mirror of git://git.gnupg.org/gnupg.git
1112 lines
32 KiB
C
1112 lines
32 KiB
C
/* certchain.c - certificate chain validation
|
||
* Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
|
||
*
|
||
* This file is part of GnuPG.
|
||
*
|
||
* GnuPG 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.
|
||
*
|
||
* GnuPG 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <errno.h>
|
||
#include <unistd.h>
|
||
#include <time.h>
|
||
#include <stdarg.h>
|
||
#include <assert.h>
|
||
|
||
#define JNLIB_NEED_LOG_LOGV /* We need log_logv. */
|
||
|
||
#include "gpgsm.h"
|
||
#include <gcrypt.h>
|
||
#include <ksba.h>
|
||
|
||
#include "keydb.h"
|
||
#include "../kbx/keybox.h" /* for KEYBOX_FLAG_* */
|
||
#include "i18n.h"
|
||
|
||
|
||
/* If LISTMODE is true, print FORMAT using LISTMODE to FP. If
|
||
LISTMODE is false, use the string to print an log_info or, if
|
||
IS_ERROR is true, and log_error. */
|
||
static void
|
||
do_list (int is_error, int listmode, FILE *fp, const char *format, ...)
|
||
{
|
||
va_list arg_ptr;
|
||
|
||
va_start (arg_ptr, format) ;
|
||
if (listmode)
|
||
{
|
||
if (fp)
|
||
{
|
||
fputs (" [", fp);
|
||
vfprintf (fp, format, arg_ptr);
|
||
fputs ("]\n", fp);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
log_logv (is_error? JNLIB_LOG_ERROR: JNLIB_LOG_INFO, format, arg_ptr);
|
||
log_printf ("\n");
|
||
}
|
||
va_end (arg_ptr);
|
||
}
|
||
|
||
/* Return 0 if A and B are equal. */
|
||
static int
|
||
compare_certs (ksba_cert_t a, ksba_cert_t b)
|
||
{
|
||
const unsigned char *img_a, *img_b;
|
||
size_t len_a, len_b;
|
||
|
||
img_a = ksba_cert_get_image (a, &len_a);
|
||
if (!img_a)
|
||
return 1;
|
||
img_b = ksba_cert_get_image (b, &len_b);
|
||
if (!img_b)
|
||
return 1;
|
||
return !(len_a == len_b && !memcmp (img_a, img_b, len_a));
|
||
}
|
||
|
||
|
||
static int
|
||
unknown_criticals (ksba_cert_t cert, int listmode, FILE *fp)
|
||
{
|
||
static const char *known[] = {
|
||
"2.5.29.15", /* keyUsage */
|
||
"2.5.29.19", /* basic Constraints */
|
||
"2.5.29.32", /* certificatePolicies */
|
||
"2.5.29.37", /* extendedKeyUsage - handled by certlist.c */
|
||
NULL
|
||
};
|
||
int rc = 0, i, idx, crit;
|
||
const char *oid;
|
||
gpg_error_t err;
|
||
|
||
for (idx=0; !(err=ksba_cert_get_extension (cert, idx,
|
||
&oid, &crit, NULL, NULL));idx++)
|
||
{
|
||
if (!crit)
|
||
continue;
|
||
for (i=0; known[i] && strcmp (known[i],oid); i++)
|
||
;
|
||
if (!known[i])
|
||
{
|
||
do_list (1, listmode, fp,
|
||
_("critical certificate extension %s is not supported"),
|
||
oid);
|
||
rc = gpg_error (GPG_ERR_UNSUPPORTED_CERT);
|
||
}
|
||
}
|
||
if (err && gpg_err_code (err) != GPG_ERR_EOF)
|
||
rc = err;
|
||
|
||
return rc;
|
||
}
|
||
|
||
static int
|
||
allowed_ca (ksba_cert_t cert, int *chainlen, int listmode, FILE *fp)
|
||
{
|
||
gpg_error_t err;
|
||
int flag;
|
||
|
||
err = ksba_cert_is_ca (cert, &flag, chainlen);
|
||
if (err)
|
||
return err;
|
||
if (!flag)
|
||
{
|
||
do_list (1, listmode, fp,_("issuer certificate is not marked as a CA"));
|
||
return gpg_error (GPG_ERR_BAD_CA_CERT);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
static int
|
||
check_cert_policy (ksba_cert_t cert, int listmode, FILE *fplist)
|
||
{
|
||
gpg_error_t err;
|
||
char *policies;
|
||
FILE *fp;
|
||
int any_critical;
|
||
|
||
err = ksba_cert_get_cert_policies (cert, &policies);
|
||
if (gpg_err_code (err) == GPG_ERR_NO_DATA)
|
||
return 0; /* no policy given */
|
||
if (err)
|
||
return err;
|
||
|
||
/* STRING is a line delimited list of certifiate policies as stored
|
||
in the certificate. The line itself is colon delimited where the
|
||
first field is the OID of the policy and the second field either
|
||
N or C for normal or critical extension */
|
||
|
||
if (opt.verbose > 1 && !listmode)
|
||
log_info ("certificate's policy list: %s\n", policies);
|
||
|
||
/* The check is very minimal but won't give false positives */
|
||
any_critical = !!strstr (policies, ":C");
|
||
|
||
if (!opt.policy_file)
|
||
{
|
||
