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-rw-r--r--mail/mail-crypto.c405
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diff --git a/mail/mail-crypto.c b/mail/mail-crypto.c
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+++ b/mail/mail-crypto.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+
+/*
+ * mail-crypto.h: OpenPGP en/decryption & signature code
+ *
+ * FIXME FIXME FIXME: This should be in its own library or component
+ */
+
+/*
+ * Authors:
+ * Nathan Thompson-Amato <ndt@jps.net>
+ * Dan Winship <danw@helixcode.com>
+ *
+ * Copyright 2000, Helix Code, Inc. (http://www.helixcode.com)
+ * Copyright 2000, Nathan Thompson-Amato
+ * Copyright 1999, 2000, Anthony Mulcahy
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include "config.h"
+
+#ifdef PGP_PROGRAM
+#include <stdlib.h>
+#include <string.h>
+#include <glib.h>
+#include <gnome.h>
+
+#include "mail.h"
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <signal.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <termios.h>
+#include <unistd.h>
+#include <signal.h>
+
+static int
+cleanup_child (pid_t child)
+{
+ int status;
+ pid_t wait_result;
+ sigset_t mask, omask;
+
+ /* PGP5 closes fds before exiting, meaning this might be called
+ * too early. So wait a bit for the result.
+ */
+ sigemptyset (&mask);
+ sigaddset (&mask, SIGALRM);
+ sigprocmask (SIG_BLOCK, &mask, &omask);
+ alarm (1);
+ wait_result = waitpid (child, &status, 0);
+ alarm (0);
+ sigprocmask (SIG_SETMASK, &omask, NULL);
+
+ if (wait_result == -1 && errno == EINTR) {
+ /* The child is hanging: send a friendly reminder. */
+ kill (child, SIGTERM);
+ sleep (1);
+ wait_result = waitpid (child, &status, WNOHANG);
+ if (wait_result == 0) {
+ /* Still hanging; use brute force. */
+ kill (child, SIGKILL);
+ sleep (1);
+ wait_result = waitpid (child, &status, WNOHANG);
+ }
+ }
+
+ if (wait_result != -1 && WIFEXITED (status))
+ return WEXITSTATUS (status);
+ else
+ return -1;
+}
+
+static void
+cleanup_before_exec (int fd)
+{
+ int maxfd, i;
+
+ maxfd = sysconf (_SC_OPEN_MAX);
+ if (maxfd < 0)
+ return;
+
+ /* Loop over all fds. */
+ for (i = 0; i < maxfd; i++) {
+ if ((STDIN_FILENO != i) &&
+ (STDOUT_FILENO != i) &&
+ (STDERR_FILENO != i) &&
+ (fd != i))
+ close (i);
+ }
+}
+
+static int
+crypto_exec_with_passwd (char *path, char *argv[], const char *input,
+ int passwd_fds[], const char *passphrase,
+ char **output, char **diagnostics)
+{
+ fd_set fdset, write_fdset;
+ int ip_fds[2], op_fds[2], diag_fds[2];
+ int select_result, read_len, write_len;
+ size_t tmp_len;
+ pid_t child;
+ char *buf, *diag_buf;
+ const char *passwd_next, *input_next;
+ size_t size, alloc_size, diag_size, diag_alloc_size;
+ gboolean eof_seen, diag_eof_seen, passwd_eof_seen, input_eof_seen;
+ size_t passwd_remaining, passwd_incr, input_remaining, input_incr;
+ struct timeval timeout;
+ long tmp;
+
+ if ((pipe (ip_fds) < 0 ) ||
+ (pipe (op_fds) < 0 ) ||
+ (pipe (diag_fds) < 0 )) {
+ *diagnostics = g_strdup_printf ("Couldn't create pipe to %s: "
+ "%s", PGP_PROGRAM,
+ g_strerror (errno));
+ return 0;
+ }
+
+ if (!(child = fork ())) {
+ /* In child */
+
+ if ((dup2 (ip_fds[0], STDIN_FILENO) < 0 ) ||
+ (dup2 (op_fds[1], STDOUT_FILENO) < 0 ) ||
+ (dup2 (diag_fds[1], STDERR_FILENO) < 0 )) {
+ _exit (255);
+ }
+
+ /* Dissociate from evolution-mail's controlling
+ * terminal so that pgp/gpg won't be able to read from
+ * it: PGP 2 will fall back to asking for the password
+ * on /dev/tty if the passed-in password is incorrect.
