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-rw-r--r--tools/gpg-wks-server.c2058
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diff --git a/tools/gpg-wks-server.c b/tools/gpg-wks-server.c
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+++ b/tools/gpg-wks-server.c
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+/* gpg-wks-server.c - A server for the Web Key Service protocols.
+ * Copyright (C) 2016, 2018 Werner Koch
+ * 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
+ */
+
+/* The Web Key Service I-D defines an update protocol to store a
+ * public key in the Web Key Directory. The current specification is
+ * draft-koch-openpgp-webkey-service-05.txt.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+
+#define INCLUDED_BY_MAIN_MODULE 1
+#include "../common/util.h"
+#include "../common/init.h"
+#include "../common/sysutils.h"
+#include "../common/userids.h"
+#include "../common/ccparray.h"
+#include "../common/exectool.h"
+#include "../common/zb32.h"
+#include "../common/mbox-util.h"
+#include "../common/name-value.h"
+#include "mime-maker.h"
+#include "send-mail.h"
+#include "gpg-wks.h"
+
+
+/* The time we wait for a confirmation response. */
+#define PENDING_TTL (86400 * 3) /* 3 days. */
+
+
+/* Constants to identify the commands and options. */
+enum cmd_and_opt_values
+ {
+ aNull = 0,
+
+ oQuiet = 'q',
+ oVerbose = 'v',
+ oOutput = 'o',
+ oDirectory = 'C',
+
+ oDebug = 500,
+
+ aReceive,
+ aCron,
+ aListDomains,
+ aInstallKey,
+ aRevokeKey,
+ aRemoveKey,
+ aCheck,
+
+ oGpgProgram,
+ oSend,
+ oFrom,
+ oHeader,
+ oWithDir,
+ oWithFile,
+
+ oDummy
+ };
+
+
+/* The list of commands and options. */
+static ARGPARSE_OPTS opts[] = {
+ ARGPARSE_group (300, ("@Commands:\n ")),
+
+ ARGPARSE_c (aReceive, "receive",
+ ("receive a submission or confirmation")),
+ ARGPARSE_c (aCron, "cron",
+ ("run regular jobs")),
+ ARGPARSE_c (aListDomains, "list-domains",
+ ("list configured domains")),
+ ARGPARSE_c (aCheck, "check",
+ ("check whether a key is installed")),
+ ARGPARSE_c (aCheck, "check-key", "@"),
+ ARGPARSE_c (aInstallKey, "install-key",
+ "install a key from FILE into the WKD"),
+ ARGPARSE_c (aRemoveKey, "remove-key",
+ "remove a key from the WKD"),
+ ARGPARSE_c (aRevokeKey, "revoke-key",
+ "mark a key as revoked"),
+
+ 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_s (oDirectory, "directory", "|DIR|use DIR as top directory"),
+ ARGPARSE_s_s (oFrom, "from", "|ADDR|use ADDR as the default sender"),
+ ARGPARSE_s_s (oHeader, "header" ,
+ "|NAME=VALUE|add \"NAME: VALUE\" as header to all mails"),
+ ARGPARSE_s_n (oWithDir, "with-dir", "@"),
+ ARGPARSE_s_n (oWithFile, "with-file", "@"),
+
+ 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 }
+ };
+
+
+/* State for processing a message. */
+struct server_ctx_s
+{
+ char *fpr;
+ uidinfo_list_t mboxes; /* List with addr-specs taken from the UIDs. */
+ unsigned int draft_version_2:1; /* Client supports the draft 2. */
+};
+typedef struct server_ctx_s *server_ctx_t;
+
+
+/* Flag for --with-dir. */
+static int opt_with_dir;
+/* Flag for --with-file. */
+static int opt_with_file;
+
+
+/* Prototypes. */
+static gpg_error_t get_domain_list (strlist_t *r_list);
+
+static gpg_error_t command_receive_cb (void *opaque,
+ const char *mediatype, estream_t fp,
+ unsigned int flags);
+static gpg_error_t command_list_domains (void);
+static gpg_error_t command_revoke_key (const char *mailaddr);
+static gpg_error_t command_check_key (const char *mailaddr);
+static gpg_error_t command_cron (void);
+
+
+
+/* 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-server"; 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-server command [options] (-h for help)");
+ break;
+ case 41:
+ p = ("Syntax: gpg-wks-server command [options]\n"
+ "Server for the Web Key Service protocol\n");
+ break;
+
+ default: p = NULL; break;
+ }
+ return p;
+}
+
+
+static void
+wrong_args (const char *text)
+{
+ es_fprintf (es_stderr, "usage: %s [options] %s\n", strusage (11), text);
+ exit (2);
+}
+
+
+
+/* Command line parsing. */
+static enum cmd_and_opt_values
+parse_arguments (ARGPARSE_ARGS *pargs, ARGPARSE_OPTS *popts)
+{
+ enum cmd_and_opt_values cmd = 0;
+ int no_more_options = 0;
+
+ while (!no_more_options && gnupg_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 = pargs->r.ret_str;
+ break;
+ case oDirectory:
+ opt.directory = pargs->r.ret_str;
+ break;
+ case oFrom:
+ opt.default_from = pargs->r.ret_str;
+ break;
+ case oHeader:
+ append_to_strlist (&opt.extra_headers, pargs->r.ret_str);
+ break;
+ case oSend:
+ opt.use_sendmail = 1;
+ break;
+ case oOutput:
+ opt.output = pargs->r.ret_str;
+ break;
+ case oWithDir:
+ opt_with_dir = 1;
+ break;
+ case oWithFile:
+ opt_with_file = 1;
+ break;
+
+ case aReceive:
+ case aCron:
+ case aListDomains:
+ case aCheck:
+ case aInstallKey:
+ case aRemoveKey:
+ case aRevokeKey:
+ cmd = pargs->r_opt;
+ break;
