/*
* Copyright notice from original mutt:
* Copyright (C) 1996,1997 Michael R. Elkins <me@mutt.org>
* Copyright (C) 1998,1999 Thomas Roessler <roessler@does-not-exist.org>
* Copyright (C) 2004 g10 Code GmbH
*
* This file is part of mutt-ng, see http://www.muttng.org/.
* It's licensed under the GNU General Public License,
* please see the file GPL in the top level source directory.
*/
/*
* 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 "enter.h"
#include "ascii.h"
#include "handler.h"
#include "mutt_curses.h"
#include "pgp.h"
#include "mime.h"
#include "copy.h"
#include "attach.h"
#include "lib/mem.h"
#include "lib/intl.h"
#include "lib/str.h"
#include "lib/debug.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_field_unbuffered (_("Enter PGP passphrase:"), PgpPass,
sizeof (PgpPass), M_PASS) == 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)) != NULL) {
if (regexec (PgpGoodSign.rx, line, 0, NULL, 0) == 0) {
debug_print (2, ("\"%s\" matches regexp.\n", line));
rv = 0;
}
else
debug_print (2, ("\"%s\" doesn't match regexp.\n", line));
if (strncmp (line, "[GNUPG:] ", 9) == 0)
continue;
fputs (line, fpout);
fputc ('\n', fpout);
}
mem_free (&line);
}
else {
debug_print (2, ("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);
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 (str_cmp (buf, "-----BEGIN PGP SIGNATURE-----\n") == 0)
break;
if (armor_header) {
char *p = str_skip_initws (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 c = 1;
int clearsign = 0, rv, rc;
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 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 str_len(buf) */
last_pos = offset;
if (str_ncmp ("-----BEGIN PGP ", buf, 15) == 0) {
clearsign = 0;
start_pos = last_pos;
if (str_cmp ("MESSAGE-----\n", buf + 15) == 0)
needpass = 1;
else if (str_cmp ("SIGNED MESSAGE-----\n", buf + 15) == 0) {
clearsign = 1;
needpass = 0;
}
else if (!option (OPTDONTHANDLEPGPKEYS) &&
str_cmp ("PUBLIC KEY BLOCK-----\n", buf + 15) == 0) {
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);
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 str_len(buf) */
last_pos = offset;
fputs (buf, tmpfp);
if ((needpass
&& str_cmp ("-----END PGP MESSAGE-----\n", buf) == 0)
|| (!needpass
&& (str_cmp ("-----END PGP SIGNATURE-----\n", buf) == 0
|| str_cmp ("-----END PGP PUBLIC KEY BLOCK-----\n",
buf) == 0)))
break;
}
/* 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);
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);
}
}
/* 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. NOTE - we expect that PGP
* outputs utf-8 cleartext. This may not always be true, but it
* seems to be a reasonable guess.
