/mandos/trunk : revision 655

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* "browse_callback", and parts of "main".

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*

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* Everything else is

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*

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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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*/

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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

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strtoimax() */

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#include <assert.h> /* assert() */

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#include <errno.h> /* perror(), errno,

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program_invocation_short_name */

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#include <time.h> /* nanosleep(), time(), sleep() */

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*/

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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

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getuid(), getgid(), seteuid(),

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setgid(), pause() */

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setgid(), pause(), _exit() */

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#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

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#include <iso646.h> /* not, or, and */

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#include <argp.h> /* struct argp_option, error_t, struct

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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 <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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#include <sys/klog.h> /* klogctl() */

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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#include <gpgme.h> /* All GPGME types, constants and

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const char *argp_program_bug_address = "<mandos@recompile.se>";

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static const char sys_class_net[] = "/sys/class/net";

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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/* Doubly linked list that need to be circularly linked when used */

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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/* Used for passing in values through the Avahi callback functions */

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global context so signal handler can reach it*/

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mandos_context mc = { .simple_poll = NULL, .server = NULL,

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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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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int e = errno;

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fprintf(stderr, "Mandos plugin %s: ",

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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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_list ap;

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va_start (ap, format);

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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

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program_invocation_short_name));

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return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

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}

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/*

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* Make additional room in "buffer" for at least BUFFER_SIZE more

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* bytes. "buffer_capacity" is how much is currently allocated,

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* "buffer_length" is how much is already used.

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*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

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if(buffer == NULL){

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}

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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,

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AvahiIfIndex if_index,

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int af){

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bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

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int af, server **current_server){

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int ret;

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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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return -1;

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return false;

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}

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*new_server = (server){ .ip = strdup(ip),

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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*current_server = new_server;

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/* Place the new server last in the list */

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} else {

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new_server->next = mc.current_server;

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new_server->prev = mc.current_server->prev;

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new_server->next = *current_server;

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new_server->prev = (*current_server)->prev;

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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(*current_server)->prev = new_server;

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}

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ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

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ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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return false;

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}

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return 0;

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return true;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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static bool init_gpgme(const char *seckey, const char *pubkey,

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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* Helper function to insert pub and seckey to the engine keyring.

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_data_new_from_fd: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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rc = gpgme_op_import(mc->ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_op_import: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"Initializing GPGME\n");

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fprintf_plus(stderr, "Initializing GPGME\n");

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_engine_check_version: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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/* Set GPGME home directory for the OpenPGP engine only */

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_get_engine_info: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"Could not set GPGME home dir to %s\n", tempdir);

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fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

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tempdir);

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return false;

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}

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/* Create new GPGME "context" */

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rc = gpgme_new(&(mc.ctx));

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rc = gpgme_new(&(mc->ctx));

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

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gpgme_strerror(rc));

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fprintf_plus(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

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gpgme_strerror(rc));

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return false;

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}

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*/

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

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size_t crypto_size,

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char **plaintext){

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char **plaintext,

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mandos_context *mc){

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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ssize_t ret;

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ssize_t plaintext_length = 0;

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if(debug){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"Trying to decrypt OpenPGP data\n");

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fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

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}

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/* Create new GPGME data buffer from memory cryptotext */

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

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0);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_data_new_from_mem: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

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}

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/* Create new empty GPGME data buffer for the plaintext */

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rc = gpgme_data_new(&dh_plain);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "Mandos plugin mandos-client: "

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"bad gpgme_data_new: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf_plus(stderr, "Mandos plugin mandos-client: "

372

"bad gpgme_data_new: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_data_release(dh_crypto);

366

375

return -1;

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}

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/* Decrypt data from the cryptotext data buffer to the plaintext

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data buffer */

371

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

380

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

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if(rc != GPG_ERR_NO_ERROR){

373

fprintf(stderr, "Mandos plugin mandos-client: "

374

"bad gpgme_op_decrypt: %s: %s\n",

375

gpgme_strsource(rc), gpgme_strerror(rc));

382

fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",

383

gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

377

385

if(debug){

378

386

gpgme_decrypt_result_t result;

379

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

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388

if(result == NULL){

381

fprintf(stderr, "Mandos plugin mandos-client: "

382

"gpgme_op_decrypt_result failed\n");

389

fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");

383

390

} else {

384

fprintf(stderr, "Mandos plugin mandos-client: "

385

"Unsupported algorithm: %s\n",

386

result->unsupported_algorithm);

387

fprintf(stderr, "Mandos plugin mandos-client: "

388

"Wrong key usage: %u\n",

389

result->wrong_key_usage);

391

fprintf_plus(stderr, "Unsupported algorithm: %s\n",

392

result->unsupported_algorithm);

393

fprintf_plus(stderr, "Wrong key usage: %u\n",

394

result->wrong_key_usage);

390

395

if(result->file_name != NULL){

391

fprintf(stderr, "Mandos plugin mandos-client: "

392

"File name: %s\n", result->file_name);

396

fprintf_plus(stderr, "File name: %s\n", result->file_name);

393

397

}

394

398

gpgme_recipient_t recipient;

395

399

recipient = result->recipients;

396

400

while(recipient != NULL){

397

fprintf(stderr, "Mandos plugin mandos-client: "

398

"Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

fprintf(stderr, "Mandos plugin mandos-client: "

401

"Key ID: %s\n", recipient->keyid);

402

fprintf(stderr, "Mandos plugin mandos-client: "

403

"Secret key available: %s\n",

404

recipient->status == GPG_ERR_NO_SECKEY

405

? "No" : "Yes");

401

fprintf_plus(stderr, "Public key algorithm: %s\n",

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);

405

fprintf_plus(stderr, "Secret key available: %s\n",

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

406

408

recipient = recipient->next;

407

409

}

408

410

}

411

413

}

412

414

413

415

if(debug){

414

fprintf(stderr, "Mandos plugin mandos-client: "

415

"Decryption of OpenPGP data succeeded\n");

416

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

416

417

}

417

418

419

/* Seek back to the beginning of the GPGME plaintext data buffer */

425

426

*plaintext = NULL;

426

427

while(true){

427

428

plaintext_capacity = incbuffer(plaintext,

428

(size_t)plaintext_length,

429

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

430

431

if(plaintext_capacity == 0){

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

434

435

}

435

436

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

449

450

}

450

451

452

if(debug){

452

fprintf(stderr, "Mandos plugin mandos-client: "

453

"Decrypted password is: ");

453

fprintf_plus(stderr, "Decrypted password is: ");

454

for(ssize_t i = 0; i < plaintext_length; i++){

455

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

456

}

468

}

469

470

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value); /* Spurious warning from

472

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

473

472

if(ret == NULL)

474

473

ret = "(unknown)";

475

474

return ret;

478

477

/* GnuTLS log function callback */

479

478

static void debuggnutls(__attribute__((unused)) int level,

480

479

const char* string){

481

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

480

fprintf_plus(stderr, "GnuTLS: %s", string);

482

481

}

483

482

484

483

static int init_gnutls_global(const char *pubkeyfilename,

485

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

486

int ret;

487

488

if(debug){

489

fprintf(stderr, "Mandos plugin mandos-client: "

490

"Initializing GnuTLS\n");

489

fprintf_plus(stderr, "Initializing GnuTLS\n");

491

490

}

492

491

493

492

ret = gnutls_global_init();

494

493

if(ret != GNUTLS_E_SUCCESS){

495

fprintf(stderr, "Mandos plugin mandos-client: "

496

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

494

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

495

safer_gnutls_strerror(ret));

497

496

return -1;

498

497

}

499

498

506

505

}

507

506

508

507

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

509

if(ret != GNUTLS_E_SUCCESS){

511

fprintf(stderr, "Mandos plugin mandos-client: "

512

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

510

fprintf_plus(stderr, "GnuTLS memory error: %s\n",

511

safer_gnutls_strerror(ret));

513

512

gnutls_global_deinit();

514

513

return -1;

515

514

}

516

515

517

516

if(debug){

518

fprintf(stderr, "Mandos plugin mandos-client: "

519

"Attempting to use OpenPGP public key %s and"

520

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

521

seckeyfilename);

517

fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"

518

" secret key %s as GnuTLS credentials\n",

519

pubkeyfilename,

520

seckeyfilename);

522

521

}

523

522

524

523

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

526

525

GNUTLS_OPENPGP_FMT_BASE64);

527

526

if(ret != GNUTLS_E_SUCCESS){

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

"Error[%d] while reading the OpenPGP key pair ('%s',"

531

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

532

fprintf(stderr, "Mandos plugin mandos-client: "

533

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

527

fprintf_plus(stderr,

528

"Error[%d] while reading the OpenPGP key pair ('%s',"

529

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

530

fprintf_plus(stderr, "The GnuTLS error is: %s\n",

531

safer_gnutls_strerror(ret));

534

532

goto globalfail;

535

533

}

536

534

537

535

/* GnuTLS server initialization */

538

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

539

537

if(ret != GNUTLS_E_SUCCESS){

540

fprintf(stderr, "Mandos plugin mandos-client: "

541

"Error in GnuTLS DH parameter initialization:"

542

" %s\n", safer_gnutls_strerror(ret));

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

543

541

goto globalfail;

544

542

}

545

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

543

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

546

544

if(ret != GNUTLS_E_SUCCESS){

547

fprintf(stderr, "Mandos plugin mandos-client: "

548

"Error in GnuTLS prime generation: %s\n",

549

safer_gnutls_strerror(ret));

545

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

546

safer_gnutls_strerror(ret));

550

547

goto globalfail;

551

548

}

552

549

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

554

551

555

552

return 0;

556

553

557

554

globalfail:

558

555

559

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

560

557

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

562

559

return -1;

563

560

}

564

561

565

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

566

564

int ret;

567

565

/* GnuTLS session creation */

568

566

do {

572

570

}

573

571

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

574

572

if(ret != GNUTLS_E_SUCCESS){

575

fprintf(stderr, "Mandos plugin mandos-client: "

576

"Error in GnuTLS session initialization: %s\n",

577

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

"Error in GnuTLS session initialization: %s\n",

575

safer_gnutls_strerror(ret));

578

576

}

579

577

580

578

{

581

579

const char *err;

582

580

do {

583

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

581

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

584

582

if(quit_now){

585

583

gnutls_deinit(*session);

586

584

return -1;

587

585

}

588

586

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

589

587

if(ret != GNUTLS_E_SUCCESS){

590

fprintf(stderr, "Mandos plugin mandos-client: "

591

"Syntax error at: %s\n", err);

592

fprintf(stderr, "Mandos plugin mandos-client: "

593

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

588

fprintf_plus(stderr, "Syntax error at: %s\n", err);

589

fprintf_plus(stderr, "GnuTLS error: %s\n",

590

safer_gnutls_strerror(ret));

594

591

gnutls_deinit(*session);

595

592

return -1;

596

593

}

598

595

599

596

do {

600

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

601

mc.cred);

598

mc->cred);

602

599

if(quit_now){

603

600

gnutls_deinit(*session);

604

601

return -1;

605

602

}

606

603

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

607

604

if(ret != GNUTLS_E_SUCCESS){

608

fprintf(stderr, "Mandos plugin mandos-client: "

609

"Error setting GnuTLS credentials: %s\n",

610

safer_gnutls_strerror(ret));

605

fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",

606

safer_gnutls_strerror(ret));

611

607

gnutls_deinit(*session);

612

608

return -1;

613

609

}

615

611

/* ignore client certificate if any. */

616

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

617

613

618

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

619

615

620

616

return 0;

621

617

}

625

621

__attribute__((unused)) const char *txt){}

626

622

627

623

/* Called when a Mandos server is found */

628

static int start_mandos_communication(const char *ip, uint16_t port,

624

static int start_mandos_communication(const char *ip, in_port_t port,

629

625

AvahiIfIndex if_index,

630

int af){

626

int af, mandos_context *mc){

631

627

int ret, tcp_sd = -1;

632

628

ssize_t sret;

633

629

union {

658

654

pf = PF_INET;

659

655

break;

660

656

default:

661

fprintf(stderr, "Mandos plugin mandos-client: "

662

"Bad address family: %d\n", af);

657

fprintf_plus(stderr, "Bad address family: %d\n", af);

663

658

errno = EINVAL;

664

659

return -1;

665

660

}

666

661

667

ret = init_gnutls_session(&session);

662

/* If the interface is specified and we have a list of interfaces */

663

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

664

/* Check if the interface is one of the interfaces we are using */

665

bool match = false;

666

{

667

char *interface = NULL;

668

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

669

interface))){

670

if(if_nametoindex(interface) == (unsigned int)if_index){

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

/* This interface does not match any in the list, so we don't

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

if(if_indextoname((unsigned int)if_index, interface) == NULL){

682

perror_plus("if_indextoname");

683

} else {

684

fprintf_plus(stderr, "Skipping server on non-used interface"

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

668

695

if(ret != 0){

669

696

return -1;

670

697

}

671

698

672

699

if(debug){

673

fprintf(stderr, "Mandos plugin mandos-client: "

674

"Setting up a TCP connection to %s, port %" PRIu16

675

"\n", ip, port);

700

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

701

PRIuMAX "\n", ip, (uintmax_t)port);

676

702

}

677

703

678

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

704

730

}

705

731

if(ret == 0){

706

732

int e = errno;

707

fprintf(stderr, "Mandos plugin mandos-client: "

708

"Bad address: %s\n", ip);

733

fprintf_plus(stderr, "Bad address: %s\n", ip);

709

734

errno = e;

710

735

goto mandos_end;

711

736

}

712

737

if(af == AF_INET6){

713

to.in6.sin6_port = htons(port); /* Spurious warnings from

714

-Wconversion and

715

-Wunreachable-code */

716

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

717

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

719

-Wunreachable-code*/

744

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

720

748

if(if_index == AVAHI_IF_UNSPEC){

721

fprintf(stderr, "Mandos plugin mandos-client: "

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

749

fprintf_plus(stderr, "An IPv6 link-local address is"

750

" incomplete without a network interface\n");

724

751

errno = EINVAL;

725

752

goto mandos_end;

726

753

}

728

755

to.in6.sin6_scope_id = (uint32_t)if_index;

729

756

}

730

757

} else {

731

to.in.sin_port = htons(port); /* Spurious warnings from

732

-Wconversion and

733

-Wunreachable-code */

758

to.in.sin_port = htons(port);

734

759

}

735

760

736

761

if(quit_now){

744

769

if(if_indextoname((unsigned int)if_index, interface) == NULL){

745

770

perror_plus("if_indextoname");

746

771

} else {

747

fprintf(stderr, "Mandos plugin mandos-client: "

748

"Connection to: %s%%%s, port %" PRIu16 "\n",

749

ip, interface, port);

772

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

773

"\n", ip, interface, (uintmax_t)port);

750

774

}

751

775

} else {

752

fprintf(stderr, "Mandos plugin mandos-client: "

753

"Connection to: %s, port %" PRIu16 "\n", ip, port);

776

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

777

ip, (uintmax_t)port);

754

778

}

755

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

766

790

perror_plus("inet_ntop");

767

791

} else {

768

792

if(strcmp(addrstr, ip) != 0){

769

fprintf(stderr, "Mandos plugin mandos-client: "

770

"Canonical address form: %s\n", addrstr);

793

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

771

794

}

772

795

}

773

796

}

801

824

while(true){

802

825

size_t out_size = strlen(out);

803

826

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

804

out_size - written));

827

out_size - written));

805

828

if(ret == -1){

806

829

int e = errno;

807

830

perror_plus("write");

827

850

}

828

851

829

852

if(debug){

830

fprintf(stderr, "Mandos plugin mandos-client: "

831

"Establishing TLS session with %s\n", ip);

853

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

832

854

}

833

855

834

856

if(quit_now){

836

858

goto mandos_end;

837

859

}

838

860

839

/* Spurious warning from -Wint-to-pointer-cast */

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

861

/* This casting via intptr_t is to eliminate warning about casting

862

an int to a pointer type. This is exactly how the GnuTLS Guile

863

function "set-session-transport-fd!" does it. */

864

gnutls_transport_set_ptr(session,

865

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

841

866

842

867

if(quit_now){

843

868

errno = EINTR;

854

879

855

880

if(ret != GNUTLS_E_SUCCESS){

856

881

if(debug){

857

fprintf(stderr, "Mandos plugin mandos-client: "

858

"*** GnuTLS Handshake failed ***\n");

882

fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");

859

883

gnutls_perror(ret);

860

884

}

861

885

errno = EPROTO;

865

889

/* Read OpenPGP packet that contains the wanted password */

866

890

867

891

if(debug){

868

fprintf(stderr, "Mandos plugin mandos-client: "

869

"Retrieving OpenPGP encrypted password from %s\n", ip);

892

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

893

" %s\n", ip);

870

894

}

871

895

872

896

while(true){

877

901

}

878

902

879

903

buffer_capacity = incbuffer(&buffer, buffer_length,

880

buffer_capacity);

904

buffer_capacity);

881

905

if(buffer_capacity == 0){

882

906

int e = errno;

883

907

perror_plus("incbuffer");

910

934

}

911

935

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

912

936

if(ret < 0){

913

fprintf(stderr, "Mandos plugin mandos-client: "

914

"*** GnuTLS Re-handshake failed ***\n");

937

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

938

"***\n");

915

939

gnutls_perror(ret);

916

940

errno = EPROTO;

917

941

goto mandos_end;

918

942

}

919

943

break;

920

944

default:

921

fprintf(stderr, "Mandos plugin mandos-client: "

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

945

fprintf_plus(stderr, "Unknown error while reading data from"

946

" encrypted session with Mandos server\n");

924

947

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

948

errno = EIO;

926

949

goto mandos_end;

931

954

}

932

955

933

956

if(debug){

934

fprintf(stderr, "Mandos plugin mandos-client: "

935

"Closing TLS session\n");

957

fprintf_plus(stderr, "Closing TLS session\n");

936

958

}

937

959

938

960

if(quit_now){

950

972

951

973

if(buffer_length > 0){

952

974

ssize_t decrypted_buffer_size;

953

decrypted_buffer_size = pgp_packet_decrypt(buffer,

954

buffer_length,

955

&decrypted_buffer);

975

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

976

&decrypted_buffer, mc);

956

977

if(decrypted_buffer_size >= 0){

957

978

958

979

written = 0;

968

989

if(ret == 0 and ferror(stdout)){

969

990

int e = errno;

970

991

if(debug){

971

fprintf(stderr, "Mandos plugin mandos-client: "

972

"Error writing encrypted data: %s\n",

973

strerror(errno));

992

fprintf_plus(stderr, "Error writing encrypted data: %s\n",

993

strerror(errno));

974

994

}

975

995

errno = e;

976

996

goto mandos_end;

1020

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1021

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1022

1042

flags,

1023

AVAHI_GCC_UNUSED void* userdata){

1024

assert(r);

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1025

1047

1026

1048

/* Called whenever a service has been resolved successfully or

1027

1049

timed out */

1033

1055

switch(event){

1034

1056

default:

1035

1057

case AVAHI_RESOLVER_FAILURE:

1036

fprintf(stderr, "Mandos plugin mandos-client: "

1037

"(Avahi Resolver) Failed to resolve service '%s'"

1038

" of type '%s' in domain '%s': %s\n", name, type, domain,

1039

avahi_strerror(avahi_server_errno(mc.server)));

1058

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1059

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1060

domain,

1061

avahi_strerror(avahi_server_errno

1062

(((mandos_context*)mc)->server)));

1040

1063

break;

1041

1064

1042

1065

case AVAHI_RESOLVER_FOUND:

1044

1067

char ip[AVAHI_ADDRESS_STR_MAX];

1045

1068

avahi_address_snprint(ip, sizeof(ip), address);

1046

1069

if(debug){

1047

fprintf(stderr, "Mandos plugin mandos-client: "

1048

"Mandos server \"%s\" found on %s (%s, %"

1049

PRIdMAX ") on port %" PRIu16 "\n", name, host_name,

1050

ip, (intmax_t)interface, port);

1070

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1071

PRIdMAX ") on port %" PRIu16 "\n", name,

1072

host_name, ip, (intmax_t)interface, port);

1051

1073

}

1052

int ret = start_mandos_communication(ip, port, interface,

1053

avahi_proto_to_af(proto));

1074

int ret = start_mandos_communication(ip, (in_port_t)port,

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1054

1078

if(ret == 0){

1055

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1056

1080

} else {

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

1081

if(not add_server(ip, (in_port_t)port, interface,

1082

avahi_proto_to_af(proto),

1083

&((mandos_context*)mc)->current_server)){

1084

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1085

" list\n", name);

1086

}

1059

1087

}

1060

1088

}

1061

1089

}

1071

1099

const char *domain,

1072

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1073

1101

flags,

1074

AVAHI_GCC_UNUSED void* userdata){

1075

assert(b);

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1076

1106

1077

1107

/* Called whenever a new services becomes available on the LAN or

1078

1108

is removed from the LAN */

1085

1115

default:

1086

1116

case AVAHI_BROWSER_FAILURE:

1087

1117

1088

fprintf(stderr, "Mandos plugin mandos-client: "

1089

"(Avahi browser) %s\n",

1090

avahi_strerror(avahi_server_errno(mc.server)));

1091

avahi_simple_poll_quit(mc.simple_poll);

1118

fprintf_plus(stderr, "(Avahi browser) %s\n",

1119

avahi_strerror(avahi_server_errno

1120

(((mandos_context*)mc)->server)));

1121

avahi_simple_poll_quit(simple_poll);

1092

1122

return;

1093

1123

1094

1124

case AVAHI_BROWSER_NEW:

1097

1127

the callback function is called the Avahi server will free the

1098

1128

resolver for us. */

1099

1129

1100

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1101

name, type, domain, protocol, 0,

1102

resolve_callback, NULL) == NULL)

1103

fprintf(stderr, "Mandos plugin mandos-client: "

1104

"Avahi: Failed to resolve service '%s': %s\n",

1105

name, avahi_strerror(avahi_server_errno(mc.server)));

1130

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1131

interface, protocol, name, type,

1132

domain, protocol, 0,

1133

resolve_callback, mc) == NULL)

1134

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1135

" %s\n", name,

1136

avahi_strerror(avahi_server_errno

1137

(((mandos_context*)mc)->server)));

1106

1138

break;

1107

1139

1108

1140

case AVAHI_BROWSER_REMOVE:

1111

1143

case AVAHI_BROWSER_ALL_FOR_NOW:

1112

1144

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1113

1145

if(debug){

1114

fprintf(stderr, "Mandos plugin mandos-client: "

1115

"No Mandos server found, still searching...\n");

1146

fprintf_plus(stderr, "No Mandos server found, still"

1147

" searching...\n");

1116

1148

}

1117

1149

break;

1118

1150

}

1127

1159

signal_received = sig;

1128

1160

int old_errno = errno;

1129

1161

/* set main loop to exit */

1130

if(mc.simple_poll != NULL){

1131

avahi_simple_poll_quit(mc.simple_poll);

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1132

1164

}

1133

1165

errno = old_errno;

1134

1166

}

1135

1167

1136

1168

bool get_flags(const char *ifname, struct ifreq *ifr){

1137

1169

int ret;

1170

error_t ret_errno;

1138

1171

1139

1172

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1140

1173

if(s < 0){

1174

ret_errno = errno;

1141

1175

perror_plus("socket");

1176

errno = ret_errno;

1142

1177

return false;

1143

1178

}

1144

1179

strcpy(ifr->ifr_name, ifname);

1145

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1146

1181

if(ret == -1){

1147

1182

if(debug){

1183

ret_errno = errno;

