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smime.c
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/*
* Copyright (C) 2001,2002 Oliver Ehli <[email protected]>
* Copyright (C) 2002 Mike Schiraldi <[email protected]>
* 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.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "mutt.h"
#include "mutt_curses.h"
#include "mutt_menu.h"
#include "smime.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_SMIME
#include "mutt_crypt.h"
struct smime_command_context {
const char *key; /* %k */
const char *cryptalg; /* %a */
const char *fname; /* %f */
const char *sig_fname; /* %s */
const char *certificates; /* %c */
const char *intermediates; /* %i */
};
typedef struct {
unsigned int hash;
char suffix;
char email[256];
char nick[256];
char trust; /* i=Invalid r=revoked e=expired u=unverified v=verified t=trusted */
short public; /* 1=public 0=private */
} smime_id;
char SmimePass[STRING];
time_t SmimeExptime = 0; /* when does the cached passphrase expire? */
static char SmimeKeyToUse[_POSIX_PATH_MAX] = { 0 };
static char SmimeCertToUse[_POSIX_PATH_MAX];
static char SmimeIntermediateToUse[_POSIX_PATH_MAX];
/*
* Queries and passphrase handling.
*/
/* these are copies from pgp.c */
void smime_void_passphrase (void)
{
memset (SmimePass, 0, sizeof (SmimePass));
SmimeExptime = 0;
}
int smime_valid_passphrase (void)
{
time_t now = time (NULL);
if (now < SmimeExptime)
/* Use cached copy. */
return 1;
smime_void_passphrase();
if (mutt_get_password (_("Enter S/MIME passphrase:"), SmimePass, sizeof (SmimePass)) == 0)
{
SmimeExptime = time (NULL) + SmimeTimeout;
return (1);
}
else
SmimeExptime = 0;
return 0;
}
/*
* The OpenSSL interface
*/
/* This is almost identical to ppgp's invoking interface. */
static const char *_mutt_fmt_smime_command (char *dest,
size_t destlen,
size_t col,
char op,
const char *src,
const char *prefix,
const char *ifstring,
const char *elsestring,
unsigned long data,
format_flag flags)
{
char fmt[16];
struct smime_command_context *cctx = (struct smime_command_context *) data;
int optional = (flags & M_FORMAT_OPTIONAL);
switch (op)
{
case 'C':
{
if (!optional)
{
char path[_POSIX_PATH_MAX];
char buf1[LONG_STRING], buf2[LONG_STRING];
struct stat sb;
strfcpy (path, NONULL (SmimeCALocation), sizeof (path));
mutt_expand_path (path, sizeof (path));
mutt_quote_filename (buf1, sizeof (buf1), path);
if (stat (path, &sb) != 0 || !S_ISDIR (sb.st_mode))
snprintf (buf2, sizeof (buf2), "-CAfile %s", buf1);
else
snprintf (buf2, sizeof (buf2), "-CApath %s", buf1);
snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
snprintf (dest, destlen, fmt, buf2);
}
else if (!SmimeCALocation)
optional = 0;
break;
}
case 'c':
{ /* certificate (list) */
if (!optional) {
snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
snprintf (dest, destlen, fmt, NONULL(cctx->certificates));
}
else if (!cctx->certificates)
optional = 0;
break;
}
case 'i':
{ /* intermediate certificates */
if (!optional) {
snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
snprintf (dest, destlen, fmt, NONULL(cctx->intermediates));
}
else if (!cctx->intermediates)
optional = 0;
