/mandos/trunk : revision 662

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

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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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}

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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, 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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.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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243

}

237

return 0;

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return true;

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245

}

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/*

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* Initialize GPGME.

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*/

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

244

const char *tempdir){

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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253

gpgme_engine_info_t engine_info;

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254

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/*

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

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257

*/

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273

return false;

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274

}

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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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}

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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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*/

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

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data buffer */

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

380

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

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if(debug){

379

386

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

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result = gpgme_op_decrypt_result(mc->ctx);

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if(result == NULL){

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

383

390

} else {

461

468

}

462

469

463

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static const char * safer_gnutls_strerror(int value){

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

465

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

466

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if(ret == NULL)

467

473

ret = "(unknown)";

468

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return ret;

475

481

}

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static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

479

486

int ret;

480

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481

488

if(debug){

498

505

}

499

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500

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/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

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if(ret != GNUTLS_E_SUCCESS){

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

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safer_gnutls_strerror(ret));

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}

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ret = gnutls_certificate_set_openpgp_key_file

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(mc.cred, pubkeyfilename, seckeyfilename,

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(mc->cred, pubkeyfilename, seckeyfilename,

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GNUTLS_OPENPGP_FMT_BASE64);

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if(ret != GNUTLS_E_SUCCESS){

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fprintf_plus(stderr,

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533

}

527

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/* GnuTLS server initialization */

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ret = gnutls_dh_params_init(&mc.dh_params);

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ret = gnutls_dh_params_init(&mc->dh_params);

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if(ret != GNUTLS_E_SUCCESS){

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fprintf_plus(stderr, "Error in GnuTLS DH parameter"

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539

" initialization: %s\n",

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540

safer_gnutls_strerror(ret));

534

541

goto globalfail;

535

542

}

536

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

543

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

537

544

if(ret != GNUTLS_E_SUCCESS){

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

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safer_gnutls_strerror(ret));

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goto globalfail;

541

548

}

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gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

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return 0;

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globalfail:

548

555

549

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

550

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gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

552

559

return -1;

553

560

}

554

561

555

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

556

564

int ret;

557

565

/* GnuTLS session creation */

558

566

do {

570

578

{

571

579

const char *err;

572

580

do {

573

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

581

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

574

582

if(quit_now){

575

583

gnutls_deinit(*session);

576

584

return -1;

587

595

588

596

do {

589

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

598

mc->cred);

591

599

if(quit_now){

592

600

gnutls_deinit(*session);

593

601

return -1;

603

611

/* ignore client certificate if any. */

604

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

613

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

615

608

616

return 0;

609

617

}

613

621

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

614

622

615

623

/* Called when a Mandos server is found */

616

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

624

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

617

625

AvahiIfIndex if_index,

618

int af){

626

int af, mandos_context *mc){

619

627

int ret, tcp_sd = -1;

620

628

ssize_t sret;

621

629

union {

651

659

return -1;

652

660

}

653

661

654

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);

655

695

if(ret != 0){

656

696

return -1;

657

697

}

658

698

659

699

if(debug){

660

700

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

661

PRIu16 "\n", ip, port);

701

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

662

702

}

663

703

664

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

695

735

goto mandos_end;

696

736

}

697

737

if(af == AF_INET6){

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

702

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

705

748

if(if_index == AVAHI_IF_UNSPEC){

706

749

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

707

750

" incomplete without a network interface\n");

712

755

to.in6.sin6_scope_id = (uint32_t)if_index;

713

756

}

714

757

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

758

to.in.sin_port = htons(port);

718

759

}

719

760

720

761

if(quit_now){

728

769

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

729

770

perror_plus("if_indextoname");

730

771

} else {

731

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

732

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

772

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

773

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

733

774

}

734

775

} else {

735

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

736

ip, port);

776

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

777

ip, (uintmax_t)port);

737

778

}

738

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

817

858

goto mandos_end;

818

859

}

819

860

820

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

821

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);

822

866

823

867

if(quit_now){

824

868

errno = EINTR;

929

973

if(buffer_length > 0){

930

974

ssize_t decrypted_buffer_size;

931

975

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

976

&decrypted_buffer, mc);

933

977

if(decrypted_buffer_size >= 0){

934

978

935

979

written = 0;

996

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1042

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1001

1047

1002

1048

/* Called whenever a service has been resolved successfully or

1003

1049

timed out */

1012

1058

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

1013

1059

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

1014

1060

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1061

avahi_strerror(avahi_server_errno

1062

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

1016

1063

break;

1017

1064

1018

1065

case AVAHI_RESOLVER_FOUND:

1024

1071

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

1025

1072

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

1026

1073

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

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);

1029

1078

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1031

1080

} else {

1032

ret = add_server(ip, port, interface,

1033

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

}

1034

1087

}

1035

1088

}

1036

1089

}

1046

1099

const char *domain,

1047

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1101

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1051

1106

1052

1107

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

1053

1108

is removed from the LAN */

1061

1116

case AVAHI_BROWSER_FAILURE:

1062

1117

1063

1118

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1119

avahi_strerror(avahi_server_errno

1120

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

1121

avahi_simple_poll_quit(simple_poll);

1066

1122

return;

1067

1123

1068

1124

case AVAHI_BROWSER_NEW:

1071

1127

the callback function is called the Avahi server will free the

1072

1128

resolver for us. */

1073

1129

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

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)

1077

1134

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

1078

1135

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1136

avahi_strerror(avahi_server_errno

1137

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

1080

1138

break;

1081

1139

1082

1140

case AVAHI_BROWSER_REMOVE:

1101

1159

signal_received = sig;

1102

1160

int old_errno = errno;

1103

1161

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1106

1164

}

1107

1165

errno = old_errno;

1108

1166

}

1109

1167

1110

1168

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

1111

1169

int ret;

1170

error_t ret_errno;

1112

1171

1113

1172

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

1114

1173

if(s < 0){

1174

ret_errno = errno;

1115

1175

perror_plus("socket");

1176

errno = ret_errno;

1116

1177

return false;

1117

1178

}

1118

1179

strcpy(ifr->ifr_name, ifname);

1119

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1181

if(ret == -1){

1121

1182

if(debug){

1183

ret_errno = errno;

1122

1184

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1123

1186

}

1124

1187

return false;

1125

1188

}

1194

1257

}

1195

1258

1196

1259

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

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);

1237

1289

}

1238

1290

1239

1291

int notdotentries(const struct dirent *direntry){

1301

1353

}

1302

1354

return 0;

1303

1355

}

1356

if(debug){

1357

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

1358

direntry->d_name);

1359

}

1304

1360

return 1;

1305

1361

}

1306

1362

1307

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){

1308

1365

int ret;

1309

1366

struct timespec now;

1310

1367

struct timespec waited_time;

1311

1368

intmax_t block_time;

1312

1369

1313

1370

while(true){

1314

if(mc.current_server == NULL){

1371

if(mc->current_server == NULL){

1315

1372

if (debug){

1316

1373

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

1317

1374

" No timeout!\n");

1331

1388

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

1332

1389

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

1333

1390

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1391

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

1335

1392

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1393

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

1337

1394

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

1338

1395

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

1339

1396

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

1347

1404

}

1348

1405

1349

1406

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

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);

1354

1411

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1412

avahi_simple_poll_quit(s);

1356

1413

return 0;

1357

1414

}

1358

1415

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1416

&mc->current_server->last_seen);

1360

1417

if(ret == -1){

1361

1418

perror_plus("clock_gettime");

1362

1419

return -1;

1363

1420

}

1364

mc.current_server = mc.current_server->next;

1421

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

1365

1422

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

1366

1423

servers, but don't block */

1367

1424

}

1376

1433

}

1377

1434

}

1378

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

1379

1488

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

1380

1489

const float delay){

1381

1490

struct dirent **direntries;

1384

1493

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

1385

1494

alphasort);

1386

1495

if(numhooks == -1){

1387

perror_plus("scandir");

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

}

1388

1504

} else {

1389

1505

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

1390

1506

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

1402

1518

pid_t hook_pid = fork();

1403

1519

if(hook_pid == 0){

1404

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

}

1405

1535

dup2(devnull, STDIN_FILENO);

1406

1536

close(devnull);

1407

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1408

1538

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

1409

1539

if(ret == -1){

1410

1540

perror_plus("setenv");

1411

return false;

1541

_exit(EX_OSERR);

1412

1542

}

1413

1543

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

1414

1544

if(ret == -1){

1415

1545

perror_plus("setenv");

1416

return false;

1546

_exit(EX_OSERR);

1417

1547

}

1418

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

1548

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

1419

1549

if(ret == -1){

1420

1550

perror_plus("setenv");

1421

return false;

1551

_exit(EX_OSERR);

1422

1552

}

1423

1553

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

1424

1554

if(ret == -1){

1425

1555

perror_plus("setenv");

1426

return false;

1556

_exit(EX_OSERR);

1427

1557

}

1428

1558

char *delaystring;

1429

1559

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

1430

1560

if(ret == -1){

1431

1561

perror_plus("asprintf");

1432

return false;

1562

_exit(EX_OSERR);

1433

1563

}

1434

1564

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

1435

1565

if(ret == -1){

1436

1566

free(delaystring);

1437

1567

perror_plus("setenv");

1438

return false;

1568

_exit(EX_OSERR);

1439

1569

}

1440

1570

free(delaystring);

1441

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

1442

perror_plus("execl");

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

}

1443

1582

} else {

1444

1583

int status;

1445

1584

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

1469

1608

}

1470

1609

}

1471

1610

free(fullname);

1472

if(quit_now){

1473

break;

1611

if(debug){

1612

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

1613

direntry->d_name);

1474

1614

}

1475

1615

}

1476

1616

close(devnull);

1478

1618

return true;

1479

1619

}

1480

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

1481

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 };

1482

1798

AvahiSServiceBrowser *sb = NULL;

1483

int error;

1799

error_t ret_errno;

1484

1800

int ret;

1485

1801

intmax_t tmpmax;

1486

1802

char *tmp;

1487

1803

int exitcode = EXIT_SUCCESS;

1488

const char *interface = "";

1489

struct ifreq network;

1490

int sd = -1;

1491

bool take_down_interface = false;

1492

uid_t uid;

1493

gid_t gid;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1494

1806

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

1495

1807

bool tempdir_created = false;

1496

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1497

1809

const char *seckey = PATHDIR "/" SECKEY;

1498

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1499

1813

1500

1814

bool gnutls_initialized = false;

1501

1815

bool gpgme_initialized = false;

1563

1877

.group = 2 },

1564

1878

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

1565

1879

.arg = "SECONDS",

1566

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

1880

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

1567

1881

.group = 2 },

1568

1882

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

1569

1883

.arg = "DIR",

1592

1906

connect_to = arg;

1593

1907

break;

1594

1908

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

1595

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

}

1596

1914

break;

1597

1915

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

1598

1916

seckey = arg;

1641

1959

argp_state_help(state, state->out_stream,

1642

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1643

1961

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1646

1962

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

1647

1963

exit(argp_err_exit_status);

1648

1964

break;

1673

1989

}

1674

1990

}

1675

1991

1676

if(getuid() == 0){

1992

{

1677

1993

/* Work around Debian bug #633582:

1678

1994

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

1679

struct stat st;

1680

1995

1681

1996

/* Re-raise priviliges */

1682

errno = 0;

1683

ret = seteuid(0);

1684

if(ret == -1){

1685

perror_plus("seteuid");

1686

}

1687

1688

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

1689

int seckey_fd = open(seckey, O_RDONLY);

1690

if(seckey_fd == -1){

1691

perror_plus("open");

1692

} else {

1693

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

1694

if(ret == -1){

1695

perror_plus("fstat");

1696

} else {

1697

if(S_ISREG(st.st_mode)

1698

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

1699

ret = fchown(seckey_fd, uid, gid);

1700

if(ret == -1){

1701

perror_plus("fchown");

1702

}

1703

}

1704

}

1705

TEMP_FAILURE_RETRY(close(seckey_fd));

1706

}

1707

}

1708

1709

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

1710

int pubkey_fd = open(pubkey, O_RDONLY);

1711

if(pubkey_fd == -1){

1712

perror_plus("open");

1713

} else {

1714

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

1715

if(ret == -1){

1716

perror_plus("fstat");

1717

} else {

1718

if(S_ISREG(st.st_mode)

1719

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

1720

ret = fchown(pubkey_fd, uid, gid);

1721

if(ret == -1){

1722

perror_plus("fchown");

1723

}

1724

}

1725

}

1726

TEMP_FAILURE_RETRY(close(pubkey_fd));

1727

}

1728

}

1729

1730

/* Lower privileges */

1731

errno = 0;

1732

ret = seteuid(uid);

1733

if(ret == -1){

1734

perror_plus("seteuid");

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

}

1735

2061

}

1736

2062

}

1737

2063

1738

2064

/* Run network hooks */

1739

2065

{

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

1746

2071

}

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)',');

1747

2076

}

1748

if(not run_network_hooks("start", interface, delay)){

2077

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

2078

interfaces_hooks : "", delay)){

1749

2079

goto end;

1750

2080

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1758

}

1759

2081

}

1760

2082

1761

2083

if(not debug){

1762

2084

avahi_set_log_function(empty_log);

1763

2085

}

1764

2086

1765

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

1766

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

if(ret >= 1){

1777

/* Pick the first interface returned */

1778

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

1779

if(debug){

1780

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

1781

}

1782

if(interface == NULL){

1783

perror_plus("malloc");

1784

free(direntries);

1785

exitcode = EXIT_FAILURE;

1786

goto end;

1787

}

1788

free(direntries);

1789

} else {

1790

free(direntries);

1791

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

1792

exitcode = EXIT_FAILURE;

1793

goto end;

1794

}

1795

}

1796

1797

2087

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

1798

2088

from the signal handler */

1799

2089

/* Initialize the pseudo-RNG for Avahi */

1800

2090

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

1801

mc.simple_poll = avahi_simple_poll_new();

1802

if(mc.simple_poll == NULL){

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

1803

2093

fprintf_plus(stderr,

1804

2094

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

1805

2095

exitcode = EX_UNAVAILABLE;

1869

2159

}

1870

2160

}

1871

2161

1872

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

1873

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

1874

if_index = (AvahiIfIndex) if_nametoindex(interface);

1875

if(if_index == 0){

1876

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

1877

exitcode = EX_UNAVAILABLE;

1878

goto end;

1879

}

1880

1881

if(quit_now){

1882

goto end;

1883

}

1884

1885

/* Re-raise priviliges */

1886

errno = 0;

1887

ret = seteuid(0);

1888

if(ret == -1){

1889

perror_plus("seteuid");

1890

}

1891

1892

#ifdef __linux__

1893

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1894

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

1895

ret = klogctl(8, NULL, 5);

1896

bool restore_loglevel = true;

1897

if(ret == -1){

1898

restore_loglevel = false;

1899

perror_plus("klogctl");

1900

}

1901

#endif /* __linux__ */

1902

1903

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1904

if(sd < 0){

1905

perror_plus("socket");

1906

exitcode = EX_OSERR;

1907

#ifdef __linux__

1908

if(restore_loglevel){

1909

ret = klogctl(7, NULL, 0);

1910

if(ret == -1){

1911

perror_plus("klogctl");

1912

}

1913

}

1914

#endif /* __linux__ */

1915

/* Lower privileges */

1916

errno = 0;

1917

ret = seteuid(uid);

1918

if(ret == -1){

1919

perror_plus("seteuid");

1920

}

1921

goto end;

1922

}

1923

strcpy(network.ifr_name, interface);

1924

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

1925

if(ret == -1){

1926

perror_plus("ioctl SIOCGIFFLAGS");

1927

#ifdef __linux__

1928

if(restore_loglevel){

1929

ret = klogctl(7, NULL, 0);

1930

if(ret == -1){

1931

perror_plus("klogctl");

1932

}

1933

}

1934

#endif /* __linux__ */

1935

exitcode = EX_OSERR;

1936

/* Lower privileges */

1937

errno = 0;

1938

ret = seteuid(uid);

1939

if(ret == -1){

1940

perror_plus("seteuid");

1941

}

1942

goto end;

1943

}

1944

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

1945

network.ifr_flags |= IFF_UP;

1946

take_down_interface = true;

1947

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

1948

if(ret == -1){

1949

take_down_interface = false;

1950

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1951

exitcode = EX_OSERR;

1952

#ifdef __linux__

1953

if(restore_loglevel){

1954

ret = klogctl(7, NULL, 0);

1955

if(ret == -1){

1956

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;

1957

2208

}

1958

2209

}

1959

#endif /* __linux__ */

1960

/* Lower privileges */

1961

errno = 0;

1962

ret = seteuid(uid);

1963

if(ret == -1){

1964

perror_plus("seteuid");

1965

}

1966

goto end;

1967

}

1968

}

1969

/* Sleep checking until interface is running.

1970

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

1971

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

1972

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

1973

if(ret == -1){

1974

perror_plus("ioctl SIOCGIFFLAGS");

1975

} else if(network.ifr_flags & IFF_RUNNING){

1976

2210

break;

1977

2211

}

1978

struct timespec sleeptime = { .tv_nsec = 250000000 };

1979

ret = nanosleep(&sleeptime, NULL);

1980

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

1981

perror_plus("nanosleep");

1982

}

1983

}

1984

if(not take_down_interface){

1985

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

1986

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

1987

if(ret == -1){

1988

perror_plus("close");

1989

}

1990

}

1991

#ifdef __linux__

1992

if(restore_loglevel){

1993

/* Restores kernel loglevel to default */

1994

ret = klogctl(7, NULL, 0);

1995

if(ret == -1){

1996

perror_plus("klogctl");

1997

}

1998

}

1999

#endif /* __linux__ */

2000

/* Lower privileges */

2001

errno = 0;

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

2006

}

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);

2007

2237

}

2008

2238

2009

2239

if(quit_now){

2010

2240

goto end;

2011

2241

}

2012

2242

2013

ret = init_gnutls_global(pubkey, seckey);

2243

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

2014

2244

if(ret == -1){

2015

2245

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

2016

2246

exitcode = EX_UNAVAILABLE;

2033

2263

goto end;

2034

2264

}

2035

2265

2036

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

2266

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

2037

2267

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

2038

2268

exitcode = EX_UNAVAILABLE;

2039

2269

goto end;

2049

2279

/* Connect directly, do not use Zeroconf */

2050

2280

/* (Mainly meant for debugging) */

2051

2281

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

2282

2052

2283

if(address == NULL){

2053

2284

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

2054

2285

exitcode = EX_USAGE;

2059

2290

goto end;

2060

2291

}

2061

2292

2062

uint16_t port;

2293

in_port_t port;

2063

2294

errno = 0;

2064

2295

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

2065

2296

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

2066

or tmpmax != (uint16_t)tmpmax){

2297

or tmpmax != (in_port_t)tmpmax){

2067

2298

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

2068

2299

exitcode = EX_USAGE;

2069

2300

goto end;

2070

2301

}

2071

2302

2072

2303

if(quit_now){

2073

2304

goto end;

2074

2305

}

2075

2306

2076

port = (uint16_t)tmpmax;

2307

port = (in_port_t)tmpmax;

2077

2308

*address = '\0';

2078

2309

/* Colon in address indicates IPv6 */

2079

2310

int af;

2095

2326

}

2096

2327

2097

2328

while(not quit_now){

2098

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

2329

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

2330

&mc);

2099

2331

if(quit_now or ret == 0){

2100

2332

break;

2101

2333

}

2103

2335

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

2104

2336

(int)retry_interval);

2105

2337

}

2106

sleep((int)retry_interval);

2338

sleep((unsigned int)retry_interval);

2107

2339

}

2108

2340

2109

2341

if (not quit_now){

2127

2359

config.publish_domain = 0;

2128

2360

2129

2361

/* Allocate a new server */

2130

mc.server = avahi_server_new(avahi_simple_poll_get

2131

(mc.simple_poll), &config, NULL,

2132

NULL, &error);

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2133

2364

2134

2365

/* Free the Avahi configuration data */

2135

2366

avahi_server_config_free(&config);

2138

2369

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

2139

2370

if(mc.server == NULL){

2140

2371

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

2141

avahi_strerror(error));

2372

avahi_strerror(ret_errno));

2142

2373

exitcode = EX_UNAVAILABLE;

2143

2374

goto end;

2144

2375

}

2150

2381

/* Create the Avahi service browser */

2151

2382

sb = avahi_s_service_browser_new(mc.server, if_index,

2152

2383

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2153

NULL, 0, browse_callback, NULL);

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2154

2386

if(sb == NULL){

2155

2387

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

2156

2388

avahi_strerror(avahi_server_errno(mc.server)));

2168

2400

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

2169

2401

}

2170

2402

2171

ret = avahi_loop_with_timeout(mc.simple_poll,

2172

(int)(retry_interval * 1000));

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2173

2405

if(debug){

2174

2406

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

2175

2407

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

2182

2414

}

2183

2415

2184

2416

/* Cleanup things */

2417

free(mc.interfaces);

2418

2185

2419

if(sb != NULL)

2186

2420

avahi_s_service_browser_free(sb);

2187

2421

2188

2422

if(mc.server != NULL)

2189

2423

avahi_server_free(mc.server);

2190

2424

2191

if(mc.simple_poll != NULL)

2192

avahi_simple_poll_free(mc.simple_poll);

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2193

2427

2194

2428

if(gnutls_initialized){

2195

2429

gnutls_certificate_free_credentials(mc.cred);

2200

2434

if(gpgme_initialized){

2201

2435

gpgme_release(mc.ctx);

2202

2436

}

2203

2437

2204

2438

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

2205

2439

has seen */

2206

2440

if(mc.current_server != NULL){

2214

2448

2215

2449

/* Re-raise priviliges */

2216

2450

{

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2451

raise_privileges();

2452

2224

2453

/* Run network hooks */

2225

if(not run_network_hooks("stop", interface, delay)){

2226

goto end;

2227

}

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2228

2456

2229

/* