/*
* Copyright (C) 1996-1997 Michael R. Elkins <me@mutt.org>
* Copyright (C) 1999-2000,2002-2004,2006 Thomas Roessler <roessler@does-not-exist.org>
* Copyright (C) 2001 Thomas Roessler <roessler@does-not-exist.org>
* Oliver Ehli <elmy@acm.org>
* Copyright (C) 2003 Werner Koch <wk@gnupg.org>
* Copyright (C) 2004 g10code 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.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "mutt.h"
#include "mutt_curses.h"
#include "mime.h"
#include "copy.h"
#include "mutt_crypt.h"
#include "mutt_idna.h"
#ifdef USE_AUTOCRYPT
#include "autocrypt.h"
#endif
#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
/* print the current time to avoid spoofing of the signature output */
void crypt_current_time(STATE *s, char *app_name)
{
time_t t;
char p[STRING], tmp[STRING];
if (!WithCrypto)
return;
if (option (OPTCRYPTTIMESTAMP))
{
t = time(NULL);
strftime (p, sizeof (p), _(" (current time: %c)"), localtime (&t));
}
else
*p = '\0';
snprintf (tmp, sizeof (tmp), _("[-- %s output follows%s --]\n"), NONULL(app_name), p);
state_attach_puts (tmp, s);
}
void crypt_forget_passphrase (void)
{
if ((WithCrypto & APPLICATION_PGP))
crypt_pgp_void_passphrase ();
if ((WithCrypto & APPLICATION_SMIME))
crypt_smime_void_passphrase ();
if (WithCrypto)
mutt_message _("Passphrase(s) forgotten.");
}
#if defined(HAVE_SETRLIMIT) && (!defined(DEBUG))
static void disable_coredumps (void)
{
struct rlimit rl = {0, 0};
static short done = 0;
if (!done)
{
setrlimit (RLIMIT_CORE, &rl);
done = 1;
}
}
#endif /* HAVE_SETRLIMIT */
int crypt_valid_passphrase(int flags)
{
int ret = 0;
# if defined(HAVE_SETRLIMIT) &&(!defined(DEBUG))
disable_coredumps ();
# endif
if ((WithCrypto & APPLICATION_PGP) && (flags & APPLICATION_PGP))
ret = crypt_pgp_valid_passphrase ();
if ((WithCrypto & APPLICATION_SMIME) && (flags & APPLICATION_SMIME))
ret = crypt_smime_valid_passphrase ();
return ret;
}
/* In postpone mode, signing is automatically disabled. */
int mutt_protect (SEND_CONTEXT *sctx, char *keylist, int postpone)
{
HEADER *msg;
BODY *pbody = NULL, *tmp_pbody = NULL;
BODY *tmp_smime_pbody = NULL;
BODY *tmp_pgp_pbody = NULL;
ENVELOPE *protected_headers = NULL;
int security, sign, has_retainable_sig = 0;
int i, rc = -1;
char *orig_pgp_sign_as = NULL,
*orig_smime_sign_as = NULL,
*orig_smime_crypt_alg = NULL;
if (!WithCrypto)
return -1;
msg = sctx->msg;
security = msg->security;
sign = security & (AUTOCRYPT | SIGN);
if (postpone)
{
sign = 0;
security &= ~SIGN;
}
if (!(security & (ENCRYPT | AUTOCRYPT)) && !sign)
return 0;
if (sign &&
!(security & AUTOCRYPT) &&
!crypt_valid_passphrase (security))
return (-1);
/* Override with sctx settings, if they are set.
* This can happen with the compose send_menus and when resuming a
* postponed message.