*/
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;
rewind (pgpout);
state_set_prefix (s);
fc = fgetconv_open (pgpout, "utf-8", Charset, 0);
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 {
/* 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);
}
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);
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 (str_ncmp ("-----BEGIN PGP ", buf, 15) == 0) {
if (str_cmp ("MESSAGE-----\n", buf + 15) == 0)
enc = 1;
else if (str_cmp ("SIGNED MESSAGE-----\n", buf + 15) == 0)
sgn = 1;
else if (str_cmp ("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);
fclose (fp);
mutt_mktemp (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;
debug_print (1, ("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);
debug_print (1, ("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);
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 ()) {
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 ()) {
fclose (fpout);
goto bailout;
}
mutt_copy_message (fpout, Context, h, M_CM_DECODE | M_CM_CHARCONV, 0);
}
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);
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);
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);
if ((pgperr = safe_fopen (pgperrfile, "w+")) == NULL) {
mutt_perror (pgperrfile);
return NULL;
}
unlink (pgperrfile);
mutt_mktemp (pgptmpfile);
if ((pgptmp = safe_fopen (pgptmpfile, "w")) == NULL) {
mutt_perror (pgptmpfile);
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);
fclose (pgptmp);
if ((thepid = pgp_invoke_decrypt (&pgpin, &pgpout, NULL, -1, -1,
fileno (pgperr), pgptmpfile)) == -1) {
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);
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 = str_len (buf);
if (len > 1 && buf[len - 2] == '\r')
strcpy (buf + len - 2, "\n"); /* __STRCPY_CHECKED__ */
fputs (buf, fpout);
}
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);
}
fclose (pgperr);
fflush (fpout);
rewind (fpout);
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);
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);
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");
pgp_void_passphrase ();
rc = -1;
}
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);
if ((fp = safe_fopen (sigfile, "w")) == NULL) {
return (NULL);
}
mutt_mktemp (signedfile);
if ((sfp = safe_fopen (signedfile, "w")) == NULL) {
mutt_perror (signedfile);
fclose (fp);
unlink (sigfile);
return NULL;
}
mutt_write_mime_header (a, sfp);
fputc ('\n', sfp);
mutt_write_mime_body (a, sfp);
fclose (sfp);
if ((thepid = pgp_invoke_sign (&pgpin, &pgpout, &pgperr,
-1, -1, -1, signedfile)) == -1) {
mutt_perror (_("Can't open PGP subprocess!"));
fclose (fp);
unlink (sigfile);
unlink (signedfile);
return NULL;
}
if (!pgp_use_gpg_agent ())
fputs (PgpPass, pgpin);
fputc ('\n', pgpin);
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 (str_cmp ("-----BEGIN PGP MESSAGE-----\n", buffer) == 0)
fputs ("-----BEGIN PGP SIGNATURE-----\n", fp);
else if (str_cmp ("-----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;
fclose (pgperr);
fclose (pgpout);
unlink (signedfile);
if (fclose (fp) != 0) {
mutt_perror ("fclose");
unlink (sigfile);
return (NULL);
}
if (err) {
pgp_void_passphrase ();
mutt_any_key_to_continue (NULL);
}
if (empty) {
unlink (sigfile);
return (NULL); /* fatal error while signing */
}
t = mutt_new_body ();
t->type = TYPEMULTIPART;
t->subtype = str_dup ("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 = str_dup ("pgp-signature");
t->filename = str_dup (sigfile);
t->use_disp = 0;
t->disposition = DISPINLINE;
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 (str_len (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, *t;
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);
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 ((t = 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) {
mem_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) {
mem_free (&keylist);
rfc822_free_address (&tmp);
rfc822_free_address (&addr);
return NULL;
}
}
else
key = k_info;
keyID = pgp_keyid (key);
bypass_selection:
keylist_size += str_len (keyID) + 4;
mem_realloc (&keylist, keylist_size);
