/mandos/trunk : revision 652

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

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*

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* Everything else is

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*

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

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause() */

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

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

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

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

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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: ",

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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}

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

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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

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int af, server **current_server){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

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return false;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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*current_server = new_server;

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

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} else {

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new_server->next = mc.current_server;

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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(*current_server)->prev = new_server;

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}

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

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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return false;

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}

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return 0;

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return true;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "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){

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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));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

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}

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

349

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rc = gpgme_data_new(&dh_plain);

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if(rc != GPG_ERR_NO_ERROR){

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

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

372

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_data_release(dh_crypto);

354

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return -1;

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376

}

356

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

358

379

data buffer */

359

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

380

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

360

381

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

363

384

plaintext_length = -1;

364

385

if(debug){

365

386

gpgme_decrypt_result_t result;

366

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

367

388

if(result == NULL){

368

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

389

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

369

390

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

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);

374

395

if(result->file_name != NULL){

375

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

396

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

376

397

}

377

398

gpgme_recipient_t recipient;

378

399

recipient = result->recipients;

379

400

while(recipient != NULL){

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");

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");

386

408

recipient = recipient->next;

387

409

}

388

410

}

391

413

}

392

414

393

415

if(debug){

394

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

416

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

395

417

}

396

418

397

419

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

404

426

*plaintext = NULL;

405

427

while(true){

406

428

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

409

431

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

413

435

}

414

436

415

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

450

}

429

451

430

452

if(debug){

431

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

453

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

432

454

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

433

455

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

434

456

}

446

468

}

447

469

448

470

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

451

472

if(ret == NULL)

452

473

ret = "(unknown)";

453

474

return ret;

456

477

/* GnuTLS log function callback */

457

478

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

458

479

const char* string){

459

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

480

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

460

481

}

461

482

462

483

static int init_gnutls_global(const char *pubkeyfilename,

463

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

464

486

int ret;

465

487

466

488

if(debug){

467

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

489

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

468

490

}

469

491

470

492

ret = gnutls_global_init();

471

493

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

494

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

495

safer_gnutls_strerror(ret));

474

496

return -1;

475

497

}

476

498

483

505

}

484

506

485

507

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

487

509

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

510

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

511

safer_gnutls_strerror(ret));

490

512

gnutls_global_deinit();

491

513

return -1;

492

514

}

493

515

494

516

if(debug){

495

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

496

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

497

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);

498

521

}

499

522

500

523

ret = gnutls_certificate_set_openpgp_key_file

501

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

502

525

GNUTLS_OPENPGP_FMT_BASE64);

503

526

if(ret != GNUTLS_E_SUCCESS){

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));

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));

509

532

goto globalfail;

510

533

}

511

534

512

535

/* GnuTLS server initialization */

513

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

514

537

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

517

541

goto globalfail;

518

542

}

519

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

543

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

520

544

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

523

547

goto globalfail;

524

548

}

525

549

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

527

551

528

552

return 0;

529

553

530

554

globalfail:

531

555

532

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

533

557

gnutls_global_deinit();

534

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

535

559

return -1;

536

560

}

537

561

538

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

539

564

int ret;

540

565

/* GnuTLS session creation */

541

566

do {

545

570

}

546

571

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

547

572

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

550

576

}

551

577

552

578

{

553

579

const char *err;

554

580

do {

555

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

581

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

556

582

if(quit_now){

557

583

gnutls_deinit(*session);

558

584

return -1;

559

585

}

560

586

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

561

587

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

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));

565

591

gnutls_deinit(*session);

566

592

return -1;

567

593

}

569

595

570

596

do {

571

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

598

mc->cred);

573

599

if(quit_now){

574

600

gnutls_deinit(*session);

575

601

return -1;

576

602

}

577

603

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

578

604

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

581

607

gnutls_deinit(*session);

582

608

return -1;

583

609

}

585

611

/* ignore client certificate if any. */

586

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

587

613

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

589

615

590

616

return 0;

591

617

}

595

621

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

596

622

597

623

/* Called when a Mandos server is found */

598

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

624

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

599

625

AvahiIfIndex if_index,

600

int af){

626

int af, mandos_context *mc){

601

627

int ret, tcp_sd = -1;

602

628

ssize_t sret;

603

629

union {

628

654

pf = PF_INET;