1148

1184

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1149

1186

}

1150

1187

return false;

1151

1188

}

1157

1194

/* Reject the loopback device */

1158

1195

if(ifr->ifr_flags & IFF_LOOPBACK){

1159

1196

if(debug){

1160

fprintf(stderr, "Mandos plugin mandos-client: "

1161

"Rejecting loopback interface \"%s\"\n", ifname);

1197

fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",

1198

ifname);

1162

1199

}

1163

1200

return false;

1164

1201

}

1165

1202

/* Accept point-to-point devices only if connect_to is specified */

1166

1203

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1167

1204

if(debug){

1168

fprintf(stderr, "Mandos plugin mandos-client: "

1169

"Accepting point-to-point interface \"%s\"\n", ifname);

1205

fprintf_plus(stderr, "Accepting point-to-point interface"

1206

" \"%s\"\n", ifname);

1170

1207

}

1171

1208

return true;

1172

1209

}

1173

1210

/* Otherwise, reject non-broadcast-capable devices */

1174

1211

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1175

1212

if(debug){

1176

fprintf(stderr, "Mandos plugin mandos-client: "

1177

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1213

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1214

" \"%s\"\n", ifname);

1178

1215

}

1179

1216

return false;

1180

1217

}

1181

1218

/* Reject non-ARP interfaces (including dummy interfaces) */

1182

1219

if(ifr->ifr_flags & IFF_NOARP){

1183

1220

if(debug){

1184

fprintf(stderr, "Mandos plugin mandos-client: "

1185

"Rejecting non-ARP interface \"%s\"\n", ifname);

1221

fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",

1222

ifname);

1186

1223

}

1187

1224

return false;

1188

1225

}

1189

1226

1190

1227

/* Accept this device */

1191

1228

if(debug){

1192

fprintf(stderr, "Mandos plugin mandos-client: "

1193

"Interface \"%s\" is good\n", ifname);

1229

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1194

1230

}

1195

1231

return true;

1196

1232

}

1208

1244

struct ifreq ifr;

1209

1245

if(not get_flags(if_entry->d_name, &ifr)){

1210

1246

if(debug){

1211

fprintf(stderr, "Mandos plugin mandos-client: "

1212

"Failed to get flags for interface \"%s\"\n",

1213

if_entry->d_name);

1214

}

1215

return 0;

1216

}

1217

1218

if(not good_flags(if_entry->d_name, &ifr)){

1219

return 0;

1220

}

1221

return 1;

1222

}

1223

1224

/*

1225

* This function determines if a directory entry in /sys/class/net

1226

* corresponds to an acceptable network device which is up.

1227

* (This function is passed to scandir(3) as a filter function.)

1228

*/

1229

int up_interface(const struct dirent *if_entry){

1230

if(if_entry->d_name[0] == '.'){

1231

return 0;

1232

}

1233

1234

struct ifreq ifr;

1235

if(not get_flags(if_entry->d_name, &ifr)){

1236

if(debug){

1237

fprintf(stderr, "Mandos plugin mandos-client: "

1238

"Failed to get flags for interface \"%s\"\n",

1239

if_entry->d_name);

1240

}

1241

return 0;

1242

}

1243

1244

/* Reject down interfaces */

1245

if(not (ifr.ifr_flags & IFF_UP)){

1246

if(debug){

1247

fprintf(stderr, "Mandos plugin mandos-client: "

1248

"Rejecting down interface \"%s\"\n",

1249

if_entry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

/* Reject non-running interfaces */

1255

if(not (ifr.ifr_flags & IFF_RUNNING)){

1256

if(debug){

1257

fprintf(stderr, "Mandos plugin mandos-client: "

1258

"Rejecting non-running interface \"%s\"\n",

1259

if_entry->d_name);

1260

}

1261

return 0;

1262

}

1263

1264

if(not good_flags(if_entry->d_name, &ifr)){

1265

return 0;

1266

}

1267

return 1;

1247

fprintf_plus(stderr, "Failed to get flags for interface "

1248

"\"%s\"\n", if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

if(not good_flags(if_entry->d_name, &ifr)){

1254

return 0;

1255

}

1256

return 1;

1257

}

1258

1259

/*

1260

* This function determines if a network interface is up.

1261

*/

1262

bool interface_is_up(const char *interface){

1263

struct ifreq ifr;

1264

if(not get_flags(interface, &ifr)){

1265

if(debug){

1266

fprintf_plus(stderr, "Failed to get flags for interface "

1267

"\"%s\"\n", interface);

1268

}

1269

return false;

1270

}

1271

1272

return (bool)(ifr.ifr_flags & IFF_UP);

1273

}

1274

1275

/*

1276

* This function determines if a network interface is running

1277

*/

1278

bool interface_is_running(const char *interface){

1279

struct ifreq ifr;

1280

if(not get_flags(interface, &ifr)){

1281

if(debug){

1282

fprintf_plus(stderr, "Failed to get flags for interface "

1283

"\"%s\"\n", interface);

1284

}

1285

return false;

1286

}

1287

1288

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1268

1289

}

1269

1290

1270

1291

int notdotentries(const struct dirent *direntry){

1281

1302

/* Is this directory entry a runnable program? */

1282

1303

int runnable_hook(const struct dirent *direntry){

1283

1304

int ret;

1305

size_t sret;

1284

1306

struct stat st;

1285

1307

1286

1308

if((direntry->d_name)[0] == '\0'){

1288

1310

return 0;

1289

1311

}

1290

1312

1291

/* Save pointer to last character */

1292

char *end = strchr(direntry->d_name, '\0')-1;

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

if(((direntry->d_name)[0] == '#')

1300

and (*end == '#')){

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

ret = stat(direntry->d_name, &st);

1313

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1314

"abcdefghijklmnopqrstuvwxyz"

1315

"0123456789"

1316

"_-");

1317

if((direntry->d_name)[sret] != '\0'){

1318

/* Contains non-allowed characters */

1319

if(debug){

1320

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1321

direntry->d_name);

1322

}

1323

return 0;

1324

}

1325

1326

char *fullname = NULL;

1327

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1328

if(ret < 0){

1329

perror_plus("asprintf");

1330

return 0;

1331

}

1332

1333

ret = stat(fullname, &st);

1308

1334

if(ret == -1){

1309

1335

if(debug){

1310

perror_plus("Could not stat plugin");

1336

perror_plus("Could not stat hook");

1311

1337

}

1312

1338

return 0;

1313

1339

}

1314

1340

if(not (S_ISREG(st.st_mode))){

1315

1341

/* Not a regular file */

1342

if(debug){

1343

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1344

direntry->d_name);

1345

}

1316

1346

return 0;

1317

1347

}

1318

1348

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1319

1349

/* Not executable */

1350

if(debug){

1351

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1352

direntry->d_name);

1353

}

1320

1354

return 0;

1321

1355

}

1356

if(debug){

1357

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1358

direntry->d_name);

1359

}

1322

1360

return 1;

1323

1361

}

1324

1362

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1326

1365

int ret;

1327

1366

struct timespec now;

1328

1367

struct timespec waited_time;

1329

1368

intmax_t block_time;

1330

1369

1331

1370

while(true){

1332

if(mc.current_server == NULL){

1371

if(mc->current_server == NULL){

1333

1372

if (debug){

1334

fprintf(stderr, "Mandos plugin mandos-client: "

1335

"Wait until first server is found. No timeout!\n");

1373

fprintf_plus(stderr, "Wait until first server is found."

1374

" No timeout!\n");

1336

1375

}

1337

1376

ret = avahi_simple_poll_iterate(s, -1);

1338

1377

} else {

1339

1378

if (debug){

1340

fprintf(stderr, "Mandos plugin mandos-client: "

1341

"Check current_server if we should run it,"

1342

" or wait\n");

1379

fprintf_plus(stderr, "Check current_server if we should run"

1380

" it, or wait\n");

1343

1381

}

1344

1382

/* the current time */

1345

1383

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1350

1388

/* Calculating in ms how long time between now and server

1351

1389

who we visted longest time ago. Now - last seen. */

1352

1390

waited_time.tv_sec = (now.tv_sec

1353

- mc.current_server->last_seen.tv_sec);

1391

- mc->current_server->last_seen.tv_sec);

1354

1392

waited_time.tv_nsec = (now.tv_nsec

1355

- mc.current_server->last_seen.tv_nsec);

1393

- mc->current_server->last_seen.tv_nsec);

1356

1394

/* total time is 10s/10,000ms.

