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* "browse_callback", and parts of "main".
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* Everything else is
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* Copyright © 2008-2011 Teddy Hogeborn
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* Copyright © 2008-2011 Björn Påhlsson
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* Copyright © 2008-2012 Teddy Hogeborn
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* Copyright © 2008-2012 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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stdout, ferror(), remove() */
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#include <stdint.h> /* uint16_t, uint32_t */
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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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strtof(), abort() */
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG() */
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#include <grp.h> /* setgroups() */
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#include <sys/klog.h> /* klogctl() */
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/* Function to use when printing errors */
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void perror_plus(const char *print_text){
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fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
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perror(print_text);
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__attribute__((format (gnu_printf, 2, 3)))
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int fprintf_plus(FILE *stream, const char *format, ...){
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va_start (ap, format);
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/* Add server to set of servers to retry periodically */
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int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
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bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
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server *new_server = malloc(sizeof(server));
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if(new_server == NULL){
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perror_plus("malloc");
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*new_server = (server){ .ip = strdup(ip),
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/* Spurious warning from -Wint-to-pointer-cast */
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gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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/* This casting via intptr_t is to eliminate warning about casting
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an int to a pointer type. This is exactly how the GnuTLS Guile
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function "set-session-transport-fd!" does it. */
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gnutls_transport_set_ptr(session,
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(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
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avahi_simple_poll_quit(mc.simple_poll);
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ret = add_server(ip, port, interface,
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avahi_proto_to_af(proto));
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if(not add_server(ip, port, interface,
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avahi_proto_to_af(proto))){
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fprintf_plus(stderr, "Failed to add server \"%s\" to server"
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pid_t hook_pid = fork();
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if(hook_pid == 0){
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/* Raise privileges */
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perror_plus("seteuid");
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/* Raise privileges even more */
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perror_plus("setuid");
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perror_plus("setgid");
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/* Reset supplementary groups */
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ret = setgroups(0, NULL);
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perror_plus("setgroups");
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dup2(devnull, STDIN_FILENO);
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close(devnull);
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dup2(STDERR_FILENO, STDOUT_FILENO);
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_exit(EX_OSERR);
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free(delaystring);
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ret = execl(fullname, direntry->d_name, mode, NULL);
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perror_plus("execl");
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if(connect_to != NULL){
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ret = setenv("CONNECT", connect_to, 1);
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perror_plus("setenv");
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if(execl(fullname, direntry->d_name, mode, NULL) == -1){
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perror_plus("execl");
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_exit(EXIT_FAILURE);
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if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
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{ .name = "retry", .key = 132,
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.arg = "SECONDS",
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.doc = "Retry interval used when denied by the mandos server",
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.doc = "Retry interval used when denied by the Mandos server",
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{ .name = "network-hook-dir", .key = 133,
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
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case 'V': /* --version */
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fprintf_plus(state->out_stream,
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"Mandos plugin mandos-client: ");
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fprintf_plus(state->out_stream, "%s\n", argp_program_version);
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exit(argp_err_exit_status);
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/* Work around Debian bug #633582:
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<http://bugs.debian.org/633582> */
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/* Re-raise priviliges */
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ret = seteuid(0);
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perror_plus("seteuid");
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if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
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int seckey_fd = open(seckey, O_RDONLY);
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if(seckey_fd == -1){
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perror_plus("open");
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ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
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perror_plus("fstat");
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if(S_ISREG(st.st_mode)
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and st.st_uid == 0 and st.st_gid == 0){
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ret = fchown(seckey_fd, uid, gid);
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perror_plus("fchown");
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TEMP_FAILURE_RETRY(close(seckey_fd));
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if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
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int pubkey_fd = open(pubkey, O_RDONLY);
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if(pubkey_fd == -1){
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perror_plus("open");
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ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
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perror_plus("fstat");
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if(S_ISREG(st.st_mode)
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and st.st_uid == 0 and st.st_gid == 0){
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ret = fchown(pubkey_fd, uid, gid);
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perror_plus("fchown");
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TEMP_FAILURE_RETRY(close(pubkey_fd));
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/* Lower privileges */
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perror_plus("seteuid");
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/* Run network hooks */
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/* Re-raise priviliges */
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perror_plus("seteuid");
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if(not run_network_hooks("start", interface, delay)){
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if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
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int seckey_fd = open(seckey, O_RDONLY);
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if(seckey_fd == -1){
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perror_plus("open");
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ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
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perror_plus("fstat");
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if(S_ISREG(st.st_mode)
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and st.st_uid == 0 and st.st_gid == 0){
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ret = fchown(seckey_fd, uid, gid);
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perror_plus("fchown");
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TEMP_FAILURE_RETRY(close(seckey_fd));
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if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
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int pubkey_fd = open(pubkey, O_RDONLY);
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if(pubkey_fd == -1){
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perror_plus("open");
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ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
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perror_plus("fstat");
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if(S_ISREG(st.st_mode)
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and st.st_uid == 0 and st.st_gid == 0){
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ret = fchown(pubkey_fd, uid, gid);
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perror_plus("fchown");
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TEMP_FAILURE_RETRY(close(pubkey_fd));
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/* Lower privileges */
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ret = seteuid(uid);
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/* Run network hooks */
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run_network_hooks("stop", interface, delay);
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/* Re-raise priviliges */
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perror_plus("seteuid");
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perror_plus("seteuid");
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/* Run network hooks */
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run_network_hooks("stop", interface, delay);
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/* Take down the network interface */
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if(take_down_interface and geteuid() == 0){
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ret = ioctl(sd, SIOCGIFFLAGS, &network);