static void
print_imported_status (ctrl_t ctrl, ksba_cert_t cert, int new_cert)
{
char *fpr;
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
if (new_cert)
gpgsm_status2 (ctrl, STATUS_IMPORTED, fpr, "[X.509]", NULL);
gpgsm_status2 (ctrl, STATUS_IMPORT_OK,
new_cert? "1":"0", fpr, NULL);
xfree (fpr);
}
/* Return fingerprint and a percent escaped name in a human readable
format suitable for status messages like GOODSIG. May return NULL
on error (out of core). */
char *
gpgsm_fpr_and_name_for_status (ksba_cert_t cert)
{
char *fpr, *name, *p;
char *buffer;
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
if (!fpr)
return NULL;
name = ksba_cert_get_subject (cert, 0);
if (!name)
{
xfree (fpr);
return NULL;
}
p = gpgsm_format_name2 (name, 0);
ksba_free (name);
name = p;
if (!name)
{
xfree (fpr);
return NULL;
}
buffer = xtrymalloc (strlen (fpr) + 1 + 3*strlen (name) + 1);
if (buffer)
{
const char *s;
p = stpcpy (stpcpy (buffer, fpr), " ");
for (s = name; *s; s++)
{
if (*s < ' ')
{
sprintf (p, "%%%02X", *(const unsigned char*)s);
p += 3;
}
else
*p++ = *s;
}
*p = 0;
}
xfree (fpr);
xfree (name);
return buffer;
}
/* Print an IMPORT_PROBLEM status. REASON is one of:
0 := "No specific reason given".
1 := "Invalid Certificate".
2 := "Issuer Certificate missing".
3 := "Certificate Chain too long".
4 := "Error storing certificate".
*/
static void
print_import_problem (ctrl_t ctrl, ksba_cert_t cert, int reason)
{
char *fpr = NULL;
char buf[25];
int i;
sprintf (buf, "%d", reason);
if (cert)
{
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
/* detetect an error (all high) value */
for (i=0; fpr[i] == 'F'; i++)
;
if (!fpr[i])
{
xfree (fpr);
fpr = NULL;
}
}
gpgsm_status2 (ctrl, STATUS_IMPORT_PROBLEM, buf, fpr, NULL);
xfree (fpr);
}
/* Call the directory manager to check whether the certificate is valid
Returns 0 for valid or usually one of the errors:
GPG_ERR_CERTIFICATE_REVOKED
GPG_ERR_NO_CRL_KNOWN
GPG_ERR_CRL_TOO_OLD
Values for USE_OCSP:
0 = Do CRL check.
1 = Do an OCSP check.
2 = Do an OCSP check using only the default responder.
*/
int
gpgsm_dirmngr_isvalid (ctrl_t ctrl,
ksba_cert_t cert, ksba_cert_t issuer_cert, int use_ocsp)
{
static int did_options;
int rc;
char *certid;
char line[ASSUAN_LINELENGTH];
struct inq_certificate_parm_s parm;
struct isvalid_status_parm_s stparm;
rc = start_dirmngr (ctrl);
if (rc)
return rc;
if (use_ocsp)
{
certid = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
}
else
{
certid = gpgsm_get_certid (cert);
if (!certid)
{
log_error ("error getting the certificate ID\n");
release_dirmngr (ctrl);
return gpg_error (GPG_ERR_GENERAL);
}
}
if (opt.verbose > 1)
{
char *fpr = gpgsm_get_fingerprint_string (cert, GCRY_MD_SHA1);
log_info ("asking dirmngr about %s%s\n", fpr,
use_ocsp? " (using OCSP)":"");
xfree (fpr);
}
parm.ctx = dirmngr_ctx;
parm.ctrl = ctrl;
parm.cert = cert;
parm.issuer_cert = issuer_cert;
stparm.ctrl = ctrl;
stparm.seen = 0;
memset (stparm.fpr, 0, 20);
/* FIXME: If --disable-crl-checks has been set, we should pass an
