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myproxy_ocsp.c
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myproxy_ocsp.c
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/*
* Copyright 2003, John Viega and Matt Messier
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the names of the authors nor the names of the
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Modified from the Secure Programming Cookbook for C and C++ by John
* Viega and Matt Messier (http://www.secureprogramming.com/).
*/
#include "myproxy_common.h"
#include "myproxy_ocsp.h"
#include "myproxy_ocsp_aia.h"
#if defined(HAVE_OCSP)
#include <openssl/bio.h>
#include <openssl/conf.h>
#include <openssl/ocsp.h>
#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#endif
typedef enum {
MYPROXY_OCSPRESULT_ERROR_NOTCONFIGURED = -14,
MYPROXY_OCSPRESULT_ERROR_NOAIAOCSPURI = -13,
MYPROXY_OCSPRESULT_ERROR_INVALIDRESPONSE = -12,
MYPROXY_OCSPRESULT_ERROR_CONNECTFAILURE = -11,
MYPROXY_OCSPRESULT_ERROR_SIGNFAILURE = -10,
MYPROXY_OCSPRESULT_ERROR_BADOCSPADDRESS = -9,
MYPROXY_OCSPRESULT_ERROR_OUTOFMEMORY = -8,
MYPROXY_OCSPRESULT_ERROR_UNKNOWN = -7,
MYPROXY_OCSPRESULT_ERROR_UNAUTHORIZED = -6,
MYPROXY_OCSPRESULT_ERROR_SIGREQUIRED = -5,
MYPROXY_OCSPRESULT_ERROR_TRYLATER = -3,
MYPROXY_OCSPRESULT_ERROR_INTERNALERROR = -2,
MYPROXY_OCSPRESULT_ERROR_MALFORMEDREQUEST = -1,
MYPROXY_OCSPRESULT_CERTIFICATE_VALID = 0,
MYPROXY_OCSPRESULT_CERTIFICATE_REVOKED = 1
} myproxy_ocspresult_t;
static char *responder_url = NULL;
static STACK_OF(X509) *responder_cert = NULL;
static char *policy = NULL;
static X509 *sign_cert = NULL;
static EVP_PKEY *sign_key = NULL;
static long skew = MYPROXY_DEFAULT_CLOCK_SKEW;
static long maxage = -1;
static int usenonce = 0;
int
myproxy_ocsp_set_responder(const char *newurl) {
if (responder_url) free(responder_url);
responder_url = strdup(newurl);
return 0;
}
int
myproxy_ocsp_set_responder_cert(const char *path) {
BIO * in = NULL;
X509 * x = NULL;
int count;
int rval = -1;
sk_X509_pop_free(responder_cert, X509_free);
responder_cert = NULL;
in = BIO_new(BIO_s_file_internal());
if (in == NULL || BIO_read_filename(in, path) <= 0) {
verror_put_string("error reading %s", path);
goto exit;
}
responder_cert = sk_X509_new_null();
if (!responder_cert) {
verror_put_string("sk_X509_new_null() failed in "
"myproxy_ocsp_set_responder_cert()");
goto exit;
}
for (count = 0; ; count++) {
x = PEM_read_bio_X509(in, NULL, NULL, NULL);
if (x == NULL) {
if ((ERR_GET_REASON(ERR_peek_error()) ==
PEM_R_NO_START_LINE) && (count > 0)) {
ERR_clear_error();
break;
} else {
verror_put_string("error reading %s", path);
goto exit;
}
}
sk_X509_insert(responder_cert,x,sk_X509_num(responder_cert));
x = NULL;
}
rval = 0; /* success */
exit:
if (in) BIO_free_all(in);
if (x) X509_free(x);
return rval;
}
int
myproxy_ocsp_set_policy(const char *newpolicy) {
if (policy) free(policy);
policy = strdup(newpolicy);
return 0;
}
int
myproxy_ocsp_set_signer(X509 *new_sign_cert, EVP_PKEY *new_sign_key) {
sign_cert = new_sign_cert;
sign_key = new_sign_key;
return 0;
}
int
myproxy_ocsp_set_times(long newskew, long newmaxage) {
skew = newskew;
maxage = newmaxage;
return 0;
}
int
myproxy_ocsp_use_nonce(int newusenonce) {
