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0a4a03e531
* g10/import.c (impex_filter_getval): Add properties for key packets. * g10/export.c (export_drop_subkey): New var. (cleanup_export_globals): Release that var. (parse_and_set_export_filter): Add filter "drop-subkey". (apply_drop_subkey_filter): New. (do_export_stream): Run that filter. Signed-off-by: Werner Koch <wk@gnupg.org>
2327 lines
67 KiB
C
2327 lines
67 KiB
C
/* export.c - Export keys in the OpenPGP defined format.
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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* 2005, 2010 Free Software Foundation, Inc.
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* Copyright (C) 1998-2016 Werner Koch
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "gpg.h"
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#include "options.h"
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#include "packet.h"
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#include "status.h"
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#include "keydb.h"
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#include "util.h"
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#include "main.h"
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#include "i18n.h"
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#include "membuf.h"
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#include "host2net.h"
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#include "zb32.h"
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#include "recsel.h"
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#include "mbox-util.h"
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#include "init.h"
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#include "trustdb.h"
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#include "call-agent.h"
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/* An object to keep track of subkeys. */
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struct subkey_list_s
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{
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struct subkey_list_s *next;
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u32 kid[2];
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};
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typedef struct subkey_list_s *subkey_list_t;
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/* An object to track statistics for export operations. */
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struct export_stats_s
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{
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ulong count; /* Number of processed keys. */
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ulong secret_count; /* Number of secret keys seen. */
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ulong exported; /* Number of actual exported keys. */
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};
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/* A global variable to store the selector created from
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* --export-filter keep-uid=EXPR.
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* --export-filter drop-subkey=EXPR.
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*
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* FIXME: We should put this into the CTRL object but that requires a
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* lot more changes right now.
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*/
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static recsel_expr_t export_keep_uid;
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static recsel_expr_t export_drop_subkey;
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/* Local prototypes. */
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static int do_export (ctrl_t ctrl, strlist_t users, int secret,
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unsigned int options, export_stats_t stats);
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static int do_export_stream (ctrl_t ctrl, iobuf_t out,
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strlist_t users, int secret,
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kbnode_t *keyblock_out, unsigned int options,
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export_stats_t stats, int *any);
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static gpg_error_t print_pka_or_dane_records
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/**/ (iobuf_t out, kbnode_t keyblock, PKT_public_key *pk,
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const void *data, size_t datalen,
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int print_pka, int print_dane);
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static void
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cleanup_export_globals (void)
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{
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recsel_release (export_keep_uid);
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export_keep_uid = NULL;
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recsel_release (export_drop_subkey);
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export_drop_subkey = NULL;
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}
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/* Option parser for export options. See parse_options fro
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details. */
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int
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parse_export_options(char *str,unsigned int *options,int noisy)
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{
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struct parse_options export_opts[]=
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{
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{"export-local-sigs",EXPORT_LOCAL_SIGS,NULL,
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N_("export signatures that are marked as local-only")},
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{"export-attributes",EXPORT_ATTRIBUTES,NULL,
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N_("export attribute user IDs (generally photo IDs)")},
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{"export-sensitive-revkeys",EXPORT_SENSITIVE_REVKEYS,NULL,
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N_("export revocation keys marked as \"sensitive\"")},
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{"export-clean",EXPORT_CLEAN,NULL,
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N_("remove unusable parts from key during export")},
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{"export-minimal",EXPORT_MINIMAL|EXPORT_CLEAN,NULL,
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N_("remove as much as possible from key during export")},
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{"export-pka", EXPORT_PKA_FORMAT, NULL, NULL },
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{"export-dane", EXPORT_DANE_FORMAT, NULL, NULL },
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/* Aliases for backward compatibility */
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{"include-local-sigs",EXPORT_LOCAL_SIGS,NULL,NULL},
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{"include-attributes",EXPORT_ATTRIBUTES,NULL,NULL},
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{"include-sensitive-revkeys",EXPORT_SENSITIVE_REVKEYS,NULL,NULL},
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/* dummy */
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{"export-unusable-sigs",0,NULL,NULL},
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{"export-clean-sigs",0,NULL,NULL},
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{"export-clean-uids",0,NULL,NULL},
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{NULL,0,NULL,NULL}
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/* add tags for include revoked and disabled? */
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};
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return parse_options(str,options,export_opts,noisy);
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}
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/* Parse and set an export filter from string. STRING has the format
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* "NAME=EXPR" with NAME being the name of the filter. Spaces before
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* and after NAME are not allowed. If this function is called several
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* times all expressions for the same NAME are concatenated.
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* Supported filter names are:
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*
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* - keep-uid :: If the expression evaluates to true for a certain
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* user ID packet, that packet and all it dependencies
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* will be exported. The expression may use these
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* variables:
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*
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* - uid :: The entire user ID.
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* - mbox :: The mail box part of the user ID.
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* - primary :: Evaluate to true for the primary user ID.
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*
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* - drop-subkey :: If the expression evaluates to true for a subkey
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* packet that subkey and all it dependencies will be
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* remove from the keyblock. The expression may use these
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* variables:
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*
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* - secret :: 1 for a secret subkey, else 0.
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* - key_algo :: Public key algorithm id
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*/
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gpg_error_t
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parse_and_set_export_filter (const char *string)
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{
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gpg_error_t err;
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/* Auto register the cleanup function. */
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register_mem_cleanup_func (cleanup_export_globals);
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if (!strncmp (string, "keep-uid=", 9))
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err = recsel_parse_expr (&export_keep_uid, string+9);
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else if (!strncmp (string, "drop-subkey=", 12))
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err = recsel_parse_expr (&export_drop_subkey, string+12);
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else
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err = gpg_error (GPG_ERR_INV_NAME);
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return err;
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}
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/* Create a new export stats object initialized to zero. On error
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returns NULL and sets ERRNO. */
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export_stats_t
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export_new_stats (void)
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{
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export_stats_t stats;
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return xtrycalloc (1, sizeof *stats);
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}
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/* Release an export stats object. */
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void
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export_release_stats (export_stats_t stats)
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{
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xfree (stats);
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}
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/* Print export statistics using the status interface. */
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void
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export_print_stats (export_stats_t stats)
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{
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if (!stats)
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return;
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if (is_status_enabled ())
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{
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char buf[15*20];
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snprintf (buf, sizeof buf, "%lu %lu %lu",
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stats->count,
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stats->secret_count,
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stats->exported );
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write_status_text (STATUS_EXPORT_RES, buf);
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}
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}
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/*
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* Export public keys (to stdout or to --output FILE).
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*
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* Depending on opt.armor the output is armored. OPTIONS are defined
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* in main.h. If USERS is NULL, all keys will be exported. STATS is
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* either an export stats object for update or NULL.
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*
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* This function is the core of "gpg --export".
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*/
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int
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export_pubkeys (ctrl_t ctrl, strlist_t users, unsigned int options,
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export_stats_t stats)
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{
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return do_export (ctrl, users, 0, options, stats);
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}
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/*
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* Export secret keys (to stdout or to --output FILE).
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*
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* Depending on opt.armor the output is armored. If USERS is NULL,
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* all secret keys will be exported. STATS is either an export stats
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* object for update or NULL.
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*
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* This function is the core of "gpg --export-secret-keys".
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*/
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int
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export_seckeys (ctrl_t ctrl, strlist_t users, export_stats_t stats)
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{
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return do_export (ctrl, users, 1, 0, stats);
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}
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/*
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* Export secret sub keys (to stdout or to --output FILE).
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*
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* This is the same as export_seckeys but replaces the primary key by
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* a stub key. Depending on opt.armor the output is armored. If
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* USERS is NULL, all secret subkeys will be exported. STATS is
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* either an export stats object for update or NULL.
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*
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* This function is the core of "gpg --export-secret-subkeys".
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*/
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int
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export_secsubkeys (ctrl_t ctrl, strlist_t users, export_stats_t stats)
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{
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return do_export (ctrl, users, 2, 0, stats);
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}
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/*
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* Export a single key into a memory buffer. STATS is either an
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* export stats object for update or NULL.
