/mandos/trunk : revision 505.3.3

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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, intptr_t */

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#include <stdint.h> /* uint16_t, uint32_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(), _exit() */

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setgid(), pause() */

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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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in_port_t port;

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uint16_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 so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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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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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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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 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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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 false;

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return -1;

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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 false;

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return -1;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.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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*current_server = new_server;

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mc.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 = *current_server;

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

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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->prev->next = new_server;

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(*current_server)->prev = new_server;

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mc.current_server->prev = new_server;

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}

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

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return false;

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return -1;

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}

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return true;

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return 0;

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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, const char *pubkey,

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const char *tempdir, mandos_context *mc){

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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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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_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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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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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_plus(stderr, "bad gpgme_op_import: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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return false;

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}

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}

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if(debug){

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

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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tempdir);

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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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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_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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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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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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mandos_context *mc){

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char **plaintext){

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

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

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"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);

362

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if(rc != GPG_ERR_NO_ERROR){

363

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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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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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){

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

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365

gpgme_data_release(dh_crypto);

375

366

return -1;

376

367

}

377

368

378

369

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

379

370

data buffer */

380

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

371

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

381

372

if(rc != GPG_ERR_NO_ERROR){

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

384

376

plaintext_length = -1;

385

377

if(debug){

386

378

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

379

result = gpgme_op_decrypt_result(mc.ctx);

388

380

if(result == NULL){

389

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

381

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

382

"gpgme_op_decrypt_result failed\n");

390

383

} else {

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);

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);

395

390

if(result->file_name != NULL){

396

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

391

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

392

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

397

393

}

398

394

gpgme_recipient_t recipient;

399

395

recipient = result->recipients;

400

396

while(recipient != NULL){

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");

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");

408

406

recipient = recipient->next;

409

407

}

410

408

}

413

411

}

414

412

415

413

if(debug){

416

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

417

416

}

418

417

419

418

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

426

425

*plaintext = NULL;

427

426

while(true){

428

427

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

431

430

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

435

434

}

436

435

437

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

449

}

451

450

452

451

if(debug){

453

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

452

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

453

"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);

471

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

472

-Wunreachable-code */

472

473

if(ret == NULL)

473

474

ret = "(unknown)";

474

475

return ret;

477

478

/* GnuTLS log function callback */

478

479

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

479

480

const char* string){

480

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

481

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

481

482

}

482

483

484

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

485

const char *seckeyfilename){

486

int ret;

487

488

if(debug){

489

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

489

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

490

"Initializing GnuTLS\n");

490

491

}

491

492

493

ret = gnutls_global_init();

493

494

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

495

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

496

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

496

497

return -1;

497

498

}

498

499

505

506

}

506

507

508

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

510

if(ret != GNUTLS_E_SUCCESS){

510

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

511

safer_gnutls_strerror(ret));

511

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

512

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

512

513

gnutls_global_deinit();

513

514

return -1;

514

515

}

515

516

517

if(debug){

517

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

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);

521

522

}

522

523

524

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

525

(mc.cred, pubkeyfilename, seckeyfilename,

525

526

GNUTLS_OPENPGP_FMT_BASE64);

526

527

if(ret != GNUTLS_E_SUCCESS){

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));

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));

532

534

goto globalfail;

533

535

}

534

536

535

537

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

538

ret = gnutls_dh_params_init(&mc.dh_params);

537

539

if(ret != GNUTLS_E_SUCCESS){

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

540

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

541

"Error in GnuTLS DH parameter initialization:"

542

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

541

543

goto globalfail;

542

544

}

543

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

545

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

544

546

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

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

548

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

549

safer_gnutls_strerror(ret));

547

550

goto globalfail;

548

551

}

549

552

550

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

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

554

552

555

return 0;

553

556

554

557

globalfail:

555

558

556

gnutls_certificate_free_credentials(mc->cred);

559

gnutls_certificate_free_credentials(mc.cred);

557

560

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

561

gnutls_dh_params_deinit(mc.dh_params);

559

562

return -1;

560

563

}

561

564

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

564

566

int ret;

565

567

/* GnuTLS session creation */

566

568

do {

570

572

}

571

573

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

572

574

if(ret != GNUTLS_E_SUCCESS){

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

575

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

576

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

577

safer_gnutls_strerror(ret));

576

578

}

577

579

578

580

{

579

581

const char *err;