+ * This will make that fail rather than hanging.
+ */
+ setsid ();
+
+ /* Close excess fds */
+ cleanup_before_exec(passwd_fds[0]);
+
+ execvp (path, argv);
+ fprintf (stderr, "Could not execute %s: %s\n", argv[0],
+ g_strerror (errno));
+ _exit (255);
+ } else if (child < 0) {
+ *diagnostics = g_strdup_printf ("Cannot fork %s: %s",
+ argv[0], g_strerror (errno));
+ return 0;
+ }
+
+ /* Parent */
+ close (ip_fds[0]);
+ close (op_fds[1]);
+ close (diag_fds[1]);
+ close (passwd_fds[0]);
+
+ timeout.tv_sec = 10; /* timeout in seconds */
+ timeout.tv_usec = 0;
+
+ size = diag_size = 0;
+ alloc_size = 4096;
+ diag_alloc_size = 1024;
+ eof_seen = diag_eof_seen = FALSE;
+
+ buf = g_malloc (alloc_size);
+ diag_buf = g_malloc (diag_alloc_size);
+
+ passwd_next = passphrase;
+ passwd_remaining = strlen (passphrase);
+ passwd_incr = fpathconf (passwd_fds[1], _PC_PIPE_BUF);
+ /* Use a reasonable default value on error. */
+ if (passwd_incr <= 0)
+ passwd_incr = 1024;
+ passwd_eof_seen = FALSE;
+
+ input_next = input;
+ input_remaining = strlen (input);
+ input_incr = fpathconf (ip_fds[1], _PC_PIPE_BUF);
+ if (input_incr <= 0)
+ input_incr = 1024;
+ input_eof_seen = FALSE;
+
+ while (!(eof_seen && diag_eof_seen)) {
+ FD_ZERO (&fdset);
+ if (!eof_seen)
+ FD_SET (op_fds[0], &fdset);
+ if (!diag_eof_seen)
+ FD_SET (diag_fds[0], &fdset);
+
+ FD_ZERO (&write_fdset);
+ if (!passwd_eof_seen)
+ FD_SET (passwd_fds[1], &write_fdset);
+ if (!input_eof_seen)
+ FD_SET (ip_fds[1], &write_fdset);
+
+ select_result = select (FD_SETSIZE, &fdset, &write_fdset,
+ NULL, &timeout);
+ if (select_result < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
+ }
+ if (select_result == 0) {
+ /* timeout */
+ break;
+ }
+
+ if (FD_ISSET (op_fds[0], &fdset)) {
+ /* More output is available. */
+
+ if (size + 4096 > alloc_size) {
+ alloc_size += 4096;
+ buf = g_realloc (buf , alloc_size);
+ }
+ read_len = read (op_fds[0], &buf[size],
+ alloc_size - size - 1);
+ if (read_len < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
+ }
+ if (read_len == 0)
+ eof_seen = TRUE;
+ size += read_len;
+ }
+
+ if (FD_ISSET(diag_fds[0], &fdset) ) {
+ /* More stderr is available. */
+
+ if (diag_size + 1024 > diag_alloc_size) {
+ diag_alloc_size += 1024;
+ diag_buf = g_realloc (diag_buf,
+ diag_alloc_size);
+ }
+
+ read_len = read (diag_fds[0], &diag_buf[diag_size],
+ diag_alloc_size - diag_size - 1);
+ if (read_len < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
+ }
+ if (read_len == 0)
+ diag_eof_seen = TRUE;
+ diag_size += read_len;
+ }
+
+ if (FD_ISSET(passwd_fds[1], &write_fdset)) {
+ /* Ready for more password input. */
+
+ tmp_len = passwd_incr;
+ if (tmp_len > passwd_remaining)
+ tmp_len = passwd_remaining;
+ write_len = write (passwd_fds[1], passwd_next,