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*/
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gpg_error_t
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export_pubkey_buffer (ctrl_t ctrl, const char *keyspec, unsigned int options,
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export_stats_t stats,
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kbnode_t *r_keyblock, void **r_data, size_t *r_datalen)
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{
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gpg_error_t err;
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iobuf_t iobuf;
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int any;
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strlist_t helplist;
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*r_keyblock = NULL;
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*r_data = NULL;
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*r_datalen = 0;
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helplist = NULL;
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if (!add_to_strlist_try (&helplist, keyspec))
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return gpg_error_from_syserror ();
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iobuf = iobuf_temp ();
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err = do_export_stream (ctrl, iobuf, helplist, 0, r_keyblock, options,
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stats, &any);
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if (!err && !any)
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err = gpg_error (GPG_ERR_NOT_FOUND);
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if (!err)
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{
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const void *src;
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size_t datalen;
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iobuf_flush_temp (iobuf);
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src = iobuf_get_temp_buffer (iobuf);
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datalen = iobuf_get_temp_length (iobuf);
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if (!datalen)
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err = gpg_error (GPG_ERR_NO_PUBKEY);
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else if (!(*r_data = xtrymalloc (datalen)))
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err = gpg_error_from_syserror ();
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else
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{
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memcpy (*r_data, src, datalen);
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*r_datalen = datalen;
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}
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}
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iobuf_close (iobuf);
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free_strlist (helplist);
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if (err && *r_keyblock)
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{
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release_kbnode (*r_keyblock);
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*r_keyblock = NULL;
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}
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return err;
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}
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/* Export the keys identified by the list of strings in USERS. If
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Secret is false public keys will be exported. With secret true
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secret keys will be exported; in this case 1 means the entire
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secret keyblock and 2 only the subkeys. OPTIONS are the export
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options to apply. */
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static int
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do_export (ctrl_t ctrl, strlist_t users, int secret, unsigned int options,
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export_stats_t stats)
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{
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IOBUF out = NULL;
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int any, rc;
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armor_filter_context_t *afx = NULL;
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compress_filter_context_t zfx;
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memset( &zfx, 0, sizeof zfx);
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rc = open_outfile (-1, NULL, 0, !!secret, &out );
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if (rc)
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return rc;
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if ( opt.armor && !(options & (EXPORT_PKA_FORMAT|EXPORT_DANE_FORMAT)) )
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{
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afx = new_armor_context ();
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afx->what = secret? 5 : 1;
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push_armor_filter (afx, out);
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}
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rc = do_export_stream (ctrl, out, users, secret, NULL, options, stats, &any);
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if ( rc || !any )
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iobuf_cancel (out);
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else
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iobuf_close (out);
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release_armor_context (afx);
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return rc;
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}
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/* Release an entire subkey list. */
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static void
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release_subkey_list (subkey_list_t list)
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{
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while (list)
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{
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subkey_list_t tmp = list->next;;
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xfree (list);
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list = tmp;
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}
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}
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/* Returns true if NODE is a subkey and contained in LIST. */
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static int
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subkey_in_list_p (subkey_list_t list, KBNODE node)
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{
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if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY
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|| node->pkt->pkttype == PKT_SECRET_SUBKEY )
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{
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u32 kid[2];
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keyid_from_pk (node->pkt->pkt.public_key, kid);
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for (; list; list = list->next)
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if (list->kid[0] == kid[0] && list->kid[1] == kid[1])
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return 1;
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}
|
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return 0;
|
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}
|
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|
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/* Allocate a new subkey list item from NODE. */
|
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static subkey_list_t
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new_subkey_list_item (KBNODE node)
|
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{
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subkey_list_t list = xcalloc (1, sizeof *list);
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if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY
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|| node->pkt->pkttype == PKT_SECRET_SUBKEY)
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keyid_from_pk (node->pkt->pkt.public_key, list->kid);
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return list;
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}
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|
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/* Helper function to check whether the subkey at NODE actually
|
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matches the description at DESC. The function returns true if the
|
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key under question has been specified by an exact specification
|
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(keyID or fingerprint) and does match the one at NODE. It is
|
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assumed that the packet at NODE is either a public or secret
|
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subkey. */
|
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static int
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exact_subkey_match_p (KEYDB_SEARCH_DESC *desc, KBNODE node)
|
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{
|
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u32 kid[2];
|
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byte fpr[MAX_FINGERPRINT_LEN];
|
||
size_t fprlen;
|
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int result = 0;
|
||
|
||
switch(desc->mode)
|
||
{
|
||
case KEYDB_SEARCH_MODE_SHORT_KID:
|
||
case KEYDB_SEARCH_MODE_LONG_KID:
|
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keyid_from_pk (node->pkt->pkt.public_key, kid);
