/mandos/trunk : revision 505.2.6

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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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opendir(), DIR */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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inet_pton(), connect() */

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

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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

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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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argp_state, struct argp,

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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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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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const char * argp_program_version = "mandos-client " VERSION;

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

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const char *argp_program_version = "mandos-client " VERSION;

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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), nonnull))

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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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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", 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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* 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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__attribute__((nonnull, warn_unused_result))

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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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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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

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if(buffer == NULL){

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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__attribute__((nonnull, warn_unused_result))

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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, 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));

225

207

if(new_server == NULL){

226

208

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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.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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}

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

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return -1;

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}

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/* Special case of first server */

243

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

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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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}

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return true;

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mc.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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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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241

*/

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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

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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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246

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/*

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

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250

*/

271

bool import_key(const char * const filename){

251

bool import_key(const char *filename){

272

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int ret;

273

253

int fd;

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254

gpgme_data_t pgp_data;

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262

rc = gpgme_data_new_from_fd(&pgp_data, fd);

283

263

if(rc != GPG_ERR_NO_ERROR){

284

264

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

265

gpgme_strsource(rc), gpgme_strerror(rc));

286

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return false;

287

267

}

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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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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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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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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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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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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_plus(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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"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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324

}

346

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* Decrypt OpenPGP data.

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* Returns -1 on error

357

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*/

358

__attribute__((nonnull, warn_unused_result))

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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,

362

mandos_context *mc){

339

char **plaintext){

363

340

gpgme_data_t dh_crypto, dh_plain;

364

341

gpgme_error_t rc;

365

342

ssize_t ret;

375

352

0);

376

353

if(rc != GPG_ERR_NO_ERROR){

377

354

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

355

gpgme_strsource(rc), gpgme_strerror(rc));

379

356

return -1;

380

357

}

381

358

383

360

rc = gpgme_data_new(&dh_plain);

384

361

if(rc != GPG_ERR_NO_ERROR){

385

362

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

388

365

gpgme_data_release(dh_crypto);

389

366

return -1;

390

367

}

391

368

392

369

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

393

370

data buffer */

394

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

371

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

395

372

if(rc != GPG_ERR_NO_ERROR){

396

373

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

374

gpgme_strsource(rc), gpgme_strerror(rc));

398

375

plaintext_length = -1;

399

376

if(debug){

400

377

gpgme_decrypt_result_t result;

401

result = gpgme_op_decrypt_result(mc->ctx);

378

result = gpgme_op_decrypt_result(mc.ctx);

402

379

if(result == NULL){

403

380

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

404

381

} else {

405

382

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

406

result->unsupported_algorithm);

383

result->unsupported_algorithm);

407

384

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

408

result->wrong_key_usage);

385

result->wrong_key_usage);

409

386

if(result->file_name != NULL){

410

387

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

411

388

}

413

390

recipient = result->recipients;

414

391

while(recipient != NULL){

415

392

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

416

gpgme_pubkey_algo_name

417

(recipient->pubkey_algo));

393

gpgme_pubkey_algo_name(recipient->pubkey_algo));

418

394

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

419

395

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

420

recipient->status == GPG_ERR_NO_SECKEY

421

? "No" : "Yes");

396

recipient->status == GPG_ERR_NO_SECKEY

397

? "No" : "Yes");

422

398

recipient = recipient->next;

423

399

}

424

400

}

481

457

return plaintext_length;

482

458

}

483

459

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

460

static const char * safer_gnutls_strerror(int value){

461

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

462

-Wunreachable-code */

487

463

if(ret == NULL)

488

464

ret = "(unknown)";

489

465

return ret;

490

466

}

491

467

492

468

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

469

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

495

470

const char* string){

496

471

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

497

472

}

498

473

499

__attribute__((nonnull, warn_unused_result))

500

474

static int init_gnutls_global(const char *pubkeyfilename,

501

const char *seckeyfilename,

502

mandos_context *mc){

475

const char *seckeyfilename){

503

476

int ret;

504

477

505

478

if(debug){

508

481

509

482

ret = gnutls_global_init();

510

483

if(ret != GNUTLS_E_SUCCESS){

511

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

512

safer_gnutls_strerror(ret));

484

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

513

485

return -1;

514

486

}

515

487

522

494

}

523

495

524

496

/* OpenPGP credentials */

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

497

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

498

if(ret != GNUTLS_E_SUCCESS){

527

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

528

safer_gnutls_strerror(ret));

499

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

529

500

gnutls_global_deinit();

530

501

return -1;

531

502

}

532

503

533

504

if(debug){

534

505

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

506

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

507

seckeyfilename);

538

508

}

539

509

540

510

ret = gnutls_certificate_set_openpgp_key_file

541

(mc->cred, pubkeyfilename, seckeyfilename,

511

(mc.cred, pubkeyfilename, seckeyfilename,

542

512

GNUTLS_OPENPGP_FMT_BASE64);

543

513

if(ret != GNUTLS_E_SUCCESS){

544

514

fprintf_plus(stderr,

545

515

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

546

516

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

547

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

548

safer_gnutls_strerror(ret));

517

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

549

518

goto globalfail;

550

519

}

551

520

552

521

/* GnuTLS server initialization */

553

ret = gnutls_dh_params_init(&mc->dh_params);

522

ret = gnutls_dh_params_init(&mc.dh_params);

554

523

if(ret != GNUTLS_E_SUCCESS){

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

524

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

525

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

558

526

goto globalfail;

559

527

}

560

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

528

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

561

529

if(ret != GNUTLS_E_SUCCESS){

562

530

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

563

safer_gnutls_strerror(ret));

531

safer_gnutls_strerror(ret));

564

532

goto globalfail;

565

533

}

566

534

567

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

535

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

536

569

537

return 0;

570

538

571

539

globalfail:

572

540

573

gnutls_certificate_free_credentials(mc->cred);

541

gnutls_certificate_free_credentials(mc.cred);

574

542

gnutls_global_deinit();

575

gnutls_dh_params_deinit(mc->dh_params);

543

gnutls_dh_params_deinit(mc.dh_params);

576

544

return -1;

577

545

}

578

546

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

547

static int init_gnutls_session(gnutls_session_t *session){

582

548

int ret;

583

549

/* GnuTLS session creation */

584

550

do {

588

554

}

589

555

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

590

556

if(ret != GNUTLS_E_SUCCESS){

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

557

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

558

safer_gnutls_strerror(ret));