usenonce = newusenonce;
return 0;
}
#if !defined(HAVE_OCSP)
int myproxy_ocsp_verify(X509 *cert, X509 *issuer) {
return MYPROXY_OCSPRESULT_ERROR_NOTCONFIGURED;
}
#else
static int
verify_cert_hostname(X509 *cert, char *hostname) {
int extcount, i, j, ok = 0;
char name[256];
X509_NAME *subj;
const char *extstr;
CONF_VALUE *nval;
const unsigned char *data;
X509_EXTENSION *ext;
X509V3_EXT_METHOD *meth;
STACK_OF(CONF_VALUE) *val;
if ((extcount = X509_get_ext_count(cert)) > 0) {
for (i = 0; !ok && i < extcount; i++) {
ext = X509_get_ext(cert, i);
extstr = OBJ_nid2sn(OBJ_obj2nid(X509_EXTENSION_get_object(ext)));
if (!strcasecmp(extstr, "subjectAltName")) {
if (!(meth = (X509V3_EXT_METHOD *)X509V3_EXT_get(ext))) break;
data = ext->value->data;
val = meth->i2v(meth, meth->d2i(0, &data, ext->value->length), 0);
for (j = 0; j < sk_CONF_VALUE_num(val); j++) {
nval = sk_CONF_VALUE_value(val, j);
if (!strcasecmp(nval->name, "DNS") && !strcasecmp(nval->value, hostname)) {
ok = 1;
break;
}
}
}
}
}
if (!ok && (subj = X509_get_subject_name(cert)) &&
X509_NAME_get_text_by_NID(subj, NID_commonName, name, sizeof(name)) > 0) {
name[sizeof(name) - 1] = '\0';
if (!strcasecmp(name, hostname)) ok = 1;
}
return ok;
}
static BIO *
my_connect_ssl(char *host, int port, SSL_CTX **ctx) {
BIO *conn = 0;
if (!(conn = BIO_new_ssl_connect(*ctx))) goto error_exit;
BIO_set_conn_hostname(conn, host);
BIO_set_conn_int_port(conn, &port);
if (BIO_do_connect(conn) <= 0) goto error_exit;
return conn;
error_exit:
if (conn) BIO_free_all(conn);
return 0;
}
static BIO *
my_connect(char *host, int port, int ssl, SSL_CTX **ctx) {
BIO *conn;
SSL *ssl_ptr;
if (ssl) {
if (!(conn = my_connect_ssl(host, port, ctx))) goto error_exit;
BIO_get_ssl(conn, &ssl_ptr);
if (!verify_cert_hostname(SSL_get_peer_certificate(ssl_ptr), host))
goto error_exit;
if (SSL_get_verify_result(ssl_ptr) != X509_V_OK) goto error_exit;
return conn;
}
if (!(conn = BIO_new_connect(host))) goto error_exit;
BIO_set_conn_int_port(conn, &port);
if (BIO_do_connect(conn) <= 0) goto error_exit;
return conn;
error_exit:
if (conn) BIO_free_all(conn);
return 0;
}
int myproxy_ocsp_verify(X509 *cert, X509 *issuer) {
BIO *bio = 0;
int rc, reason, ssl, status;
char *host = 0, *path = 0, *port = 0, *certdir = 0;
char *aiaocspurl = 0, *chosenurl = 0;
SSL_CTX *ctx = 0;
X509_LOOKUP *lookup = NULL;
X509_STORE *store = 0;
OCSP_CERTID *id;
OCSP_REQUEST *req = 0;
OCSP_RESPONSE *resp = 0;
OCSP_BASICRESP *basic = 0;
myproxy_ocspresult_t result;
ASN1_GENERALIZEDTIME *producedAt, *thisUpdate, *nextUpdate;
globus_result_t res;
if (!policy && !responder_url) {
result = MYPROXY_OCSPRESULT_ERROR_NOTCONFIGURED;
goto end;
}
result = MYPROXY_OCSPRESULT_ERROR_UNKNOWN;
if (policy && strstr(policy, "aia")) {
aiaocspurl = myproxy_get_aia_ocsp_uri(cert);
}
if (!responder_url && !aiaocspurl) {
result = MYPROXY_OCSPRESULT_ERROR_NOTCONFIGURED;
goto end;
}
chosenurl = aiaocspurl ? aiaocspurl : responder_url;
if (!OCSP_parse_url(chosenurl, &host, &port, &path, &ssl)) {
result = MYPROXY_OCSPRESULT_ERROR_BADOCSPADDRESS;
goto end;
}
myproxy_log("querying OCSP responder at %s", chosenurl);
if (!(req = OCSP_REQUEST_new())) {
result = MYPROXY_OCSPRESULT_ERROR_OUTOFMEMORY;
goto end;
}
id = OCSP_cert_to_id(0, cert, issuer);
if (!id || !OCSP_request_add0_id(req, id)) goto end;
if (usenonce) OCSP_request_add1_nonce(req, 0, -1);
/* sign the request */
if (sign_cert && sign_key &&
!OCSP_request_sign(req, sign_cert, sign_key, EVP_sha1(), 0, 0)) {
result = MYPROXY_OCSPRESULT_ERROR_SIGNFAILURE;
goto end;
}
/* setup GSI context */
store=X509_STORE_new();
lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir());
if (lookup == NULL) {
result = MYPROXY_OCSPRESULT_ERROR_OUTOFMEMORY;
goto end;
}
res = GLOBUS_GSI_SYSCONFIG_GET_CERT_DIR(&certdir);
if (res != GLOBUS_SUCCESS) {
verror_put_string("failed to find GSI CA cert directory");
globus_error_to_verror(res);
goto end;
}
X509_LOOKUP_add_dir(lookup, certdir, X509_FILETYPE_PEM);
ctx = SSL_CTX_new(SSLv23_client_method());
if (ctx == NULL) {
result = MYPROXY_OCSPRESULT_ERROR_OUTOFMEMORY;
goto end;
}
SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2);
SSL_CTX_set_cert_store(ctx, store);
SSL_CTX_set_verify(ctx,SSL_VERIFY_PEER,NULL);
/* establish a connection to the OCSP responder */
if (!(bio = my_connect(host, atoi(port), ssl, &ctx))) {
result = MYPROXY_OCSPRESULT_ERROR_CONNECTFAILURE;
goto end;
}
/* send the request and get a response */
resp = OCSP_sendreq_bio(bio, path, req);
if ((rc = OCSP_response_status(resp)) != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
switch (rc) {
case OCSP_RESPONSE_STATUS_MALFORMEDREQUEST:
result = MYPROXY_OCSPRESULT_ERROR_MALFORMEDREQUEST; break;
case OCSP_RESPONSE_STATUS_INTERNALERROR:
result = MYPROXY_OCSPRESULT_ERROR_INTERNALERROR; break;
case OCSP_RESPONSE_STATUS_TRYLATER:
result = MYPROXY_OCSPRESULT_ERROR_TRYLATER; break;
case OCSP_RESPONSE_STATUS_SIGREQUIRED:
result = MYPROXY_OCSPRESULT_ERROR_SIGREQUIRED; break;
case OCSP_RESPONSE_STATUS_UNAUTHORIZED:
result = MYPROXY_OCSPRESULT_ERROR_UNAUTHORIZED; break;
}
goto end;
}
/* verify the response */
result = MYPROXY_OCSPRESULT_ERROR_INVALIDRESPONSE;
if (!(basic = OCSP_response_get1_basic(resp))) goto end;
if (usenonce && OCSP_check_nonce(req, basic) <= 0) goto end;
if (!responder_cert ||
(rc = OCSP_basic_verify(basic, responder_cert, store,
OCSP_TRUSTOTHER)) <= 0)
if ((rc = OCSP_basic_verify(basic, NULL, store, 0)) <= 0)
goto end;
if (!OCSP_resp_find_status(basic, id, &status, &reason, &producedAt,
&thisUpdate, &nextUpdate))
goto end;
if (!OCSP_check_validity(thisUpdate, nextUpdate, skew, maxage))
goto end;
/* All done. Set the return code based on the status from the response. */
if (status == V_OCSP_CERTSTATUS_REVOKED) {
result = MYPROXY_OCSPRESULT_CERTIFICATE_REVOKED;
myproxy_log("OCSP status revoked!");
} else {
result = MYPROXY_OCSPRESULT_CERTIFICATE_VALID;
myproxy_log("OCSP status valid");
}
end:
if (result < 0 && result != MYPROXY_OCSPRESULT_ERROR_NOTCONFIGURED) {
ssl_error_to_verror();
myproxy_log("OCSP check failed");
myproxy_log_verror();
}
if (bio) BIO_free_all(bio);
if (host) OPENSSL_free(host);
if (port) OPENSSL_free(port);
if (path) OPENSSL_free(path);
if (req) OCSP_REQUEST_free(req);
if (resp) OCSP_RESPONSE_free(resp);
if (basic) OCSP_BASICRESP_free(basic);
if (ctx) SSL_CTX_free(ctx); /* this does X509_STORE_free(store) */
if (certdir) free(certdir);
if (aiaocspurl) free(aiaocspurl);
return result;
}
#endif