|
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break;
|
||
|
||
case KEYDB_SEARCH_MODE_FPR16:
|
||
case KEYDB_SEARCH_MODE_FPR20:
|
||
case KEYDB_SEARCH_MODE_FPR:
|
||
fingerprint_from_pk (node->pkt->pkt.public_key, fpr,&fprlen);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
switch(desc->mode)
|
||
{
|
||
case KEYDB_SEARCH_MODE_SHORT_KID:
|
||
if (desc->u.kid[1] == kid[1])
|
||
result = 1;
|
||
break;
|
||
|
||
case KEYDB_SEARCH_MODE_LONG_KID:
|
||
if (desc->u.kid[0] == kid[0] && desc->u.kid[1] == kid[1])
|
||
result = 1;
|
||
break;
|
||
|
||
case KEYDB_SEARCH_MODE_FPR16:
|
||
if (!memcmp (desc->u.fpr, fpr, 16))
|
||
result = 1;
|
||
break;
|
||
|
||
case KEYDB_SEARCH_MODE_FPR20:
|
||
case KEYDB_SEARCH_MODE_FPR:
|
||
if (!memcmp (desc->u.fpr, fpr, 20))
|
||
result = 1;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
/* Return an error if the key represented by the S-expression S_KEY
|
||
* and the OpenPGP key represented by PK do not use the same curve. */
|
||
static gpg_error_t
|
||
match_curve_skey_pk (gcry_sexp_t s_key, PKT_public_key *pk)
|
||
{
|
||
gcry_sexp_t curve = NULL;
|
||
gcry_sexp_t flags = NULL;
|
||
char *curve_str = NULL;
|
||
char *flag;
|
||
const char *oidstr = NULL;
|
||
gcry_mpi_t curve_as_mpi = NULL;
|
||
gpg_error_t err;
|
||
int is_eddsa = 0;
|
||
int idx = 0;
|
||
|
||
if (!(pk->pubkey_algo==PUBKEY_ALGO_ECDH
|
||
|| pk->pubkey_algo==PUBKEY_ALGO_ECDSA
|
||
|| pk->pubkey_algo==PUBKEY_ALGO_EDDSA))
|
||
return gpg_error (GPG_ERR_PUBKEY_ALGO);
|
||
|
||
curve = gcry_sexp_find_token (s_key, "curve", 0);
|
||
if (!curve)
|
||
{
|
||
log_error ("no reported curve\n");
|
||
return gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
}
|
||
curve_str = gcry_sexp_nth_string (curve, 1);
|
||
gcry_sexp_release (curve); curve = NULL;
|
||
if (!curve_str)
|
||
{
|
||
log_error ("no curve name\n");
|
||
return gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
}
|
||
oidstr = openpgp_curve_to_oid (curve_str, NULL);
|
||
if (!oidstr)
|
||
{
|
||
log_error ("no OID known for curve '%s'\n", curve_str);
|
||
xfree (curve_str);
|
||
return gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
}
|
||
xfree (curve_str);
|
||
err = openpgp_oid_from_str (oidstr, &curve_as_mpi);
|
||
if (err)
|
||
return err;
|
||
if (gcry_mpi_cmp (pk->pkey[0], curve_as_mpi))
|
||
{
|
||
log_error ("curves do not match\n");
|
||
gcry_mpi_release (curve_as_mpi);
|
||
return gpg_error (GPG_ERR_INV_CURVE);
|
||
}
|
||
gcry_mpi_release (curve_as_mpi);
|
||
flags = gcry_sexp_find_token (s_key, "flags", 0);
|
||
if (flags)
|
||
{
|
||
for (idx = 1; idx < gcry_sexp_length (flags); idx++)
|
||
{
|
||
flag = gcry_sexp_nth_string (flags, idx);
|
||
if (flag && (strcmp ("eddsa", flag) == 0))
|
||
is_eddsa = 1;
|
||
gcry_free (flag);
|
||
}
|
||
}
|
||
if (is_eddsa != (pk->pubkey_algo == PUBKEY_ALGO_EDDSA))
|
||
{
|
||
log_error ("disagreement about EdDSA\n");
|
||
err = gpg_error (GPG_ERR_INV_CURVE);
|
||
}
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Return a canonicalized public key algoithms. This is used to
|
||
compare different flavors of algorithms (e.g. ELG and ELG_E are
|
||
considered the same). */
|
||
static enum gcry_pk_algos
|
||
canon_pk_algo (enum gcry_pk_algos algo)
|
||
{
|
||
switch (algo)
|
||
{
|
||
case GCRY_PK_RSA:
|
||
case GCRY_PK_RSA_E:
|
||
case GCRY_PK_RSA_S: return GCRY_PK_RSA;
|
||
case GCRY_PK_ELG:
|
||
case GCRY_PK_ELG_E: return GCRY_PK_ELG;
|
||
case GCRY_PK_ECC:
|
||
case GCRY_PK_ECDSA:
|
||
case GCRY_PK_ECDH: return GCRY_PK_ECC;
|
||
default: return algo;
|
||
}
|
||
}
|
||
|
||
|
||
/* Take a cleartext dump of a secret key in PK and change the
|
||
* parameter array in PK to include the secret parameters. */
|
||
static gpg_error_t
|
||
cleartext_secret_key_to_openpgp (gcry_sexp_t s_key, PKT_public_key *pk)
|
||
{
|
||
gpg_error_t err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
|
||
gcry_sexp_t top_list;
|
||
gcry_sexp_t key = NULL;
|
||
char *key_type = NULL;
|
||
enum gcry_pk_algos pk_algo;
|
||
struct seckey_info *ski;
|
||
int idx, sec_start;
|
||
gcry_mpi_t pub_params[10] = { NULL };
|
||
|
||
/* we look for a private-key, then the first element in it tells us
|
||
the type */
|
||
top_list = gcry_sexp_find_token (s_key, "private-key", 0);
|
||
if (!top_list)
|
||
goto bad_seckey;
|
||
if (gcry_sexp_length(top_list) != 2)
|
||
goto bad_seckey;
|
||
key = gcry_sexp_nth (top_list, 1);
|
||
if (!key)
|
||
goto bad_seckey;
|
||
key_type = gcry_sexp_nth_string(key, 0);
|
||
pk_algo = gcry_pk_map_name (key_type);
|
||
|
||
log_assert (!pk->seckey_info);
|
||
|
||
pk->seckey_info = ski = xtrycalloc (1, sizeof *ski);
|
||
if (!ski)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
switch (canon_pk_algo (pk_algo))
|
||
{
|
||
case GCRY_PK_RSA:
|
||
if (!is_RSA (pk->pubkey_algo))
|
||
goto bad_pubkey_algo;
|
||
err = gcry_sexp_extract_param (key, NULL, "ne",
|
||
&pub_params[0],
|
||
&pub_params[1],
|
||
NULL);
|
||
for (idx=0; idx < 2 && !err; idx++)
|
||
if (gcry_mpi_cmp(pk->pkey[idx], pub_params[idx]))
|
||
err = gpg_error (GPG_ERR_BAD_PUBKEY);
|
||
if (!err)
|
||
{
|
||
for (idx = 2; idx < 6 && !err; idx++)
|
||
{
|
||
gcry_mpi_release (pk->pkey[idx]);
|
||
pk->pkey[idx] = NULL;
|
||
}
|
||
err = gcry_sexp_extract_param (key, NULL, "dpqu",
|
||
&pk->pkey[2],
|
||
&pk->pkey[3],
|
||
&pk->pkey[4],
|
||
&pk->pkey[5],
|
||
NULL);
|
||
}
|
||
if (!err)
|
||
{
|
||
for (idx = 2; idx < 6; idx++)
|
||
ski->csum += checksum_mpi (pk->pkey[idx]);
|
||
}
|
||
break;
|
||
|
||
case GCRY_PK_DSA:
|
||
if (!is_DSA (pk->pubkey_algo))
|
||
goto bad_pubkey_algo;
|
||
err = gcry_sexp_extract_param (key, NULL, "pqgy",
|
||
&pub_params[0],
|
||
&pub_params[1],
|
||
&pub_params[2],
|
||
&pub_params[3],
|
||
NULL);
|
||
for (idx=0; idx < 4 && !err; idx++)
|
||
if (gcry_mpi_cmp(pk->pkey[idx], pub_params[idx]))
|
||
err = gpg_error (GPG_ERR_BAD_PUBKEY);
|
||
if (!err)
|
||
{
|
||
gcry_mpi_release (pk->pkey[4]);
|
||
pk->pkey[4] = NULL;
|
||
err = gcry_sexp_extract_param (key, NULL, "x",
|
||
&pk->pkey[4],
|
||
NULL);
|
||
}
|
||
if (!err)
|
||
ski->csum += checksum_mpi (pk->pkey[4]);
|
||
break;
|
||
|
||
case GCRY_PK_ELG:
|
||
if (!is_ELGAMAL (pk->pubkey_algo))
|
||
goto bad_pubkey_algo;
|
||
err = gcry_sexp_extract_param (key, NULL, "pgy",
|
||
&pub_params[0],
|
||
&pub_params[1],
|
||
&pub_params[2],
|
||
NULL);
|
||
for (idx=0; idx < 3 && !err; idx++)
|
||
if (gcry_mpi_cmp(pk->pkey[idx], pub_params[idx]))
|
||
err = gpg_error (GPG_ERR_BAD_PUBKEY);
|
||
if (!err)
|
||
{
|
||
gcry_mpi_release (pk->pkey[3]);
|
||
pk->pkey[3] = NULL;
|
||
err = gcry_sexp_extract_param (key, NULL, "x",
|
||
&pk->pkey[3],
|
||
NULL);
|
||
}
|
||
if (!err)
|
||
ski->csum += checksum_mpi (pk->pkey[3]);
|
||
break;
|
||
|
||
case GCRY_PK_ECC:
|
||
err = match_curve_skey_pk (key, pk);
|
||
if (err)
|
||
goto leave;
|
||
if (!err)
|
||
err = gcry_sexp_extract_param (key, NULL, "q",
|
||
&pub_params[0],
|
||
NULL);
|
||
if (!err && (gcry_mpi_cmp(pk->pkey[1], pub_params[0])))
|
||
err = gpg_error (GPG_ERR_BAD_PUBKEY);
|
||
|
||
sec_start = 2;
|
||
if (pk->pubkey_algo == PUBKEY_ALGO_ECDH)
|
||
sec_start += 1;
|
||
if (!err)
|
||
{
|
||
gcry_mpi_release (pk->pkey[sec_start]);
|
||
pk->pkey[sec_start] = NULL;
|
||
err = gcry_sexp_extract_param (key, NULL, "d",
|
||
&pk->pkey[sec_start],
|
||
NULL);
|
||
}
|
||
|
||
if (!err)
|
||
ski->csum += checksum_mpi (pk->pkey[sec_start]);
|
||
break;
|
||
|
||
default:
|
||
pk->seckey_info = NULL;
|
||
xfree (ski);
|
||
err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
|
||
break;
|
||
}
|
||
|
||
leave:
|
||
gcry_sexp_release (top_list);
|
||
gcry_sexp_release (key);
|
||
gcry_free (key_type);
|
||
|
||
for (idx=0; idx < DIM(pub_params); idx++)
|
||
gcry_mpi_release (pub_params[idx]);
|
||
return err;
|
||
|
||
bad_pubkey_algo:
|
||
err = gpg_error (GPG_ERR_PUBKEY_ALGO);
|
||
goto leave;
|
||
|
||
bad_seckey:
|
||
err = gpg_error (GPG_ERR_BAD_SECKEY);
|
||
goto leave;
|
||
}
|
||
|
||
|
||
/* Use the key transfer format given in S_PGP to create the secinfo
|
||
structure in PK and change the parameter array in PK to include the
|
||
secret parameters. */
|
||
static gpg_error_t
|
||
transfer_format_to_openpgp (gcry_sexp_t s_pgp, PKT_public_key *pk)
|
||
{
|
||
gpg_error_t err;
|
||
gcry_sexp_t top_list;
|
||
gcry_sexp_t list = NULL;
|
||
char *curve = NULL;
|
||
const char *value;
|
||
size_t valuelen;
|
||
char *string;
|
||
int idx;
|
||
int is_v4, is_protected;
|
||
enum gcry_pk_algos pk_algo;
|
||
int protect_algo = 0;
|
||
char iv[16];
|
||
int ivlen = 0;
|
||
int s2k_mode = 0;
|
||
int s2k_algo = 0;
|
||
byte s2k_salt[8];
|
||
u32 s2k_count = 0;
|
||
int is_ecdh = 0;
|
||
size_t npkey, nskey;
|
||
gcry_mpi_t skey[10]; /* We support up to 9 parameters. */
|
||
int skeyidx = 0;
|
||
struct seckey_info *ski;
|
||
|
||
/* gcry_log_debugsxp ("transferkey", s_pgp); */
|
||
top_list = gcry_sexp_find_token (s_pgp, "openpgp-private-key", 0);
|
||
if (!top_list)
|
||
goto bad_seckey;
|
||
|
||
list = gcry_sexp_find_token (top_list, "version", 0);
|
||
if (!list)
|
||
goto bad_seckey;
|
||
value = gcry_sexp_nth_data (list, 1, &valuelen);
|
||
if (!value || valuelen != 1 || !(value[0] == '3' || value[0] == '4'))
|
||
goto bad_seckey;
|
||
is_v4 = (value[0] == '4');
|
||
|
||
gcry_sexp_release (list);
|
||
list = gcry_sexp_find_token (top_list, "protection", 0);
|
||
if (!list)
|
||
goto bad_seckey;
|
||
value = gcry_sexp_nth_data (list, 1, &valuelen);
|
||
if (!value)
|
||
goto bad_seckey;
|
||
if (valuelen == 4 && !memcmp (value, "sha1", 4))
|
||
is_protected = 2;
|
||
else if (valuelen == 3 && !memcmp (value, "sum", 3))
|
||
is_protected = 1;
|
||
else if (valuelen == 4 && !memcmp (value, "none", 4))
|
||
is_protected = 0;
|
||
else
|
||
goto bad_seckey;
|
||
if (is_protected)
|
||
{
|
||
string = gcry_sexp_nth_string (list, 2);
|
||
if (!string)
|
||
goto bad_seckey;
|
||
protect_algo = gcry_cipher_map_name (string);
|
||
xfree (string);
|
||
|
||
value = gcry_sexp_nth_data (list, 3, &valuelen);
|
||
if (!value || !valuelen || valuelen > sizeof iv)
|
||
goto bad_seckey;
|
||
memcpy (iv, value, valuelen);
|
||
ivlen = valuelen;
|
||
|
||
string = gcry_sexp_nth_string (list, 4);
|
||
if (!string)
|
||
goto bad_seckey;
|
||
s2k_mode = strtol (string, NULL, 10);
|
||
xfree (string);
|
||
|
||