break;
}
case 's':
{ /* detached signature */
if (!optional)
{
snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
snprintf (dest, destlen, fmt, NONULL (cctx->sig_fname));
}
else if (!cctx->sig_fname)
optional = 0;
break;
}
case 'k':
{ /* private key */
if (!optional)
{
snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
snprintf (dest, destlen, fmt, NONULL (cctx->key));
}
else if (!cctx->key)
optional = 0;
break;
}
case 'a':
{ /* algorithm for encryption */
if (!optional) {
snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
snprintf (dest, destlen, fmt, NONULL (cctx->cryptalg));
}
else if (!cctx->key)
optional = 0;
break;
}
case 'f':
{ /* file to process */
if (!optional)
{
snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
snprintf (dest, destlen, fmt, NONULL (cctx->fname));
}
else if (!cctx->fname)
optional = 0;
break;
}
default:
*dest = '\0';
break;
}
if (optional)
mutt_FormatString (dest, destlen, col, ifstring, _mutt_fmt_smime_command,
data, 0);
else if (flags & M_FORMAT_OPTIONAL)
mutt_FormatString (dest, destlen, col, elsestring, _mutt_fmt_smime_command,
data, 0);
return (src);
}
static void mutt_smime_command (char *d, size_t dlen,
struct smime_command_context *cctx, const char *fmt)
{
mutt_FormatString (d, dlen, 0, NONULL(fmt), _mutt_fmt_smime_command,
(unsigned long) cctx, 0);
dprint (2,(debugfile, "mutt_smime_command: %s\n", d));
}
static pid_t smime_invoke (FILE **smimein, FILE **smimeout, FILE **smimeerr,
int smimeinfd, int smimeoutfd, int smimeerrfd,
const char *fname,
const char *sig_fname,
const char *cryptalg,
const char *key,
const char *certificates,
const char *intermediates,
const char *format)
{
struct smime_command_context cctx;
char cmd[HUGE_STRING];
memset (&cctx, 0, sizeof (cctx));
if (!format || !*format)
return (pid_t) -1;
cctx.fname = fname;
cctx.sig_fname = sig_fname;
cctx.key = key;
cctx.cryptalg = cryptalg;
cctx.certificates = certificates;
cctx.intermediates = intermediates;
mutt_smime_command (cmd, sizeof (cmd), &cctx, format);
return mutt_create_filter_fd (cmd, smimein, smimeout, smimeerr,
smimeinfd, smimeoutfd, smimeerrfd);
}
/*
* Key and certificate handling.
*/
/*
Search the certificate index for given mailbox.
return certificate file name.
*/
static void smime_entry (char *s, size_t l, MUTTMENU * menu, int num)
{
smime_id *Table = (smime_id*) menu->data;
smime_id this = Table[num];
char* truststate;
switch(this.trust) {
case 't':
truststate = N_("Trusted ");
break;
case 'v':
truststate = N_("Verified ");
break;
case 'u':
truststate = N_("Unverified");
break;
case 'e':
truststate = N_("Expired ");
break;
case 'r':
truststate = N_("Revoked ");
break;
case 'i':
truststate = N_("Invalid ");
break;
default:
truststate = N_("Unknown ");
}
if (this.public)
snprintf(s, l, " 0x%.8X.%i %s %-35.35s %s", this.hash, this.suffix, truststate, this.email, this.nick);
else
snprintf(s, l, " 0x%.8X.%i %-35.35s %s", this.hash, this.suffix, this.email, this.nick);
}
char* smime_ask_for_key (char *prompt, char *mailbox, short public)
{
char *fname;
smime_id *table = 0;
int table_count;
char index_file[_POSIX_PATH_MAX];
FILE *index;
char buf[LONG_STRING];
