/mandos/trunk : revision 505.3.2

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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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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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109

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 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, "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, "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, "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, "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, "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, "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, "bad gpgme_new: %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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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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331

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, "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){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

365

345

return -1;

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346

}

367

347

368

348

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

369

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rc = gpgme_data_new(&dh_plain);

370

350

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));

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

374

353

gpgme_data_release(dh_crypto);

375

354

return -1;

376

355

}

377

356

378

357

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

379

358

data buffer */

380

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

359

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

381

360

if(rc != GPG_ERR_NO_ERROR){

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

384

363

plaintext_length = -1;

385

364

if(debug){

386

365

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

366

result = gpgme_op_decrypt_result(mc.ctx);

388

367

if(result == NULL){

389

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

368

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

390

369

} 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);

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

395

374

if(result->file_name != NULL){

396

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

375

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

397

376

}

398

377

gpgme_recipient_t recipient;

399

378

recipient = result->recipients;

400

379

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");

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

408

386

recipient = recipient->next;

409

387

}

410

388

}

413

391

}

414

392

415

393

if(debug){

416

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

394

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

417

395

}

418

396

419

397

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

426

404

*plaintext = NULL;

427

405

while(true){

428

406

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

407

(size_t)plaintext_length,

408

plaintext_capacity);

431

409

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

435

413

}

436

414

437

415

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

428

}

451

429

452

430

if(debug){

453

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

431

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

454

432

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

455

433

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

456

434

}

468

446

}

469

447

470

448

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

449

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

450

-Wunreachable-code */

472

451

if(ret == NULL)

473

452

ret = "(unknown)";

474

453

return ret;

477

456

/* GnuTLS log function callback */

478

457

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

479

458

const char* string){

480

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

459

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

481

460

}

482

461

483

462

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

463

const char *seckeyfilename){

486

464

int ret;

487

465

488

466

if(debug){

489

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

467

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

490

468

}

491

469

492

470

ret = gnutls_global_init();

493

471

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

472

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

473

safer_gnutls_strerror(ret));

496

474

return -1;

497

475

}

498

476

505

483

}

506

484

507

485

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

487

if(ret != GNUTLS_E_SUCCESS){

510

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

511

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

512

490

gnutls_global_deinit();

513

491

return -1;

514

492

}

515

493

516

494

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);

495

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

496

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

497

seckeyfilename);

521

498

}

522

499

523

500

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

501

(mc.cred, pubkeyfilename, seckeyfilename,

525

502

GNUTLS_OPENPGP_FMT_BASE64);

526

503

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));

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

532

509

goto globalfail;

533

510

}

534

511

535

512

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

513

ret = gnutls_dh_params_init(&mc.dh_params);

537

514

if(ret != GNUTLS_E_SUCCESS){

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

515

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

516

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

541

517

goto globalfail;

542

518

}

543

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

519

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

544

520

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

521

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

522

safer_gnutls_strerror(ret));

547

523

goto globalfail;

548

524

}

549

525

550

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

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

527

552

528

return 0;

553

529

554

530

globalfail:

555

531

556

gnutls_certificate_free_credentials(mc->cred);

532

gnutls_certificate_free_credentials(mc.cred);

557

533

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

534

gnutls_dh_params_deinit(mc.dh_params);

559

535

return -1;

560

536

}

561

537

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

538

static int init_gnutls_session(gnutls_session_t *session){

564

539

int ret;

565

540

/* GnuTLS session creation */

566

541

do {

570

545

}

571

546

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

572

547

if(ret != GNUTLS_E_SUCCESS){

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

548

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

549

safer_gnutls_strerror(ret));

576

550

}

577

551

578

552

{

579

553

const char *err;

580

554

do {

581

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

555

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

582

556

if(quit_now){

583

557

gnutls_deinit(*session);

584

558

return -1;

585

559

}

586

560

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

587

561

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));

562

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

563

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

564

safer_gnutls_strerror(ret));

591

565

gnutls_deinit(*session);

592

566

return -1;

593

567

}

595

569

596

570

do {

597

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

572

mc.cred);

599

573

if(quit_now){

600

574

gnutls_deinit(*session);

601

575

return -1;

602

576

}

603

577

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

604

578

if(ret != GNUTLS_E_SUCCESS){

605

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

606

safer_gnutls_strerror(ret));

579

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

580

safer_gnutls_strerror(ret));

607

581

gnutls_deinit(*session);

