Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 295 insertions, 0 deletions

diff --git a/src/journal-remote/microhttpd-util.c b/src/journal-remote/microhttpd-util.c
new file mode 100644
index 0000000..c1e35b7
--- /dev/null
+++ b/src/journal-remote/microhttpd-util.c
@@ -0,0 +1,295 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <stddef.h>
+#include <stdio.h>
+
+#if HAVE_GNUTLS
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+#endif
+
+#include "alloc-util.h"
+#include "log.h"
+#include "macro.h"
+#include "microhttpd-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+void microhttpd_logger(void *arg, const char *fmt, va_list ap) {
+        char *f;
+
+        f = strjoina("microhttpd: ", fmt);
+
+        DISABLE_WARNING_FORMAT_NONLITERAL;
+        log_internalv(LOG_INFO, 0, NULL, 0, NULL, f, ap);
+        REENABLE_WARNING;
+}
+
+int mhd_respond_internal(
+                struct MHD_Connection *connection,
+                enum MHD_RequestTerminationCode code,
+                const char *buffer,
+                size_t size,
+                enum MHD_ResponseMemoryMode mode) {
+
+        assert(connection);
+
+        _cleanup_(MHD_destroy_responsep) struct MHD_Response *response
+                = MHD_create_response_from_buffer(size, (char*) buffer, mode);
+        if (!response)
+                return MHD_NO;
+
+        log_debug("Queueing response %u: %s", code, buffer);
+        if (MHD_add_response_header(response, "Content-Type", "text/plain") == MHD_NO)
+                return MHD_NO;
+        return MHD_queue_response(connection, code, response);
+}
+
+int mhd_respond_oom(struct MHD_Connection *connection) {
+        return mhd_respond(connection, MHD_HTTP_SERVICE_UNAVAILABLE, "Out of memory.");
+}
+
+int mhd_respondf_internal(
+                struct MHD_Connection *connection,
+                int error,
+                enum MHD_RequestTerminationCode code,
+                const char *format, ...) {
+
+        char *m;
+        int r;
+        va_list ap;
+
+        assert(connection);
+        assert(format);
+
+        if (error < 0)
+                error = -error;
+        errno = -error;
+        va_start(ap, format);
+        r = vasprintf(&m, format, ap);
+        va_end(ap);
+
+        if (r < 0)
+                return respond_oom(connection);
+
+        return mhd_respond_internal(connection, code, m, r, MHD_RESPMEM_MUST_FREE);
+}
+
+#if HAVE_GNUTLS
+
+static struct {
+        const char *const names[4];
+        int level;
+        bool enabled;
+} gnutls_log_map[] = {
+        { {"0"},                  LOG_DEBUG },
+        { {"1", "audit"},         LOG_WARNING, true}, /* gnutls session audit */
+        { {"2", "assert"},        LOG_DEBUG },        /* gnutls assert log */
+        { {"3", "hsk", "ext"},    LOG_DEBUG },        /* gnutls handshake log */
+        { {"4", "rec"},           LOG_DEBUG },        /* gnutls record log */
+        { {"5", "dtls"},          LOG_DEBUG },        /* gnutls DTLS log */
+        { {"6", "buf"},           LOG_DEBUG },
+        { {"7", "write", "read"}, LOG_DEBUG },
+        { {"8"},                  LOG_DEBUG },
+        { {"9", "enc", "int"},    LOG_DEBUG },
+};
+
+static void log_func_gnutls(int level, const char *message) {
+        assert_se(message);
+
+        if (0 <= level && level < (int) ELEMENTSOF(gnutls_log_map)) {
+                if (gnutls_log_map[level].enabled)
+                        log_internal(gnutls_log_map[level].level, 0, NULL, 0, NULL, "gnutls %d/%s: %s", level, gnutls_log_map[level].names[1], message);
+        } else {
+                log_debug("Received GNUTLS message with unknown level %d.", level);
+                log_internal(LOG_DEBUG, 0, NULL, 0, NULL, "gnutls: %s", message);
+        }
+}
+
+static void log_reset_gnutls_level(void) {
+        int i;
+
+        for (i = ELEMENTSOF(gnutls_log_map) - 1; i >= 0; i--)
+                if (gnutls_log_map[i].enabled) {
+                        log_debug("Setting gnutls log level to %d", i);
+                        gnutls_global_set_log_level(i);
+                        break;
+                }
+}
+
+static int log_enable_gnutls_category(const char *cat) {
+        unsigned i;
+
+        if (streq(cat, "all")) {
+                for (i = 0; i < ELEMENTSOF(gnutls_log_map); i++)
+                        gnutls_log_map[i].enabled = true;
+                log_reset_gnutls_level();
+                return 0;
+        } else
+                for (i = 0; i < ELEMENTSOF(gnutls_log_map); i++)
+                        if (strv_contains((char**)gnutls_log_map[i].names, cat)) {
+                                gnutls_log_map[i].enabled = true;
+                                log_reset_gnutls_level();
+                                return 0;
+                        }
+        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No such log category: %s", cat);
+}
+
+int setup_gnutls_logger(char **categories) {
+        int r;
+
+        gnutls_global_set_log_function(log_func_gnutls);