xfree (policies);
|
||
if (any_critical)
|
||
{
|
||
do_list (1, listmode, fplist,
|
||
_("critical marked policy without configured policies"));
|
||
return gpg_error (GPG_ERR_NO_POLICY_MATCH);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
fp = fopen (opt.policy_file, "r");
|
||
if (!fp)
|
||
{
|
||
if (opt.verbose || errno != ENOENT)
|
||
log_info (_("failed to open `%s': %s\n"),
|
||
opt.policy_file, strerror (errno));
|
||
xfree (policies);
|
||
/* With no critical policies this is only a warning */
|
||
if (!any_critical)
|
||
{
|
||
do_list (0, listmode, fplist,
|
||
_("note: non-critical certificate policy not allowed"));
|
||
return 0;
|
||
}
|
||
do_list (1, listmode, fplist,
|
||
_("certificate policy not allowed"));
|
||
return gpg_error (GPG_ERR_NO_POLICY_MATCH);
|
||
}
|
||
|
||
for (;;)
|
||
{
|
||
int c;
|
||
char *p, line[256];
|
||
char *haystack, *allowed;
|
||
|
||
/* read line */
|
||
do
|
||
{
|
||
if (!fgets (line, DIM(line)-1, fp) )
|
||
{
|
||
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
|
||
|
||
xfree (policies);
|
||
if (feof (fp))
|
||
{
|
||
fclose (fp);
|
||
/* With no critical policies this is only a warning */
|
||
if (!any_critical)
|
||
{
|
||
do_list (0, listmode, fplist,
|
||
_("note: non-critical certificate policy not allowed"));
|
||
return 0;
|
||
}
|
||
do_list (1, listmode, fplist,
|
||
_("certificate policy not allowed"));
|
||
return gpg_error (GPG_ERR_NO_POLICY_MATCH);
|
||
}
|
||
fclose (fp);
|
||
return tmperr;
|
||
}
|
||
|
||
if (!*line || line[strlen(line)-1] != '\n')
|
||
{
|
||
/* eat until end of line */
|
||
while ( (c=getc (fp)) != EOF && c != '\n')
|
||
;
|
||
fclose (fp);
|
||
xfree (policies);
|
||
return gpg_error (*line? GPG_ERR_LINE_TOO_LONG
|
||
: GPG_ERR_INCOMPLETE_LINE);
|
||
}
|
||
|
||
/* Allow for empty lines and spaces */
|
||
for (p=line; spacep (p); p++)
|
||
;
|
||
}
|
||
while (!*p || *p == '\n' || *p == '#');
|
||
|
||
/* parse line */
|
||
for (allowed=line; spacep (allowed); allowed++)
|
||
;
|
||
p = strpbrk (allowed, " :\n");
|
||
if (!*p || p == allowed)
|
||
{
|
||
fclose (fp);
|
||
xfree (policies);
|
||
return gpg_error (GPG_ERR_CONFIGURATION);
|
||
}
|
||
*p = 0; /* strip the rest of the line */
|
||
/* See whether we find ALLOWED (which is an OID) in POLICIES */
|
||
for (haystack=policies; (p=strstr (haystack, allowed)); haystack = p+1)
|
||
{
|
||
if ( !(p == policies || p[-1] == '\n') )
|
||
continue; /* Does not match the begin of a line. */
|
||
if (p[strlen (allowed)] != ':')
|
||
continue; /* The length does not match. */
|
||
/* Yep - it does match so return okay. */
|
||
fclose (fp);
|
||
xfree (policies);
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/* Helper fucntion for find_up. This resets the key handle and search
|
||
for an issuer ISSUER with a subjectKeyIdentifier of KEYID. Returns
|
||
0 obn success or -1 when not found. */
|
||
static int
|
||
find_up_search_by_keyid (KEYDB_HANDLE kh,
|
||
const char *issuer, ksba_sexp_t keyid)
|
||
{
|
||
int rc;
|
||
ksba_cert_t cert = NULL;
|
||
ksba_sexp_t subj = NULL;
|
||
|
||
keydb_search_reset (kh);
|
||
while (!(rc = keydb_search_subject (kh, issuer)))
|
||
{
|
||
ksba_cert_release (cert); cert = NULL;
|
||
rc = keydb_get_cert (kh, &cert);
|
||
if (rc)
|
||
{
|
||
log_error ("keydb_get_cert() failed: rc=%d\n", rc);
|
||
rc = -1;
|
||
break;
|
||
}
|
||
xfree (subj);
|
||
if (!ksba_cert_get_subj_key_id (cert, NULL, &subj))
|
||
{
|
||
if (!cmp_simple_canon_sexp (keyid, subj))
|
||
break; /* Found matching cert. */
|
||
}
|
||
}
|
||
|
||
ksba_cert_release (cert);
|
||
xfree (subj);
|
||
return rc? -1:0;
|
||
}
|
||
|
||
|
||
static void
|
||
find_up_store_certs_cb (void *cb_value, ksba_cert_t cert)
|
||
{
|
||
if (keydb_store_cert (cert, 1, NULL))
|
||
log_error ("error storing issuer certificate as ephemeral\n");
|
||
++*(int*)cb_value;
|
||
}
|
||
|
||
|
||
/* Helper for find_up(). Locate the certificate for ISSUER using an
|
||
external lookup. KH is the keydb context we are currently using.