608

582

return -1;

609

583

}

611

585

/* ignore client certificate if any. */

612

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

587

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

589

616

590

return 0;

617

591

}

621

595

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

622

596

623

597

/* Called when a Mandos server is found */

624

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

598

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

625

599

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

600

int af){

627

601

int ret, tcp_sd = -1;

628

602

ssize_t sret;

629

603

union {

654

628

pf = PF_INET;

655

629

break;

656

630

default:

657

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

631

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

658

632

errno = EINVAL;

659

633

return -1;

660

634

}

661

635

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);

636

ret = init_gnutls_session(&session);

695

637

if(ret != 0){

696

638

return -1;

697

639

}

698

640

699

641

if(debug){

700

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

701

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

642

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

643

"\n", ip, port);

702

644

}

703

645

704

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

730

672

}

731

673

if(ret == 0){

732

674

int e = errno;

733

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

675

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

734

676

errno = e;

735

677

goto mandos_end;

736

678

}

737

679

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

739

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

685

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

741

-Wunreachable-code*/

686

-Wunreachable-code*/

742

687

if(if_index == AVAHI_IF_UNSPEC){

743

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

744

" incomplete without a network interface\n");

688

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

689

" without a network interface\n");

745

690

errno = EINVAL;

746

691

goto mandos_end;

747

692

}

765

710

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

766

711

perror_plus("if_indextoname");

767

712

} else {

768

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

769

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

713

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

714

ip, interface, port);

770

715

}

771

716

} else {

772

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

773

ip, (uintmax_t)port);

717

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

718

port);

774

719

}

775

720

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

721

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

786

731

perror_plus("inet_ntop");

787

732

} else {

788

733

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

789

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

734

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

790

735

}

791

736

}

792

737

}

820

765

while(true){

821

766

size_t out_size = strlen(out);

822

767

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

823

out_size - written));

768

out_size - written));

824

769

if(ret == -1){

825

770

int e = errno;

826

771

perror_plus("write");

846

791

}

847

792

848

793

if(debug){

849

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

794

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

850

795

}

851

796

852

797

if(quit_now){

854

799

goto mandos_end;

855

800

}

856

801

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);

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

862

804

863

805

if(quit_now){

864

806

errno = EINTR;

875

817

876

818

if(ret != GNUTLS_E_SUCCESS){

877

819

if(debug){

878

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

820

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

879

821

gnutls_perror(ret);

880

822

}

881

823

errno = EPROTO;

885

827

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

886

828

887

829

if(debug){

888

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

889

" %s\n", ip);

830

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

831

ip);

890

832

}

891

833

892

834

while(true){

897

839

}

898

840

899

841

buffer_capacity = incbuffer(&buffer, buffer_length,

900

buffer_capacity);

842

buffer_capacity);

901

843

if(buffer_capacity == 0){

902

844

int e = errno;

903

845

perror_plus("incbuffer");

930

872

}

931

873

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

932

874

if(ret < 0){

933

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

934

"***\n");

875

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

935

876

gnutls_perror(ret);

936

877

errno = EPROTO;

937

878

goto mandos_end;

938

879

}

939

880

break;

940

881

default:

941

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

942

" encrypted session with Mandos server\n");

882

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

883

" encrypted session with Mandos server\n");

943

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

944

885

errno = EIO;

945

886

goto mandos_end;

950

891

}

951

892

952

893

if(debug){

953

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

894

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

954

895

}

955

896

956

897

if(quit_now){

968

909

969

910

if(buffer_length > 0){

970

911

ssize_t decrypted_buffer_size;

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

973

915

if(decrypted_buffer_size >= 0){

974

916

975

917

written = 0;

985

927

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

986

928

int e = errno;

987

929

if(debug){

988

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

989

strerror(errno));

930

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

931

strerror(errno));

990

932

}

991

933

errno = e;

992

934

goto mandos_end;

1036

978

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

979

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

980

flags,

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1043

983

1044

984

/* Called whenever a service has been resolved successfully or

1045

985

timed out */

1051

991

switch(event){

1052

992

default:

1053

993

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)));

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1059

997

break;

1060

998

1061

999

case AVAHI_RESOLVER_FOUND:

1063

1001

char ip[AVAHI_ADDRESS_STR_MAX];

1064

1002

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

1065

1003

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);

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1069

1007

}

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1074

1010

if(ret == 0){

1075

avahi_simple_poll_quit(simple_poll);

1011

avahi_simple_poll_quit(mc.simple_poll);

1076

1012

} 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

}

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1083

1015

}

1084

1016

}

1085

1017

}

1095

1027

const char *domain,

1096

1028

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1029

flags,

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1102

1032

1103

1033

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

1104

1034

is removed from the LAN */

1111

1041

default:

1112

1042

case AVAHI_BROWSER_FAILURE:

1113

1043

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);

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1118

1047

return;

1119

1048

1120

1049

case AVAHI_BROWSER_NEW:

1123

1052

the callback function is called the Avahi server will free the

1124

1053

resolver for us. */

1125

1054

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)));

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1134

1060

break;

1135

1061

1136

1062

case AVAHI_BROWSER_REMOVE:

1139

1065

case AVAHI_BROWSER_ALL_FOR_NOW:

1140

1066

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1141

1067

if(debug){

1142

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

1143

" searching...\n");

1068

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

1144

1069

}

1145

1070

break;

1146

1071

}

1155

1080

signal_received = sig;

1156

1081

int old_errno = errno;

1157

1082

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1160

1085

}

1161

1086

errno = old_errno;

1162

1087

}

1163

1088

1164

1089

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

1165

1090

int ret;

1166

error_t ret_errno;

1167

1091

1168

1092

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

1169

1093

if(s < 0){

1170

ret_errno = errno;

1171

1094

perror_plus("socket");

1172

errno = ret_errno;

1173

1095

return false;

1174

1096

}

1175

1097

strcpy(ifr->ifr_name, ifname);

1176

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1099

if(ret == -1){

1178

1100

if(debug){

1179

ret_errno = errno;

1180

1101

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

1102

}

1183

1103

return false;

1184

1104

}

1190

1110

/* Reject the loopback device */

1191

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1192

1112

if(debug){

1193

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

1194

ifname);

1113

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

1114

ifname);

1195

1115

}

1196

1116

return false;

1197

1117

}

1198

1118

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

1199

1119

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

1200

1120

if(debug){

1201

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

1202

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

1121

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

1122

ifname);

1203

1123

}

1204

1124

return true;

1205

1125

}

1206

1126

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

1207

1127

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

1208

1128

if(debug){

1209

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1210

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

1129

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

1130

ifname);

1211

1131

}

1212

1132

return false;

1213

1133

}

1214

1134

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

1215

1135

if(ifr->ifr_flags & IFF_NOARP){

1216

1136

if(debug){

1217

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

1218

ifname);

1137

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

1219

1138

}

1220

1139

return false;

1221

1140

}

1222

1141

1223

1142

/* Accept this device */

1224

1143

if(debug){

1225

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

1144

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

1226

1145

}

1227

1146

return true;

1228

1147

}

1240

1159

struct ifreq ifr;

1241

1160

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

1242

1161

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);

1162

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

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1285

1215

}

1286

1216

1287

1217

int notdotentries(const struct dirent *direntry){

1298

1228

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

1299

1229

int runnable_hook(const struct dirent *direntry){

1300

1230

int ret;

1301

size_t sret;

1302

1231

struct stat st;

1303

1232

1304

1233

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

1306

1235

return 0;

1307

1236

}

1308

1237

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);

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

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

1330

1255

if(ret == -1){

1331

1256

if(debug){

1332

perror_plus("Could not stat hook");

1257

perror_plus("Could not stat plugin");

1333

1258

}

1334

1259

return 0;

1335

1260

}

1336

1261

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

1337

1262

/* Not a regular file */

1338

if(debug){

1339

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

1340

direntry->d_name);

1341

}

1342

1263

return 0;

1343

1264

}

1344

1265

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

1345

1266

/* Not executable */

1346

if(debug){

1347

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

1348

direntry->d_name);

1349

}

1350

1267

return 0;

1351

1268

}

1352

if(debug){

1353

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

1354

direntry->d_name);

1355

}

1356

1269

return 1;

1357

1270

}

1358

1271

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1361

1273

int ret;

1362

1274

struct timespec now;

1363

1275

struct timespec waited_time;

1364

1276

intmax_t block_time;

1365

1277

1366

1278

while(true){

1367

if(mc->current_server == NULL){

1279

if(mc.current_server == NULL){

1368

1280

if (debug){

1369

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

1370

" No timeout!\n");

1281

fprintf(stderr,

1282

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

1371

1283

}

1372

1284

ret = avahi_simple_poll_iterate(s, -1);