+
+        if (categories)
+                STRV_FOREACH(cat, categories) {
+                        r = log_enable_gnutls_category(*cat);
+                        if (r < 0)
+                                return r;
+                }
+        else
+                log_reset_gnutls_level();
+
+        return 0;
+}
+
+static int verify_cert_authorized(gnutls_session_t session) {
+        unsigned status;
+        gnutls_certificate_type_t type;
+        gnutls_datum_t out;
+        int r;
+
+        r = gnutls_certificate_verify_peers2(session, &status);
+        if (r < 0)
+                return log_error_errno(r, "gnutls_certificate_verify_peers2 failed: %m");
+
+        type = gnutls_certificate_type_get(session);
+        r = gnutls_certificate_verification_status_print(status, type, &out, 0);
+        if (r < 0)
+                return log_error_errno(r, "gnutls_certificate_verification_status_print failed: %m");
+
+        log_debug("Certificate status: %s", out.data);
+        gnutls_free(out.data);
+
+        return status == 0 ? 0 : -EPERM;
+}
+
+static int get_client_cert(gnutls_session_t session, gnutls_x509_crt_t *client_cert) {
+        const gnutls_datum_t *pcert;
+        unsigned listsize;
+        gnutls_x509_crt_t cert;
+        int r;
+
+        assert(session);
+        assert(client_cert);
+
+        pcert = gnutls_certificate_get_peers(session, &listsize);
+        if (!pcert || !listsize)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Failed to retrieve certificate chain");
+
+        r = gnutls_x509_crt_init(&cert);
+        if (r < 0) {
+                log_error("Failed to initialize client certificate");
+                return r;
+        }
+
+        /* Note that by passing values between 0 and listsize here, you
+           can get access to the CA's certs */
+        r = gnutls_x509_crt_import(cert, &pcert[0], GNUTLS_X509_FMT_DER);
+        if (r < 0) {
+                log_error("Failed to import client certificate");
+                gnutls_x509_crt_deinit(cert);
+                return r;
+        }
+
+        *client_cert = cert;
+        return 0;
+}
+
+static int get_auth_dn(gnutls_x509_crt_t client_cert, char **buf) {
+        size_t len = 0;
+        int r;
+
+        assert(buf);
+        assert(*buf == NULL);
+
+        r = gnutls_x509_crt_get_dn(client_cert, NULL, &len);
+        if (r != GNUTLS_E_SHORT_MEMORY_BUFFER) {
+                log_error("gnutls_x509_crt_get_dn failed");
+                return r;
+        }
+
+        *buf = malloc(len);
+        if (!*buf)
+                return log_oom();
+
+        gnutls_x509_crt_get_dn(client_cert, *buf, &len);
+        return 0;
+}
+
+static void gnutls_x509_crt_deinitp(gnutls_x509_crt_t *p) {
+        gnutls_x509_crt_deinit(*p);
+}
+
+int check_permissions(struct MHD_Connection *connection, int *code, char **hostname) {
+        const union MHD_ConnectionInfo *ci;
+        gnutls_session_t session;
+        _cleanup_(gnutls_x509_crt_deinitp) gnutls_x509_crt_t client_cert = NULL;
+        _cleanup_free_ char *buf = NULL;
+        int r;
+
+        assert(connection);
+        assert(code);
+
+        *code = 0;
+
+        ci = MHD_get_connection_info(connection,
+                                     MHD_CONNECTION_INFO_GNUTLS_SESSION);
+        if (!ci) {
+                log_error("MHD_get_connection_info failed: session is unencrypted");
+                *code = mhd_respond(connection, MHD_HTTP_FORBIDDEN,
+                                    "Encrypted connection is required");
+                return -EPERM;
+        }
+        session = ci->tls_session;
+        assert(session);
+
+        r = get_client_cert(session, &client_cert);
+        if (r < 0) {
+                *code = mhd_respond(connection, MHD_HTTP_UNAUTHORIZED,
+                                    "Authorization through certificate is required");
+                return -EPERM;
+        }
+
+        r = get_auth_dn(client_cert, &buf);
+        if (r < 0) {
+                *code = mhd_respond(connection, MHD_HTTP_UNAUTHORIZED,
+                                    "Failed to determine distinguished name from certificate");
+                return -EPERM;
+        }
+
+        log_debug("Connection from %s", buf);
+
+        if (hostname)
+                *hostname = TAKE_PTR(buf);
+
+        r = verify_cert_authorized(session);
+        if (r < 0) {
+                log_warning("Client is not authorized");
+                *code = mhd_respond(connection, MHD_HTTP_UNAUTHORIZED,
+                                    "Client certificate not signed by recognized authority");
+        }
+        return r;
+}
+
+#else
+_noreturn_ int check_permissions(struct MHD_Connection *connection, int *code, char **hostname) {
+        assert_not_reached();
+}
+
+int setup_gnutls_logger(char **categories) {
+        if (categories)
+                log_notice("Ignoring specified gnutls logging categories — gnutls not available.");
+        return 0;
+}
+#endif