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journal-gatewayd: check if certificate is signed by CA
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.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
parent
cafc7f9130
commit
f12be7e8ca
@ -712,7 +712,7 @@ AM_CONDITIONAL(HAVE_MICROHTTPD, [test "$have_microhttpd" = "yes"])
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have_gnutls=no
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AC_ARG_ENABLE(gnutls, AS_HELP_STRING([--disable-gnutls], [disable gnutls support]))
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if test "x$enable_gnutls" != "xno"; then
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PKG_CHECK_MODULES(GNUTLS, [gnutls],
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PKG_CHECK_MODULES(GNUTLS, [gnutls >= 3.1.4],
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[AC_DEFINE(HAVE_GNUTLS, 1, [Define if gnutls is available]) have_gnutls=yes], have_gnutls=no)
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if test "x$have_gnutls" = xno -a "x$enable_gnutls" = xyes; then
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AC_MSG_ERROR([*** gnutls support requested but libraries not found])
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@ -27,6 +27,10 @@
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#include <microhttpd.h>
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#ifdef HAVE_GNUTLS
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#include <gnutls/gnutls.h>
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#endif
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#include "log.h"
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#include "util.h"
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#include "sd-journal.h"
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@ -38,6 +42,10 @@
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#include "build.h"
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#include "fileio.h"
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static char *key_pem = NULL;
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static char *cert_pem = NULL;
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static char *trust_pem = NULL;
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typedef struct RequestMeta {
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sd_journal *journal;
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@ -111,60 +119,6 @@ static int open_journal(RequestMeta *m) {
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return sd_journal_open(&m->journal, SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_SYSTEM);
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}
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static 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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#define respond_oom(connection) log_oom(), respond_oom_internal(connection)
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_printf_(3,4)
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static int respond_error(
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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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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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static ssize_t request_reader_entries(
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void *cls,
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uint64_t pos,
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@ -859,6 +813,7 @@ static int request_handler(
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const char *upload_data,
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size_t *upload_data_size,
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void **connection_cls) {
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int r, code;
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assert(connection);
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assert(connection_cls);
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@ -876,6 +831,12 @@ static int request_handler(
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return MHD_YES;
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}
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if (trust_pem) {
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r = check_permissions(connection, &code);
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if (r < 0)
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return code;
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}
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if (streq(url, "/"))
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return request_handler_redirect(connection, "/browse");
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@ -908,10 +869,6 @@ static int help(void) {
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return 0;
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}
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static char *key_pem = NULL;
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static char *cert_pem = NULL;
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static char *trust_pem = NULL;
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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@ -973,6 +930,7 @@ static int parse_argv(int argc, char *argv[]) {
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break;
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case ARG_TRUST:
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#ifdef HAVE_GNUTLS
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if (trust_pem) {
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log_error("CA certificate file specified twice");
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return -EINVAL;
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@ -984,6 +942,9 @@ static int parse_argv(int argc, char *argv[]) {
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}
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assert(trust_pem);
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break;
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#else
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log_error("Option --trust is not available.");
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#endif
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case '?':
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return -EINVAL;
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@ -3,6 +3,7 @@
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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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@ -21,12 +22,18 @@
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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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@ -40,6 +47,59 @@ void microhttpd_logger(void *arg, const char *fmt, va_list 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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@ -73,4 +133,133 @@ void log_func_gnutls(int level, const char *message) {
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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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@ -22,14 +22,24 @@
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#pragma once
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#include <stdarg.h>
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#include <microhttpd.h>
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#include "macro.h"
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void microhttpd_logger(void *arg, const char *fmt, va_list ap) _printf_(2, 0);
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#ifdef HAVE_GNUTLS
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#include <gnutls/gnutls.h>
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int respond_oom_internal(struct MHD_Connection *connection);
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/* respond_oom() must be usable with return, hence this form. */
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#define respond_oom(connection) log_oom(), respond_oom_internal(connection)
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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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int check_permissions(struct MHD_Connection *connection, int *code);
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#ifdef HAVE_GNUTLS
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void log_func_gnutls(int level, const char *message);
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/* This is additionally filtered by our internal log level, so it
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