1373

1285

} else {

1374

1286

if (debug){

1375

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

1376

" it, or wait\n");

1287

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

1288

" or wait\n");

1377

1289

}

1378

1290

/* the current time */

1379

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1384

1296

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

1385

1297

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

1386

1298

waited_time.tv_sec = (now.tv_sec

1387

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

1299

- mc.current_server->last_seen.tv_sec);

1388

1300

waited_time.tv_nsec = (now.tv_nsec

1389

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

1301

- mc.current_server->last_seen.tv_nsec);

1390

1302

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

1391

1303

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

1392

1304

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

1395

1307

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

1396

1308

1397

1309

if (debug){

1398

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

1399

block_time);

1310

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

1400

1311

}

1401

1312

1402

1313

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);

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1407

1318

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1319

avahi_simple_poll_quit(mc.simple_poll);

1409

1320

return 0;

1410

1321

}

1411

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1323

&mc.current_server->last_seen);

1413

1324

if(ret == -1){

1414

1325

perror_plus("clock_gettime");

1415

1326

return -1;

1416

1327

}

1417

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

1328

mc.current_server = mc.current_server->next;

1418

1329

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

1419

1330

servers, but don't block */

1420

1331

}

1422

1333

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

1423

1334

}

1424

1335

if(ret != 0){

1425

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

1336

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

1426

1337

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

1427

1338

}

1428

1339

}

1429

1340

}

1430

1341

}

1431

1342

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

1343

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

1344

AvahiSServiceBrowser *sb = NULL;

1795

error_t ret_errno;

1345

int error;

1796

1346

int ret;

1797

1347

intmax_t tmpmax;

1798

1348

char *tmp;

1799

1349

int exitcode = EXIT_SUCCESS;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1802

1356

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

1803

1357

bool tempdir_created = false;

1804

1358

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1359

const char *seckey = PATHDIR "/" SECKEY;

1806

1360

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1361

1810

1362

bool gnutls_initialized = false;

1811

1363

bool gpgme_initialized = false;

1873

1425

.group = 2 },

1874

1426

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

1875

1427

.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",

1428

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

1881

1429

.group = 2 },

1882

1430

/*

1883

1431

* These reproduce what we would get without ARGP_NO_HELP

1902

1450

connect_to = arg;

1903

1451

break;

1904

1452

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

}

1453

interface = arg;

1910

1454

break;

1911

1455

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

1912

1456

seckey = arg;

1941

1485

argp_error(state, "Bad retry interval");

1942

1486

}

1943

1487

break;

1944

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

1945

hookdir = arg;

1946

break;

1947

1488

/*

1948

1489

* These reproduce what we would get without ARGP_NO_HELP

1949

1490

*/

1955

1496

argp_state_help(state, state->out_stream,

1956

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1957

1498

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

1958

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

1499

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

1959

1500

exit(argp_err_exit_status);

1960

1501

break;

1961

1502

default:

1988

1529

{

1989

1530

/* Work around Debian bug #633582:

1990

1531

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

1532

struct stat st;

1991

1533

1992

1534

/* 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");

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

2066

1644

goto end;

2067

1645

}

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;

2076

}

1646

}

1647

close(devnull);

2077

1648

}

2078

1649

2079

1650

if(not debug){

2080

1651

avahi_set_log_function(empty_log);

2081

1652

}

2082

1653

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

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

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

2083

1686

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

2084

1687

from the signal handler */

2085

1688

/* Initialize the pseudo-RNG for Avahi */

2086

1689

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");

1690

mc.simple_poll = avahi_simple_poll_new();

1691

if(mc.simple_poll == NULL){

1692

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

2091

1693

exitcode = EX_UNAVAILABLE;

2092

1694

goto end;

2093

1695

}

2155

1757

}

2156

1758

}

2157

1759

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;

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

2204

1845

}

2205

1846

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

2206

1864

break;

2207

1865

}

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);

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

2233

1903

}

2234

1904

2235

1905

if(quit_now){

2236

1906

goto end;

2237

1907

}

2238

1908

2239

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

1909

ret = init_gnutls_global(pubkey, seckey);

2240

1910

if(ret == -1){

2241

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

1911

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

2242

1912

exitcode = EX_UNAVAILABLE;

2243

1913

goto end;

2244

1914

} else {

2259

1929

goto end;

2260

1930

}

2261

1931

2262

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

2263

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

1932

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

1933

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

2264

1934

exitcode = EX_UNAVAILABLE;