629

655

break;

630

656

default:

631

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

657

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

632

658

errno = EINVAL;

633

659

return -1;

634

660

}

635

661

636

ret = init_gnutls_session(&session);

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

637

695

if(ret != 0){

638

696

return -1;

639

697

}

640

698

641

699

if(debug){

642

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

643

"\n", ip, port);

700

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

701

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

644

702

}

645

703

646

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

672

730

}

673

731

if(ret == 0){

674

732

int e = errno;

675

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

733

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

676

734

errno = e;

677

735

goto mandos_end;

678

736

}

679

737

if(af == AF_INET6){

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

684

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

687

748

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

749

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

750

" incomplete without a network interface\n");

690

751

errno = EINVAL;

691

752

goto mandos_end;

692

753

}

694

755

to.in6.sin6_scope_id = (uint32_t)if_index;

695

756

}

696

757

} else {

697

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

698

-Wconversion and

699

-Wunreachable-code */

758

to.in.sin_port = htons(port);

700

759

}

701

760

702

761

if(quit_now){

710

769

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

711

770

perror_plus("if_indextoname");

712

771

} else {

713

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

714

ip, interface, port);

772

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

773

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

715

774

}

716

775

} else {

717

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

718

port);

776

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

777

ip, (uintmax_t)port);

719

778

}

720

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

731

790

perror_plus("inet_ntop");

732

791

} else {

733

792

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

734

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

793

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

735

794

}

736

795

}

737

796

}

765

824

while(true){

766

825

size_t out_size = strlen(out);

767

826

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

768

out_size - written));

827

out_size - written));

769

828

if(ret == -1){

770

829

int e = errno;

771

830

perror_plus("write");

791

850

}

792

851

793

852

if(debug){

794

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

853

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

795

854

}

796

855

797

856

if(quit_now){

799

858

goto mandos_end;

800

859

}

801

860

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

861

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

862

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

863

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

864

gnutls_transport_set_ptr(session,

865

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

866

805

867

if(quit_now){

806

868

errno = EINTR;

817

879

818

880

if(ret != GNUTLS_E_SUCCESS){

819

881

if(debug){

820

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

882

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

821

883

gnutls_perror(ret);

822

884

}

823

885

errno = EPROTO;

827

889

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

828

890

829

891

if(debug){

830

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

831

ip);

892

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

893

" %s\n", ip);

832

894

}

833

895

834

896

while(true){

839

901

}

840

902

841

903

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

904

buffer_capacity);

843

905

if(buffer_capacity == 0){

844

906

int e = errno;

845

907

perror_plus("incbuffer");

872

934

}

873

935

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

874

936

if(ret < 0){

875

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

937

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

938

"***\n");

876

939

gnutls_perror(ret);

877

940

errno = EPROTO;

878

941

goto mandos_end;

879

942

}

880

943

break;

881

944

default:

882

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

883

" encrypted session with Mandos server\n");

945

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

946

" encrypted session with Mandos server\n");

884

947

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

948

errno = EIO;

886

949

goto mandos_end;

891

954

}

892

955

893

956

if(debug){

894

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

957

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

895

958

}

896

959

897

960

if(quit_now){

909

972

910

973

if(buffer_length > 0){

911

974

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

975

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

976

&decrypted_buffer, mc);

915

977

if(decrypted_buffer_size >= 0){

916

978

917

979

written = 0;

927

989

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

928

990

int e = errno;

929

991

if(debug){

930

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

931

strerror(errno));

992

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

993

strerror(errno));

932

994

}

933

995

errno = e;

934

996

goto mandos_end;

978

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

979

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

980

1042

flags,

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

983

1047

984

1048

/* Called whenever a service has been resolved successfully or

985

1049

timed out */

991

1055

switch(event){

992

1056

default:

993

1057

case AVAHI_RESOLVER_FAILURE:

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)));

1058

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

1059

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

1060

domain,

1061

avahi_strerror(avahi_server_errno

1062

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

997

1063

break;

998

1064

999

1065

case AVAHI_RESOLVER_FOUND:

1001

1067

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1068

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

1003

1069

if(debug){

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);

1070

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

1071

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

1072

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

1007

1073

}

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1074

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

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1010

1078

if(ret == 0){

1011

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1012

1080

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1081

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

1082

avahi_proto_to_af(proto),

1083

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

1084

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

1085

" list\n", name);

1086

}

1015

1087

}

1016

1088

}

1017

1089

}

1027

1099

const char *domain,

1028

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1029

1101

flags,

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1032

1106

1033

1107

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

1034

1108

is removed from the LAN */

1041

1115

default:

1042

1116

case AVAHI_BROWSER_FAILURE:

1043

1117

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1118

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

1119

avahi_strerror(avahi_server_errno

1120

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

1121

avahi_simple_poll_quit(simple_poll);

1047

1122

return;

1048

1123

1049

1124

case AVAHI_BROWSER_NEW:

1052

1127

the callback function is called the Avahi server will free the

1053

1128

resolver for us. */

1054

1129

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)));

1130

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

1131

interface, protocol, name, type,

1132

domain, protocol, 0,

1133

resolve_callback, mc) == NULL)

1134

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

1135

" %s\n", name,

1136

avahi_strerror(avahi_server_errno

1137

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

1060

1138

break;

1061

1139

1062

1140

case AVAHI_BROWSER_REMOVE:

1065

1143

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1144

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1145

if(debug){

1068

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

1146

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

1147

" searching...\n");

1069

1148

}

1070

1149

break;

1071

1150

}

1080

1159

signal_received = sig;

1081

1160

int old_errno = errno;

1082

1161

/* set main loop to exit */

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1085

1164

}

1086

1165

errno = old_errno;

1087

1166

}

1088

1167

1089

1168

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

1090

1169

int ret;

1170

error_t ret_errno;

1091

1171

1092

1172

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

1093

1173

if(s < 0){

1174

ret_errno = errno;

1094

1175

perror_plus("socket");

1176

errno = ret_errno;

1095

1177

return false;

1096

1178

}

1097

1179

strcpy(ifr->ifr_name, ifname);

1098

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

1181

if(ret == -1){

1100

1182

if(debug){

1183

ret_errno = errno;

1101

1184

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1102

1186

}

1103

1187

return false;

1104

1188

}

1110

1194

/* Reject the loopback device */

1111

1195

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1196

if(debug){

1113

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

1114

ifname);

1197

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

1198

ifname);

1115

1199

}

1116

1200

return false;

1117

1201

}

1118

1202

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

1119

1203

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

1120

1204

if(debug){

1121

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

1122

ifname);

1205

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

1206

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

1123

1207

}

1124

1208

return true;

1125

1209

}

1126

1210

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

1127

1211

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

1128

1212

if(debug){

1129

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

1130

ifname);

1213

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1214

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

1131

1215

}

1132

1216

return false;

1133

1217

}

1134

1218

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

1135

1219

if(ifr->ifr_flags & IFF_NOARP){

1136

1220

if(debug){

1137

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

1221

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

1222

ifname);

1138

1223

}

1139

1224

return false;

1140

1225

}

1141

1226

1142

1227

/* Accept this device */

1143

1228

if(debug){

1144

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

1229

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

1145

1230

}

1146

1231

return true;

1147

1232

}

1159

1244

struct ifreq ifr;

1160

1245

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

1161

1246

if(debug){

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;

1247

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

1248

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

1249

}

1250

return 0;

1251

}

1252

1253

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

1254

return 0;

1255

}

1256

return 1;

1257

}

1258

1259

/*

1260

* This function determines if a network interface is up.

1261

*/

1262

bool interface_is_up(const char *interface){

1263

struct ifreq ifr;

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1269

return false;

1270

}

1271

1272

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

1273

}

1274

1275

/*

1276

* This function determines if a network interface is running

1277

*/

1278

bool interface_is_running(const char *interface){

1279

struct ifreq ifr;

1280

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

1281

if(debug){

1282

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

1283

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

1284

}

1285

return false;

1286

}

1287

1288

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

1215

1289

}

1216

1290

1217

1291

int notdotentries(const struct dirent *direntry){

1228

1302

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

1229

1303

int runnable_hook(const struct dirent *direntry){

1230

1304

int ret;

1305

size_t sret;

1231

1306

struct stat st;

1232

1307

1233

1308

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

1235

1310

return 0;

1236

1311

}

1237

1312

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);

1313

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

1314

"abcdefghijklmnopqrstuvwxyz"