+
+ default: pargs->err = ARGPARSE_PRINT_ERROR; break;
+ }
+ }
+
+ return cmd;
+}
+
+
+
+/* gpg-wks-server main. */
+int
+main (int argc, char **argv)
+{
+ gpg_error_t err, firsterr;
+ ARGPARSE_ARGS pargs;
+ enum cmd_and_opt_values cmd;
+
+ gnupg_reopen_std ("gpg-wks-server");
+ set_strusage (my_strusage);
+ log_set_prefix ("gpg-wks-server", GPGRT_LOG_WITH_PREFIX);
+
+ /* Make sure that our subsystems are ready. */
+ init_common_subsystems (&argc, &argv);
+
+ /* Parse the command line. */
+ pargs.argc = &argc;
+ pargs.argv = &argv;
+ pargs.flags = ARGPARSE_FLAG_KEEP;
+ cmd = parse_arguments (&pargs, opts);
+ gnupg_argparse (NULL, &pargs, NULL); /* Release internal state. */
+
+ if (log_get_errorcount (0))
+ exit (2);
+
+ /* 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 = gnupg_module_name (GNUPG_MODULE_NAME_GPG);
+
+ if (!opt.directory)
+ opt.directory = "/var/lib/gnupg/wks";
+
+ /* Check for syntax errors in the --header option to avoid later
+ * error messages with a not easy to find cause */
+ if (opt.extra_headers)
+ {
+ strlist_t sl;
+
+ for (sl = opt.extra_headers; sl; sl = sl->next)
+ {
+ err = mime_maker_add_header (NULL, sl->d, NULL);
+ if (err)
+ log_error ("syntax error in \"--header %s\": %s\n",
+ sl->d, gpg_strerror (err));
+ }
+ }
+
+ if (log_get_errorcount (0))
+ exit (2);
+
+
+ /* Check that we have a working directory. */
+#if defined(HAVE_STAT)
+ {
+ 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));
+ exit (2);
+ }
+ if (!S_ISDIR(sb.st_mode))
+ {
+ log_error ("error accessing directory '%s': %s\n",
+ opt.directory, "not a directory");
+ exit (2);
+ }
+ if (sb.st_uid != getuid())
+ {
+ log_error ("directory '%s' not owned by user\n", opt.directory);
+ exit (2);
+ }
+ if ((sb.st_mode & (S_IROTH|S_IWOTH)))
+ {
+ log_error ("directory '%s' has too relaxed permissions\n",
+ opt.directory);
+ log_info ("Fix by running: chmod o-rw '%s'\n", opt.directory);
+ exit (2);
+ }
+ }
+#else /*!HAVE_STAT*/
+ log_fatal ("program build w/o stat() call\n");
+#endif /*!HAVE_STAT*/
+
+ /* Run the selected command. */
+ switch (cmd)
+ {
+ case aReceive:
+ if (argc)
+ wrong_args ("--receive");
+ err = wks_receive (es_stdin, command_receive_cb, NULL);
+ break;
+
+ case aCron:
+ if (argc)
+ wrong_args ("--cron");
+ err = command_cron ();
+ break;
+
+ case aListDomains:
+ err = command_list_domains ();
+ 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 aRevokeKey:
+ if (argc != 1)
+ wrong_args ("--revoke-key USER-ID");
+ err = command_revoke_key (*argv);
+ break;
+
+ case aCheck:
+ if (!argc)
+ wrong_args ("--check USER-IDs");
+ firsterr = 0;
+ for (; argc; argc--, argv++)
+ {
+ err = command_check_key (*argv);
+ if (!firsterr)
+ firsterr = err;
+ }
+ err = firsterr;
+ break;
+
+ default:
+ usage (1);
+ err = gpg_error (GPG_ERR_BUG);
+ break;
+ }
+
+ if (err)
+ log_error ("command failed: %s\n", gpg_strerror (err));
+ return log_get_errorcount (0)? 1:0;
+}
+
+
+/* Take the key in KEYFILE and write it to OUTFILE in binary encoding.
+ * If ADDRSPEC is given only matching user IDs are included in the
+ * output. */
+static gpg_error_t
+copy_key_as_binary (const char *keyfile, const char *outfile,
+ const char *addrspec)
+{
+ gpg_error_t err;
+ ccparray_t ccp;
+ const char **argv = NULL;
+ char *filterexp = NULL;
+
+ if (addrspec)
+ {
+ 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, "--yes");
+ ccparray_put (&ccp, "--always-trust");
+ ccparray_put (&ccp, "--no-keyring");
+ ccparray_put (&ccp, "--output");
+ ccparray_put (&ccp, outfile);
+ ccparray_put (&ccp, "--import-options=import-export");
+ if (filterexp)
+ {
+ ccparray_put (&ccp, "--import-filter");
+ ccparray_put (&ccp, filterexp);
+ }
+ ccparray_put (&ccp, "--import");
+ ccparray_put (&ccp, "--");
+ ccparray_put (&ccp, keyfile);
+
+ 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 ("%s failed: %s\n", __func__, gpg_strerror (err));
+ goto leave;
+ }
+
+ leave:
+ xfree (filterexp);
+ xfree (argv);
+ return err;
+}
+
+
+/* Take the key in KEYFILE and write it to DANEFILE using the DANE
+ * output format. */
+static gpg_error_t
+copy_key_as_dane (const char *keyfile, const char *danefile)
+{
+ gpg_error_t err;
+ ccparray_t ccp;
+ const char **argv;
+
+ 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, "--yes");
+ ccparray_put (&ccp, "--always-trust");
+ ccparray_put (&ccp, "--no-keyring");
+ ccparray_put (&ccp, "--output");
+ ccparray_put (&ccp, danefile);
+ ccparray_put (&ccp, "--export-options=export-dane");
+ ccparray_put (&ccp, "--import-options=import-export");
+ ccparray_put (&ccp, "--import");
+ ccparray_put (&ccp, "--");
+ ccparray_put (&ccp, keyfile);
+
+ 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 ("%s failed: %s\n", __func__, gpg_strerror (err));
+ goto leave;
+ }
+
+ leave:
+ xfree (argv);
+ return err;
+}
+
+
+static void
+encrypt_stream_status_cb (void *opaque, const char *keyword, char *args)
+{
