
es_fclose (newkey);
return err;
}
/* The callback used by command_mirror. It received an estream with
* one key and should return success to process the next key. */
static gpg_error_t
mirror_one_key (estream_t key)
{
gpg_error_t err = 0;
char *fpr;
uidinfo_list_t uidlist = NULL;
uidinfo_list_t uid;
const char *domain = mirror_one_key_parm.domain;
/* List the key to get all user ids. */
err = wks_list_key (key, &fpr, &uidlist);
if (err)
{
log_error ("error parsing a key: %s - skipped\n",
gpg_strerror (err));
mirror_one_key_parm.anyerror = 1;
err = 0;
goto leave;
}
for (uid = uidlist; uid; uid = uid->next)
{
if (!uid->mbox || (uid->flags & 1))
continue; /* No mail box or already processed. */
if (uid->expired)
continue;
if (*domain && !domain_matches_mbox (domain, uid->mbox))
continue; /* We don't want this one. */
if (is_in_blacklist (uid->mbox))
continue;
err = mirror_one_keys_userid (key, uid->mbox, uidlist, fpr);
if (err)
{
log_error ("error processing key %s: %s - skipped\n",
fpr, gpg_strerror (err));
mirror_one_key_parm.anyerror = 1;
err = 0;
goto leave;
}
}
mirror_one_key_parm.nkeys++;
leave:
free_uidinfo_list (uidlist);
xfree (fpr);
return err;
}
/* Copy the keys from the configured LDAP server into a local WKD.
* DOMAINLIST is an array of domain names to restrict the copy to only
* the given domains; if it is NULL all keys are mirrored. */
static gpg_error_t
command_mirror (char *domainlist[])
{
gpg_error_t err;
const char *domain;
char *domainbuf = NULL;
mirror_one_key_parm.anyerror = 0;
mirror_one_key_parm.nkeys = 0;
mirror_one_key_parm.nuids = 0;
if (!domainlist)
{
mirror_one_key_parm.domain = "";
err = wkd_dirmngr_ks_get (NULL, mirror_one_key);
}
else
{
while ((domain = *domainlist++))
{
if (*domain != '.' && domain[1] != '@')
{
/* This does not already specify a mail search by
* domain. Change it. */
xfree (domainbuf);
domainbuf = xstrconcat (".@", domain, NULL);
domain = domainbuf;
}
mirror_one_key_parm.domain = domain;
if (opt.verbose)
log_info ("mirroring keys for domain '%s'\n", domain+2);
err = wkd_dirmngr_ks_get (domain, mirror_one_key);
if (err)
break;
}
}
if (!opt.quiet)
log_info ("a total of %u user ids from %d keys published\n",
mirror_one_key_parm.nuids, mirror_one_key_parm.nkeys);
if (err)
log_error ("error mirroring LDAP directory: %s <%s>\n",
gpg_strerror (err), gpg_strsource (err));
else if (mirror_one_key_parm.anyerror)
log_info ("warning: errors encountered - not all keys are mirrored\n");
xfree (domainbuf);
return err;
}
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