*/
if (sctx->pgp_sign_as)
{
orig_pgp_sign_as = safe_strdup (PgpSignAs);
mutt_str_replace (&PgpSignAs, sctx->pgp_sign_as);
}
if (sctx->smime_sign_as)
{
orig_smime_sign_as = safe_strdup (SmimeSignAs);
mutt_str_replace (&SmimeSignAs, sctx->smime_sign_as);
}
if (sctx->smime_crypt_alg || sctx->smime_crypt_alg_cleared)
{
orig_smime_crypt_alg = safe_strdup (SmimeCryptAlg);
mutt_str_replace (&SmimeCryptAlg, sctx->smime_crypt_alg);
}
if ((WithCrypto & APPLICATION_PGP) &&
!(security & AUTOCRYPT) &&
((security & PGPINLINE) == PGPINLINE))
{
if ((msg->content->type != TYPETEXT) ||
ascii_strcasecmp (msg->content->subtype, "plain"))
{
if ((i = query_quadoption (OPT_PGPMIMEAUTO,
_("Inline PGP can't be used with attachments. Revert to PGP/MIME?"))) != MUTT_YES)
{
mutt_error _("Mail not sent: inline PGP can't be used with attachments.");
goto cleanup;
}
}
else if (!mutt_strcasecmp ("flowed",
mutt_get_parameter ("format", msg->content->parameter)))
{
if ((i = query_quadoption (OPT_PGPMIMEAUTO,
_("Inline PGP can't be used with format=flowed. Revert to PGP/MIME?"))) != MUTT_YES)
{
mutt_error _("Mail not sent: inline PGP can't be used with format=flowed.");
goto cleanup;
}
}
else
{
/* they really want to send it inline... go for it */
if (!isendwin ()) mutt_endwin _("Invoking PGP...");
pbody = crypt_pgp_traditional_encryptsign (msg->content, security, keylist);
if (pbody)
{
msg->content = pbody;
rc = 0;
goto cleanup;
}
/* otherwise inline won't work...ask for revert */
if ((i = query_quadoption (OPT_PGPMIMEAUTO, _("Message can't be sent inline. Revert to using PGP/MIME?"))) != MUTT_YES)
{
mutt_error _("Mail not sent.");
goto cleanup;
}
}
/* go ahead with PGP/MIME */
}
if (!isendwin ()) mutt_endwin (NULL);
if ((WithCrypto & APPLICATION_SMIME))
tmp_smime_pbody = msg->content;
if ((WithCrypto & APPLICATION_PGP))
tmp_pgp_pbody = msg->content;
if (option (OPTCRYPTUSEPKA) && sign)
{
/* Set sender (necessary for e.g. PKA). */
if ((WithCrypto & APPLICATION_SMIME)
&& (security & APPLICATION_SMIME))
crypt_smime_set_sender (msg->env->from->mailbox);
else if ((WithCrypto & APPLICATION_PGP)
&& (security & APPLICATION_PGP))
crypt_pgp_set_sender (msg->env->from->mailbox);
}
if (option (OPTCRYPTPROTHDRSWRITE))
{
BUFFER *date = NULL;
protected_headers = mutt_new_envelope ();
protected_headers->subject = safe_strdup (msg->env->subject);
/* Note that we set sctx->date_header too so the values match */
date = mutt_buffer_pool_get ();
mutt_make_date (date);
mutt_str_replace (&sctx->date_header, mutt_b2s (date));
protected_headers->date = safe_strdup (mutt_b2s (date));
mutt_buffer_pool_release (&date);
protected_headers->from = rfc822_cpy_adr (msg->env->from, 0);
protected_headers->to = rfc822_cpy_adr (msg->env->to, 0);
protected_headers->cc = rfc822_cpy_adr (msg->env->cc, 0);
protected_headers->reply_to = rfc822_cpy_adr (msg->env->reply_to, 0);
mutt_prepare_envelope (protected_headers, 0);
mutt_env_to_intl (protected_headers, NULL, NULL);
mutt_free_envelope (&msg->content->mime_headers);
msg->content->mime_headers = protected_headers;
mutt_set_parameter ("protected-headers", "v1", &msg->content->parameter);
}
/* A note about msg->content->mime_headers. If postpone or send
* fails, the mime_headers is cleared out before returning to the
* compose menu. So despite the "robustness" code above and in the
* gen_gossip_list function below, mime_headers will not be set when
* entering mutt_protect().
*
* This is important to note because the user could toggle
* $crypt_protected_headers_write or $autocrypt off back in the
* compose menu. We don't want mutt_write_rfc822_header() to write
* stale data from one option if the other is set.
