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stunnel4/src/verify.c

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/*
* stunnel TLS offloading and load-balancing proxy
* Copyright (C) 1998-2017 Michal Trojnara <Michal.Trojnara@stunnel.org>
*
* 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, see <http://www.gnu.org/licenses>.
*
* Linking stunnel statically or dynamically with other modules is making
* a combined work based on stunnel. Thus, the terms and conditions of
* the GNU General Public License cover the whole combination.
*
* In addition, as a special exception, the copyright holder of stunnel
* gives you permission to combine stunnel with free software programs or
* libraries that are released under the GNU LGPL and with code included
* in the standard release of OpenSSL under the OpenSSL License (or
* modified versions of such code, with unchanged license). You may copy
* and distribute such a system following the terms of the GNU GPL for
* stunnel and the licenses of the other code concerned.
*
* Note that people who make modified versions of stunnel are not obligated
* to grant this special exception for their modified versions; it is their
* choice whether to do so. The GNU General Public License gives permission
* to release a modified version without this exception; this exception
* also makes it possible to release a modified version which carries
* forward this exception.
*/
#include "common.h"
#include "prototypes.h"
/**************************************** prototypes */
/* verify initialization */
NOEXPORT void set_client_CA_list(SERVICE_OPTIONS *section);
NOEXPORT void auth_warnings(SERVICE_OPTIONS *);
NOEXPORT int crl_init(SERVICE_OPTIONS *section);
NOEXPORT int load_file_lookup(X509_STORE *, char *);
NOEXPORT int add_dir_lookup(X509_STORE *, char *);
/* verify callback */
NOEXPORT int verify_callback(int, X509_STORE_CTX *);
NOEXPORT int verify_checks(CLI *, int, X509_STORE_CTX *);
NOEXPORT int cert_check(CLI *, X509_STORE_CTX *, int);
#if OPENSSL_VERSION_NUMBER>=0x10002000L
NOEXPORT int cert_check_subject(CLI *, X509_STORE_CTX *);
#endif /* OPENSSL_VERSION_NUMBER>=0x10002000L */
NOEXPORT int cert_check_local(X509_STORE_CTX *);
NOEXPORT int compare_pubkeys(X509 *, X509 *);
#ifndef OPENSSL_NO_OCSP
NOEXPORT int ocsp_check(CLI *, X509_STORE_CTX *);
NOEXPORT int ocsp_request(CLI *, X509_STORE_CTX *, OCSP_CERTID *, char *);
NOEXPORT OCSP_RESPONSE *ocsp_get_response(CLI *, OCSP_REQUEST *, char *);
#endif
/* utility functions */
#ifndef OPENSSL_NO_OCSP
NOEXPORT X509 *get_current_issuer(X509_STORE_CTX *);
NOEXPORT void log_time(const int, const char *, ASN1_TIME *);
#endif
/**************************************** verify initialization */
int verify_init(SERVICE_OPTIONS *section) {
int verify_mode=0;
/* CA initialization */
if(section->ca_file || section->ca_dir) {
if(!SSL_CTX_load_verify_locations(section->ctx,
section->ca_file, section->ca_dir)) {
sslerror("SSL_CTX_load_verify_locations");
return 1; /* FAILED */
}
}
if(section->ca_file && !section->option.client)
set_client_CA_list(section); /* only performed on the server */
/* CRL initialization */
if(section->crl_file || section->crl_dir)
if(crl_init(section))
return 1; /* FAILED */
/* verify callback setup */
