/mandos/trunk : revision 604

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

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*

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* Everything else is

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*

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* This program is free software: you can redistribute it and/or

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* modify it under the terms of the GNU General Public License as

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

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stdout, ferror(), remove() */

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#include <stdint.h> /* uint16_t, uint32_t */

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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

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#include <stddef.h> /* NULL, size_t, ssize_t */

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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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#include <sys/stat.h> /* open() */

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#include <sys/stat.h> /* open(), S_ISREG */

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#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect() */

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#include <fcntl.h> /* open() */

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause() */

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

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

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

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

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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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__attribute__((format (gnu_printf, 2, 3)))

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int fprintf_plus(FILE *stream, const char *format, ...){

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va_list ap;

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va_start (ap, format);

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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

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

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}

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* "buffer_length" is how much is already used.

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*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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}

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/* Add server to set of servers to retry periodically */

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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

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int af, server **current_server){

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int ret;

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server *new_server = malloc(sizeof(server));

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

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return false;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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*current_server = new_server;

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

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} else {

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new_server->next = mc.current_server;

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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(*current_server)->prev = new_server;

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}

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

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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return false;

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}

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return 0;

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return true;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

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

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

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tempdir);

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return false;

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}

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/* Create new GPGME "context" */

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

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

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "bad gpgme_new: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strerror(rc));

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return false;

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}

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*/

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

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size_t crypto_size,

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char **plaintext){

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char **plaintext,

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mandos_context *mc){

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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ssize_t ret;

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ssize_t plaintext_length = 0;

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if(debug){

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

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

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}

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

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

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0);

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if(rc != GPG_ERR_NO_ERROR){

351

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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return -1;

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}

355

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

357

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rc = gpgme_data_new(&dh_plain);

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if(rc != GPG_ERR_NO_ERROR){

359

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_data_release(dh_crypto);

362

375

return -1;

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376

}

364

377

365

378

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

366

379

data buffer */

367

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

380

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

368

381

if(rc != GPG_ERR_NO_ERROR){

369

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

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gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

372

385

if(debug){

373

386

gpgme_decrypt_result_t result;

374

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

375

388

if(result == NULL){

376

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

389

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

377

390

} else {

378

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

379

result->unsupported_algorithm);

380

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

381

result->wrong_key_usage);

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

382

395

if(result->file_name != NULL){

383

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

396

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

384

397

}

385

398

gpgme_recipient_t recipient;

386

399

recipient = result->recipients;

387

400

while(recipient != NULL){

388

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

389

gpgme_pubkey_algo_name(recipient->pubkey_algo));

390

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

391

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

392

recipient->status == GPG_ERR_NO_SECKEY

393

? "No" : "Yes");

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

394

408

recipient = recipient->next;

395

409

}

396

410

}

399

413

}

400

414

401

415

if(debug){

402

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

416

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

403

417

}

404

418

405

419

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

412

426

*plaintext = NULL;

413

427

while(true){

414

428

plaintext_capacity = incbuffer(plaintext,

415

(size_t)plaintext_length,

416

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

417

431

if(plaintext_capacity == 0){

418

perror_plus("incbuffer");

419

plaintext_length = -1;

420

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

421

435

}

422

436

423

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

450

}

437

451

438

452

if(debug){

439

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

453

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

440

454

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

441

455

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

442

456

}

454

468

}

455

469

456

470

static const char * safer_gnutls_strerror(int value){

457

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

458

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

459

472

if(ret == NULL)

460

473

ret = "(unknown)";

461

474

return ret;

464

477

/* GnuTLS log function callback */

465

478

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

466

479

const char* string){

467

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

480

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

468

481

}

469

482

470

483

static int init_gnutls_global(const char *pubkeyfilename,

471

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

472

486

int ret;

473

487

474

488

if(debug){

475

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

489

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

476

490

}

477

491

478

492

ret = gnutls_global_init();

479

493

if(ret != GNUTLS_E_SUCCESS){

480

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

481

safer_gnutls_strerror(ret));

494

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

495

safer_gnutls_strerror(ret));

482

496

return -1;

483

497

}

484

498

491

505

}

492

506

493

507

/* OpenPGP credentials */

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

495

509

if(ret != GNUTLS_E_SUCCESS){

496

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

497

safer_gnutls_strerror(ret));

510

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

511

safer_gnutls_strerror(ret));

498

512

gnutls_global_deinit();

499

513

return -1;

500

514

}

501

515

502

516

if(debug){

503

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

504

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

505

seckeyfilename);

517

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

506

521

}

507

522

508

523

ret = gnutls_certificate_set_openpgp_key_file

509

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

510

525

GNUTLS_OPENPGP_FMT_BASE64);

511

526

if(ret != GNUTLS_E_SUCCESS){

512

fprintf(stderr,

513

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

514

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

515

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

516

safer_gnutls_strerror(ret));

527

fprintf_plus(stderr,

528

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

529

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

530

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

531

safer_gnutls_strerror(ret));

517

532

goto globalfail;

518

533

}

519

534

520

535

/* GnuTLS server initialization */

521

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

522

537

if(ret != GNUTLS_E_SUCCESS){

523

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

524

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

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

525

541

goto globalfail;

526

542

}

527

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

543

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

528

544

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

531

547

goto globalfail;

532

548

}

533

549

534

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

535

551

536

552

return 0;

537

553

538

554

globalfail:

539

555

540

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

541

557

gnutls_global_deinit();

542

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

543

559

return -1;

544

560

}

545

561

546

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

547

564

int ret;

548

565

/* GnuTLS session creation */

549

566

do {

553

570

}

554

571

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

555

572

if(ret != GNUTLS_E_SUCCESS){

556

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

557

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

558

576

}

559

577

560

578

{

561

579

const char *err;

562

580

do {

563

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

581

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

564

582

if(quit_now){

565

583

gnutls_deinit(*session);

566

584

return -1;

567

585

}

568

586

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

569

587

if(ret != GNUTLS_E_SUCCESS){

570

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

571

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

572

safer_gnutls_strerror(ret));

588

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

589

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

590

safer_gnutls_strerror(ret));

573

591

gnutls_deinit(*session);

574

592

return -1;

575

593

}

577

595

578

596

do {

579

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

580

mc.cred);

598

mc->cred);

581

599

if(quit_now){

582

600

gnutls_deinit(*session);

