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/* decrypt.c - Decrypt function.
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Copyright (C) 2000 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2003, 2004, 2017 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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d7e8d0 |
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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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#include <assert.h>
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#include "debug.h"
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#include "gpgme.h"
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#include "util.h"
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#include "context.h"
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#include "ops.h"
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typedef struct
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{
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struct _gpgme_op_decrypt_result result;
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/* The error code from a FAILURE status line or 0. */
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gpg_error_t failure_code;
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int okay;
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/* A flag telling that the a decryption failed and an optional error
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* code to further specify the failure. */
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int failed;
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gpg_error_t pkdecrypt_failed;
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/* At least one secret key is not available. gpg issues NO_SECKEY
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* status lines for each key the message has been encrypted to but
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* that secret key is not available. This can't be done for hidden
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* recipients, though. We track it here to allow for a better error
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* message that the general DECRYPTION_FAILED. */
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int any_no_seckey;
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/* A pointer to the next pointer of the last recipient in the list.
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This makes appending new invalid signers painless while
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preserving the order. */
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gpgme_recipient_t *last_recipient_p;
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} *op_data_t;
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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_recipient_t recipient = opd->result.recipients;
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if (opd->result.unsupported_algorithm)
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free (opd->result.unsupported_algorithm);
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if (opd->result.file_name)
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free (opd->result.file_name);
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if (opd->result.session_key)
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free (opd->result.session_key);
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while (recipient)
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{
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gpgme_recipient_t next = recipient->next;
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free (recipient);
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recipient = next;
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}
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}
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gpgme_decrypt_result_t
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gpgme_op_decrypt_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_decrypt_result", ctx);
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err = _gpgme_op_data_lookup (ctx, OPDATA_DECRYPT, &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_recipient_t rcp;
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if (opd->result.unsupported_algorithm)
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{
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TRACE_LOG1 ("result: unsupported_algorithm: %s",
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opd->result.unsupported_algorithm);
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}
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if (opd->result.wrong_key_usage)
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{
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TRACE_LOG ("result: wrong key usage");
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}
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rcp = opd->result.recipients;
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while (rcp)
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{
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TRACE_LOG3 ("result: recipient: keyid=%s, pubkey_algo=%i, "
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"status=%s", rcp->keyid, rcp->pubkey_algo,
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gpg_strerror (rcp->status));
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rcp = rcp->next;
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}
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if (opd->result.file_name)
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{
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TRACE_LOG1 ("result: original file name: %s", opd->result.file_name);
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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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/* Parse the ARGS of an error status line and record some error
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* conditions at OPD. Returns 0 on success. */
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static gpgme_error_t
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parse_status_error (char *args, op_data_t opd)
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{
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gpgme_error_t err;
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char *field[3];
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int nfields;
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char *args2;
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if (!args)
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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args2 = strdup (args); /* Split modifies the input string. */
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nfields = _gpgme_split_fields (args2, field, DIM (field));
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if (nfields < 1)
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{
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free (args2);
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return trace_gpg_error (GPG_ERR_INV_ENGINE); /* Required arg missing. */
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}
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err = nfields < 2 ? 0 : atoi (field[1]);