1315

"0123456789"

1316

"_-");

1317

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

1318

/* Contains non-allowed characters */

1319

if(debug){

1320

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

1321

direntry->d_name);

1322

}

1323

return 0;

1324

}

1325

1326

char *fullname = NULL;

1327

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

1328

if(ret < 0){

1329

perror_plus("asprintf");

1330

return 0;

1331

}

1332

1333

ret = stat(fullname, &st);

1255

1334

if(ret == -1){

1256

1335

if(debug){

1257

perror_plus("Could not stat plugin");

1336

perror_plus("Could not stat hook");

1258

1337

}

1259

1338

return 0;

1260

1339

}

1261

1340

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

1262

1341

/* Not a regular file */

1342

if(debug){

1343

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

1344

direntry->d_name);

1345

}

1263

1346

return 0;

1264

1347

}

1265

1348

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

1266

1349

/* Not executable */

1350

if(debug){

1351

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

1352

direntry->d_name);

1353

}

1267

1354

return 0;

1268

1355

}

1356

if(debug){

1357

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

1358

direntry->d_name);

1359

}

1269

1360

return 1;

1270

1361

}

1271

1362

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1273

1365

int ret;

1274

1366

struct timespec now;

1275

1367

struct timespec waited_time;

1276

1368

intmax_t block_time;

1277

1369

1278

1370

while(true){

1279

if(mc.current_server == NULL){

1371

if(mc->current_server == NULL){

1280

1372

if (debug){

1281

fprintf(stderr,

1282

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

1373

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

1374

" No timeout!\n");

1283

1375

}

1284

1376

ret = avahi_simple_poll_iterate(s, -1);

1285

1377

} else {

1286

1378

if (debug){

1287

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

1288

" or wait\n");

1379

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

1380

" it, or wait\n");

1289

1381

}

1290

1382

/* the current time */

1291

1383

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1296

1388

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

1297

1389

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

1298

1390

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1391

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

1300

1392

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1393

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

1302

1394

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

1303

1395

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

1304

1396

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

1307

1399

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

1308

1400

1309

1401

if (debug){

1310

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

1402

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

1403

block_time);

1311

1404

}

1312

1405

1313

1406

if(block_time <= 0){

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

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

1408

mc->current_server->port,

1409

mc->current_server->if_index,

1410

mc->current_server->af, mc);

1318

1411

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1412

avahi_simple_poll_quit(s);

1320

1413

return 0;

1321

1414

}

1322

1415

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1416

&mc->current_server->last_seen);

1324

1417

if(ret == -1){

1325

1418

perror_plus("clock_gettime");

1326

1419

return -1;

1327

1420

}

1328

mc.current_server = mc.current_server->next;

1421

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

1329

1422

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

1330

1423

servers, but don't block */

1331

1424

}

1333

1426

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

1334

1427

}

1335

1428

if(ret != 0){

1336

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

1429

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

1337

1430

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

1338

1431

}

1339

1432

}

1340

1433

}

1341

1434

}

1342

1435

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

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

1489

const float delay){

1490

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1493

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

1494

alphasort);

1495

if(numhooks == -1){

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1504

} else {

1505

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

1506

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

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

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

1510

if(ret < 0){

1511

perror_plus("asprintf");

1512

continue;

1513

}

1514

if(debug){

1515

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

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

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

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

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

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

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

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1570

free(delaystring);

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

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

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

1582

} else {

1583

int status;

1584

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

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

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

1592

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

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

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

1599

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

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

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

1605

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

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

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

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

return true;

1619

}

1620

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1627

struct ifreq network;

1628

unsigned int if_index = if_nametoindex(interface);

1629

if(if_index == 0){

1630

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

1631

errno = old_errno;

1632

return ENXIO;

1633

}

1634

1635

if(quit_now){

1636

errno = old_errno;

1637

return EINTR;

1638

}

1639

1640

if(not interface_is_up(interface)){

1641

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

1642

ret_errno = errno;

1643

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

1644

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

1645

return ret_errno;

1646

}

1647

network.ifr_flags |= IFF_UP;

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

ret_errno = errno;

1652

perror_plus("socket");

1653

errno = old_errno;

1654

return ret_errno;

1655

}

1656

1657

if(quit_now){

1658

close(sd);