+ (void)opaque;
+
+ if (DBG_CRYPTO)
+ log_debug ("gpg status: %s %s\n", keyword, args);
+}
+
+
+/* Encrypt the INPUT stream to a new stream which is stored at success
+ * at R_OUTPUT. Encryption is done for the key in file KEYFIL. */
+static gpg_error_t
+encrypt_stream (estream_t *r_output, estream_t input, const char *keyfile)
+{
+ 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");
+ 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, "--no-keyring");
+ ccparray_put (&ccp, "--armor");
+ ccparray_put (&ccp, "-z0"); /* No compression for improved robustness. */
+ ccparray_put (&ccp, "--recipient-file");
+ ccparray_put (&ccp, keyfile);
+ 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_stream_status_cb, NULL);
+ if (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 void
+sign_stream_status_cb (void *opaque, const char *keyword, char *args)
+{
+ (void)opaque;
+
+ if (DBG_CRYPTO)
+ log_debug ("gpg status: %s %s\n", keyword, args);
+}
+
+/* Sign the INPUT stream to a new stream which is stored at success at
+ * R_OUTPUT. A detached signature is created using the key specified
+ * by USERID. */
+static gpg_error_t
+sign_stream (estream_t *r_output, estream_t input, const char *userid)
+{
+ 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");
+ 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, "--armor");
+ ccparray_put (&ccp, "--local-user");
+ ccparray_put (&ccp, userid);
+ ccparray_put (&ccp, "--detach-sign");
+ 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,
+ sign_stream_status_cb, NULL);
+ if (err)
+ {
+ log_error ("signing failed: %s\n", gpg_strerror (err));
+ goto leave;
+ }
+
+ es_rewind (output);
+ *r_output = output;
+ output = NULL;
+
+ leave:
+ es_fclose (output);
+ xfree (argv);
+ return err;
+}
+
+
+/* Get the submission address for address MBOX. Caller must free the
+ * value. If no address can be found NULL is returned. */
+static char *
+get_submission_address (const char *mbox)
+{
+ gpg_error_t err;
+ const char *domain;
+ char *fname, *line, *p;
+ size_t n;
+ estream_t fp;
+
+ domain = strchr (mbox, '@');
+ if (!domain)
+ return NULL;
+ domain++;
+
+ fname = make_filename_try (opt.directory, domain, "submission-address", NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("make_filename failed in %s: %s\n",
+ __func__, gpg_strerror (err));
+ return NULL;
+ }
+
+ fp = es_fopen (fname, "r");
+ if (!fp)
+ {
+ err = gpg_error_from_syserror ();
+ if (gpg_err_code (err) == GPG_ERR_ENOENT)
+ log_info ("Note: no specific submission address configured"
+ " for domain '%s'\n", domain);
+ else
+ log_error ("error reading '%s': %s\n", fname, gpg_strerror (err));
+ xfree (fname);
+ return NULL;
+ }
+
+ line = NULL;
+ n = 0;
+ if (es_getline (&line, &n, fp) < 0)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error reading '%s': %s\n", fname, gpg_strerror (err));
+ xfree (line);
+ es_fclose (fp);
+ xfree (fname);
+ return NULL;
+ }
+ es_fclose (fp);
+ xfree (fname);
+
+ p = strchr (line, '\n');
+ if (p)
+ *p = 0;
+ trim_spaces (line);
+ if (!is_valid_mailbox (line))
+ {
+ log_error ("invalid submission address for domain '%s' detected\n",
+ domain);
+ xfree (line);
+ return NULL;
+ }
+
+ return line;
+}
+
+
+/* Get the policy flags for address MBOX and store them in POLICY. */
+static gpg_error_t
+get_policy_flags (policy_flags_t policy, const char *mbox)
+{
+ gpg_error_t err;
+ const char *domain;
+ char *fname;
+ estream_t fp;
+
+ memset (policy, 0, sizeof *policy);
+
+ domain = strchr (mbox, '@');
+ if (!domain)
+ return gpg_error (GPG_ERR_INV_USER_ID);
+ domain++;
+
+ fname = make_filename_try (opt.directory, domain, "policy", NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("make_filename failed in %s: %s\n",
+ __func__, gpg_strerror (err));
+ return err;
+ }
+
+ fp = es_fopen (fname, "r");
+ if (!fp)
+ {
+ err = gpg_error_from_syserror ();
+ if (gpg_err_code (err) == GPG_ERR_ENOENT)
+ err = 0;
+ else
+ log_error ("error reading '%s': %s\n", fname, gpg_strerror (err));
+ xfree (fname);
+ return err;
+ }
+
+ err = wks_parse_policy (policy, fp, 0);
+ es_fclose (fp);
+ xfree (fname);
+ return err;
+}
+
+
+/* Create the name for the pending file from NONCE and ADDRSPEC and
+ * store it at R_NAME. */
+static gpg_error_t
+make_pending_fname (const char *nonce, const char *addrspec, char **r_name)
+{
+ gpg_error_t err = 0;
+ const char *domain;
+ char *addrspechash = NULL;
+ char sha1buf[20];
+
+ *r_name = NULL;
+
+ domain = addrspec? strchr (addrspec, '@') : NULL;
+ if (!domain || !domain[1] || domain == addrspec)
+ {
+ err = gpg_error (GPG_ERR_INV_ARG);
+ goto leave;
+ }
+ domain++;
+ if (strchr (domain, '/') || strchr (domain, '\\'))
+ {
+ log_info ("invalid domain detected ('%s')\n", domain);
+ err = gpg_error (GPG_ERR_NOT_FOUND);
+ goto leave;
+ }
+ gcry_md_hash_buffer (GCRY_MD_SHA1, sha1buf, addrspec, domain - addrspec - 1);
+ addrspechash = zb32_encode (sha1buf, 8*20);