string = gcry_sexp_nth_string (list, 5);
|
||
if (!string)
|
||
goto bad_seckey;
|
||
s2k_algo = gcry_md_map_name (string);
|
||
xfree (string);
|
||
|
||
value = gcry_sexp_nth_data (list, 6, &valuelen);
|
||
if (!value || !valuelen || valuelen > sizeof s2k_salt)
|
||
goto bad_seckey;
|
||
memcpy (s2k_salt, value, valuelen);
|
||
|
||
string = gcry_sexp_nth_string (list, 7);
|
||
if (!string)
|
||
goto bad_seckey;
|
||
s2k_count = strtoul (string, NULL, 10);
|
||
xfree (string);
|
||
}
|
||
|
||
/* Parse the gcrypt PK algo and check that it is okay. */
|
||
gcry_sexp_release (list);
|
||
list = gcry_sexp_find_token (top_list, "algo", 0);
|
||
if (!list)
|
||
goto bad_seckey;
|
||
string = gcry_sexp_nth_string (list, 1);
|
||
if (!string)
|
||
goto bad_seckey;
|
||
pk_algo = gcry_pk_map_name (string);
|
||
xfree (string); string = NULL;
|
||
if (gcry_pk_algo_info (pk_algo, GCRYCTL_GET_ALGO_NPKEY, NULL, &npkey)
|
||
|| gcry_pk_algo_info (pk_algo, GCRYCTL_GET_ALGO_NSKEY, NULL, &nskey)
|
||
|| !npkey || npkey >= nskey)
|
||
goto bad_seckey;
|
||
|
||
/* Check that the pubkey algo matches the one from the public key. */
|
||
switch (canon_pk_algo (pk_algo))
|
||
{
|
||
case GCRY_PK_RSA:
|
||
if (!is_RSA (pk->pubkey_algo))
|
||
pk_algo = 0; /* Does not match. */
|
||
break;
|
||
case GCRY_PK_DSA:
|
||
if (!is_DSA (pk->pubkey_algo))
|
||
pk_algo = 0; /* Does not match. */
|
||
break;
|
||
case GCRY_PK_ELG:
|
||
if (!is_ELGAMAL (pk->pubkey_algo))
|
||
pk_algo = 0; /* Does not match. */
|
||
break;
|
||
case GCRY_PK_ECC:
|
||
if (pk->pubkey_algo == PUBKEY_ALGO_ECDSA)
|
||
;
|
||
else if (pk->pubkey_algo == PUBKEY_ALGO_ECDH)
|
||
is_ecdh = 1;
|
||
else if (pk->pubkey_algo == PUBKEY_ALGO_EDDSA)
|
||
;
|
||
else
|
||
pk_algo = 0; /* Does not match. */
|
||
/* For ECC we do not have the domain parameters thus fix our info. */
|
||
npkey = 1;
|
||
nskey = 2;
|
||
break;
|
||
default:
|
||
pk_algo = 0; /* Oops. */
|
||
break;
|
||
}
|
||
if (!pk_algo)
|
||
{
|
||
err = gpg_error (GPG_ERR_PUBKEY_ALGO);
|
||
goto leave;
|
||
}
|
||
|
||
/* This check has to go after the ecc adjustments. */
|
||
if (nskey > PUBKEY_MAX_NSKEY)
|
||
goto bad_seckey;
|
||
|
||
/* Parse the key parameters. */
|
||
gcry_sexp_release (list);
|
||
list = gcry_sexp_find_token (top_list, "skey", 0);
|
||
if (!list)
|
||
goto bad_seckey;
|
||
for (idx=0;;)
|
||
{
|
||
int is_enc;
|
||
|
||
value = gcry_sexp_nth_data (list, ++idx, &valuelen);
|
||
if (!value && skeyidx >= npkey)
|
||
break; /* Ready. */
|
||
|
||
/* Check for too many parameters. Note that depending on the
|
||
protection mode and version number we may see less than NSKEY
|
||
(but at least NPKEY+1) parameters. */
|
||
if (idx >= 2*nskey)
|
||
goto bad_seckey;
|
||
if (skeyidx >= DIM (skey)-1)
|
||
goto bad_seckey;
|
||
|
||
if (!value || valuelen != 1 || !(value[0] == '_' || value[0] == 'e'))
|
||
goto bad_seckey;
|
||
is_enc = (value[0] == 'e');
|
||
value = gcry_sexp_nth_data (list, ++idx, &valuelen);
|
||
if (!value || !valuelen)
|
||
goto bad_seckey;
|
||
if (is_enc)
|
||
{
|
||
void *p = xtrymalloc (valuelen);
|
||
if (!p)
|
||
goto outofmem;
|
||
memcpy (p, value, valuelen);
|
||
skey[skeyidx] = gcry_mpi_set_opaque (NULL, p, valuelen*8);
|
||
if (!skey[skeyidx])
|
||
goto outofmem;
|
||
}
|
||
else
|
||
{
|
||
if (gcry_mpi_scan (skey + skeyidx, GCRYMPI_FMT_STD,
|
||
value, valuelen, NULL))
|
||
goto bad_seckey;
|
||
}
|
||
skeyidx++;
|
||
}
|
||
skey[skeyidx++] = NULL;
|
||
|
||
gcry_sexp_release (list); list = NULL;
|
||
|
||
/* We have no need for the CSUM value thus we don't parse it. */
|
||
/* list = gcry_sexp_find_token (top_list, "csum", 0); */
|
||
/* if (list) */
|
||
/* { */
|
||
/* string = gcry_sexp_nth_string (list, 1); */
|
||
/* if (!string) */
|
||
/* goto bad_seckey; */
|
||
/* desired_csum = strtoul (string, NULL, 10); */
|
||
/* xfree (string); */
|
||
/* } */
|
||
/* else */
|
||
/* desired_csum = 0; */
|
||
/* gcry_sexp_release (list); list = NULL; */
|
||
|
||
/* Get the curve name if any, */
|
||
list = gcry_sexp_find_token (top_list, "curve", 0);
|
||
if (list)
|
||
{
|
||
curve = gcry_sexp_nth_string (list, 1);
|
||
gcry_sexp_release (list); list = NULL;
|
||
}
|
||
|
||
gcry_sexp_release (top_list); top_list = NULL;
|
||
|
||
/* log_debug ("XXX is_v4=%d\n", is_v4); */
|
||
/* log_debug ("XXX pubkey_algo=%d\n", pubkey_algo); */
|
||
/* log_debug ("XXX is_protected=%d\n", is_protected); */
|
||
/* log_debug ("XXX protect_algo=%d\n", protect_algo); */
|
||
/* log_printhex ("XXX iv", iv, ivlen); */
|
||
/* log_debug ("XXX ivlen=%d\n", ivlen); */
|
||
/* log_debug ("XXX s2k_mode=%d\n", s2k_mode); */
|
||
/* log_debug ("XXX s2k_algo=%d\n", s2k_algo); */
|
||
/* log_printhex ("XXX s2k_salt", s2k_salt, sizeof s2k_salt); */
|
||
/* log_debug ("XXX s2k_count=%lu\n", (unsigned long)s2k_count); */
|
||
/* for (idx=0; skey[idx]; idx++) */
|
||
/* { */
|
||
/* int is_enc = gcry_mpi_get_flag (skey[idx], GCRYMPI_FLAG_OPAQUE); */
|
||
/* log_info ("XXX skey[%d]%s:", idx, is_enc? " (enc)":""); */
|
||
/* if (is_enc) */
|
||
/* { */
|
||
/* void *p; */
|
||
/* unsigned int nbits; */
|
||
/* p = gcry_mpi_get_opaque (skey[idx], &nbits); */
|
||
/* log_printhex (NULL, p, (nbits+7)/8); */
|
||
/* } */
|
||
/* else */
|
||
/* gcry_mpi_dump (skey[idx]); */
|
||
/* log_printf ("\n"); */
|
||
/* } */
|
||
|
||
if (!is_v4 || is_protected != 2 )
|
||
{
|
||
/* We only support the v4 format and a SHA-1 checksum. */
|
||
err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
|
||
goto leave;
|
||
}
|
||
|
||
/* We need to change the received parameters for ECC algorithms.
|
||
The transfer format has the curve name and the parameters
|
||
separate. We put them all into the SKEY array. */
|
||
if (canon_pk_algo (pk_algo) == GCRY_PK_ECC)
|
||
{
|
||
const char *oidstr;
|
||
|
||
/* Assert that all required parameters are available. We also
|
||
check that the array does not contain more parameters than
|
||
needed (this was used by some beta versions of 2.1. */
|
||
if (!curve || !skey[0] || !skey[1] || skey[2])
|
||
{
|
||
err = gpg_error (GPG_ERR_INTERNAL);
|
||
goto leave;
|
||
}
|
||
|
||
oidstr = openpgp_curve_to_oid (curve, NULL);
|
||
if (!oidstr)
|
||
{
|
||
log_error ("no OID known for curve '%s'\n", curve);
|
||
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
goto leave;
|
||
}
|
||
/* Put the curve's OID into into the MPI array. This requires
|
||
that we shift Q and D. For ECDH also insert the KDF parms. */
|
||
if (is_ecdh)
|
||
{
|
||
skey[4] = NULL;
|
||
skey[3] = skey[1];
|
||
skey[2] = gcry_mpi_copy (pk->pkey[2]);
|
||
}
|
||
else
|
||
{
|
||
skey[3] = NULL;
|
||
skey[2] = skey[1];
|
||
}
|
||
skey[1] = skey[0];
|
||
skey[0] = NULL;
|
||
err = openpgp_oid_from_str (oidstr, skey + 0);
|
||
if (err)
|
||
goto leave;
|
||
/* Fixup the NPKEY and NSKEY to match OpenPGP reality. */
|
||
npkey = 2 + is_ecdh;
|
||
nskey = 3 + is_ecdh;
|
||
|
||
/* for (idx=0; skey[idx]; idx++) */
|
||
/* { */
|
||
/* log_info ("YYY skey[%d]:", idx); */
|
||
/* if (gcry_mpi_get_flag (skey[idx], GCRYMPI_FLAG_OPAQUE)) */
|
||
/* { */
|
||
/* void *p; */
|
||
/* unsigned int nbits; */
|
||
/* p = gcry_mpi_get_opaque (skey[idx], &nbits); */
|
||
/* log_printhex (NULL, p, (nbits+7)/8); */
|
||
/* } */
|
||
/* else */
|
||
/* gcry_mpi_dump (skey[idx]); */
|
||
/* log_printf ("\n"); */
|
||
/* } */
|
||
}
|
||
|
||
/* Do some sanity checks. */
|
||
if (s2k_count > 255)
|
||
{
|
||
/* We expect an already encoded S2K count. */
|
||
err = gpg_error (GPG_ERR_INV_DATA);
|
||
goto leave;
|
||
}
|
||
err = openpgp_cipher_test_algo (protect_algo);
|
||
if (err)
|
||
goto leave;
|
||
err = openpgp_md_test_algo (s2k_algo);
|
||
if (err)
|
||
goto leave;
|
||
|
||
/* Check that the public key parameters match. Note that since
|
||
Libgcrypt 1.5 gcry_mpi_cmp handles opaque MPI correctly. */
|
||
for (idx=0; idx < npkey; idx++)
|
||
if (gcry_mpi_cmp (pk->pkey[idx], skey[idx]))
|
||
{
|
||
err = gpg_error (GPG_ERR_BAD_PUBKEY);
|
||
goto leave;
|
||
}
|
||
|
||
/* Check that the first secret key parameter in SKEY is encrypted
|
||
and that there are no more secret key parameters. The latter is
|
||
guaranteed by the v4 packet format. */
|
||
if (!gcry_mpi_get_flag (skey[npkey], GCRYMPI_FLAG_OPAQUE))
|
||
goto bad_seckey;
|
||
if (npkey+1 < DIM (skey) && skey[npkey+1])
|
||
goto bad_seckey;
|
||
|
||
/* Check that the secret key parameters in PK are all set to NULL. */
|
||
for (idx=npkey; idx < nskey; idx++)
|
||
if (pk->pkey[idx])
|
||
goto bad_seckey;
|
||
|
||
/* Now build the protection info. */
|
||
pk->seckey_info = ski = xtrycalloc (1, sizeof *ski);
|
||
if (!ski)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
ski->is_protected = 1;
|
||
ski->sha1chk = 1;
|
||
ski->algo = protect_algo;
|
||
ski->s2k.mode = s2k_mode;
|
||
ski->s2k.hash_algo = s2k_algo;
|
||
log_assert (sizeof ski->s2k.salt == sizeof s2k_salt);
|
||
memcpy (ski->s2k.salt, s2k_salt, sizeof s2k_salt);
|
||
ski->s2k.count = s2k_count;
|
||
log_assert (ivlen <= sizeof ski->iv);
|
||
memcpy (ski->iv, iv, ivlen);
|
||
ski->ivlen = ivlen;
|
||
|
||
/* Store the protected secret key parameter. */
|
||
pk->pkey[npkey] = skey[npkey];
|
||
skey[npkey] = NULL;
|
||
|
||
/* That's it. */
|
||
|
||
leave:
|
||
gcry_free (curve);
|
||
gcry_sexp_release (list);
|
||
gcry_sexp_release (top_list);
|
||
for (idx=0; idx < skeyidx; idx++)
|
||
gcry_mpi_release (skey[idx]);
|
||
return err;
|
||
|
||
bad_seckey:
|
||
err = gpg_error (GPG_ERR_BAD_SECKEY);
|
||
goto leave;
|
||
|
||
outofmem:
|
||
err = gpg_error (GPG_ERR_ENOMEM);
|
||
goto leave;
|
||
}
|
||
|
||
|
||
/* Print an "EXPORTED" status line. PK is the primary public key. */
|
||
static void
|
||
print_status_exported (PKT_public_key *pk)
|
||
{
|
||
char *hexfpr;
|
||
|
||
if (!is_status_enabled ())
|
||
return;
|
||
|
||
hexfpr = hexfingerprint (pk, NULL, 0);
|
||
write_status_text (STATUS_EXPORTED, hexfpr? hexfpr : "[?]");
|
||
xfree (hexfpr);
|
||
}
|
||
|
||
|
||
/*
|
||
* Receive a secret key from agent specified by HEXGRIP.
|
||
*
|
||
* Since the key data from agant is encrypted, decrypt it by CIPHERHD.
|
||
* Then, parse the decrypted key data in transfer format, and put
|
||
* secret parameters into PK.
|
||
*
|
||
* If CLEARTEXT is 0, store the secret key material
|
||
* passphrase-protected. Otherwise, store secret key material in the
|
||
* clear.