option to dirmngr, so that no fallback CRL check is done after an
ocsp check. It is not a problem right now as dirmngr does not
fallback to CRL checking. */
/* It is sufficient to send the options only once because we have
one connection per process only. */
if (!did_options)
{
if (opt.force_crl_refresh)
assuan_transact (dirmngr_ctx, "OPTION force-crl-refresh=1",
NULL, NULL, NULL, NULL, NULL, NULL);
did_options = 1;
}
snprintf (line, DIM(line)-1, "ISVALID%s %s",
use_ocsp == 2? " --only-ocsp --force-default-responder":"",
certid);
line[DIM(line)-1] = 0;
xfree (certid);
rc = assuan_transact (dirmngr_ctx, line, NULL, NULL,
inq_certificate, &parm,
isvalid_status_cb, &stparm);
if (opt.verbose > 1)
log_info ("response of dirmngr: %s\n", rc? gpg_strerror (rc): "okay");
rc = rc;
if (!rc && stparm.seen)
{
/* Need to also check the certificate validity. */
if (stparm.seen != 1)
{
log_error ("communication problem with dirmngr detected\n");
rc = gpg_error (GPG_ERR_INV_CRL);
}
else
{
KEYDB_HANDLE kh;
ksba_cert_t rspcert = NULL;
/* Fixme: First try to get the certificate from the
dirmngr's cache - it should be there. */
kh = keydb_new (0);
if (!kh)
rc = gpg_error (GPG_ERR_ENOMEM);
if (!rc)
rc = keydb_search_fpr (kh, stparm.fpr);
if (!rc)
rc = keydb_get_cert (kh, &rspcert);
if (rc)
{
log_error ("unable to find the certificate used "
"by the dirmngr: %s\n", gpg_strerror (rc));
rc = gpg_error (GPG_ERR_INV_CRL);
}
keydb_release (kh);
if (!rc)
{
rc = gpgsm_cert_use_ocsp_p (rspcert);
if (rc)
rc = gpg_error (GPG_ERR_INV_CRL);
else
{
/* Note the no_dirmngr flag: This avoids checking
this certificate over and over again. */
rc = gpgsm_validate_chain (ctrl, rspcert, "", NULL, 0, NULL,
VALIDATE_FLAG_NO_DIRMNGR, NULL);
if (rc)
{
log_error ("invalid certificate used for CRL/OCSP: %s\n",
gpg_strerror (rc));
rc = gpg_error (GPG_ERR_INV_CRL);
}
}
}
ksba_cert_release (rspcert);
}
}
release_dirmngr (ctrl);
return rc;
}
/* Perform a verify operation. To verify detached signatures, data_fd
must be different than -1. With OUT_FP given and a non-detached
signature, the signed material is written to that stream. */
int
gpgsm_verify (ctrl_t ctrl, int in_fd, int data_fd, FILE *out_fp)
{
int i, rc;
Base64Context b64reader = NULL;
Base64Context b64writer = NULL;
ksba_reader_t reader;
ksba_writer_t writer = NULL;
ksba_cms_t cms = NULL;
ksba_stop_reason_t stopreason;
ksba_cert_t cert;
KEYDB_HANDLE kh;
gcry_md_hd_t data_md = NULL;
int signer;
const char *algoid;
int algo;
int is_detached;
FILE *fp = NULL;
char *p;
audit_set_type (ctrl->audit, AUDIT_TYPE_VERIFY);
kh = keydb_new (0);
if (!kh)
{
log_error (_("failed to allocated keyDB handle\n"));
rc = gpg_error (GPG_ERR_GENERAL);
goto leave;
}
fp = fdopen ( dup (in_fd), "rb");
if (!fp)
{
rc = gpg_error (gpg_err_code_from_errno (errno));
log_error ("fdopen() failed: %s\n", strerror (errno));
goto leave;
}
rc = gpgsm_create_reader (&b64reader, ctrl, fp, 0, &reader);
if (rc)
{