+ if (!addrspechash)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ *r_name = strconcat (nonce, ".", addrspechash, NULL);
+ if (!*r_name)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ leave:
+ xfree (addrspechash);
+ return err;
+}
+
+
+/* We store the key under the name of the nonce we will then send to
+ * the user. On success the nonce is stored at R_NONCE and the file
+ * name at R_FNAME. ADDRSPEC is used as part of the pending file name
+ * so that the nonce is associated with an address */
+static gpg_error_t
+store_key_as_pending (const char *dir, estream_t key, const char *addrspec,
+ char **r_nonce, char **r_fname)
+{
+ gpg_error_t err;
+ char *dname = NULL;
+ char *fname = NULL;
+ char *nonce = NULL;
+ char *pendingname = NULL;
+ estream_t outfp = NULL;
+ char buffer[1024];
+ size_t nbytes, nwritten;
+
+ *r_nonce = NULL;
+ *r_fname = NULL;
+
+ dname = make_filename_try (dir, "pending", NULL);
+ if (!dname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ /* Create the nonce. We use 20 bytes so that we don't waste a
+ * character in our zBase-32 encoding. Using the gcrypt's nonce
+ * function is faster than using the strong random function; this is
+ * Good Enough for our purpose. */
+ log_assert (sizeof buffer > 20);
+ gcry_create_nonce (buffer, 20);
+ nonce = zb32_encode (buffer, 8 * 20);
+ memset (buffer, 0, 20); /* Not actually needed but it does not harm. */
+ if (!nonce)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ err = make_pending_fname (nonce, addrspec, &pendingname);
+ if (err)
+ goto leave;
+
+ fname = strconcat (dname, "/", pendingname, NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ /* With 128 bits of random we can expect that no other file exists
+ * under this name. We use "x" to detect internal errors. */
+ outfp = es_fopen (fname, "wbx,mode=-rw");
+ if (!outfp)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error creating '%s': %s\n", fname, gpg_strerror (err));
+ goto leave;
+ }
+ es_rewind (key);
+ for (;;)
+ {
+ if (es_read (key, buffer, sizeof buffer, &nbytes))
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error reading '%s': %s\n",
+ es_fname_get (key), gpg_strerror (err));
+ break;
+ }
+
+ if (!nbytes)
+ {
+ err = 0;
+ goto leave; /* Ready. */
+ }
+ if (es_write (outfp, buffer, nbytes, &nwritten))
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error writing '%s': %s\n", fname, gpg_strerror (err));
+ goto leave;
+ }
+ else if (nwritten != nbytes)
+ {
+ err = gpg_error (GPG_ERR_EIO);
+ log_error ("error writing '%s': %s\n", fname, "short write");
+ goto leave;
+ }
+ }
+
+ leave:
+ if (err)
+ {
+ es_fclose (outfp);
+ gnupg_remove (fname);
+ }
+ else if (es_fclose (outfp))
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error closing '%s': %s\n", fname, gpg_strerror (err));
+ }
+
+ if (!err)
+ {
+ *r_nonce = nonce;
+ *r_fname = fname;
+ }
+ else
+ {
+ xfree (nonce);
+ xfree (fname);
+ }
+ xfree (dname);
+ xfree (pendingname);
+ return err;
+}
+
+
+/* Send a confirmation request. DIR is the directory used for the
+ * address MBOX. NONCE is the nonce we want to see in the response to
+ * this mail. FNAME the name of the file with the key. */
+static gpg_error_t
+send_confirmation_request (server_ctx_t ctx,
+ const char *mbox, const char *nonce,
+ const char *keyfile)
+{
+ gpg_error_t err;
+ estream_t body = NULL;
+ estream_t bodyenc = NULL;
+ estream_t signeddata = NULL;
+ estream_t signature = NULL;
+ mime_maker_t mime = NULL;
+ char *from_buffer = NULL;
+ const char *from;
+ strlist_t sl;
+
+ from = from_buffer = get_submission_address (mbox);
+ if (!from)
+ {
+ from = opt.default_from;
+ if (!from)
+ {
+ log_error ("no sender address found for '%s'\n", mbox);
+ err = gpg_error (GPG_ERR_CONFIGURATION);
+ goto leave;
+ }
+ log_info ("Note: using default sender address '%s'\n", from);
+ }
+
+ body = es_fopenmem (0, "w+b");
+ if (!body)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
+ goto leave;
+ }
+
+ if (!ctx->draft_version_2)
+ {
+ /* It is fine to use 8 bit encoding because that is encrypted and
+ * only our client will see it. */
+ es_fputs ("Content-Type: application/vnd.gnupg.wks\n"
+ "Content-Transfer-Encoding: 8bit\n"
+ "\n",
+ body);
+ }
+
+ es_fprintf (body, ("type: confirmation-request\n"
+ "sender: %s\n"
+ "address: %s\n"
+ "fingerprint: %s\n"
+ "nonce: %s\n"),
+ from,
+ mbox,
+ ctx->fpr,
+ nonce);
+
+ es_rewind (body);
+ err = encrypt_stream (&bodyenc, body, keyfile);
+ 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", from);
+ if (err)
+ goto leave;
+ err = mime_maker_add_header (mime, "To", mbox);
+ if (err)
+ goto leave;
+ err = mime_maker_add_header (mime, "Subject", "Confirm your key publication");
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_header (mime, "Wks-Draft-Version",
+ STR2(WKS_DRAFT_VERSION));
+ if (err)
+ goto leave;
+
+ /* Help Enigmail to identify messages. Note that this is in no way