sprintf (keylist + keylist_used, "%s0x%s", keylist_used ? " " : "", /* __SPRINTF_CHECKED__ */
keyID);
keylist_used = str_len (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);
if ((fpout = safe_fopen (tempfile, "w+")) == NULL) {
mutt_perror (tempfile);
return (NULL);
}
mutt_mktemp (pgperrfile);
if ((pgperr = safe_fopen (pgperrfile, "w+")) == NULL) {
mutt_perror (pgperrfile);
unlink (tempfile);
fclose (fpout);
return NULL;
}
unlink (pgperrfile);
mutt_mktemp (pgpinfile);
if ((fptmp = safe_fopen (pgpinfile, "w")) == NULL) {
mutt_perror (pgpinfile);
unlink (tempfile);
fclose (fpout);
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);
fclose (fptmp);
if ((thepid = pgp_invoke_encrypt (&pgpin, NULL, NULL, -1,
fileno (fpout), fileno (pgperr),
pgpinfile, keylist, sign)) == -1) {
fclose (pgperr);
unlink (pgpinfile);
return (NULL);
}
if (sign) {
if (!pgp_use_gpg_agent ())
fputs (PgpPass, pgpin);
fputc ('\n', pgpin);
}
fclose (pgpin);
if (mutt_wait_filter (thepid) && option (OPTPGPCHECKEXIT))
empty = 1;
unlink (pgpinfile);
fflush (fpout);
rewind (fpout);
if (!empty)
empty = (fgetc (fpout) == EOF);
fclose (fpout);
fflush (pgperr);
rewind (pgperr);
while (fgets (buf, sizeof (buf) - 1, pgperr) != NULL) {
err = 1;
fputs (buf, stdout);
}
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 = str_dup ("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 = str_dup ("pgp-encrypted");
t->parts->encoding = ENC7BIT;
t->parts->next = mutt_new_body ();
t->parts->next->type = TYPEAPPLICATION;
t->parts->next->subtype = str_dup ("octet-stream");
t->parts->next->encoding = ENC7BIT;
t->parts->next->filename = str_dup (tempfile);
t->parts->next->use_disp = 1;
t->parts->next->disposition = DISPINLINE;
t->parts->next->unlink = 1; /* delete after sending the message */
t->parts->next->d_filename = str_dup ("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);
if ((pgpin = safe_fopen (pgpinfile, "w")) == NULL) {
mutt_perror (pgpinfile);
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";
fc = fgetconv_open (fp, from_charset, "utf-8", M_ICONV_HOOK_FROM);
while ((c = fgetconv (fc)) != EOF)
fputc (c, pgpin);
fgetconv_close (&fc);
}
else {
send_charset = "us-ascii";
mutt_copy_stream (fp, pgpin);
}
safe_fclose (&fp);
fclose (pgpin);
mutt_mktemp (pgpoutfile);
mutt_mktemp (pgperrfile);
if ((pgpout = safe_fopen (pgpoutfile, "w+")) == NULL ||
(pgperr = safe_fopen (pgperrfile, "w+")) == NULL) {
mutt_perror (pgpout ? pgperrfile : pgpoutfile);
unlink (pgpinfile);
if (pgpout) {
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"));
fclose (pgpout);
fclose (pgperr);
mutt_unlink (pgpinfile);
unlink (pgpoutfile);
return NULL;
}
if (pgp_use_gpg_agent ())
*PgpPass = 0;
if (flags & SIGN)
fprintf (pgpin, "%s\n", PgpPass);
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);
fclose (pgpout);
err = 0;
while (fgets (buff, sizeof (buff), pgperr)) {
err = 1;
fputs (buff, stdout);
}
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 = str_dup ("plain");
mutt_set_parameter ("x-action",
flags & ENCRYPT ? "pgp-encrypted" : "pgp-signed",
&b->parameter);
mutt_set_parameter ("charset", send_charset, &b->parameter);
b->filename = str_dup (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 = str_dup ("msg.pgp");
b->use_disp = 1;
#endif
b->disposition = DISPINLINE;
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)
{
pgp_key_t p;
char input_signas[SHORT_STRING];
char prompt[LONG_STRING];
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;
snprintf (prompt, sizeof (prompt),
_("PGP (e)ncrypt, (s)ign, sign (a)s, (b)oth, %s, or (c)lear? "),
(msg->security & INLINE) ? _("PGP/M(i)ME") : _("(i)nline"));
switch (mutt_multi_choice (prompt, _("esabifc"))) {
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 */
unset_option (OPTPGPCHECKTRUST);
if ((p =
pgp_ask_for_key (_("Sign as: "), NULL, KEYFLAG_CANSIGN,
PGP_PUBRING))) {
snprintf (input_signas, sizeof (input_signas), "0x%s", pgp_keyid (p));
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: /* (i)nline */
if ((msg->security & (ENCRYPT | SIGN)))
msg->security ^= INLINE;
else
msg->security &= ~INLINE;
break;
case 6: /* (f)orget it */
case 7: /* (c)lear */
msg->security = 0;
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 */
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