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/*
* Copyright (C) 1996-7,2000 Michael R. Elkins <me@mutt.org>
* Copyright (C) 1998-2005 Thomas Roessler <roessler@does-not-exist.org>
* Copyright (C) 2004 g10 Code GmbH
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* This file contains all of the PGP routines necessary to sign, encrypt,
* verify and decrypt PGP messages in either the new PGP/MIME format, or
* in the older Application/Pgp format. It also contains some code to
* cache the user's passphrase for repeat use when decrypting or signing
* a message.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "mutt.h"
#include "mutt_curses.h"
#include "pgp.h"
#include "mime.h"
#include "copy.h"
#include <sys/wait.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
#include <ctype.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#ifdef CRYPT_BACKEND_CLASSIC_PGP
#include "mutt_crypt.h"
#include "mutt_menu.h"
char PgpPass[LONG_STRING];
time_t PgpExptime = 0; /* when does the cached passphrase expire? */
void pgp_void_passphrase (void)
{
memset (PgpPass, 0, sizeof (PgpPass));
PgpExptime = 0;
}
int pgp_valid_passphrase (void)
{
time_t now = time (NULL);
if (pgp_use_gpg_agent())
{
*PgpPass = 0;
return 1; /* handled by gpg-agent */
}
if (now < PgpExptime)
/* Use cached copy. */
return 1;
pgp_void_passphrase ();
if (mutt_get_password (_("Enter PGP passphrase:"), PgpPass, sizeof (PgpPass)) == 0)
{
PgpExptime = time (NULL) + PgpTimeout;
return (1);
}
else
PgpExptime = 0;
return 0;
}
void pgp_forget_passphrase (void)
{
pgp_void_passphrase ();
mutt_message _("PGP passphrase forgotten.");
}
int pgp_use_gpg_agent (void)
{
char *tty;
if (!option (OPTUSEGPGAGENT) || !getenv ("GPG_AGENT_INFO"))
return 0;
if ((tty = ttyname(0)))
setenv("GPG_TTY", tty, 0);
return 1;
}
char *pgp_keyid(pgp_key_t k)
{
if((k->flags & KEYFLAG_SUBKEY) && k->parent && option(OPTPGPIGNORESUB))
k = k->parent;
return _pgp_keyid(k);
}
char *_pgp_keyid(pgp_key_t k)
{
if(option(OPTPGPLONGIDS))
return k->keyid;
else
return (k->keyid + 8);
}
/* ----------------------------------------------------------------------------
* Routines for handing PGP input.
*/
/* Copy PGP output messages and look for signs of a good signature */
static int pgp_copy_checksig (FILE *fpin, FILE *fpout)
{
int rv = -1;
if (PgpGoodSign.pattern)
{
char *line = NULL;
int lineno = 0;
size_t linelen;
while ((line = mutt_read_line (line, &linelen, fpin, &lineno, 0)) != NULL)
{
if (regexec (PgpGoodSign.rx, line, 0, NULL, 0) == 0)
{
dprint (2, (debugfile, "pgp_copy_checksig: \"%s\" matches regexp.\n",
line));
rv = 0;
}
else
dprint (2, (debugfile, "pgp_copy_checksig: \"%s\" doesn't match regexp.\n",
line));
if (strncmp (line, "[GNUPG:] ", 9) == 0)
continue;
fputs (line, fpout);
fputc ('\n', fpout);
}
FREE (&line);
}
else
{
dprint (2, (debugfile, "pgp_copy_checksig: No pattern.\n"));
mutt_copy_stream (fpin, fpout);
rv = 1;
}
return rv;
}
/*
* Copy a clearsigned message, and strip the signature and PGP's
* dash-escaping.
*
* XXX - charset handling: We assume that it is safe to do
* character set decoding first, dash decoding second here, while
* we do it the other way around in the main handler.
*
* (Note that we aren't worse than Outlook &c in this, and also
* note that we can successfully handle anything produced by any
* existing versions of mutt.)
*/
static void pgp_copy_clearsigned (FILE *fpin, STATE *s, char *charset)
{
char buf[HUGE_STRING];
short complete, armor_header;
FGETCONV *fc;
rewind (fpin);
/* fromcode comes from the MIME Content-Type charset label. It might
* be a wrong label, so we want the ability to do corrections via
* charset-hooks. Therefore we set flags to M_ICONV_HOOK_FROM.