if(section->option.request_cert) {
verify_mode|=SSL_VERIFY_PEER;
if(section->option.require_cert && !section->redirect_addr.names)
verify_mode|=SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
}
SSL_CTX_set_verify(section->ctx, verify_mode, verify_callback);
auth_warnings(section);
return 0; /* OK */
}
/* trusted CA names sent to clients for client cert selection */
NOEXPORT void set_client_CA_list(SERVICE_OPTIONS *section) {
STACK_OF(X509_NAME) *ca_dn;
s_log(LOG_DEBUG, "Client CA list: %s", section->ca_file);
ca_dn=SSL_load_client_CA_file(section->ca_file);
SSL_CTX_set_client_CA_list(section->ctx, ca_dn);
print_client_CA_list(ca_dn);
}
NOEXPORT int crl_init(SERVICE_OPTIONS *section) {
X509_STORE *store;
store=SSL_CTX_get_cert_store(section->ctx);
if(section->crl_file) {
if(load_file_lookup(store, section->crl_file))
return 1; /* FAILED */
}
if(section->crl_dir) {
#if OPENSSL_VERSION_NUMBER<0x10100000L
/* do not cache CRLs (only required with OpenSSL version < 1.0.0) */
store->cache=0;
#endif
if(add_dir_lookup(store, section->crl_dir))
return 1; /* FAILED */
}
X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
return 0; /* OK */
}
NOEXPORT int load_file_lookup(X509_STORE *store, char *name) {
X509_LOOKUP *lookup;
lookup=X509_STORE_add_lookup(store, X509_LOOKUP_file());
if(!lookup) {
sslerror("X509_STORE_add_lookup(X509_LOOKUP_file)");
return 1; /* FAILED */
}
if(!X509_load_crl_file(lookup, name, X509_FILETYPE_PEM)) {
s_log(LOG_ERR, "Failed to load %s revocation lookup file", name);
sslerror("X509_load_crl_file");
return 1; /* FAILED */
}
s_log(LOG_DEBUG, "Loaded %s revocation lookup file", name);
return 0; /* OK */
}
NOEXPORT int add_dir_lookup(X509_STORE *store, char *name) {
X509_LOOKUP *lookup;
lookup=X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir());
if(!lookup) {
sslerror("X509_STORE_add_lookup(X509_LOOKUP_hash_dir)");
return 1; /* FAILED */
}
if(!X509_LOOKUP_add_dir(lookup, name, X509_FILETYPE_PEM)) {
s_log(LOG_ERR, "Failed to add %s revocation lookup directory", name);
sslerror("X509_LOOKUP_add_dir");
return 1; /* FAILED */
}
s_log(LOG_DEBUG, "Added %s revocation lookup directory", name);
return 0; /* OK */
}
/* issue warnings on insecure/missing authentication */
NOEXPORT void auth_warnings(SERVICE_OPTIONS *section) {
#ifndef OPENSSL_NO_PSK
if(section->psk_keys)
return;
#endif /* !defined(OPENSSL_NO_PSK) */
/* for servers it is usually okay to accept all client
certificates signed by a specified certificate authority */
if(!section->option.client)
return;
if(section->option.verify_peer) /* verify_peer does not depend on PKI */
return;
if(section->option.verify_chain) {
#if OPENSSL_VERSION_NUMBER>=0x10002000L
if(section->check_email || section->check_host || section->check_ip)
return;
#endif /* OPENSSL_VERSION_NUMBER>=0x10002000L */
s_log(LOG_WARNING,
"Service [%s] uses \"verifyChain\" without subject checks",
section->servname);
#if OPENSSL_VERSION_NUMBER<0x10002000L
s_log(LOG_WARNING,
"Rebuild your stunnel against OpenSSL version 1.0.2 or higher");
#endif /* OPENSSL_VERSION_NUMBER<0x10002000L */
s_log(LOG_WARNING,
"Use \"checkHost\" or \"checkIP\" to restrict trusted certificates");
return;
}
s_log(LOG_WARNING,
"Service [%s] needs authentication to prevent MITM attacks",
section->servname);
}