|
||
*
|
||
* CACHE_NONCE_ADDR is used to share nonce for multple key retrievals.
|
||
*/
|
||
gpg_error_t
|
||
receive_seckey_from_agent (ctrl_t ctrl, gcry_cipher_hd_t cipherhd,
|
||
int cleartext,
|
||
char **cache_nonce_addr, const char *hexgrip,
|
||
PKT_public_key *pk)
|
||
{
|
||
gpg_error_t err = 0;
|
||
unsigned char *wrappedkey = NULL;
|
||
size_t wrappedkeylen;
|
||
unsigned char *key = NULL;
|
||
size_t keylen, realkeylen;
|
||
gcry_sexp_t s_skey;
|
||
char *prompt;
|
||
|
||
if (opt.verbose)
|
||
log_info ("key %s: asking agent for the secret parts\n", hexgrip);
|
||
|
||
prompt = gpg_format_keydesc (pk, FORMAT_KEYDESC_EXPORT,1);
|
||
err = agent_export_key (ctrl, hexgrip, prompt, !cleartext, cache_nonce_addr,
|
||
&wrappedkey, &wrappedkeylen);
|
||
xfree (prompt);
|
||
|
||
if (err)
|
||
goto unwraperror;
|
||
if (wrappedkeylen < 24)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_LENGTH);
|
||
goto unwraperror;
|
||
}
|
||
keylen = wrappedkeylen - 8;
|
||
key = xtrymalloc_secure (keylen);
|
||
if (!key)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto unwraperror;
|
||
}
|
||
err = gcry_cipher_decrypt (cipherhd, key, keylen, wrappedkey, wrappedkeylen);
|
||
if (err)
|
||
goto unwraperror;
|
||
realkeylen = gcry_sexp_canon_len (key, keylen, NULL, &err);
|
||
if (!realkeylen)
|
||
goto unwraperror; /* Invalid csexp. */
|
||
|
||
err = gcry_sexp_sscan (&s_skey, NULL, key, realkeylen);
|
||
if (!err)
|
||
{
|
||
if (cleartext)
|
||
err = cleartext_secret_key_to_openpgp (s_skey, pk);
|
||
else
|
||
err = transfer_format_to_openpgp (s_skey, pk);
|
||
gcry_sexp_release (s_skey);
|
||
}
|
||
|
||
unwraperror:
|
||
xfree (key);
|
||
xfree (wrappedkey);
|
||
if (err)
|
||
{
|
||
log_error ("key %s: error receiving key from agent:"
|
||
" %s%s\n", hexgrip, gpg_strerror (err),
|
||
gpg_err_code (err) == GPG_ERR_FULLY_CANCELED?
|
||
"":_(" - skipped"));
|
||
}
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Write KEYBLOCK either to stdout or to the file set with the
|
||
* --output option. This is a simplified version of do_export_stream
|
||
* which supports only a few export options. */
|
||
gpg_error_t
|
||
write_keyblock_to_output (kbnode_t keyblock, int with_armor,
|
||
unsigned int options)
|
||
{
|
||
gpg_error_t err;
|
||
const char *fname;
|
||
iobuf_t out;
|
||
kbnode_t node;
|
||
armor_filter_context_t *afx = NULL;
|
||
iobuf_t out_help = NULL;
|
||
PKT_public_key *pk = NULL;
|
||
|
||
fname = opt.outfile? opt.outfile : "-";
|
||
if (is_secured_filename (fname) )
|
||
return gpg_error (GPG_ERR_EPERM);
|
||
|
||
out = iobuf_create (fname, 0);
|
||
if (!out)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error(_("can't create '%s': %s\n"), fname, gpg_strerror (err));
|
||
return err;
|
||
}
|
||
if (opt.verbose)
|
||
log_info (_("writing to '%s'\n"), iobuf_get_fname_nonnull (out));
|
||
|
||
if ((options & (EXPORT_PKA_FORMAT|EXPORT_DANE_FORMAT)))
|
||
{
|
||
with_armor = 0;
|
||
out_help = iobuf_temp ();
|
||
}
|
||
|
||
if (with_armor)
|
||
{
|
||
afx = new_armor_context ();
|
||
afx->what = 1;
|
||
push_armor_filter (afx, out);
|
||
}
|
||
|
||
for (node = keyblock; node; node = node->next)
|
||
{
|
||
if (is_deleted_kbnode (node) || node->pkt->pkttype == PKT_RING_TRUST)
|
||
continue;
|
||
if (!pk && (node->pkt->pkttype == PKT_PUBLIC_KEY
|
||
|| node->pkt->pkttype == PKT_SECRET_KEY))
|
||
pk = node->pkt->pkt.public_key;
|
||
|
||
err = build_packet (out_help? out_help : out, node->pkt);
|
||
if (err)
|
||
{
|
||
log_error ("build_packet(%d) failed: %s\n",
|
||
node->pkt->pkttype, gpg_strerror (err) );
|
||
goto leave;
|
||
}
|
||
}
|
||
err = 0;
|
||
|
||
if (out_help && pk)
|
||
{
|
||
const void *data;
|
||
size_t datalen;
|
||
|
||
iobuf_flush_temp (out_help);
|
||
data = iobuf_get_temp_buffer (out_help);
|
||
datalen = iobuf_get_temp_length (out_help);
|
||
|
||
err = print_pka_or_dane_records (out,
|
||
keyblock, pk, data, datalen,
|
||
(options & EXPORT_PKA_FORMAT),
|
||
(options & EXPORT_DANE_FORMAT));
|
||
}
|
||
|
||
leave:
|
||
if (err)
|
||
iobuf_cancel (out);
|
||
else
|
||
iobuf_close (out);
|
||
iobuf_cancel (out_help);
|
||
release_armor_context (afx);
|
||
return err;
|
||
}
|
||
|
||
|
||
/*
|
||
* Apply the keep-uid filter to the keyblock. The deleted nodes are
|
||
* marked and thus the caller should call commit_kbnode afterwards.
|
||
* KEYBLOCK must not have any blocks marked as deleted.
|
||
*/
|
||
static void
|
||
apply_keep_uid_filter (kbnode_t keyblock, recsel_expr_t selector)
|
||
{
|
||
kbnode_t node;
|
||
|
||
for (node = keyblock->next; node; node = node->next )
|
||
{
|
||
if (node->pkt->pkttype == PKT_USER_ID)
|
||
{
|
||
if (!recsel_select (selector, impex_filter_getval, node))
|
||
{
|
||
/* log_debug ("keep-uid: deleting '%s'\n", */
|
||
/* node->pkt->pkt.user_id->name); */
|
||
/* The UID packet and all following packets up to the
|
||
* next UID or a subkey. */
|
||
delete_kbnode (node);
|
||
for (; node->next
|
||
&& node->next->pkt->pkttype != PKT_USER_ID
|
||
&& node->next->pkt->pkttype != PKT_PUBLIC_SUBKEY
|
||
&& node->next->pkt->pkttype != PKT_SECRET_SUBKEY ;
|
||
node = node->next)
|
||
delete_kbnode (node->next);
|
||
}
|
||
/* else */
|
||
/* log_debug ("keep-uid: keeping '%s'\n", */
|
||
/* node->pkt->pkt.user_id->name); */
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/*
|
||
* Apply the drop-subkey filter to the keyblock. The deleted nodes are
|
||
* marked and thus the caller should call commit_kbnode afterwards.
|
||
* KEYBLOCK must not have any blocks marked as deleted.