*/
#ifdef USE_AUTOCRYPT
if (option (OPTAUTOCRYPT) &&
!postpone &&
(security & AUTOCRYPT))
{
mutt_autocrypt_generate_gossip_list (msg);
}
#endif
if (sign)
{
if ((WithCrypto & APPLICATION_SMIME)
&& (security & APPLICATION_SMIME))
{
if (!(tmp_pbody = crypt_smime_sign_message (msg->content)))
goto cleanup;
pbody = tmp_smime_pbody = tmp_pbody;
}
if ((WithCrypto & APPLICATION_PGP)
&& (security & APPLICATION_PGP)
&& (!(security & (ENCRYPT | AUTOCRYPT)) || option (OPTPGPRETAINABLESIG)))
{
if (!(tmp_pbody = crypt_pgp_sign_message (msg->content)))
goto cleanup;
has_retainable_sig = 1;
sign = 0;
pbody = tmp_pgp_pbody = tmp_pbody;
}
if (WithCrypto
&& (security & APPLICATION_SMIME)
&& (security & APPLICATION_PGP))
{
/* here comes the draft ;-) */
}
}
if (security & (ENCRYPT | AUTOCRYPT))
{
if ((WithCrypto & APPLICATION_SMIME)
&& (security & APPLICATION_SMIME))
{
if (!(tmp_pbody = crypt_smime_build_smime_entity (tmp_smime_pbody,
keylist)))
{
/* signed ? free it! */
goto cleanup;
}
/* free tmp_body if messages was signed AND encrypted ... */
if (tmp_smime_pbody != msg->content && tmp_smime_pbody != tmp_pbody)
{
/* detach and don't delete msg->content,
which tmp_smime_pbody->parts after signing. */
tmp_smime_pbody->parts = tmp_smime_pbody->parts->next;
msg->content->next = NULL;
mutt_free_body (&tmp_smime_pbody);
}
pbody = tmp_pbody;
}
if ((WithCrypto & APPLICATION_PGP)
&& (security & APPLICATION_PGP))
{
if (!(pbody = crypt_pgp_encrypt_message (msg, tmp_pgp_pbody, keylist,
sign)))
{
/* did we perform a retainable signature? */
if (has_retainable_sig)
{
/* remove the outer multipart layer */
tmp_pgp_pbody = mutt_remove_multipart (tmp_pgp_pbody);
/* get rid of the signature */
mutt_free_body (&tmp_pgp_pbody->next);
}
goto cleanup;
}
/* destroy temporary signature envelope when doing retainable
* signatures.
*/
if (has_retainable_sig)
{
tmp_pgp_pbody = mutt_remove_multipart (tmp_pgp_pbody);
mutt_free_body (&tmp_pgp_pbody->next);
}
}
}
if (pbody)
{
msg->content = pbody;
rc = 0;
}
cleanup:
if (rc != 0)
{
mutt_free_envelope (&msg->content->mime_headers);
mutt_delete_parameter ("protected-headers", &msg->content->parameter);
FREE (&sctx->date_header);
}
if (sctx->pgp_sign_as)
mutt_str_replace (&PgpSignAs, orig_pgp_sign_as);
if (sctx->smime_sign_as)
mutt_str_replace (&SmimeSignAs, orig_smime_sign_as);
if (sctx->smime_crypt_alg || sctx->smime_crypt_alg_cleared)
mutt_str_replace (&SmimeCryptAlg, orig_smime_crypt_alg);
return rc;
}
int mutt_is_multipart_signed (BODY *b)
{
char *p;
if (!b || !(b->type == TYPEMULTIPART) ||
!b->subtype || ascii_strcasecmp(b->subtype, "signed"))
return 0;
if (!(p = mutt_get_parameter("protocol", b->parameter)))
return 0;
if (!(ascii_strcasecmp (p, "multipart/mixed")))
return SIGN;
if ((WithCrypto & APPLICATION_PGP)
&& !(ascii_strcasecmp (p, "application/pgp-signature")))
return PGPSIGN;
if ((WithCrypto & APPLICATION_SMIME)
&& !(ascii_strcasecmp (p, "application/x-pkcs7-signature")))
return SMIMESIGN;
if ((WithCrypto & APPLICATION_SMIME)
&& !(ascii_strcasecmp (p, "application/pkcs7-signature")))
return SMIMESIGN;
return 0;
}
int mutt_is_multipart_encrypted (BODY *b)
{
if ((WithCrypto & APPLICATION_PGP))
{
char *p;
if (!b || b->type != TYPEMULTIPART ||
!b->subtype || ascii_strcasecmp (b->subtype, "encrypted") ||
!(p = mutt_get_parameter ("protocol", b->parameter)) ||
ascii_strcasecmp (p, "application/pgp-encrypted"))
return 0;
return PGPENCRYPT;
}
return 0;
}
