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![NIIBE Yutaka](/assets/img/avatar_default.png)
* tools/gpgparsemail.c (parse_message): Revert the change.
* tools/rfc822parse.c (transition_to_body): Set ERRNO.
(transition_to_header, insert_header): Likewise.
--
In the comment of rfc822parse_* functions, it explicitly explained
setting ERRNO on error. For parser errors, it may not have
appropriate ERRNO, in such a case, use ENOENT.
Fixes-commit: c13e459ffe
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
817 lines
22 KiB
C
817 lines
22 KiB
C
/* gpgparsemail.c - Standalone crypto mail parser
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* Copyright (C) 2004, 2007 Free Software Foundation, Inc.
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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 <https://www.gnu.org/licenses/>.
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*/
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/* This utility prints an RFC822, possible MIME structured, message
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in an annotated format with the first column having an indicator
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for the content of the line. Several options are available to
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scrutinize the message. S/MIME and OpenPGP support is included. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <time.h>
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#include <signal.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include "rfc822parse.h"
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#define PGM "gpgparsemail"
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/* Option flags. */
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static int verbose;
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static int debug;
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static int opt_crypto; /* Decrypt or verify messages. */
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static int opt_no_header; /* Don't output the header lines. */
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/* Structure used to communicate with the parser callback. */
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struct parse_info_s {
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int show_header; /* Show the header lines. */
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int show_data; /* Show the data lines. */
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unsigned int skip_show; /* Temporary disable above for these
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number of lines. */
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int show_data_as_note; /* The next data line should be shown
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as a note. */
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int show_boundary;
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int nesting_level;
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int is_pkcs7; /* Old style S/MIME message. */
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int smfm_state; /* State of PGP/MIME or S/MIME parsing. */
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int is_smime; /* This is S/MIME and not PGP/MIME. */
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const char *signing_protocol;
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const char *signing_protocol_2; /* there are two ways to present
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PKCS7 */
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int hashing_level; /* The nesting level we are hashing. */
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int hashing;
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FILE *hash_file;
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FILE *sig_file; /* Signature part with MIME or full
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pkcs7 data if IS_PCKS7 is set. */
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int verify_now; /* Flag set when all signature data is
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available. */
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};
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/* Print diagnostic message and exit with failure. */
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static void
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die (const char *format, ...)
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{
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va_list arg_ptr;
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fflush (stdout);
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fprintf (stderr, "%s: ", PGM);
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va_start (arg_ptr, format);
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vfprintf (stderr, format, arg_ptr);
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va_end (arg_ptr);
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putc ('\n', stderr);
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exit (1);
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}
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/* Print diagnostic message. */
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static void
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err (const char *format, ...)
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{
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va_list arg_ptr;
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fflush (stdout);
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fprintf (stderr, "%s: ", PGM);
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va_start (arg_ptr, format);
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vfprintf (stderr, format, arg_ptr);
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va_end (arg_ptr);
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putc ('\n', stderr);
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}
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static void *
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xmalloc (size_t n)
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{
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void *p = malloc (n);
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if (!p)
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die ("out of core: %s", strerror (errno));
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return p;
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}
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/* static void * */
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/* xcalloc (size_t n, size_t m) */
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/* { */
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/* void *p = calloc (n, m); */
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/* if (!p) */
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/* die ("out of core: %s", strerror (errno)); */
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/* return p; */
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/* } */
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/* static void * */
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/* xrealloc (void *old, size_t n) */
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/* { */
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/* void *p = realloc (old, n); */
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/* if (!p) */
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/* die ("out of core: %s", strerror (errno)); */
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/* return p; */
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/* } */
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/* static char * */
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/* xstrdup (const char *string) */
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/* { */
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/* void *p = malloc (strlen (string)+1); */
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/* if (!p) */
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/* die ("out of core: %s", strerror (errno)); */
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/* strcpy (p, string); */
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/* return p; */
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/* } */
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#ifndef HAVE_STPCPY
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static char *
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stpcpy (char *a,const char *b)
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{
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while (*b)
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*a++ = *b++;
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*a = 0;
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return (char*)a;
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}
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#endif
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static int
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run_gnupg (int smime, int sig_fd, int data_fd, int *close_list)
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{
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int rp[2];
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pid_t pid;
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int i, c, is_status;
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unsigned int pos;
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char status_buf[10];
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FILE *fp;
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if (pipe (rp) == -1)
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die ("error creating a pipe: %s", strerror (errno));
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pid = fork ();
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if (pid == -1)
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die ("error forking process: %s", strerror (errno));
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if (!pid)