594

559

}

595

560

596

561

{

597

562

const char *err;

598

563

do {

599

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

564

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

600

565

if(quit_now){

601

566

gnutls_deinit(*session);

602

567

return -1;

604

569

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

605

570

if(ret != GNUTLS_E_SUCCESS){

606

571

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

607

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

608

safer_gnutls_strerror(ret));

572

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

609

573

gnutls_deinit(*session);

610

574

return -1;

611

575

}

613

577

614

578

do {

615

579

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

616

mc->cred);

580

mc.cred);

617

581

if(quit_now){

618

582

gnutls_deinit(*session);

619

583

return -1;

621

585

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

622

586

if(ret != GNUTLS_E_SUCCESS){

623

587

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

624

safer_gnutls_strerror(ret));

588

safer_gnutls_strerror(ret));

625

589

gnutls_deinit(*session);

626

590

return -1;

627

591

}

629

593

/* ignore client certificate if any. */

630

594

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

631

595

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

597

634

598

return 0;

635

599

}

639

603

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

640

604

641

605

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

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

606

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

644

607

AvahiIfIndex if_index,

645

int af, mandos_context *mc){

608

int af){

646

609

int ret, tcp_sd = -1;

647

610

ssize_t sret;

648

struct sockaddr_storage to;

611

union {

612

struct sockaddr_in in;

613

struct sockaddr_in6 in6;

614

} to;

649

615

char *buffer = NULL;

650

616

char *decrypted_buffer = NULL;

651

617

size_t buffer_length = 0;

675

641

return -1;

676

642

}

677

643

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

644

ret = init_gnutls_session(&session);

711

645

if(ret != 0){

712

646

return -1;

713

647

}

714

648

715

649

if(debug){

716

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

717

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

650

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

651

"\n", ip, port);

718

652

}

719

653

720

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

732

666

733

667

memset(&to, 0, sizeof(to));

734

668

if(af == AF_INET6){

735

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

736

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

669

to.in6.sin6_family = (sa_family_t)af;

670

ret = inet_pton(af, ip, &to.in6.sin6_addr);

737

671

} else { /* IPv4 */

738

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

739

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

672

to.in.sin_family = (sa_family_t)af;

673

ret = inet_pton(af, ip, &to.in.sin_addr);

740

674

}

741

675

if(ret < 0 ){

742

676

int e = errno;

751

685

goto mandos_end;

752

686

}

753

687

if(af == AF_INET6){

754

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

755

if(IN6_IS_ADDR_LINKLOCAL

756

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

688

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

689

-Wconversion and

690

-Wunreachable-code */

691

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

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

694

-Wunreachable-code*/

757

695

if(if_index == AVAHI_IF_UNSPEC){

758

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

759

" incomplete without a network interface\n");

696

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

697

" without a network interface\n");

760

698

errno = EINVAL;

761

699

goto mandos_end;

762

700

}

763

701

/* Set the network interface number as scope */

764

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

702

to.in6.sin6_scope_id = (uint32_t)if_index;

765

703

}

766

704

} else {

767

((struct sockaddr_in *)&to)->sin_port = htons(port);

705

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

706

-Wconversion and

707

-Wunreachable-code */

768

708

}

769

709

770

710

if(quit_now){

778

718

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

779

719

perror_plus("if_indextoname");

780

720

} else {

781

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

782

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

721

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

722

ip, interface, port);

783

723

}

784

724

} else {

785

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

786

ip, (uintmax_t)port);

725

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

787

726

}

788

727

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

728

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

const char *pcret;

790

730

if(af == AF_INET6){

791

ret = getnameinfo((struct sockaddr *)&to,

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

731

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

732

sizeof(addrstr));

795

733

} else {

796

ret = getnameinfo((struct sockaddr *)&to,

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

734

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

735

sizeof(addrstr));

800

736

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

805

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

806

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

737

if(pcret == NULL){

738

perror_plus("inet_ntop");

739

} else {

740

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

741

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

742

}

807

743

}

808

744

}

809

745

813

749

}

814

750

815

751

if(af == AF_INET6){

816

ret = connect(tcp_sd, (struct sockaddr *)&to,

817

sizeof(struct sockaddr_in6));

752

ret = connect(tcp_sd, &to.in6, sizeof(to));

818

753

} else {

819

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

820

sizeof(struct sockaddr_in));

754

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

821

755

}

822

756

if(ret < 0){

823

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

757

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

824

758

int e = errno;

825

759

perror_plus("connect");

826

760

errno = e;

872

806

goto mandos_end;

873

807

}

874

808

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

809

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

810

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

880

811

881

812

if(quit_now){

882

813

errno = EINTR;

903

834

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

904

835

905

836

if(debug){

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

837

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

908

838

}

909

839

910

840

while(true){

948

878

}

949

879

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

950

880

if(ret < 0){

951

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

952

"***\n");

881

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

953

882

gnutls_perror(ret);

954

883

errno = EPROTO;

955

884

goto mandos_end;

957

886

break;

958

887

default:

959

888

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

960

" encrypted session with Mandos server\n");

889

" encrypted session with Mandos server\n");

961

890

gnutls_bye(session, GNUTLS_SHUT_RDWR);

962

891

errno = EIO;

963

892

goto mandos_end;

987

916

if(buffer_length > 0){

988

917

ssize_t decrypted_buffer_size;

989

918

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

919

&decrypted_buffer);

991

920

if(decrypted_buffer_size >= 0){

992

921

993

922

written = 0;

1004

933

int e = errno;

1005

934

if(debug){

1006

935

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

1007

strerror(errno));

936

strerror(errno));

1008

937

}

1009

938

errno = e;

1010

939

goto mandos_end;

1041

970

return retval;

1042

971

}

1043

972

1044

__attribute__((nonnull))

1045

973

static void resolve_callback(AvahiSServiceResolver *r,

1046

974

AvahiIfIndex interface,

1047

975

AvahiProtocol proto,

1055

983

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

984

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

985

flags,

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

986

AVAHI_GCC_UNUSED void* userdata){

987

assert(r);

1062

988

1063

989

/* Called whenever a service has been resolved successfully or

1064

990

timed out */

1070

996

switch(event){

1071

997

default:

1072

998

case AVAHI_RESOLVER_FAILURE:

1073

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

1074

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

1075

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

999

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

1000

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

1001

avahi_strerror(avahi_server_errno(mc.server)));

1078

1002

break;

1079

1003

1080

1004

case AVAHI_RESOLVER_FOUND:

1083

1007

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

1084

1008

if(debug){

1085

1009

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

1086

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

1087

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

1010

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

1011

ip, (intmax_t)interface, port);

1088

1012

}

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1013

int ret = start_mandos_communication(ip, port, interface,

1014

avahi_proto_to_af(proto));

1093

1015

if(ret == 0){

1094

avahi_simple_poll_quit(simple_poll);

1016

avahi_simple_poll_quit(mc.simple_poll);

1095

1017

} else {

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1018

ret = add_server(ip, port, interface,

1019

avahi_proto_to_af(proto));

1102

1020

}

1103

1021

}

1104

1022

}

1114

1032

const char *domain,

1115

1033

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1034

flags,

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1035

AVAHI_GCC_UNUSED void* userdata){

1036

assert(b);

1121

1037

1122

1038

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

1123

1039

is removed from the LAN */

1131

1047

case AVAHI_BROWSER_FAILURE:

1132

1048

1133

1049

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1050

avahi_strerror(avahi_server_errno(mc.server)));

1051

avahi_simple_poll_quit(mc.simple_poll);

1137

1052

return;

1138

1053

1139

1054

case AVAHI_BROWSER_NEW:

1142

1057

the callback function is called the Avahi server will free the

1143

1058

resolver for us. */

1144

1059

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1149

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

1150

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

1060

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

1061

name, type, domain, protocol, 0,

1062

resolve_callback, NULL) == NULL)

1063

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

1064

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

1153

1065

break;

1154

1066

1155

1067

case AVAHI_BROWSER_REMOVE:

1158

1070

case AVAHI_BROWSER_ALL_FOR_NOW:

1159

1071

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1160

1072

if(debug){

1161

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

1162

" searching...\n");

1073

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

1163

1074

}

1164

1075

break;

1165

1076

}

1174

1085

signal_received = sig;

1175

1086

int old_errno = errno;

1176

1087

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1088

if(mc.simple_poll != NULL){

1089

avahi_simple_poll_quit(mc.simple_poll);

1179

1090

}

1180

1091

errno = old_errno;

1181

1092

}

1182

1093

1183

__attribute__((nonnull, warn_unused_result))

1184

1094

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

1185

1095

int ret;

1186

error_t ret_errno;

1187

1096

1188

1097

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

1189

1098

if(s < 0){

1190

ret_errno = errno;

1191

1099

perror_plus("socket");

1192

errno = ret_errno;

1193

1100

return false;

1194

1101

}

1195

1102

strcpy(ifr->ifr_name, ifname);

1196

1103

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

1104

if(ret == -1){

1198

1105

if(debug){

1199

ret_errno = errno;

1200

1106

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1202

1107

}

1203

1108

return false;

1204

1109

}

1205

1110

return true;

1206

1111

}

1207

1112

1208

__attribute__((nonnull, warn_unused_result))

1209

1113

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

1210

1114

1211

1115

/* Reject the loopback device */

1212

1116

if(ifr->ifr_flags & IFF_LOOPBACK){

1213

1117

if(debug){

1214

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

1215

ifname);

1118

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

1216

1119

}

1217

1120

return false;

1218

1121

}

1219

1122

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

1220

1123

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

1221

1124

if(debug){

1222

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

1223

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

1125

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

1224

1126

}

1225

1127

return true;

1226

1128

}

1227

1129

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

1228

1130

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

1229

1131

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1132

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

1232

1133

}

1233

1134

return false;

1234

1135

}

1235

1136

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

1236

1137

if(ifr->ifr_flags & IFF_NOARP){

1237

1138

if(debug){

1238

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

1239

ifname);

1139

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

1240

1140

}

1241

1141

return false;

1242

1142

}

1253

1153

* corresponds to an acceptable network device.

1254

1154

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

1255

1155

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1156

int good_interface(const struct dirent *if_entry){

1258

1157

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

1259

1158

return 0;

1262

1161

struct ifreq ifr;

1263

1162

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

1264

1163

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1273

}

1274

return 1;

1275

}

1276

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1164

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

1165

if_entry->d_name);

1166

}

1167

return 0;

1168

}

1169

1170

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

1171

return 0;

1172

}

1173

return 1;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device which is up.

1179

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

1180

*/

1181

int up_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

if_entry->d_name);

1191

}

1192

return 0;

1193

}

1194

1195

/* Reject down interfaces */

1196

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

1197

if(debug){

1198

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

1199

if_entry->d_name);

1200

}

1201

return 0;

1202

}

1203

1204

/* Reject non-running interfaces */

1205

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

1206

if(debug){

1207

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

1208

if_entry->d_name);

1209

}

1210

return 0;

1211

}

1212

1213

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

1214

return 0;

1215

}

1216

return 1;

1217

}

1218

1312

1219

int notdotentries(const struct dirent *direntry){

1313

1220

/* Skip "." and ".." */

1314

1221

if(direntry->d_name[0] == '.'

1321

1228

}

1322

1229

1323

1230

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1231

int runnable_hook(const struct dirent *direntry){

1326

1232

int ret;

1327

1233

size_t sret;

1340

1246

/* Contains non-allowed characters */

1341

1247

if(debug){

1342

1248

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

1343

direntry->d_name);

1249

direntry->d_name);

1344

1250

}

1345

1251

return 0;

1346

1252

}

1363

1269

/* Not a regular file */

1364

1270

if(debug){

1365

1271

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

1366

direntry->d_name);

1272

direntry->d_name);

1367

1273

}

1368

1274

return 0;

1369

1275

}

1371

1277

/* Not executable */

1372

1278

if(debug){

1373

1279

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

1374

direntry->d_name);

1280

direntry->d_name);

1375

1281

}

1376

1282

return 0;

1377

1283

}

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

1284

return 1;

1383

1285

}

1384

1286

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1287

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1388

1288

int ret;

1389

1289

struct timespec now;

1390

1290

struct timespec waited_time;

1391

1291

intmax_t block_time;

1392

1292

1393

1293

while(true){

1394

if(mc->current_server == NULL){

1395

if(debug){

1396

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

1397

" No timeout!\n");

