Daan De Meyer
d158595dc7
Each dlopen_*() wrapper kept its dl handle as a file-scope 'static void *xxx_dl = NULL;' even though only the wrapper itself ever referenced it. Move each one inside the corresponding function so its scope matches its actual use, leaving the rest of each translation unit free of the unused file-scope name. In pcre2-util.c the assert(pcre2_dl) in pattern_matches_and_log() becomes assert(sym_pcre2_match), which carries the same invariant (pattern_compile_and_log() ran dlopen_pcre2()).
375 lines
12 KiB
C
375 lines
12 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <stdio.h>
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#include "sd-dlopen.h"
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#include "alloc-util.h"
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#include "gnutls-util.h"
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#include "log.h"
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#include "microhttpd-util.h"
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#include "string-util.h"
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#include "strv.h"
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#if HAVE_MICROHTTPD
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DLSYM_PROTOTYPE(MHD_add_response_header) = NULL;
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DLSYM_PROTOTYPE(MHD_create_response_from_buffer) = NULL;
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DLSYM_PROTOTYPE(MHD_create_response_from_callback) = NULL;
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#if MHD_VERSION < 0x00094203
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DLSYM_PROTOTYPE(MHD_create_response_from_fd_at_offset) = NULL;
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#else
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DLSYM_PROTOTYPE(MHD_create_response_from_fd_at_offset64) = NULL;
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#endif
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DLSYM_PROTOTYPE(MHD_destroy_response) = NULL;
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DLSYM_PROTOTYPE(MHD_get_connection_info) = NULL;
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DLSYM_PROTOTYPE(MHD_get_connection_values) = NULL;
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DLSYM_PROTOTYPE(MHD_get_daemon_info) = NULL;
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DLSYM_PROTOTYPE(MHD_get_timeout) = NULL;
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DLSYM_PROTOTYPE(MHD_lookup_connection_value) = NULL;
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DLSYM_PROTOTYPE(MHD_queue_response) = NULL;
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DLSYM_PROTOTYPE(MHD_run) = NULL;
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DLSYM_PROTOTYPE(MHD_start_daemon) = NULL;
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DLSYM_PROTOTYPE(MHD_stop_daemon) = NULL;
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#endif
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int dlopen_microhttpd(int log_level) {
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#if HAVE_MICROHTTPD
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static void *microhttpd_dl = NULL;
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SD_ELF_NOTE_DLOPEN(
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"microhttpd",
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"Support for embedded HTTP server via libmicrohttpd",
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SD_ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
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"libmicrohttpd.so.12");
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return dlopen_many_sym_or_warn(
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µhttpd_dl,
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"libmicrohttpd.so.12",
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log_level,
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DLSYM_ARG(MHD_add_response_header),
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DLSYM_ARG(MHD_create_response_from_buffer),
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DLSYM_ARG(MHD_create_response_from_callback),
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#if MHD_VERSION < 0x00094203
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DLSYM_ARG(MHD_create_response_from_fd_at_offset),
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#else
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DLSYM_ARG(MHD_create_response_from_fd_at_offset64),
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#endif
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DLSYM_ARG(MHD_destroy_response),
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DLSYM_ARG(MHD_get_connection_info),
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DLSYM_ARG(MHD_get_connection_values),
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DLSYM_ARG(MHD_get_daemon_info),
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DLSYM_ARG(MHD_get_timeout),
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DLSYM_ARG(MHD_lookup_connection_value),
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DLSYM_ARG(MHD_queue_response),
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DLSYM_ARG(MHD_run),
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DLSYM_ARG(MHD_start_daemon),
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DLSYM_ARG(MHD_stop_daemon));
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#else
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return log_full_errno(log_level, SYNTHETIC_ERRNO(EOPNOTSUPP),
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"libmicrohttpd support is not compiled in.");
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#endif
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}
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#if HAVE_MICROHTTPD
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void microhttpd_logger(void *arg, const char *fmt, va_list ap) {
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char *f;
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f = strjoina("microhttpd: ", fmt);
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DISABLE_WARNING_FORMAT_NONLITERAL;
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log_internalv(LOG_INFO, 0, NULL, 0, NULL, f, ap);
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REENABLE_WARNING;
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}
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int mhd_respond_internal(
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struct MHD_Connection *connection,
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enum MHD_RequestTerminationCode code,
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const char *encoding,
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const char *buffer,
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size_t size,
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enum MHD_ResponseMemoryMode mode) {
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assert(connection);
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_cleanup_(MHD_destroy_responsep) struct MHD_Response *response
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= sym_MHD_create_response_from_buffer(size, (char*) buffer, mode);
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if (!response)
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return MHD_NO;
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log_debug("Queueing response %u: %s", code, buffer);
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if (encoding)
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if (sym_MHD_add_response_header(response, "Accept-Encoding", encoding) == MHD_NO)
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return MHD_NO;
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if (sym_MHD_add_response_header(response, "Content-Type", "text/plain") == MHD_NO)
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return MHD_NO;
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return sym_MHD_queue_response(connection, code, response);
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}
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int mhd_respond_oom(struct MHD_Connection *connection) {
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return mhd_respond(connection, MHD_HTTP_SERVICE_UNAVAILABLE, "Out of memory.");
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}
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int mhd_respondf_internal(
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struct MHD_Connection *connection,
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int error,
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enum MHD_RequestTerminationCode code,
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const char *encoding,
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const char *format, ...) {
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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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errno = ERRNO_VALUE(error);
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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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return mhd_respond_internal(connection, code, encoding, m, r, MHD_RESPMEM_MUST_FREE);
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}
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#if HAVE_GNUTLS
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static struct {
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const char *const names[4];
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int level;
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bool enabled;
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} gnutls_log_map[] = {
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{ {"0"}, LOG_DEBUG },
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{ {"1", "audit"}, LOG_WARNING, true}, /* gnutls session audit */
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{ {"2", "assert"}, LOG_DEBUG }, /* gnutls assert log */
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{ {"3", "hsk", "ext"}, LOG_DEBUG }, /* gnutls handshake log */