1357

1395

Converting to s from ms by dividing by 1,000,

1358

1396

and ns to ms by dividing by 1,000,000. */

1361

1399

- ((intmax_t)waited_time.tv_nsec / 1000000));

1362

1400

1363

1401

if (debug){

1364

fprintf(stderr, "Mandos plugin mandos-client: "

1365

"Blocking for %" PRIdMAX " ms\n", block_time);

1402

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1403

block_time);

1366

1404

}

1367

1405

1368

1406

if(block_time <= 0){

1369

ret = start_mandos_communication(mc.current_server->ip,

1370

mc.current_server->port,

1371

mc.current_server->if_index,

1372

mc.current_server->af);

1407

ret = start_mandos_communication(mc->current_server->ip,

1408

mc->current_server->port,

1409

mc->current_server->if_index,

1410

mc->current_server->af, mc);

1373

1411

if(ret == 0){

1374

avahi_simple_poll_quit(mc.simple_poll);

1412

avahi_simple_poll_quit(s);

1375

1413

return 0;

1376

1414

}

1377

1415

ret = clock_gettime(CLOCK_MONOTONIC,

1378

&mc.current_server->last_seen);

1416

&mc->current_server->last_seen);

1379

1417

if(ret == -1){

1380

1418

perror_plus("clock_gettime");

1381

1419

return -1;

1382

1420

}

1383

mc.current_server = mc.current_server->next;

1421

mc->current_server = mc->current_server->next;

1384

1422

block_time = 0; /* Call avahi to find new Mandos

1385

1423

servers, but don't block */

1386

1424

}

1395

1433

}

1396

1434

}

1397

1435

1436

/* Set effective uid to 0, return errno */

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

if(seteuid(0) == -1){

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

/* Set effective and real user ID to 0. Return errno. */

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

if(setuid(0) == -1){

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

/* Set effective user ID to unprivileged saved user ID */

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

if(seteuid(uid) == -1){

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

if(setuid(uid) == -1){

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

bool run_network_hooks(const char *mode, const char *interface,

1489

const float delay){

1490

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1493

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1494

alphasort);

1495

if(numhooks == -1){

1496

if(errno == ENOENT){

1497

if(debug){

1498

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1504

} else {

1505

int devnull = open("/dev/null", O_RDONLY);

1506

for(int i = 0; i < numhooks; i++){

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1510

if(ret < 0){

1511

perror_plus("asprintf");

1512

continue;

1513

}

1514

if(debug){

1515

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

ret = setenv("DEVICE", interface, 1);

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

ret = setenv("MODE", mode, 1);

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

ret = asprintf(&delaystring, "%f", delay);

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

ret = setenv("DELAY", delaystring, 1);

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1570

free(delaystring);

1571

if(connect_to != NULL){

1572

ret = setenv("CONNECT", connect_to, 1);

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

1582

} else {

1583

int status;

1584

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1592

" with status %d\n", direntry->d_name,

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1599

" signal %d\n", direntry->d_name,

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

fprintf_plus(stderr, "Warning: network hook \"%s\""

1605

" crashed\n", direntry->d_name);

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

return true;

1619

}

1620

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1627

struct ifreq network;

1628

unsigned int if_index = if_nametoindex(interface);

1629

if(if_index == 0){

1630

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1631

errno = old_errno;

1632

return ENXIO;

1633

}

1634

1635

if(quit_now){

1636

errno = old_errno;

1637

return EINTR;

1638

}

1639

1640

if(not interface_is_up(interface)){

1641

if(not get_flags(interface, &network) and debug){

1642

ret_errno = errno;

1643

fprintf_plus(stderr, "Failed to get flags for interface "

1644

"\"%s\"\n", interface);

1645

return ret_errno;

1646

}

1647

network.ifr_flags |= IFF_UP;

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

ret_errno = errno;

1652

perror_plus("socket");

1653

errno = old_errno;

1654

return ret_errno;

1655

}

1656

1657

if(quit_now){

1658

close(sd);

1659

errno = old_errno;

1660

return EINTR;

1661

}

1662

1663

if(debug){

1664

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1665

interface);

1666

}

1667

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1671

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

messages about the network interface to mess up the prompt */

1674

int ret_linux = klogctl(8, NULL, 5);

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1679

}

1680

#endif /* __linux__ */

1681

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1682

ret_errno = errno;

1683

#ifdef __linux__

1684

if(restore_loglevel){

1685

ret_linux = klogctl(7, NULL, 0);

1686

if(ret_linux == -1){

1687

perror_plus("klogctl");

1688

}

1689

}

1690

#endif /* __linux__ */

1691

1692

/* Lower privileges */

1693

lower_privileges();

1694

1695

/* Close the socket */

1696

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1697

if(ret == -1){

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

} else if(debug){

1708

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1709

interface);

1710

}

1711

1712

/* Sleep checking until interface is running.

1713

Check every 0.25s, up to total time of delay */

1714

for(int i=0; i < delay * 4; i++){

1715

if(interface_is_running(interface)){

1716

break;

1717

}

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1719

ret = nanosleep(&sleeptime, NULL);

1720

if(ret == -1 and errno != EINTR){

1721

perror_plus("nanosleep");

1722

}

1723

}

1724

1725

errno = old_errno;

1726

return 0;

1727

}

1728

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

if(not get_flags(interface, &network) and debug){

1743

ret_errno = errno;

1744

fprintf_plus(stderr, "Failed to get flags for interface "

1745

"\"%s\"\n", interface);

1746

return ret_errno;

1747

}

1748

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1749

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1752

ret_errno = errno;

1753

perror_plus("socket");

1754

errno = old_errno;

1755

return ret_errno;

1756

}

1757

1758

if(debug){

1759

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

1760

interface);

1761

}

1762

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1771

1772

/* Close the socket */

1773

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ret_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

errno = old_errno;

1782

return ret_errno;

1783

}

1784

} else if(debug){

1785

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1786

interface);

1787

}

1788

1789

errno = old_errno;

1790

return 0;

1791

}

1792

1398

1793

int main(int argc, char *argv[]){

1794

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1795

.priority = "SECURE256:!CTYPE-X.509:"

1796

"+CTYPE-OPENPGP", .current_server = NULL,

1797

.interfaces = NULL, .interfaces_size = 0 };

1399

1798

AvahiSServiceBrowser *sb = NULL;

1400

int error;

1799

error_t ret_errno;

1401

1800

int ret;

1402

1801

intmax_t tmpmax;

1403

1802

char *tmp;

1404

1803

int exitcode = EXIT_SUCCESS;

1405

const char *interface = "";

1406

struct ifreq network;

1407

int sd = -1;

1408

bool take_down_interface = false;

1409

uid_t uid;

1410

gid_t gid;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1411

1806

char tempdir[] = "/tmp/mandosXXXXXX";

1412

1807

bool tempdir_created = false;

1413

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1414

1809

const char *seckey = PATHDIR "/" SECKEY;

1415

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1416

1813

1417

1814

bool gnutls_initialized = false;

1418

1815

bool gpgme_initialized = false;

1480

1877

.group = 2 },

1481

1878

{ .name = "retry", .key = 132,

1482

1879

.arg = "SECONDS",

1483

.doc = "Retry interval used when denied by the mandos server",

1880

.doc = "Retry interval used when denied by the Mandos server",

1881

.group = 2 },

1882

{ .name = "network-hook-dir", .key = 133,

1883

.arg = "DIR",

1884

.doc = "Directory where network hooks are located",

1484

1885

.group = 2 },

1485

1886

/*

1486

1887

* These reproduce what we would get without ARGP_NO_HELP

1505

1906

connect_to = arg;

