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/*
* Copyright (C) 1996,1997 Michael R. Elkins <me@mutt.org>
* Copyright (C) 1999-2000,2002-4,2006 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 <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);
setlocale (LC_TIME, "");
strftime (p, sizeof (p), _(" (current time: %c)"), localtime (&t));
setlocale (LC_TIME, "C");
}
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;
}
int mutt_protect (HEADER *msg, char *keylist)
{
BODY *pbody = NULL, *tmp_pbody = NULL;
BODY *tmp_smime_pbody = NULL;
BODY *tmp_pgp_pbody = NULL;
int flags = (WithCrypto & APPLICATION_PGP)? msg->security: 0;
int i;
if (!WithCrypto)
return -1;
if ((msg->security & SIGN) && !crypt_valid_passphrase (msg->security))
return (-1);
if ((WithCrypto & APPLICATION_PGP) && ((msg->security & PGPINLINE) == PGPINLINE))
{
/* they really want to send it inline... go for it */
if (!isendwin ()) mutt_endwin _("Invoking PGP...");
pbody = crypt_pgp_traditional_encryptsign (msg->content, flags, keylist);
if (pbody)
{
msg->content = pbody;
return 0;
}
/* 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?"))) != M_YES)
{
mutt_error _("Mail not sent.");
return -1;
}
/* 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) && (msg->security & SIGN))
{
/* Set sender (necessary for e.g. PKA). */
if ((WithCrypto & APPLICATION_SMIME)
&& (msg->security & APPLICATION_SMIME))
crypt_smime_set_sender (msg->env->from->mailbox);
else if ((WithCrypto & APPLICATION_PGP)
&& (msg->security & APPLICATION_PGP))
crypt_pgp_set_sender (msg->env->from->mailbox);
}
if (msg->security & SIGN)
{
if ((WithCrypto & APPLICATION_SMIME)
&& (msg->security & APPLICATION_SMIME))
{
if (!(tmp_pbody = crypt_smime_sign_message (msg->content)))
return -1;
pbody = tmp_smime_pbody = tmp_pbody;
}
if ((WithCrypto & APPLICATION_PGP)
&& (msg->security & APPLICATION_PGP)
&& (!(flags & ENCRYPT) || option (OPTPGPRETAINABLESIG)))
{
if (!(tmp_pbody = crypt_pgp_sign_message (msg->content)))
return -1;
flags &= ~SIGN;
pbody = tmp_pgp_pbody = tmp_pbody;
}
if (WithCrypto
&& (msg->security & APPLICATION_SMIME)
&& (msg->security & APPLICATION_PGP))
{
/* here comes the draft ;-) */
}
}
if (msg->security & ENCRYPT)
{
if ((WithCrypto & APPLICATION_SMIME)
&& (msg->security & APPLICATION_SMIME))
{
if (!(tmp_pbody = crypt_smime_build_smime_entity (tmp_smime_pbody,
keylist)))
{
/* signed ? free it! */
return (-1);
}
/* free tmp_body if messages was signed AND encrypted ... */
if (tmp_smime_pbody != msg->content && tmp_smime_pbody != tmp_pbody)
{
/* detatch and dont'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)
&& (msg->security & APPLICATION_PGP))
{
if (!(pbody = crypt_pgp_encrypt_message (tmp_pgp_pbody, keylist,
flags & SIGN)))
{
/* did we perform a retainable signature? */
if (flags != msg->security)
{
/* 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);
}
return (-1);
}
/* destroy temporary signature envelope when doing retainable
* signatures.
