5942b0c7e0
* src/sign.c (gpgme_op_sign_result): Test that invalid and valid signatures add up to gpgme_signers_count(). -- When invalid and valid signatures do not equal gpgme_signers_count() it means that there was a bad passphrase during signing after the first signer. This leaves the result.signatures from previous signers intact which isn't correct since gpg will report: gpg: number of one-pass packets does not match number of signature packets gpg: can't handle this ambiguous signature data during verify. So when this happens append the valid signatures to the .invalid_signers list with .reason set to GPG_ERR_GENERAL.
469 lines
11 KiB
C
469 lines
11 KiB
C
/* sign.c - Signing function.
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Copyright (C) 2000 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2003, 2004, 2007 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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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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/* Suppress warning for accessing deprecated member "class". */
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#define _GPGME_IN_GPGME 1
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#include "gpgme.h"
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#include "context.h"
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#include "ops.h"
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#include "util.h"
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#include "debug.h"
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typedef struct
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{
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struct _gpgme_op_sign_result result;
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/* A pointer to the next pointer of the last invalid signer in
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the list. This makes appending new invalid signers painless
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while preserving the order. */
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gpgme_invalid_key_t *last_signer_p;
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/* Likewise for signature information. */
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gpgme_new_signature_t *last_sig_p;
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/* Flags used while processing the status lines. */
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unsigned int ignore_inv_recp:1;
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unsigned int inv_sgnr_seen:1;
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unsigned int sig_created_seen:1;
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} *op_data_t;
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static void release_signatures (gpgme_new_signature_t sig)
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{
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while (sig)
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{
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gpgme_new_signature_t next = sig->next;
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free (sig->fpr);
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free (sig);
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sig = next;
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}
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}
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static void
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release_op_data (void *hook)
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{
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op_data_t opd = (op_data_t) hook;
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gpgme_invalid_key_t invalid_signer = opd->result.invalid_signers;
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while (invalid_signer)
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{
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gpgme_invalid_key_t next = invalid_signer->next;
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if (invalid_signer->fpr)
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free (invalid_signer->fpr);
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free (invalid_signer);
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invalid_signer = next;
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}
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release_signatures (opd->result.signatures);
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}
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gpgme_sign_result_t
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gpgme_op_sign_result (gpgme_ctx_t ctx)
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{
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void *hook;
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op_data_t opd;
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gpgme_error_t err;
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TRACE_BEG (DEBUG_CTX, "gpgme_op_sign_result", ctx);
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err = _gpgme_op_data_lookup (ctx, OPDATA_SIGN, &hook, -1, NULL);
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opd = hook;
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if (err || !opd)
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{
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TRACE_SUC0 ("result=(null)");
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return NULL;
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}
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if (_gpgme_debug_trace ())
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{
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gpgme_invalid_key_t inv_key = opd->result.invalid_signers;
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gpgme_new_signature_t sig = opd->result.signatures;
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int inv_signers = 0;
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int signatures = 0;
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while (inv_key)
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{
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inv_signers++;
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inv_key = inv_key->next;
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}
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while (sig)
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{
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signatures++;
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sig = sig->next;
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}
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if (gpgme_signers_count (ctx)
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&& signatures + inv_signers != gpgme_signers_count (ctx))
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{
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TRACE_LOG3 ("result: invalid signers: %i, signatures: %i, count: %i",
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inv_signers, signatures, gpgme_signers_count (ctx));
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sig = opd->result.signatures;
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while (sig)
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{
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gpgme_invalid_key_t key;
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key = malloc (sizeof (*key));
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key->fpr = strdup (sig->fpr);
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key->reason = GPG_ERR_GENERAL;
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key->next = NULL;
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inv_key = opd->result.invalid_signers;
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if (!inv_key)
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{
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opd->result.invalid_signers = inv_key = key;
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sig = sig->next;
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continue;
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}
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while (inv_key)
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{
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if (!inv_key->next)
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{
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inv_key->next = key;
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break;
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}
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inv_key = inv_key->next;
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}
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sig = sig->next;
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}
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release_signatures (opd->result.signatures);
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opd->result.signatures = NULL;
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}
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TRACE_LOG2 ("result: invalid signers: %i, signatures: %i",
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inv_signers, signatures);
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inv_key = opd->result.invalid_signers;