580

582

do {

581

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

583

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

582

584

if(quit_now){

583

585

gnutls_deinit(*session);

584

586

return -1;

585

587

}

586

588

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

587

589

if(ret != GNUTLS_E_SUCCESS){

588

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

589

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

590

safer_gnutls_strerror(ret));

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));

591

594

gnutls_deinit(*session);

592

595

return -1;

593

596

}

595

598

596

599

do {

597

600

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

601

mc.cred);

599

602

if(quit_now){

600

603

gnutls_deinit(*session);

601

604

return -1;

602

605

}

603

606

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

604

607

if(ret != GNUTLS_E_SUCCESS){

605

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

606

safer_gnutls_strerror(ret));

608

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

609

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

610

safer_gnutls_strerror(ret));

607

611

gnutls_deinit(*session);

608

612

return -1;

609

613

}

611

615

/* ignore client certificate if any. */

612

616

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

617

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

618

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

619

616

620

return 0;

617

621

}

621

625

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

622

626

623

627

/* Called when a Mandos server is found */

624

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

628

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

625

629

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

630

int af){

627

631

int ret, tcp_sd = -1;

628

632

ssize_t sret;

629

633

union {

654

658

pf = PF_INET;

655

659

break;

656

660

default:

657

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

661

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

662

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

658

663

errno = EINVAL;

659

664

return -1;

660

665

}

661

666

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);

667

ret = init_gnutls_session(&session);

695

668

if(ret != 0){

696

669

return -1;

697

670

}

698

671

699

672

if(debug){

700

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

701

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

673

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

674

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

675

"\n", ip, port);

702

676

}

703

677

704

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

730

704

}

731

705

if(ret == 0){

732

706

int e = errno;

733

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

707

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

708

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

734

709

errno = e;

735

710

goto mandos_end;

736

711

}

737

712

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

713

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

714

-Wconversion and

715

-Wunreachable-code */

716

739

717

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

718

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

741

-Wunreachable-code*/

719

-Wunreachable-code*/

742

720

if(if_index == AVAHI_IF_UNSPEC){

743

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

744

" incomplete without a network interface\n");

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

745

724

errno = EINVAL;

746

725

goto mandos_end;

747

726

}

765

744

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

766

745

perror_plus("if_indextoname");

767

746

} else {

768

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

769

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

747

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

748

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

749

ip, interface, port);

770

750

}

771

751

} else {

772

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

773

ip, (uintmax_t)port);

752

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

753

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

774

754

}

775

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

786

766

perror_plus("inet_ntop");

787

767

} else {

788

768

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

789

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

769

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

770

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

790

771

}

791

772

}

792

773

}

820

801

while(true){

821

802

size_t out_size = strlen(out);

822

803

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

823

out_size - written));

804

out_size - written));

824

805

if(ret == -1){

825

806

int e = errno;

826

807

perror_plus("write");

846

827

}

847

828

848

829

if(debug){

849

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

830

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

831

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

850

832

}

851

833

852

834

if(quit_now){

854

836

goto mandos_end;

855

837

}

856

838

857

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

858

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

859

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

860

gnutls_transport_set_ptr(session,

861

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

839

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

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

862

841

863

842

if(quit_now){

864

843

errno = EINTR;

875

854

876

855

if(ret != GNUTLS_E_SUCCESS){

877

856

if(debug){

878

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

857

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

858

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

879

859

gnutls_perror(ret);

880

860

}

881

861

errno = EPROTO;

885

865

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

886

866

887

867

if(debug){

888

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

889

" %s\n", ip);

868

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

869

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

890

870

}

891

871

892

872

while(true){

897

877

}

898

878

899

879

buffer_capacity = incbuffer(&buffer, buffer_length,

900

buffer_capacity);

880

buffer_capacity);

901

881

if(buffer_capacity == 0){

902

882

int e = errno;

903

883

perror_plus("incbuffer");

930

910

}

931

911

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

932

912

if(ret < 0){

933

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

934

"***\n");

913

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

914

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

935

915

gnutls_perror(ret);

936

916

errno = EPROTO;

937

917

goto mandos_end;

938

918

}

939

919

break;

940

920

default:

941

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

942

" encrypted session with Mandos server\n");

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

943

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

944

925

errno = EIO;

945

926

goto mandos_end;