*/
if (flags != msg->security)
{
tmp_pgp_pbody = mutt_remove_multipart (tmp_pgp_pbody);
mutt_free_body (&tmp_pgp_pbody->next);
}
}
}
if(pbody)
msg->content = pbody;
return 0;
}
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_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"))
#if 0
return SMIMEENCRYPT;
#else
/* Not sure if this is the correct thing to do, but
it's required for compatibility with Outlook */
return (SMIMESIGN|SMIMEOPAQUE);
#endif
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);
if (t && m->goodsig)
t |= GOODSIGN;
}
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;
char tempfname[_POSIX_PATH_MAX], *mbox;
ADDRESS *tmp = NULL;
FILE *fpout;
if (!WithCrypto)
return;
mutt_mktemp (tempfname, sizeof (tempfname));
if (!(fpout = safe_fopen (tempfname, "w")))
{
mutt_perror (tempfname);
return;
}
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]],
M_CM_DECODE|M_CM_CHARCONV, 0);
fflush(fpout);
mutt_endwin (_("Trying to extract PGP keys...\n"));
crypt_pgp_invoke_import (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]],
M_CM_NOHEADER|M_CM_DECODE_CRYPT
|M_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 (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, M_CM_DECODE|M_CM_CHARCONV, 0);
fflush(fpout);
mutt_endwin (_("Trying to extract PGP keys...\n"));
crypt_pgp_invoke_import (tempfname);
}
if ((WithCrypto & APPLICATION_SMIME)
&& (h->security & APPLICATION_SMIME))
{
if (h->security & ENCRYPT)
mutt_copy_message (fpout, Context, h, M_CM_NOHEADER
|M_CM_DECODE_CRYPT
|M_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 (tempfname, mbox);
}
}
}
}
safe_fclose (&fpout);
if (isendwin())
mutt_any_key_to_continue (NULL);
mutt_unlink (tempfname);
if ((WithCrypto & APPLICATION_PGP))
unset_option (OPTDONTHANDLEPGPKEYS);
}
int crypt_get_keys (HEADER *msg, char **keylist)
{
/* 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;
if ((WithCrypto & APPLICATION_PGP))
set_option (OPTPGPCHECKTRUST);
*keylist = NULL;
if (msg->security & ENCRYPT)
{
if ((WithCrypto & APPLICATION_PGP)
&& (msg->security & APPLICATION_PGP))
{
if ((*keylist = crypt_pgp_findkeys (msg->env->to, msg->env->cc,
msg->env->bcc)) == NULL)
return (-1);
unset_option (OPTPGPCHECKTRUST);
}
if ((WithCrypto & APPLICATION_SMIME)
&& (msg->security & APPLICATION_SMIME))
{
if ((*keylist = crypt_smime_findkeys (msg->env->to, msg->env->cc,
msg->env->bcc)) == NULL)
return (-1);
}
}
return (0);
}
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;
}
}
}
/*
* This routine verifies a "multipart/signed" body.
*/
int mutt_signed_handler (BODY *a, STATE *s)
{
char tempfile[_POSIX_PATH_MAX];
char *protocol;
int protocol_major = TYPEOTHER;
char *protocol_minor = NULL;
BODY *b = a;
BODY **signatures = NULL;
int sigcnt = 0;
int i;
short goodsig = 1;
int rc = 0;
if (!WithCrypto)
return -1;
protocol = mutt_get_parameter ("protocol", a->parameter);
a = a->parts;
/* extract the protocol information */
if (protocol)
{
char major[STRING];
char *t;
if ((protocol_minor = strchr (protocol, '/'))) protocol_minor++;
strfcpy (major, protocol, sizeof(major));
if((t = strchr(major, '/')))
*t = '\0';
protocol_major = mutt_check_mime_type (major);
}
/* consistency check */
if (!(a && a->next && a->next->type == protocol_major &&
!mutt_strcasecmp (a->next->subtype, protocol_minor)))
{
state_attach_puts (_("[-- Error: "
"Inconsistent multipart/signed structure! --]\n\n"),
s);
return mutt_body_handler (a, s);
}
if ((WithCrypto & APPLICATION_PGP)
&& protocol_major == TYPEAPPLICATION
&& !ascii_strcasecmp (protocol_minor, "pgp-signature"))
;
else if ((WithCrypto & APPLICATION_SMIME)
&& protocol_major == TYPEAPPLICATION
&& !(ascii_strcasecmp (protocol_minor, "x-pkcs7-signature")
&& ascii_strcasecmp (protocol_minor, "pkcs7-signature")))
;
else if (protocol_major == TYPEMULTIPART
&& !ascii_strcasecmp (protocol_minor, "mixed"))
;
else
{
state_printf (s, _("[-- Error: "
"Unknown multipart/signed protocol %s! --]\n\n"),
protocol);
return mutt_body_handler (a, s);
}
if (s->flags & M_DISPLAY)
{
crypt_fetch_signatures (&signatures, a->next, &sigcnt);
if (sigcnt)
{
mutt_mktemp (tempfile, sizeof (tempfile));
if (crypt_write_signed (a, s, 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, 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, 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 (tempfile);
b->goodsig = goodsig;
b->badsig = !goodsig;
/* Now display the signed body */
state_attach_puts (_("[-- The following data is signed --]\n\n"), 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 & M_DISPLAY && sigcnt)
state_attach_puts (_("\n[-- End of signed data --]\n"), s);
return rc;
}