1506

1907

break;

1507

1908

case 'i': /* --interface */

1508

interface = arg;

1909

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

argp_error(state, "%s", strerror(ret_errno));

1913

}

1509

1914

break;

1510

1915

case 's': /* --seckey */

1511

1916

seckey = arg;

1540

1945

argp_error(state, "Bad retry interval");

1541

1946

}

1542

1947

break;

1948

case 133: /* --network-hook-dir */

1949

hookdir = arg;

1950

break;

1543

1951

/*

1544

1952

* These reproduce what we would get without ARGP_NO_HELP

1545

1953

*/

1551

1959

argp_state_help(state, state->out_stream,

1552

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1553

1961

case 'V': /* --version */

1554

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1555

fprintf(state->out_stream, "%s\n", argp_program_version);

1962

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1556

1963

exit(argp_err_exit_status);

1557

1964

break;

1558

1965

default:

1585

1992

{

1586

1993

/* Work around Debian bug #633582:

1587

1994

<http://bugs.debian.org/633582> */

1588

struct stat st;

1589

1995

1590

1996

/* Re-raise priviliges */

1591

errno = 0;

1592

ret = seteuid(0);

1593

if(ret == -1){

1594

perror_plus("seteuid");

1595

}

1596

1597

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1598

int seckey_fd = open(seckey, O_RDONLY);

1599

if(seckey_fd == -1){

1600

perror_plus("open");

1601

} else {

1602

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1603

if(ret == -1){

1604

perror_plus("fstat");

1605

} else {

1606

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1607

ret = fchown(seckey_fd, uid, gid);

1608

if(ret == -1){

1609

perror_plus("fchown");

1610

}

1611

}

1612

}

1613

TEMP_FAILURE_RETRY(close(seckey_fd));

1614

}

1615

}

1616

1617

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1618

int pubkey_fd = open(pubkey, O_RDONLY);

1619

if(pubkey_fd == -1){

1620

perror_plus("open");

1621

} else {

1622

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1623

if(ret == -1){

1624

perror_plus("fstat");

1625

} else {

1626

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1627

ret = fchown(pubkey_fd, uid, gid);

1628

if(ret == -1){

1629

perror_plus("fchown");

1630

}

1631

}

1632

}

1633

TEMP_FAILURE_RETRY(close(pubkey_fd));

1634

}

1635

}

1636

1637

/* Lower privileges */

1638

errno = 0;

1639

ret = seteuid(uid);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

}

1644

1645

/* Find network hooks and run them */

1646

{

1647

struct dirent **direntries;

1648

struct dirent *direntry;

1649

int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,

1650

alphasort);

1651

if(numhooks == -1){

1652

perror_plus("scandir");

1653

} else {

1654

int devnull = open("/dev/null", O_RDONLY);

1655

for(int i = 0; i < numhooks; i++){

1656

direntry = direntries[0];

1657

char *fullname = NULL;

1658

ret = asprintf(&fullname, "%s/%s", tempdir,

1659

direntry->d_name);

1660

if(ret < 0){

1661

perror_plus("asprintf");

1662

continue;

1663

}

1664

pid_t hook_pid = fork();

1665

if(hook_pid == 0){

1666

/* Child */

1667

dup2(devnull, STDIN_FILENO);

1668

close(devnull);

1669

dup2(STDERR_FILENO, STDOUT_FILENO);

1670

ret = setenv("DEVICE", interface, 1);

1671

if(ret == -1){

1672

perror_plus("setenv");

1673

exit(1);

1674

}

1675

ret = setenv("VERBOSE", debug ? "1" : "0", 1);

1676

if(ret == -1){

1677

perror_plus("setenv");

1678

exit(1);

1679

}

1680

ret = setenv("MODE", "start", 1);

1681

if(ret == -1){

1682

perror_plus("setenv");

1683

exit(1);

1684

}

1685

char *delaystring;

1686

ret = asprintf(&delaystring, "%f", delay);

1687

if(ret == -1){

1688

perror_plus("asprintf");

1689

exit(1);

1690

}

1691

ret = setenv("DELAY", delaystring, 1);

1692

if(ret == -1){

1693

free(delaystring);

1694

perror_plus("setenv");

1695

exit(1);

1696

}

1697

free(delaystring);

1698

ret = execl(fullname, direntry->d_name, "start", NULL);

1699

perror_plus("execl");

1700

} else {

1701

int status;

1702

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1703

perror_plus("waitpid");

1704

free(fullname);

1705

continue;

1706

}

1707

if(WIFEXITED(status)){

1708

if(WEXITSTATUS(status) != 0){

1709

fprintf(stderr, "Mandos plugin mandos-client: "

1710

"Warning: network hook \"%s\" exited"

1711

" with status %d\n", direntry->d_name,

1712

WEXITSTATUS(status));

1713

free(fullname);

1714

continue;

1715

}

1716

} else if(WIFSIGNALED(status)){

1717

fprintf(stderr, "Mandos plugin mandos-client: "

1718

"Warning: network hook \"%s\" died by"

1719

" signal %d\n", direntry->d_name,

1720

WTERMSIG(status));

1721

free(fullname);

1722

continue;

1723

} else {

1724

fprintf(stderr, "Mandos plugin mandos-client: "

1725

"Warning: network hook \"%s\" crashed\n",

1726

direntry->d_name);

1727

free(fullname);

1728

continue;

1729

}

1730

}

1731

free(fullname);

1732

if(quit_now){

1733

goto end;

1734

}

1735

}

1736

close(devnull);

1997

if(raise_privileges() == 0){

1998

struct stat st;

1999

2000

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2001

int seckey_fd = open(seckey, O_RDONLY);

2002

if(seckey_fd == -1){

2003

perror_plus("open");

2004

} else {

2005

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

2006

if(ret == -1){

2007

perror_plus("fstat");

2008

} else {

2009

if(S_ISREG(st.st_mode)

2010

and st.st_uid == 0 and st.st_gid == 0){

2011

ret = fchown(seckey_fd, uid, gid);

2012

if(ret == -1){

2013

perror_plus("fchown");

2014

}

2015

}

2016

}

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2018

}

2019

}

2020

2021

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2023

if(pubkey_fd == -1){

2024

perror_plus("open");

2025

} else {

2026

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

2027

if(ret == -1){

2028

perror_plus("fstat");

2029

} else {

2030

if(S_ISREG(st.st_mode)

2031

and st.st_uid == 0 and st.st_gid == 0){

2032

ret = fchown(pubkey_fd, uid, gid);

2033

if(ret == -1){

2034

perror_plus("fchown");

2035

}

2036

}

2037

}

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2042

/* Lower privileges */

2043

lower_privileges();

2044

}

2045

}

2046

2047

/* Remove invalid interface names (except "none") */

2048

{

2049

char *interface = NULL;

2050

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2051

interface))){

2052

if(strcmp(interface, "none") != 0

2053

and if_nametoindex(interface) == 0){

2054

if(interface[0] != '\0'){

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

" \"%s\"\n", interface);

2057

}

2058

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2059

interface = NULL;

2060

}

2061

}

2062

}

2063

2064

/* Run network hooks */

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2078

interfaces_hooks : "", delay)){

2079

goto end;

1737

2080

}

1738

2081

}

1739

2082

1741

2084

avahi_set_log_function(empty_log);

1742

2085

}

1743

2086

1744

if(interface[0] == '\0'){

1745

struct dirent **direntries;

1746

/* First look for interfaces that are up */

1747

ret = scandir(sys_class_net, &direntries, up_interface,

1748

alphasort);

1749

if(ret == 0){

1750

/* No up interfaces, look for any good interfaces */

1751

free(direntries);

1752

ret = scandir(sys_class_net, &direntries, good_interface,

1753

alphasort);

1754

}

1755

if(ret >= 1){

1756

/* Pick the first interface returned */

1757

interface = strdup(direntries[0]->d_name);