int mutt_is_valid_multipart_pgp_encrypted (BODY *b)
{
if (! mutt_is_multipart_encrypted (b))
return 0;
b = b->parts;
if (!b || b->type != TYPEAPPLICATION ||
!b->subtype || ascii_strcasecmp (b->subtype, "pgp-encrypted"))
return 0;
b = b->next;
if (!b || b->type != TYPEAPPLICATION ||
!b->subtype || ascii_strcasecmp (b->subtype, "octet-stream"))
return 0;
return PGPENCRYPT;
}
/*
* This checks for the malformed layout caused by MS Exchange in
* some cases:
* <multipart/mixed>
* <text/plain>
* <application/pgp-encrypted> [BASE64-encoded]
* <application/octet-stream> [BASE64-encoded]
* See ticket #3742
*/
int mutt_is_malformed_multipart_pgp_encrypted (BODY *b)
{
if (!(WithCrypto & APPLICATION_PGP))
return 0;
if (!b || b->type != TYPEMULTIPART ||
!b->subtype || ascii_strcasecmp (b->subtype, "mixed"))
return 0;
b = b->parts;
if (!b || b->type != TYPETEXT ||
!b->subtype || ascii_strcasecmp (b->subtype, "plain") ||
b->length != 0)
return 0;
b = b->next;
if (!b || b->type != TYPEAPPLICATION ||
!b->subtype || ascii_strcasecmp (b->subtype, "pgp-encrypted"))
return 0;
b = b->next;
if (!b || b->type != TYPEAPPLICATION ||
!b->subtype || ascii_strcasecmp (b->subtype, "octet-stream"))
return 0;
b = b->next;
if (b)
return 0;
return PGPENCRYPT;
}
int mutt_is_application_pgp (BODY *m)
{
int t = 0;
char *p;
if (m->type == TYPEAPPLICATION)
{
if (!ascii_strcasecmp (m->subtype, "pgp") || !ascii_strcasecmp (m->subtype, "x-pgp-message"))
{
if ((p = mutt_get_parameter ("x-action", m->parameter))
&& (!ascii_strcasecmp (p, "sign") || !ascii_strcasecmp (p, "signclear")))
t |= PGPSIGN;
if ((p = mutt_get_parameter ("format", m->parameter)) &&
!ascii_strcasecmp (p, "keys-only"))
t |= PGPKEY;
if (!t) t |= PGPENCRYPT; /* not necessarily correct, but... */
}
if (!ascii_strcasecmp (m->subtype, "pgp-signed"))
t |= PGPSIGN;
if (!ascii_strcasecmp (m->subtype, "pgp-keys"))
t |= PGPKEY;
}
else if (m->type == TYPETEXT && ascii_strcasecmp ("plain", m->subtype) == 0)
{
if (((p = mutt_get_parameter ("x-mutt-action", m->parameter))
|| (p = mutt_get_parameter ("x-action", m->parameter))
|| (p = mutt_get_parameter ("action", m->parameter)))
&& !ascii_strncasecmp ("pgp-sign", p, 8))
t |= PGPSIGN;
else if (p && !ascii_strncasecmp ("pgp-encrypt", p, 11))
t |= PGPENCRYPT;
else if (p && !ascii_strncasecmp ("pgp-keys", p, 7))
t |= PGPKEY;
}
if (t)
t |= PGPINLINE;
return t;
}
int mutt_is_application_smime (BODY *m)
{
char *t=NULL;
int len, complain=0;
if (!m)
return 0;
if ((m->type & TYPEAPPLICATION) && m->subtype)
{
/* S/MIME MIME types don't need x- anymore, see RFC2311 */
if (!ascii_strcasecmp (m->subtype, "x-pkcs7-mime") ||
!ascii_strcasecmp (m->subtype, "pkcs7-mime"))
{
if ((t = mutt_get_parameter ("smime-type", m->parameter)))
{
if (!ascii_strcasecmp (t, "enveloped-data"))
return SMIMEENCRYPT;
else if (!ascii_strcasecmp (t, "signed-data"))
return (SMIMESIGN|SMIMEOPAQUE);
else return 0;
}
/* Netscape 4.7 uses
* Content-Description: S/MIME Encrypted Message
* instead of Content-Type parameter
*/
if (!ascii_strcasecmp (m->description, "S/MIME Encrypted Message"))
return SMIMEENCRYPT;
complain = 1;
}
else if (ascii_strcasecmp (m->subtype, "octet-stream"))
return 0;
t = mutt_get_parameter ("name", m->parameter);
if (!t) t = m->d_filename;
if (!t) t = m->filename;
if (!t)
{
if (complain)
mutt_message (_("S/MIME messages with no hints on content are unsupported."));
return 0;
}
/* no .p7c, .p10 support yet. */
len = mutt_strlen (t) - 4;
if (len > 0 && *(t+len) == '.')