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while (inv_key)
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{
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TRACE_LOG3 ("result: invalid signer: fpr=%s, reason=%s <%s>",
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inv_key->fpr, gpgme_strerror (inv_key->reason),
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gpgme_strsource (inv_key->reason));
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inv_key = inv_key->next;
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}
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sig = opd->result.signatures;
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while (sig)
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{
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TRACE_LOG6 ("result: signature: type=%i, pubkey_algo=%i, "
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"hash_algo=%i, timestamp=%li, fpr=%s, sig_class=%i",
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sig->type, sig->pubkey_algo, sig->hash_algo,
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sig->timestamp, sig->fpr, sig->sig_class);
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sig = sig->next;
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}
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}
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TRACE_SUC1 ("result=%p", &opd->result);
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return &opd->result;
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}
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static gpgme_error_t
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parse_sig_created (char *args, gpgme_new_signature_t *sigp,
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gpgme_protocol_t protocol)
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{
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gpgme_new_signature_t sig;
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char *tail;
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sig = malloc (sizeof (*sig));
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if (!sig)
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return gpg_error_from_syserror ();
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sig->next = NULL;
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switch (*args)
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{
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case 'S':
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sig->type = GPGME_SIG_MODE_NORMAL;
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break;
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case 'D':
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sig->type = GPGME_SIG_MODE_DETACH;
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break;
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case 'C':
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sig->type = GPGME_SIG_MODE_CLEAR;
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break;
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default:
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/* The backend engine is not behaving. */
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free (sig);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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args++;
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if (*args != ' ')
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{
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free (sig);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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gpg_err_set_errno (0);
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sig->pubkey_algo = _gpgme_map_pk_algo (strtol (args, &tail, 0), protocol);
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if (errno || args == tail || *tail != ' ')
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{
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/* The crypto backend does not behave. */
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free (sig);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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args = tail;
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sig->hash_algo = strtol (args, &tail, 0);
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if (errno || args == tail || *tail != ' ')
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{
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/* The crypto backend does not behave. */
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free (sig);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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args = tail;
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sig->sig_class = strtol (args, &tail, 0);
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sig->class = sig->sig_class;
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sig->_obsolete_class = sig->sig_class;
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if (errno || args == tail || *tail != ' ')
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{
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/* The crypto backend does not behave. */
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free (sig);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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args = tail;
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sig->timestamp = _gpgme_parse_timestamp (args, &tail);
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if (sig->timestamp == -1 || args == tail || *tail != ' ')
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{
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/* The crypto backend does not behave. */
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free (sig);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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args = tail;
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while (*args == ' ')
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args++;
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if (!*args)
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{
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/* The crypto backend does not behave. */
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free (sig);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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tail = strchr (args, ' ');
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if (tail)
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*tail = '\0';
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sig->fpr = strdup (args);
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if (!sig->fpr)
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{
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free (sig);
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return gpg_error_from_syserror ();
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}
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*sigp = sig;
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return 0;
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}
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gpgme_error_t
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_gpgme_sign_status_handler (void *priv, gpgme_status_code_t code, char *args)
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{
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gpgme_ctx_t ctx = (gpgme_ctx_t) priv;
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gpgme_error_t err;
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void *hook;
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op_data_t opd;
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err = _gpgme_passphrase_status_handler (priv, code, args);
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if (err)
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return err;
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err = _gpgme_op_data_lookup (ctx, OPDATA_SIGN, &hook, -1, NULL);
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opd = hook;
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if (err)
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return err;
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switch (code)
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{
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case GPGME_STATUS_SIG_CREATED:
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opd->sig_created_seen = 1;
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err = parse_sig_created (args, opd->last_sig_p, ctx->protocol);
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if (err)
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return err;
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opd->last_sig_p = &(*opd->last_sig_p)->next;
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break;
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case GPGME_STATUS_INV_RECP:
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if (opd->inv_sgnr_seen && opd->ignore_inv_recp)
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break;
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/* FALLTROUGH */
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case GPGME_STATUS_INV_SGNR:
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if (code == GPGME_STATUS_INV_SGNR)
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opd->inv_sgnr_seen = 1;
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err = _gpgme_parse_inv_recp (args, opd->last_signer_p);
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if (err)
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return err;
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opd->last_signer_p = &(*opd->last_signer_p)->next;
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break;
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case GPGME_STATUS_EOF:
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/* The UI server does not send information about the created
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signature. This is irrelevant for this protocol and thus we
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should not check for that. */
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if (opd->result.invalid_signers)
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err = gpg_error (GPG_ERR_UNUSABLE_SECKEY);
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else if (!opd->sig_created_seen
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&& ctx->protocol != GPGME_PROTOCOL_UISERVER)
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err = gpg_error (GPG_ERR_GENERAL);
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break;
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default:
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break;
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}
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return err;
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}
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static gpgme_error_t
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sign_status_handler (void *priv, gpgme_status_code_t code, char *args)
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{
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gpgme_error_t err;
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err = _gpgme_progress_status_handler (priv, code, args);
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if (!err)
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err = _gpgme_sign_status_handler (priv, code, args);
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return err;
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}
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static gpgme_error_t
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sign_init_result (gpgme_ctx_t ctx, int ignore_inv_recp)
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{
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gpgme_error_t err;
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void *hook;
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op_data_t opd;
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err = _gpgme_op_data_lookup (ctx, OPDATA_SIGN, &hook,
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sizeof (*opd), release_op_data);
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opd = hook;
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if (err)
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return err;
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opd->last_signer_p = &opd->result.invalid_signers;
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opd->last_sig_p = &opd->result.signatures;
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opd->ignore_inv_recp = !!ignore_inv_recp;
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opd->inv_sgnr_seen = 0;
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opd->sig_created_seen = 0;
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return 0;
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}
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gpgme_error_t
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_gpgme_op_sign_init_result (gpgme_ctx_t ctx)
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{
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return sign_init_result (ctx, 0);
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}
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static gpgme_error_t
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sign_start (gpgme_ctx_t ctx, int synchronous, gpgme_data_t plain,
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gpgme_data_t sig, gpgme_sig_mode_t mode)
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{
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gpgme_error_t err;
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err = _gpgme_op_reset (ctx, synchronous);
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if (err)
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return err;
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/* If we are using the CMS protocol, we ignore the INV_RECP status
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code if a newer GPGSM is in use. GPGMS does not support combined
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sign+encrypt and thus this can't harm. */
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err = sign_init_result (ctx, (ctx->protocol == GPGME_PROTOCOL_CMS));
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if (err)
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return err;
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if (mode != GPGME_SIG_MODE_NORMAL && mode != GPGME_SIG_MODE_DETACH
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&& mode != GPGME_SIG_MODE_CLEAR)
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return gpg_error (GPG_ERR_INV_VALUE);
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if (!plain)
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return gpg_error (GPG_ERR_NO_DATA);
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if (!sig)
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return gpg_error (GPG_ERR_INV_VALUE);
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if (ctx->passphrase_cb)
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{
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err = _gpgme_engine_set_command_handler
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(ctx->engine, _gpgme_passphrase_command_handler, ctx, NULL);
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if (err)
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return err;
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}
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_gpgme_engine_set_status_handler (ctx->engine, sign_status_handler,
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ctx);
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return _gpgme_engine_op_sign (ctx->engine, plain, sig, mode, ctx->use_armor,
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ctx->use_textmode, ctx->include_certs,
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ctx /* FIXME */);
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}
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/* Sign the plaintext PLAIN and store the signature in SIG. */
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gpgme_error_t
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gpgme_op_sign_start (gpgme_ctx_t ctx, gpgme_data_t plain, gpgme_data_t sig,
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gpgme_sig_mode_t mode)
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{
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gpg_error_t err;
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TRACE_BEG3 (DEBUG_CTX, "gpgme_op_sign_start", ctx,
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"plain=%p, sig=%p, mode=%i", plain, sig, mode);
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if (!ctx)
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return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
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err = sign_start (ctx, 0, plain, sig, mode);
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return TRACE_ERR (err);
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}
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/* Sign the plaintext PLAIN and store the signature in SIG. */
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gpgme_error_t
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gpgme_op_sign (gpgme_ctx_t ctx, gpgme_data_t plain, gpgme_data_t sig,
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gpgme_sig_mode_t mode)
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{
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gpgme_error_t err;
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TRACE_BEG3 (DEBUG_CTX, "gpgme_op_sign", ctx,
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"plain=%p, sig=%p, mode=%i", plain, sig, mode);
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if (!ctx)
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return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
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err = sign_start (ctx, 1, plain, sig, mode);
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if (!err)
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err = _gpgme_wait_one (ctx);
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return TRACE_ERR (err);
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}
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