char fields[5][STRING];
int numFields, hash_suffix, done, cur; /* The current entry */
MUTTMENU* menu;
unsigned int hash;
char helpstr[HUGE_STRING*3];
char qry[256];
char title[256];
if (!prompt) prompt = _("Enter keyID: ");
snprintf(index_file, sizeof (index_file), "%s/.index",
public ? NONULL(SmimeCertificates) : NONULL(SmimeKeys));
FOREVER
{
*qry = 0;
if (mutt_get_field(prompt,
qry, sizeof(qry), 0))
return NULL;
snprintf(title, sizeof(title), _("S/MIME certificates matching \"%s\"."),
qry);
index = fopen(index_file, "r");
if (index == NULL)
{
mutt_perror (index_file);
return NULL;
}
/* Read Entries */
cur = 0;
table_count = 0;
while (!feof(index)) {
numFields = fscanf (index, MUTT_FORMAT(STRING) " %x.%i " MUTT_FORMAT(STRING), fields[0], &hash,
&hash_suffix, fields[2]);
if (public)
fscanf (index, MUTT_FORMAT(STRING) " " MUTT_FORMAT(STRING) "\n", fields[3], fields[4]);
/* 0=email 1=name 2=nick 3=intermediate 4=trust */
if (numFields < 2) continue;
/* Check if query matches this certificate */
if (!mutt_stristr(fields[0], qry) &&
!mutt_stristr(fields[2], qry))
continue;
++table_count;
safe_realloc(&table, sizeof(smime_id) * table_count);
table[cur].hash = hash;
table[cur].suffix = hash_suffix;
strncpy(table[cur].email, fields[0], sizeof(table[cur].email));
strncpy(table[cur].nick, fields[2], sizeof(table[cur].nick));
table[cur].trust = *fields[4];
table[cur].public = public;
cur++;
}
safe_fclose (&index);
/* Make Helpstring */
helpstr[0] = 0;
mutt_make_help (buf, sizeof (buf), _("Exit "), MENU_SMIME, OP_EXIT);
strcat (helpstr, buf); /* __STRCAT_CHECKED__ */
mutt_make_help (buf, sizeof (buf), _("Select "), MENU_SMIME,
OP_GENERIC_SELECT_ENTRY);
strcat (helpstr, buf); /* __STRCAT_CHECKED__ */
mutt_make_help (buf, sizeof(buf), _("Help"), MENU_SMIME, OP_HELP);
strcat (helpstr, buf); /* __STRCAT_CHECKED__ */
/* Create the menu */
menu = mutt_new_menu(MENU_SMIME);
menu->max = cur;
menu->make_entry = smime_entry;
menu->help = helpstr;
menu->data = table;
menu->title = title;
/* sorting keys might be done later - TODO */
mutt_clear_error();
done = 0;
hash = 0;
while (!done) {
switch (mutt_menuLoop (menu)) {
case OP_GENERIC_SELECT_ENTRY:
cur = menu->current;
hash = 1;
done = 1;
break;
case OP_EXIT:
hash = 0;
done = 1;
break;
}
}
if (table_count && hash)
safe_asprintf(&fname, "%.8x.%i", table[cur].hash, table[cur].suffix);
else fname = NULL;
mutt_menuDestroy (&menu);
FREE (&table);
set_option (OPTNEEDREDRAW);
if (fname) return fname;
}
}
char *smime_get_field_from_db (char *mailbox, char *query, short public, short may_ask)
{
int addr_len, query_len, found = 0, ask = 0, choice = 0;
char cert_path[_POSIX_PATH_MAX];
char buf[LONG_STRING], prompt[STRING];
char fields[5][STRING];
char key[STRING];
int numFields;
struct stat info;
char key_trust_level = 0;
FILE *fp;
if(!mailbox && !query) return(NULL);
addr_len = mailbox ? mutt_strlen (mailbox) : 0;
query_len = query ? mutt_strlen (query) : 0;
*key = '\0';
/* index-file format:
mailbox certfile label issuer_certfile trust_flags\n
certfile is a hash value generated by openssl.
Note that this was done according to the OpenSSL
specs on their CA-directory.