|
||
On success 0 is returned and the certificate may be retrieved from
|
||
the keydb using keydb_get_cert(). KEYID is the keyIdentifier from
|
||
the AKI or NULL. */
|
||
static int
|
||
find_up_external (KEYDB_HANDLE kh, const char *issuer, ksba_sexp_t keyid)
|
||
{
|
||
int rc;
|
||
strlist_t names = NULL;
|
||
int count = 0;
|
||
char *pattern;
|
||
const char *s;
|
||
|
||
if (opt.verbose)
|
||
log_info (_("looking up issuer at external location\n"));
|
||
/* The DIRMNGR process is confused about unknown attributes. As a
|
||
quick and ugly hack we locate the CN and use the issuer string
|
||
starting at this attribite. Fixme: we should have far better
|
||
parsing in the dirmngr. */
|
||
s = strstr (issuer, "CN=");
|
||
if (!s || s == issuer || s[-1] != ',')
|
||
s = issuer;
|
||
|
||
pattern = xtrymalloc (strlen (s)+2);
|
||
if (!pattern)
|
||
return gpg_error_from_errno (errno);
|
||
strcpy (stpcpy (pattern, "/"), s);
|
||
add_to_strlist (&names, pattern);
|
||
xfree (pattern);
|
||
|
||
rc = gpgsm_dirmngr_lookup (NULL, names, find_up_store_certs_cb, &count);
|
||
free_strlist (names);
|
||
|
||
if (opt.verbose)
|
||
log_info (_("number of issuers matching: %d\n"), count);
|
||
if (rc)
|
||
{
|
||
log_error ("external key lookup failed: %s\n", gpg_strerror (rc));
|
||
rc = -1;
|
||
}
|
||
else if (!count)
|
||
rc = -1;
|
||
else
|
||
{
|
||
int old;
|
||
/* The issuers are currently stored in the ephemeral key DB, so
|
||
we temporary switch to ephemeral mode. */
|
||
old = keydb_set_ephemeral (kh, 1);
|
||
if (keyid)
|
||
rc = find_up_search_by_keyid (kh, issuer, keyid);
|
||
else
|
||
{
|
||
keydb_search_reset (kh);
|
||
rc = keydb_search_subject (kh, issuer);
|
||
}
|
||
keydb_set_ephemeral (kh, old);
|
||
}
|
||
return rc;
|
||
}
|
||
|
||
|
||
/* Locate issuing certificate for CERT. ISSUER is the name of the
|
||
issuer used as a fallback if the other methods don't work. If
|
||
FIND_NEXT is true, the function shall return the next possible
|
||
issuer. The certificate itself is not directly returned but a
|
||
keydb_get_cert on the keyDb context KH will return it. Returns 0
|
||
on success, -1 if not found or an error code. */
|
||
static int
|
||
find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next)
|
||
{
|
||
ksba_name_t authid;
|
||
ksba_sexp_t authidno;
|
||
ksba_sexp_t keyid;
|
||
int rc = -1;
|
||
|
||
if (!ksba_cert_get_auth_key_id (cert, &keyid, &authid, &authidno))
|
||
{
|
||
const char *s = ksba_name_enum (authid, 0);
|
||
if (s && *authidno)
|
||
{
|
||
rc = keydb_search_issuer_sn (kh, s, authidno);
|
||
if (rc)
|
||
keydb_search_reset (kh);
|
||
|
||
/* In case of an error try the ephemeral DB. We can't do
|
||
that in find_next mode because we can't keep the search
|
||
state then. */
|
||
if (rc == -1 && !find_next)
|
||
{
|
||
int old = keydb_set_ephemeral (kh, 1);
|
||
if (!old)
|
||
{
|
||
rc = keydb_search_issuer_sn (kh, s, authidno);
|
||
if (rc)
|
||
keydb_search_reset (kh);
|
||
}
|
||
keydb_set_ephemeral (kh, old);
|
||
}
|
||
|
||
}
|
||
|
||
if (rc == -1 && keyid && !find_next)
|
||
{
|
||
/* Not found by AIK.issuer_sn. Lets try the AIY.ki
|
||
instead. Loop over all certificates with that issuer as
|
||
subject and stop for the one with a matching
|
||
subjectKeyIdentifier. */
|
||
rc = find_up_search_by_keyid (kh, issuer, keyid);
|
||
if (rc)
|
||
{
|
||
int old = keydb_set_ephemeral (kh, 1);
|
||
if (!old)
|
||
rc = find_up_search_by_keyid (kh, issuer, keyid);
|
||
keydb_set_ephemeral (kh, old);
|
||
}
|
||
if (rc)
|
||
rc = -1; /* Need to make sure to have this error code. */
|
||
}
|
||
|
||