1294

if(mc.current_server == NULL){

1295

if (debug){

1296

fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");

1398

1297

}

1399

1298

ret = avahi_simple_poll_iterate(s, -1);

1400

1299

} else {

1401

if(debug){

1402

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

1403

" it, or wait\n");

1300

if (debug){

1301

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

1302

" or wait\n");

1404

1303

}

1405

1304

/* the current time */

1406

1305

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1411

1310

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

1412

1311

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

1413

1312

waited_time.tv_sec = (now.tv_sec

1414

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

1313

- mc.current_server->last_seen.tv_sec);

1415

1314

waited_time.tv_nsec = (now.tv_nsec

1416

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

1315

- mc.current_server->last_seen.tv_nsec);

1417

1316

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

1418

1317

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

1419

1318

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

1421

1320

- ((intmax_t)waited_time.tv_sec * 1000))

1422

1321

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

1423

1322

1424

if(debug){

1425

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

1426

block_time);

1323

if (debug){

1324

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

1427

1325

}

1428

1326

1429

1327

if(block_time <= 0){

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1328

ret = start_mandos_communication(mc.current_server->ip,

1329

mc.current_server->port,

1330

mc.current_server->if_index,

1331

mc.current_server->af);

1434

1332

if(ret == 0){

1435

avahi_simple_poll_quit(s);

1333

avahi_simple_poll_quit(mc.simple_poll);

1436

1334

return 0;

1437

1335

}

1438

1336

ret = clock_gettime(CLOCK_MONOTONIC,

1439

&mc->current_server->last_seen);

1337

&mc.current_server->last_seen);

1440

1338

if(ret == -1){

1441

1339

perror_plus("clock_gettime");

1442

1340

return -1;

1443

1341

}

1444

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

1342

mc.current_server = mc.current_server->next;

1445

1343

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

1446

1344

servers, but don't block */

1447

1345

}

1449

1347

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

1450

1348

}

1451

1349

if(ret != 0){

1452

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

1350

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

1453

1351

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

1454

1352

}

1455

1353

}

1456

1354

}

1457

1355

}

1458

1356

1459

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

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

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

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

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

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

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

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

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

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

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

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1515

__attribute__((nonnull))

1516

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

1517

const float delay){

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1521

if(numhooks == -1){

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

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

1534

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

1535

direntry = direntries[i];

1536

char *fullname = NULL;

1537

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

1538

if(ret < 0){

1539

perror_plus("asprintf");

1540

continue;

1541

}

1542

if(debug){

1543

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

1544

direntry->d_name);

1545

}

1546

pid_t hook_pid = fork();

1547

if(hook_pid == 0){

1548

/* Child */

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

perror_plus("dup2(devnull, STDIN_FILENO)");

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1581

_exit(EX_OSERR);

1582

}

1583

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

1584

if(ret == -1){

1585

perror_plus("setenv");

1586

_exit(EX_OSERR);

1587

}

1588

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

1589

if(ret == -1){

1590

perror_plus("setenv");

1591

_exit(EX_OSERR);

1592

}

1593

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

1594

if(ret == -1){

1595

perror_plus("setenv");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

char *delaystring;

1604

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

1605

if(ret == -1){

1606

perror_plus("asprintf");

1607

_exit(EX_OSERR);

1608

}

1609

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

1610

if(ret == -1){

1611

free(delaystring);

1612

perror_plus("setenv");

1613

_exit(EX_OSERR);

1614

}

1615

free(delaystring);

1616

if(connect_to != NULL){

1617

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

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

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

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

1627

} else {

1628

int status;

1629

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

1630

perror_plus("waitpid");

1631

free(fullname);

1632

continue;

1633

}

1634

if(WIFEXITED(status)){

1635

if(WEXITSTATUS(status) != 0){

1636

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

1637

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

1638

WEXITSTATUS(status));

1639

free(fullname);

1640

continue;

1641

}

1642

} else if(WIFSIGNALED(status)){

1643

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

1644

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

1645

WTERMSIG(status));

1646

free(fullname);

1647

continue;

1648

} else {

1649

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

1650

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

1651

free(fullname);

1652

continue;

1653

}

1654

}

1655

free(fullname);

1656

if(debug){

1657

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

1658

direntry->d_name);

1659

}

1660

}

1661

close(devnull);

1662

}

1663

}

1664

1665

__attribute__((nonnull, warn_unused_result))

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

1669

int ret;

1670

struct ifreq network;

1671

unsigned int if_index = if_nametoindex(interface);

1672

if(if_index == 0){

1673

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

1674

errno = old_errno;

1675

return ENXIO;

1676

}

1677

1678

if(quit_now){

1679

errno = old_errno;

1680

return EINTR;

1681

}

1682

1683

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1686

ret_errno = errno;

1687

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

1688

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

1689

errno = old_errno;

1690

return ret_errno;

1691

}

1692

network.ifr_flags |= IFF_UP; /* set flag */

1693

1694

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

1695

if(sd == -1){

1696

ret_errno = errno;

1697

perror_plus("socket");

1698

errno = old_errno;

1699

return ret_errno;

1700

}

1701

1702

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1707

errno = old_errno;

1708

return EINTR;

1709

}

1710

1711

if(debug){

1712

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

1713

interface);

1714

}

1715

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1722

#ifdef __linux__

1723

int ret_linux;

1724

if(ret_errno == 0){

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1726

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

1727

ret_linux = klogctl(8, NULL, 5);

1728

if(ret_linux == -1){

1729

perror_plus("klogctl");

1730

} else {

1731

restore_loglevel = true;

1732

}

1733

}

1734

#endif /* __linux__ */

1735

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

1736

ioctl_errno = errno;

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

ret_linux = klogctl(7, NULL, 0);

1740

if(ret_linux == -1){

1741

perror_plus("klogctl");

1742

}

1743

}

1744

#endif /* __linux__ */

1745

1746

/* If raise_privileges() succeeded above */

1747

if(ret_errno == 0){

1748

/* Lower privileges */

1749

ret_errno = lower_privileges();

1750

if(ret_errno != 0){

1751

errno = ret_errno;

1752

perror_plus("Failed to lower privileges");

1753

}

1754

}

1755

1756

/* Close the socket */

1757

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

1758

if(ret == -1){

1759

perror_plus("close");

1760

}

1761

1762

if(ret_setflags == -1){

1763

errno = ioctl_errno;

1764

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1765

errno = old_errno;

1766

return ioctl_errno;

1767

}

1768

} else if(debug){

1769

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

1770

interface);

1771

}

1772

1773

/* Sleep checking until interface is running.