log_error ("can't create reader: %s\n", gpg_strerror (rc));
goto leave;
}
if (out_fp)
{
rc = gpgsm_create_writer (&b64writer, ctrl, out_fp, NULL, &writer);
if (rc)
{
log_error ("can't create writer: %s\n", gpg_strerror (rc));
goto leave;
}
}
rc = ksba_cms_new (&cms);
if (rc)
goto leave;
rc = ksba_cms_set_reader_writer (cms, reader, writer);
if (rc)
{
log_error ("ksba_cms_set_reader_writer failed: %s\n",
gpg_strerror (rc));
goto leave;
}
rc = gcry_md_open (&data_md, 0, 0);
if (rc)
{
log_error ("md_open failed: %s\n", gpg_strerror (rc));
goto leave;
}
if (DBG_HASHING)
gcry_md_start_debug (data_md, "vrfy.data");
audit_log (ctrl->audit, AUDIT_SETUP_READY);
is_detached = 0;
do
{
rc = ksba_cms_parse (cms, &stopreason);
if (rc)
{
log_error ("ksba_cms_parse failed: %s\n", gpg_strerror (rc));
goto leave;
}
if (stopreason == KSBA_SR_NEED_HASH)
{
is_detached = 1;
audit_log (ctrl->audit, AUDIT_DETACHED_SIGNATURE);
if (opt.verbose)
log_info ("detached signature\n");
}
if (stopreason == KSBA_SR_NEED_HASH
|| stopreason == KSBA_SR_BEGIN_DATA)
{
audit_log (ctrl->audit, AUDIT_GOT_DATA);
/* We are now able to enable the hash algorithms */
for (i=0; (algoid=ksba_cms_get_digest_algo_list (cms, i)); i++)
{
algo = gcry_md_map_name (algoid);
if (!algo)
{
log_error ("unknown hash algorithm `%s'\n",
algoid? algoid:"?");
if (algoid
&& ( !strcmp (algoid, "1.2.840.113549.1.1.2")
||!strcmp (algoid, "1.2.840.113549.2.2")))
log_info (_("(this is the MD2 algorithm)\n"));
audit_log_s (ctrl->audit, AUDIT_BAD_DATA_HASH_ALGO, algoid);
}
else
{
if (DBG_X509)
log_debug ("enabling hash algorithm %d (%s)\n",
algo, algoid? algoid:"");
gcry_md_enable (data_md, algo);
audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
}
}
if (opt.extra_digest_algo)
{
if (DBG_X509)
log_debug ("enabling extra hash algorithm %d\n",
opt.extra_digest_algo);
gcry_md_enable (data_md, opt.extra_digest_algo);
audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO,
opt.extra_digest_algo);
}
if (is_detached)
{
if (data_fd == -1)
{
log_info ("detached signature w/o data "
"- assuming certs-only\n");
audit_log (ctrl->audit, AUDIT_CERT_ONLY_SIG);
}
else
audit_log_ok (ctrl->audit, AUDIT_DATA_HASHING,
hash_data (data_fd, data_md));
}
else
{
ksba_cms_set_hash_function (cms, HASH_FNC, data_md);
}
}
else if (stopreason == KSBA_SR_END_DATA)
{ /* The data bas been hashed */
audit_log_ok (ctrl->audit, AUDIT_DATA_HASHING, 0);
}
}
while (stopreason != KSBA_SR_READY);
if (b64writer)
{
rc = gpgsm_finish_writer (b64writer);
if (rc)
{
log_error ("write failed: %s\n", gpg_strerror (rc));
audit_log_ok (ctrl->audit, AUDIT_WRITE_ERROR, rc);
goto leave;
}
}
if (data_fd != -1 && !is_detached)
{
log_error ("data given for a non-detached signature\n");
rc = gpg_error (GPG_ERR_CONFLICT);
audit_log (ctrl->audit, AUDIT_USAGE_ERROR);
goto leave;
}
for (i=0; (cert=ksba_cms_get_cert (cms, i)); i++)
{
/* Fixme: it might be better to check the validity of the
certificate first before entering it into the DB. This way
we would avoid cluttering the DB with invalid