*/
fc = fgetconv_open (fpin, charset, Charset, M_ICONV_HOOK_FROM);
for (complete = 1, armor_header = 1;
fgetconvs (buf, sizeof (buf), fc) != NULL;
complete = strchr (buf, '\n') != NULL)
{
if (!complete)
{
if (!armor_header)
state_puts (buf, s);
continue;
}
if (mutt_strcmp (buf, "-----BEGIN PGP SIGNATURE-----\n") == 0)
break;
if (armor_header)
{
char *p = mutt_skip_whitespace (buf);
if (*p == '\0')
armor_header = 0;
continue;
}
if (s->prefix)
state_puts (s->prefix, s);
if (buf[0] == '-' && buf[1] == ' ')
state_puts (buf + 2, s);
else
state_puts (buf, s);
}
fgetconv_close (&fc);
}
/* Support for the Application/PGP Content Type. */
int pgp_application_pgp_handler (BODY *m, STATE *s)
{
int could_not_decrypt = 0;
int needpass = -1, pgp_keyblock = 0;
int clearsign = 0, rv, rc;
int c = 1; /* silence GCC warning */
long start_pos = 0;
long bytes;
LOFF_T last_pos, offset;
char buf[HUGE_STRING];
char outfile[_POSIX_PATH_MAX];
char tmpfname[_POSIX_PATH_MAX];
FILE *pgpout = NULL, *pgpin = NULL, *pgperr = NULL;
FILE *tmpfp = NULL;
pid_t thepid;
short maybe_goodsig = 1;
short have_any_sigs = 0;
char *gpgcharset = NULL;
char body_charset[STRING];
mutt_get_body_charset (body_charset, sizeof (body_charset), m);
rc = 0; /* silence false compiler warning if (s->flags & M_DISPLAY) */
fseeko (s->fpin, m->offset, 0);
last_pos = m->offset;
for (bytes = m->length; bytes > 0;)
{
if (fgets (buf, sizeof (buf), s->fpin) == NULL)
break;
offset = ftello (s->fpin);
bytes -= (offset - last_pos); /* don't rely on mutt_strlen(buf) */
last_pos = offset;
if (mutt_strncmp ("-----BEGIN PGP ", buf, 15) == 0)
{
clearsign = 0;
start_pos = last_pos;
if (mutt_strcmp ("MESSAGE-----\n", buf + 15) == 0)
needpass = 1;
else if (mutt_strcmp ("SIGNED MESSAGE-----\n", buf + 15) == 0)
{
clearsign = 1;
needpass = 0;
}
else if (!mutt_strcmp ("PUBLIC KEY BLOCK-----\n", buf + 15))
{
needpass = 0;
pgp_keyblock = 1;
}
else
{
/* XXX - we may wish to recode here */
if (s->prefix)
state_puts (s->prefix, s);
state_puts (buf, s);
continue;
}
have_any_sigs = have_any_sigs || (clearsign && (s->flags & M_VERIFY));
/* Copy PGP material to temporary file */
mutt_mktemp (tmpfname, sizeof (tmpfname));
if ((tmpfp = safe_fopen (tmpfname, "w+")) == NULL)
{
mutt_perror (tmpfname);
return -1;
}
fputs (buf, tmpfp);
while (bytes > 0 && fgets (buf, sizeof (buf) - 1, s->fpin) != NULL)
{
offset = ftello (s->fpin);
bytes -= (offset - last_pos); /* don't rely on mutt_strlen(buf) */
last_pos = offset;
fputs (buf, tmpfp);
if ((needpass && mutt_strcmp ("-----END PGP MESSAGE-----\n", buf) == 0) ||
(!needpass
&& (mutt_strcmp ("-----END PGP SIGNATURE-----\n", buf) == 0
|| mutt_strcmp ("-----END PGP PUBLIC KEY BLOCK-----\n",buf) == 0)))
break;
/* remember optional Charset: armor header as defined by RfC4880 */
if (mutt_strncmp ("Charset: ", buf, 9) == 0)
{
size_t l = 0;
gpgcharset = safe_strdup (buf + 9);
if ((l = mutt_strlen (gpgcharset)) > 0 && gpgcharset[l-1] == '\n')
gpgcharset[l-1] = 0;
if (mutt_check_charset (gpgcharset, 0) < 0)
mutt_str_replace (&gpgcharset, "UTF-8");
}
}
/* leave tmpfp open in case we still need it - but flush it! */
fflush (tmpfp);
/* Invoke PGP if needed */
if (!clearsign || (s->flags & M_VERIFY))
{
mutt_mktemp (outfile, sizeof (outfile));
if ((pgpout = safe_fopen (outfile, "w+")) == NULL)
{
mutt_perror (tmpfname);
return -1;
}
if ((thepid = pgp_invoke_decode (&pgpin, NULL, &pgperr, -1,
fileno (pgpout), -1, tmpfname,
needpass)) == -1)
{
safe_fclose (&pgpout);
maybe_goodsig = 0;
pgpin = NULL;
pgperr = NULL;
state_attach_puts (_("[-- Error: unable to create PGP subprocess! --]\n"), s);
}
else /* PGP started successfully */
{
if (needpass)
{
if (!pgp_valid_passphrase ()) pgp_void_passphrase();
if (pgp_use_gpg_agent())
*PgpPass = 0;
fprintf (pgpin, "%s\n", PgpPass);
}
safe_fclose (&pgpin);
if (s->flags & M_DISPLAY)
{
crypt_current_time (s, "PGP");
rc = pgp_copy_checksig (pgperr, s->fpout);
}
safe_fclose (&pgperr);
rv = mutt_wait_filter (thepid);
if (s->flags & M_DISPLAY)
{
if (rc == 0) have_any_sigs = 1;
/*
* Sig is bad if
* gpg_good_sign-pattern did not match || pgp_decode_command returned not 0
* Sig _is_ correct if
* gpg_good_sign="" && pgp_decode_command returned 0
*/
if (rc == -1 || rv) maybe_goodsig = 0;
state_attach_puts (_("[-- End of PGP output --]\n\n"), s);
}
if (pgp_use_gpg_agent())
mutt_need_hard_redraw ();
}
/* treat empty result as sign of failure */
/* TODO: maybe on failure mutt should include the original undecoded text. */
if (pgpout)
{
rewind (pgpout);
c = fgetc (pgpout);
ungetc (c, pgpout);
}
if (!clearsign && (!pgpout || c == EOF))
{
could_not_decrypt = 1;
pgp_void_passphrase ();
}
if (could_not_decrypt && !(s->flags & M_DISPLAY))
{
mutt_error _("Could not decrypt PGP message");
mutt_sleep (1);
rc = -1;
goto out;
}
}
/*
* Now, copy cleartext to the screen.
*/
if(s->flags & M_DISPLAY)
{
if (needpass)
state_attach_puts (_("[-- BEGIN PGP MESSAGE --]\n\n"), s);
else if (pgp_keyblock)
state_attach_puts (_("[-- BEGIN PGP PUBLIC KEY BLOCK --]\n"), s);
else
state_attach_puts (_("[-- BEGIN PGP SIGNED MESSAGE --]\n\n"), s);
}
if (clearsign)
{
rewind (tmpfp);
if (tmpfp)
pgp_copy_clearsigned (tmpfp, s, body_charset);
}
else if (pgpout)
{
FGETCONV *fc;
int c;
char *expected_charset = gpgcharset && *gpgcharset ? gpgcharset : "utf-8";
dprint(4,(debugfile,"pgp: recoding inline from [%s] to [%s]\n",
expected_charset, Charset));
rewind (pgpout);
state_set_prefix (s);
fc = fgetconv_open (pgpout, expected_charset, Charset, M_ICONV_HOOK_FROM);
while ((c = fgetconv (fc)) != EOF)
state_prefix_putc (c, s);
fgetconv_close (&fc);
}
if (s->flags & M_DISPLAY)
{
state_putc ('\n', s);
if (needpass)
{
state_attach_puts (_("[-- END PGP MESSAGE --]\n"), s);
if (could_not_decrypt)
mutt_error _("Could not decrypt PGP message");
else
mutt_message _("PGP message successfully decrypted.");
}
else if (pgp_keyblock)
state_attach_puts (_("[-- END PGP PUBLIC KEY BLOCK --]\n"), s);
else
state_attach_puts (_("[-- END PGP SIGNED MESSAGE --]\n"), s);
}
}
else
{
/* A traditional PGP part may mix signed and unsigned content */
/* XXX - we may wish to recode here */
if (s->prefix)
state_puts (s->prefix, s);
state_puts (buf, s);
}
}
rc = 0;
out:
m->goodsig = (maybe_goodsig && have_any_sigs);
if (tmpfp)
{
safe_fclose (&tmpfp);
mutt_unlink (tmpfname);
}
if (pgpout)
{
safe_fclose (&pgpout);
mutt_unlink (outfile);
}
FREE(&gpgcharset);
if (needpass == -1)
{
state_attach_puts (_("[-- Error: could not find beginning of PGP message! --]\n\n"), s);
return -1;
}
return rc;
}
static int pgp_check_traditional_one_body (FILE *fp, BODY *b, int tagged_only)
{
char tempfile[_POSIX_PATH_MAX];
char buf[HUGE_STRING];
FILE *tfp;
short sgn = 0;
short enc = 0;
short key = 0;
if (b->type != TYPETEXT)
return 0;
if (tagged_only && !b->tagged)
return 0;
mutt_mktemp (tempfile, sizeof (tempfile));
if (mutt_decode_save_attachment (fp, b, tempfile, 0, 0) != 0)
{
unlink (tempfile);
return 0;
}
if ((tfp = fopen (tempfile, "r")) == NULL)
{
unlink (tempfile);
return 0;
}
while (fgets (buf, sizeof (buf), tfp))
{
if (mutt_strncmp ("-----BEGIN PGP ", buf, 15) == 0)
{
if (mutt_strcmp ("MESSAGE-----\n", buf + 15) == 0)
enc = 1;
else if (mutt_strcmp ("SIGNED MESSAGE-----\n", buf + 15) == 0)
sgn = 1;
else if (mutt_strcmp ("PUBLIC KEY BLOCK-----\n", buf + 15) == 0)
key = 1;
}
}
safe_fclose (&tfp);
unlink (tempfile);
if (!enc && !sgn && !key)
return 0;
/* fix the content type */
mutt_set_parameter ("format", "fixed", &b->parameter);
if (enc)
mutt_set_parameter ("x-action", "pgp-encrypted", &b->parameter);
else if (sgn)
mutt_set_parameter ("x-action", "pgp-signed", &b->parameter);
else if (key)
mutt_set_parameter ("x-action", "pgp-keys", &b->parameter);
return 1;
}
int pgp_check_traditional (FILE *fp, BODY *b, int tagged_only)
{
int rv = 0;
int r;
for (; b; b = b->next)
{
if (is_multipart (b))
rv = pgp_check_traditional (fp, b->parts, tagged_only) || rv;
else if (b->type == TYPETEXT)
{
if ((r = mutt_is_application_pgp (b)))
rv = rv || r;
else
rv = pgp_check_traditional_one_body (fp, b, tagged_only) || rv;
}
}
return rv;
}
int pgp_verify_one (BODY *sigbdy, STATE *s, const char *tempfile)
{
char sigfile[_POSIX_PATH_MAX], pgperrfile[_POSIX_PATH_MAX];
FILE *fp, *pgpout, *pgperr;
pid_t thepid;
int badsig = -1;
int rv;
snprintf (sigfile, sizeof (sigfile), "%s.asc", tempfile);
if(!(fp = safe_fopen (sigfile, "w")))
{
mutt_perror(sigfile);
return -1;
}
fseeko (s->fpin, sigbdy->offset, 0);
mutt_copy_bytes (s->fpin, fp, sigbdy->length);
safe_fclose (&fp);
mutt_mktemp (pgperrfile, sizeof (pgperrfile));
if(!(pgperr = safe_fopen(pgperrfile, "w+")))
{
mutt_perror(pgperrfile);
unlink(sigfile);
return -1;
}
crypt_current_time (s, "PGP");
if((thepid = pgp_invoke_verify (NULL, &pgpout, NULL,
-1, -1, fileno(pgperr),
tempfile, sigfile)) != -1)
{
if (pgp_copy_checksig (pgpout, s->fpout) >= 0)