950

931

}

951

932

952

933

if(debug){

953

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

934

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

935

"Closing TLS session\n");

954

936

}

955

937

956

938

if(quit_now){

968

950

969

951

if(buffer_length > 0){

970

952

ssize_t decrypted_buffer_size;

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

953

decrypted_buffer_size = pgp_packet_decrypt(buffer,

954

buffer_length,

955

&decrypted_buffer);

973

956

if(decrypted_buffer_size >= 0){

974

957

975

958

written = 0;

985

968

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

986

969

int e = errno;

987

970

if(debug){

988

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

989

strerror(errno));

971

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

972

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

973

strerror(errno));

990

974

}

991

975

errno = e;

992

976

goto mandos_end;

1036

1020

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1021

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1022

flags,

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

1023

AVAHI_GCC_UNUSED void* userdata){

1024

assert(r);

1043

1025

1044

1026

/* Called whenever a service has been resolved successfully or

1045

1027

timed out */

1051

1033

switch(event){

1052

1034

default:

1053

1035

case AVAHI_RESOLVER_FAILURE:

1054

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

1055

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

1056

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

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)));

1059

1040

break;

1060

1041

1061

1042

case AVAHI_RESOLVER_FOUND:

1063

1044

char ip[AVAHI_ADDRESS_STR_MAX];

1064

1045

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

1065

1046

if(debug){

1066

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

1067

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

1068

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

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);

1069

1051

}

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1052

int ret = start_mandos_communication(ip, port, interface,

1053

avahi_proto_to_af(proto));

1074

1054

if(ret == 0){

1075

avahi_simple_poll_quit(simple_poll);

1055

avahi_simple_poll_quit(mc.simple_poll);

1076

1056

} else {

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1080

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

1081

" list\n", name);

1082

}

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

1083

1059

}

1084

1060

}

1085

1061

}

1095

1071

const char *domain,

1096

1072

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1073

flags,

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1074

AVAHI_GCC_UNUSED void* userdata){

1075

assert(b);

1102

1076

1103

1077

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

1104

1078

is removed from the LAN */

1111

1085

default:

1112

1086

case AVAHI_BROWSER_FAILURE:

1113

1087

1114

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

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

1092

return;

1119

1093

1120

1094

case AVAHI_BROWSER_NEW:

1123

1097

the callback function is called the Avahi server will free the

1124

1098

resolver for us. */

1125

1099

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1130

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

1131

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

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)));

1134

1106

break;

1135

1107

1136

1108

case AVAHI_BROWSER_REMOVE:

1139

1111

case AVAHI_BROWSER_ALL_FOR_NOW:

1140

1112

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1141

1113

if(debug){

1142

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

1143

" searching...\n");

1114

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

1115

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

1144

1116

}

1145

1117

break;

1146

1118

}

1155

1127

signal_received = sig;

1156

1128

int old_errno = errno;

1157

1129

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1130

if(mc.simple_poll != NULL){

1131

avahi_simple_poll_quit(mc.simple_poll);

1160

1132

}

1161

1133

errno = old_errno;

1162

1134

}

1163

1135

1164

1136

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

1165

1137

int ret;

1166

error_t ret_errno;

1167

1138

1168

1139

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

1169

1140

if(s < 0){

1170

ret_errno = errno;

1171

1141

perror_plus("socket");

1172

errno = ret_errno;

1173

1142

return false;

1174

1143

}

1175

1144

strcpy(ifr->ifr_name, ifname);

1176

1145

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1146

if(ret == -1){

1178

1147

if(debug){

1179

ret_errno = errno;

1180

1148

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

1149

}

1183

1150

return false;

1184

1151

}

1190

1157

/* Reject the loopback device */

1191

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1192

1159

if(debug){

1193

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

1194

ifname);

1160

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

1161

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

1195

1162

}

1196

1163

return false;

1197

1164

}

1198

1165

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

1199

1166

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

1200

1167

if(debug){

1201

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

1202

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

1168

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

1169

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

1203

1170

}

1204

1171

return true;

1205

1172

}

1206

1173

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

1207

1174

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

1208

1175

if(debug){

1209

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1210

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

1176

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

1177

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

1211

1178

}

1212

1179

return false;

1213

1180

}

1214

1181

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

1215

1182

if(ifr->ifr_flags & IFF_NOARP){

1216

1183

if(debug){

1217

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

1218

ifname);