{
len++;
if (!ascii_strcasecmp ((t+len), "p7m"))
/* Not sure if this is the correct thing to do, but
it's required for compatibility with Outlook */
return (SMIMESIGN|SMIMEOPAQUE);
else if (!ascii_strcasecmp ((t+len), "p7s"))
return (SMIMESIGN|SMIMEOPAQUE);
}
}
return 0;
}
int crypt_query (BODY *m)
{
int t = 0;
if (!WithCrypto)
return 0;
if (!m)
return 0;
if (m->type == TYPEAPPLICATION)
{
if ((WithCrypto & APPLICATION_PGP))
t |= mutt_is_application_pgp(m);
if ((WithCrypto & APPLICATION_SMIME))
{
t |= mutt_is_application_smime(m);
if (t && m->goodsig) t |= GOODSIGN;
if (t && m->badsig) t |= BADSIGN;
}
}
else if ((WithCrypto & APPLICATION_PGP) && m->type == TYPETEXT)
{
t |= mutt_is_application_pgp (m);
if (t && m->goodsig)
t |= GOODSIGN;
}
if (m->type == TYPEMULTIPART)
{
t |= mutt_is_multipart_encrypted(m);
t |= mutt_is_multipart_signed (m);
t |= mutt_is_malformed_multipart_pgp_encrypted (m);
if (t && m->goodsig)
t |= GOODSIGN;
#ifdef USE_AUTOCRYPT
if (t && m->is_autocrypt)
t |= AUTOCRYPT;
#endif
}
if (m->type == TYPEMULTIPART || m->type == TYPEMESSAGE)
{
BODY *p;
int u, v, w;
u = m->parts ? 0xffffffff : 0; /* Bits set in all parts */
w = 0; /* Bits set in any part */
for (p = m->parts; p; p = p->next)
{
v = crypt_query (p);
u &= v; w |= v;
}
t |= u | (w & ~GOODSIGN);
if ((w & GOODSIGN) && !(u & GOODSIGN))
t |= PARTSIGN;
}
return t;
}
int crypt_write_signed(BODY *a, STATE *s, const char *tempfile)
{
FILE *fp;
int c;
short hadcr;
size_t bytes;
if (!WithCrypto)
return -1;
if (!(fp = safe_fopen (tempfile, "w")))
{
mutt_perror (tempfile);
return -1;
}
fseeko (s->fpin, a->hdr_offset, 0);
bytes = a->length + a->offset - a->hdr_offset;
hadcr = 0;
while (bytes > 0)
{
if ((c = fgetc (s->fpin)) == EOF)
break;
bytes--;
if (c == '\r')
hadcr = 1;
else
{
if (c == '\n' && !hadcr)
fputc ('\r', fp);
hadcr = 0;
}
fputc (c, fp);
}
safe_fclose (&fp);
return 0;
}
void convert_to_7bit (BODY *a)
{
if (!WithCrypto)
return;
while (a)
{
if (a->type == TYPEMULTIPART)
{
if (a->encoding != ENC7BIT)
{
a->encoding = ENC7BIT;
convert_to_7bit(a->parts);
}
else if ((WithCrypto & APPLICATION_PGP) && option (OPTPGPSTRICTENC))
convert_to_7bit (a->parts);
}
else if (a->type == TYPEMESSAGE &&
ascii_strcasecmp(a->subtype, "delivery-status"))
{
if (a->encoding != ENC7BIT)
mutt_message_to_7bit (a, NULL);
}
else if (a->encoding == ENC8BIT)
a->encoding = ENCQUOTEDPRINTABLE;
else if (a->encoding == ENCBINARY)
a->encoding = ENCBASE64;
else if (a->content && a->encoding != ENCBASE64 &&
(a->content->from || (a->content->space &&
option (OPTPGPSTRICTENC))))
a->encoding = ENCQUOTEDPRINTABLE;
a = a->next;
}
}
void crypt_extract_keys_from_messages (HEADER * h)
{
int i;
BUFFER *tempfname = NULL;
char *mbox;
ADDRESS *tmp = NULL;
FILE *fpout;
if (!WithCrypto)
return;
tempfname = mutt_buffer_pool_get ();
mutt_buffer_mktemp (tempfname);
if (!(fpout = safe_fopen (mutt_b2s (tempfname), "w")))
{
mutt_perror (mutt_b2s (tempfname));
goto cleanup;
}
if ((WithCrypto & APPLICATION_PGP))
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 & ENCRYPT &&
!crypt_valid_passphrase (Context->hdrs[Context->v2r[i]]->security))
{
safe_fclose (&fpout);
break;
}
if ((WithCrypto & APPLICATION_PGP)
&& (Context->hdrs[Context->v2r[i]]->security & APPLICATION_PGP))
{
mutt_copy_message (fpout, Context, Context->hdrs[Context->v2r[i]],
MUTT_CM_DECODE|MUTT_CM_CHARCONV, 0);
fflush(fpout);
mutt_endwin (_("Trying to extract PGP keys...\n"));
crypt_pgp_invoke_import (mutt_b2s (tempfname));
}
if ((WithCrypto & APPLICATION_SMIME)
&& (Context->hdrs[Context->v2r[i]]->security & APPLICATION_SMIME))
{
if (Context->hdrs[Context->v2r[i]]->security & ENCRYPT)