583

601

return -1;

584

602

}

585

603

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

586

604

if(ret != GNUTLS_E_SUCCESS){

587

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

588

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

589

607

gnutls_deinit(*session);

590

608

return -1;

591

609

}

593

611

/* ignore client certificate if any. */

594

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

595

613

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

597

615

598

616

return 0;

599

617

}

603

621

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

604

622

605

623

/* Called when a Mandos server is found */

606

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

624

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

607

625

AvahiIfIndex if_index,

608

int af){

626

int af, mandos_context *mc){

609

627

int ret, tcp_sd = -1;

610

628

ssize_t sret;

611

629

union {

636

654

pf = PF_INET;

637

655

break;

638

656

default:

639

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

657

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

640

658

errno = EINVAL;

641

659

return -1;

642

660

}

643

661

644

ret = init_gnutls_session(&session);

662

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

663

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

664

bool match = false;

665

{

666

char *interface = NULL;

667

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

668

interface))){

669

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

670

match = true;

671

break;

672

}

673

}

674

}

675

if(not match){

676

if(debug){

677

char interface[IF_NAMESIZE];

678

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

679

perror_plus("if_indextoname");

680

} else {

681

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

682

" \"%s\"\n",

683

if_indextoname((unsigned int)if_index,

684

interface));

685

}

686

}

687

return -1;

688

}

689

}

690

691

ret = init_gnutls_session(&session, mc);

645

692

if(ret != 0){

646

693

return -1;

647

694

}

648

695

649

696

if(debug){

650

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

651

"\n", ip, port);

697

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

698

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

652

699

}

653

700

654

701

tcp_sd = socket(pf, SOCK_STREAM, 0);

680

727

}

681

728

if(ret == 0){

682

729

int e = errno;

683

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

730

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

684

731

errno = e;

685

732

goto mandos_end;

686

733

}

687

734

if(af == AF_INET6){

688

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

689

-Wconversion and

690

-Wunreachable-code */

691

735

to.in6.sin6_port = htons(port);

692

736

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

737

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

694

-Wunreachable-code*/

738

-Wunreachable-code*/

695

739

if(if_index == AVAHI_IF_UNSPEC){

696

fprintf(stderr, "An IPv6 link-local address is incomplete"

697

" without a network interface\n");

740

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

741

" incomplete without a network interface\n");

698

742

errno = EINVAL;

699

743

goto mandos_end;

700

744

}

718

762

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

719

763

perror_plus("if_indextoname");

720

764

} else {

721

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

722

ip, interface, port);

765

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

766

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

723

767

}

724

768

} else {

725

fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,

726

port);

769

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

770

ip, (uintmax_t)port);

727

771

}

728

772

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

729

773

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

739

783

perror_plus("inet_ntop");

740

784

} else {

741

785

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

742

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

786

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

743

787

}

744

788

}

745

789

}

773

817

while(true){

774

818

size_t out_size = strlen(out);

775

819

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

776

out_size - written));

820

out_size - written));

777

821

if(ret == -1){

778

822

int e = errno;

779

823

perror_plus("write");

799

843

}

800

844

801

845

if(debug){

802

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

846

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

803

847

}

804

848

805

849

if(quit_now){

807

851

goto mandos_end;

808

852

}

809

853

810

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

811

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

854

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

855

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

856

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

857

gnutls_transport_set_ptr(session,

858

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

812

859

813

860

if(quit_now){

814

861

errno = EINTR;

825

872

826

873

if(ret != GNUTLS_E_SUCCESS){

827

874

if(debug){

828

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

875

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

829

876

gnutls_perror(ret);

830

877

}

831

878

errno = EPROTO;

835

882

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

836

883

837

884

if(debug){

838

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

839

ip);

885

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

886

" %s\n", ip);

840

887

}

841

888

842

889

while(true){

847

894

}

848

895

849

896

buffer_capacity = incbuffer(&buffer, buffer_length,

850

buffer_capacity);

897

buffer_capacity);

851

898

if(buffer_capacity == 0){

852

899

int e = errno;

853

900

perror_plus("incbuffer");

880

927

}

881

928

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

882

929

if(ret < 0){

883

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

930

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

931

"***\n");

884

932

gnutls_perror(ret);

885

933

errno = EPROTO;

886

934

goto mandos_end;

887

935

}

888

936

break;

889

937

default:

890

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

891

" encrypted session with Mandos server\n");

938

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

939

" encrypted session with Mandos server\n");

892

940

gnutls_bye(session, GNUTLS_SHUT_RDWR);

893

941

errno = EIO;

894

942

goto mandos_end;

899

947

}

900

948

901

949

if(debug){

902

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

950

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

903

951

}

904

952

905

953

if(quit_now){

917

965

918

966

if(buffer_length > 0){

919

967

ssize_t decrypted_buffer_size;

920

decrypted_buffer_size = pgp_packet_decrypt(buffer,

921

buffer_length,

922

&decrypted_buffer);

968

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

969

&decrypted_buffer, mc);

923

970

if(decrypted_buffer_size >= 0){

924

971

925

972

written = 0;

935

982

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

936

983

int e = errno;

937

984

if(debug){

938

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

939

strerror(errno));

985

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

986

strerror(errno));

940

987

}

941

988

errno = e;

942

989

goto mandos_end;

986

1033

AVAHI_GCC_UNUSED AvahiStringList *txt,

987

1034

AVAHI_GCC_UNUSED AvahiLookupResultFlags

988

1035

flags,

989

AVAHI_GCC_UNUSED void* userdata){

990

assert(r);

1036

void* mc){

1037

if(r == NULL){

1038

return;

1039

}

991

1040

992

1041

/* Called whenever a service has been resolved successfully or

993

1042

timed out */

999

1048

switch(event){

1000

1049

default:

1001

1050

case AVAHI_RESOLVER_FAILURE:

1002

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

1003

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

1004

avahi_strerror(avahi_server_errno(mc.server)));

1051

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

1052

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

1053

domain,

1054

avahi_strerror(avahi_server_errno

1055

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

1005

1056

break;

1006

1057

1007

1058

case AVAHI_RESOLVER_FOUND:

1009

1060

char ip[AVAHI_ADDRESS_STR_MAX];

1010

1061

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

1011

1062

if(debug){

1012

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

1013

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

1014

ip, (intmax_t)interface, port);