1659

errno = old_errno;

1660

return EINTR;

1661

}

1662

1663

if(debug){

1664

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

1665

interface);

1666

}

1667

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1671

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1679

}

1680

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1683

#ifdef __linux__

1684

if(restore_loglevel){

1685

ret_linux = klogctl(7, NULL, 0);

1686

if(ret_linux == -1){

1687

perror_plus("klogctl");

1688

}

1689

}

1690

#endif /* __linux__ */

1691

1692

/* Lower privileges */

1693

lower_privileges();

1694

1695

/* Close the socket */

1696

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

1697

if(ret == -1){

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

} else if(debug){

1708

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

1709

interface);

1710

}

1711

1712

/* Sleep checking until interface is running.

1713

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

1714

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

1715

if(interface_is_running(interface)){

1716

break;

1717

}

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1719

ret = nanosleep(&sleeptime, NULL);

1720

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

1721

perror_plus("nanosleep");

1722

}

1723

}

1724

1725

errno = old_errno;

1726

return 0;

1727

}

1728

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

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

1743

ret_errno = errno;

1744

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

1745

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

1746

return ret_errno;

1747

}

1748

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

1749

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1752

ret_errno = errno;

1753

perror_plus("socket");

1754

errno = old_errno;

1755

return ret_errno;

1756

}

1757

1758

if(debug){

1759

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

1760

interface);

1761

}

1762

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ret_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

errno = old_errno;

1782

return ret_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

errno = old_errno;

1790

return 0;

1791

}

1792

1343

1793

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

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

1344

1798

AvahiSServiceBrowser *sb = NULL;

1345

int error;

1799

error_t ret_errno;

1346

1800

int ret;

1347

1801

intmax_t tmpmax;

1348

1802

char *tmp;

1349

1803

int exitcode = EXIT_SUCCESS;

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;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1356

1806

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

1357

1807

bool tempdir_created = false;

1358

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1359

1809

const char *seckey = PATHDIR "/" SECKEY;

1360

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1361

1813

1362

1814

bool gnutls_initialized = false;

1363

1815

bool gpgme_initialized = false;

1425

1877

.group = 2 },

1426

1878

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

1427

1879

.arg = "SECONDS",

1428

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

1880

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

1881

.group = 2 },

1882

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

1883

.arg = "DIR",

1884

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

1429

1885

.group = 2 },

1430

1886

/*

1431

1887

* These reproduce what we would get without ARGP_NO_HELP

1450

1906

connect_to = arg;

1451

1907

break;

1452

1908

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

1453

interface = arg;

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1454

1914

break;

1455

1915

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

1456

1916

seckey = arg;

1485

1945

argp_error(state, "Bad retry interval");

1486

1946

}

1487

1947

break;

1948

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

1949

hookdir = arg;

1950

break;

1488

1951

/*

1489

1952

* These reproduce what we would get without ARGP_NO_HELP

1490

1953

*/

1496

1959

argp_state_help(state, state->out_stream,

1497

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

1961

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

1499

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

1962

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

1500

1963

exit(argp_err_exit_status);

1501

1964

break;

1502

1965

default:

1529

1992

{

1530

1993

/* Work around Debian bug #633582:

1531

1994

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

1532

struct stat st;

1533

1995

1534

1996

/* Re-raise priviliges */

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

setenv("DEVICE", interface, 1);

1612

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

1613

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

1614

/* setenv( XXX more here */

1615

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

1616

perror_plus("execl");

1617

}

1618

free(fullname);

1619

if(quit_now){

1997

if(raise_privileges() == 0){

1998

struct stat st;

1999

2000

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

2001

int seckey_fd = open(seckey, O_RDONLY);

2002

if(seckey_fd == -1){

2003

perror_plus("open");

2004

} else {

2005

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

2006

if(ret == -1){

2007

perror_plus("fstat");

2008

} else {

2009

if(S_ISREG(st.st_mode)

2010

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

2011

ret = fchown(seckey_fd, uid, gid);

2012

if(ret == -1){

2013

perror_plus("fchown");

2014

}

2015

}

2016

}

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2018

}

2019

}

2020

2021

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

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2023

if(pubkey_fd == -1){

2024

perror_plus("open");

2025

} else {

2026

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

2027

if(ret == -1){

2028

perror_plus("fstat");

2029

} else {

2030

if(S_ISREG(st.st_mode)

2031

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

2032

ret = fchown(pubkey_fd, uid, gid);

2033

if(ret == -1){

2034

perror_plus("fchown");

2035

}

2036

}

2037

}

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2042

/* Lower privileges */

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

2060

}

2061

}

2062

}

2063

2064

/* Run network hooks */

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

1620

2070

goto end;

1621

2071

}

1622

}

1623

close(devnull);

2072

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

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

1624

2081

}

1625

2082

1626

2083

if(not debug){

1627

2084

avahi_set_log_function(empty_log);

1628

2085

}

1629

2086

1630

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

1631

struct dirent **direntries;

1632

/* First look for interfaces that are up */

1633

ret = scandir(sys_class_net, &direntries, up_interface,

1634

alphasort);

1635

if(ret == 0){

1636

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

1637

free(direntries);

1638

ret = scandir(sys_class_net, &direntries, good_interface,

1639

alphasort);

1640

}

1641

if(ret >= 1){

1642

/* Pick the first interface returned */

1643

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

1644

if(debug){

1645

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

1646

}

1647

if(interface == NULL){

1648

perror_plus("malloc");

1649

free(direntries);

1650

exitcode = EXIT_FAILURE;

1651

goto end;

1652

}

1653

free(direntries);

1654

} else {

1655

free(direntries);

1656

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

1657

exitcode = EXIT_FAILURE;

1658

goto end;

1659

}

1660

}

1661

1662

2087

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

1663

2088

from the signal handler */

1664

2089

/* Initialize the pseudo-RNG for Avahi */

1665

2090

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

1666

mc.simple_poll = avahi_simple_poll_new();

1667

if(mc.simple_poll == NULL){

1668

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

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

2093

fprintf_plus(stderr,

2094

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

1669

2095

exitcode = EX_UNAVAILABLE;

1670

2096

goto end;

1671

2097

}

1733

2159

}

1734

2160

}

1735

2161

1736

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

1737

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

1738

if_index = (AvahiIfIndex) if_nametoindex(interface);

1739

if(if_index == 0){

1740

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

1741

exitcode = EX_UNAVAILABLE;

1742

goto end;

1743

}

1744

1745

if(quit_now){

1746

goto end;

1747

}

1748

1749

/* Re-raise priviliges */

1750

errno = 0;

1751

ret = seteuid(0);

1752

if(ret == -1){

1753

perror_plus("seteuid");

1754

}

1755

1756

#ifdef __linux__

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret = klogctl(8, NULL, 5);

1760

bool restore_loglevel = true;

1761

if(ret == -1){

1762

restore_loglevel = false;

1763

perror_plus("klogctl");

1764

}

1765

#endif /* __linux__ */

1766

1767

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1768

if(sd < 0){

1769

perror_plus("socket");

1770

exitcode = EX_OSERR;

1771

#ifdef __linux__

1772

if(restore_loglevel){

1773

ret = klogctl(7, NULL, 0);

1774

if(ret == -1){

1775

perror_plus("klogctl");

1776

}

1777

}

1778

#endif /* __linux__ */

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1784

}

1785

goto end;

1786

}

1787

strcpy(network.ifr_name, interface);

1788

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

1789

if(ret == -1){

1790

perror_plus("ioctl SIOCGIFFLAGS");

1791

#ifdef __linux__

1792

if(restore_loglevel){

1793

ret = klogctl(7, NULL, 0);

1794

if(ret == -1){

1795

perror_plus("klogctl");

1796

}

1797

}

1798

#endif /* __linux__ */

1799

exitcode = EX_OSERR;

1800

/* Lower privileges */

1801

errno = 0;

1802

ret = seteuid(uid);

1803

if(ret == -1){

1804

perror_plus("seteuid");

1805

}

1806

goto end;

1807

}

1808

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

1809

network.ifr_flags |= IFF_UP;

1810

take_down_interface = true;

1811

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

1812

if(ret == -1){

1813

take_down_interface = false;

1814

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1815

exitcode = EX_OSERR;

1816

#ifdef __linux__

1817

if(restore_loglevel){

1818

ret = klogctl(7, NULL, 0);