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if (!strcmp (field[0], "decrypt.algorithm"))
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{
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if (gpg_err_code (err) == GPG_ERR_UNSUPPORTED_ALGORITHM
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&& nfields > 2
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&& strcmp (field[2], "?"))
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{
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opd->result.unsupported_algorithm = strdup (field[2]);
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if (!opd->result.unsupported_algorithm)
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{
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free (args2);
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return gpg_error_from_syserror ();
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}
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}
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}
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else if (!strcmp (field[0], "decrypt.keyusage"))
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{
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if (gpg_err_code (err) == GPG_ERR_WRONG_KEY_USAGE)
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opd->result.wrong_key_usage = 1;
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}
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else if (!strcmp (field[0], "pkdecrypt_failed"))
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{
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switch (gpg_err_code (err))
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{
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case GPG_ERR_CANCELED:
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case GPG_ERR_FULLY_CANCELED:
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/* It is better to return with a cancel error code than the
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* general decryption failed error code. */
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opd->pkdecrypt_failed = gpg_err_make (gpg_err_source (err),
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GPG_ERR_CANCELED);
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break;
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case GPG_ERR_BAD_PASSPHRASE:
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/* A bad passphrase is severe enough that we return this
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* error code. */
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opd->pkdecrypt_failed = err;
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break;
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default:
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/* For now all other error codes are ignored and the
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* standard DECRYPT_FAILED is returned. */
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break;
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}
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}
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free (args2);
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return 0;
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}
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static gpgme_error_t
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parse_enc_to (char *args, gpgme_recipient_t *recp, gpgme_protocol_t protocol)
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{
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gpgme_recipient_t rec;
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char *tail;
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int i;
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rec = malloc (sizeof (*rec));
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if (!rec)
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return gpg_error_from_syserror ();
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rec->next = NULL;
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rec->keyid = rec->_keyid;
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rec->status = 0;
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for (i = 0; i < sizeof (rec->_keyid) - 1; i++)
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{
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if (args[i] == '\0' || args[i] == ' ')
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break;
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rec->_keyid[i] = args[i];
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}
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rec->_keyid[i] = '\0';
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args = &args[i];
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if (*args != '\0' && *args != ' ')
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{
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free (rec);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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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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gpg_err_set_errno (0);
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rec->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 (rec);
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return trace_gpg_error (GPG_ERR_INV_ENGINE);
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}
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}
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d7e8d0 |
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/* FIXME: The key length is always 0 right now, so no need to parse
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it. */
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*recp = rec;
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return 0;
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}
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gpgme_error_t
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_gpgme_decrypt_status_handler (void *priv, gpgme_status_code_t code,
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char *args)
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{
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gpgme_ctx_t ctx = (gpgme_ctx_t) priv;
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d7e8d0 |
gpgme_error_t err;
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d7e8d0 |
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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d7e8d0 |
if (err)
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return err;
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d7e8d0 |
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d7e8d0 |
err = _gpgme_op_data_lookup (ctx, OPDATA_DECRYPT, &hook, -1, NULL);
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d7e8d0 |
opd = hook;
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d7e8d0 |
if (err)
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d7e8d0 |
return err;
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d7e8d0 |
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Packit |
d7e8d0 |
switch (code)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_FAILURE:
|
|
Packit |
d7e8d0 |
opd->failure_code = _gpgme_parse_failure (args);
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_EOF:
|
|
Packit |
d7e8d0 |