/**************************************** verify callback */
NOEXPORT int verify_callback(int preverify_ok, X509_STORE_CTX *callback_ctx) {
/* our verify callback function */
SSL *ssl;
CLI *c;
/* retrieve application specific data */
ssl=X509_STORE_CTX_get_ex_data(callback_ctx,
SSL_get_ex_data_X509_STORE_CTX_idx());
c=SSL_get_ex_data(ssl, index_ssl_cli);
if(!c->opt->option.verify_chain && !c->opt->option.verify_peer) {
s_log(LOG_INFO, "Certificate verification disabled");
return 1; /* accept */
}
if(verify_checks(c, preverify_ok, callback_ctx)) {
if(!SSL_SESSION_set_ex_data(SSL_get_session(ssl),
index_session_authenticated, (void *)(-1))) {
sslerror("SSL_SESSION_set_ex_data");
return 0; /* reject */
}
return 1; /* accept */
}
if(c->opt->option.client || c->opt->protocol)
return 0; /* reject */
if(c->opt->redirect_addr.names)
return 1; /* accept */
return 0; /* reject */
}
NOEXPORT int verify_checks(CLI *c,
int preverify_ok, X509_STORE_CTX *callback_ctx) {
X509 *cert;
int depth;
char *subject;
cert=X509_STORE_CTX_get_current_cert(callback_ctx);
depth=X509_STORE_CTX_get_error_depth(callback_ctx);
subject=X509_NAME2text(X509_get_subject_name(cert));
s_log(LOG_DEBUG, "Verification started at depth=%d: %s", depth, subject);
if(!cert_check(c, callback_ctx, preverify_ok)) {
s_log(LOG_WARNING, "Rejected by CERT at depth=%d: %s", depth, subject);
str_free(subject);
return 0; /* reject */
}
#ifndef OPENSSL_NO_OCSP
if((c->opt->ocsp_url || c->opt->option.aia) &&
!ocsp_check(c, callback_ctx)) {
s_log(LOG_WARNING, "Rejected by OCSP at depth=%d: %s", depth, subject);
str_free(subject);
return 0; /* reject */
}
#endif /* !defined(OPENSSL_NO_OCSP) */
s_log(depth ? LOG_INFO : LOG_NOTICE,
"Certificate accepted at depth=%d: %s", depth, subject);
str_free(subject);
return 1; /* accept */
}
/**************************************** certificate checking */
NOEXPORT int cert_check(CLI *c, X509_STORE_CTX *callback_ctx,
int preverify_ok) {
int err=X509_STORE_CTX_get_error(callback_ctx);
int depth=X509_STORE_CTX_get_error_depth(callback_ctx);
if(preverify_ok) {
s_log(LOG_DEBUG, "CERT: Pre-verification succeeded");
} else { /* remote site sent an invalid certificate */
if(c->opt->option.verify_chain || (depth==0 &&
err!=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY &&
err!=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE &&
err!=X509_V_ERR_CERT_UNTRUSTED)) {
s_log(LOG_WARNING, "CERT: Pre-verification error: %s",
X509_verify_cert_error_string(err));
/* retain the STORE_CTX error produced by pre-verification */
return 0; /* reject */
}
s_log(LOG_INFO, "CERT: Pre-verification error ignored: %s",
X509_verify_cert_error_string(err));
}
if(depth==0) { /* additional peer certificate checks */
#if OPENSSL_VERSION_NUMBER>=0x10002000L
if(!cert_check_subject(c, callback_ctx))
return 0; /* reject */
#endif /* OPENSSL_VERSION_NUMBER>=0x10002000L */
if(c->opt->option.verify_peer && !cert_check_local(callback_ctx))
return 0; /* reject */
}
return 1; /* accept */
}
#if OPENSSL_VERSION_NUMBER>=0x10002000L
NOEXPORT int cert_check_subject(CLI *c, X509_STORE_CTX *callback_ctx) {
X509 *cert=X509_STORE_CTX_get_current_cert(callback_ctx);
NAME_LIST *ptr;
char *peername=NULL;
if(c->opt->check_host) {
for(ptr=c->opt->check_host; ptr; ptr=ptr->next)