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{ /* Child. */
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char data_fd_buf[50];
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int fd;
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/* Connect our signature fd to stdin. */
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if (sig_fd != 0)
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{
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if (dup2 (sig_fd, 0) == -1)
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die ("dup2 stdin failed: %s", strerror (errno));
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}
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/* Keep our data fd and format it for gpg/gpgsm use. */
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if (data_fd == -1)
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*data_fd_buf = 0;
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else
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sprintf (data_fd_buf, "-&%d", data_fd);
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/* Send stdout to the bit bucket. */
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fd = open ("/dev/null", O_WRONLY);
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if (fd == -1)
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die ("can't open '/dev/null': %s", strerror (errno));
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if (fd != 1)
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{
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if (dup2 (fd, 1) == -1)
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die ("dup2 stderr failed: %s", strerror (errno));
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}
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/* Connect stderr to our pipe. */
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if (rp[1] != 2)
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{
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if (dup2 (rp[1], 2) == -1)
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die ("dup2 stderr failed: %s", strerror (errno));
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}
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/* Close other files. */
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for (i=0; (fd=close_list[i]) != -1; i++)
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if (fd > 2 && fd != data_fd)
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close (fd);
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errno = 0;
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if (smime)
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execlp ("gpgsm", "gpgsm",
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"--enable-special-filenames",
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"--status-fd", "2",
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"--assume-base64",
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"--verify",
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"--",
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"-", data_fd == -1? NULL : data_fd_buf,
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NULL);
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else
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execlp ("gpg", "gpg",
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"--enable-special-filenames",
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"--status-fd", "2",
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"--verify",
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"--debug=512",
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"--",
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"-", data_fd == -1? NULL : data_fd_buf,
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NULL);
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die ("failed to exec the crypto command: %s", strerror (errno));
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}
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/* Parent. */
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close (rp[1]);
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fp = fdopen (rp[0], "r");
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if (!fp)
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die ("can't fdopen pipe for reading: %s", strerror (errno));
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pos = 0;
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is_status = 0;
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assert (sizeof status_buf > 9);
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while ((c=getc (fp)) != EOF)
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{
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if (pos < 9)
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status_buf[pos] = c;
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else
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{
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if (pos == 9)
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{
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is_status = !memcmp (status_buf, "[GNUPG:] ", 9);
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if (is_status)
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fputs ( "c ", stdout);
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else if (verbose)
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fputs ( "# ", stdout);
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fwrite (status_buf, 9, 1, stdout);
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}
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putchar (c);
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}
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if (c == '\n')
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{
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if (verbose && pos < 9)
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{
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fputs ( "# ", stdout);
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fwrite (status_buf, pos+1, 1, stdout);
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}
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pos = 0;
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}
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else
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pos++;
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}
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if (pos)
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{
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if (verbose && pos < 9)
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{
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fputs ( "# ", stdout);
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fwrite (status_buf, pos+1, 1, stdout);
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}
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putchar ('\n');
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}
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fclose (fp);
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while ( (i=waitpid (pid, NULL, 0)) == -1 && errno == EINTR)
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;
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if (i == -1)
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die ("waiting for child failed: %s", strerror (errno));
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return 0;
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}
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/* Verify the signature in the current temp files. */
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static void
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verify_signature (struct parse_info_s *info)
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{
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int close_list[10];
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if (info->is_pkcs7)
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{
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assert (!info->hash_file);
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assert (info->sig_file);
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rewind (info->sig_file);
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}
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else
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{
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assert (info->hash_file);
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assert (info->sig_file);
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rewind (info->hash_file);
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rewind (info->sig_file);
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}
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/* printf ("# Begin hashed data\n"); */
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/* while ( (c=getc (info->hash_file)) != EOF) */
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/* putchar (c); */
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/* printf ("# End hashed data signature\n"); */
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/* printf ("# Begin signature\n"); */
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/* while ( (c=getc (info->sig_file)) != EOF) */
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/* putchar (c); */
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/* printf ("# End signature\n"); */
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/* rewind (info->hash_file); */
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/* rewind (info->sig_file); */
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close_list[0] = -1;
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run_gnupg (info->is_smime, fileno (info->sig_file),
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info->hash_file ? fileno (info->hash_file) : -1, close_list);
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}
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/* Prepare for a multipart/signed.