badsig = 0;
safe_fclose (&pgpout);
fflush (pgperr);
rewind (pgperr);
if (pgp_copy_checksig (pgperr, s->fpout) >= 0)
badsig = 0;
if ((rv = mutt_wait_filter (thepid)))
badsig = -1;
dprint (1, (debugfile, "pgp_verify_one: mutt_wait_filter returned %d.\n", rv));
}
safe_fclose (&pgperr);
state_attach_puts (_("[-- End of PGP output --]\n\n"), s);
mutt_unlink (sigfile);
mutt_unlink (pgperrfile);
dprint (1, (debugfile, "pgp_verify_one: returning %d.\n", badsig));
return badsig;
}
/* Extract pgp public keys from messages or attachments */
void pgp_extract_keys_from_messages (HEADER *h)
{
int i;
char tempfname[_POSIX_PATH_MAX];
FILE *fpout;
if (h)
{
mutt_parse_mime_message (Context, h);
if(h->security & PGPENCRYPT && !pgp_valid_passphrase ())
return;
}
mutt_mktemp (tempfname, sizeof (tempfname));
if (!(fpout = safe_fopen (tempfname, "w")))
{
mutt_perror (tempfname);
return;
}
set_option (OPTDONTHANDLEPGPKEYS);
if (!h)
{
for (i = 0; i < Context->vcount; i++)
{
if (Context->hdrs[Context->v2r[i]]->tagged)
{
mutt_parse_mime_message (Context, Context->hdrs[Context->v2r[i]]);
if (Context->hdrs[Context->v2r[i]]->security & PGPENCRYPT
&& !pgp_valid_passphrase())
{
safe_fclose (&fpout);
goto bailout;
}
mutt_copy_message (fpout, Context, Context->hdrs[Context->v2r[i]],
M_CM_DECODE|M_CM_CHARCONV, 0);
}
}
}
else
{
mutt_parse_mime_message (Context, h);
if (h->security & PGPENCRYPT && !pgp_valid_passphrase())
{
safe_fclose (&fpout);
goto bailout;
}
mutt_copy_message (fpout, Context, h, M_CM_DECODE|M_CM_CHARCONV, 0);
}
safe_fclose (&fpout);
mutt_endwin (NULL);
pgp_invoke_import (tempfname);
mutt_any_key_to_continue (NULL);
bailout:
mutt_unlink (tempfname);
unset_option (OPTDONTHANDLEPGPKEYS);
}
static void pgp_extract_keys_from_attachment (FILE *fp, BODY *top)
{
STATE s;
FILE *tempfp;
char tempfname[_POSIX_PATH_MAX];
mutt_mktemp (tempfname, sizeof (tempfname));
if (!(tempfp = safe_fopen (tempfname, "w")))
{
mutt_perror (tempfname);
return;
}
memset (&s, 0, sizeof (STATE));
s.fpin = fp;
s.fpout = tempfp;
mutt_body_handler (top, &s);
safe_fclose (&tempfp);
pgp_invoke_import (tempfname);
mutt_any_key_to_continue (NULL);
mutt_unlink (tempfname);
}
void pgp_extract_keys_from_attachment_list (FILE *fp, int tag, BODY *top)
{
if(!fp)
{
mutt_error _("Internal error. Inform <roessler@does-not-exist.org>.");
return;
}
mutt_endwin (NULL);
set_option(OPTDONTHANDLEPGPKEYS);
for(; top; top = top->next)
{
if(!tag || top->tagged)
pgp_extract_keys_from_attachment (fp, top);
if(!tag)
break;
}
unset_option(OPTDONTHANDLEPGPKEYS);
}
BODY *pgp_decrypt_part (BODY *a, STATE *s, FILE *fpout, BODY *p)
{
char buf[LONG_STRING];
FILE *pgpin, *pgpout, *pgperr, *pgptmp;
struct stat info;
BODY *tattach;
int len;
char pgperrfile[_POSIX_PATH_MAX];
char pgptmpfile[_POSIX_PATH_MAX];
pid_t thepid;
int rv;
mutt_mktemp (pgperrfile, sizeof (pgperrfile));
if ((pgperr = safe_fopen (pgperrfile, "w+")) == NULL)
{
mutt_perror (pgperrfile);
return NULL;
}
unlink (pgperrfile);
mutt_mktemp (pgptmpfile, sizeof (pgptmpfile));
if((pgptmp = safe_fopen (pgptmpfile, "w")) == NULL)
{
mutt_perror (pgptmpfile);
safe_fclose (&pgperr);
return NULL;
}
/* Position the stream at the beginning of the body, and send the data to
* the temporary file.
*/
fseeko (s->fpin, a->offset, 0);
mutt_copy_bytes (s->fpin, pgptmp, a->length);
safe_fclose (&pgptmp);
if ((thepid = pgp_invoke_decrypt (&pgpin, &pgpout, NULL, -1, -1,
fileno (pgperr), pgptmpfile)) == -1)
{
safe_fclose (&pgperr);
unlink (pgptmpfile);
if (s->flags & M_DISPLAY)
state_attach_puts (_("[-- Error: could not create a PGP subprocess! --]\n\n"), s);
return (NULL);
}
/* send the PGP passphrase to the subprocess. Never do this if the
agent is active, because this might lead to a passphrase send as
the message. */
if (!pgp_use_gpg_agent())
fputs (PgpPass, pgpin);
fputc ('\n', pgpin);
safe_fclose (&pgpin);
/* Read the output from PGP, and make sure to change CRLF to LF, otherwise
* read_mime_header has a hard time parsing the message.