mutt_copy_message (fpout, Context, Context->hdrs[Context->v2r[i]],
MUTT_CM_NOHEADER|MUTT_CM_DECODE_CRYPT
|MUTT_CM_DECODE_SMIME, 0);
else
mutt_copy_message (fpout, Context,
Context->hdrs[Context->v2r[i]], 0, 0);
fflush(fpout);
if (Context->hdrs[Context->v2r[i]]->env->from)
tmp = mutt_expand_aliases (Context->hdrs[Context->v2r[i]]->env->from);
else if (Context->hdrs[Context->v2r[i]]->env->sender)
tmp = mutt_expand_aliases (Context->hdrs[Context->v2r[i]]->env->sender);
mbox = tmp ? tmp->mailbox : NULL;
if (mbox)
{
mutt_endwin (_("Trying to extract S/MIME certificates...\n"));
crypt_smime_invoke_import (mutt_b2s (tempfname), mbox);
tmp = NULL;
}
}
rewind (fpout);
}
}
}
else
{
mutt_parse_mime_message (Context, h);
if (!(h->security & ENCRYPT && !crypt_valid_passphrase (h->security)))
{
if ((WithCrypto & APPLICATION_PGP)
&& (h->security & APPLICATION_PGP))
{
mutt_copy_message (fpout, Context, h, MUTT_CM_DECODE|MUTT_CM_CHARCONV, 0);
fflush(fpout);
mutt_endwin (_("Trying to extract PGP keys...\n"));
crypt_pgp_invoke_import (mutt_b2s (tempfname));
}
if ((WithCrypto & APPLICATION_SMIME)
&& (h->security & APPLICATION_SMIME))
{
if (h->security & ENCRYPT)
mutt_copy_message (fpout, Context, h,
MUTT_CM_NOHEADER | MUTT_CM_DECODE_CRYPT | MUTT_CM_DECODE_SMIME,
0);
else
mutt_copy_message (fpout, Context, h, 0, 0);
fflush(fpout);
if (h->env->from) tmp = mutt_expand_aliases (h->env->from);
else if (h->env->sender) tmp = mutt_expand_aliases (h->env->sender);
mbox = tmp ? tmp->mailbox : NULL;
if (mbox) /* else ? */
{
mutt_message (_("Trying to extract S/MIME certificates...\n"));
crypt_smime_invoke_import (mutt_b2s (tempfname), mbox);
}
}
}
}
safe_fclose (&fpout);
if (isendwin())
mutt_any_key_to_continue (NULL);
mutt_unlink (mutt_b2s (tempfname));
if ((WithCrypto & APPLICATION_PGP))
unset_option (OPTDONTHANDLEPGPKEYS);
cleanup:
mutt_buffer_pool_release (&tempfname);
}
int crypt_get_keys (HEADER *msg, char **keylist, int oppenc_mode)
{
ADDRESS *adrlist = NULL, *last = NULL;
const char *fqdn = mutt_fqdn (1);
char *self_encrypt = NULL;
size_t keylist_size;
/* Do a quick check to make sure that we can find all of the encryption
* keys if the user has requested this service.
*/
if (!WithCrypto)
return 0;
*keylist = NULL;
#ifdef USE_AUTOCRYPT
if (!oppenc_mode && (msg->security & AUTOCRYPT))
{
if (mutt_autocrypt_ui_recommendation (msg, keylist) <= AUTOCRYPT_REC_NO)
return (-1);
return (0);
}
#endif
if ((WithCrypto & APPLICATION_PGP))
set_option (OPTPGPCHECKTRUST);
last = rfc822_append (&adrlist, msg->env->to, 0);
last = rfc822_append (last ? &last : &adrlist, msg->env->cc, 0);
rfc822_append (last ? &last : &adrlist, msg->env->bcc, 0);
if (fqdn)
rfc822_qualify (adrlist, fqdn);
adrlist = mutt_remove_duplicates (adrlist);
if (oppenc_mode || (msg->security & ENCRYPT))
{
if ((WithCrypto & APPLICATION_PGP)
&& (msg->security & APPLICATION_PGP))
{
if ((*keylist = crypt_pgp_findkeys (adrlist, oppenc_mode)) == NULL)
{
rfc822_free_address (&adrlist);
return (-1);
}
unset_option (OPTPGPCHECKTRUST);
if (option (OPTPGPSELFENCRYPT))
self_encrypt = PgpDefaultKey;
}
if ((WithCrypto & APPLICATION_SMIME)
&& (msg->security & APPLICATION_SMIME))
{
if ((*keylist = crypt_smime_findkeys (adrlist, oppenc_mode)) == NULL)
{
rfc822_free_address (&adrlist);
return (-1);
}
if (option (OPTSMIMESELFENCRYPT))
self_encrypt = SmimeDefaultKey;
}
}
if (!oppenc_mode && self_encrypt)
{
keylist_size = mutt_strlen (*keylist);
safe_realloc (keylist, keylist_size + mutt_strlen (self_encrypt) + 2);
sprintf (*keylist + keylist_size, " %s", self_encrypt); /* __SPRINTF_CHECKED__ */
}
rfc822_free_address (&adrlist);
return (0);
}
/*
* Check if all recipients keys can be automatically determined.