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FIELD_CTX is the parsed context of the content-type header.*/
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static void
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mime_signed_begin (struct parse_info_s *info, rfc822parse_t msg,
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rfc822parse_field_t field_ctx)
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{
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const char *s;
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(void)msg;
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s = rfc822parse_query_parameter (field_ctx, "protocol", 1);
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if (s)
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{
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printf ("h signed.protocol: %s\n", s);
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if (!strcmp (s, "application/pgp-signature"))
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{
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if (info->smfm_state)
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err ("note: ignoring nested PGP/MIME or S/MIME signature");
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else
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{
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info->smfm_state = 1;
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info->is_smime = 0;
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info->signing_protocol = "application/pgp-signature";
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info->signing_protocol_2 = NULL;
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}
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}
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else if (!strcmp (s, "application/pkcs7-signature")
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|| !strcmp (s, "application/x-pkcs7-signature"))
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{
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if (info->smfm_state)
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err ("note: ignoring nested PGP/MIME or S/MIME signature");
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else
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{
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info->smfm_state = 1;
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info->is_smime = 1;
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info->signing_protocol = "application/pkcs7-signature";
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info->signing_protocol_2 = "application/x-pkcs7-signature";
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}
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}
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else if (verbose)
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printf ("# this protocol is not supported\n");
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}
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}
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/* Prepare for a multipart/encrypted.
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FIELD_CTX is the parsed context of the content-type header.*/
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static void
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mime_encrypted_begin (struct parse_info_s *info, rfc822parse_t msg,
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rfc822parse_field_t field_ctx)
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{
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const char *s;
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(void)info;
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(void)msg;
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s = rfc822parse_query_parameter (field_ctx, "protocol", 0);
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if (s)
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printf ("h encrypted.protocol: %s\n", s);
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}
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/* Prepare for old-style pkcs7 messages. */
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static void
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pkcs7_begin (struct parse_info_s *info, rfc822parse_t msg,
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rfc822parse_field_t field_ctx)
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{
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const char *s;
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(void)msg;
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s = rfc822parse_query_parameter (field_ctx, "name", 0);
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if (s)
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printf ("h pkcs7.name: %s\n", s);
