f12be7e8ca
If --trust=ca.crt is used, only clients presenting certificates signed by the ca will be allowed to proceed. No hostname matching is performed, so any client wielding a signed certificate will be authorized. Error functions are moved from journal-gateway to microhttp-util and made non-static, since now they are used in two source files.
266 lines
7.6 KiB
C
266 lines
7.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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Copyright 2012 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include "microhttpd-util.h"
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#include "log.h"
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#include "macro.h"
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#include "util.h"
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#ifdef HAVE_GNUTLS
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#include <gnutls/gnutls.h>
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#include <gnutls/x509.h>
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#endif
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void microhttpd_logger(void *arg, const char *fmt, va_list ap) {
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_cleanup_free_ char *f = NULL;
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if (asprintf(&f, "microhttpd: %s", fmt) <= 0) {
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log_oom();
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return;
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}
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DISABLE_WARNING_FORMAT_NONLITERAL;
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log_metav(LOG_INFO, NULL, 0, NULL, f, ap);
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REENABLE_WARNING;
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}
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int respond_oom_internal(struct MHD_Connection *connection) {
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struct MHD_Response *response;
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const char m[] = "Out of memory.\n";
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int ret;
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assert(connection);
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response = MHD_create_response_from_buffer(sizeof(m)-1, (char*) m, MHD_RESPMEM_PERSISTENT);
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if (!response)
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return MHD_NO;
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MHD_add_response_header(response, "Content-Type", "text/plain");
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ret = MHD_queue_response(connection, MHD_HTTP_SERVICE_UNAVAILABLE, response);
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MHD_destroy_response(response);
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return ret;
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}
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_printf_(3,4)
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int respond_error(struct MHD_Connection *connection,
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unsigned code,
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const char *format, ...) {
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struct MHD_Response *response;
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char *m;
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int r;
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va_list ap;
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assert(connection);
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assert(format);
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va_start(ap, format);
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r = vasprintf(&m, format, ap);
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va_end(ap);
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if (r < 0)
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return respond_oom(connection);
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response = MHD_create_response_from_buffer(strlen(m), m, MHD_RESPMEM_MUST_FREE);
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if (!response) {
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free(m);
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return respond_oom(connection);
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}
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log_debug("queing response %u: %s", code, m);
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MHD_add_response_header(response, "Content-Type", "text/plain");
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r = MHD_queue_response(connection, code, response);
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MHD_destroy_response(response);
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return r;
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}
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#ifdef HAVE_GNUTLS
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static int log_level_map[] = {
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LOG_DEBUG,
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LOG_WARNING, /* gnutls session audit */
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LOG_DEBUG, /* gnutls debug log */
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LOG_WARNING, /* gnutls assert log */
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LOG_INFO, /* gnutls handshake log */
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LOG_DEBUG, /* gnutls record log */
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LOG_DEBUG, /* gnutls dtls log */
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LOG_DEBUG,
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LOG_DEBUG,
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LOG_DEBUG,
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LOG_DEBUG, /* gnutls hard log */
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LOG_DEBUG, /* gnutls read log */
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LOG_DEBUG, /* gnutls write log */
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LOG_DEBUG, /* gnutls io log */
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LOG_DEBUG, /* gnutls buffers log */
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};
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void log_func_gnutls(int level, const char *message) {
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int ourlevel;
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assert_se(message);
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if (0 <= level && level < (int) ELEMENTSOF(log_level_map))
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ourlevel = log_level_map[level];
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else
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level = LOG_DEBUG;
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log_meta(ourlevel, NULL, 0, NULL, "gnutls: %s", message);
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}
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static int verify_cert_authorized(gnutls_session_t session) {
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unsigned status;
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gnutls_certificate_type_t type;
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gnutls_datum_t out;
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int r;
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r = gnutls_certificate_verify_peers2(session, &status);
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if (r < 0) {
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log_error("gnutls_certificate_verify_peers2 failed: %s", strerror(-r));
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return r;
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}
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type = gnutls_certificate_type_get(session);
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r = gnutls_certificate_verification_status_print(status, type, &out, 0);
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if (r < 0) {
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log_error("gnutls_certificate_verification_status_print failed: %s", strerror(-r));
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return r;
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}
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log_info("Certificate status: %s", out.data);
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return status == 0 ? 0 : -EPERM;
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}
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static int get_client_cert(gnutls_session_t session, gnutls_x509_crt_t *client_cert) {
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const gnutls_datum_t *pcert;
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unsigned listsize;
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gnutls_x509_crt_t cert;
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int r;
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assert(session);
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assert(client_cert);
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pcert = gnutls_certificate_get_peers(session, &listsize);
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if (!pcert || !listsize) {
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log_error("Failed to retrieve certificate chain");
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return -EINVAL;
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}
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r = gnutls_x509_crt_init(&cert);
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if (r < 0) {
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log_error("Failed to initialize client certificate");
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return r;
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}
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/* Note that by passing values between 0 and listsize here, you
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can get access to the CA's certs */
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r = gnutls_x509_crt_import(cert, &pcert[0], GNUTLS_X509_FMT_DER);
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if (r < 0) {
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log_error("Failed to import client certificate");
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gnutls_x509_crt_deinit(cert);
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return r;
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}
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*client_cert = cert;
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return 0;
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}
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static int get_auth_dn(gnutls_x509_crt_t client_cert, char **buf) {
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size_t len = 0;
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int r;
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assert(buf);
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assert(*buf == NULL);
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r = gnutls_x509_crt_get_dn(client_cert, NULL, &len);
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if (r != GNUTLS_E_SHORT_MEMORY_BUFFER) {
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log_error("gnutls_x509_crt_get_dn failed");
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return r;
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}
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*buf = malloc(len);
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if (!*buf)
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return log_oom();
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gnutls_x509_crt_get_dn(client_cert, *buf, &len);
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return 0;
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}
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int check_permissions(struct MHD_Connection *connection, int *code) {
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const union MHD_ConnectionInfo *ci;
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gnutls_session_t session;
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gnutls_x509_crt_t client_cert;
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char _cleanup_free_ *buf = NULL;
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int r;
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assert(connection);
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assert(code);
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*code = 0;
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ci = MHD_get_connection_info(connection,
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MHD_CONNECTION_INFO_GNUTLS_SESSION);
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if (!ci) {
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log_error("MHD_get_connection_info failed");
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return -EINVAL;
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}
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session = ci->tls_session;
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assert(session);
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r = get_client_cert(session, &client_cert);
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if (r < 0) {
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*code = respond_error(connection, MHD_HTTP_UNAUTHORIZED,
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"Authorization through certificate is required");
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return -EPERM;
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}
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r = get_auth_dn(client_cert, &buf);
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if (r < 0) {
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*code = respond_error(connection, MHD_HTTP_UNAUTHORIZED,
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"Failed to determine distinguished name from certificate");
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return -EPERM;
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}
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log_info("Connection from %s", buf);
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r = verify_cert_authorized(session);
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if (r < 0) {
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log_error("Client is not authorized");
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*code = respond_error(connection, MHD_HTTP_UNAUTHORIZED,
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"Client certificate not signed by recognized authority");
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}
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return r;
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}
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#else
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int check_permissions(struct MHD_Connection *connection, int *code) {
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return -EPERM;
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}
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#endif
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