1774

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

1775

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

1776

if(interface_is_running(interface)){

1777

break;

1778

}

1779

struct timespec sleeptime = { .tv_nsec = 250000000 };

1780

ret = nanosleep(&sleeptime, NULL);

1781

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

1782

perror_plus("nanosleep");

1783

}

1784

}

1785

1786

errno = old_errno;

1787

return 0;

1788

}

1789

1790

__attribute__((nonnull, warn_unused_result))

1791

error_t take_down_interface(const char *const interface){

1792

error_t old_errno = errno;

1793

struct ifreq network;

1794

unsigned int if_index = if_nametoindex(interface);

1795

if(if_index == 0){

1796

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

1797

errno = old_errno;

1798

return ENXIO;

1799

}

1800

if(interface_is_up(interface)){

1801

error_t ret_errno = 0, ioctl_errno = 0;

1802

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

1803

ret_errno = errno;

1804

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

1805

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

1806

errno = old_errno;

1807

return ret_errno;

1808

}

1809

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

1810

1811

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

1812

if(sd == -1){

1813

ret_errno = errno;

1814

perror_plus("socket");

1815

errno = old_errno;

1816

return ret_errno;

1817

}

1818

1819

if(debug){

1820

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

1821

interface);

1822

}

1823

1824

/* Raise privileges */

1825

ret_errno = raise_privileges();

1826

if(ret_errno != 0){

1827

perror_plus("Failed to raise privileges");

1828

}

1829

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

1830

ioctl_errno = errno;

1831

1832

/* If raise_privileges() succeeded above */

1833

if(ret_errno == 0){

1834

/* Lower privileges */

1835

ret_errno = lower_privileges();

1836

if(ret_errno != 0){

1837

errno = ret_errno;

1838

perror_plus("Failed to lower privileges");

1839

}

1840

}

1841

1842

/* Close the socket */

1843

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

1844

if(ret == -1){

1845

perror_plus("close");

1846

}

1847

1848

if(ret_setflags == -1){

1849

errno = ioctl_errno;

1850

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1851

errno = old_errno;

1852

return ioctl_errno;

1853

}

1854

} else if(debug){

1855

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

1856

interface);

1857

}

1858

1859

errno = old_errno;

1860

return 0;

1861

}

1862

1863

1357

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

1864

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

1865

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

1866

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

1867

.interfaces = NULL, .interfaces_size = 0 };

1868

1358

AvahiSServiceBrowser *sb = NULL;

1869

error_t ret_errno;

1359

int error;

1870

1360

int ret;

1871

1361

intmax_t tmpmax;

1872

1362

char *tmp;

1873

1363

int exitcode = EXIT_SUCCESS;

1874

char *interfaces_to_take_down = NULL;

1875

size_t interfaces_to_take_down_size = 0;

1876

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1877

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

1878

char *tempdir = NULL;

1364

const char *interface = "";

1365

struct ifreq network;

1366

int sd = -1;

1367

bool take_down_interface = false;

1368

uid_t uid;

1369

gid_t gid;

1370

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

1371

bool tempdir_created = false;

1879

1372

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1880

1373

const char *seckey = PATHDIR "/" SECKEY;

1881

1374

const char *pubkey = PATHDIR "/" PUBKEY;

1882

char *interfaces_hooks = NULL;

1883

1375

1884

1376

bool gnutls_initialized = false;

1885

1377

bool gpgme_initialized = false;

1947

1439

.group = 2 },

1948

1440

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

1949

1441

.arg = "SECONDS",

1950

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

1442

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

1951

1443

.group = 2 },

1952

1444

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

1953

1445

.arg = "DIR",

1976

1468

connect_to = arg;

1977

1469

break;

1978

1470

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

1979

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

1980

arg, (int)',');

1981

if(ret_errno != 0){

1982

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

1983

}

1471

interface = arg;

1984

1472

break;

1985

1473

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

1986

1474

seckey = arg;

2029

1517

argp_state_help(state, state->out_stream,

2030

1518

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2031

1519

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

1520

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

2032

1521

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

2033

1522

exit(argp_err_exit_status);

2034

1523

break;

2062

1551

{

2063

1552

/* Work around Debian bug #633582:

2064

1553

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

2065

2066

/* Re-raise privileges */

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2070

perror_plus("Failed to raise privileges");

1554

struct stat st;

1555

1556

/* Re-raise priviliges */

1557

errno = 0;

1558

ret = seteuid(0);

1559

if(ret == -1){

1560

perror_plus("seteuid");

1561

}

1562

1563

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

1564

int seckey_fd = open(seckey, O_RDONLY);

1565

if(seckey_fd == -1){

1566

perror_plus("open");

1567

} else {

1568

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

1569

if(ret == -1){

1570

perror_plus("fstat");

1571

} else {

1572

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

1573

ret = fchown(seckey_fd, uid, gid);

1574

if(ret == -1){

1575

perror_plus("fchown");

1576

}

1577

}

1578

}

1579

TEMP_FAILURE_RETRY(close(seckey_fd));

1580

}

1581

}

1582

1583

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

1584

int pubkey_fd = open(pubkey, O_RDONLY);

1585

if(pubkey_fd == -1){

1586

perror_plus("open");

1587

} else {

1588

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

1589

if(ret == -1){

1590

perror_plus("fstat");

1591

} else {

1592

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

1593

ret = fchown(pubkey_fd, uid, gid);

1594

if(ret == -1){

1595

perror_plus("fchown");

1596

}

1597

}

1598

}

1599

TEMP_FAILURE_RETRY(close(pubkey_fd));

1600

}

1601

}

1602

1603

/* Lower privileges */

1604

errno = 0;

1605

ret = seteuid(uid);

1606

if(ret == -1){

1607

perror_plus("seteuid");

1608

}

1609

}

1610

1611

/* Find network hooks and run them */

1612

{

1613

struct dirent **direntries;

1614

struct dirent *direntry;

1615

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

1616

alphasort);

1617

if(numhooks == -1){

1618

perror_plus("scandir");

2071

1619

} else {

2072

struct stat st;

2073

2074

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

2075

int seckey_fd = open(seckey, O_RDONLY);

2076

if(seckey_fd == -1){

2077

perror_plus("open");

2078

} else {

2079

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

2080

if(ret == -1){

2081

perror_plus("fstat");

2082

} else {

2083

if(S_ISREG(st.st_mode)

2084

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

2085

ret = fchown(seckey_fd, uid, gid);

2086

if(ret == -1){

2087

perror_plus("fchown");

2088

}

2089

}

2090

}

2091

TEMP_FAILURE_RETRY(close(seckey_fd));

2092

}

2093

}

2094

2095

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

2096

int pubkey_fd = open(pubkey, O_RDONLY);

2097

if(pubkey_fd == -1){

2098

perror_plus("open");

2099

} else {

2100

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

2101

if(ret == -1){

2102

perror_plus("fstat");

2103

} else {

2104

if(S_ISREG(st.st_mode)

2105

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

2106

ret = fchown(pubkey_fd, uid, gid);

2107

if(ret == -1){

2108

perror_plus("fchown");

2109

}

2110

}

2111

}

2112

TEMP_FAILURE_RETRY(close(pubkey_fd));

2113

}

2114

}

2115

2116

/* Lower privileges */

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2120

perror_plus("Failed to lower privileges");

2121

}

2122

}

2123

}

2124

2125

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

2126

{

2127

char *interface = NULL;

2128

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

2129

interface))){

2130

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

2131

and if_nametoindex(interface) == 0){

2132

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

2133

fprintf_plus(stderr, "Not using nonexisting interface"

2134

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

2135

}

2136

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

2137

interface = NULL;

2138

}

2139

}

2140

}

2141

2142

/* Run network hooks */

2143

{

2144

if(mc.interfaces != NULL){

2145

interfaces_hooks = malloc(mc.interfaces_size);

2146

if(interfaces_hooks == NULL){

2147

perror_plus("malloc");

2148

goto end;

2149

}

2150

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

2151

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2152

}

2153

run_network_hooks("start", interfaces_hooks != NULL ?

2154

interfaces_hooks : "", delay);

1620

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

1621

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

1622

direntry = direntries[0];

1623

char *fullname = NULL;

1624

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

1625

if(ret < 0){

1626

perror_plus("asprintf");

1627

continue;

1628

}

1629

pid_t hook_pid = fork();

1630

if(hook_pid == 0){

1631

/* Child */

1632

dup2(devnull, STDIN_FILENO);

1633

close(devnull);

1634

dup2(STDERR_FILENO, STDOUT_FILENO);

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

exit(1);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

exit(1);

1644

}

1645

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

1646

if(ret == -1){

1647

perror_plus("setenv");

1648

exit(1);

1649

}

1650

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

1651

if(ret == -1){

1652

perror_plus("setenv");

1653

exit(1);

1654

}

1655

char *delaystring;

1656

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

1657

if(ret == -1){

1658

perror_plus("asprintf");

1659

exit(1);

1660

}

1661

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

1662

if(ret == -1){

1663

free(delaystring);

1664

perror_plus("setenv");

1665

exit(1);

1666

}

1667

free(delaystring);

1668

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

1669

perror_plus("execl");

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

free(fullname);

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

free(fullname);

1683

continue;

1684

}

1685

} else if(WIFSIGNALED(status)){

1686

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

1687

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

1688

WTERMSIG(status));

1689

free(fullname);

1690

continue;

1691

} else {

1692

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

1693

direntry->d_name);

1694

free(fullname);

1695

continue;

1696

}

1697

}

1698

free(fullname);

1699

if(quit_now){

1700

goto end;

1701

}

1702

}

1703

close(devnull);

1704

}

2155

1705

}

2156

1706

2157

1707

if(not debug){

2158

1708

avahi_set_log_function(empty_log);

2159

1709

}

2160

1710

1711

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

1712

struct dirent **direntries;

1713

/* First look for interfaces that are up */

1714

ret = scandir(sys_class_net, &direntries, up_interface,

1715

alphasort);

1716

if(ret == 0){

1717

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

1718

free(direntries);

1719

ret = scandir(sys_class_net, &direntries, good_interface,

1720

alphasort);

1721

}

1722

if(ret >= 1){

1723

/* Pick the first interface returned */

1724

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

1725

if(debug){

1726

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

1727

}

1728

if(interface == NULL){

1729

perror_plus("malloc");

1730

free(direntries);

1731

exitcode = EXIT_FAILURE;

1732

goto end;

1733

}

1734

free(direntries);

1735

} else {

1736

free(direntries);

1737

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

1738

exitcode = EXIT_FAILURE;

1739

goto end;

1740

}

1741

}

1742

2161

1743

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

2162

1744

from the signal handler */

2163

1745

/* Initialize the pseudo-RNG for Avahi */

2164

1746

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

2165

simple_poll = avahi_simple_poll_new();

2166

if(simple_poll == NULL){

2167

fprintf_plus(stderr,

2168

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

1747

mc.simple_poll = avahi_simple_poll_new();

1748

if(mc.simple_poll == NULL){

1749

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

2169

1750

exitcode = EX_UNAVAILABLE;

2170

1751

goto end;

2171

1752

}

2233

1814

}

2234

1815

}

2235

1816

2236

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

2237

if(mc.interfaces == NULL){

2238

struct dirent **direntries;

2239

/* Look for any good interfaces */

2240

ret = scandir(sys_class_net, &direntries, good_interface,

2241

alphasort);

2242

if(ret >= 1){

2243

/* Add all found interfaces to interfaces list */

2244

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

2245

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

2246

direntries[i]->d_name);

2247

if(ret_errno != 0){

2248

errno = ret_errno;

2249

perror_plus("argz_add");

2250

continue;

2251

}

2252

if(debug){

2253

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

2254

direntries[i]->d_name);

2255

}

2256

}

2257

free(direntries);

1817

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

1818

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

1819

if_index = (AvahiIfIndex) if_nametoindex(interface);

1820

if(if_index == 0){

1821

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

1822

exitcode = EX_UNAVAILABLE;

1823

goto end;

1824

}

1825

1826

if(quit_now){

1827

goto end;

1828

}

1829

1830

/* Re-raise priviliges */

1831

errno = 0;

1832

ret = seteuid(0);

1833

if(ret == -1){

1834

perror_plus("seteuid");