certificates. */
audit_log_cert (ctrl->audit, AUDIT_SAVE_CERT, cert,
keydb_store_cert (cert, 0, NULL));
ksba_cert_release (cert);
}
cert = NULL;
for (signer=0; ; signer++)
{
char *issuer = NULL;
ksba_sexp_t sigval = NULL;
ksba_isotime_t sigtime, keyexptime;
ksba_sexp_t serial;
char *msgdigest = NULL;
size_t msgdigestlen;
char *ctattr;
int sigval_hash_algo;
int info_pkalgo;
unsigned int verifyflags;
rc = ksba_cms_get_issuer_serial (cms, signer, &issuer, &serial);
if (!signer && gpg_err_code (rc) == GPG_ERR_NO_DATA
&& data_fd == -1 && is_detached)
{
log_info ("certs-only message accepted\n");
rc = 0;
break;
}
if (rc)
{
if (signer && rc == -1)
rc = 0;
break;
}
gpgsm_status (ctrl, STATUS_NEWSIG, NULL);
audit_log_i (ctrl->audit, AUDIT_NEW_SIG, signer);
if (DBG_X509)
{
log_debug ("signer %d - issuer: `%s'\n",
signer, issuer? issuer:"[NONE]");
log_debug ("signer %d - serial: ", signer);
gpgsm_dump_serial (serial);
log_printf ("\n");
}
if (ctrl->audit)
{
char *tmpstr = gpgsm_format_sn_issuer (serial, issuer);
audit_log_s (ctrl->audit, AUDIT_SIG_NAME, tmpstr);
xfree (tmpstr);
}
rc = ksba_cms_get_signing_time (cms, signer, sigtime);
if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
*sigtime = 0;
else if (rc)
{
log_error ("error getting signing time: %s\n", gpg_strerror (rc));
*sigtime = 0; /* (we can't encode an error in the time string.) */
}
rc = ksba_cms_get_message_digest (cms, signer,
&msgdigest, &msgdigestlen);
if (!rc)
{
size_t is_enabled;
algoid = ksba_cms_get_digest_algo (cms, signer);
algo = gcry_md_map_name (algoid);
if (DBG_X509)
log_debug ("signer %d - digest algo: %d\n", signer, algo);
is_enabled = sizeof algo;
if ( gcry_md_info (data_md, GCRYCTL_IS_ALGO_ENABLED,
&algo, &is_enabled)
|| !is_enabled)
{
log_error ("digest algo %d (%s) has not been enabled\n",
algo, algoid?algoid:"");
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "unsupported");
goto next_signer;
}
}
else if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
{
assert (!msgdigest);
rc = 0;
algoid = NULL;
algo = 0;
}
else /* real error */
{
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
break;
}
rc = ksba_cms_get_sigattr_oids (cms, signer,
"1.2.840.113549.1.9.3", &ctattr);
if (!rc)
{
const char *s;
if (DBG_X509)
log_debug ("signer %d - content-type attribute: %s",
signer, ctattr);
s = ksba_cms_get_content_oid (cms, 1);
if (!s || strcmp (ctattr, s))
{
log_error ("content-type attribute does not match "
"actual content-type\n");
ksba_free (ctattr);
ctattr = NULL;
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
goto next_signer;
}
ksba_free (ctattr);
ctattr = NULL;
}
else if (rc != -1)
{
log_error ("error getting content-type attribute: %s\n",
gpg_strerror (rc));
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
goto next_signer;
}
rc = 0;
sigval = ksba_cms_get_sig_val (cms, signer);
if (!sigval)
{
log_error ("no signature value available\n");
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
goto next_signer;
}
