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-rw-r--r--g10/decrypt.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/g10/decrypt.c b/g10/decrypt.c
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--- /dev/null
+++ b/g10/decrypt.c
@@ -0,0 +1,282 @@
+/* decrypt.c - decrypt and verify data
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+ * 2007, 2009 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "gpg.h"
+#include "options.h"
+#include "packet.h"
+#include "../common/status.h"
+#include "../common/iobuf.h"
+#include "keydb.h"
+#include "../common/util.h"
+#include "main.h"
+#include "../common/status.h"
+#include "../common/i18n.h"
+
+/* Assume that the input is an encrypted message and decrypt
+ * (and if signed, verify the signature on) it.
+ * This command differs from the default operation, as it never
+ * writes to the filename which is included in the file and it
+ * rejects files which don't begin with an encrypted message.
+ */
+int
+decrypt_message (ctrl_t ctrl, const char *filename)
+{
+ IOBUF fp;
+ armor_filter_context_t *afx = NULL;
+ progress_filter_context_t *pfx;
+ int rc;
+
+ pfx = new_progress_context ();
+
+ /* Open the message file. */
+ fp = iobuf_open (filename);
+ if (fp && is_secured_file (iobuf_get_fd (fp)))
+ {
+ iobuf_close (fp);
+ fp = NULL;
+ gpg_err_set_errno (EPERM);
+ }
+ if ( !fp )
+ {
+ rc = gpg_error_from_syserror ();
+ log_error (_("can't open '%s': %s\n"), print_fname_stdin(filename),
+ gpg_strerror (rc));
+ release_progress_context (pfx);
+ return rc;
+ }
+
+ handle_progress (pfx, fp, filename);
+
+ if ( !opt.no_armor )
+ {
+ if ( use_armor_filter( fp ) )
+ {
+ afx = new_armor_context ();
+ push_armor_filter ( afx, fp );
+ }
+ }
+
+ if (!opt.outfile)
+ {
+ opt.outfile = "-";
+ opt.flags.dummy_outfile = 1;
+ }
+ else
+ opt.flags.dummy_outfile = 0;
+ rc = proc_encryption_packets (ctrl, NULL, fp );
+ if (opt.flags.dummy_outfile)
+ opt.outfile = NULL;
+
+ iobuf_close (fp);
+ release_armor_context (afx);
+ release_progress_context (pfx);
+ return rc;
+}
+
+
+/* Same as decrypt_message but takes a file descriptor for input and
+ output. */
+gpg_error_t
+decrypt_message_fd (ctrl_t ctrl, int input_fd, int output_fd)
+{
+#ifdef HAVE_W32_SYSTEM
+ /* No server mode yet. */
+ (void)ctrl;
+ (void)input_fd;
+ (void)output_fd;
+ return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
+#else
+ gpg_error_t err;
+ IOBUF fp;
+ armor_filter_context_t *afx = NULL;
+ progress_filter_context_t *pfx;
+
+ if (opt.outfp)
+ return gpg_error (GPG_ERR_BUG);
+
+ pfx = new_progress_context ();
+
+ /* Open the message file. */
+ fp = iobuf_fdopen_nc (FD2INT(input_fd), "rb");
+ if (fp && is_secured_file (iobuf_get_fd (fp)))
+ {
+ iobuf_close (fp);
+ fp = NULL;
+ gpg_err_set_errno (EPERM);
+ }
+ if (!fp)
+ {
+ char xname[64];
+
+ err = gpg_error_from_syserror ();
+ snprintf (xname, sizeof xname, "[fd %d]", input_fd);
+ log_error (_("can't open '%s': %s\n"), xname, gpg_strerror (err));
+ release_progress_context (pfx);
+ return err;
+ }
+
+#ifdef HAVE_W32CE_SYSTEM
+#warning Need to fix this if we want to use g13
+ opt.outfp = NULL;
+#else
+ opt.outfp = es_fdopen_nc (output_fd, "wb");
+#endif
+ if (!opt.outfp)
+ {
+ char xname[64];
+
+ err = gpg_error_from_syserror ();
+ snprintf (xname, sizeof xname, "[fd %d]", output_fd);
+ log_error (_("can't open '%s': %s\n"), xname, gpg_strerror (err));
+ iobuf_close (fp);
+ release_progress_context (pfx);
+ return err;
+ }
+
+ if (!opt.no_armor)
+ {
+ if (use_armor_filter (fp))
+ {
+ afx = new_armor_context ();
+ push_armor_filter ( afx, fp );
+ }
+ }
+
+ err = proc_encryption_packets (ctrl, NULL, fp );
+
+ iobuf_close (fp);
+ es_fclose (opt.outfp);
+ opt.outfp = NULL;
+ release_armor_context (afx);
+ release_progress_context (pfx);
+ return err;
+#endif
+}
+
+
+void
+decrypt_messages (ctrl_t ctrl, int nfiles, char *files[])
+{
+ IOBUF fp;
+ progress_filter_context_t *pfx;
+ char *p, *output = NULL;
+ int rc=0,use_stdin=0;
+ unsigned int lno=0;
+
+ if (opt.outfile)
+ {
+ log_error(_("--output doesn't work for this command\n"));
+ return;
+ }
+
+ pfx = new_progress_context ();
+
+ if(!nfiles)
+ use_stdin=1;
+
+ for(;;)
+ {
+ char line[2048];
+ char *filename=NULL;
+
+ if(use_stdin)
+ {
+ if(fgets(line, DIM(line), stdin))
+ {
+ lno++;
+ if (!*line || line[strlen(line)-1] != '\n')
+ log_error("input line %u too long or missing LF\n", lno);
+ else
+ {
+ line[strlen(line)-1] = '\0';
+ filename=line;
+ }
+ }
+ }
+ else
+ {
+ if(nfiles)
+ {
+ filename=*files;
+ nfiles--;
+ files++;
+ }
+ }
+
+ if(filename==NULL)
+ break;
+
+ print_file_status(STATUS_FILE_START, filename, 3);
+ output = make_outfile_name(filename);
+ if (!output)
+ goto next_file;
+ fp = iobuf_open(filename);
+ if (fp)
+ iobuf_ioctl (fp, IOBUF_IOCTL_NO_CACHE, 1, NULL);
+ if (fp && is_secured_file (iobuf_get_fd (fp)))
+ {
+ iobuf_close (fp);
+ fp = NULL;
+ gpg_err_set_errno (EPERM);
+ }
+ if (!fp)
+ {
+ log_error(_("can't open '%s'\n"), print_fname_stdin(filename));
+ goto next_file;
+ }
+
+ handle_progress (pfx, fp, filename);
+
+ if (!opt.no_armor)
+ {
+ if (use_armor_filter(fp))
+ {
+ armor_filter_context_t *afx = new_armor_context ();
+ rc = push_armor_filter (afx, fp);
+ if (rc)
+ log_error("failed to push armor filter");
+ release_armor_context (afx);
+ }
+ }
+ rc = proc_packets (ctrl,NULL, fp);
+ iobuf_close(fp);
+ if (rc)
+ log_error("%s: decryption failed: %s\n", print_fname_stdin(filename),
+ gpg_strerror (rc));
+ p = get_last_passphrase();
+ set_next_passphrase(p);
+ xfree (p);
+
+ next_file:
+ /* Note that we emit file_done even after an error. */
+ write_status( STATUS_FILE_DONE );
+ xfree(output);
+ reset_literals_seen();
+ }
+
+ set_next_passphrase(NULL);
+ release_progress_context (pfx);
+}
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