if(X509_check_host(cert, ptr->name, 0, 0, &peername)>0)
break;
if(!ptr) {
s_log(LOG_WARNING, "CERT: No matching host name found");
return 0; /* reject */
}
s_log(LOG_INFO, "CERT: Host name \"%s\" matched with \"%s\"",
ptr->name, peername);
OPENSSL_free(peername);
}
if(c->opt->check_email) {
for(ptr=c->opt->check_email; ptr; ptr=ptr->next)
if(X509_check_email(cert, ptr->name, 0, 0)>0)
break;
if(!ptr) {
s_log(LOG_WARNING, "CERT: No matching email address found");
return 0; /* reject */
}
s_log(LOG_INFO, "CERT: Email address \"%s\" matched", ptr->name);
}
if(c->opt->check_ip) {
for(ptr=c->opt->check_ip; ptr; ptr=ptr->next)
if(X509_check_ip_asc(cert, ptr->name, 0)>0)
break;
if(!ptr) {
s_log(LOG_WARNING, "CERT: No matching IP address found");
return 0; /* reject */
}
s_log(LOG_INFO, "CERT: IP address \"%s\" matched", ptr->name);
}
return 1; /* accept */
}
#endif /* OPENSSL_VERSION_NUMBER>=0x10002000L */
#if OPENSSL_VERSION_NUMBER>=0x10000000L
/* modern implementation for OpenSSL version >= 1.0.0 */
NOEXPORT int cert_check_local(X509_STORE_CTX *callback_ctx) {
X509 *cert;
X509_NAME *subject;
STACK_OF(X509) *sk;
int i;
cert=X509_STORE_CTX_get_current_cert(callback_ctx);
subject=X509_get_subject_name(cert);
#if OPENSSL_VERSION_NUMBER<0x10100006L
#define X509_STORE_CTX_get1_certs X509_STORE_get1_certs
#endif
/* modern API allows retrieving multiple matching certificates */
sk=X509_STORE_CTX_get1_certs(callback_ctx, subject);
if(sk) {
for(i=0; i<sk_X509_num(sk); i++)
if(compare_pubkeys(cert, sk_X509_value(sk, i))) {
sk_X509_pop_free(sk, X509_free);
return 1; /* accept */
}
sk_X509_pop_free(sk, X509_free);
}
s_log(LOG_WARNING, "CERT: Certificate not found in local repository");
X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CERT_REJECTED);
return 0; /* reject */
}
#else /* OPENSSL_VERSION_NUMBER<0x10000000L */
/* legacy implementation for OpenSSL version < 1.0.0 */
NOEXPORT int cert_check_local(X509_STORE_CTX *callback_ctx) {
X509 *cert;
X509_NAME *subject;
X509_OBJECT obj;
int success;
cert=X509_STORE_CTX_get_current_cert(callback_ctx);
subject=X509_get_subject_name(cert);
/* pre-1.0.0 API only returns a single matching certificate */
memset((char *)&obj, 0, sizeof obj);
if(X509_STORE_get_by_subject(callback_ctx, X509_LU_X509,
subject, &obj)<=0) {
s_log(LOG_WARNING, "CERT: Certificate not found in local repository");
X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CERT_REJECTED);
return 0; /* reject */
}
success=compare_pubkeys(cert, obj.data.x509);
X509_OBJECT_free_contents(&obj);
if(success)
return 1; /* accept */
s_log(LOG_WARNING, "CERT: Public keys do not match");
X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CERT_REJECTED);
return 0; /* reject */
}
#endif /* OPENSSL_VERSION_NUMBER>=0x10000000L */
NOEXPORT int compare_pubkeys(X509 *c1, X509 *c2) {
ASN1_BIT_STRING *k1=X509_get0_pubkey_bitstr(c1);
ASN1_BIT_STRING *k2=X509_get0_pubkey_bitstr(c2);
if(!k1 || !k2 || k1->length!=k2->length || k1->length<0 ||
safe_memcmp(k1->data, k2->data, (size_t)k1->length))
return 0; /* reject */
s_log(LOG_INFO, "CERT: Locally installed certificate matched");
return 1; /* accept */
}
/**************************************** OCSP checking */
#ifndef OPENSSL_NO_OCSP
#ifdef DEFINE_STACK_OF
/* defined in openssl/safestack.h:
* DEFINE_SPECIAL_STACK_OF(OPENSSL_STRING, char) */
#else /* DEFINE_STACK_OF */
#ifndef sk_OPENSSL_STRING_num
#define sk_OPENSSL_STRING_num(st) sk_num(st)
#endif /* sk_OPENSSL_STRING_num */
#ifndef sk_OPENSSL_STRING_value
#define sk_OPENSSL_STRING_value(st, i) sk_value((st),(i))
#endif /* sk_OPENSSL_STRING_value */
#endif /* DEFINE_STACK_OF */
NOEXPORT int ocsp_check(CLI *c, X509_STORE_CTX *callback_ctx) {
X509 *cert;
OCSP_CERTID *cert_id;
STACK_OF(OPENSSL_STRING) *aia;
int i, ocsp_status=V_OCSP_CERTSTATUS_UNKNOWN, saved_error;
char *url;
/* the original error code is restored unless we report our own error */
saved_error=X509_STORE_CTX_get_error(callback_ctx);
/* get the current certificate ID */
cert=X509_STORE_CTX_get_current_cert(callback_ctx);
if(!cert) {
s_log(LOG_ERR, "OCSP: Failed to get the current certificate");
X509_STORE_CTX_set_error(callback_ctx,
X509_V_ERR_APPLICATION_VERIFICATION);
return 0; /* reject */
}
if(!X509_NAME_cmp(X509_get_subject_name(cert),
X509_get_issuer_name(cert))) {
s_log(LOG_DEBUG, "OCSP: Ignoring root certificate");
return 1; /* accept */
}
cert_id=OCSP_cert_to_id(NULL, cert, get_current_issuer(callback_ctx));
if(!cert_id) {
sslerror("OCSP: OCSP_cert_to_id");
X509_STORE_CTX_set_error(callback_ctx,
X509_V_ERR_APPLICATION_VERIFICATION);
return 0; /* reject */
}
/* use the responder specified in the configuration file */
if(c->opt->ocsp_url) {
s_log(LOG_NOTICE, "OCSP: Connecting the configured responder \"%s\"",
c->opt->ocsp_url);
if(ocsp_request(c, callback_ctx, cert_id, c->opt->ocsp_url)!=
V_OCSP_CERTSTATUS_GOOD) {
OCSP_CERTID_free(cert_id);
return 0; /* reject */
}
}
/* use the responder from AIA (Authority Information Access) */
if(c->opt->option.aia && (aia=X509_get1_ocsp(cert))) {
for(i=0; i<sk_OPENSSL_STRING_num(aia); i++) {
url=sk_OPENSSL_STRING_value(aia, i);
s_log(LOG_NOTICE, "OCSP: Connecting the AIA responder \"%s\"", url);
ocsp_status=ocsp_request(c, callback_ctx, cert_id, url);
if(ocsp_status!=V_OCSP_CERTSTATUS_UNKNOWN)
break; /* we received a definitive response */
}
X509_email_free(aia);
if(ocsp_status!=V_OCSP_CERTSTATUS_GOOD) {
OCSP_CERTID_free(cert_id);
return 0; /* reject */
}
}
OCSP_CERTID_free(cert_id);
X509_STORE_CTX_set_error(callback_ctx, saved_error);
return 1; /* accept */
}
/* returns one of:
* V_OCSP_CERTSTATUS_GOOD
* V_OCSP_CERTSTATUS_REVOKED
* V_OCSP_CERTSTATUS_UNKNOWN */
NOEXPORT int ocsp_request(CLI *c, X509_STORE_CTX *callback_ctx,
OCSP_CERTID *cert_id, char *url) {
int ocsp_status=V_OCSP_CERTSTATUS_UNKNOWN;
int response_status;
int reason;
int ctx_err=X509_V_ERR_APPLICATION_VERIFICATION;
OCSP_REQUEST *request=NULL;
OCSP_RESPONSE *response=NULL;
OCSP_BASICRESP *basic_response=NULL;
ASN1_GENERALIZEDTIME *revoked_at=NULL,
*this_update=NULL, *next_update=NULL;
/* build request */
request=OCSP_REQUEST_new();
if(!request) {
sslerror("OCSP: OCSP_REQUEST_new");
goto cleanup;
}
if(!OCSP_request_add0_id(request, OCSP_CERTID_dup(cert_id))) {
sslerror("OCSP: OCSP_request_add0_id");
goto cleanup;
}
if(c->opt->option.nonce)
OCSP_request_add1_nonce(request, NULL, -1);
/* send the request and get a response */
response=ocsp_get_response(c, request, url);
if(!response)
goto cleanup;
response_status=OCSP_response_status(response);