1758

if(debug){

1759

fprintf(stderr, "Mandos plugin mandos-client: "

1760

"Using interface \"%s\"\n", interface);

1761

}

1762

if(interface == NULL){

1763

perror_plus("malloc");

1764

free(direntries);

1765

exitcode = EXIT_FAILURE;

1766

goto end;

1767

}

1768

free(direntries);

1769

} else {

1770

free(direntries);

1771

fprintf(stderr, "Mandos plugin mandos-client: "

1772

"Could not find a network interface\n");

1773

exitcode = EXIT_FAILURE;

1774

goto end;

1775

}

1776

}

1777

1778

2087

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1779

2088

from the signal handler */

1780

2089

/* Initialize the pseudo-RNG for Avahi */

1781

2090

srand((unsigned int) time(NULL));

1782

mc.simple_poll = avahi_simple_poll_new();

1783

if(mc.simple_poll == NULL){

1784

fprintf(stderr, "Mandos plugin mandos-client: "

1785

"Avahi: Failed to create simple poll object.\n");

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

2093

fprintf_plus(stderr,

2094

"Avahi: Failed to create simple poll object.\n");

1786

2095

exitcode = EX_UNAVAILABLE;

1787

2096

goto end;

1788

2097

}

1850

2159

}

1851

2160

}

1852

2161

1853

/* If the interface is down, bring it up */

1854

if(strcmp(interface, "none") != 0){

1855

if_index = (AvahiIfIndex) if_nametoindex(interface);

1856

if(if_index == 0){

1857

fprintf(stderr, "Mandos plugin mandos-client: "

1858

"No such interface: \"%s\"\n", interface);

1859

exitcode = EX_UNAVAILABLE;

1860

goto end;

1861

}

1862

1863

if(quit_now){

1864

goto end;

1865

}

1866

1867

/* Re-raise priviliges */

1868

errno = 0;

1869

ret = seteuid(0);

1870

if(ret == -1){

1871

perror_plus("seteuid");

1872

}

1873

1874

#ifdef __linux__

1875

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1876

messages about the network interface to mess up the prompt */

1877

ret = klogctl(8, NULL, 5);

1878

bool restore_loglevel = true;

1879

if(ret == -1){

1880

restore_loglevel = false;

1881

perror_plus("klogctl");

1882

}

1883

#endif /* __linux__ */

1884

1885

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1886

if(sd < 0){

1887

perror_plus("socket");

1888

exitcode = EX_OSERR;

1889

#ifdef __linux__

1890

if(restore_loglevel){

1891

ret = klogctl(7, NULL, 0);

1892

if(ret == -1){

1893

perror_plus("klogctl");

1894

}

1895

}

1896

#endif /* __linux__ */

1897

/* Lower privileges */

1898

errno = 0;

1899

ret = seteuid(uid);

1900

if(ret == -1){

1901

perror_plus("seteuid");

1902

}

1903

goto end;

1904

}

1905

strcpy(network.ifr_name, interface);

1906

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1907

if(ret == -1){

1908

perror_plus("ioctl SIOCGIFFLAGS");

1909

#ifdef __linux__

1910

if(restore_loglevel){

1911

ret = klogctl(7, NULL, 0);

1912

if(ret == -1){

1913

perror_plus("klogctl");

1914

}

1915

}

1916

#endif /* __linux__ */

1917

exitcode = EX_OSERR;

1918

/* Lower privileges */

1919

errno = 0;

1920

ret = seteuid(uid);

1921

if(ret == -1){

1922

perror_plus("seteuid");

1923

}

1924

goto end;

1925

}

1926

if((network.ifr_flags & IFF_UP) == 0){

1927

network.ifr_flags |= IFF_UP;

1928

take_down_interface = true;

1929

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1930

if(ret == -1){

1931

take_down_interface = false;

1932

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1933

exitcode = EX_OSERR;

1934

#ifdef __linux__

1935

if(restore_loglevel){

1936

ret = klogctl(7, NULL, 0);

1937

if(ret == -1){

1938

perror_plus("klogctl");

2162

/* If no interfaces were specified, make a list */

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

for(int i = 0; i < ret; ++i){

2171

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

perror_plus("argz_add");

2175

continue;

2176

}

2177

if(debug){

2178

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2179

direntries[i]->d_name);

2180

}

2181

}

2182

free(direntries);

2183

} else {

2184

free(direntries);

2185

fprintf_plus(stderr, "Could not find a network interface\n");

2186

exitcode = EXIT_FAILURE;

2187

goto end;

2188

}

2189

}

2190

2191

/* Bring up interfaces which are down, and remove any "none"s */

2192

{

2193

char *interface = NULL;

2194

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2195

interface))){

2196

/* If interface name is "none", stop bringing up interfaces.

2197

Also remove all instances of "none" from the list */

2198

if(strcmp(interface, "none") == 0){

2199

argz_delete(&mc.interfaces, &mc.interfaces_size,

2200

interface);

2201

interface = NULL;

2202

while((interface = argz_next(mc.interfaces,

2203

mc.interfaces_size, interface))){

2204

if(strcmp(interface, "none") == 0){

2205

argz_delete(&mc.interfaces, &mc.interfaces_size,

2206

interface);

2207

interface = NULL;

1939

2208

}

1940

2209

}

1941

#endif /* __linux__ */

1942

/* Lower privileges */

1943

errno = 0;

1944

ret = seteuid(uid);

1945

if(ret == -1){

1946

perror_plus("seteuid");

1947

}

1948

goto end;

1949

}

1950

}

1951

/* Sleep checking until interface is running.

1952

Check every 0.25s, up to total time of delay */

1953

for(int i=0; i < delay * 4; i++){

1954

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1955

if(ret == -1){

1956

perror_plus("ioctl SIOCGIFFLAGS");

1957

} else if(network.ifr_flags & IFF_RUNNING){

1958

2210

break;

1959

2211

}

1960

struct timespec sleeptime = { .tv_nsec = 250000000 };

1961

ret = nanosleep(&sleeptime, NULL);

1962

if(ret == -1 and errno != EINTR){

1963

perror_plus("nanosleep");

1964

}

1965

}

1966

if(not take_down_interface){

1967

/* We won't need the socket anymore */

1968

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1969

if(ret == -1){

1970

perror_plus("close");

1971

}

1972

}

1973

#ifdef __linux__

1974

if(restore_loglevel){

1975

/* Restores kernel loglevel to default */

1976

ret = klogctl(7, NULL, 0);

1977

if(ret == -1){

1978

perror_plus("klogctl");

1979

}

1980

}

1981

#endif /* __linux__ */

1982

/* Lower privileges */

1983

errno = 0;

1984

if(take_down_interface){

1985

/* Lower privileges */

1986

ret = seteuid(uid);

1987

if(ret == -1){

1988

perror_plus("seteuid");

1989

}

1990

} else {

1991

/* Lower privileges permanently */

1992

ret = setuid(uid);

1993

if(ret == -1){

1994

perror_plus("setuid");

1995

}

1996

}

2212

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2214

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2218

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2222

}

2223

}

2224

}

2225

if(debug and (interfaces_to_take_down == NULL)){

2226

fprintf_plus(stderr, "No interfaces were brought up\n");

2227

}

2228

}

2229

2230

/* If we only got one interface, explicitly use only that one */

2231

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2232

if(debug){

2233

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2234

mc.interfaces);

2235

}

2236

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1997

2237

}

1998

2238

1999

2239

if(quit_now){

2000

2240

goto end;

2001

2241

}

2002

2242

2003

ret = init_gnutls_global(pubkey, seckey);

2243

ret = init_gnutls_global(pubkey, seckey, &mc);

2004

2244

if(ret == -1){

2005

fprintf(stderr, "Mandos plugin mandos-client: "

2006

"init_gnutls_global failed\n");

2245

fprintf_plus(stderr, "init_gnutls_global failed\n");

2007

2246

exitcode = EX_UNAVAILABLE;

2008

2247

goto end;

2009

2248

} else {

2024

2263

goto end;