1819

if(ret == -1){

1820

perror_plus("klogctl");

2162

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

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

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

2171

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

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

perror_plus("argz_add");

2175

continue;

2176

}

2177

if(debug){

2178

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

2179

direntries[i]->d_name);

2180

}

2181

}

2182

free(direntries);

2183

} else {

2184

free(direntries);

2185

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

2186

exitcode = EXIT_FAILURE;

2187

goto end;

2188

}

2189

}

2190

2191

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

2192

{

2193

char *interface = NULL;

2194

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

2195

interface))){

2196

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

2197

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

2198

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

2199

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

2200

interface);

2201

interface = NULL;

2202

while((interface = argz_next(mc.interfaces,

2203

mc.interfaces_size, interface))){

2204

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

2205

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

2206

interface);

2207

interface = NULL;

1821

2208

}

1822

2209

}

1823

#endif /* __linux__ */

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

}

1833

/* Sleep checking until interface is running.

1834

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

1835

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

1836

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

1837

if(ret == -1){

1838

perror_plus("ioctl SIOCGIFFLAGS");

1839

} else if(network.ifr_flags & IFF_RUNNING){

1840

2210

break;

1841

2211

}

1842

struct timespec sleeptime = { .tv_nsec = 250000000 };

1843

ret = nanosleep(&sleeptime, NULL);

1844

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

1845

perror_plus("nanosleep");

1846

}

1847

}

1848

if(not take_down_interface){

1849

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

1850

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

1851

if(ret == -1){

1852

perror_plus("close");

1853

}

1854

}

1855

#ifdef __linux__

1856

if(restore_loglevel){

1857

/* Restores kernel loglevel to default */

1858

ret = klogctl(7, NULL, 0);

1859

if(ret == -1){

1860

perror_plus("klogctl");

1861

}

1862

}

1863

#endif /* __linux__ */

1864

/* Lower privileges */

1865

errno = 0;

1866

if(take_down_interface){

1867

/* Lower privileges */

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

} else {

1873

/* Lower privileges permanently */

1874

ret = setuid(uid);

1875

if(ret == -1){

1876

perror_plus("setuid");

1877

}

1878

}

2212

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2214

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2218

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2222

}

2223

}

2224

}

2225

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

2226

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

2227

}

2228

}

2229

2230

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

2231

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

2232

if(debug){

2233

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

2234

mc.interfaces);

2235

}

2236

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

1879

2237

}

1880

2238

1881

2239

if(quit_now){

1882

2240

goto end;

1883

2241

}

1884

2242

1885

ret = init_gnutls_global(pubkey, seckey);

2243

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

1886

2244

if(ret == -1){

1887

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

2245

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

1888

2246

exitcode = EX_UNAVAILABLE;

1889

2247

goto end;

1890

2248

} else {

1905

2263

goto end;

1906

2264

}

1907

2265

1908

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

1909

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

2266

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

2267

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

1910

2268

exitcode = EX_UNAVAILABLE;

1911

2269

goto end;

1912

2270

} else {

1921

2279

/* Connect directly, do not use Zeroconf */

1922

2280

/* (Mainly meant for debugging) */

1923

2281

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

2282

1924

2283

if(address == NULL){

1925

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

2284

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

1926

2285

exitcode = EX_USAGE;

1927

2286

goto end;

1928

2287

}

1931

2290

goto end;

1932

2291

}

1933

2292

1934

uint16_t port;

2293

in_port_t port;

1935

2294

errno = 0;

1936

2295

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

1937

2296

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

1938

or tmpmax != (uint16_t)tmpmax){

1939

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

2297

or tmpmax != (in_port_t)tmpmax){

2298

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

1940

2299

exitcode = EX_USAGE;

1941

2300

goto end;

1942

2301

}

1943

2302

1944

2303

if(quit_now){

1945

2304

goto end;

1946

2305

}

1947

2306

1948

port = (uint16_t)tmpmax;

2307

port = (in_port_t)tmpmax;

1949

2308

*address = '\0';

1950

2309

/* Colon in address indicates IPv6 */

1951

2310

int af;

1967

2326

}

1968

2327

1969

2328

while(not quit_now){

1970

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

2329

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

2330

&mc);

1971

2331

if(quit_now or ret == 0){

1972

2332

break;