|
||
*/
|
||
static void
|
||
apply_drop_subkey_filter (kbnode_t keyblock, recsel_expr_t selector)
|
||
{
|
||
kbnode_t node;
|
||
|
||
for (node = keyblock->next; node; node = node->next )
|
||
{
|
||
if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY
|
||
|| node->pkt->pkttype == PKT_SECRET_SUBKEY)
|
||
{
|
||
if (recsel_select (selector, impex_filter_getval, node))
|
||
{
|
||
log_debug ("drop-subkey: deleting a key\n");
|
||
/* The subkey packet and all following packets up to the
|
||
* next subkey. */
|
||
delete_kbnode (node);
|
||
for (; node->next
|
||
&& node->next->pkt->pkttype != PKT_PUBLIC_SUBKEY
|
||
&& node->next->pkt->pkttype != PKT_SECRET_SUBKEY ;
|
||
node = node->next)
|
||
delete_kbnode (node->next);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/* Print DANE or PKA records for all user IDs in KEYBLOCK to OUT. The
|
||
* data for the record is taken from (DATA,DATELEN). PK is the public
|
||
* key packet with the primary key. */
|
||
static gpg_error_t
|
||
print_pka_or_dane_records (iobuf_t out, kbnode_t keyblock, PKT_public_key *pk,
|
||
const void *data, size_t datalen,
|
||
int print_pka, int print_dane)
|
||
{
|
||
gpg_error_t err = 0;
|
||
kbnode_t kbctx, node;
|
||
PKT_user_id *uid;
|
||
char *mbox = NULL;
|
||
char hashbuf[32];
|
||
char *hash = NULL;
|
||
char *domain;
|
||
const char *s;
|
||
unsigned int len;
|
||
estream_t fp = NULL;
|
||
char *hexdata = NULL;
|
||
char *hexfpr;
|
||
|
||
hexfpr = hexfingerprint (pk, NULL, 0);
|
||
hexdata = bin2hex (data, datalen, NULL);
|
||
if (!hexdata)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
ascii_strlwr (hexdata);
|
||
fp = es_fopenmem (0, "rw,samethread");
|
||
if (!fp)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
for (kbctx = NULL; (node = walk_kbnode (keyblock, &kbctx, 0));)
|
||
{
|
||
if (node->pkt->pkttype != PKT_USER_ID)
|
||
continue;
|
||
uid = node->pkt->pkt.user_id;
|
||
|
||
if (uid->is_expired || uid->is_revoked)
|
||
continue;
|
||
|
||
xfree (mbox);
|
||
mbox = mailbox_from_userid (uid->name);
|
||
if (!mbox)
|
||
continue;
|
||
|
||
domain = strchr (mbox, '@');
|
||
*domain++ = 0;
|
||
|
||
if (print_pka)
|
||
{
|
||
es_fprintf (fp, "$ORIGIN _pka.%s.\n; %s\n; ", domain, hexfpr);
|
||
print_utf8_buffer (fp, uid->name, uid->len);
|
||
es_putc ('\n', fp);
|
||
gcry_md_hash_buffer (GCRY_MD_SHA1, hashbuf, mbox, strlen (mbox));
|
||
xfree (hash);
|
||
hash = zb32_encode (hashbuf, 8*20);
|
||
if (!hash)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
len = strlen (hexfpr)/2;
|
||
es_fprintf (fp, "%s TYPE37 \\# %u 0006 0000 00 %02X %s\n\n",
|
||
hash, 6 + len, len, hexfpr);
|
||
}
|
||
|
||
if (print_dane && hexdata)
|
||
{
|
||
es_fprintf (fp, "$ORIGIN _openpgpkey.%s.\n; %s\n; ", domain, hexfpr);
|
||
print_utf8_buffer (fp, uid->name, uid->len);
|
||
es_putc ('\n', fp);
|
||
gcry_md_hash_buffer (GCRY_MD_SHA256, hashbuf, mbox, strlen (mbox));
|
||
xfree (hash);
|
||
hash = bin2hex (hashbuf, 28, NULL);
|
||
if (!hash)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
ascii_strlwr (hash);
|
||
len = strlen (hexdata)/2;
|
||
es_fprintf (fp, "%s TYPE61 \\# %u (\n", hash, len);
|
||
for (s = hexdata; ;)
|
||
{
|
||
es_fprintf (fp, "\t%.64s\n", s);
|
||
if (strlen (s) < 64)
|
||
break;
|
||
s += 64;
|
||
}
|
||
es_fputs ("\t)\n\n", fp);
|
||
}
|
||
}
|
||
|
||
/* Make sure it is a string and write it. */
|
||
es_fputc (0, fp);
|
||
{
|
||
void *vp;
|
||
|
||
if (es_fclose_snatch (fp, &vp, NULL))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
fp = NULL;
|
||
iobuf_writestr (out, vp);
|
||
es_free (vp);
|
||
}
|
||
err = 0;
|
||
|
||
leave:
|
||
xfree (hash);
|
||
xfree (mbox);
|
||
es_fclose (fp);
|
||
xfree (hexdata);
|
||
xfree (hexfpr);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Helper for do_export_stream which writes one keyblock to OUT. */
|
||
static gpg_error_t
|
||
do_export_one_keyblock (ctrl_t ctrl, kbnode_t keyblock, u32 *keyid,
|
||
iobuf_t out, int secret, unsigned int options,
|
||
export_stats_t stats, int *any,
|
||
KEYDB_SEARCH_DESC *desc, size_t ndesc,
|
||
size_t descindex, gcry_cipher_hd_t cipherhd)
|
||
{
|
||
gpg_error_t err;
|
||
char *cache_nonce = NULL;
|
||
subkey_list_t subkey_list = NULL; /* Track already processed subkeys. */
|
||
int skip_until_subkey = 0;
|
||
int cleartext = 0;
|
||
char *hexgrip = NULL;
|
||
char *serialno = NULL;
|
||
PKT_public_key *pk;
|
||
u32 subkidbuf[2], *subkid;
|
||
kbnode_t kbctx, node;
|
||
|
||
for (kbctx=NULL; (node = walk_kbnode (keyblock, &kbctx, 0)); )
|
||
{
|
||
if (skip_until_subkey)
|
||
{
|
||
if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
|
||
skip_until_subkey = 0;
|
||
else
|
||
continue;
|
||
}
|
||
|
||
/* We used to use comment packets, but not any longer. In
|
||
* case we still have comments on a key, strip them here
|
||
* before we call build_packet(). */
|
||
if (node->pkt->pkttype == PKT_COMMENT)
|
||
continue;
|
||
|
||
/* Make sure that ring_trust packets never get exported. */
|
||
if (node->pkt->pkttype == PKT_RING_TRUST)
|
||
continue;
|
||
|
||
/* If exact is set, then we only export what was requested
|
||
* (plus the primary key, if the user didn't specifically
|
||
* request it). */
|
||
if (desc[descindex].exact && node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
|
||
{
|
||
if (!exact_subkey_match_p (desc+descindex, node))
|
||
{
|
||
/* Before skipping this subkey, check whether any
|
||
* other description wants an exact match on a
|
||
* subkey and include that subkey into the output
|
||
* too. Need to add this subkey to a list so that
|
||
* it won't get processed a second time.
|
||
*
|
||
* So the first step here is to check that list and
|
||
* skip in any case if the key is in that list.
|
||
*
|
||
* We need this whole mess because the import
|
||
* function of GnuPG < 2.1 is not able to merge
|
||
* secret keys and thus it is useless to output them
|
||
* as two separate keys and have import merge them.
|
||
*/
|
||
if (subkey_in_list_p (subkey_list, node))
|
||
skip_until_subkey = 1; /* Already processed this one. */
|
||
else
|
||
{
|
||
size_t j;
|
||
|
||
for (j=0; j < ndesc; j++)
|
||
if (j != descindex && desc[j].exact
|
||
&& exact_subkey_match_p (desc+j, node))
|
||
break;
|
||
if (!(j < ndesc))
|
||
skip_until_subkey = 1; /* No other one matching. */
|
||
}
|
||
}
|
||
|
||
if (skip_until_subkey)
|
||
continue;
|
||
|
||
/* Mark this one as processed. */
|
||
{
|
||
subkey_list_t tmp = new_subkey_list_item (node);
|
||
tmp->next = subkey_list;
|
||
subkey_list = tmp;
|
||
}
|
||
}
|
||
|
||
if (node->pkt->pkttype == PKT_SIGNATURE)
|
||
{
|
||
/* Do not export packets which are marked as not
|
||
* exportable. */
|
||
if (!(options & EXPORT_LOCAL_SIGS)
|
||
&& !node->pkt->pkt.signature->flags.exportable)
|
||
continue; /* not exportable */
|
||
|
||
/* Do not export packets with a "sensitive" revocation key
|
||
* unless the user wants us to. Note that we do export
|
||
* these when issuing the actual revocation (see revoke.c). */
|
||
if (!(options & EXPORT_SENSITIVE_REVKEYS)
|
||
&& node->pkt->pkt.signature->revkey)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < node->pkt->pkt.signature->numrevkeys; i++)
|
||
if ((node->pkt->pkt.signature->revkey[i].class & 0x40))
|
||
break;
|
||
if (i < node->pkt->pkt.signature->numrevkeys)
|
||
continue;
|
||
}
|
||
}
|
||
|
||
/* Don't export attribs? */
|
||
if (!(options & EXPORT_ATTRIBUTES)
|
||
&& node->pkt->pkttype == PKT_USER_ID
|
||
&& node->pkt->pkt.user_id->attrib_data)
|
||
{
|
||
/* Skip until we get to something that is not an attrib or a
|
||
* signature on an attrib. */
|
||
while (kbctx->next && kbctx->next->pkt->pkttype == PKT_SIGNATURE)
|
||
kbctx = kbctx->next;
|
||
|
||
continue;
|
||
}
|
||
|
||
if (secret && (node->pkt->pkttype == PKT_PUBLIC_KEY
|
||
|| node->pkt->pkttype == PKT_PUBLIC_SUBKEY))
|
||
{
|
||
pk = node->pkt->pkt.public_key;
|
||
if (node->pkt->pkttype == PKT_PUBLIC_KEY)
|
||
subkid = NULL;
|
||
else
|
||
{
|
||
keyid_from_pk (pk, subkidbuf);
|
||
subkid = subkidbuf;
|
||
}
|
||
|
||
if (pk->seckey_info)
|
||
{
|
||
log_error ("key %s: oops: seckey_info already set"
|
||
" - skipped\n", keystr_with_sub (keyid, subkid));
|
||
skip_until_subkey = 1;
|
||
continue;
|
||
}
|
||
|
||
xfree (hexgrip);
|
||
err = hexkeygrip_from_pk (pk, &hexgrip);
|
||
if (err)
|
||
{
|
||
log_error ("key %s: error computing keygrip: %s"
|
||
" - skipped\n", keystr_with_sub (keyid, subkid),
|
||
gpg_strerror (err));
|
||
skip_until_subkey = 1;
|
||
err = 0;
|
||
continue;
|
||
}
|
||
|
||
xfree (serialno);
|
||
serialno = NULL;
|
||
if (secret == 2 && node->pkt->pkttype == PKT_PUBLIC_KEY)
|
||
{
|
||
/* We are asked not to export the secret parts of the
|
||
* primary key. Make up an error code to create the
|
||
* stub. */
|
||
err = GPG_ERR_NOT_FOUND;
|
||
}
|
||
else
|
||
err = agent_get_keyinfo (ctrl, hexgrip, &serialno, &cleartext);
|
||
|
||
if ((!err && serialno)
|
||
&& secret == 2 && node->pkt->pkttype == PKT_PUBLIC_KEY)
|
||
{
|
||
/* It does not make sense to export a key with its
|
||
* primary key on card using a non-key stub. Thus we
|
||
* skip those keys when used with --export-secret-subkeys. */
|
||
log_info (_("key %s: key material on-card - skipped\n"),
|
||
keystr_with_sub (keyid, subkid));
|
||
skip_until_subkey = 1;
|
||
}
|
||
else if (gpg_err_code (err) == GPG_ERR_NOT_FOUND
|
||
|| (!err && serialno))
|
||
{
|
||
/* Create a key stub. */
|
||
struct seckey_info *ski;
|
||
const char *s;
|
||
|
||