2265

1935

goto end;

2266

1936

} else {

2275

1945

/* Connect directly, do not use Zeroconf */

2276

1946

/* (Mainly meant for debugging) */

2277

1947

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

2278

2279

1948

if(address == NULL){

2280

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

1949

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

2281

1950

exitcode = EX_USAGE;

2282

1951

goto end;

2283

1952

}

2286

1955

goto end;

2287

1956

}

2288

1957

2289

in_port_t port;

1958

uint16_t port;

2290

1959

errno = 0;

2291

1960

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

2292

1961

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");

1962

or tmpmax != (uint16_t)tmpmax){

1963

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

2295

1964

exitcode = EX_USAGE;

2296

1965

goto end;

2297

1966

}

2298

1967

2299

1968

if(quit_now){

2300

1969

goto end;

2301

1970

}

2302

1971

2303

port = (in_port_t)tmpmax;

1972

port = (uint16_t)tmpmax;

2304

1973

*address = '\0';

2305

1974

/* Colon in address indicates IPv6 */

2306

1975

int af;

2322

1991

}

2323

1992

2324

1993

while(not quit_now){

2325

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

2326

&mc);

1994

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

2327

1995

if(quit_now or ret == 0){

2328

1996

break;

2329

1997

}

2330

1998

if(debug){

2331

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

2332

(int)retry_interval);

1999

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

2000

(int)retry_interval);

2333

2001

}

2334

2002

sleep((int)retry_interval);

2335

2003

}

2355

2023

config.publish_domain = 0;

2356

2024

2357

2025

/* Allocate a new server */

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2026

mc.server = avahi_server_new(avahi_simple_poll_get

2027

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2360

2029

2361

2030

/* Free the Avahi configuration data */

2362

2031

avahi_server_config_free(&config);

2364

2033

2365

2034

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

2366

2035

if(mc.server == NULL){

2367

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

2368

avahi_strerror(ret_errno));

2036

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

2037

avahi_strerror(error));

2369

2038

exitcode = EX_UNAVAILABLE;

2370

2039

goto end;

2371

2040

}

2377

2046

/* Create the Avahi service browser */

2378

2047

sb = avahi_s_service_browser_new(mc.server, if_index,

2379

2048

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2049

NULL, 0, browse_callback, NULL);

2382

2050

if(sb == NULL){

2383

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

2384

avahi_strerror(avahi_server_errno(mc.server)));

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2385

2053

exitcode = EX_UNAVAILABLE;

2386

2054

goto end;

2387

2055

}

2393

2061

/* Run the main loop */

2394

2062

2395

2063

if(debug){

2396

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

2064

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

2397

2065

}

2398

2066

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2401

2069

if(debug){

2402

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

2403

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

2070

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

2071

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

2404

2072

}

2405

2073

2406

2074

end:

2407

2075

2408

2076

if(debug){

2409

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

2077

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

2410

2078

}

2411

2079

2412

2080

/* Cleanup things */

2413

free(mc.interfaces);

2414

2415

2081

if(sb != NULL)

2416

2082

avahi_s_service_browser_free(sb);

2417

2083

2418

2084

if(mc.server != NULL)

2419

2085

avahi_server_free(mc.server);

2420

2086

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2087

if(mc.simple_poll != NULL)

2088

avahi_simple_poll_free(mc.simple_poll);

2423

2089

2424

2090

if(gnutls_initialized){

2425

2091

gnutls_certificate_free_credentials(mc.cred);

2430

2096

if(gpgme_initialized){

2431

2097

gpgme_release(mc.ctx);

2432

2098

}

2433

2099

2434

2100

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

2435

2101

has seen */

2436

2102

if(mc.current_server != NULL){

2442

2108

}

2443

2109

}

2444

2110

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");

2111

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

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2120

}

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2463

2130

}

2464

2131

}

2465

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

2466

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

2467

" down\n");

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2468

2141

}

2469

2142

}

2470

2471

lower_privileges_permanently();

2472

2143

}

2473

2144

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2476

2477

2145

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

2478

2146

if(tempdir_created){

2479

2147

struct dirent **direntries = NULL;

2492

2160

}

2493

2161

ret = remove(fullname);

2494

2162

if(ret == -1){

2495

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

2496

strerror(errno));

2163

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

2164

strerror(errno));

2497

2165

}

2498

2166

free(fullname);

2499

2167

}