*/
snprintf (cert_path, sizeof (cert_path), "%s/.index",
(public ? NONULL(SmimeCertificates) : NONULL(SmimeKeys)));
if (!stat (cert_path, &info))
{
if ((fp = safe_fopen (cert_path, "r")) == NULL)
{
mutt_perror (cert_path);
return (NULL);
}
while (fgets (buf, sizeof (buf) - 1, fp) != NULL)
if (mailbox && !(mutt_strncasecmp (mailbox, buf, addr_len)))
{
numFields = sscanf (buf,
MUTT_FORMAT(STRING) " " MUTT_FORMAT(STRING) " "
MUTT_FORMAT(STRING) " " MUTT_FORMAT(STRING) " "
MUTT_FORMAT(STRING) "\n",
fields[0], fields[1],
fields[2], fields[3],
fields[4]);
if (numFields < 2)
continue;
if (mailbox && public &&
(*fields[4] == 'i' || *fields[4] == 'e' || *fields[4] == 'r'))
continue;
if (found)
{
if (public && *fields[4] == 'u' )
snprintf (prompt, sizeof (prompt),
_("ID %s is unverified. Do you want to use it for %s ?"),
fields[1], mailbox);
else if (public && *fields[4] == 'v' )
snprintf (prompt, sizeof (prompt),
_("Use (untrusted!) ID %s for %s ?"),
fields[1], mailbox);
else
snprintf (prompt, sizeof (prompt), _("Use ID %s for %s ?"),
fields[1], mailbox);
if (may_ask == 0)
choice = M_YES;
if (may_ask && (choice = mutt_yesorno (prompt, M_NO)) == -1)
{
found = 0;
ask = 0;
*key = '\0';
break;
}
else if (choice == M_NO)
{
ask = 1;
continue;
}
else if (choice == M_YES)
{
strfcpy (key, fields[1], sizeof (key));
ask = 0;
break;
}
}
else
{
if (public)
key_trust_level = *fields[4];
strfcpy (key, fields[1], sizeof (key));
}
found = 1;
}
else if(query)
{
numFields = sscanf (buf,
MUTT_FORMAT(STRING) " " MUTT_FORMAT(STRING) " "
MUTT_FORMAT(STRING) " " MUTT_FORMAT(STRING) " "
MUTT_FORMAT(STRING) "\n",
fields[0], fields[1],
fields[2], fields[3],
fields[4]);
/* query = label: return certificate. */
if (numFields >= 3 &&
!(mutt_strncasecmp (query, fields[2], query_len)))
{
ask = 0;
strfcpy (key, fields[1], sizeof (key));
}
/* query = certificate: return intermediate certificate. */
else if (numFields >= 4 &&
!(mutt_strncasecmp (query, fields[1], query_len)))
{
ask = 0;
strfcpy (key, fields[3], sizeof (key));
}
}
safe_fclose (&fp);
if (ask)
{
if (public && *fields[4] == 'u' )
snprintf (prompt, sizeof (prompt),
_("ID %s is unverified. Do you want to use it for %s ?"),
fields[1], mailbox);
else if (public && *fields[4] == 'v' )
snprintf (prompt, sizeof (prompt),
_("Use (untrusted!) ID %s for %s ?"),
fields[1], mailbox);
else
snprintf (prompt, sizeof(prompt), _("Use ID %s for %s ?"), key,
mailbox);
choice = mutt_yesorno (prompt, M_NO);
if (choice == -1 || choice == M_NO)
*key = '\0';
}
else if (key_trust_level && may_ask)
{
if (key_trust_level == 'u' )
{
snprintf (prompt, sizeof (prompt),
_("ID %s is unverified. Do you want to use it for %s ?"),
key, mailbox);
choice = mutt_yesorno (prompt, M_NO);
if (choice != M_YES)
*key = '\0';
}
else if (key_trust_level == 'v' )
{
mutt_error (_("Warning: You have not yet decided to trust ID %s. (any key to continue)"), key);
mutt_sleep (5);
}
}
}
/* Note: safe_strdup ("") returns NULL. */
return safe_strdup (key);
}
/*
This sets the '*ToUse' variables for an upcoming decryption, where
the reuquired key is different from SmimeDefaultKey.