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if (info->is_pkcs7)
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err ("note: ignoring nested pkcs7 data");
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else
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{
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info->is_pkcs7 = 1;
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if (opt_crypto)
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{
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assert (!info->sig_file);
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info->sig_file = tmpfile ();
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if (!info->sig_file)
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die ("error creating temp file: %s", strerror (errno));
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}
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}
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}
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/* Print the event received by the parser for debugging as comment
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line. */
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static void
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show_event (rfc822parse_event_t event)
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{
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const char *s;
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switch (event)
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{
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case RFC822PARSE_OPEN: s= "Open"; break;
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case RFC822PARSE_CLOSE: s= "Close"; break;
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case RFC822PARSE_CANCEL: s= "Cancel"; break;
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case RFC822PARSE_T2BODY: s= "T2Body"; break;
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case RFC822PARSE_FINISH: s= "Finish"; break;
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case RFC822PARSE_RCVD_SEEN: s= "Rcvd_Seen"; break;
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case RFC822PARSE_LEVEL_DOWN: s= "Level_Down"; break;
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case RFC822PARSE_LEVEL_UP: s= "Level_Up"; break;
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case RFC822PARSE_BOUNDARY: s= "Boundary"; break;
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case RFC822PARSE_LAST_BOUNDARY: s= "Last_Boundary"; break;
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case RFC822PARSE_BEGIN_HEADER: s= "Begin_Header"; break;
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case RFC822PARSE_PREAMBLE: s= "Preamble"; break;
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case RFC822PARSE_EPILOGUE: s= "Epilogue"; break;
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default: s= "[unknown event]"; break;
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}
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printf ("# *** got RFC822 event %s\n", s);
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}
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/* This function is called by the parser to communicate events. This
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callback comminucates with the main program using a structure
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passed in OPAQUE. Should return 0 or set errno and return -1. */
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static int
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message_cb (void *opaque, rfc822parse_event_t event, rfc822parse_t msg)
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{
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struct parse_info_s *info = opaque;
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if (debug)
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show_event (event);
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if (event == RFC822PARSE_BEGIN_HEADER || event == RFC822PARSE_T2BODY)
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{
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/* We need to check here whether to start collecting signed data
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because attachments might come without header lines and thus
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we won't see the BEGIN_HEADER event. */
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if (info->smfm_state == 1)
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{
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printf ("c begin_hash\n");
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info->hashing = 1;
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info->hashing_level = info->nesting_level;