1973

2333

}

1974

2334

if(debug){

1975

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

1976

(int)retry_interval);

2335

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

2336

(int)retry_interval);

1977

2337

}

1978

sleep((int)retry_interval);

2338

sleep((unsigned int)retry_interval);

1979

2339

}

1980

2340

1981

2341

if (not quit_now){

1999

2359

config.publish_domain = 0;

2000

2360

2001

2361

/* Allocate a new server */

2002

mc.server = avahi_server_new(avahi_simple_poll_get

2003

(mc.simple_poll), &config, NULL,

2004

NULL, &error);

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2005

2364

2006

2365

/* Free the Avahi configuration data */

2007

2366

avahi_server_config_free(&config);

2009

2368

2010

2369

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

2011

2370

if(mc.server == NULL){

2012

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

2013

avahi_strerror(error));

2371

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

2372

avahi_strerror(ret_errno));

2014

2373

exitcode = EX_UNAVAILABLE;

2015

2374

goto end;

2016

2375

}

2022

2381

/* Create the Avahi service browser */

2023

2382

sb = avahi_s_service_browser_new(mc.server, if_index,

2024

2383

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2025

NULL, 0, browse_callback, NULL);

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2026

2386

if(sb == NULL){

2027

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

2028

avahi_strerror(avahi_server_errno(mc.server)));

2387

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

2388

avahi_strerror(avahi_server_errno(mc.server)));

2029

2389

exitcode = EX_UNAVAILABLE;

2030

2390

goto end;

2031

2391

}

2037

2397

/* Run the main loop */

2038

2398

2039

2399

if(debug){

2040

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

2400

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

2041

2401

}

2042

2402

2043

ret = avahi_loop_with_timeout(mc.simple_poll,

2044

(int)(retry_interval * 1000));

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2045

2405

if(debug){

2046

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

2047

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

2406

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

2407

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

2048

2408

}

2049

2409

2050

2410

end:

2051

2411

2052

2412

if(debug){

2053

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

2413

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

2054

2414

}

2055

2415

2056

2416

/* Cleanup things */

2417

free(mc.interfaces);

2418

2057

2419

if(sb != NULL)

2058

2420

avahi_s_service_browser_free(sb);

2059

2421

2060

2422

if(mc.server != NULL)

2061

2423

avahi_server_free(mc.server);

2062

2424

2063

if(mc.simple_poll != NULL)

2064

avahi_simple_poll_free(mc.simple_poll);

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2065

2427

2066

2428

if(gnutls_initialized){

2067

2429

gnutls_certificate_free_credentials(mc.cred);

2072

2434

if(gpgme_initialized){

2073

2435

gpgme_release(mc.ctx);

2074

2436

}

2075

2437

2076

2438

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

2077

2439

has seen */

2078

2440

if(mc.current_server != NULL){

2084

2446

}

2085

2447

}

2086

2448

2087

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

2088

2089

/* Take down the network interface */

2090

if(take_down_interface){

2091

/* Re-raise priviliges */

2092

errno = 0;

2093

ret = seteuid(0);

2094

if(ret == -1){

2095

perror_plus("seteuid");

2096

}

2097

if(geteuid() == 0){

2098

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

2099

if(ret == -1){

2100

perror_plus("ioctl SIOCGIFFLAGS");

2101

} else if(network.ifr_flags & IFF_UP) {

2102

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

2103

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

2104

if(ret == -1){

2105

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2449

/* Re-raise priviliges */

2450

{

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2106

2467

}

2107

2468

}

2108

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

2109

if(ret == -1){

2110

perror_plus("close");

2111

}

2112

/* Lower privileges permanently */

2113

errno = 0;

2114

ret = setuid(uid);

2115

if(ret == -1){

2116

perror_plus("setuid");

2469

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

2470

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

2471

" down\n");

2117

2472

}

2118

2473

}

2474

2475

lower_privileges_permanently();

2119

2476

}

2120

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2480

2121

2481

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

2122

2482

if(tempdir_created){

2123

2483

struct dirent **direntries = NULL;

2136

2496

}

2137

2497

ret = remove(fullname);

2138

2498

if(ret == -1){

2139

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

2140

strerror(errno));

2499

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

2500

strerror(errno));

2141

2501

}

2142

2502

free(fullname);

2143

2503

}