/* If we still didn't found it, try an external lookup. */
|
||
if (rc == -1 && opt.auto_issuer_key_retrieve && !find_next)
|
||
rc = find_up_external (kh, issuer, keyid);
|
||
|
||
/* Print a note so that the user does not feel too helpless when
|
||
an issuer certificate was found and gpgsm prints BAD
|
||
signature because it is not the correct one. */
|
||
if (rc == -1)
|
||
{
|
||
log_info ("%sissuer certificate ", find_next?"next ":"");
|
||
if (keyid)
|
||
{
|
||
log_printf ("{");
|
||
gpgsm_dump_serial (keyid);
|
||
log_printf ("} ");
|
||
}
|
||
if (authidno)
|
||
{
|
||
log_printf ("(#");
|
||
gpgsm_dump_serial (authidno);
|
||
log_printf ("/");
|
||
gpgsm_dump_string (s);
|
||
log_printf (") ");
|
||
}
|
||
log_printf ("not found using authorityKeyIdentifier\n");
|
||
}
|
||
else if (rc)
|
||
log_error ("failed to find authorityKeyIdentifier: rc=%d\n", rc);
|
||
xfree (keyid);
|
||
ksba_name_release (authid);
|
||
xfree (authidno);
|
||
}
|
||
|
||
if (rc) /* Not found via authorithyKeyIdentifier, try regular issuer name. */
|
||
rc = keydb_search_subject (kh, issuer);
|
||
if (rc == -1 && !find_next)
|
||
{
|
||
/* Not found, lets see whether we have one in the ephemeral key DB. */
|
||
int old = keydb_set_ephemeral (kh, 1);
|
||
if (!old)
|
||
{
|
||
keydb_search_reset (kh);
|
||
rc = keydb_search_subject (kh, issuer);
|
||
}
|
||
keydb_set_ephemeral (kh, old);
|
||
}
|
||
|
||
/* Still not found. If enabled, try an external lookup. */
|
||
if (rc == -1 && opt.auto_issuer_key_retrieve && !find_next)
|
||
rc = find_up_external (kh, issuer, NULL);
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
/* Return the next certificate up in the chain starting at START.
|
||
Returns -1 when there are no more certificates. */
|
||
int
|
||
gpgsm_walk_cert_chain (ksba_cert_t start, ksba_cert_t *r_next)
|
||
{
|
||
int rc = 0;
|
||
char *issuer = NULL;
|
||
char *subject = NULL;
|
||
KEYDB_HANDLE kh = keydb_new (0);
|
||
|
||
*r_next = NULL;
|
||
if (!kh)
|
||
{
|
||
log_error (_("failed to allocated keyDB handle\n"));
|
||
rc = gpg_error (GPG_ERR_GENERAL);
|
||
goto leave;
|
||
}
|
||
|
||
issuer = ksba_cert_get_issuer (start, 0);
|
||
subject = ksba_cert_get_subject (start, 0);
|
||
if (!issuer)
|
||
{
|
||
log_error ("no issuer found in certificate\n");
|
||
rc = gpg_error (GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
if (!subject)
|
||
{
|
||
log_error ("no subject found in certificate\n");
|
||
rc = gpg_error (GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
|
||
if (!strcmp (issuer, subject))
|
||
{
|
||
rc = -1; /* we are at the root */
|
||
goto leave;
|
||
}
|
||
|
||
rc = find_up (kh, start, issuer, 0);
|
||
if (rc)
|
||
{
|
||
/* it is quite common not to have a certificate, so better don't
|
||
print an error here */
|
||
if (rc != -1 && opt.verbose > 1)
|
||
log_error ("failed to find issuer's certificate: rc=%d\n", rc);
|
||
rc = gpg_error (GPG_ERR_MISSING_CERT);
|
||
goto leave;
|
||
}
|
||
|
||
rc = keydb_get_cert (kh, r_next);
|
||
if (rc)
|
||
{
|
||
log_error ("keydb_get_cert() failed: rc=%d\n", rc);
|
||
rc = gpg_error (GPG_ERR_GENERAL);
|
||
}
|
||
|
||
leave:
|
||
xfree (issuer);
|
||
xfree (subject);
|
||
keydb_release (kh);
|
||
return rc;
|
||
}
|
||
|
||
|
||
/* Check whether the CERT is a root certificate. Returns True if this
|
||
is the case. */
|
||
int
|
||
gpgsm_is_root_cert (ksba_cert_t cert)
|
||
{
|
||
char *issuer;
|
||
char *subject;
|
||
int yes;
|
||
|
||
issuer = ksba_cert_get_issuer (cert, 0);
|
||
subject = ksba_cert_get_subject (cert, 0);
|
||
yes = (issuer && subject && !strcmp (issuer, subject));