* Enable encryption if they can, otherwise disable encryption.
*/
void crypt_opportunistic_encrypt(HEADER *msg)
{
char *pgpkeylist = NULL;
if (!WithCrypto)
return;
if (! (option (OPTCRYPTOPPORTUNISTICENCRYPT) && (msg->security & OPPENCRYPT)) )
return;
crypt_get_keys (msg, &pgpkeylist, 1);
if (pgpkeylist != NULL )
{
msg->security |= ENCRYPT;
FREE (&pgpkeylist);
}
else
{
msg->security &= ~ENCRYPT;
}
}
static void crypt_fetch_signatures (BODY ***signatures, BODY *a, int *n)
{
if (!WithCrypto)
return;
for (; a; a = a->next)
{
if (a->type == TYPEMULTIPART)
crypt_fetch_signatures (signatures, a->parts, n);
else
{
if ((*n % 5) == 0)
safe_realloc (signatures, (*n + 6) * sizeof (BODY **));
(*signatures)[(*n)++] = a;
}
}
}
int mutt_should_hide_protected_subject (HEADER *h)
{
if (option (OPTCRYPTPROTHDRSWRITE) &&
(h->security & (ENCRYPT | AUTOCRYPT)) &&
!(h->security & INLINE) &&
ProtHdrSubject)
return 1;
return 0;
}
int mutt_protected_headers_handler (BODY *a, STATE *s)
{
if (option (OPTCRYPTPROTHDRSREAD) && a->mime_headers)
{
if (a->mime_headers->subject)
{
if ((s->flags & MUTT_DISPLAY) && option (OPTWEED) &&
mutt_matches_ignore ("subject", Ignore) &&
!mutt_matches_ignore ("subject", UnIgnore))
return 0;
state_mark_protected_header (s);
mutt_write_one_header (s->fpout, "Subject", a->mime_headers->subject,
s->prefix,
mutt_window_wrap_cols (MuttIndexWindow, Wrap),
(s->flags & MUTT_DISPLAY) ? CH_DISPLAY : 0);
state_puts ("\n", s);
}
}
return 0;
}
/*
* This routine verifies a "multipart/signed" body.
*/
int mutt_signed_handler (BODY *a, STATE *s)
{
BUFFER *tempfile = NULL;
int signed_type;
int inconsistent = 0;
BODY *b = a;
BODY **signatures = NULL;
int sigcnt = 0;
int i;
short goodsig = 1;
int rc = 0;
if (!WithCrypto)
return -1;
a = a->parts;
signed_type = mutt_is_multipart_signed (b);
if (!signed_type)
{
/* A null protocol value is already checked for in mutt_body_handler() */
state_printf (s, _("[-- Error: "
"Unknown multipart/signed protocol %s! --]\n\n"),
mutt_get_parameter ("protocol", b->parameter));
return mutt_body_handler (a, s);
}
if (!(a && a->next))
inconsistent = 1;
else
{
switch (signed_type)
{
case SIGN:
if (a->next->type != TYPEMULTIPART ||
ascii_strcasecmp (a->next->subtype, "mixed"))
inconsistent = 1;
break;
case PGPSIGN:
if (a->next->type != TYPEAPPLICATION ||
ascii_strcasecmp (a->next->subtype, "pgp-signature"))
inconsistent = 1;
break;
case SMIMESIGN:
if (a->next->type != TYPEAPPLICATION ||
(ascii_strcasecmp (a->next->subtype, "x-pkcs7-signature") &&
ascii_strcasecmp (a->next->subtype, "pkcs7-signature")))
inconsistent = 1;
break;
default:
inconsistent = 1;
}
}
if (inconsistent)
{
state_attach_puts (_("[-- Error: "
"Missing or bad-format multipart/signed signature!"