1184

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

1185

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

1219

1186

}

1220

1187

return false;

1221

1188

}

1222

1189

1223

1190

/* Accept this device */

1224

1191

if(debug){

1225

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

1192

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

1193

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

1226

1194

}

1227

1195

return true;

1228

1196

}

1240

1208

struct ifreq ifr;

1241

1209

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

1242

1210

if(debug){

1243

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

1244

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

1245

}

1246

return 0;

1247

}

1248

1249

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

1250

return 0;

1251

}

1252

return 1;

1253

}

1254

1255

/*

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

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;

1285

1268

}

1286

1269

1287

1270

int notdotentries(const struct dirent *direntry){

1298

1281

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

1299

1282

int runnable_hook(const struct dirent *direntry){

1300

1283

int ret;

1301

size_t sret;

1302

1284

struct stat st;

1303

1285

1304

1286

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

1306

1288

return 0;

1307

1289

}

1308

1290

1309

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

1310

"abcdefghijklmnopqrstuvwxyz"

1311

"0123456789"

1312

"_-");

1313

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

1314

/* Contains non-allowed characters */

1315

if(debug){

1316

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

1317

direntry->d_name);

1318

}

1319

return 0;

1320

}

1321

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

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);

1330

1308

if(ret == -1){

1331

1309

if(debug){

1332

perror_plus("Could not stat hook");

1310

perror_plus("Could not stat plugin");

1333

1311

}

1334

1312

return 0;

1335

1313

}

1336

1314

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

1337

1315

/* Not a regular file */

1338

if(debug){

1339

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

1340

direntry->d_name);

1341

}

1342

1316

return 0;

1343

1317

}

1344

1318

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

1345

1319

/* Not executable */

1346

if(debug){

1347

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

1348

direntry->d_name);

1349

}

1350

1320

return 0;

1351

1321

}

1352

if(debug){

1353

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

1354

direntry->d_name);

1355

}

1356

1322

return 1;

1357

1323

}

1358

1324

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1361

1326

int ret;

1362

1327

struct timespec now;

1363

1328

struct timespec waited_time;

1364

1329

intmax_t block_time;

1365

1330

1366

1331

while(true){

1367

if(mc->current_server == NULL){

1332

if(mc.current_server == NULL){

1368

1333

if (debug){

1369

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

1370

" No timeout!\n");

1334

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

1335

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

1371

1336

}

1372

1337

ret = avahi_simple_poll_iterate(s, -1);

1373

1338

} else {

1374

1339

if (debug){

1375

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

1376

" it, or wait\n");

1340

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

1341

"Check current_server if we should run it,"

1342

" or wait\n");

1377

1343

}

1378

1344

/* the current time */

1379

1345

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1384

1350

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

1385

1351

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

1386

1352

waited_time.tv_sec = (now.tv_sec

1387

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

1353

- mc.current_server->last_seen.tv_sec);

1388

1354

waited_time.tv_nsec = (now.tv_nsec

1389

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

1355

- mc.current_server->last_seen.tv_nsec);

1390

1356

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

1391

1357

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

1392

1358

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

1395

1361

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

1396

1362

1397

1363

if (debug){

1398

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

1399

block_time);

1364

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

1365

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

1400

1366

}

1401

1367

1402

1368

if(block_time <= 0){

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

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

1373

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1374

avahi_simple_poll_quit(mc.simple_poll);

1409

1375

return 0;

1410

1376

}

1411

1377

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1378

&mc.current_server->last_seen);

1413

1379

if(ret == -1){

1414

1380

perror_plus("clock_gettime");

1415

1381

return -1;

1416

1382

}

1417

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

1383

mc.current_server = mc.current_server->next;

1418

1384

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

1419

1385

servers, but don't block */

1420

1386

}

1429

1395

}

1430

1396

}

1431

1397

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

const float delay){

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

1507

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1566

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1578

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1615

}

1616

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

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

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

1787

}

1788

1789

1398

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1794

1399

AvahiSServiceBrowser *sb = NULL;

1795

error_t ret_errno;

1400

int error;

1796

1401

int ret;

1797

1402

intmax_t tmpmax;

1798

1403

char *tmp;

1799

1404

int exitcode = EXIT_SUCCESS;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

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;

1802

1411

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

1803

1412

bool tempdir_created = false;