pk->seckey_info = ski = xtrycalloc (1, sizeof *ski);
|
||
if (!ski)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
ski->is_protected = 1;
|
||
if (err)
|
||
ski->s2k.mode = 1001; /* GNU dummy (no secret key). */
|
||
else
|
||
{
|
||
ski->s2k.mode = 1002; /* GNU-divert-to-card. */
|
||
for (s=serialno; sizeof (ski->ivlen) && *s && s[1];
|
||
ski->ivlen++, s += 2)
|
||
ski->iv[ski->ivlen] = xtoi_2 (s);
|
||
}
|
||
|
||
err = build_packet (out, node->pkt);
|
||
if (!err && node->pkt->pkttype == PKT_PUBLIC_KEY)
|
||
{
|
||
stats->exported++;
|
||
print_status_exported (node->pkt->pkt.public_key);
|
||
}
|
||
}
|
||
else if (!err)
|
||
{
|
||
err = receive_seckey_from_agent (ctrl, cipherhd,
|
||
cleartext, &cache_nonce,
|
||
hexgrip, pk);
|
||
if (err)
|
||
{
|
||
if (gpg_err_code (err) == GPG_ERR_FULLY_CANCELED)
|
||
goto leave;
|
||
skip_until_subkey = 1;
|
||
err = 0;
|
||
}
|
||
else
|
||
{
|
||
err = build_packet (out, node->pkt);
|
||
if (node->pkt->pkttype == PKT_PUBLIC_KEY)
|
||
{
|
||
stats->exported++;
|
||
print_status_exported (node->pkt->pkt.public_key);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
log_error ("key %s: error getting keyinfo from agent: %s"
|
||
" - skipped\n", keystr_with_sub (keyid, subkid),
|
||
gpg_strerror (err));
|
||
skip_until_subkey = 1;
|
||
err = 0;
|
||
}
|
||
|
||
xfree (pk->seckey_info);
|
||
pk->seckey_info = NULL;
|
||
{
|
||
int i;
|
||
for (i = pubkey_get_npkey (pk->pubkey_algo);
|
||
i < pubkey_get_nskey (pk->pubkey_algo); i++)
|
||
{
|
||
gcry_mpi_release (pk->pkey[i]);
|
||
pk->pkey[i] = NULL;
|
||
}
|
||
}
|
||
}
|
||
else /* Not secret or common packets. */
|
||
{
|
||
err = build_packet (out, node->pkt);
|
||
if (!err && node->pkt->pkttype == PKT_PUBLIC_KEY)
|
||
{
|
||
stats->exported++;
|
||
print_status_exported (node->pkt->pkt.public_key);
|
||
}
|
||
}
|
||
|
||
if (err)
|
||
{
|
||
log_error ("build_packet(%d) failed: %s\n",
|
||
node->pkt->pkttype, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
if (!skip_until_subkey)
|
||
*any = 1;
|
||
}
|
||
|
||
leave:
|
||
release_subkey_list (subkey_list);
|
||
xfree (serialno);
|
||
xfree (hexgrip);
|
||
xfree (cache_nonce);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Export the keys identified by the list of strings in USERS to the
|
||
stream OUT. If SECRET is false public keys will be exported. With
|
||
secret true secret keys will be exported; in this case 1 means the
|
||
entire secret keyblock and 2 only the subkeys. OPTIONS are the
|
||
export options to apply. If KEYBLOCK_OUT is not NULL, AND the exit
|
||
code is zero, a pointer to the first keyblock found and exported
|
||
will be stored at this address; no other keyblocks are exported in
|
||
this case. The caller must free the returned keyblock. If any
|
||
key has been exported true is stored at ANY. */
|
||
static int
|
||
do_export_stream (ctrl_t ctrl, iobuf_t out, strlist_t users, int secret,
|
||
kbnode_t *keyblock_out, unsigned int options,
|
||
export_stats_t stats, int *any)
|
||
{
|
||
gpg_error_t err = 0;
|
||
PACKET pkt;
|
||
kbnode_t keyblock = NULL;
|
||
kbnode_t node;
|
||
size_t ndesc, descindex;
|
||
KEYDB_SEARCH_DESC *desc = NULL;
|
||
KEYDB_HANDLE kdbhd;
|
||
strlist_t sl;
|
||
gcry_cipher_hd_t cipherhd = NULL;
|
||
struct export_stats_s dummystats;
|
||
iobuf_t out_help = NULL;
|
||
|
||
if (!stats)
|
||
stats = &dummystats;
|
||
*any = 0;
|
||
init_packet (&pkt);
|
||
kdbhd = keydb_new ();
|
||
if (!kdbhd)
|
||
return gpg_error_from_syserror ();
|
||
|
||
/* For the PKA and DANE format open a helper iobuf and for DANE
|
||
* enforce some options. */
|
||
if ((options & (EXPORT_PKA_FORMAT | EXPORT_DANE_FORMAT)))
|
||
{
|
||
out_help = iobuf_temp ();
|
||
if ((options & EXPORT_DANE_FORMAT))
|
||
options |= EXPORT_MINIMAL | EXPORT_CLEAN;
|
||
}
|
||
|
||
if (!users)
|
||
{
|
||
ndesc = 1;
|
||
desc = xcalloc (ndesc, sizeof *desc);
|
||
desc[0].mode = KEYDB_SEARCH_MODE_FIRST;
|
||
}
|
||
else
|
||
{
|
||
for (ndesc=0, sl=users; sl; sl = sl->next, ndesc++)
|
||
;
|
||
desc = xmalloc ( ndesc * sizeof *desc);
|
||
|
||
for (ndesc=0, sl=users; sl; sl = sl->next)
|
||
{
|
||
if (!(err=classify_user_id (sl->d, desc+ndesc, 1)))
|
||
ndesc++;
|
||
else
|
||
log_error (_("key \"%s\" not found: %s\n"),
|
||
sl->d, gpg_strerror (err));
|
||
}
|
||
|
||
keydb_disable_caching (kdbhd); /* We are looping the search. */
|
||
|
||
/* It would be nice to see which of the given users did actually
|
||
match one in the keyring. To implement this we need to have
|
||
a found flag for each entry in desc. To set this flag we
|
||
must check all those entries after a match to mark all
|
||
matched one - currently we stop at the first match. To do
|
||
this we need an extra flag to enable this feature. */
|
||
}
|
||
|
||
#ifdef ENABLE_SELINUX_HACKS
|
||
if (secret)
|
||
{
|
||
log_error (_("exporting secret keys not allowed\n"));
|
||
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
|
||
goto leave;
|
||
}
|
||
#endif
|
||
|
||
/* For secret key export we need to setup a decryption context. */
|
||
if (secret)
|
||
{
|
||
void *kek = NULL;
|
||
size_t keklen;
|
||
|
||
err = agent_keywrap_key (ctrl, 1, &kek, &keklen);
|
||
if (err)
|
||
{
|
||
log_error ("error getting the KEK: %s\n", gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
/* Prepare a cipher context. */
|
||
err = gcry_cipher_open (&cipherhd, GCRY_CIPHER_AES128,
|
||
GCRY_CIPHER_MODE_AESWRAP, 0);
|
||
if (!err)
|
||
err = gcry_cipher_setkey (cipherhd, kek, keklen);
|
||
if (err)
|
||
{
|
||
log_error ("error setting up an encryption context: %s\n",
|
||
gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
xfree (kek);
|
||
kek = NULL;
|
||
}
|
||
|
||
for (;;)
|
||
{
|
||
u32 keyid[2];
|
||
PKT_public_key *pk;
|
||
|
||
err = keydb_search (kdbhd, desc, ndesc, &descindex);
|
||
if (!users)
|
||
desc[0].mode = KEYDB_SEARCH_MODE_NEXT;
|
||
if (err)
|
||
break;
|
||
|
||
/* Read the keyblock. */
|
||
release_kbnode (keyblock);
|
||
keyblock = NULL;
|
||
err = keydb_get_keyblock (kdbhd, &keyblock);
|
||
if (err)
|
||
{
|
||
log_error (_("error reading keyblock: %s\n"), gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
node = find_kbnode (keyblock, PKT_PUBLIC_KEY);
|
||
if (!node)
|
||
{
|
||
log_error ("public key packet not found in keyblock - skipped\n");
|
||
continue;
|
||
}
|
||
stats->count++;
|
||
setup_main_keyids (keyblock); /* gpg_format_keydesc needs it. */
|
||
pk = node->pkt->pkt.public_key;
|
||
keyid_from_pk (pk, keyid);
|
||
|
||
/* If a secret key export is required we need to check whether
|
||
we have a secret key at all and if so create the seckey_info
|
||
structure. */
|
||
if (secret)
|
||
{
|
||
if (agent_probe_any_secret_key (ctrl, keyblock))
|
||
continue; /* No secret key (neither primary nor subkey). */
|
||
|
||
/* No v3 keys with GNU mode 1001. */
|
||
if (secret == 2 && pk->version == 3)
|
||
{
|
||
log_info (_("key %s: PGP 2.x style key - skipped\n"),
|
||
keystr (keyid));
|
||
continue;
|
||
}
|
||
|
||
/* The agent does not yet allow export of v3 packets. It is
|
||
actually questionable whether we should allow them at
|
||
all. */
|
||
if (pk->version == 3)
|
||
{
|
||
log_info ("key %s: PGP 2.x style key (v3) export "
|
||
"not yet supported - skipped\n", keystr (keyid));
|
||
continue;
|
||
}
|
||
stats->secret_count++;
|
||
}
|
||
|
||
/* Always do the cleaning on the public key part if requested.
|
||
Note that we don't yet set this option if we are exporting
|
||
secret keys. Note that both export-clean and export-minimal
|
||
only apply to UID sigs (0x10, 0x11, 0x12, and 0x13). A
|
||
designated revocation is never stripped, even with
|
||
export-minimal set. */
|
||
if ((options & EXPORT_CLEAN))
|
||
clean_key (keyblock, opt.verbose, (options&EXPORT_MINIMAL), NULL, NULL);
|
||
|
||
if (export_keep_uid)
|
||
{
|
||
commit_kbnode (&keyblock);
|
||
apply_keep_uid_filter (keyblock, export_keep_uid);
|
||
commit_kbnode (&keyblock);
|
||
}
|
||
|
||
if (export_drop_subkey)
|
||
{
|
||
commit_kbnode (&keyblock);
|
||
apply_drop_subkey_filter (keyblock, export_drop_subkey);
|
||
commit_kbnode (&keyblock);
|
||
}
|
||
|
||
/* And write it. */
|
||
err = do_export_one_keyblock (ctrl, keyblock, keyid,
|
||
out_help? out_help : out,
|
||
secret, options, stats, any,
|
||
desc, ndesc, descindex, cipherhd);
|
||
if (err)
|
||
break;
|
||
|
||
if (keyblock_out)
|
||
{
|
||
*keyblock_out = keyblock;
|
||
break;
|
||
}
|
||
|
||
if (out_help)
|
||
{
|
||
/* We want to write PKA or DANE records. OUT_HELP has the
|
||
* keyblock and we print a record for each uid to OUT. */
|
||
const void *data;
|
||
size_t datalen;
|
||
|
||
iobuf_flush_temp (out_help);
|
||
data = iobuf_get_temp_buffer (out_help);
|
||
datalen = iobuf_get_temp_length (out_help);
|
||
|
||
err = print_pka_or_dane_records (out,
|
||
keyblock, pk, data, datalen,
|
||
(options & EXPORT_PKA_FORMAT),
|
||
(options & EXPORT_DANE_FORMAT));
|
||
if (err)
|
||
goto leave;
|
||
|
||
iobuf_close (out_help);
|
||
out_help = iobuf_temp ();
|
||
}
|
||
|
||
}
|
||
if (gpg_err_code (err) == GPG_ERR_NOT_FOUND)
|
||
err = 0;
|
||
|
||
leave:
|
||
iobuf_cancel (out_help);
|
||
gcry_cipher_close (cipherhd);
|
||
xfree(desc);
|
||
keydb_release (kdbhd);
|
||
if (err || !keyblock_out)
|
||
release_kbnode( keyblock );
|
||
if( !*any )
|
||
log_info(_("WARNING: nothing exported\n"));
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
|
||
static gpg_error_t
|
||
key_to_sshblob (membuf_t *mb, const char *identifier, ...)