*/
void _smime_getkeys (char *mailbox)
{
char *k = NULL;
char buf[STRING];
k = smime_get_field_from_db (mailbox, NULL, 0, 1);
if (!k)
{
snprintf(buf, sizeof(buf), _("Enter keyID for %s: "),
mailbox);
k = smime_ask_for_key(buf, mailbox, 0);
}
if (k)
{
/* the key used last time. */
if (*SmimeKeyToUse &&
!mutt_strcasecmp (k, SmimeKeyToUse + mutt_strlen (SmimeKeys)+1))
{
FREE (&k);
return;
}
else smime_void_passphrase ();
snprintf (SmimeKeyToUse, sizeof (SmimeKeyToUse), "%s/%s",
NONULL(SmimeKeys), k);
snprintf (SmimeCertToUse, sizeof (SmimeCertToUse), "%s/%s",
NONULL(SmimeCertificates), k);
if (mutt_strcasecmp (k, SmimeDefaultKey))
smime_void_passphrase ();
FREE (&k);
return;
}
if (*SmimeKeyToUse)
{
if (!mutt_strcasecmp (SmimeDefaultKey,
SmimeKeyToUse + mutt_strlen (SmimeKeys)+1))
return;
smime_void_passphrase ();
}
snprintf (SmimeKeyToUse, sizeof (SmimeKeyToUse), "%s/%s",
NONULL (SmimeKeys), NONULL (SmimeDefaultKey));
snprintf (SmimeCertToUse, sizeof (SmimeCertToUse), "%s/%s",
NONULL (SmimeCertificates), NONULL (SmimeDefaultKey));
}
void smime_getkeys (ENVELOPE *env)
{
ADDRESS *t;
int found = 0;
if (option (OPTSDEFAULTDECRYPTKEY) && SmimeDefaultKey && *SmimeDefaultKey)
{
snprintf (SmimeKeyToUse, sizeof (SmimeKeyToUse), "%s/%s",
NONULL (SmimeKeys), SmimeDefaultKey);
snprintf (SmimeCertToUse, sizeof (SmimeCertToUse), "%s/%s",
NONULL(SmimeCertificates), SmimeDefaultKey);
return;
}
for (t = env->to; !found && t; t = t->next)
if (mutt_addr_is_user (t))
{
found = 1;
_smime_getkeys (t->mailbox);
}
for (t = env->cc; !found && t; t = t->next)
if (mutt_addr_is_user (t))
{
found = 1;
_smime_getkeys (t->mailbox);
}
if (!found && (t = mutt_default_from()))
{
_smime_getkeys (t->mailbox);
rfc822_free_address (&t);
}
}
/* 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 *smime_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;
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;
if ((keyID = smime_get_field_from_db (q->mailbox, NULL, 1, 1)) == NULL)
{
snprintf(buf, sizeof(buf),
_("Enter keyID for %s: "),
q->mailbox);
keyID = smime_ask_for_key(buf, q->mailbox, 1);
}
if(!keyID)
{
mutt_message (_("No (valid) certificate found for %s."), q->mailbox);
FREE (&keylist);
rfc822_free_address (&tmp);
rfc822_free_address (&addr);
return NULL;
}
keylist_size += mutt_strlen (keyID) + 2;
safe_realloc (&keylist, keylist_size);
sprintf (keylist + keylist_used, "%s\n", keyID); /* __SPRINTF_CHECKED__ */
keylist_used = mutt_strlen (keylist);
rfc822_free_address (&addr);
}
rfc822_free_address (&tmp);
return (keylist);
}
static int smime_handle_cert_email (char *certificate, char *mailbox,
int copy, char ***buffer, int *num)
{
FILE *fpout = NULL, *fperr = NULL;
char tmpfname[_POSIX_PATH_MAX];
char email[STRING];
int ret = -1, count = 0;
pid_t thepid;
mutt_mktemp (tmpfname, sizeof (tmpfname));
if ((fperr = safe_fopen (tmpfname, "w+")) == NULL)
{
mutt_perror (tmpfname);
return 1;
}
mutt_unlink (tmpfname);
mutt_mktemp (tmpfname, sizeof (tmpfname));
if ((fpout = safe_fopen (tmpfname, "w+")) == NULL)
{
safe_fclose (&fperr);
mutt_perror (tmpfname);
return 1;
}
mutt_unlink (tmpfname);
if ((thepid = smime_invoke (NULL, NULL, NULL,
-1, fileno (fpout), fileno (fperr),