if(response_status!=OCSP_RESPONSE_STATUS_SUCCESSFUL) {
s_log(LOG_ERR, "OCSP: Responder error: %d: %s",
response_status, OCSP_response_status_str(response_status));
goto cleanup;
}
/* verify the response */
basic_response=OCSP_response_get1_basic(response);
if(!basic_response) {
sslerror("OCSP: OCSP_response_get1_basic");
goto cleanup;
}
if(c->opt->option.nonce && OCSP_check_nonce(request, basic_response)<=0) {
s_log(LOG_ERR, "OCSP: Invalid or unsupported nonce");
goto cleanup;
}
if(OCSP_basic_verify(basic_response,
X509_STORE_CTX_get0_chain(callback_ctx),
SSL_CTX_get_cert_store(c->opt->ctx), c->opt->ocsp_flags)<=0) {
sslerror("OCSP: OCSP_basic_verify");
goto cleanup;
}
if(!OCSP_resp_find_status(basic_response, cert_id, &ocsp_status, &reason,
&revoked_at, &this_update, &next_update)) {
sslerror("OCSP: OCSP_resp_find_status");
goto cleanup;
}
s_log(LOG_INFO, "OCSP: Status: %s", OCSP_cert_status_str(ocsp_status));
log_time(LOG_INFO, "OCSP: This update", this_update);
log_time(LOG_INFO, "OCSP: Next update", next_update);
/* check if the response is valid for at least one minute */
if(!OCSP_check_validity(this_update, next_update, 60, -1)) {
sslerror("OCSP: OCSP_check_validity");
ocsp_status=V_OCSP_CERTSTATUS_UNKNOWN;
goto cleanup;
}
switch(ocsp_status) {
case V_OCSP_CERTSTATUS_GOOD:
s_log(LOG_NOTICE, "OCSP: Certificate accepted");
break;
case V_OCSP_CERTSTATUS_REVOKED:
if(reason==-1)
s_log(LOG_ERR, "OCSP: Certificate revoked");
else
s_log(LOG_ERR, "OCSP: Certificate revoked: %d: %s",
reason, OCSP_crl_reason_str(reason));
log_time(LOG_NOTICE, "OCSP: Revoked at", revoked_at);
ctx_err=X509_V_ERR_CERT_REVOKED;
break;
case V_OCSP_CERTSTATUS_UNKNOWN:
s_log(LOG_WARNING, "OCSP: Unknown verification status");
}
cleanup:
if(request)
OCSP_REQUEST_free(request);
if(response)
OCSP_RESPONSE_free(response);
if(basic_response)
OCSP_BASICRESP_free(basic_response);
if(ocsp_status!=V_OCSP_CERTSTATUS_GOOD)
X509_STORE_CTX_set_error(callback_ctx, ctx_err);
return ocsp_status;
}
NOEXPORT OCSP_RESPONSE *ocsp_get_response(CLI *c,
OCSP_REQUEST *req, char *url) {
BIO *bio=NULL;
OCSP_REQ_CTX *req_ctx=NULL;
OCSP_RESPONSE *resp=NULL;
char *host=NULL, *port=NULL, *path=NULL;
SOCKADDR_UNION addr;
int ssl;
/* parse the OCSP URL */
if(!OCSP_parse_url(url, &host, &port, &path, &ssl)) {
s_log(LOG_ERR, "OCSP: Failed to parse the OCSP URL");
goto cleanup;
}
if(ssl) {
s_log(LOG_ERR, "OCSP: TLS not supported for OCSP"
" - an additional stunnel service needs to be defined");
goto cleanup;
}
if(!hostport2addr(&addr, host, port, 0)) {
s_log(LOG_ERR, "OCSP: Failed to resolve the OCSP responder address");
goto cleanup;
}
/* connect specified OCSP responder */
c->fd=s_socket(addr.sa.sa_family, SOCK_STREAM, 0, 1, "OCSP: socket");
if(c->fd==INVALID_SOCKET)
goto cleanup;
if(s_connect(c, &addr, addr_len(&addr)))
goto cleanup;
bio=BIO_new_socket((int)c->fd, BIO_NOCLOSE);
if(!bio) {
sslerror("OCSP: BIO_new_socket");
goto cleanup;
}
s_log(LOG_DEBUG, "OCSP: Connected %s:%s", host, port);
/* initialize an HTTP request with the POST method */
#if OPENSSL_VERSION_NUMBER>=0x10000000L
req_ctx=OCSP_sendreq_new(bio, path, NULL, -1);
#else
/* there is no way to send the Host header with older OpenSSL versions */
req_ctx=OCSP_sendreq_new(bio, path, req, -1);
#endif
if(!req_ctx) {