sigval_hash_algo = hash_algo_from_sigval (sigval);
if (DBG_X509)
{
log_debug ("signer %d - signature available (sigval hash=%d)",
signer, sigval_hash_algo);
/* log_printhex ("sigval ", sigval, */
/* gcry_sexp_canon_len (sigval, 0, NULL, NULL)); */
}
if (!sigval_hash_algo)
sigval_hash_algo = algo; /* Fallback used e.g. with old libksba. */
/* Find the certificate of the signer */
keydb_search_reset (kh);
rc = keydb_search_issuer_sn (kh, issuer, serial);
if (rc)
{
if (rc == -1)
{
log_error ("certificate not found\n");
rc = gpg_error (GPG_ERR_NO_PUBKEY);
}
else
log_error ("failed to find the certificate: %s\n",
gpg_strerror(rc));
{
char numbuf[50];
sprintf (numbuf, "%d", rc);
gpgsm_status2 (ctrl, STATUS_ERROR, "verify.findkey",
numbuf, NULL);
}
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "no-cert");
goto next_signer;
}
rc = keydb_get_cert (kh, &cert);
if (rc)
{
log_error ("failed to get cert: %s\n", gpg_strerror (rc));
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
goto next_signer;
}
log_info (_("Signature made "));
if (*sigtime)
dump_isotime (sigtime);
else
log_printf (_("[date not given]"));
log_printf (_(" using certificate ID 0x%08lX\n"),
gpgsm_get_short_fingerprint (cert, NULL));
audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
if (msgdigest)
{ /* Signed attributes are available. */
gcry_md_hd_t md;
unsigned char *s;
/* Check that the message digest in the signed attributes
matches the one we calculated on the data. */
s = gcry_md_read (data_md, algo);
if ( !s || !msgdigestlen
|| gcry_md_get_algo_dlen (algo) != msgdigestlen
|| !s || memcmp (s, msgdigest, msgdigestlen) )
{
char *fpr;
log_error (_("invalid signature: message digest attribute "
"does not match computed one\n"));
if (DBG_X509)
{
if (msgdigest)
log_printhex ("message: ", msgdigest, msgdigestlen);
if (s)
log_printhex ("computed: ",
s, gcry_md_get_algo_dlen (algo));
}
fpr = gpgsm_fpr_and_name_for_status (cert);
gpgsm_status (ctrl, STATUS_BADSIG, fpr);
xfree (fpr);
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
goto next_signer;
}
audit_log_i (ctrl->audit, AUDIT_ATTR_HASH_ALGO, sigval_hash_algo);
rc = gcry_md_open (&md, sigval_hash_algo, 0);
if (rc)
{
log_error ("md_open failed: %s\n", gpg_strerror (rc));
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
goto next_signer;
}
if (DBG_HASHING)
gcry_md_start_debug (md, "vrfy.attr");
ksba_cms_set_hash_function (cms, HASH_FNC, md);
rc = ksba_cms_hash_signed_attrs (cms, signer);
if (rc)
{
log_error ("hashing signed attrs failed: %s\n",
gpg_strerror (rc));
gcry_md_close (md);
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
goto next_signer;
}
rc = gpgsm_check_cms_signature (cert, sigval, md,
sigval_hash_algo, &info_pkalgo);
gcry_md_close (md);
}
else
{
rc = gpgsm_check_cms_signature (cert, sigval, data_md,
algo, &info_pkalgo);
}
if (rc)
{
char *fpr;
log_error ("invalid signature: %s\n", gpg_strerror (rc));
fpr = gpgsm_fpr_and_name_for_status (cert);
gpgsm_status (ctrl, STATUS_BADSIG, fpr);