+ * secured. */
+ err = mime_maker_add_header (mime, "WKS-Phase", "confirm");
+ if (err)
+ goto leave;
+
+ for (sl = opt.extra_headers; sl; sl = sl->next)
+ {
+ err = mime_maker_add_header (mime, sl->d, NULL);
+ if (err)
+ goto leave;
+ }
+
+ if (!ctx->draft_version_2)
+ {
+ 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
+ {
+ unsigned int partid;
+
+ /* FIXME: Add micalg. */
+ err = mime_maker_add_header (mime, "Content-Type",
+ "multipart/signed; "
+ "protocol=\"application/pgp-signature\"");
+ if (err)
+ goto leave;
+ err = mime_maker_add_container (mime);
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_header (mime, "Content-Type", "multipart/mixed");
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_container (mime);
+ if (err)
+ goto leave;
+ partid = mime_maker_get_partid (mime);
+
+ err = mime_maker_add_header (mime, "Content-Type", "text/plain");
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_body
+ (mime,
+ "This message has been send to confirm your request\n"
+ "to publish your key. If you did not request a key\n"
+ "publication, simply ignore this message.\n"
+ "\n"
+ "Most mail software can handle this kind of message\n"
+ "automatically and thus you would not have seen this\n"
+ "message. It seems that your client does not fully\n"
+ "support this service. The web page\n"
+ "\n"
+ " https://gnupg.org/faq/wkd.html\n"
+ "\n"
+ "explains how you can process this message anyway in\n"
+ "a few manual steps.\n");
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_header (mime, "Content-Type",
+ "application/vnd.gnupg.wks");
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_stream (mime, &bodyenc);
+ if (err)
+ goto leave;
+
+ err = mime_maker_end_container (mime);
+ if (err)
+ goto leave;
+
+ /* mime_maker_dump_tree (mime); */
+ err = mime_maker_get_part (mime, partid, &signeddata);
+ if (err)
+ goto leave;
+
+ err = sign_stream (&signature, signeddata, from);
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_header (mime, "Content-Type",
+ "application/pgp-signature");
+ if (err)
+ goto leave;
+
+ err = mime_maker_add_stream (mime, &signature);
+ if (err)
+ goto leave;
+ }
+
+ err = wks_send_mime (mime);
+
+ leave:
+ mime_maker_release (mime);
+ es_fclose (signature);
+ es_fclose (signeddata);
+ es_fclose (bodyenc);
+ es_fclose (body);
+ xfree (from_buffer);
+ return err;
+}
+
+
+/* Store the key given by KEY into the pending directory and send a
+ * confirmation requests. */
+static gpg_error_t
+process_new_key (server_ctx_t ctx, estream_t key)
+{
+ gpg_error_t err;
+ uidinfo_list_t sl;
+ const char *s;
+ char *dname = NULL;
+ char *nonce = NULL;
+ char *fname = NULL;
+ struct policy_flags_s policybuf;
+
+ memset (&policybuf, 0, sizeof policybuf);
+
+ /* First figure out the user id from the key. */
+ xfree (ctx->fpr);
+ free_uidinfo_list (ctx->mboxes);
+ err = wks_list_key (key, &ctx->fpr, &ctx->mboxes);
+ if (err)
+ goto leave;
+ log_assert (ctx->fpr);
+ log_info ("fingerprint: %s\n", ctx->fpr);
+ for (sl = ctx->mboxes; sl; sl = sl->next)
+ {
+ if (sl->mbox)
+ log_info (" addr-spec: %s\n", sl->mbox);
+ }
+
+ /* Walk over all user ids and send confirmation requests for those
+ * we support. */
+ for (sl = ctx->mboxes; sl; sl = sl->next)
+ {
+ if (!sl->mbox)
+ continue;
+ s = strchr (sl->mbox, '@');
+ log_assert (s && s[1]);
+ xfree (dname);
+ dname = make_filename_try (opt.directory, s+1, NULL);
+ if (!dname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ if (gnupg_access (dname, W_OK))
+ {
+ log_info ("skipping address '%s': Domain not configured\n", sl->mbox);
+ continue;
+ }
+ if (get_policy_flags (&policybuf, sl->mbox))
+ {
+ log_info ("skipping address '%s': Bad policy flags\n", sl->mbox);
+ continue;
+ }
+
+ if (policybuf.auth_submit)
+ {
+ /* Bypass the confirmation stuff and publish the key as is. */
+ log_info ("publishing address '%s'\n", sl->mbox);
+ /* FIXME: We need to make sure that we do this only for the
+ * address in the mail. */
+ log_debug ("auth-submit not yet working!\n");
+ }
+ else
+ {
+ log_info ("storing address '%s'\n", sl->mbox);
+
+ xfree (nonce);
+ xfree (fname);
+ err = store_key_as_pending (dname, key, sl->mbox, &nonce, &fname);
+ if (err)
+ goto leave;
+
+ err = send_confirmation_request (ctx, sl->mbox, nonce, fname);
+ if (err)
+ goto leave;
+ }
+ }
+
+ leave:
+ if (nonce)
+ wipememory (nonce, strlen (nonce));
+ xfree (nonce);
+ xfree (fname);
+ xfree (dname);
+ wks_free_policy (&policybuf);
+ return err;
+}
+
+
+
+/* Send a message to tell the user at MBOX that their key has been
+ * published. FNAME the name of the file with the key. */
+static gpg_error_t
+send_congratulation_message (const char *mbox, const char *keyfile)
+{
+ gpg_error_t err;
+ estream_t body = NULL;
+ estream_t bodyenc = NULL;
+ mime_maker_t mime = NULL;
+ char *from_buffer = NULL;
+ const char *from;
+ strlist_t sl;
+