|
||
xfree (issuer);
|
||
xfree (subject);
|
||
return yes;
|
||
}
|
||
|
||
|
||
/* This is a helper for gpgsm_validate_chain. */
|
||
static gpg_error_t
|
||
is_cert_still_valid (ctrl_t ctrl, int lm, FILE *fp,
|
||
ksba_cert_t subject_cert, ksba_cert_t issuer_cert,
|
||
int *any_revoked, int *any_no_crl, int *any_crl_too_old)
|
||
{
|
||
if (!opt.no_crl_check || ctrl->use_ocsp)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
err = gpgsm_dirmngr_isvalid (ctrl,
|
||
subject_cert, issuer_cert, ctrl->use_ocsp);
|
||
if (err)
|
||
{
|
||
/* Fixme: We should change the wording because we may
|
||
have used OCSP. */
|
||
switch (gpg_err_code (err))
|
||
{
|
||
case GPG_ERR_CERT_REVOKED:
|
||
do_list (1, lm, fp, _("certificate has been revoked"));
|
||
*any_revoked = 1;
|
||
/* Store that in the keybox so that key listings are
|
||
able to return the revoked flag. We don't care
|
||
about error, though. */
|
||
keydb_set_cert_flags (subject_cert, KEYBOX_FLAG_VALIDITY, 0,
|
||
VALIDITY_REVOKED);
|
||
break;
|
||
case GPG_ERR_NO_CRL_KNOWN:
|
||
do_list (1, lm, fp, _("no CRL found for certificate"));
|
||
*any_no_crl = 1;
|
||
break;
|
||
case GPG_ERR_CRL_TOO_OLD:
|
||
do_list (1, lm, fp, _("the available CRL is too old"));
|
||
if (!lm)
|
||
log_info (_("please make sure that the "
|
||
"\"dirmngr\" is properly installed\n"));
|
||
*any_crl_too_old = 1;
|
||
break;
|
||
default:
|
||
do_list (1, lm, fp, _("checking the CRL failed: %s"),
|
||
gpg_strerror (err));
|
||
return err;
|
||
}
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/* Validate a chain and optionally return the nearest expiration time
|
||
in R_EXPTIME. With LISTMODE set to 1 a special listmode is
|
||
activated where only information about the certificate is printed
|
||
to FP and no output is send to the usual log stream.
|
||
|
||
Defined flag bits: 0 - do not do any dirmngr isvalid checks.
|
||
*/
|
||
int
|
||
gpgsm_validate_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t r_exptime,
|
||
int listmode, FILE *fp, unsigned int flags)
|
||
{
|
||
int rc = 0, depth = 0, maxdepth;
|
||
char *issuer = NULL;
|
||
char *subject = NULL;
|
||
KEYDB_HANDLE kh = NULL;
|
||
ksba_cert_t subject_cert = NULL, issuer_cert = NULL;
|
||
ksba_isotime_t current_time;
|
||
ksba_isotime_t exptime;
|
||
int any_expired = 0;
|
||
int any_revoked = 0;
|
||
int any_no_crl = 0;
|
||
int any_crl_too_old = 0;
|
||
int any_no_policy_match = 0;
|
||
int lm = listmode;
|
||
|
||
gnupg_get_isotime (current_time);
|
||
if (r_exptime)
|
||
*r_exptime = 0;
|
||
*exptime = 0;
|
||
|
||
if (opt.no_chain_validation && !listmode)
|
||
{
|
||
log_info ("WARNING: bypassing certificate chain validation\n");
|
||
return 0;
|
||
}
|
||
|
||
kh = keydb_new (0);
|
||
if (!kh)
|
||
{
|
||
log_error (_("failed to allocated keyDB handle\n"));
|
||
rc = gpg_error (GPG_ERR_GENERAL);
|
||
goto leave;
|
||
}
|
||
|
||
if (DBG_X509 && !listmode)
|
||
gpgsm_dump_cert ("target", cert);
|
||
|
||
subject_cert = cert;
|
||
maxdepth = 50;
|
||
|
||
for (;;)
|
||
{
|
||
xfree (issuer);
|
||
xfree (subject);
|
||
issuer = ksba_cert_get_issuer (subject_cert, 0);
|
||
subject = ksba_cert_get_subject (subject_cert, 0);
|
||
|
||
if (!issuer)
|
||
{
|
||
do_list (1, lm, fp, _("no issuer found in certificate"));
|
||
rc = gpg_error (GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
|
||
{
|
||
ksba_isotime_t not_before, not_after;
|
||
|
||
rc = ksba_cert_get_validity (subject_cert, 0, not_before);
|
||
if (!rc)
|
||
rc = ksba_cert_get_validity (subject_cert, 1, not_after);
|
||
if (rc)
|
||
{
|
||
do_list (1, lm, fp, _("certificate with invalid validity: %s"),