/* FIXME: These error values should probably be attributed to
|
|
Packit |
d7e8d0 |
the underlying crypto engine (as error source). */
|
|
Packit |
d7e8d0 |
if (opd->failed && opd->pkdecrypt_failed)
|
|
Packit |
d7e8d0 |
return opd->pkdecrypt_failed;
|
|
Packit |
d7e8d0 |
else if (opd->failed && opd->any_no_seckey)
|
|
Packit |
d7e8d0 |
return gpg_error (GPG_ERR_NO_SECKEY);
|
|
Packit |
d7e8d0 |
else if (opd->failed)
|
|
Packit |
d7e8d0 |
return gpg_error (GPG_ERR_DECRYPT_FAILED);
|
|
Packit |
d7e8d0 |
else if (!opd->okay)
|
|
Packit |
d7e8d0 |
return gpg_error (GPG_ERR_NO_DATA);
|
|
Packit |
d7e8d0 |
else if (opd->failure_code)
|
|
Packit |
d7e8d0 |
return opd->failure_code;
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_DECRYPTION_INFO:
|
|
Packit |
d7e8d0 |
/* Fixme: Provide a way to return the used symmetric algorithm. */
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_DECRYPTION_OKAY:
|
|
Packit |
d7e8d0 |
opd->okay = 1;
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_DECRYPTION_FAILED:
|
|
Packit |
d7e8d0 |
opd->failed = 1;
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_ERROR:
|
|
Packit |
d7e8d0 |
/* Note that this is an informational status code which should
|
|
Packit |
d7e8d0 |
not lead to an error return unless it is something not
|
|
Packit |
d7e8d0 |
related to the backend. */
|
|
Packit |
d7e8d0 |
err = parse_status_error (args, opd);
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_ENC_TO:
|
|
Packit |
d7e8d0 |
err = parse_enc_to (args, opd->last_recipient_p, ctx->protocol);
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
opd->last_recipient_p = &(*opd->last_recipient_p)->next;
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_SESSION_KEY:
|
|
Packit |
d7e8d0 |
if (opd->result.session_key)
|
|
Packit |
d7e8d0 |
free (opd->result.session_key);
|
|
Packit |
d7e8d0 |
opd->result.session_key = strdup(args);
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_NO_SECKEY:
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
gpgme_recipient_t rec = opd->result.recipients;
|
|
Packit |
d7e8d0 |
while (rec)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
if (!strcmp (rec->keyid, args))
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
rec->status = gpg_error (GPG_ERR_NO_SECKEY);
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
rec = rec->next;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
/* FIXME: Is this ok? */
|
|
Packit |
d7e8d0 |
if (!rec)
|
|
Packit |
d7e8d0 |
return trace_gpg_error (GPG_ERR_INV_ENGINE);
|
|
Packit |
d7e8d0 |
opd->any_no_seckey = 1;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_PLAINTEXT:
|
|
Packit |
d7e8d0 |
err = _gpgme_parse_plaintext (args, &opd->result.file_name);
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_INQUIRE_MAXLEN:
|
|
Packit |
d7e8d0 |
if (ctx->status_cb && !ctx->full_status)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
err = ctx->status_cb (ctx->status_cb_value, "INQUIRE_MAXLEN", args);
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
case GPGME_STATUS_DECRYPTION_COMPLIANCE_MODE:
|
|
Packit |
d7e8d0 |
PARSE_COMPLIANCE_FLAGS (args, &opd->result);
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
default:
|
|
Packit |
d7e8d0 |
break;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
return 0;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
static gpgme_error_t
|
|
Packit |
d7e8d0 |
decrypt_status_handler (void *priv, gpgme_status_code_t code, char *args)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
gpgme_error_t err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
err = _gpgme_progress_status_handler (priv, code, args);
|
|
Packit |
d7e8d0 |
if (!err)
|
|
Packit |
d7e8d0 |
err = _gpgme_decrypt_status_handler (priv, code, args);
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
gpgme_error_t
|
|
Packit |
d7e8d0 |
_gpgme_op_decrypt_init_result (gpgme_ctx_t ctx)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
gpgme_error_t err;
|
|
Packit |
d7e8d0 |
void *hook;
|
|
Packit |
d7e8d0 |
op_data_t opd;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
err = _gpgme_op_data_lookup (ctx, OPDATA_DECRYPT, &hook,
|
|
Packit |
d7e8d0 |
sizeof (*opd), release_op_data);
|
|
Packit |
d7e8d0 |
opd = hook;
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
opd->last_recipient_p = &opd->result.recipients;
|
|
Packit |
d7e8d0 |
return 0;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
gpgme_error_t
|
|
Packit |
d7e8d0 |
_gpgme_decrypt_start (gpgme_ctx_t ctx, int synchronous,
|
|
Packit |
d7e8d0 |
gpgme_decrypt_flags_t flags,
|
|
Packit |
d7e8d0 |
gpgme_data_t cipher, gpgme_data_t plain)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
gpgme_error_t err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
assert (!(flags & GPGME_DECRYPT_VERIFY));
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
err = _gpgme_op_reset (ctx, synchronous);
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
err = _gpgme_op_decrypt_init_result (ctx);
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
if (!cipher)
|
|
Packit |
d7e8d0 |
return gpg_error (GPG_ERR_NO_DATA);
|
|
Packit |
d7e8d0 |
if (!plain)
|
|
Packit |
d7e8d0 |
return gpg_error (GPG_ERR_INV_VALUE);
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
if (ctx->passphrase_cb)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
err = _gpgme_engine_set_command_handler
|
|
Packit |
d7e8d0 |
(ctx->engine, _gpgme_passphrase_command_handler, ctx, NULL);
|
|
Packit |
d7e8d0 |
if (err)
|
|
Packit |
d7e8d0 |
return err;
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
_gpgme_engine_set_status_handler (ctx->engine, decrypt_status_handler, ctx);
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
return _gpgme_engine_op_decrypt (ctx->engine,
|
|
Packit |
d7e8d0 |
flags,
|
|
Packit |
d7e8d0 |
cipher, plain,
|
|
Packit |
d7e8d0 |
ctx->export_session_keys,
|
|
Packit |
d7e8d0 |
ctx->override_session_key,
|
|
Packit |
d7e8d0 |
ctx->auto_key_retrieve);
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
gpgme_error_t
|
|
Packit |
d7e8d0 |
gpgme_op_decrypt_start (gpgme_ctx_t ctx, gpgme_data_t cipher,
|
|
Packit |
d7e8d0 |
gpgme_data_t plain)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
gpgme_error_t err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
TRACE_BEG2 (DEBUG_CTX, "gpgme_op_decrypt_start", ctx,
|
|
Packit |
d7e8d0 |
"cipher=%p, plain=%p", cipher, plain);
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
if (!ctx)
|
|
Packit |
d7e8d0 |
return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
err = _gpgme_decrypt_start (ctx, 0, 0, cipher, plain);
|
|
Packit |
d7e8d0 |
return TRACE_ERR (err);
|
|
Packit |
d7e8d0 |
}
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
/* Decrypt ciphertext CIPHER within CTX and store the resulting
|
|
Packit |
d7e8d0 |
plaintext in PLAIN. */
|
|
Packit |
d7e8d0 |
gpgme_error_t
|
|
Packit |
d7e8d0 |
gpgme_op_decrypt (gpgme_ctx_t ctx, gpgme_data_t cipher, gpgme_data_t plain)
|
|
Packit |
d7e8d0 |
{
|
|
Packit |
d7e8d0 |
gpgme_error_t err;
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
TRACE_BEG2 (DEBUG_CTX, "gpgme_op_decrypt", ctx,
|
|
Packit |
d7e8d0 |
"cipher=%p, plain=%p", cipher, plain);
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
if (!ctx)
|
|
Packit |
d7e8d0 |
return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
|
|
Packit |
d7e8d0 |
|
|
Packit |
d7e8d0 |
err = _gpgme_decrypt_start (ctx, 1, 0, cipher, plain);
|
|
Packit |
d7e8d0 |
if (!err)
|
|
Packit |
d7e8d0 |
err = _gpgme_wait_one (ctx);
|
|
Packit |
d7e8d0 |
return TRACE_ERR (err);
|
|
Packit |
d7e8d0 |
}
|