+ from = from_buffer = get_submission_address (mbox);
+ if (!from)
+ {
+ from = opt.default_from;
+ if (!from)
+ {
+ log_error ("no sender address found for '%s'\n", mbox);
+ err = gpg_error (GPG_ERR_CONFIGURATION);
+ goto leave;
+ }
+ log_info ("Note: using default sender address '%s'\n", from);
+ }
+
+ body = es_fopenmem (0, "w+b");
+ if (!body)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
+ goto leave;
+ }
+ /* It is fine to use 8 bit encoding because that is encrypted and
+ * only our client will see it. */
+ es_fputs ("Content-Type: text/plain; charset=utf-8\n"
+ "Content-Transfer-Encoding: 8bit\n"
+ "\n",
+ body);
+
+ es_fprintf (body,
+ "Hello!\n\n"
+ "The key for your address '%s' has been published\n"
+ "and can now be retrieved from the Web Key Directory.\n"
+ "\n"
+ "For more information on this system see:\n"
+ "\n"
+ " https://gnupg.org/faq/wkd.html\n"
+ "\n"
+ "Best regards\n"
+ "\n"
+ " Gnu Key Publisher\n\n\n"
+ "-- \n"
+ "The GnuPG Project welcomes donations: %s\n",
+ mbox, "https://gnupg.org/donate");
+
+ es_rewind (body);
+ err = encrypt_stream (&bodyenc, body, keyfile);
+ 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", from);
+ if (err)
+ goto leave;
+ err = mime_maker_add_header (mime, "To", mbox);
+ if (err)
+ goto leave;
+ err = mime_maker_add_header (mime, "Subject", "Your key has been published");
+ if (err)
+ goto leave;
+ err = mime_maker_add_header (mime, "Wks-Draft-Version",
+ STR2(WKS_DRAFT_VERSION));
+ if (err)
+ goto leave;
+ err = mime_maker_add_header (mime, "WKS-Phase", "done");
+ if (err)
+ goto leave;
+ for (sl = opt.extra_headers; sl; sl = sl->next)
+ {
+ err = mime_maker_add_header (mime, sl->d, NULL);
+ 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, &bodyenc);
+ if (err)
+ goto leave;
+
+ err = wks_send_mime (mime);
+
+ leave:
+ mime_maker_release (mime);
+ es_fclose (bodyenc);
+ es_fclose (body);
+ xfree (from_buffer);
+ return err;
+}
+
+
+/* Check that we have send a request with NONCE and publish the key. */
+static gpg_error_t
+check_and_publish (server_ctx_t ctx, const char *address, const char *nonce)
+{
+ gpg_error_t err;
+ char *fname = NULL;
+ char *fnewname = NULL;
+ estream_t key = NULL;
+ char *hash = NULL;
+ char *pendingname = NULL;
+ const char *domain;
+ const char *s;
+ uidinfo_list_t sl;
+ char shaxbuf[32]; /* Used for SHA-1 and SHA-256 */
+
+ /* FIXME: There is a bug in name-value.c which adds white space for
+ * the last pair and thus we strip the nonce here until this has
+ * been fixed. */
+ char *nonce2 = xstrdup (nonce);
+ trim_trailing_spaces (nonce2);
+ nonce = nonce2;
+
+
+ domain = strchr (address, '@');
+ log_assert (domain && domain[1]);
+ domain++;
+ if (strchr (domain, '/') || strchr (domain, '\\')
+ || strchr (nonce, '/') || strchr (nonce, '\\'))
+ {
+ log_info ("invalid domain or nonce received ('%s', '%s')\n",
+ domain, nonce);
+ err = gpg_error (GPG_ERR_NOT_FOUND);
+ goto leave;
+ }
+
+ err = make_pending_fname (nonce, address, &pendingname);
+ if (err)
+ goto leave;
+
+ fname = make_filename_try (opt.directory, domain, "pending", pendingname,
+ NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ /* Try to open the file with the key. */
+ key = es_fopen (fname, "rb");
+ if (!key)
+ {
+ err = gpg_error_from_syserror ();
+ if (gpg_err_code (err) == GPG_ERR_ENOENT)
+ {
+ log_info ("no pending request for '%s'\n", address);
+ err = gpg_error (GPG_ERR_NOT_FOUND);
+ }
+ else
+ log_error ("error reading '%s': %s\n", fname, gpg_strerror (err));
+ goto leave;
+ }
+
+ /* We need to get the fingerprint from the key. */
+ xfree (ctx->fpr);
+ free_uidinfo_list (ctx->mboxes);
+ err = wks_list_key (key, &ctx->fpr, &ctx->mboxes);
+ if (err)
+ goto leave;
+ log_assert (ctx->fpr);
+ log_info ("fingerprint: %s\n", ctx->fpr);
+ for (sl = ctx->mboxes; sl; sl = sl->next)
+ if (sl->mbox)
+ log_info (" addr-spec: %s\n", sl->mbox);
+
+ /* Check that the key has 'address' as a user id. We use
+ * case-insensitive matching because the client is expected to
+ * return the address verbatim. */
+ for (sl = ctx->mboxes; sl; sl = sl->next)
+ if (sl->mbox && !strcmp (sl->mbox, address))
+ break;
+ if (!sl)
+ {
+ log_error ("error publishing key: '%s' is not a user ID of %s\n",
+ address, ctx->fpr);
+ err = gpg_error (GPG_ERR_NO_PUBKEY);
+ goto leave;
+ }
+
+ /* Hash user ID and create filename. */
+ err = wks_compute_hu_fname (&fnewname, address);
+ if (err)
+ goto leave;
+
+ /* Publish. */
+ err = copy_key_as_binary (fname, fnewname, address);
+ if (err)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("copying '%s' to '%s' failed: %s\n",
+ fname, fnewname, gpg_strerror (err));
+ goto leave;
+ }
+
+ /* Make sure it is world readable. */
+ if (gnupg_chmod (fnewname, "-rw-r--r--"))
+ log_error ("can't set permissions of '%s': %s\n",
+ fnewname, gpg_strerror (gpg_err_code_from_syserror()));
+
+ log_info ("key %s published for '%s'\n", ctx->fpr, address);