" --]\n\n"),
s);
return mutt_body_handler (a, s);
}
if (s->flags & MUTT_DISPLAY)
{
crypt_fetch_signatures (&signatures, a->next, &sigcnt);
if (sigcnt)
{
tempfile = mutt_buffer_pool_get ();
mutt_buffer_mktemp (tempfile);
if (crypt_write_signed (a, s, mutt_b2s (tempfile)) == 0)
{
for (i = 0; i < sigcnt; i++)
{
if ((WithCrypto & APPLICATION_PGP)
&& signatures[i]->type == TYPEAPPLICATION
&& !ascii_strcasecmp (signatures[i]->subtype, "pgp-signature"))
{
if (crypt_pgp_verify_one (signatures[i], s, mutt_b2s (tempfile)) != 0)
goodsig = 0;
continue;
}
if ((WithCrypto & APPLICATION_SMIME)
&& signatures[i]->type == TYPEAPPLICATION
&& (!ascii_strcasecmp(signatures[i]->subtype, "x-pkcs7-signature")
|| !ascii_strcasecmp(signatures[i]->subtype, "pkcs7-signature")))
{
if (crypt_smime_verify_one (signatures[i], s, mutt_b2s (tempfile)) != 0)
goodsig = 0;
continue;
}
state_printf (s, _("[-- Warning: "
"We can't verify %s/%s signatures. --]\n\n"),
TYPE(signatures[i]), signatures[i]->subtype);
}
}
mutt_unlink (mutt_b2s (tempfile));
mutt_buffer_pool_release (&tempfile);
b->goodsig = goodsig;
b->badsig = !goodsig;
/* Now display the signed body */
state_attach_puts (_("[-- The following data is signed --]\n\n"), s);
mutt_protected_headers_handler (a, s);
FREE (&signatures);
}
else
state_attach_puts (_("[-- Warning: Can't find any signatures. --]\n\n"), s);
}
rc = mutt_body_handler (a, s);
if (s->flags & MUTT_DISPLAY && sigcnt)
state_attach_puts (_("\n[-- End of signed data --]\n"), s);
return rc;
}
/* Obtain pointers to fingerprint or short or long key ID, if any.
* See mutt_crypt.h for details.
*/
const char* crypt_get_fingerprint_or_id (char *p, const char **pphint,
const char **ppl, const char **pps)
{
const char *ps, *pl, *phint;
char *pfcopy, *pf, *s1, *s2;
char c;
int isid;
size_t hexdigits;
/* User input may be partial name, fingerprint or short or long key ID,
* independent of OPTPGPLONGIDS.
* Fingerprint without spaces is 40 hex digits (SHA-1) or 32 hex digits (MD5).
* Strip leading "0x" for key ID detection and prepare pl and ps to indicate
* if an ID was found and to simplify logic in the key loop's inner
* condition of the caller. */
pf = mutt_skip_whitespace (p);
if (!mutt_strncasecmp (pf, "0x", 2))
pf += 2;
/* Check if a fingerprint is given, must be hex digits only, blanks
* separating groups of 4 hex digits are allowed. Also pre-check for ID. */
isid = 2; /* unknown */
hexdigits = 0;
s1 = pf;
do
{
c = *(s1++);
if (('0' <= c && c <= '9') || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f'))
{
++hexdigits;
if (isid == 2)
isid = 1; /* it is an ID so far */
}
else if (c)
{
isid = 0; /* not an ID */
if (c == ' ' && ((hexdigits % 4) == 0))
; /* skip blank before or after 4 hex digits */
else
break; /* any other character or position */
}
} while (c);
/* If at end of input, check for correct fingerprint length and copy if. */
pfcopy = (!c && ((hexdigits == 40) || (hexdigits == 32)) ? safe_strdup (pf) : NULL);
if (pfcopy)
{
/* Use pfcopy to strip all spaces from fingerprint and as hint. */
s1 = s2 = pfcopy;
do
{
*(s1++) = *(s2 = mutt_skip_whitespace (s2));
} while (*(s2++));
phint = pfcopy;
ps = pl = NULL;
}
else
{
phint = p;
ps = pl = NULL;
if (isid == 1)
{
if (mutt_strlen (pf) == 16)
pl = pf; /* long key ID */
else if (mutt_strlen (pf) == 8)
ps = pf; /* short key ID */
}
}
*pphint = phint;
*ppl = pl;
*pps = ps;
return pfcopy;
}
/*
* Used by pgp_findKeys and find_keys to check if a crypt-hook
* value is a key id.
*/
short crypt_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;
}