1063

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

1064

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

1065

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

1015

1066

}

1016

int ret = start_mandos_communication(ip, port, interface,

1017

avahi_proto_to_af(proto));

1067

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

1068

interface,

1069

avahi_proto_to_af(proto),

1070

mc);

1018

1071

if(ret == 0){

1019

avahi_simple_poll_quit(mc.simple_poll);

1072

avahi_simple_poll_quit(simple_poll);

1020

1073

} else {

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

1074

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

1075

avahi_proto_to_af(proto),

1076

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

1077

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

1078

" list\n", name);

1079

}

1023

1080

}

1024

1081

}

1025

1082

}

1035

1092

const char *domain,

1036

1093

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1037

1094

flags,

1038

AVAHI_GCC_UNUSED void* userdata){

1039

assert(b);

1095

void* mc){

1096

if(b == NULL){

1097

return;

1098

}

1040

1099

1041

1100

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

1042

1101

is removed from the LAN */

1049

1108

default:

1050

1109

case AVAHI_BROWSER_FAILURE:

1051

1110

1052

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

1053

avahi_strerror(avahi_server_errno(mc.server)));

1054

avahi_simple_poll_quit(mc.simple_poll);

1111

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

1112

avahi_strerror(avahi_server_errno

1113

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

1114

avahi_simple_poll_quit(simple_poll);

1055

1115

return;

1056

1116

1057

1117

case AVAHI_BROWSER_NEW:

1060

1120

the callback function is called the Avahi server will free the

1061

1121

resolver for us. */

1062

1122

1063

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

1064

name, type, domain, protocol, 0,

1065

resolve_callback, NULL) == NULL)

1066

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

1067

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

1123

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

1124

interface, protocol, name, type,

1125

domain, protocol, 0,

1126

resolve_callback, mc) == NULL)

1127

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

1128

" %s\n", name,

1129

avahi_strerror(avahi_server_errno

1130

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

1068

1131

break;

1069

1132

1070

1133

case AVAHI_BROWSER_REMOVE:

1073

1136

case AVAHI_BROWSER_ALL_FOR_NOW:

1074

1137

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1075

1138

if(debug){

1076

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

1139

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

1140

" searching...\n");

1077

1141

}

1078

1142

break;

1079

1143

}

1088

1152

signal_received = sig;

1089

1153

int old_errno = errno;

1090

1154

/* set main loop to exit */

1091

if(mc.simple_poll != NULL){

1092

avahi_simple_poll_quit(mc.simple_poll);

1155

if(simple_poll != NULL){

1156

avahi_simple_poll_quit(simple_poll);

1093

1157

}

1094

1158

errno = old_errno;

1095

1159

}

1096

1160

1097

1161

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

1098

1162

int ret;

1163

error_t ret_errno;

1099

1164

1100

1165

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

1101

1166

if(s < 0){

1167

ret_errno = errno;

1102

1168

perror_plus("socket");

1169

errno = ret_errno;

1103

1170

return false;

1104

1171

}

1105

1172

strcpy(ifr->ifr_name, ifname);

1106

1173

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1107

1174

if(ret == -1){

1108

1175

if(debug){

1176

ret_errno = errno;

1109

1177

perror_plus("ioctl SIOCGIFFLAGS");

1178

errno = ret_errno;

1110

1179

}

1111

1180

return false;

1112

1181

}

1118

1187

/* Reject the loopback device */

1119

1188

if(ifr->ifr_flags & IFF_LOOPBACK){

1120

1189

if(debug){

1121

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

1122

ifname);

1190

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

1191

ifname);

1123

1192

}

1124

1193

return false;

1125

1194

}

1126

1195

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

1127

1196

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

1128

1197

if(debug){

1129

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1130

ifname);

1198

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

1199

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

1131

1200

}

1132

1201

return true;

1133

1202

}

1134

1203

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

1135

1204

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

1136

1205

if(debug){

1137

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1138

ifname);

1206

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1207

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

1139

1208

}

1140

1209

return false;

1141

1210

}

1142

1211

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

1143

1212

if(ifr->ifr_flags & IFF_NOARP){

1144

1213

if(debug){

1145

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

1214

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

1215

ifname);

1146

1216

}

1147

1217

return false;

1148

1218

}

1149

1219

1150

1220

/* Accept this device */

1151

1221

if(debug){

1152

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

1222

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

1153

1223

}

1154

1224

return true;

1155

1225

}

1160

1230

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

1161

1231

*/

1162

1232

int good_interface(const struct dirent *if_entry){

1163

int ret;

1164

1233

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

1165

1234

return 0;

1166

1235

}

1236

1167

1237

struct ifreq ifr;

1168

1169

1238

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

1239

if(debug){

1240

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

1241

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

1242

}

1170

1243

return 0;

1171

1244

}

1172

1245

1177

1250

}

1178

1251

1179

1252

/*

1180

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

1181

* corresponds to an acceptable network device which is up.

1182

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

1253

* This function determines if a network interface is up.

1183

1254

*/

1184

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

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

1188

return 0;

1189

}

1190

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1191

if_entry->d_name);

1192

if(ret < 0){

1193

perror_plus("asprintf");

1194

return 0;

1195

}

1196

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1197

if(flags_fd == -1){

1198

perror_plus("open");

1199

free(flagname);

1200

return 0;

1201

}

1202

free(flagname);

1203

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1204

/* read line from flags_fd */

1205

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1206

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1207

flagstring[(size_t)to_read] = '\0';

1208

if(flagstring == NULL){

1209

perror_plus("malloc");

1210

close(flags_fd);

1211

return 0;

1212

}

1213

while(to_read > 0){

1214

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1215

(size_t)to_read));

1216

if(ssret == -1){

1217

perror_plus("read");

1218

free(flagstring);

1219

close(flags_fd);

1220

return 0;

1221

}

1222

to_read -= ssret;

1223

if(ssret == 0){

1224

break;

1225

}

1226

}

1227

close(flags_fd);

1228

intmax_t tmpmax;

1229

char *tmp;

1230

errno = 0;

1231

tmpmax = strtoimax(flagstring, &tmp, 0);

1232

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1233

and not (isspace(*tmp)))

1234

or tmpmax != (ifreq_flags)tmpmax){

1235

if(debug){

1236

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1237

flagstring, if_entry->d_name);

1238

}

1239

free(flagstring);