+ tmp_len);
+ if (write_len < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
+ }
+ passwd_next += write_len;
+ passwd_remaining -= write_len;
+ if (passwd_remaining == 0) {
+ close (passwd_fds[1]);
+ passwd_eof_seen = TRUE;
+ }
+ }
+
+ if (FD_ISSET(ip_fds[1], &write_fdset)) {
+ /* Ready for more ciphertext input. */
+
+ tmp_len = input_incr;
+ if (tmp_len > input_remaining)
+ tmp_len = input_remaining;
+ write_len = write (ip_fds[1], input_next, tmp_len);
+ if (write_len < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
+ }
+ input_next += write_len;
+ input_remaining -= write_len;
+ if (input_remaining == 0 ) {
+ close (ip_fds[1]);
+ input_eof_seen = TRUE;
+ }
+ }
+ }
+
+ buf[size] = 0;
+ diag_buf[diag_size] = 0;
+ close (op_fds[0]);
+ close (diag_fds[0]);
+
+ *output = buf;
+ *diagnostics = diag_buf;
+
+ return cleanup_child (child);
+}
+
+/*----------------------------------------------------------------------*
+ * Public crypto functions
+ *----------------------------------------------------------------------*/
+
+
+char *
+mail_crypto_openpgp_decrypt (const char *ciphertext, const char *passphrase,
+ CamelException *ex)
+{
+ int retval;
+ char *path, *argv[12];
+ int i;
+ char *plaintext = NULL;
+ char *diagnostics = NULL;
+ int passwd_fds[2];
+ char passwd_fd[32];
+
+#ifndef PGP_PROGRAM
+ camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+ "No GPG/PGP program available.");
+ return NULL;
+#endif
+
+ if (pipe (passwd_fds) < 0) {
+ camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+ _("Couldn't create pipe to GPG/PGP: %s"),
+ g_strerror (errno));
+ return NULL;
+ }
+
+ i = 0;
+#if defined(GPG_PATH)
+ path = GPG_PATH;
+
+ argv[i++] = "gpg";
+ argv[i++] = "--verbose";
+ argv[i++] = "--yes";
+ argv[i++] = "--batch";
+
+ argv[i++] = "--output";
+ argv[i++] = "-"; /* output to stdout */
+
+ argv[i++] = "--decrypt";
+
+ argv[i++] = "--passphrase-fd";
+ sprintf (passwd_fd, "%d", passwd_fds[0]);
+ argv[i++] = passwd_fd;
+#elif defined(PGP5_PATH)
+ path = PGP5_PATH;
+
+ argv[i++] = "pgpv";
+ argv[i++] = "-f";
+ argv[i++] = "+batchmode=1";
+
+ sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+ putenv (passwd_fd);
+#else
+ path = PGP_PATH;
+
+ argv[i++] = "pgp";
+ argv[i++] = "-f";
+
+ sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+ putenv (passwd_fd);
+#endif
+ argv[i++] = NULL;
+
+ retval = crypto_exec_with_passwd (path, argv, ciphertext, passwd_fds,
+ passphrase, &plaintext,
+ &diagnostics);
+ if (retval != 0 || !*plaintext) {
+ camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+ "%s", diagnostics);
+ g_free (plaintext);
+ g_free (diagnostics);
+ return NULL;
+ }
+
+ g_free (diagnostics);
+ return plaintext;
+}
+
+#endif /* PGP_PROGRAM */
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