1804

1413

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1414

const char *seckey = PATHDIR "/" SECKEY;

1806

1415

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1416

1810

1417

bool gnutls_initialized = false;

1811

1418

bool gpgme_initialized = false;

1873

1480

.group = 2 },

1874

1481

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

1875

1482

.arg = "SECONDS",

1876

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

1877

.group = 2 },

1878

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

1879

.arg = "DIR",

1880

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

1483

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

1881

1484

.group = 2 },

1882

1485

/*

1883

1486

* These reproduce what we would get without ARGP_NO_HELP

1902

1505

connect_to = arg;

1903

1506

break;

1904

1507

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

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1508

interface = arg;

1910

1509

break;

1911

1510

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

1912

1511

seckey = arg;

1941

1540

argp_error(state, "Bad retry interval");

1942

1541

}

1943

1542

break;

1944

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

1945

hookdir = arg;

1946

break;

1947

1543

/*

1948

1544

* These reproduce what we would get without ARGP_NO_HELP

1949

1545

*/

1955

1551

argp_state_help(state, state->out_stream,

1956

1552

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1957

1553

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

1958

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

1554

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

1555

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

1959

1556

exit(argp_err_exit_status);

1960

1557

break;

1961

1558

default:

1988

1585

{

1989

1586

/* Work around Debian bug #633582:

1990

1587

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

1588

struct stat st;

1991

1589

1992

1590

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

1994

struct stat st;

1995

1996

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

1997

int seckey_fd = open(seckey, O_RDONLY);

1998

if(seckey_fd == -1){

1999

perror_plus("open");

2000

} else {

2001

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

2002

if(ret == -1){

2003

perror_plus("fstat");

2004

} else {

2005

if(S_ISREG(st.st_mode)

2006

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

2007

ret = fchown(seckey_fd, uid, gid);

2008

if(ret == -1){

2009

perror_plus("fchown");

2010

}

2011

}

2012

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2014

}

2015

}

2016

2017

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

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2019

if(pubkey_fd == -1){

2020

perror_plus("open");

2021

} else {

2022

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

2023

if(ret == -1){

2024

perror_plus("fstat");

2025

} else {

2026

if(S_ISREG(st.st_mode)

2027

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

2028

ret = fchown(pubkey_fd, uid, gid);

2029

if(ret == -1){

2030

perror_plus("fchown");

2031

}

2032

}

2033

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2038

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

2056

}

2057

}

2058

}

2059

2060

/* Run network hooks */

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

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);

2076

1737

}

2077

1738

}

2078

1739

2080

1741

avahi_set_log_function(empty_log);

2081

1742

}

2082

1743

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

2083

1778

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

2084

1779

from the signal handler */

2085

1780

/* Initialize the pseudo-RNG for Avahi */

2086

1781

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

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

2089

fprintf_plus(stderr,

2090

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

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

1786

exitcode = EX_UNAVAILABLE;

2092

1787

goto end;

2093

1788

}

2155

1850

}

2156

1851

}

2157

1852

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

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");

2204

1939

}

2205

1940

}

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){

2206

1958

break;

2207

1959

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

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

}

2233

1997

}

2234

1998

2235

1999

if(quit_now){

2236

2000

goto end;

2237

2001

}

2238

2002

2239

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

2003

ret = init_gnutls_global(pubkey, seckey);

2240

2004

if(ret == -1){

2241

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

2005

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

2006

"init_gnutls_global failed\n");

2242

2007

exitcode = EX_UNAVAILABLE;

2243

2008

goto end;

2244

2009

} else {

2259

2024

goto end;

2260

2025

}

2261

2026

2262

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

2263

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

2027

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

2028

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

2029

"init_gpgme failed\n");

2264

2030

exitcode = EX_UNAVAILABLE;

2265

2031

goto end;

2266

2032

} else {

2275

2041

/* Connect directly, do not use Zeroconf */

2276

2042

/* (Mainly meant for debugging) */

2277

2043

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

2278

2279

2044

if(address == NULL){

2280

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

2045

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

2046

"No colon in address\n");

2281

2047

exitcode = EX_USAGE;

2282

2048

goto end;

2283

2049

}

2286

2052

goto end;

2287

2053

}

2288

2054

2289

in_port_t port;

2055

uint16_t port;

2290

2056

errno = 0;