+ send_congratulation_message (address, fnewname);
+
+ /* Try to publish as DANE record if the DANE directory exists. */
+ xfree (fname);
+ fname = fnewname;
+ fnewname = make_filename_try (opt.directory, domain, "dane", NULL);
+ if (!fnewname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if (!gnupg_access (fnewname, W_OK))
+ {
+ /* Yes, we have a dane directory. */
+ s = strchr (address, '@');
+ log_assert (s);
+ gcry_md_hash_buffer (GCRY_MD_SHA256, shaxbuf, address, s - address);
+ xfree (hash);
+ hash = bin2hex (shaxbuf, 28, NULL);
+ if (!hash)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ xfree (fnewname);
+ fnewname = make_filename_try (opt.directory, domain, "dane", hash, NULL);
+ if (!fnewname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ err = copy_key_as_dane (fname, fnewname);
+ if (err)
+ goto leave;
+ log_info ("key %s published for '%s' (DANE record)\n", ctx->fpr, address);
+ }
+
+ leave:
+ es_fclose (key);
+ xfree (hash);
+ xfree (fnewname);
+ xfree (fname);
+ xfree (nonce2);
+ xfree (pendingname);
+ return err;
+}
+
+
+/* Process a confirmation response in MSG. */
+static gpg_error_t
+process_confirmation_response (server_ctx_t ctx, estream_t msg)
+{
+ gpg_error_t err;
+ nvc_t nvc;
+ nve_t item;
+ const char *value, *sender, *address, *nonce;
+
+ err = nvc_parse (&nvc, NULL, msg);
+ if (err)
+ {
+ log_error ("parsing the WKS message failed: %s\n", gpg_strerror (err));
+ goto leave;
+ }
+
+ if (opt.debug)
+ {
+ log_debug ("response follows:\n");
+ nvc_write (nvc, log_get_stream ());
+ }
+
+ /* Check that this is a confirmation response. */
+ if (!((item = nvc_lookup (nvc, "type:")) && (value = nve_value (item))
+ && !strcmp (value, "confirmation-response")))
+ {
+ 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 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;
+ (void)sender;
+ /* FIXME: Do we really need the sender?. */
+
+ /* 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;
+
+ /* 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;
+
+ err = check_and_publish (ctx, address, nonce);
+
+
+ leave:
+ nvc_release (nvc);
+ 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;
+ struct server_ctx_s ctx;
+
+ (void)opaque;
+
+ memset (&ctx, 0, sizeof ctx);
+ if ((flags & WKS_RECEIVE_DRAFT2))
+ ctx.draft_version_2 = 1;
+
+ if (!strcmp (mediatype, "application/pgp-keys"))
+ err = process_new_key (&ctx, msg);
+ else if (!strcmp (mediatype, "application/vnd.gnupg.wks"))
+ err = process_confirmation_response (&ctx, msg);
+ else
+ {
+ log_info ("ignoring unexpected message of type '%s'\n", mediatype);
+ err = gpg_error (GPG_ERR_UNEXPECTED_MSG);
+ }
+
+ xfree (ctx.fpr);
+ free_uidinfo_list (ctx.mboxes);
+
+ return err;
+}
+
+
+
+/* Return a list of all configured domains. Each list element is the
+ * top directory for the domain. To figure out the actual domain
+ * name strrchr(name, '/') can be used. */
+static gpg_error_t
+get_domain_list (strlist_t *r_list)
+{
+ gpg_error_t err;
+ gnupg_dir_t dir = NULL;
+ char *fname = NULL;
+ gnupg_dirent_t dentry;
+ struct stat sb;
+ strlist_t list = NULL;
+
+ *r_list = NULL;
+
+ dir = gnupg_opendir (opt.directory);
+ if (!dir)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ while ((dentry = gnupg_readdir (dir)))
+ {
+ if (*dentry->d_name == '.')
+ continue;
+ if (!strchr (dentry->d_name, '.'))
+ continue; /* No dot - can't be a domain subdir. */
+
+ xfree (fname);
+ fname = make_filename_try (opt.directory, dentry->d_name, NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("make_filename failed in %s: %s\n",
+ __func__, gpg_strerror (err));
+ goto leave;
+ }
+
+ if (gnupg_stat (fname, &sb))
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error accessing '%s': %s\n", fname, gpg_strerror (err));
+ continue;
+ }
+ if (!S_ISDIR(sb.st_mode))
+ continue;
+
+ if (!add_to_strlist_try (&list, fname))
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("add_to_strlist failed in %s: %s\n",
+ __func__, gpg_strerror (err));
+ goto leave;
+ }
+ }
+ err = 0;
+ *r_list = list;
+ list = NULL;
+
+ leave:
+ free_strlist (list);
+ gnupg_closedir (dir);
+ xfree (fname);
+ return err;
+}
+
+
+
+static gpg_error_t
+expire_one_domain (const char *top_dirname, const char *domain)
+{
+ gpg_error_t err;
+ char *dirname;
+ char *fname = NULL;
+ gnupg_dir_t dir = NULL;
+ gnupg_dirent_t dentry;
+ struct stat sb;
+ time_t now = gnupg_get_time ();
+
+ dirname = make_filename_try (top_dirname, "pending", NULL);
+ if (!dirname)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("make_filename failed in %s: %s\n",
+ __func__, gpg_strerror (err));
+ goto leave;
+ }
+
+ dir = gnupg_opendir (dirname);
+ if (!dir)
+ {
+ err = gpg_error_from_syserror ();
+ log_error (("can't access directory '%s': %s\n"),
+ dirname, gpg_strerror (err));
+ goto leave;
+ }
+
+ while ((dentry = gnupg_readdir (dir)))
+ {
+ if (*dentry->d_name == '.')