certificate, NULL, NULL, NULL, NULL, NULL,
SmimeGetCertEmailCommand))== -1)
{
mutt_message (_("Error: unable to create OpenSSL subprocess!"));
safe_fclose (&fperr);
safe_fclose (&fpout);
return 1;
}
mutt_wait_filter (thepid);
fflush (fpout);
rewind (fpout);
fflush (fperr);
rewind (fperr);
while ((fgets (email, sizeof (email), fpout)))
{
*(email + mutt_strlen (email)-1) = '\0';
if(mutt_strncasecmp (email, mailbox, mutt_strlen (mailbox)) == 0)
ret=1;
ret = ret < 0 ? 0 : ret;
count++;
}
if (ret == -1)
{
mutt_endwin(NULL);
mutt_copy_stream (fperr, stdout);
mutt_any_key_to_continue (_("Error: unable to create OpenSSL subprocess!"));
ret = 1;
}
else if (!ret)
ret = 1;
else ret = 0;
if(copy && buffer && num)
{
(*num) = count;
*buffer = safe_calloc(sizeof(char*), count);
count = 0;
rewind (fpout);
while ((fgets (email, sizeof (email), fpout)))
{
*(email + mutt_strlen (email) - 1) = '\0';
(*buffer)[count] = safe_calloc(1, mutt_strlen (email) + 1);
strncpy((*buffer)[count], email, mutt_strlen (email));
count++;
}
}
else if(copy) ret = 2;
safe_fclose (&fpout);
safe_fclose (&fperr);
return ret;
}
static char *smime_extract_certificate (char *infile)
{
FILE *fpout = NULL, *fperr = NULL;
char pk7out[_POSIX_PATH_MAX], certfile[_POSIX_PATH_MAX];
char tmpfname[_POSIX_PATH_MAX];
pid_t thepid;
int empty;
mutt_mktemp (tmpfname, sizeof (tmpfname));
if ((fperr = safe_fopen (tmpfname, "w+")) == NULL)
{
mutt_perror (tmpfname);
return NULL;
}
mutt_unlink (tmpfname);
mutt_mktemp (pk7out, sizeof (pk7out));
if ((fpout = safe_fopen (pk7out, "w+")) == NULL)
{
safe_fclose (&fperr);
mutt_perror (pk7out);
return NULL;
}
/* Step 1: Convert the signature to a PKCS#7 structure, as we can't
extract the full set of certificates directly.
*/
if ((thepid = smime_invoke (NULL, NULL, NULL,
-1, fileno (fpout), fileno (fperr),
infile, NULL, NULL, NULL, NULL, NULL,
SmimePk7outCommand))== -1)
{
mutt_any_key_to_continue (_("Error: unable to create OpenSSL subprocess!"));
safe_fclose (&fperr);
safe_fclose (&fpout);
mutt_unlink (pk7out);
return NULL;
}
mutt_wait_filter (thepid);
fflush (fpout);
rewind (fpout);
fflush (fperr);
rewind (fperr);
empty = (fgetc (fpout) == EOF);
if (empty)
{
mutt_perror (pk7out);
mutt_copy_stream (fperr, stdout);
safe_fclose (&fpout);
safe_fclose (&fperr);
mutt_unlink (pk7out);
return NULL;
}
safe_fclose (&fpout);
mutt_mktemp (certfile, sizeof (certfile));
if ((fpout = safe_fopen (certfile, "w+")) == NULL)
{
safe_fclose (&fperr);
mutt_unlink (pk7out);
mutt_perror (certfile);
return NULL;
}
/* Step 2: Extract the certificates from a PKCS#7 structure.
*/
if ((thepid = smime_invoke (NULL, NULL, NULL,
-1, fileno (fpout), fileno (fperr),
pk7out, NULL, NULL, NULL, NULL, NULL,
SmimeGetCertCommand))== -1)
{
mutt_any_key_to_continue (_("Error: unable to create OpenSSL subprocess!"));
safe_fclose (&fperr);
safe_fclose (&fpout);
mutt_unlink (pk7out);
mutt_unlink (certfile);
return NULL;
}
mutt_wait_filter (thepid);
mutt_unlink (pk7out);
fflush (fpout);
rewind (fpout);
fflush (fperr);
rewind (fperr);
empty = (fgetc (fpout) == EOF);
if (empty)
{
mutt_copy_stream (fperr, stdout);
safe_fclose (&fpout);
safe_fclose (&fperr);
mutt_unlink (certfile);
return NULL;
}
safe_fclose (&fpout);
safe_fclose (&fperr);