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info->smfm_state++;
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if (opt_crypto)
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{
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assert (!info->hash_file);
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info->hash_file = tmpfile ();
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if (!info->hash_file)
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die ("failed to create temporary file: %s", strerror (errno));
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}
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}
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}
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if (event == RFC822PARSE_OPEN)
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{
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/* Initialize for a new message. */
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info->show_header = 1;
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}
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else if (event == RFC822PARSE_T2BODY)
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{
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rfc822parse_field_t ctx;
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ctx = rfc822parse_parse_field (msg, "Content-Type", -1);
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if (ctx)
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{
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const char *s1, *s2;
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s1 = rfc822parse_query_media_type (ctx, &s2);
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if (s1)
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{
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printf ("h media: %*s%s %s\n",
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info->nesting_level*2, "", s1, s2);
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if (info->smfm_state == 3)
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{
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char *buf = xmalloc (strlen (s1) + strlen (s2) + 2);
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strcpy (stpcpy (stpcpy (buf, s1), "/"), s2);
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assert (info->signing_protocol);
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if (strcmp (buf, info->signing_protocol) &&
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(!info->signing_protocol_2
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|| strcmp (buf,info->signing_protocol_2)))
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err ("invalid %s structure; expected %s%s%s, found '%s'",
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info->is_smime? "S/MIME":"PGP/MIME",
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info->signing_protocol,
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info->signing_protocol_2 ? " or " : "",
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info->signing_protocol_2 ? info->signing_protocol_2:"",
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|
buf);
|
|
else
|
|
{
|
|
printf ("c begin_signature\n");
|
|
info->smfm_state++;
|
|
if (opt_crypto)
|
|
{
|
|
assert (!info->sig_file);
|
|
info->sig_file = tmpfile ();
|
|
if (!info->sig_file)
|
|
die ("error creating temp file: %s",
|
|
strerror (errno));
|
|
}
|
|
}
|
|
free (buf);
|
|
}
|
|
else if (!strcmp (s1, "multipart"))
|
|
{
|
|
if (!strcmp (s2, "signed"))
|
|
mime_signed_begin (info, msg, ctx);
|
|
else if (!strcmp (s2, "encrypted"))
|
|
mime_encrypted_begin (info, msg, ctx);
|
|
}
|
|
else if (!strcmp (s1, "application")
|
|
&& (!strcmp (s2, "pkcs7-mime")
|
|
|| !strcmp (s2, "x-pkcs7-mime")))
|
|
pkcs7_begin (info, msg, ctx);
|
|
}
|
|
else
|
|
printf ("h media: %*s none\n", info->nesting_level*2, "");
|
|
|
|
rfc822parse_release_field (ctx);
|
|
}
|
|
else
|
|
printf ("h media: %*stext plain [assumed]\n",
|
|
info->nesting_level*2, "");
|
|
|
|
|
|
info->show_header = 0;
|
|
info->show_data = 1;
|
|
info->skip_show = 1;
|
|
}
|
|
else if (event == RFC822PARSE_PREAMBLE)
|
|
info->show_data_as_note = 1;
|
|
else if (event == RFC822PARSE_LEVEL_DOWN)
|
|
{
|
|
printf ("b down\n");
|
|
info->nesting_level++;
|
|
}
|
|
else if (event == RFC822PARSE_LEVEL_UP)
|
|
{
|
|
printf ("b up\n");
|
|
if (info->nesting_level)
|
|
info->nesting_level--;
|
|
else
|
|
err ("invalid structure (bad nesting level)");
|
|
}
|
|
else if (event == RFC822PARSE_BOUNDARY || event == RFC822PARSE_LAST_BOUNDARY)
|
|
{
|
|
info->show_data = 0;
|
|
info->show_boundary = 1;
|
|
if (event == RFC822PARSE_BOUNDARY)
|
|
{
|
|
info->show_header = 1;
|
|
info->skip_show = 1;
|
|
printf ("b part\n");
|
|
}
|
|
else
|
|
printf ("b last\n");
|
|
|
|
if (info->smfm_state == 2 && info->nesting_level == info->hashing_level)
|
|
{
|
|