1240

return 0;

1241

}

1242

free(flagstring);

1243

ifreq_flags flags = (ifreq_flags)tmpmax;

1244

/* Reject the loopback device */

1245

if(flags & IFF_LOOPBACK){

1246

if(debug){

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1255

bool interface_is_up(const char *interface){

1256

struct ifreq ifr;

1257

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

1258

if(debug){

1259

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

1260

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

1261

}

1262

return false;

1263

}

1264

1265

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

1266

}

1252

1267

1253

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1268

/*

1269

* This function determines if a network interface is running

1270

*/

1271

bool interface_is_running(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1256

1279

}

1257

1280

1258

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

1259

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1260

if(debug){

1261

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1285

if_entry->d_name);

1286

}

1287

return 1;

1281

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

1288

1282

}

1289

1283

1290

1284

int notdotentries(const struct dirent *direntry){

1301

1295

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

1302

1296

int runnable_hook(const struct dirent *direntry){

1303

1297

int ret;

1298

size_t sret;

1304

1299

struct stat st;

1305

1300

1306

1301

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

1308

1303

return 0;

1309

1304

}

1310

1305

1311

/* Save pointer to last character */

1312

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

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

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

1320

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

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

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

1306

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

1307

"abcdefghijklmnopqrstuvwxyz"

1308

"0123456789"

1309

"_-");

1310

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

1311

/* Contains non-allowed characters */

1312

if(debug){

1313

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

1314

direntry->d_name);

1315

}

1316

return 0;

1317

}

1318

1319

char *fullname = NULL;

1320

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

1321

if(ret < 0){

1322

perror_plus("asprintf");

1323

return 0;

1324

}

1325

1326

ret = stat(fullname, &st);

1328

1327

if(ret == -1){

1329

1328

if(debug){

1330

perror_plus("Could not stat plugin");

1329

perror_plus("Could not stat hook");

1331

1330

}

1332

1331

return 0;

1333

1332

}

1334

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

1333

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

1335

1334

/* Not a regular file */

1335

if(debug){

1336

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

1337

direntry->d_name);

1338

}

1336

1339

return 0;

1337

1340

}

1338

1341

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

1339

1342

/* Not executable */

1343

if(debug){

1344

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

1345

direntry->d_name);

1346

}

1340

1347

return 0;

1341

1348

}

1349

if(debug){

1350

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

1351

direntry->d_name);

1352

}

1342

1353

return 1;

1343

1354

}

1344

1355

1345

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1356

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1357

mandos_context *mc){

1346

1358

int ret;

1347

1359

struct timespec now;

1348

1360

struct timespec waited_time;

1349

1361

intmax_t block_time;

1350

1362

1351

1363

while(true){

1352

if(mc.current_server == NULL){

1364

if(mc->current_server == NULL){

1353

1365

if (debug){

1354

fprintf(stderr,

1355

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

1366

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

1367

" No timeout!\n");

1356

1368

}

1357

1369

ret = avahi_simple_poll_iterate(s, -1);

1358

1370

} else {

1359

1371

if (debug){

1360

fprintf(stderr, "Check current_server if we should run it,"

1361

" or wait\n");

1372

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

1373

" it, or wait\n");

1362

1374

}

1363

1375

/* the current time */

1364

1376

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1369

1381

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

1370

1382

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

1371

1383

waited_time.tv_sec = (now.tv_sec

1372

- mc.current_server->last_seen.tv_sec);

1384

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

1373

1385

waited_time.tv_nsec = (now.tv_nsec

1374

- mc.current_server->last_seen.tv_nsec);

1386

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

1375

1387

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

1376

1388

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

1377

1389

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

1380

1392

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

1381

1393

1382

1394

if (debug){

1383

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

1395

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

1396

block_time);

1384

1397

}

1385

1398

1386

1399

if(block_time <= 0){

1387

ret = start_mandos_communication(mc.current_server->ip,

1388

mc.current_server->port,

1389

mc.current_server->if_index,

1390

mc.current_server->af);

1400

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

1401

mc->current_server->port,

1402

mc->current_server->if_index,

1403

mc->current_server->af, mc);

1391

1404

if(ret == 0){

1392

avahi_simple_poll_quit(mc.simple_poll);

1405

avahi_simple_poll_quit(s);

1393

1406

return 0;

1394

1407

}

1395

1408

ret = clock_gettime(CLOCK_MONOTONIC,

1396

&mc.current_server->last_seen);

1409

&mc->current_server->last_seen);

1397

1410

if(ret == -1){

1398

1411

perror_plus("clock_gettime");

1399

1412

return -1;

1400

1413

}

1401

mc.current_server = mc.current_server->next;

1414

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

1402

1415

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

1403

1416

servers, but don't block */

1404

1417

}

1406

1419

ret = avahi_simple_poll_iterate(s, (int)block_time);

1407

1420

}

1408

1421

if(ret != 0){

1409

if (ret > 0 or errno != EINTR) {

1422

if (ret > 0 or errno != EINTR){

1410

1423

return (ret != 1) ? ret : 0;

1411

1424

}

1412

1425

}

1413

1426

}

1414

1427

}

1415

1428

1429

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

1430

error_t raise_privileges(void){

1431

error_t old_errno = errno;

1432

error_t ret_errno = 0;

1433

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

1434

ret_errno = errno;

1435

perror_plus("seteuid");

1436

}

1437

errno = old_errno;

1438

return ret_errno;

1439

}

1440

1441

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

1442

error_t raise_privileges_permanently(void){

1443

error_t old_errno = errno;

1444

error_t ret_errno = raise_privileges();

1445

if(ret_errno != 0){

1446

errno = old_errno;

1447

return ret_errno;

1448

}

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t lower_privileges(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = 0;

1461

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

1462

ret_errno = errno;

1463

perror_plus("seteuid");

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

/* Lower privileges permanently */

1470

error_t lower_privileges_permanently(void){

1471

error_t old_errno = errno;

1472

error_t ret_errno = 0;

1473

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

1474

ret_errno = errno;

1475

perror_plus("setuid");

1476

}

1477

errno = old_errno;

1478

return ret_errno;

1479

}

1480

1481

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

1482

const float delay){

1483

struct dirent **direntries;

1484

struct dirent *direntry;

1485

int ret;

1486

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

1487

alphasort);