1835

}

1836

1837

#ifdef __linux__

1838

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1839

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

1840

ret = klogctl(8, NULL, 5);

1841

bool restore_loglevel = true;

1842

if(ret == -1){

1843

restore_loglevel = false;

1844

perror_plus("klogctl");

1845

}

1846

#endif /* __linux__ */

1847

1848

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1849

if(sd < 0){

1850

perror_plus("socket");

1851

exitcode = EX_OSERR;

1852

#ifdef __linux__

1853

if(restore_loglevel){

1854

ret = klogctl(7, NULL, 0);

1855

if(ret == -1){

1856

perror_plus("klogctl");

1857

}

1858

}

1859

#endif /* __linux__ */

1860

/* Lower privileges */

1861

errno = 0;

1862

ret = seteuid(uid);

1863

if(ret == -1){

1864

perror_plus("seteuid");

1865

}

1866

goto end;

1867

}

1868

strcpy(network.ifr_name, interface);

1869

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

1870

if(ret == -1){

1871

perror_plus("ioctl SIOCGIFFLAGS");

1872

#ifdef __linux__

1873

if(restore_loglevel){

1874

ret = klogctl(7, NULL, 0);

1875

if(ret == -1){

1876

perror_plus("klogctl");

1877

}

1878

}

1879

#endif /* __linux__ */

1880

exitcode = EX_OSERR;

1881

/* Lower privileges */

1882

errno = 0;

1883

ret = seteuid(uid);

1884

if(ret == -1){

1885

perror_plus("seteuid");

1886

}

1887

goto end;

1888

}

1889

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

1890

network.ifr_flags |= IFF_UP;

1891

take_down_interface = true;

1892

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

1893

if(ret == -1){

1894

take_down_interface = false;

1895

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1896

exitcode = EX_OSERR;

1897

#ifdef __linux__

1898

if(restore_loglevel){

1899

ret = klogctl(7, NULL, 0);

1900

if(ret == -1){

1901

perror_plus("klogctl");

1902

}

1903

}

1904

#endif /* __linux__ */

1905

/* Lower privileges */

1906

errno = 0;

1907

ret = seteuid(uid);

1908

if(ret == -1){

1909

perror_plus("seteuid");

1910

}

1911

goto end;

1912

}

1913

}

1914

/* Sleep checking until interface is running.

1915

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

1916

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

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCGIFFLAGS");

1920

} else if(network.ifr_flags & IFF_RUNNING){

1921

break;

1922

}

1923

struct timespec sleeptime = { .tv_nsec = 250000000 };

1924

ret = nanosleep(&sleeptime, NULL);

1925

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

1926

perror_plus("nanosleep");

1927

}

1928

}

1929

if(not take_down_interface){

1930

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

1931

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

1932

if(ret == -1){

1933

perror_plus("close");

1934

}

1935

}

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

/* Restores kernel loglevel to default */

1939

ret = klogctl(7, NULL, 0);

1940

if(ret == -1){

1941

perror_plus("klogctl");

1942

}

1943

}

1944

#endif /* __linux__ */

1945

/* Lower privileges */

1946

errno = 0;

1947

if(take_down_interface){

1948

/* Lower privileges */

1949

ret = seteuid(uid);

1950

if(ret == -1){

1951

perror_plus("seteuid");

1952

}

2258

1953

} else {

2259

free(direntries);

2260

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

2261

exitcode = EXIT_FAILURE;

2262

goto end;

2263

}

2264

}

2265

2266

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

2267

{

2268

char *interface = NULL;

2269

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

2270

interface))){

2271

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

2272

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

2273

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

2274

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

2275

interface);

2276

interface = NULL;

2277

while((interface = argz_next(mc.interfaces,

2278

mc.interfaces_size, interface))){

2279

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

2280

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

2281

interface);

2282

interface = NULL;

2283

}

2284

}

2285

break;

2286

}

2287

bool interface_was_up = interface_is_up(interface);

2288

errno = bring_up_interface(interface, delay);

2289

if(not interface_was_up){

2290

if(errno != 0){

2291

perror_plus("Failed to bring up interface");

2292

} else {

2293

errno = argz_add(&interfaces_to_take_down,

2294

&interfaces_to_take_down_size,

2295

interface);

2296

if(errno != 0){

2297

perror_plus("argz_add");

2298

}

2299

}

2300

}

2301

}

2302

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

2303

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

2304

}

2305

}

2306

2307

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

2308

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

2309

if(debug){

2310

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

2311

mc.interfaces);

2312

}

2313

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

1954

/* Lower privileges permanently */

1955

ret = setuid(uid);

1956

if(ret == -1){

1957

perror_plus("setuid");

1958

}

1959

}

2314

1960

}

2315

1961

2316

1962

if(quit_now){

2317

1963

goto end;

2318

1964

}

2319

1965

2320

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

1966

ret = init_gnutls_global(pubkey, seckey);

2321

1967

if(ret == -1){

2322

1968

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

2323

1969

exitcode = EX_UNAVAILABLE;

2330

1976

goto end;

2331

1977

}

2332

1978

2333

/* Try /run/tmp before /tmp */

2334

tempdir = mkdtemp(run_tempdir);

2335

if(tempdir == NULL and errno == ENOENT){

2336

if(debug){

2337

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2338

run_tempdir, old_tempdir);

2339

}

2340

tempdir = mkdtemp(old_tempdir);

2341

}

2342

if(tempdir == NULL){

1979

if(mkdtemp(tempdir) == NULL){

2343

1980

perror_plus("mkdtemp");

2344

1981

goto end;

2345

1982

}

1983

tempdir_created = true;

2346

1984

2347

1985

if(quit_now){

2348

1986

goto end;

2349

1987

}

2350

1988

2351

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

1989

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

2352

1990

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

2353

1991

exitcode = EX_UNAVAILABLE;

2354

1992

goto end;

2364

2002

/* Connect directly, do not use Zeroconf */

2365

2003

/* (Mainly meant for debugging) */

2366

2004

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

2367

2368

2005

if(address == NULL){

2369

2006

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

2370

2007

exitcode = EX_USAGE;

2375

2012

goto end;

2376

2013

}

2377

2014

2378

in_port_t port;

2015

uint16_t port;

2379

2016

errno = 0;

2380

2017

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

2381

2018

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

2382

or tmpmax != (in_port_t)tmpmax){

2019

or tmpmax != (uint16_t)tmpmax){

2383

2020

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

2384

2021

exitcode = EX_USAGE;