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{ {"4", "rec"}, LOG_DEBUG }, /* gnutls record log */
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{ {"5", "dtls"}, LOG_DEBUG }, /* gnutls DTLS log */
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{ {"6", "buf"}, LOG_DEBUG },
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{ {"7", "write", "read"}, LOG_DEBUG },
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{ {"8"}, LOG_DEBUG },
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{ {"9", "enc", "int"}, LOG_DEBUG },
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};
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static void log_func_gnutls(int level, const char *message) {
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assert_se(message);
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if (0 <= level && level < (int) ELEMENTSOF(gnutls_log_map)) {
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if (gnutls_log_map[level].enabled)
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log_internal(gnutls_log_map[level].level, 0, NULL, 0, NULL, "gnutls %d/%s: %s", level, gnutls_log_map[level].names[1], message);
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} else {
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log_debug("Received GNUTLS message with unknown level %d.", level);
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log_internal(LOG_DEBUG, 0, NULL, 0, NULL, "gnutls: %s", message);
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}
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}
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static void log_reset_gnutls_level(void) {
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int i;
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for (i = ELEMENTSOF(gnutls_log_map) - 1; i >= 0; i--)
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if (gnutls_log_map[i].enabled) {
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log_debug("Setting gnutls log level to %d", i);
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sym_gnutls_global_set_log_level(i);
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break;
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}
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}
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static int log_enable_gnutls_category(const char *cat) {
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if (streq(cat, "all")) {
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FOREACH_ELEMENT(entry, gnutls_log_map)
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entry->enabled = true;
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log_reset_gnutls_level();
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return 0;
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} else
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FOREACH_ELEMENT(entry, gnutls_log_map)
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if (strv_contains((char**)entry->names, cat)) {
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entry->enabled = true;
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log_reset_gnutls_level();
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return 0;
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}
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No such log category: %s", cat);
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}
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int setup_gnutls_logger(char **categories) {
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int r;
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r = dlopen_gnutls(LOG_DEBUG);
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if (r < 0) {
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if (categories)
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log_notice("Ignoring specified gnutls logging categories -- gnutls not available.");
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else
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log_debug("GnuTLS not available, skipping logger setup.");
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return 0;
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}
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sym_gnutls_global_set_log_function(log_func_gnutls);
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if (categories)
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STRV_FOREACH(cat, categories) {
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r = log_enable_gnutls_category(*cat);
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if (r < 0)
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return r;
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}
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else
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log_reset_gnutls_level();
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return 0;
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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 = sym_gnutls_certificate_verify_peers2(session, &status);
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if (r < 0)
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return log_error_errno(r, "gnutls_certificate_verify_peers2 failed: %m");
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type = sym_gnutls_certificate_type_get(session);
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r = sym_gnutls_certificate_verification_status_print(status, type, &out, 0);
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if (r < 0)
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return log_error_errno(r, "gnutls_certificate_verification_status_print failed: %m");
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log_debug("Certificate status: %s", out.data);
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/* gnutls_free is declared as a function pointer variable (not a function), so sym_gnutls_free
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* ends up as a pointer-to-function-pointer and must be explicitly dereferenced to be called. */
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(*sym_gnutls_free)(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 = sym_gnutls_certificate_get_peers(session, &listsize);
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if (!pcert || !listsize)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Failed to retrieve certificate chain");
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r = sym_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 = sym_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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sym_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 = sym_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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sym_gnutls_x509_crt_get_dn(client_cert, *buf, &len);
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return 0;
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}
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static void gnutls_x509_crt_deinitp(gnutls_x509_crt_t *p) {
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assert(p);
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if (*p)
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sym_gnutls_x509_crt_deinit(*p);
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}
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int check_permissions(struct MHD_Connection *connection, int *code, char **hostname) {
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const union MHD_ConnectionInfo *ci;
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gnutls_session_t session;
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_cleanup_(gnutls_x509_crt_deinitp) gnutls_x509_crt_t client_cert = NULL;
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_cleanup_free_ char *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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r = dlopen_gnutls(LOG_ERR);
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if (r < 0)
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return r;
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ci = sym_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: session is unencrypted");
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*code = mhd_respond(connection, MHD_HTTP_FORBIDDEN,
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"Encrypted connection is required");
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return -EPERM;
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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 = mhd_respond(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 = mhd_respond(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_debug("Connection from %s", buf);
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if (hostname)
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*hostname = TAKE_PTR(buf);
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r = verify_cert_authorized(session);
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if (r < 0) {
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log_warning("Client is not authorized");
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*code = mhd_respond(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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_noreturn_ int check_permissions(struct MHD_Connection *connection, int *code, char **hostname) {
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assert_not_reached();
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}
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int setup_gnutls_logger(char **categories) {
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if (categories)
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log_notice("Ignoring specified gnutls logging categories — gnutls not available.");
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return 0;
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}
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#endif
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#endif
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