1488

if(numhooks == -1){

1489

if(errno == ENOENT){

1490

if(debug){

1491

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

1492

" found\n", hookdir);

1493

}

1494

} else {

1495

perror_plus("scandir");

1496

}

1497

} else {

1498

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

1499

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

1500

direntry = direntries[i];

1501

char *fullname = NULL;

1502

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

1503

if(ret < 0){

1504

perror_plus("asprintf");

1505

continue;

1506

}

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

pid_t hook_pid = fork();

1512

if(hook_pid == 0){

1513

/* Child */

1514

/* Raise privileges */

1515

raise_privileges_permanently();

1516

/* Set group */

1517

errno = 0;

1518

ret = setgid(0);

1519

if(ret == -1){

1520

perror_plus("setgid");

1521

}

1522

/* Reset supplementary groups */

1523

errno = 0;

1524

ret = setgroups(0, NULL);

1525

if(ret == -1){

1526

perror_plus("setgroups");

1527

}

1528

dup2(devnull, STDIN_FILENO);

1529

close(devnull);

1530

dup2(STDERR_FILENO, STDOUT_FILENO);

1531

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

1532

if(ret == -1){

1533

perror_plus("setenv");

1534

_exit(EX_OSERR);

1535

}

1536

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

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

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

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

char *delaystring;

1552

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

1553

if(ret == -1){

1554

perror_plus("asprintf");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

free(delaystring);

1560

perror_plus("setenv");

1561

_exit(EX_OSERR);

1562

}

1563

free(delaystring);

1564

if(connect_to != NULL){

1565

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

1566

if(ret == -1){

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1570

}

1571

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

1572

perror_plus("execl");

1573

_exit(EXIT_FAILURE);

1574

}

1575

} else {

1576

int status;

1577

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

1578

perror_plus("waitpid");

1579

free(fullname);

1580

continue;

1581

}

1582

if(WIFEXITED(status)){

1583

if(WEXITSTATUS(status) != 0){

1584

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

1585

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

1586

WEXITSTATUS(status));

1587

free(fullname);

1588

continue;

1589

}

1590

} else if(WIFSIGNALED(status)){

1591

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

1592

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

1593

WTERMSIG(status));

1594

free(fullname);

1595

continue;

1596

} else {

1597

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

1598

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

1599

free(fullname);

1600

continue;

1601

}

1602

}

1603

free(fullname);

1604

if(debug){

1605

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

1606

direntry->d_name);

1607

}

1608

}

1609

close(devnull);

1610

}

1611

return true;

1612

}

1613

1614

error_t bring_up_interface(const char *const interface,

1615

const float delay){

1616

int sd = -1;

1617

error_t old_errno = errno;

1618

error_t ret_errno = 0;

1619

int ret, ret_setflags;

1620

struct ifreq network;

1621

unsigned int if_index = if_nametoindex(interface);

1622

if(if_index == 0){

1623

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

1624

errno = old_errno;

1625

return ENXIO;

1626

}

1627

1628

if(quit_now){

1629

errno = old_errno;

1630

return EINTR;

1631

}

1632

1633

if(not interface_is_up(interface)){

1634

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

1635

ret_errno = errno;

1636

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

1637

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

1638

return ret_errno;

1639

}

1640

network.ifr_flags |= IFF_UP;

1641

1642

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1643

if(sd < 0){

1644

ret_errno = errno;

1645

perror_plus("socket");

1646

errno = old_errno;

1647

return ret_errno;

1648

}

1649

1650

if(quit_now){

1651

close(sd);

1652

errno = old_errno;

1653

return EINTR;

1654

}

1655

1656

if(debug){

1657

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

1658

interface);

1659

}

1660

1661

/* Raise priviliges */

1662

raise_privileges();

1663

1664

#ifdef __linux__

1665

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1666

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

1667

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

1668

bool restore_loglevel = true;

1669

if(ret_linux == -1){

1670

restore_loglevel = false;

1671

perror_plus("klogctl");

1672

}

1673

#endif /* __linux__ */

1674

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

1675

ret_errno = errno;

1676

#ifdef __linux__

1677

if(restore_loglevel){

1678

ret_linux = klogctl(7, NULL, 0);

1679

if(ret_linux == -1){

1680

perror_plus("klogctl");

1681

}

1682

}

1683

#endif /* __linux__ */

1684

1685

/* Lower privileges */

1686

lower_privileges();

1687

1688

/* Close the socket */

1689

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

1690

if(ret == -1){

1691

perror_plus("close");

1692

}

1693

1694

if(ret_setflags == -1){

1695

errno = ret_errno;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

errno = old_errno;

1698

return ret_errno;

1699

}

1700

} else if(debug){

1701

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

1702

interface);

1703

}

1704

1705

/* Sleep checking until interface is running.

1706

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

1707

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

1708

if(interface_is_running(interface)){

1709

break;

1710

}

1711

struct timespec sleeptime = { .tv_nsec = 250000000 };

1712

ret = nanosleep(&sleeptime, NULL);

1713

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

1714

perror_plus("nanosleep");

1715

}

1716

}

1717

1718

errno = old_errno;

1719

return 0;

1720

}

1721

1722

error_t take_down_interface(const char *const interface){

1723

int sd = -1;

1724

error_t old_errno = errno;

1725

error_t ret_errno = 0;

1726

int ret, ret_setflags;

1727

struct ifreq network;

1728

unsigned int if_index = if_nametoindex(interface);

1729

if(if_index == 0){

1730

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

1731

errno = old_errno;

1732

return ENXIO;

1733

}

1734

if(interface_is_up(interface)){

1735

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

1736

ret_errno = errno;

1737

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

1738

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

1739

return ret_errno;

1740

}

1741

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

1742

1743

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1744

if(sd < 0){

1745

ret_errno = errno;

1746

perror_plus("socket");

1747

errno = old_errno;

1748

return ret_errno;

1749

}

1750

1751

if(debug){

1752

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

1753

interface);

1754

}

1755

1756

/* Raise priviliges */

1757

raise_privileges();

1758

1759

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

1760

ret_errno = errno;

1761

1762

/* Lower privileges */

1763

lower_privileges();

1764

1765

/* Close the socket */

1766

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

1767

if(ret == -1){

1768

perror_plus("close");

1769

}

1770

1771

if(ret_setflags == -1){

1772

errno = ret_errno;

1773

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1774

errno = old_errno;

1775

return ret_errno;

1776

}

1777

} else if(debug){

1778

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

1779

interface);

1780

}

1781

1782

errno = old_errno;

1783

return 0;

1784

}

1785

1416

1786

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

1787

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

1788

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

1789

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

1790

.interfaces = NULL, .interfaces_size = 0 };

1417

1791

AvahiSServiceBrowser *sb = NULL;

1418

int error;

1792

error_t ret_errno;

1419

1793

int ret;

1420

1794

intmax_t tmpmax;

1421

1795

char *tmp;

1422

1796

int exitcode = EXIT_SUCCESS;

1423

const char *interface = "";

1424

struct ifreq network;

1425

int sd = -1;

1426

bool take_down_interface = false;

1427

uid_t uid;

1428

gid_t gid;

1797

char *interfaces_to_take_down = NULL;

1798

size_t interfaces_to_take_down_size = 0;

1429

1799

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

1430

1800

bool tempdir_created = false;

1431

1801

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1432

1802

const char *seckey = PATHDIR "/" SECKEY;

1433

1803

const char *pubkey = PATHDIR "/" PUBKEY;

1804

char *interfaces_hooks = NULL;

1805

size_t interfaces_hooks_size = 0;

1434

1806

1435

1807

bool gnutls_initialized = false;

1436

1808

bool gpgme_initialized = false;

1498

1870

.group = 2 },

1499

1871

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

1500

1872

.arg = "SECONDS",

1501

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

1873

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

1874

.group = 2 },

1875

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

1876

.arg = "DIR",

1877

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

1502

1878

.group = 2 },

1503

1879

/*

1504

1880

* These reproduce what we would get without ARGP_NO_HELP

1523

1899

connect_to = arg;

1524

1900

break;

1525

1901

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

1526

interface = arg;

1902

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

1903

arg, (int)',');

1904

if(ret_errno != 0){

1905

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

1906

}

1527

1907

break;

1528

1908

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

1529

1909

seckey = arg;

1558

1938

argp_error(state, "Bad retry interval");

1559

1939

}

1560

1940

break;

1941

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

1942

hookdir = arg;

1943

break;

1561

1944

/*

1562

1945

* These reproduce what we would get without ARGP_NO_HELP

1563

1946

*/

1569

1952

argp_state_help(state, state->out_stream,

1570

1953

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1571

1954

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

1572

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

1955

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

1573

1956

exit(argp_err_exit_status);

1574

1957

break;

1575

1958

default:

1602

1985

{

1603

1986

/* Work around Debian bug #633582:

1604

1987

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

1605

struct stat st;

1606

1988

1607

1989

/* Re-raise priviliges */

1608

errno = 0;

1609

ret = seteuid(0);

1610

if(ret == -1){

1611

perror_plus("seteuid");

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

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

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

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

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

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

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

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

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

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

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1659

}

1660

}

1661

1662

/* Find network hooks and run them */

1663

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

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

1667

alphasort);

1668

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

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

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

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

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

1686

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

1687

/* setenv( XXX more here */

1688

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

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

1990

if(raise_privileges() == 0){

1991

struct stat st;

1992

1993

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

1994

int seckey_fd = open(seckey, O_RDONLY);

1995

if(seckey_fd == -1){

1996

perror_plus("open");

1997

} else {

1998

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

1999

if(ret == -1){

2000

perror_plus("fstat");

2001

} else {

2002

if(S_ISREG(st.st_mode)

2003

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

2004

ret = fchown(seckey_fd, uid, gid);

2005

if(ret == -1){

2006

perror_plus("fchown");

2007

}

2008

}

2009

}

2010

TEMP_FAILURE_RETRY(close(seckey_fd));

2011

}

2012

}

2013

2014

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

2015

int pubkey_fd = open(pubkey, O_RDONLY);

2016

if(pubkey_fd == -1){

2017

perror_plus("open");

2018

} else {

2019

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

2020

if(ret == -1){

2021

perror_plus("fstat");

2022

} else {

2023

if(S_ISREG(st.st_mode)

2024

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

2025

ret = fchown(pubkey_fd, uid, gid);

2026

if(ret == -1){

2027

perror_plus("fchown");

2028

}

2029

}

2030

}

2031

TEMP_FAILURE_RETRY(close(pubkey_fd));

2032

}

2033

}

2034

2035

/* Lower privileges */

2036

lower_privileges();

2037

}

2038

}

2039

2040

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

2041

{

2042

char *interface = NULL;

2043

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

2044

interface))){

2045

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

2046

and if_nametoindex(interface) == 0){

2047

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

2048

fprintf_plus(stderr, "Not using nonexisting interface"

2049

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

2050

}

2051

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

2052

interface = NULL;

2053

}

2054

}

2055

}

2056

2057

/* Run network hooks */

2058

{

2059

if(mc.interfaces != NULL){

2060

interfaces_hooks = malloc(mc.interfaces_size);

2061

if(interfaces_hooks == NULL){

2062

perror_plus("malloc");

1693

2063

goto end;

1694

2064

}

1695

}

1696

close(devnull);

2065

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

2066

interfaces_hooks_size = mc.interfaces_size;

2067

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2068

(int)',');

2069

}

2070

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

2071

interfaces_hooks : "", delay)){

2072

goto end;

2073

}

1697

2074

}

1698

2075

1699

2076

if(not debug){

1700

2077

avahi_set_log_function(empty_log);

1701

2078

}

1702

2079

1703

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

1704

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1706

alphasort);

1707

if(ret >= 1){

1708

/* Pick the first good interface */

1709

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

1710

if(debug){

1711

fprintf(stderr, "Using interface \"%s\"\n", interface);

1712

}

1713

if(interface == NULL){

1714

perror_plus("malloc");

1715

free(direntries);

1716

exitcode = EXIT_FAILURE;

1717

goto end;

1718

}

1719

free(direntries);

1720

} else {

1721

free(direntries);

1722

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

1723

exitcode = EXIT_FAILURE;

1724

goto end;

1725

}

1726

}

1727

1728

2080

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

1729

2081

from the signal handler */

1730

2082

/* Initialize the pseudo-RNG for Avahi */

1731

2083

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

1732

mc.simple_poll = avahi_simple_poll_new();

1733

if(mc.simple_poll == NULL){

1734

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

2084

simple_poll = avahi_simple_poll_new();

2085

if(simple_poll == NULL){

2086

fprintf_plus(stderr,

2087

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

1735

2088

exitcode = EX_UNAVAILABLE;

1736

2089

goto end;

1737

2090

}

1799

2152

}

1800

2153

}

1801

2154

1802

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

1803

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

1804

if_index = (AvahiIfIndex) if_nametoindex(interface);

1805

if(if_index == 0){

1806

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

1807

exitcode = EX_UNAVAILABLE;

1808

goto end;

1809

}

1810

1811

if(quit_now){

1812

goto end;

1813

}

1814

1815

/* Re-raise priviliges */

1816

errno = 0;

1817

ret = seteuid(0);

1818

if(ret == -1){

1819

perror_plus("seteuid");

1820

}

1821

1822

#ifdef __linux__

1823

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1824

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

1825

ret = klogctl(8, NULL, 5);

1826

bool restore_loglevel = true;

1827

if(ret == -1){

1828

restore_loglevel = false;

1829

perror_plus("klogctl");

1830

}

1831

#endif /* __linux__ */

1832

1833

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1834

if(sd < 0){

1835

perror_plus("socket");

1836

exitcode = EX_OSERR;

1837

#ifdef __linux__

1838

if(restore_loglevel){

1839

ret = klogctl(7, NULL, 0);

1840

if(ret == -1){

1841

perror_plus("klogctl");

1842

}

1843

}

1844

#endif /* __linux__ */

1845

/* Lower privileges */

1846

errno = 0;

1847

ret = seteuid(uid);

1848

if(ret == -1){

1849

perror_plus("seteuid");

1850

}

1851

goto end;

1852

}

1853

strcpy(network.ifr_name, interface);

1854

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

1855

if(ret == -1){

1856

perror_plus("ioctl SIOCGIFFLAGS");

1857

#ifdef __linux__

1858

if(restore_loglevel){

1859

ret = klogctl(7, NULL, 0);

1860

if(ret == -1){

1861

perror_plus("klogctl");

1862

}

1863

}

1864

#endif /* __linux__ */

1865

exitcode = EX_OSERR;

1866

/* Lower privileges */

1867

errno = 0;

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

goto end;

1873

}

1874

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

1875

network.ifr_flags |= IFF_UP;

1876

take_down_interface = true;

1877

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

1878

if(ret == -1){

1879

take_down_interface = false;

1880

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1881

exitcode = EX_OSERR;

1882

#ifdef __linux__

1883

if(restore_loglevel){

1884

ret = klogctl(7, NULL, 0);

1885

if(ret == -1){

1886

perror_plus("klogctl");

2155

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

2156

if(mc.interfaces == NULL){

2157

struct dirent **direntries;

2158

/* Look for any good interfaces */

2159

ret = scandir(sys_class_net, &direntries, good_interface,

2160

alphasort);

2161

if(ret >= 1){

2162

/* Add all found interfaces to interfaces list */

2163

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

2164

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

2165

direntries[i]->d_name);

2166

if(ret_errno != 0){

2167

perror_plus("argz_add");

2168

continue;

2169

}

2170

if(debug){

2171

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

2172

direntries[i]->d_name);

2173

}

2174

}

2175

free(direntries);

2176

} else {

2177

free(direntries);

2178

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

2179

exitcode = EXIT_FAILURE;

2180

goto end;

2181

}

2182

}

2183

2184

/* Bring up interfaces which are down */

2185

{

2186

char *interface = NULL;

2187

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

2188

interface))){

2189

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

2190

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

2191

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

2192

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

2193

interface);

2194

interface = NULL;

2195

while((interface = argz_next(mc.interfaces,

2196

mc.interfaces_size, interface))){

2197

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

2198

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

2199

interface);

2200

interface = NULL;

1887

2201

}

1888

2202

}

1889

#endif /* __linux__ */

1890

/* Lower privileges */

1891

errno = 0;

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

goto end;

1897

}

1898

}

1899

/* Sleep checking until interface is running.

1900

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

1901

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

1902

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

1903

if(ret == -1){

1904

perror_plus("ioctl SIOCGIFFLAGS");

1905

} else if(network.ifr_flags & IFF_RUNNING){

1906

2203

break;

1907

2204

}

1908

struct timespec sleeptime = { .tv_nsec = 250000000 };

1909

ret = nanosleep(&sleeptime, NULL);

1910

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

1911

perror_plus("nanosleep");

1912

}

1913

}

1914

if(not take_down_interface){

1915

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

1916

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

1917

if(ret == -1){

1918

perror_plus("close");

1919

}

1920

}

1921

#ifdef __linux__

1922

if(restore_loglevel){

1923

/* Restores kernel loglevel to default */

1924

ret = klogctl(7, NULL, 0);

1925

if(ret == -1){

1926

perror_plus("klogctl");

1927

}

1928

}

1929

#endif /* __linux__ */

1930

/* Lower privileges */

1931

errno = 0;

1932

if(take_down_interface){

1933

/* Lower privileges */

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

} else {

1939

/* Lower privileges permanently */

1940

ret = setuid(uid);

1941

if(ret == -1){

1942

perror_plus("setuid");

1943

}

1944

}

2205

bool interface_was_up = interface_is_up(interface);

2206

ret = bring_up_interface(interface, delay);

2207

if(not interface_was_up){

2208

if(ret != 0){

2209

errno = ret;

2210

perror_plus("Failed to bring up interface");

2211

} else {

2212

ret_errno = argz_add(&interfaces_to_take_down,

2213

&interfaces_to_take_down_size,

2214

interface);

2215

}

2216

}

2217

}

2218

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

2219

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

2220

}

2221

}

2222

2223

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

2224

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

2225

if(debug){

2226

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

2227

mc.interfaces);

2228

}

2229

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

1945

2230

}

1946

2231

1947

2232

if(quit_now){

1948

2233

goto end;

1949

2234

}

1950

2235

1951

ret = init_gnutls_global(pubkey, seckey);

2236

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

1952

2237

if(ret == -1){

1953

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

2238

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

1954

2239

exitcode = EX_UNAVAILABLE;

1955

2240

goto end;

1956

2241

} else {

1971

2256

goto end;

1972

2257

}

1973

2258

1974

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

1975

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

2259

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

2260

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

1976

2261

exitcode = EX_UNAVAILABLE;

1977

2262

goto end;

1978

2263

} else {

1987

2272

/* Connect directly, do not use Zeroconf */

1988

2273

/* (Mainly meant for debugging) */

1989

2274

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

2275

1990

2276

if(address == NULL){

1991

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

2277

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

1992

2278

exitcode = EX_USAGE;

1993

2279

goto end;

1994

2280

}

1997

2283

goto end;

1998

2284

}

1999

2285

2000

uint16_t port;

2286

in_port_t port;

2001

2287

errno = 0;

2002

2288

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

2003

2289

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

2004

or tmpmax != (uint16_t)tmpmax){

2005

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

2290

or tmpmax != (in_port_t)tmpmax){

2291

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

2006

2292

exitcode = EX_USAGE;

2007

2293

goto end;

2008

2294

}

2009

2295

2010

2296

if(quit_now){

2011

2297

goto end;

2012

2298

}

2013

2299

2014

port = (uint16_t)tmpmax;

2300

port = (in_port_t)tmpmax;

2015

2301

*address = '\0';

2016

2302

/* Colon in address indicates IPv6 */

2017

2303

int af;

2033

2319

}

2034

2320

2035

2321

while(not quit_now){

2036

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

2322

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

2323

&mc);

2037

2324

if(quit_now or ret == 0){

2038

2325

break;

2039

2326

}

2040

2327

if(debug){

2041

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

2042

(int)retry_interval);

2328

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

2329

(int)retry_interval);

2043

2330

}

2044

2331

sleep((int)retry_interval);

2045

2332

}

2065

2352

config.publish_domain = 0;

2066

2353

2067

2354

/* Allocate a new server */

2068

mc.server = avahi_server_new(avahi_simple_poll_get

2069

(mc.simple_poll), &config, NULL,

2070

NULL, &error);

2355

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2356

&config, NULL, NULL, &ret_errno);

2071

2357

2072

2358

/* Free the Avahi configuration data */

2073

2359

avahi_server_config_free(&config);

2075

2361

2076

2362

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

2077

2363

if(mc.server == NULL){

2078

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

2079

avahi_strerror(error));

2364

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

2365

avahi_strerror(ret_errno));

2080

2366

exitcode = EX_UNAVAILABLE;

2081

2367

goto end;

2082

2368

}

2088

2374

/* Create the Avahi service browser */

2089

2375

sb = avahi_s_service_browser_new(mc.server, if_index,

2090

2376

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2091

NULL, 0, browse_callback, NULL);

2377

NULL, 0, browse_callback,

2378

(void *)&mc);

2092

2379

if(sb == NULL){

2093

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

2094

avahi_strerror(avahi_server_errno(mc.server)));

2380

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

2381

avahi_strerror(avahi_server_errno(mc.server)));

2095

2382

exitcode = EX_UNAVAILABLE;

2096

2383

goto end;

2097

2384

}

2103

2390

/* Run the main loop */

2104

2391

2105

2392

if(debug){

2106

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

2393

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

2107

2394

}

2108

2395

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

(int)(retry_interval * 1000));

2396

ret = avahi_loop_with_timeout(simple_poll,

2397

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

2111

2398

if(debug){

2112

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

2113

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

2399

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

2400

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

2114

2401

}

2115

2402

2116

2403

end:

2117

2404

2118

2405

if(debug){

2119

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

2406

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

2120

2407

}

2121

2408

2122

2409

/* Cleanup things */

2410

free(mc.interfaces);

2411

2123

2412

if(sb != NULL)

2124

2413

avahi_s_service_browser_free(sb);

2125

2414

2126

2415

if(mc.server != NULL)

2127

2416

avahi_server_free(mc.server);

2128

2417

2129

if(mc.simple_poll != NULL)

2130

avahi_simple_poll_free(mc.simple_poll);

2418

if(simple_poll != NULL)

2419

avahi_simple_poll_free(simple_poll);

2131

2420

2132

2421

if(gnutls_initialized){

2133

2422

gnutls_certificate_free_credentials(mc.cred);

2138

2427

if(gpgme_initialized){

2139

2428

gpgme_release(mc.ctx);

2140

2429

}

2141

2430

2142

2431

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

2143

2432

has seen */

2144

2433

if(mc.current_server != NULL){

2150

2439

}

2151

2440

}

2152

2441

2153

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

2154

2155

/* Take down the network interface */

2156

if(take_down_interface){

2157

/* Re-raise priviliges */

2158

errno = 0;

2159

ret = seteuid(0);

2160

if(ret == -1){

2161

perror_plus("seteuid");

2162

}

2163

if(geteuid() == 0){

2164

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

2165

if(ret == -1){

2166

perror_plus("ioctl SIOCGIFFLAGS");

2167

} else if(network.ifr_flags & IFF_UP) {

2168

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

2169

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

2170

if(ret == -1){

2171

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2442

/* Re-raise priviliges */

2443

{

2444

raise_privileges();

2445

2446

/* Run network hooks */

2447

run_network_hooks("stop", interfaces_hooks != NULL ?

2448

interfaces_hooks : "", delay);

2449

2450

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

2451

{

2452

char *interface = NULL;

2453

while((interface=argz_next(interfaces_to_take_down,

2454

interfaces_to_take_down_size,

2455

interface))){

2456

ret_errno = take_down_interface(interface);

2457

if(ret_errno != 0){

2458

errno = ret_errno;

2459

perror_plus("Failed to take down interface");

2172

2460

}

2173

2461

}

2174

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

2175

if(ret == -1){

2176

perror_plus("close");

2177

}

2178

/* Lower privileges permanently */

2179

errno = 0;

2180

ret = setuid(uid);

2181

if(ret == -1){

2182

perror_plus("setuid");

2462

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

2463

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

2464

" down\n");

2183

2465

}

2184

2466

}

2467

2468

lower_privileges_permanently();

2185

2469

}

2186

2470

2471

free(interfaces_to_take_down);

2472

free(interfaces_hooks);

2473

2187

2474

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

2188

2475

if(tempdir_created){

2189

2476

struct dirent **direntries = NULL;

2202

2489

}

2203

2490

ret = remove(fullname);

2204

2491

if(ret == -1){

2205

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

2206

strerror(errno));

2492

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

2493

strerror(errno));

2207

2494

}

2208

2495

free(fullname);

2209

2496

}