sslerror("OCSP: OCSP_sendreq_new");
goto cleanup;
}
#if OPENSSL_VERSION_NUMBER>=0x10000000L
/* add the HTTP headers */
if(!OCSP_REQ_CTX_add1_header(req_ctx, "Host", host)) {
sslerror("OCSP: OCSP_REQ_CTX_add1_header");
goto cleanup;
}
if(!OCSP_REQ_CTX_add1_header(req_ctx, "User-Agent", "stunnel")) {
sslerror("OCSP: OCSP_REQ_CTX_add1_header");
goto cleanup;
}
/* add the remaining HTTP headers and the OCSP request body */
if(!OCSP_REQ_CTX_set1_req(req_ctx, req)) {
sslerror("OCSP: OCSP_REQ_CTX_set1_req");
goto cleanup;
}
#endif
/* OCSP protocol communication loop */
while(OCSP_sendreq_nbio(&resp, req_ctx)==-1) {
s_poll_init(c->fds);
s_poll_add(c->fds, c->fd, BIO_should_read(bio), BIO_should_write(bio));
switch(s_poll_wait(c->fds, c->opt->timeout_busy, 0)) {
case -1:
sockerror("OCSP: s_poll_wait");
goto cleanup;
case 0:
s_log(LOG_INFO, "OCSP: s_poll_wait: TIMEOUTbusy exceeded");
goto cleanup;
}
}
#if 0
s_log(LOG_DEBUG, "OCSP: context state: 0x%x", *(int *)req_ctx);
#endif
/* http://www.mail-archive.com/openssl-users@openssl.org/msg61691.html */
if(resp) {
s_log(LOG_DEBUG, "OCSP: Response received");
} else {
if(ERR_peek_error())
sslerror("OCSP: OCSP_sendreq_nbio");
else /* OpenSSL error: OCSP_sendreq_nbio does not use OCSPerr */
s_log(LOG_ERR, "OCSP: OCSP_sendreq_nbio: OpenSSL internal error");
}
cleanup:
if(req_ctx)
OCSP_REQ_CTX_free(req_ctx);
if(bio)
BIO_free_all(bio);
if(c->fd!=INVALID_SOCKET) {
closesocket(c->fd);
c->fd=INVALID_SOCKET; /* avoid double close on cleanup */
}
if(host)
OPENSSL_free(host);
if(port)
OPENSSL_free(port);
if(path)
OPENSSL_free(path);
return resp;
}
/* find the issuer certificate without lookups */
NOEXPORT X509 *get_current_issuer(X509_STORE_CTX *callback_ctx) {
STACK_OF(X509) *chain;
int depth;
chain=X509_STORE_CTX_get0_chain(callback_ctx);
depth=X509_STORE_CTX_get_error_depth(callback_ctx);
if(depth<sk_X509_num(chain)-1) /* not the root CA cert */
++depth; /* index of the issuer cert */
return sk_X509_value(chain, depth);
}
NOEXPORT void log_time(const int level, const char *txt, ASN1_TIME *t) {
char *cp;
BIO *bio;
int n;
if(!t)
return;
bio=BIO_new(BIO_s_mem());
if(!bio)
return;
ASN1_TIME_print(bio, t);
n=BIO_pending(bio);
cp=str_alloc((size_t)n+1);
n=BIO_read(bio, cp, n);
if(n<0) {
BIO_free(bio);
str_free(cp);
return;
}
cp[n]='\0';
BIO_free(bio);
s_log(level, "%s: %s", txt, cp);
str_free(cp);
}
#endif /* !defined(OPENSSL_NO_OCSP) */
void print_client_CA_list(const STACK_OF(X509_NAME) *ca_dn) {
char *ca_name;
int n, i;
if(!ca_dn) {
s_log(LOG_INFO, "No client CA list");
return;
}
n=sk_X509_NAME_num(ca_dn);
if(n==0) {
s_log(LOG_INFO, "Empty client CA list");
return;
}
for(i=0; i<n; ++i) {
ca_name=X509_NAME2text(sk_X509_NAME_value(ca_dn, i));
s_log(LOG_INFO, "Client CA: %s", ca_name);
str_free(ca_name);
}
}
char *X509_NAME2text(X509_NAME *name) {
char *text;
BIO *bio;
int n;
bio=BIO_new(BIO_s_mem());
if(!bio)
return str_dup("BIO_new() failed");
X509_NAME_print_ex(bio, name, 0,
XN_FLAG_ONELINE & ~ASN1_STRFLGS_ESC_MSB & ~XN_FLAG_SPC_EQ);
n=BIO_pending(bio);
text=str_alloc((size_t)n+1);
n=BIO_read(bio, text, n);
if(n<0) {
BIO_free(bio);
str_free(text);
return str_dup("BIO_read() failed");
}
text[n]='\0';
BIO_free(bio);
return text;
}
/* end of verify.c */
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