|
||
gpg_strerror (rc));
|
||
rc = gpg_error (GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
|
||
if (*not_after)
|
||
{
|
||
if (!*exptime)
|
||
gnupg_copy_time (exptime, not_after);
|
||
else if (strcmp (not_after, exptime) < 0 )
|
||
gnupg_copy_time (exptime, not_after);
|
||
}
|
||
|
||
if (*not_before && strcmp (current_time, not_before) < 0 )
|
||
{
|
||
do_list (1, lm, fp, _("certificate not yet valid"));
|
||
if (!lm)
|
||
{
|
||
log_info ("(valid from ");
|
||
gpgsm_dump_time (not_before);
|
||
log_printf (")\n");
|
||
}
|
||
rc = gpg_error (GPG_ERR_CERT_TOO_YOUNG);
|
||
goto leave;
|
||
}
|
||
if (*not_after && strcmp (current_time, not_after) > 0 )
|
||
{
|
||
do_list (opt.ignore_expiration?0:1, lm, fp,
|
||
_("certificate has expired"));
|
||
if (!lm)
|
||
{
|
||
log_info ("(expired at ");
|
||
gpgsm_dump_time (not_after);
|
||
log_printf (")\n");
|
||
}
|
||
if (opt.ignore_expiration)
|
||
log_info ("WARNING: ignoring expiration\n");
|
||
else
|
||
any_expired = 1;
|
||
}
|
||
}
|
||
|
||
rc = unknown_criticals (subject_cert, listmode, fp);
|
||
if (rc)
|
||
goto leave;
|
||
|
||
if (!opt.no_policy_check)
|
||
{
|
||
rc = check_cert_policy (subject_cert, listmode, fp);
|
||
if (gpg_err_code (rc) == GPG_ERR_NO_POLICY_MATCH)
|
||
{
|
||
any_no_policy_match = 1;
|
||
rc = 1;
|
||
}
|
||
else if (rc)
|
||
goto leave;
|
||
}
|
||
|
||
|
||
/* Is this a self-issued certificate? */
|
||
if (subject && !strcmp (issuer, subject))
|
||
{ /* Yes. */
|
||
if (gpgsm_check_cert_sig (subject_cert, subject_cert) )
|
||
{
|
||
do_list (1, lm, fp,
|
||
_("self-signed certificate has a BAD signature"));
|
||
if (DBG_X509)
|
||
{
|
||
gpgsm_dump_cert ("self-signing cert", subject_cert);
|
||
}
|
||
rc = gpg_error (depth? GPG_ERR_BAD_CERT_CHAIN
|
||
: GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
rc = allowed_ca (subject_cert, NULL, listmode, fp);
|
||
if (rc)
|
||
goto leave;
|
||
|
||
rc = gpgsm_agent_istrusted (ctrl, subject_cert);
|
||
if (!rc)
|
||
;
|
||
else if (gpg_err_code (rc) == GPG_ERR_NOT_TRUSTED)
|
||
{
|
||
do_list (0, lm, fp, _("root certificate is not marked trusted"));
|
||
/* If we already figured out that the certificate is
|
||
expired it does not make much sense to ask the user
|
||
whether we wants to trust the root certificate. He
|
||
should do this only if the certificate under question
|
||
will then be usable. */
|
||
if (!lm && !any_expired)
|
||
{
|
||
int rc2;
|
||
char *fpr = gpgsm_get_fingerprint_string (subject_cert,
|
||
GCRY_MD_SHA1);
|
||
log_info (_("fingerprint=%s\n"), fpr? fpr : "?");
|
||
xfree (fpr);
|
||
rc2 = gpgsm_agent_marktrusted (ctrl, subject_cert);
|
||
if (!rc2)
|
||
{
|
||
log_info (_("root certificate has now"
|
||
" been marked as trusted\n"));
|
||
rc = 0;
|
||
}
|
||
else
|
||
{
|
||
gpgsm_dump_cert ("issuer", subject_cert);
|
||
log_info ("after checking the fingerprint, you may want "
|
||
"to add it manually to the list of trusted "
|
||
"certificates.\n");
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
log_error (_("checking the trust list failed: %s\n"),
|
||
gpg_strerror (rc));
|
||
}
|
||
|
||
if (rc)
|
||
goto leave;
|
||
|
||
/* Check for revocations etc. */
|
||
if ((flags & 1))
|
||
;
|
||
else if (opt.no_trusted_cert_crl_check)
|
||
;
|
||
else
|
||
rc = is_cert_still_valid (ctrl, lm, fp,
|
||
subject_cert, subject_cert,
|
||
&any_revoked, &any_no_crl,
|
||
&any_crl_too_old);
|
||
if (rc)
|
||
goto leave;
|
||
|
||
break; /* Okay: a self-signed certicate is an end-point. */
|
||
}
|
||
|
||
depth++;
|
||
if (depth > maxdepth)
|
||
{
|
||