*/
while (fgets (buf, sizeof (buf) - 1, pgpout) != NULL)
{
len = mutt_strlen (buf);
if (len > 1 && buf[len - 2] == '\r')
strcpy (buf + len - 2, "\n"); /* __STRCPY_CHECKED__ */
fputs (buf, fpout);
}
safe_fclose (&pgpout);
rv = mutt_wait_filter (thepid);
mutt_unlink(pgptmpfile);
if (s->flags & M_DISPLAY)
{
fflush (pgperr);
rewind (pgperr);
if (pgp_copy_checksig (pgperr, s->fpout) == 0 && !rv && p)
p->goodsig = 1;
else
p->goodsig = 0;
state_attach_puts (_("[-- End of PGP output --]\n\n"), s);
}
safe_fclose (&pgperr);
fflush (fpout);
rewind (fpout);
if (pgp_use_gpg_agent())
mutt_need_hard_redraw ();
if (fgetc (fpout) == EOF)
{
mutt_error _("Decryption failed");
pgp_void_passphrase ();
return NULL;
}
rewind (fpout);
if ((tattach = mutt_read_mime_header (fpout, 0)) != NULL)
{
/*
* Need to set the length of this body part.
*/
fstat (fileno (fpout), &info);
tattach->length = info.st_size - tattach->offset;
/* See if we need to recurse on this MIME part. */
mutt_parse_part (fpout, tattach);
}
return (tattach);
}
int pgp_decrypt_mime (FILE *fpin, FILE **fpout, BODY *b, BODY **cur)
{
char tempfile[_POSIX_PATH_MAX];
STATE s;
BODY *p = b;
if(!mutt_is_multipart_encrypted(b))
return -1;
if(!b->parts || !b->parts->next)
return -1;
b = b->parts->next;
memset (&s, 0, sizeof (s));
s.fpin = fpin;
mutt_mktemp (tempfile, sizeof (tempfile));
if ((*fpout = safe_fopen (tempfile, "w+")) == NULL)
{
mutt_perror (tempfile);
return (-1);
}
unlink (tempfile);
*cur = pgp_decrypt_part (b, &s, *fpout, p);
rewind (*fpout);
if (!*cur)
return -1;
return (0);
}
int pgp_encrypted_handler (BODY *a, STATE *s)
{
char tempfile[_POSIX_PATH_MAX];
FILE *fpout, *fpin;
BODY *tattach;
BODY *p = a;
int rc = 0;
a = a->parts;
if (!a || a->type != TYPEAPPLICATION || !a->subtype ||
ascii_strcasecmp ("pgp-encrypted", a->subtype) != 0 ||
!a->next || a->next->type != TYPEAPPLICATION || !a->next->subtype ||
ascii_strcasecmp ("octet-stream", a->next->subtype) != 0)
{
if (s->flags & M_DISPLAY)
state_attach_puts (_("[-- Error: malformed PGP/MIME message! --]\n\n"), s);
return -1;
}
/*
* Move forward to the application/pgp-encrypted body.
*/
a = a->next;
mutt_mktemp (tempfile, sizeof (tempfile));
if ((fpout = safe_fopen (tempfile, "w+")) == NULL)
{
if (s->flags & M_DISPLAY)
state_attach_puts (_("[-- Error: could not create temporary file! --]\n"), s);
return -1;
}
if (s->flags & M_DISPLAY) crypt_current_time (s, "PGP");
if ((tattach = pgp_decrypt_part (a, s, fpout, p)) != NULL)
{
if (s->flags & M_DISPLAY)
state_attach_puts (_("[-- The following data is PGP/MIME encrypted --]\n\n"), s);
fpin = s->fpin;
s->fpin = fpout;
rc = mutt_body_handler (tattach, s);
s->fpin = fpin;
/*
* if a multipart/signed is the _only_ sub-part of a
* multipart/encrypted, cache signature verification
* status.
*
*/
if (mutt_is_multipart_signed (tattach) && !tattach->next)
p->goodsig |= tattach->goodsig;
if (s->flags & M_DISPLAY)
{
state_puts ("\n", s);
state_attach_puts (_("[-- End of PGP/MIME encrypted data --]\n"), s);
}
mutt_free_body (&tattach);
/* clear 'Invoking...' message, since there's no error */
mutt_message _("PGP message successfully decrypted.");
}
else
{
mutt_error _("Could not decrypt PGP message");
/* void the passphrase, even if it's not necessarily the problem */
pgp_void_passphrase ();
rc = -1;
}
safe_fclose (&fpout);
mutt_unlink(tempfile);
return rc;
}
/* ----------------------------------------------------------------------------
* Routines for sending PGP/MIME messages.
*/
BODY *pgp_sign_message (BODY *a)
{
BODY *t;
char buffer[LONG_STRING];
char sigfile[_POSIX_PATH_MAX], signedfile[_POSIX_PATH_MAX];
FILE *pgpin, *pgpout, *pgperr, *fp, *sfp;
int err = 0;
int empty = 1;
pid_t thepid;
convert_to_7bit (a); /* Signed data _must_ be in 7-bit format. */
mutt_mktemp (sigfile, sizeof (sigfile));
if ((fp = safe_fopen (sigfile, "w")) == NULL)
{
return (NULL);
}
mutt_mktemp (signedfile, sizeof (signedfile));
if ((sfp = safe_fopen(signedfile, "w")) == NULL)
{
mutt_perror(signedfile);
safe_fclose (&fp);
unlink(sigfile);
return NULL;
}
mutt_write_mime_header (a, sfp);
fputc ('\n', sfp);
mutt_write_mime_body (a, sfp);
safe_fclose (&sfp);
if ((thepid = pgp_invoke_sign (&pgpin, &pgpout, &pgperr,
-1, -1, -1, signedfile)) == -1)
{
mutt_perror _("Can't open PGP subprocess!");
safe_fclose (&fp);
unlink(sigfile);
unlink(signedfile);
return NULL;
}
if (!pgp_use_gpg_agent())
fputs(PgpPass, pgpin);
fputc('\n', pgpin);
safe_fclose (&pgpin);
/*
* Read back the PGP signature. Also, change MESSAGE=>SIGNATURE as
* recommended for future releases of PGP.
*/
while (fgets (buffer, sizeof (buffer) - 1, pgpout) != NULL)
{
if (mutt_strcmp ("-----BEGIN PGP MESSAGE-----\n", buffer) == 0)
fputs ("-----BEGIN PGP SIGNATURE-----\n", fp);
else if (mutt_strcmp("-----END PGP MESSAGE-----\n", buffer) == 0)
fputs ("-----END PGP SIGNATURE-----\n", fp);
else
fputs (buffer, fp);
empty = 0; /* got some output, so we're ok */
}
/* check for errors from PGP */
err = 0;
while (fgets (buffer, sizeof (buffer) - 1, pgperr) != NULL)
{
err = 1;
fputs (buffer, stdout);
}
if(mutt_wait_filter (thepid) && option(OPTPGPCHECKEXIT))
empty=1;
safe_fclose (&pgperr);
safe_fclose (&pgpout);
unlink (signedfile);
if (fclose (fp) != 0)
{
mutt_perror ("fclose");
unlink (sigfile);
return (NULL);
}
if (err)
mutt_any_key_to_continue (NULL);
if (empty)
{
unlink (sigfile);
/* most likely error is a bad passphrase, so automatically forget it */
pgp_void_passphrase ();
return (NULL); /* fatal error while signing */
}
t = mutt_new_body ();
t->type = TYPEMULTIPART;
t->subtype = safe_strdup ("signed");
t->encoding = ENC7BIT;
t->use_disp = 0;
t->disposition = DISPINLINE;
mutt_generate_boundary (&t->parameter);
mutt_set_parameter ("protocol", "application/pgp-signature", &t->parameter);
mutt_set_parameter ("micalg", pgp_micalg (sigfile), &t->parameter);
t->parts = a;
a = t;
t->parts->next = mutt_new_body ();
t = t->parts->next;
t->type = TYPEAPPLICATION;
t->subtype = safe_strdup ("pgp-signature");
t->filename = safe_strdup (sigfile);
t->use_disp = 0;
t->disposition = DISPNONE;
t->encoding = ENC7BIT;
t->unlink = 1; /* ok to remove this file after sending. */
return (a);
}
static short is_numerical_keyid (const char *s)
{
/* or should we require the "0x"? */
if (strncmp (s, "0x", 2) == 0)
s += 2;
if (strlen (s) % 8)
return 0;
while (*s)
if (strchr ("0123456789ABCDEFabcdef", *s++) == NULL)
return 0;
return 1;
}
/* This routine attempts to find the keyids of the recipients of a message.
* It returns NULL if any of the keys can not be found.
*/
char *pgp_findKeys (ADDRESS *to, ADDRESS *cc, ADDRESS *bcc)
{
char *keyID, *keylist = NULL;
size_t keylist_size = 0;
size_t keylist_used = 0;
ADDRESS *tmp = NULL, *addr = NULL;
ADDRESS **last = &tmp;
ADDRESS *p, *q;
int i;
pgp_key_t k_info = NULL, key = NULL;
const char *fqdn = mutt_fqdn (1);
for (i = 0; i < 3; i++)
{
switch (i)
{
case 0: p = to; break;
case 1: p = cc; break;
case 2: p = bcc; break;
default: abort ();
}
*last = rfc822_cpy_adr (p, 0);
while (*last)
last = &((*last)->next);
}
if (fqdn)
rfc822_qualify (tmp, fqdn);
tmp = mutt_remove_duplicates (tmp);
for (p = tmp; p ; p = p->next)
{
char buf[LONG_STRING];
q = p;
k_info = NULL;
if ((keyID = mutt_crypt_hook (p)) != NULL)
{
int r;
snprintf (buf, sizeof (buf), _("Use keyID = \"%s\" for %s?"), keyID, p->mailbox);
if ((r = mutt_yesorno (buf, M_YES)) == M_YES)
{
if (is_numerical_keyid (keyID))
{
if (strncmp (keyID, "0x", 2) == 0)
keyID += 2;
goto bypass_selection; /* you don't see this. */
}
/* check for e-mail address */
if (strchr (keyID, '@') &&
(addr = rfc822_parse_adrlist (NULL, keyID)))
{
if (fqdn) rfc822_qualify (addr, fqdn);
q = addr;
}
else
k_info = pgp_getkeybystr (keyID, KEYFLAG_CANENCRYPT, PGP_PUBRING);
}
else if (r == -1)
{
FREE (&keylist);
rfc822_free_address (&tmp);
rfc822_free_address (&addr);
return NULL;
}
}
if (k_info == NULL)
pgp_invoke_getkeys (q);
if (k_info == NULL && (k_info = pgp_getkeybyaddr (q, KEYFLAG_CANENCRYPT, PGP_PUBRING)) == NULL)
{
snprintf (buf, sizeof (buf), _("Enter keyID for %s: "), q->mailbox);
if ((key = pgp_ask_for_key (buf, q->mailbox,
KEYFLAG_CANENCRYPT, PGP_PUBRING)) == NULL)
{
FREE (&keylist);
rfc822_free_address (&tmp);
rfc822_free_address (&addr);
return NULL;
}
}
else
key = k_info;
keyID = pgp_keyid (key);
bypass_selection:
keylist_size += mutt_strlen (keyID) + 4;
safe_realloc (&keylist, keylist_size);
sprintf (keylist + keylist_used, "%s0x%s", keylist_used ? " " : "", /* __SPRINTF_CHECKED__ */
keyID);
keylist_used = mutt_strlen (keylist);
pgp_free_key (&key);
rfc822_free_address (&addr);
}
rfc822_free_address (&tmp);
return (keylist);
}
/* Warning: "a" is no longer freed in this routine, you need
* to free it later. This is necessary for $fcc_attach. */
BODY *pgp_encrypt_message (BODY *a, char *keylist, int sign)
{
char buf[LONG_STRING];
char tempfile[_POSIX_PATH_MAX], pgperrfile[_POSIX_PATH_MAX];
char pgpinfile[_POSIX_PATH_MAX];
FILE *pgpin, *pgperr, *fpout, *fptmp;
BODY *t;
int err = 0;
int empty = 0;
pid_t thepid;
mutt_mktemp (tempfile, sizeof (tempfile));
if ((fpout = safe_fopen (tempfile, "w+")) == NULL)
{
mutt_perror (tempfile);
return (NULL);
}
mutt_mktemp (pgperrfile, sizeof (pgperrfile));
if ((pgperr = safe_fopen (pgperrfile, "w+")) == NULL)
{
mutt_perror (pgperrfile);
unlink(tempfile);
safe_fclose (&fpout);
return NULL;
}
unlink (pgperrfile);
mutt_mktemp (pgpinfile, sizeof (pgpinfile));
if((fptmp = safe_fopen(pgpinfile, "w")) == NULL)
{
mutt_perror(pgpinfile);
unlink(tempfile);
safe_fclose (&fpout);
safe_fclose (&pgperr);
return NULL;
}
if (sign)
convert_to_7bit (a);
mutt_write_mime_header (a, fptmp);
fputc ('\n', fptmp);
mutt_write_mime_body (a, fptmp);
safe_fclose (&fptmp);
if ((thepid = pgp_invoke_encrypt (&pgpin, NULL, NULL, -1,
fileno (fpout), fileno (pgperr),
pgpinfile, keylist, sign)) == -1)
{
safe_fclose (&pgperr);
unlink(pgpinfile);
return (NULL);
}
if (sign)
{
if (!pgp_use_gpg_agent())
fputs (PgpPass, pgpin);
fputc ('\n', pgpin);
}
safe_fclose (&pgpin);
if(mutt_wait_filter (thepid) && option(OPTPGPCHECKEXIT))
empty=1;
unlink(pgpinfile);
fflush (fpout);
rewind (fpout);
if(!empty)
empty = (fgetc (fpout) == EOF);
safe_fclose (&fpout);
fflush (pgperr);
rewind (pgperr);
while (fgets (buf, sizeof (buf) - 1, pgperr) != NULL)
{
err = 1;
fputs (buf, stdout);
}
safe_fclose (&pgperr);
/* pause if there is any error output from PGP */
if (err)
mutt_any_key_to_continue (NULL);
if (empty)
{
/* fatal error while trying to encrypt message */
if (sign)
pgp_void_passphrase (); /* just in case */
unlink (tempfile);
return (NULL);
}
t = mutt_new_body ();
t->type = TYPEMULTIPART;
t->subtype = safe_strdup ("encrypted");
t->encoding = ENC7BIT;
t->use_disp = 0;
t->disposition = DISPINLINE;
mutt_generate_boundary(&t->parameter);
mutt_set_parameter("protocol", "application/pgp-encrypted", &t->parameter);
t->parts = mutt_new_body ();
t->parts->type = TYPEAPPLICATION;
t->parts->subtype = safe_strdup ("pgp-encrypted");
t->parts->encoding = ENC7BIT;
t->parts->next = mutt_new_body ();
t->parts->next->type = TYPEAPPLICATION;
t->parts->next->subtype = safe_strdup ("octet-stream");
t->parts->next->encoding = ENC7BIT;
t->parts->next->filename = safe_strdup (tempfile);
t->parts->next->use_disp = 1;
t->parts->next->disposition = DISPATTACH;
t->parts->next->unlink = 1; /* delete after sending the message */
t->parts->next->d_filename = safe_strdup ("msg.asc"); /* non pgp/mime can save */
return (t);
}
BODY *pgp_traditional_encryptsign (BODY *a, int flags, char *keylist)
{
BODY *b;
char pgpoutfile[_POSIX_PATH_MAX];
char pgperrfile[_POSIX_PATH_MAX];
char pgpinfile[_POSIX_PATH_MAX];
char body_charset[STRING];
char *from_charset;
const char *send_charset;
FILE *pgpout = NULL, *pgperr = NULL, *pgpin = NULL;
FILE *fp;
int empty = 0;
int err;
char buff[STRING];
pid_t thepid;
if (a->type != TYPETEXT)
return NULL;
if (ascii_strcasecmp (a->subtype, "plain"))
return NULL;
if ((fp = fopen (a->filename, "r")) == NULL)
{
mutt_perror (a->filename);
return NULL;
}
mutt_mktemp (pgpinfile, sizeof (pgpinfile));
if ((pgpin = safe_fopen (pgpinfile, "w")) == NULL)
{
mutt_perror (pgpinfile);
safe_fclose (&fp);
return NULL;
}
/* The following code is really correct: If noconv is set,
* a's charset parameter contains the on-disk character set, and
* we have to convert from that to utf-8. If noconv is not set,
* we have to convert from $charset to utf-8.
*/
mutt_get_body_charset (body_charset, sizeof (body_charset), a);
if (a->noconv)
from_charset = body_charset;
else
from_charset = Charset;
if (!mutt_is_us_ascii (body_charset))
{
int c;
FGETCONV *fc;
if (flags & ENCRYPT)
send_charset = "us-ascii";
else
send_charset = "utf-8";
/* fromcode is assumed to be correct: we set flags to 0 */
fc = fgetconv_open (fp, from_charset, "utf-8", 0);
while ((c = fgetconv (fc)) != EOF)
fputc (c, pgpin);
fgetconv_close (&fc);
}
else
{
send_charset = "us-ascii";
mutt_copy_stream (fp, pgpin);
}
safe_fclose (&fp);
safe_fclose (&pgpin);
mutt_mktemp (pgpoutfile, sizeof (pgpoutfile));
mutt_mktemp (pgperrfile, sizeof (pgperrfile));
if ((pgpout = safe_fopen (pgpoutfile, "w+")) == NULL ||
(pgperr = safe_fopen (pgperrfile, "w+")) == NULL)
{
mutt_perror (pgpout ? pgperrfile : pgpoutfile);
unlink (pgpinfile);
if (pgpout)
{
safe_fclose (&pgpout);
unlink (pgpoutfile);
}
return NULL;
}
unlink (pgperrfile);
if ((thepid = pgp_invoke_traditional (&pgpin, NULL, NULL,
-1, fileno (pgpout), fileno (pgperr),
pgpinfile, keylist, flags)) == -1)
{
mutt_perror _("Can't invoke PGP");
safe_fclose (&pgpout);
safe_fclose (&pgperr);
mutt_unlink (pgpinfile);
unlink (pgpoutfile);
return NULL;
}
if (pgp_use_gpg_agent())
*PgpPass = 0;
if (flags & SIGN)
fprintf (pgpin, "%s\n", PgpPass);
safe_fclose (&pgpin);
if(mutt_wait_filter (thepid) && option(OPTPGPCHECKEXIT))
empty=1;
mutt_unlink (pgpinfile);
fflush (pgpout);
fflush (pgperr);
rewind (pgpout);
rewind (pgperr);
if(!empty)
empty = (fgetc (pgpout) == EOF);
safe_fclose (&pgpout);
err = 0;
while (fgets (buff, sizeof (buff), pgperr))
{
err = 1;
fputs (buff, stdout);
}
safe_fclose (&pgperr);
if (err)
mutt_any_key_to_continue (NULL);
if (empty)
{
if (flags & SIGN)
pgp_void_passphrase (); /* just in case */
unlink (pgpoutfile);
return NULL;
}
b = mutt_new_body ();
b->encoding = ENC7BIT;
b->type = TYPETEXT;
b->subtype = safe_strdup ("plain");
mutt_set_parameter ("x-action", flags & ENCRYPT ? "pgp-encrypted" : "pgp-signed",
&b->parameter);
mutt_set_parameter ("charset", send_charset, &b->parameter);
b->filename = safe_strdup (pgpoutfile);
#if 0
/* The following is intended to give a clue to some completely brain-dead
* "mail environments" which are typically used by large corporations.
*/
b->d_filename = safe_strdup ("msg.pgp");
b->use_disp = 1;
#endif
b->disposition = DISPNONE;
b->unlink = 1;
b->noconv = 1;
b->use_disp = 0;
if (!(flags & ENCRYPT))
b->encoding = a->encoding;
return b;
}
int pgp_send_menu (HEADER *msg, int *redraw)
{
int choice;
if (!(WithCrypto & APPLICATION_PGP))
return msg->security;
/* If autoinline and no crypto options set, then set inline. */
if (option (OPTPGPAUTOINLINE) &&
!((msg->security & APPLICATION_PGP) && (msg->security & (SIGN|ENCRYPT))))
msg->security |= INLINE;
/* When the message is not selected for signing or encryption, the toggle
* between PGP/MIME and Traditional doesn't make sense.
*/
if (msg->security & (ENCRYPT | SIGN))
{
char prompt[LONG_STRING];
snprintf (prompt, sizeof (prompt),
_("PGP (e)ncrypt, (s)ign, sign (a)s, (b)oth, %s format, or (c)lear? "),
(msg->security & INLINE) ? _("PGP/M(i)ME") : _("(i)nline"));
/* The keys accepted for this prompt *must* match the order in the second
* version in the else clause since the switch statement below depends on
* it. The 'i' key is appended in this version.
*/
choice = mutt_multi_choice (prompt, _("esabfci"));
}
else
{
/* The keys accepted *must* be a prefix of the accepted keys in the "if"
* clause above since the switch statement below depends on it.
*/
choice = mutt_multi_choice(_("PGP (e)ncrypt, (s)ign, sign (a)s, (b)oth, or (c)lear? "),
_("esabfc"));
}
switch (choice)
{
case 1: /* (e)ncrypt */
msg->security |= ENCRYPT;
msg->security &= ~SIGN;
break;
case 2: /* (s)ign */
msg->security |= SIGN;
msg->security &= ~ENCRYPT;
break;
case 3: /* sign (a)s */
{
pgp_key_t p;
char input_signas[SHORT_STRING];
unset_option(OPTPGPCHECKTRUST);
if ((p = pgp_ask_for_key (_("Sign as: "), NULL, 0, PGP_SECRING)))
{
snprintf (input_signas, sizeof (input_signas), "0x%s",
pgp_keyid (p));
mutt_str_replace (&PgpSignAs, input_signas);
pgp_free_key (&p);
msg->security |= SIGN;
crypt_pgp_void_passphrase (); /* probably need a different passphrase */
}
#if 0
else
{
msg->security &= ~SIGN;
}
#endif
*redraw = REDRAW_FULL;
} break;
case 4: /* (b)oth */
msg->security |= (ENCRYPT | SIGN);
break;
case 5: /* (f)orget it */
case 6: /* (c)lear */
msg->security = 0;
break;
case 7: /* toggle (i)nline */
msg->security ^= INLINE;
break;
}
if (msg->security)
{
if (! (msg->security & (ENCRYPT | SIGN)))
msg->security = 0;
else
msg->security |= APPLICATION_PGP;
}
return (msg->security);
}
#endif /* CRYPT_BACKEND_CLASSIC_PGP */