2385

2022

goto end;

2386

2023

}

2387

2024

2388

2025

if(quit_now){

2389

2026

goto end;

2390

2027

}

2391

2028

2392

port = (in_port_t)tmpmax;

2029

port = (uint16_t)tmpmax;

2393

2030

*address = '\0';

2394

2031

/* Colon in address indicates IPv6 */

2395

2032

int af;

2411

2048

}

2412

2049

2413

2050

while(not quit_now){

2414

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

2415

&mc);

2051

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

2416

2052

if(quit_now or ret == 0){

2417

2053

break;

2418

2054

}

2419

2055

if(debug){

2420

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

2421

(int)retry_interval);

2056

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

2422

2057

}

2423

sleep((unsigned int)retry_interval);

2058

sleep((int)retry_interval);

2424

2059

}

2425

2060

2426

if(not quit_now){

2061

if (not quit_now){

2427

2062

exitcode = EXIT_SUCCESS;

2428

2063

}

2429

2064

2444

2079

config.publish_domain = 0;

2445

2080

2446

2081

/* Allocate a new server */

2447

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2448

&config, NULL, NULL, &ret_errno);

2082

mc.server = avahi_server_new(avahi_simple_poll_get

2083

(mc.simple_poll), &config, NULL,

2084

NULL, &error);

2449

2085

2450

2086

/* Free the Avahi configuration data */

2451

2087

avahi_server_config_free(&config);

2454

2090

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

2455

2091

if(mc.server == NULL){

2456

2092

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

2457

avahi_strerror(ret_errno));

2093

avahi_strerror(error));

2458

2094

exitcode = EX_UNAVAILABLE;

2459

2095

goto end;

2460

2096

}

2466

2102

/* Create the Avahi service browser */

2467

2103

sb = avahi_s_service_browser_new(mc.server, if_index,

2468

2104

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2469

NULL, 0, browse_callback,

2470

(void *)&mc);

2105

NULL, 0, browse_callback, NULL);

2471

2106

if(sb == NULL){

2472

2107

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

2473

avahi_strerror(avahi_server_errno(mc.server)));

2108

avahi_strerror(avahi_server_errno(mc.server)));

2474

2109

exitcode = EX_UNAVAILABLE;

2475

2110

goto end;

2476

2111

}

2485

2120

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

2486

2121

}

2487

2122

2488

ret = avahi_loop_with_timeout(simple_poll,

2489

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

2123

ret = avahi_loop_with_timeout(mc.simple_poll,

2124

(int)(retry_interval * 1000));

2490

2125

if(debug){

2491

2126

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

2492

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

2127

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

2493

2128

}

2494

2129

2495

2130

end:

2499

2134

}

2500

2135

2501

2136

/* Cleanup things */

2502

free(mc.interfaces);

2503

2504

2137

if(sb != NULL)

2505

2138

avahi_s_service_browser_free(sb);

2506

2139

2507

2140

if(mc.server != NULL)

2508

2141

avahi_server_free(mc.server);

2509

2142

2510

if(simple_poll != NULL)

2511

avahi_simple_poll_free(simple_poll);

2143

if(mc.simple_poll != NULL)

2144

avahi_simple_poll_free(mc.simple_poll);

2512

2145

2513

2146

if(gnutls_initialized){

2514

2147

gnutls_certificate_free_credentials(mc.cred);

2519

2152

if(gpgme_initialized){

2520

2153

gpgme_release(mc.ctx);

2521

2154

}

2522

2155

2523

2156

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

2524

2157

has seen */

2525

2158

if(mc.current_server != NULL){

2531

2164

}

2532

2165

}

2533

2166

2534

/* Re-raise privileges */

2535

{

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

2538

perror_plus("Failed to raise privileges");

2539

} else {

2540

2541

/* Run network hooks */

2542

run_network_hooks("stop", interfaces_hooks != NULL ?

2543

interfaces_hooks : "", delay);

2544

2545

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

2546

{

2547

char *interface = NULL;

2548

while((interface=argz_next(interfaces_to_take_down,

2549

interfaces_to_take_down_size,

2550

interface))){

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

2554

perror_plus("Failed to take down interface");

2555

}

2556

}

2557

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

2558

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

2559

" down\n");

2560

}

2561

}

2167

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

2168

2169

/* Take down the network interface */

2170

if(take_down_interface){

2171

/* Re-raise priviliges */

2172

errno = 0;

2173

ret = seteuid(0);

2174

if(ret == -1){

2175

perror_plus("seteuid");

2562

2176

}

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

2565

perror_plus("Failed to lower privileges permanently");

2177

if(geteuid() == 0){

2178

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

2179

if(ret == -1){

2180

perror_plus("ioctl SIOCGIFFLAGS");

2181

} else if(network.ifr_flags & IFF_UP){

2182

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

2183

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

2184

if(ret == -1){

2185

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2186

}

2187

}

2188

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

2189

if(ret == -1){

2190

perror_plus("close");

2191

}

2192

/* Lower privileges permanently */

2193

errno = 0;

2194

ret = setuid(uid);

2195

if(ret == -1){

2196

perror_plus("setuid");

2197

}

2566

2198

}

2567

2199

}

2568

2200

2569

free(interfaces_to_take_down);

2570

free(interfaces_hooks);

2571

2572

2201

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

2573

if(tempdir != NULL){

2202

if(tempdir_created){

2574

2203

struct dirent **direntries = NULL;

2575

2204

struct dirent *direntry = NULL;

2576

2205

int numentries = scandir(tempdir, &direntries, notdotentries,

2577

2206

alphasort);

2578

if(numentries > 0){

2207

if (numentries > 0){

2579

2208

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

2580

2209

direntry = direntries[i];

2581

2210

char *fullname = NULL;

2587

2216

}

2588

2217

ret = remove(fullname);

2589

2218

if(ret == -1){

2590

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

2591

strerror(errno));

2219

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

2592

2220

}

2593

2221

free(fullname);

2594

2222

}

2596

2224

2597

2225

/* need to clean even if 0 because man page doesn't specify */

2598

2226

free(direntries);

2599

if(numentries == -1){

2227

if (numentries == -1){

2600

2228

perror_plus("scandir");

2601

2229

}

2602

2230

ret = rmdir(tempdir);