2291

2057

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

2292

2058

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

2293

or tmpmax != (in_port_t)tmpmax){

2294

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

2059

or tmpmax != (uint16_t)tmpmax){

2060

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

2061

"Bad port number\n");

2295

2062

exitcode = EX_USAGE;

2296

2063

goto end;

2297

2064

}

2298

2065

2299

2066

if(quit_now){

2300

2067

goto end;

2301

2068

}

2302

2069

2303

port = (in_port_t)tmpmax;

2070

port = (uint16_t)tmpmax;

2304

2071

*address = '\0';

2305

2072

/* Colon in address indicates IPv6 */

2306

2073

int af;

2322

2089

}

2323

2090

2324

2091

while(not quit_now){

2325

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

2326

&mc);

2092

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

2327

2093

if(quit_now or ret == 0){

2328

2094

break;

2329

2095

}

2330

2096

if(debug){

2331

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

2332

(int)retry_interval);

2097

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

2098

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

2333

2099

}

2334

sleep((unsigned int)retry_interval);

2100

sleep((int)retry_interval);

2335

2101

}

2336

2102

2337

2103

if (not quit_now){

2355

2121

config.publish_domain = 0;

2356

2122

2357

2123

/* Allocate a new server */

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2124

mc.server = avahi_server_new(avahi_simple_poll_get

2125

(mc.simple_poll), &config, NULL,

2126

NULL, &error);

2360

2127

2361

2128

/* Free the Avahi configuration data */

2362

2129

avahi_server_config_free(&config);

2364

2131

2365

2132

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

2366

2133

if(mc.server == NULL){

2367

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

2368

avahi_strerror(ret_errno));

2134

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

2135

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

2136

avahi_strerror(error));

2369

2137

exitcode = EX_UNAVAILABLE;

2370

2138

goto end;

2371

2139

}

2377

2145

/* Create the Avahi service browser */

2378

2146

sb = avahi_s_service_browser_new(mc.server, if_index,

2379

2147

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2148

NULL, 0, browse_callback, NULL);

2382

2149

if(sb == NULL){

2383

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

2384

avahi_strerror(avahi_server_errno(mc.server)));

2150

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

2151

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

2152

avahi_strerror(avahi_server_errno(mc.server)));

2385

2153

exitcode = EX_UNAVAILABLE;

2386

2154

goto end;

2387

2155

}

2393

2161

/* Run the main loop */

2394

2162

2395

2163

if(debug){

2396

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

2164

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

2165

"Starting Avahi loop search\n");

2397

2166

}

2398

2167

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2168

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

(int)(retry_interval * 1000));

2401

2170

if(debug){

2402

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

2403

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

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

2173

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

2404

2174

}

2405

2175

2406

2176

end:

2407

2177

2408

2178

if(debug){

2409

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

2179

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

2180

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

2410

2181

}

2411

2182

2412

2183

/* Cleanup things */

2413

free(mc.interfaces);

2414

2415

2184

if(sb != NULL)

2416

2185

avahi_s_service_browser_free(sb);

2417

2186

2418

2187

if(mc.server != NULL)

2419

2188

avahi_server_free(mc.server);

2420

2189

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2190

if(mc.simple_poll != NULL)

2191

avahi_simple_poll_free(mc.simple_poll);

2423

2192

2424

2193

if(gnutls_initialized){

2425

2194

gnutls_certificate_free_credentials(mc.cred);

2430

2199

if(gpgme_initialized){

2431

2200

gpgme_release(mc.ctx);

2432

2201

}

2433

2202

2434

2203

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

2435

2204

has seen */

2436

2205

if(mc.current_server != NULL){

2442

2211

}

2443

2212

}

2444

2213

2445

/* Re-raise priviliges */

2446

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

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");

2463

2233

}

2464

2234

}

2465

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

2466

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

2467

" down\n");

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");

2468

2244

}

2469

2245

}

2470

2471

lower_privileges_permanently();

2472

2246

}

2473

2247

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2476

2477

2248

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

2478

2249

if(tempdir_created){

2479

2250

struct dirent **direntries = NULL;

2492

2263

}

2493

2264

ret = remove(fullname);

2494

2265

if(ret == -1){

2495

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

2496

strerror(errno));

2266

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

2267

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

2497

2268

}

2498

2269

free(fullname);

2499

2270

}