|
||
{
|
||
va_list arg_ptr;
|
||
gpg_error_t err = 0;
|
||
unsigned char nbuf[4];
|
||
unsigned char *buf;
|
||
size_t buflen;
|
||
gcry_mpi_t a;
|
||
|
||
ulongtobuf (nbuf, (ulong)strlen (identifier));
|
||
put_membuf (mb, nbuf, 4);
|
||
put_membuf_str (mb, identifier);
|
||
if (!strncmp (identifier, "ecdsa-sha2-", 11))
|
||
{
|
||
ulongtobuf (nbuf, (ulong)strlen (identifier+11));
|
||
put_membuf (mb, nbuf, 4);
|
||
put_membuf_str (mb, identifier+11);
|
||
}
|
||
va_start (arg_ptr, identifier);
|
||
while ((a = va_arg (arg_ptr, gcry_mpi_t)))
|
||
{
|
||
err = gcry_mpi_aprint (GCRYMPI_FMT_SSH, &buf, &buflen, a);
|
||
if (err)
|
||
break;
|
||
if (!strcmp (identifier, "ssh-ed25519")
|
||
&& buflen > 5 && buf[4] == 0x40)
|
||
{
|
||
/* We need to strip our 0x40 prefix. */
|
||
put_membuf (mb, "\x00\x00\x00\x20", 4);
|
||
put_membuf (mb, buf+5, buflen-5);
|
||
}
|
||
else
|
||
put_membuf (mb, buf, buflen);
|
||
gcry_free (buf);
|
||
}
|
||
va_end (arg_ptr);
|
||
return err;
|
||
}
|
||
|
||
/* Export the key identified by USERID in the SSH public key format.
|
||
The function exports the latest subkey with Authentication
|
||
capability unless the '!' suffix is used to export a specific
|
||
key. */
|
||
gpg_error_t
|
||
export_ssh_key (ctrl_t ctrl, const char *userid)
|
||
{
|
||
gpg_error_t err;
|
||
kbnode_t keyblock = NULL;
|
||
KEYDB_SEARCH_DESC desc;
|
||
u32 latest_date;
|
||
u32 curtime = make_timestamp ();
|
||
kbnode_t latest_key, node;
|
||
PKT_public_key *pk;
|
||
const char *identifier;
|
||
membuf_t mb;
|
||
estream_t fp = NULL;
|
||
struct b64state b64_state;
|
||
const char *fname = "-";
|
||
|
||
init_membuf (&mb, 4096);
|
||
|
||
/* We need to know whether the key has been specified using the
|
||
exact syntax ('!' suffix). Thus we need to run a
|
||
classify_user_id on our own. */
|
||
err = classify_user_id (userid, &desc, 1);
|
||
|
||
/* Get the public key. */
|
||
if (!err)
|
||
{
|
||
getkey_ctx_t getkeyctx;
|
||
|
||
err = get_pubkey_byname (ctrl, &getkeyctx, NULL, userid, &keyblock,
|
||
NULL,
|
||
0 /* Only usable keys or given exact. */,
|
||
1 /* No AKL lookup. */);
|
||
if (!err)
|
||
{
|
||
err = getkey_next (getkeyctx, NULL, NULL);
|
||
if (!err)
|
||
err = gpg_error (GPG_ERR_AMBIGUOUS_NAME);
|
||
else if (gpg_err_code (err) == GPG_ERR_NO_PUBKEY)
|
||
err = 0;
|
||
}
|
||
getkey_end (getkeyctx);
|
||
}
|
||
if (err)
|
||
{
|
||
log_error (_("key \"%s\" not found: %s\n"), userid, gpg_strerror (err));
|
||
return err;
|
||
}
|
||
|
||
/* The finish_lookup code in getkey.c does not handle auth keys,
|
||
thus we have to duplicate the code here to find the latest
|
||
subkey. However, if the key has been found using an exact match
|
||
('!' notation) we use that key without any further checks and
|
||
even allow the use of the primary key. */
|
||
latest_date = 0;
|
||
latest_key = NULL;
|
||
for (node = keyblock; node; node = node->next)
|
||
{
|
||
if ((node->pkt->pkttype == PKT_PUBLIC_SUBKEY
|
||
|| node->pkt->pkttype == PKT_PUBLIC_KEY)
|
||
&& node->pkt->pkt.public_key->flags.exact)
|
||
{
|
||
latest_key = node;
|
||
break;
|
||
}
|
||
}
|
||
if (!latest_key)
|
||
{
|
||
for (node = keyblock; node; node = node->next)
|
||
{
|
||
if (node->pkt->pkttype != PKT_PUBLIC_SUBKEY)
|
||
continue;
|
||
|
||
pk = node->pkt->pkt.public_key;
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tchecking subkey %08lX\n",
|
||
(ulong) keyid_from_pk (pk, NULL));
|
||
if (!(pk->pubkey_usage & PUBKEY_USAGE_AUTH))
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tsubkey not usable for authentication\n");
|
||
continue;
|
||
}
|
||
if (!pk->flags.valid)
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tsubkey not valid\n");
|
||
continue;
|
||
}
|
||
if (pk->flags.revoked)
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tsubkey has been revoked\n");
|
||
continue;
|
||
}
|
||
if (pk->has_expired)
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tsubkey has expired\n");
|
||
continue;
|
||
}
|
||
if (pk->timestamp > curtime && !opt.ignore_valid_from)
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tsubkey not yet valid\n");
|
||
continue;
|
||
}
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tsubkey might be fine\n");
|
||
/* In case a key has a timestamp of 0 set, we make sure that it
|
||
is used. A better change would be to compare ">=" but that
|
||
might also change the selected keys and is as such a more
|
||
intrusive change. */
|
||
if (pk->timestamp > latest_date || (!pk->timestamp && !latest_date))
|
||
{
|
||
latest_date = pk->timestamp;
|
||
latest_key = node;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!latest_key)
|
||
{
|
||
err = gpg_error (GPG_ERR_UNUSABLE_PUBKEY);
|
||
log_error (_("key \"%s\" not found: %s\n"), userid, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
pk = latest_key->pkt->pkt.public_key;
|
||
if (DBG_LOOKUP)
|
||
log_debug ("\tusing key %08lX\n", (ulong) keyid_from_pk (pk, NULL));
|
||
|
||
switch (pk->pubkey_algo)
|
||
{
|
||
case PUBKEY_ALGO_DSA:
|
||
identifier = "ssh-dss";
|
||
err = key_to_sshblob (&mb, identifier,
|
||
pk->pkey[0], pk->pkey[1], pk->pkey[2], pk->pkey[3],
|
||
NULL);
|
||
break;
|
||
|
||
case PUBKEY_ALGO_RSA:
|
||
case PUBKEY_ALGO_RSA_S:
|
||
identifier = "ssh-rsa";
|
||
err = key_to_sshblob (&mb, identifier, pk->pkey[1], pk->pkey[0], NULL);
|
||
break;
|
||
|
||
case PUBKEY_ALGO_ECDSA:
|
||
{
|
||
char *curveoid;
|
||
const char *curve;
|
||
|
||
curveoid = openpgp_oid_to_str (pk->pkey[0]);
|
||
if (!curveoid)
|
||
err = gpg_error_from_syserror ();
|
||
else if (!(curve = openpgp_oid_to_curve (curveoid, 0)))
|
||
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
else
|
||
{
|
||
if (!strcmp (curve, "nistp256"))
|
||
identifier = "ecdsa-sha2-nistp256";
|
||
else if (!strcmp (curve, "nistp384"))
|
||
identifier = "ecdsa-sha2-nistp384";
|
||
else if (!strcmp (curve, "nistp521"))
|
||
identifier = "ecdsa-sha2-nistp521";
|
||
else
|
||
identifier = NULL;
|
||
|
||
if (!identifier)
|
||
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
else
|
||
err = key_to_sshblob (&mb, identifier, pk->pkey[1], NULL);
|
||
}
|
||
xfree (curveoid);
|
||
}
|
||
break;
|
||
|
||
case PUBKEY_ALGO_EDDSA:
|
||
if (!openpgp_oid_is_ed25519 (pk->pkey[0]))
|
||
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
else
|
||
{
|
||
identifier = "ssh-ed25519";
|
||
err = key_to_sshblob (&mb, identifier, pk->pkey[1], NULL);
|
||
}
|
||
break;
|
||
|
||
case PUBKEY_ALGO_ELGAMAL_E:
|
||
case PUBKEY_ALGO_ELGAMAL:
|
||
err = gpg_error (GPG_ERR_UNUSABLE_PUBKEY);
|
||
break;
|
||
|
||
default:
|
||
err = GPG_ERR_PUBKEY_ALGO;
|
||
break;
|
||
}
|
||
|
||
if (err)
|
||
goto leave;
|
||
|
||
if (opt.outfile && *opt.outfile && strcmp (opt.outfile, "-"))
|
||
fp = es_fopen ((fname = opt.outfile), "w");
|
||
else
|
||
fp = es_stdout;
|
||
if (!fp)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
es_fprintf (fp, "%s ", identifier);
|
||
err = b64enc_start_es (&b64_state, fp, "");
|
||
if (err)
|
||
goto leave;
|
||
{
|
||
void *blob;
|
||
size_t bloblen;
|
||
|
||
blob = get_membuf (&mb, &bloblen);
|
||
if (!blob)
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
err = b64enc_write (&b64_state, blob, bloblen);
|
||
xfree (blob);
|
||
if (err)
|
||
goto leave;
|
||
}
|
||
err = b64enc_finish (&b64_state);
|
||
if (err)
|
||
goto leave;
|
||
es_fprintf (fp, " openpgp:0x%08lX\n", (ulong)keyid_from_pk (pk, NULL));
|
||
|
||
if (es_ferror (fp))
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
{
|
||
if (es_fclose (fp))
|
||
err = gpg_error_from_syserror ();
|
||
fp = NULL;
|
||
}
|
||
|
||
if (err)
|
||
log_error (_("error writing '%s': %s\n"), fname, gpg_strerror (err));
|
||
|
||
leave:
|
||
es_fclose (fp);
|
||
xfree (get_membuf (&mb, NULL));
|
||
release_kbnode (keyblock);
|
||
return err;
|
||
}
|