+ continue;
+ xfree (fname);
+ fname = make_filename_try (dirname, dentry->d_name, NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("make_filename failed in %s: %s\n",
+ __func__, gpg_strerror (err));
+ goto leave;
+ }
+ /* The old files are 32 bytes, those created since 2.3.8 are 65 bytes. */
+ if (strlen (dentry->d_name) != 32 && strlen (dentry->d_name) != 65)
+ {
+ log_info ("garbage file '%s' ignored\n", fname);
+ continue;
+ }
+ if (gnupg_stat (fname, &sb))
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("error accessing '%s': %s\n", fname, gpg_strerror (err));
+ continue;
+ }
+ if (S_ISDIR(sb.st_mode))
+ {
+ log_info ("garbage directory '%s' ignored\n", fname);
+ continue;
+ }
+ if (sb.st_mtime + PENDING_TTL < now)
+ {
+ if (opt.verbose)
+ log_info ("domain %s: removing pending key '%s'\n",
+ domain, dentry->d_name);
+ if (remove (fname))
+ {
+ err = gpg_error_from_syserror ();
+ /* In case the file has just been renamed or another
+ * processes is cleaning up, we don't print a diagnostic
+ * for ENOENT. */
+ if (gpg_err_code (err) != GPG_ERR_ENOENT)
+ log_error ("error removing '%s': %s\n",
+ fname, gpg_strerror (err));
+ }
+ }
+ }
+ err = 0;
+
+ leave:
+ gnupg_closedir (dir);
+ xfree (dirname);
+ xfree (fname);
+ return err;
+
+}
+
+
+/* Scan spool directories and expire too old pending keys. */
+static gpg_error_t
+expire_pending_confirmations (strlist_t domaindirs)
+{
+ gpg_error_t err = 0;
+ strlist_t sl;
+ const char *domain;
+
+ for (sl = domaindirs; sl; sl = sl->next)
+ {
+ domain = strrchr (sl->d, '/');
+ log_assert (domain);
+ domain++;
+
+ expire_one_domain (sl->d, domain);
+ }
+
+ return err;
+}
+
+
+/* List all configured domains. */
+static gpg_error_t
+command_list_domains (void)
+{
+ static struct {
+ const char *name;
+ const char *perm;
+ } requireddirs[] = {
+ { "pending", "-rwx" },
+ { "hu", "-rwxr-xr-x" }
+ };
+ gpg_err_code_t ec;
+ gpg_error_t err;
+ strlist_t domaindirs;
+ strlist_t sl;
+ const char *domain;
+ char *fname = NULL;
+ int i;
+ estream_t fp;
+
+ err = get_domain_list (&domaindirs);
+ if (err)
+ {
+ log_error ("error reading list of domains: %s\n", gpg_strerror (err));
+ return err;
+ }
+
+ for (sl = domaindirs; sl; sl = sl->next)
+ {
+ domain = strrchr (sl->d, '/');
+ log_assert (domain);
+ domain++;
+ if (opt_with_dir)
+ es_printf ("%s %s\n", domain, sl->d);
+ else
+ es_printf ("%s\n", domain);
+
+
+ /* Check that the required directories are there. */
+ for (i=0; i < DIM (requireddirs); i++)
+ {
+ xfree (fname);
+ fname = make_filename_try (sl->d, requireddirs[i].name, NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if ((ec = gnupg_access (fname, W_OK)))
+ {
+ err = gpg_error (ec);
+ if (gpg_err_code (err) == GPG_ERR_ENOENT)
+ {
+ if (gnupg_mkdir (fname, requireddirs[i].perm))
+ {
+ err = gpg_error_from_syserror ();
+ log_error ("domain %s: error creating subdir '%s': %s\n",
+ domain, requireddirs[i].name,
+ gpg_strerror (err));
+ }
+ else
+ log_info ("domain %s: subdir '%s' created\n",
+ domain, requireddirs[i].name);
+ }
+ else if (err)
+ log_error ("domain %s: problem with subdir '%s': %s\n",
+ domain, requireddirs[i].name, gpg_strerror (err));
+ }
+ }
+
+ /* Print a warning if the submission address is not configured. */
+ xfree (fname);
+ fname = make_filename_try (sl->d, "submission-address", NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if ((ec = gnupg_access (fname, F_OK)))
+ {
+ err = gpg_error (ec);
+ if (gpg_err_code (err) == GPG_ERR_ENOENT)
+ log_error ("domain %s: submission address not configured\n",
+ domain);
+ else
+ log_error ("domain %s: problem with '%s': %s\n",
+ domain, fname, gpg_strerror (err));
+ }
+
+ /* Check the syntax of the optional policy file. */
+ xfree (fname);
+ fname = make_filename_try (sl->d, "policy", NULL);
+ if (!fname)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ fp = es_fopen (fname, "r");
+ if (!fp)
+ {
+ err = gpg_error_from_syserror ();
+ if (gpg_err_code (err) == GPG_ERR_ENOENT)
+ {
+ fp = es_fopen (fname, "w");
+ if (!fp)
+ log_error ("domain %s: can't create policy file: %s\n",
+ domain, gpg_strerror (err));
+ else
+ es_fclose (fp);
+ fp = NULL;
+ }
+ else
+ log_error ("domain %s: error in policy file: %s\n",
+ domain, gpg_strerror (err));
+ }
+ else
+ {
+ struct policy_flags_s policy;
+ err = wks_parse_policy (&policy, fp, 0);
+ es_fclose (fp);
+ wks_free_policy (&policy);
+ }
+ }
+ err = 0;
+
+ leave:
+ xfree (fname);
+ free_strlist (domaindirs);
+ return err;
+}
+
+
+/* Run regular maintenance jobs. */
+static gpg_error_t
+command_cron (void)
+{
+ gpg_error_t err;
+ strlist_t domaindirs;
+
+ err = get_domain_list (&domaindirs);
+ if (err)
+ {
+ log_error ("error reading list of domains: %s\n", gpg_strerror (err));
+ return err;
+ }
+
+ err = expire_pending_confirmations (domaindirs);
+
+ free_strlist (domaindirs);
+ return err;
+}
+
+
+/* Check whether the key with USER_ID is installed. */
+static gpg_error_t
+command_check_key (const char *userid)
+{
+ gpg_err_code_t ec;
+ gpg_error_t err;
+ char *addrspec = NULL;
+ char *fname = NULL;
+
+ err = wks_fname_from_userid (userid, 0, &fname, &addrspec);
+ if (err)
+ goto leave;
+
+ if ((ec = gnupg_access (fname, R_OK)))
+ {
+ err = gpg_error (ec);
+ if (opt_with_file)
+ es_printf ("%s n %s\n", addrspec, fname);
+ if (gpg_err_code (err) == GPG_ERR_ENOENT)
+ {
+ if (!opt.quiet)
+ log_info ("key for '%s' is NOT installed\n", addrspec);
+ log_inc_errorcount ();
+ err = 0;
+ }
+ else
+ log_error ("error stating '%s': %s\n", fname, gpg_strerror (err));
+ goto leave;
+ }
+
+ if (opt_with_file)
+ es_printf ("%s i %s\n", addrspec, fname);
+
+ if (opt.verbose)
+ log_info ("key for '%s' is installed\n", addrspec);
+ err = 0;
+
+ leave:
+ xfree (fname);
+ xfree (addrspec);
+ return err;
+}
+
+
+/* Revoke the key with mail address MAILADDR. */
+static gpg_error_t
+command_revoke_key (const char *mailaddr)
+{
+ /* Remove should be different from removing but we have not yet
+ * defined a suitable way to do this. */
+ return wks_cmd_remove_key (mailaddr);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 09:56:40 +0000