do_list (1, lm, fp, _("certificate chain too long\n"));
|
||
rc = gpg_error (GPG_ERR_BAD_CERT_CHAIN);
|
||
goto leave;
|
||
}
|
||
|
||
/* find the next cert up the tree */
|
||
keydb_search_reset (kh);
|
||
rc = find_up (kh, subject_cert, issuer, 0);
|
||
if (rc)
|
||
{
|
||
if (rc == -1)
|
||
{
|
||
do_list (0, lm, fp, _("issuer certificate not found"));
|
||
if (!lm)
|
||
{
|
||
log_info ("issuer certificate: #/");
|
||
gpgsm_dump_string (issuer);
|
||
log_printf ("\n");
|
||
}
|
||
}
|
||
else
|
||
log_error ("failed to find issuer's certificate: rc=%d\n", rc);
|
||
rc = gpg_error (GPG_ERR_MISSING_CERT);
|
||
goto leave;
|
||
}
|
||
|
||
ksba_cert_release (issuer_cert); issuer_cert = NULL;
|
||
rc = keydb_get_cert (kh, &issuer_cert);
|
||
if (rc)
|
||
{
|
||
log_error ("keydb_get_cert() failed: rc=%d\n", rc);
|
||
rc = gpg_error (GPG_ERR_GENERAL);
|
||
goto leave;
|
||
}
|
||
|
||
try_another_cert:
|
||
if (DBG_X509)
|
||
{
|
||
log_debug ("got issuer's certificate:\n");
|
||
gpgsm_dump_cert ("issuer", issuer_cert);
|
||
}
|
||
|
||
rc = gpgsm_check_cert_sig (issuer_cert, subject_cert);
|
||
if (rc)
|
||
{
|
||
do_list (0, lm, fp, _("certificate has a BAD signature"));
|
||
if (DBG_X509)
|
||
{
|
||
gpgsm_dump_cert ("signing issuer", issuer_cert);
|
||
gpgsm_dump_cert ("signed subject", subject_cert);
|
||
}
|
||
if (gpg_err_code (rc) == GPG_ERR_BAD_SIGNATURE)
|
||
{
|
||
/* We now try to find other issuer certificates which
|
||
might have been used. This is required because some
|
||
CAs are reusing the issuer and subject DN for new
|
||
root certificates. */
|
||
/* FIXME: Do this only if we don't have an
|
||
AKI.keyIdentifier */
|
||
rc = find_up (kh, subject_cert, issuer, 1);
|
||
if (!rc)
|
||
{
|
||
ksba_cert_t tmp_cert;
|
||
|
||
rc = keydb_get_cert (kh, &tmp_cert);
|
||
if (rc || !compare_certs (issuer_cert, tmp_cert))
|
||
{
|
||
/* The find next did not work or returned an
|
||
identical certificate. We better stop here
|
||
to avoid infinite checks. */
|
||
rc = gpg_error (GPG_ERR_BAD_SIGNATURE);
|
||
ksba_cert_release (tmp_cert);
|
||
}
|
||
else
|
||
{
|
||
do_list (0, lm, fp, _("found another possible matching "
|
||
"CA certificate - trying again"));
|
||
ksba_cert_release (issuer_cert);
|
||
issuer_cert = tmp_cert;
|
||
goto try_another_cert;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* We give a more descriptive error code than the one
|
||
returned from the signature checking. */
|
||
rc = gpg_error (GPG_ERR_BAD_CERT_CHAIN);
|
||
goto leave;
|
||
}
|
||
|
||
{
|
||
int chainlen;
|
||
rc = allowed_ca (issuer_cert, &chainlen, listmode, fp);
|
||
if (rc)
|
||
goto leave;
|
||
if (chainlen >= 0 && (depth - 1) > chainlen)
|
||
{
|
||
do_list (1, lm, fp,
|
||
_("certificate chain longer than allowed by CA (%d)"),
|
||
chainlen);
|
||
rc = gpg_error (GPG_ERR_BAD_CERT_CHAIN);
|
||
goto leave;
|
||
}
|
||
}
|
||
|
||
if (!listmode)
|
||
{
|
||
rc = gpgsm_cert_use_cert_p (issuer_cert);
|
||
if (rc)
|
||
{
|
||
char numbuf[50];
|
||
sprintf (numbuf, "%d", rc);
|
||
gpgsm_status2 (ctrl, STATUS_ERROR, "certcert.issuer.keyusage",
|
||
numbuf, NULL);
|
||
goto leave;
|
||
}
|
||
}
|
||
|
||
/* Check for revocations etc. */
|
||
if ((flags & 1))
|
||
rc = 0;
|
||
else
|
||
rc = is_cert_still_valid (ctrl, lm, fp,
|
||
subject_cert, issuer_cert,
|
||
&any_revoked, &any_no_crl, &any_crl_too_old);
|
||
if (rc)
|
||
goto leave;
|
||
|
||
|
||
if (opt.verbose && !listmode)
|
||
log_info ("certificate is good\n");
|
||
|
||
keydb_search_reset (kh);
|
||
subject_cert = issuer_cert;
|
||
issuer_cert = NULL;
|
||
}
|
||
|
||
if (!listmode)
|
||
{
|
||
