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/*
* uhttpd - Tiny single-threaded httpd - TLS helper
*
* Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "uhttpd.h"
#include "uhttpd-tls.h"
#include "uhttpd-utils.h"
#include <syslog.h>
#define dbg(...) syslog(LOG_INFO, __VA_ARGS__)
SSL_CTX * uh_tls_ctx_init(void)
{
SSL_CTX *c;
SSL_load_error_strings();
SSL_library_init();
#if TLS_IS_OPENSSL
if ((c = SSL_CTX_new(SSLv23_server_method())) != NULL)
#else
if ((c = SSL_CTX_new(TLSv1_server_method())) != NULL)
#endif
SSL_CTX_set_verify(c, SSL_VERIFY_NONE, NULL);
return c;
}
int uh_tls_ctx_cert(SSL_CTX *c, const char *file)
{
int rv;
if( (rv = SSL_CTX_use_certificate_file(c, file, SSL_FILETYPE_PEM)) < 1 )
rv = SSL_CTX_use_certificate_file(c, file, SSL_FILETYPE_ASN1);
return rv;
}
int uh_tls_ctx_key(SSL_CTX *c, const char *file)
{
int rv;
if( (rv = SSL_CTX_use_PrivateKey_file(c, file, SSL_FILETYPE_PEM)) < 1 )
rv = SSL_CTX_use_PrivateKey_file(c, file, SSL_FILETYPE_ASN1);
return rv;
}
void uh_tls_ctx_free(struct listener *l)
{
SSL_CTX_free(l->tls);
}
int uh_tls_client_accept(struct client *c)
{
int rv, err;
int fd = c->fd.fd;
if (!c->server || !c->server->tls)
{
c->tls = NULL;
return 1;
}
if ((c->tls = SSL_new(c->server->tls)))
{
if ((rv = SSL_set_fd(c->tls, fd)) < 1)
{
SSL_free(c->tls);
c->tls = NULL;
}
else
{
while (true)
{
rv = SSL_accept(c->tls);
err = SSL_get_error(c->tls, rv);
if ((rv != 1) &&
(err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE))
{
if (uh_socket_wait(fd, c->server->conf->network_timeout,
(err == SSL_ERROR_WANT_WRITE)))
{
D("TLS: accept(%d) = retry\n", fd);
continue;
}
D("TLS: accept(%d) = timeout\n", fd);
}
else if (rv == 1)
{
D("TLS: accept(%d) = %p\n", fd, c->tls);
return 1;
}
#ifdef TLS_IS_OPENSSL
D("TLS: accept(%d) = failed: %s\n",
fd, ERR_error_string(ERR_get_error(), NULL));
#endif
SSL_free(c->tls);
c->tls = NULL;
break;
}
}
}
return 0;
}
int uh_tls_client_recv(struct client *c, char *buf, int len)
{
int rv = SSL_read(c->tls, buf, len);
int err = SSL_get_error(c->tls, 0);
if ((rv == -1) && (err == SSL_ERROR_WANT_READ))
{
D("TLS: recv(%d, %d) = retry\n", c->fd.fd, len);
errno = EAGAIN;
return -1;
}
D("TLS: recv(%d, %d) = %d\n", c->fd.fd, len, rv);
return rv;
}
int uh_tls_client_send(struct client *c, const char *buf, int len)
{
int rv = SSL_write(c->tls, buf, len);
int err = SSL_get_error(c->tls, 0);
if ((rv == -1) && (err == SSL_ERROR_WANT_WRITE))
{
D("TLS: send(%d, %d) = retry\n", c->fd.fd, len);
errno = EAGAIN;
return -1;
}
D("TLS: send(%d, %d) = %d\n", c->fd.fd, len, rv);
return rv;
}
void uh_tls_client_close(struct client *c)
{
if (c->tls)
{
D("TLS: close(%d)\n", c->fd.fd);
SSL_shutdown(c->tls);
SSL_free(c->tls);
c->tls = NULL;
}
}
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