printf ("c end_hash\n");
|
|
info->smfm_state++;
|
|
info->hashing = 0;
|
|
}
|
|
else if (info->smfm_state == 4)
|
|
{
|
|
printf ("c end_signature\n");
|
|
info->verify_now = 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Read a message from FP and process it according to the global
|
|
options. */
|
|
static void
|
|
parse_message (FILE *fp)
|
|
{
|
|
char line[5000];
|
|
size_t length;
|
|
rfc822parse_t msg;
|
|
unsigned int lineno = 0;
|
|
int no_cr_reported = 0;
|
|
struct parse_info_s info;
|
|
|
|
memset (&info, 0, sizeof info);
|
|
|
|
msg = rfc822parse_open (message_cb, &info);
|
|
if (!msg)
|
|
die ("can't open parser: %s", strerror (errno));
|
|
|
|
/* Fixme: We should not use fgets because it can't cope with
|
|
embedded nul characters. */
|
|
while (fgets (line, sizeof (line), fp))
|
|
{
|
|
lineno++;
|
|
if (lineno == 1 && !strncmp (line, "From ", 5))
|
|
continue; /* We better ignore a leading From line. */
|
|
|
|
length = strlen (line);
|
|
if (length && line[length - 1] == '\n')
|
|
line[--length] = 0;
|
|
else
|
|
err ("line number %u too long or last line not terminated", lineno);
|
|
if (length && line[length - 1] == '\r')
|
|
line[--length] = 0;
|
|
else if (verbose && !no_cr_reported)
|
|
{
|
|
err ("non canonical ended line detected (line %u)", lineno);
|
|
no_cr_reported = 1;
|
|
}
|
|
|
|
|
|
if (rfc822parse_insert (msg, line, length))
|
|
die ("parser failed: %s", strerror (errno));
|
|
|
|
if (info.hashing)
|
|
{
|
|
/* Delay hashing of the CR/LF because the last line ending
|
|
belongs to the next boundary. */
|
|
if (debug)
|
|
printf ("# hashing %s'%s'\n", info.hashing==2?"CR,LF+":"", line);
|
|
if (opt_crypto)
|
|
{
|
|
if (info.hashing == 2)
|
|
fputs ("\r\n", info.hash_file);
|
|
fputs (line, info.hash_file);
|
|
if (ferror (info.hash_file))
|
|
die ("error writing to temporary file: %s", strerror (errno));
|
|
}
|
|
|
|
info.hashing = 2;
|
|
}
|
|
|
|
if (info.sig_file && opt_crypto)
|
|
{
|
|
if (info.verify_now)
|
|
{
|
|
verify_signature (&info);
|
|
if (info.hash_file)
|
|
fclose (info.hash_file);
|
|
info.hash_file = NULL;
|
|
fclose (info.sig_file);
|
|
info.sig_file = NULL;
|
|
info.smfm_state = 0;
|
|
info.is_smime = 0;
|
|
info.is_pkcs7 = 0;
|
|
}
|
|
else
|
|
{
|
|
fputs (line, info.sig_file);
|
|
fputs ("\r\n", info.sig_file);
|
|
if (ferror (info.sig_file))
|
|
die ("error writing to temporary file: %s", strerror (errno));
|
|
}
|
|
}
|
|
|
|
if (info.show_boundary)
|
|
{
|
|
if (!opt_no_header)
|
|
printf (":%s\n", line);
|
|
info.show_boundary = 0;
|
|
}
|
|
|
|
if (info.skip_show)
|
|
info.skip_show--;
|
|
else if (info.show_data)
|
|
{
|
|
if (info.show_data_as_note)
|
|
{
|
|
if (verbose)
|
|
printf ("# DATA: %s\n", line);
|
|
info.show_data_as_note = 0;
|
|
}
|
|
else
|
|
printf (" %s\n", line);
|
|
}
|
|
else if (info.show_header && !opt_no_header)
|
|
printf (".%s\n", line);
|
|
|
|
}
|
|
|
|
if (info.sig_file && opt_crypto && info.is_pkcs7)
|
|
{
|
|
verify_signature (&info);
|
|
fclose (info.sig_file);
|
|
info.sig_file = NULL;
|
|
info.is_pkcs7 = 0;
|
|
}
|
|
|
|
rfc822parse_close (msg);
|
|
}
|
|
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
int last_argc = -1;
|
|
|
|
if (argc)
|
|
{
|
|
argc--; argv++;
|
|
}
|
|
while (argc && last_argc != argc )
|
|
{
|
|
last_argc = argc;
|
|
if (!strcmp (*argv, "--"))
|
|
{
|
|
argc--; argv++;
|
|
break;
|
|
}
|
|
else if (!strcmp (*argv, "--help"))
|
|
{
|
|
puts (
|
|
"Usage: " PGM " [OPTION] [FILE]\n"
|
|
"Parse a mail message into an annotated format.\n\n"
|
|
" --crypto decrypt or verify messages\n"
|
|
" --no-header don't output the header lines\n"
|
|
" --verbose enable extra informational output\n"
|
|
" --debug enable additional debug output\n"
|
|
" --help display this help and exit\n\n"
|
|
"With no FILE, or when FILE is -, read standard input.\n\n"
|
|
"WARNING: This tool is under development.\n"
|
|
" The semantics may change without notice\n\n"
|
|
"Report bugs to <bug-gnupg@gnu.org>.");
|
|
exit (0);
|
|
}
|
|
else if (!strcmp (*argv, "--verbose"))
|
|
{
|
|
verbose = 1;
|
|
argc--; argv++;
|
|
}
|
|
else if (!strcmp (*argv, "--debug"))
|
|
{
|
|
verbose = debug = 1;
|
|
argc--; argv++;
|
|
}
|
|
else if (!strcmp (*argv, "--crypto"))
|
|
{
|
|
opt_crypto = 1;
|
|
argc--; argv++;
|
|
}
|
|
else if (!strcmp (*argv, "--no-header"))
|
|
{
|
|
opt_no_header = 1;
|
|
argc--; argv++;
|
|
}
|
|
}
|
|
|
|
if (argc > 1)
|
|
die ("usage: " PGM " [OPTION] [FILE] (try --help for more information)\n");
|
|
|
|
signal (SIGPIPE, SIG_IGN);
|
|
|
|
if (argc && strcmp (*argv, "-"))
|
|
{
|
|
FILE *fp = fopen (*argv, "rb");
|
|
if (!fp)
|
|
die ("can't open '%s': %s", *argv, strerror (errno));
|
|
parse_message (fp);
|
|
fclose (fp);
|
|
}
|
|
else
|
|
parse_message (stdin);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
Local Variables:
|
|
compile-command: "gcc -Wall -Wno-pointer-sign -g -o gpgparsemail rfc822parse.c gpgparsemail.c"
|
|
End:
|
|
*/
|