if (opt.no_policy_check)
|
||
log_info ("policies not checked due to %s option\n",
|
||
"--disable-policy-checks");
|
||
if (opt.no_crl_check && !ctrl->use_ocsp)
|
||
log_info ("CRLs not checked due to %s option\n",
|
||
"--disable-crl-checks");
|
||
}
|
||
|
||
if (!rc)
|
||
{ /* If we encountered an error somewhere during the checks, set
|
||
the error code to the most critical one */
|
||
if (any_revoked)
|
||
rc = gpg_error (GPG_ERR_CERT_REVOKED);
|
||
else if (any_expired)
|
||
rc = gpg_error (GPG_ERR_CERT_EXPIRED);
|
||
else if (any_no_crl)
|
||
rc = gpg_error (GPG_ERR_NO_CRL_KNOWN);
|
||
else if (any_crl_too_old)
|
||
rc = gpg_error (GPG_ERR_CRL_TOO_OLD);
|
||
else if (any_no_policy_match)
|
||
rc = gpg_error (GPG_ERR_NO_POLICY_MATCH);
|
||
}
|
||
|
||
leave:
|
||
if (r_exptime)
|
||
gnupg_copy_time (r_exptime, exptime);
|
||
xfree (issuer);
|
||
keydb_release (kh);
|
||
ksba_cert_release (issuer_cert);
|
||
if (subject_cert != cert)
|
||
ksba_cert_release (subject_cert);
|
||
return rc;
|
||
}
|
||
|
||
|
||
/* Check that the given certificate is valid but DO NOT check any
|
||
constraints. We assume that the issuers certificate is already in
|
||
the DB and that this one is valid; which it should be because it
|
||
has been checked using this function. */
|
||
int
|
||
gpgsm_basic_cert_check (ksba_cert_t cert)
|
||
{
|
||
int rc = 0;
|
||
char *issuer = NULL;
|
||
char *subject = NULL;
|
||
KEYDB_HANDLE kh = keydb_new (0);
|
||
ksba_cert_t issuer_cert = NULL;
|
||
|
||
if (opt.no_chain_validation)
|
||
{
|
||
log_info ("WARNING: bypassing basic certificate checks\n");
|
||
return 0;
|
||
}
|
||
|
||
if (!kh)
|
||
{
|
||
log_error (_("failed to allocated keyDB handle\n"));
|
||
rc = gpg_error (GPG_ERR_GENERAL);
|
||
goto leave;
|
||
}
|
||
|
||
issuer = ksba_cert_get_issuer (cert, 0);
|
||
subject = ksba_cert_get_subject (cert, 0);
|
||
if (!issuer)
|
||
{
|
||
log_error ("no issuer found in certificate\n");
|
||
rc = gpg_error (GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
|
||
if (subject && !strcmp (issuer, subject))
|
||
{
|
||
rc = gpgsm_check_cert_sig (cert, cert);
|
||
if (rc)
|
||
{
|
||
log_error ("self-signed certificate has a BAD signature: %s\n",
|
||
gpg_strerror (rc));
|
||
if (DBG_X509)
|
||
{
|
||
gpgsm_dump_cert ("self-signing cert", cert);
|
||
}
|
||
rc = gpg_error (GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Find the next cert up the tree. */
|
||
keydb_search_reset (kh);
|
||
rc = find_up (kh, cert, issuer, 0);
|
||
if (rc)
|
||
{
|
||
if (rc == -1)
|
||
{
|
||
log_info ("issuer certificate (#/");
|
||
gpgsm_dump_string (issuer);
|
||
log_printf (") not found\n");
|
||
}
|
||
else
|
||
log_error ("failed to find issuer's certificate: rc=%d\n", rc);
|
||
rc = gpg_error (GPG_ERR_MISSING_CERT);
|
||
goto leave;
|
||
}
|
||
|
||
ksba_cert_release (issuer_cert); issuer_cert = NULL;
|
||
rc = keydb_get_cert (kh, &issuer_cert);
|
||
if (rc)
|
||
{
|
||
log_error ("keydb_get_cert() failed: rc=%d\n", rc);
|
||
rc = gpg_error (GPG_ERR_GENERAL);
|
||
goto leave;
|
||
}
|
||
|
||
rc = gpgsm_check_cert_sig (issuer_cert, cert);
|
||
if (rc)
|
||
{
|
||
log_error ("certificate has a BAD signature: %s\n",
|
||
gpg_strerror (rc));
|
||
if (DBG_X509)
|
||
{
|
||
gpgsm_dump_cert ("signing issuer", issuer_cert);
|
||
gpgsm_dump_cert ("signed subject", cert);
|
||
}
|
||
rc = gpg_error (GPG_ERR_BAD_CERT);
|
||
goto leave;
|
||
}
|
||
if (opt.verbose)
|
||
log_info ("certificate is good\n");
|
||
}
|
||
|
||
leave:
|
||
xfree (issuer);
|
||
keydb_release (kh);
|
||
ksba_cert_release (issuer_cert);
|
||
return rc;
|
||
}
|
||
|