2025

2264

}

2026

2265

2027

if(not init_gpgme(pubkey, seckey, tempdir)){

2028

fprintf(stderr, "Mandos plugin mandos-client: "

2029

"init_gpgme failed\n");

2266

if(not init_gpgme(pubkey, seckey, tempdir, &mc)){

2267

fprintf_plus(stderr, "init_gpgme failed\n");

2030

2268

exitcode = EX_UNAVAILABLE;

2031

2269

goto end;

2032

2270

} else {

2041

2279

/* Connect directly, do not use Zeroconf */

2042

2280

/* (Mainly meant for debugging) */

2043

2281

char *address = strrchr(connect_to, ':');

2282

2044

2283

if(address == NULL){

2045

fprintf(stderr, "Mandos plugin mandos-client: "

2046

"No colon in address\n");

2284

fprintf_plus(stderr, "No colon in address\n");

2047

2285

exitcode = EX_USAGE;

2048

2286

goto end;

2049

2287

}

2052

2290

goto end;

2053

2291

}

2054

2292

2055

uint16_t port;

2293

in_port_t port;

2056

2294

errno = 0;

2057

2295

tmpmax = strtoimax(address+1, &tmp, 10);

2058

2296

if(errno != 0 or tmp == address+1 or *tmp != '\0'

2059

or tmpmax != (uint16_t)tmpmax){

2060

fprintf(stderr, "Mandos plugin mandos-client: "

2061

"Bad port number\n");

2297

or tmpmax != (in_port_t)tmpmax){

2298

fprintf_plus(stderr, "Bad port number\n");

2062

2299

exitcode = EX_USAGE;

2063

2300

goto end;

2064

2301

}

2065

2302

2066

2303

if(quit_now){

2067

2304

goto end;

2068

2305

}

2069

2306

2070

port = (uint16_t)tmpmax;

2307

port = (in_port_t)tmpmax;

2071

2308

*address = '\0';

2072

2309

/* Colon in address indicates IPv6 */

2073

2310

int af;

2089

2326

}

2090

2327

2091

2328

while(not quit_now){

2092

ret = start_mandos_communication(address, port, if_index, af);

2329

ret = start_mandos_communication(address, port, if_index, af,

2330

&mc);

2093

2331

if(quit_now or ret == 0){

2094

2332

break;

2095

2333

}

2096

2334

if(debug){

2097

fprintf(stderr, "Mandos plugin mandos-client: "

2098

"Retrying in %d seconds\n", (int)retry_interval);

2335

fprintf_plus(stderr, "Retrying in %d seconds\n",

2336

(int)retry_interval);

2099

2337

}

2100

sleep((int)retry_interval);

2338

sleep((unsigned int)retry_interval);

2101

2339

}

2102

2340

2103

2341

if (not quit_now){

2121

2359

config.publish_domain = 0;

2122

2360

2123

2361

/* Allocate a new server */

2124

mc.server = avahi_server_new(avahi_simple_poll_get

2125

(mc.simple_poll), &config, NULL,

2126

NULL, &error);

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2127

2364

2128

2365

/* Free the Avahi configuration data */

2129

2366

avahi_server_config_free(&config);

2131

2368

2132

2369

/* Check if creating the Avahi server object succeeded */

2133

2370

if(mc.server == NULL){

2134

fprintf(stderr, "Mandos plugin mandos-client: "

2135

"Failed to create Avahi server: %s\n",

2136

avahi_strerror(error));

2371

fprintf_plus(stderr, "Failed to create Avahi server: %s\n",

2372

avahi_strerror(ret_errno));

2137

2373

exitcode = EX_UNAVAILABLE;

2138

2374

goto end;

2139

2375

}

2145

2381

/* Create the Avahi service browser */

2146

2382

sb = avahi_s_service_browser_new(mc.server, if_index,

2147

2383

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2148

NULL, 0, browse_callback, NULL);

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2149

2386

if(sb == NULL){

2150

fprintf(stderr, "Mandos plugin mandos-client: "

2151

"Failed to create service browser: %s\n",

2152

avahi_strerror(avahi_server_errno(mc.server)));

2387

fprintf_plus(stderr, "Failed to create service browser: %s\n",

2388

avahi_strerror(avahi_server_errno(mc.server)));

2153

2389

exitcode = EX_UNAVAILABLE;

2154

2390

goto end;

2155

2391

}

2161

2397

/* Run the main loop */

2162

2398

2163

2399

if(debug){

2164

fprintf(stderr, "Mandos plugin mandos-client: "

2165

"Starting Avahi loop search\n");

2400

fprintf_plus(stderr, "Starting Avahi loop search\n");

2166

2401

}

2167

2402

2168

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

(int)(retry_interval * 1000));

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

(int)(retry_interval * 1000), &mc);

2170

2405

if(debug){

2171

fprintf(stderr, "Mandos plugin mandos-client: "

2172

"avahi_loop_with_timeout exited %s\n",

2173

(ret == 0) ? "successfully" : "with error");

2406

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

2407

(ret == 0) ? "successfully" : "with error");

2174

2408

}

2175

2409

2176

2410

end:

2177

2411

2178

2412

if(debug){

2179

fprintf(stderr, "Mandos plugin mandos-client: "

2180

"%s exiting\n", argv[0]);

2413

fprintf_plus(stderr, "%s exiting\n", argv[0]);

2181

2414

}

2182

2415

2183

2416

/* Cleanup things */

2417

free(mc.interfaces);

2418

2184

2419

if(sb != NULL)

2185

2420

avahi_s_service_browser_free(sb);

2186

2421

2187

2422

if(mc.server != NULL)

2188

2423

avahi_server_free(mc.server);

2189

2424

2190

if(mc.simple_poll != NULL)

2191

avahi_simple_poll_free(mc.simple_poll);

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2192

2427

2193

2428

if(gnutls_initialized){

2194

2429

gnutls_certificate_free_credentials(mc.cred);

2199

2434

if(gpgme_initialized){

2200

2435

gpgme_release(mc.ctx);

2201

2436

}

2202

2437

2203

2438

/* Cleans up the circular linked list of Mandos servers the client

2204

2439

has seen */

2205

2440

if(mc.current_server != NULL){

2211

2446

}

2212

2447

}

2213

2448

2214

/* XXX run network hooks "stop" here */

2215

2216

/* Take down the network interface */

2217

if(take_down_interface){

2218

/* Re-raise priviliges */

2219

errno = 0;

2220

ret = seteuid(0);

2221

if(ret == -1){

2222

perror_plus("seteuid");

2223

}

2224

if(geteuid() == 0){

2225

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2226

if(ret == -1){

2227

perror_plus("ioctl SIOCGIFFLAGS");

2228

} else if(network.ifr_flags & IFF_UP){

2229

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2230

ret = ioctl(sd, SIOCSIFFLAGS, &network);

2231

if(ret == -1){

2232

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2449

/* Re-raise priviliges */

2450

{

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

/* Take down the network interfaces which were brought up */

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2233

2467

}

2234

2468

}

2235

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2236

if(ret == -1){

2237

perror_plus("close");

2238

}

2239

/* Lower privileges permanently */

2240

errno = 0;

2241

ret = setuid(uid);

2242

if(ret == -1){

2243

perror_plus("setuid");

2469

if(debug and (interfaces_to_take_down == NULL)){

2470

fprintf_plus(stderr, "No interfaces needed to be taken"

2471

" down\n");

2244

2472

}

2245

2473

}

2474

2475

lower_privileges_permanently();

2246

2476

}

2247

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2480

2248

2481

/* Removes the GPGME temp directory and all files inside */

2249

2482

if(tempdir_created){

2250

2483

struct dirent **direntries = NULL;

2263

2496

}

2264

2497

ret = remove(fullname);

2265

2498

if(ret == -1){

2266

fprintf(stderr, "Mandos plugin mandos-client: "

2267

"remove(\"%s\"): %s\n", fullname, strerror(errno));

2499

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2500

strerror(errno));

2268

2501

}

2269

2502

free(fullname);

2270

2503

}