xfree (fpr);
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
goto next_signer;
}
rc = gpgsm_cert_use_verify_p (cert); /*(this displays an info message)*/
if (rc)
{
gpgsm_status_with_err_code (ctrl, STATUS_ERROR, "verify.keyusage",
gpg_err_code (rc));
rc = 0;
}
if (DBG_X509)
log_debug ("signature okay - checking certs\n");
audit_log (ctrl->audit, AUDIT_VALIDATE_CHAIN);
rc = gpgsm_validate_chain (ctrl, cert,
*sigtime? sigtime : "19700101T000000",
keyexptime, 0,
NULL, 0, &verifyflags);
{
char *fpr, *buf, *tstr;
fpr = gpgsm_fpr_and_name_for_status (cert);
if (gpg_err_code (rc) == GPG_ERR_CERT_EXPIRED)
{
gpgsm_status (ctrl, STATUS_EXPKEYSIG, fpr);
rc = 0;
}
else
gpgsm_status (ctrl, STATUS_GOODSIG, fpr);
xfree (fpr);
fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
tstr = strtimestamp_r (sigtime);
buf = xasprintf ("%s %s %s %s 0 0 %d %d 00", fpr, tstr,
*sigtime? sigtime : "0",
*keyexptime? keyexptime : "0",
info_pkalgo, algo);
xfree (tstr);
xfree (fpr);
gpgsm_status (ctrl, STATUS_VALIDSIG, buf);
xfree (buf);
}
audit_log_ok (ctrl->audit, AUDIT_CHAIN_STATUS, rc);
if (rc) /* of validate_chain */
{
log_error ("invalid certification chain: %s\n", gpg_strerror (rc));
if (gpg_err_code (rc) == GPG_ERR_BAD_CERT_CHAIN
|| gpg_err_code (rc) == GPG_ERR_BAD_CERT
|| gpg_err_code (rc) == GPG_ERR_BAD_CA_CERT
|| gpg_err_code (rc) == GPG_ERR_CERT_REVOKED)
gpgsm_status_with_err_code (ctrl, STATUS_TRUST_NEVER, NULL,
gpg_err_code (rc));
else
gpgsm_status_with_err_code (ctrl, STATUS_TRUST_UNDEFINED, NULL,
gpg_err_code (rc));
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
goto next_signer;
}
audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "good");
for (i=0; (p = ksba_cert_get_subject (cert, i)); i++)
{
log_info (!i? _("Good signature from")
: _(" aka"));
log_printf (" \"");
gpgsm_print_name (log_get_stream (), p);
log_printf ("\"\n");
ksba_free (p);
}
/* Print a note if this is a qualified signature. */
{
size_t qualbuflen;
char qualbuffer[1];
rc = ksba_cert_get_user_data (cert, "is_qualified", &qualbuffer,
sizeof (qualbuffer), &qualbuflen);
if (!rc && qualbuflen)
{
if (*qualbuffer)
{
log_info (_("This is a qualified signature\n"));
if (!opt.qualsig_approval)
log_info
(_("Note, that this software is not officially approved "
"to create or verify such signatures.\n"));
}
}
else if (gpg_err_code (rc) != GPG_ERR_NOT_FOUND)
log_error ("get_user_data(is_qualified) failed: %s\n",
gpg_strerror (rc));
}
gpgsm_status (ctrl, STATUS_TRUST_FULLY,
(verifyflags & VALIDATE_FLAG_CHAIN_MODEL)?
"0 chain": "0 shell");
next_signer:
rc = 0;
xfree (issuer);
xfree (serial);
xfree (sigval);
xfree (msgdigest);
ksba_cert_release (cert);
cert = NULL;
}
rc = 0;
leave:
ksba_cms_release (cms);
gpgsm_destroy_reader (b64reader);
gpgsm_destroy_writer (b64writer);
keydb_release (kh);
gcry_md_close (data_md);
if (fp)
fclose (fp);
if (rc)
{
char numbuf[50];
sprintf (numbuf, "%d", rc );
gpgsm_status2 (ctrl, STATUS_ERROR, "verify.leave",
numbuf, NULL);
}
return rc;
}
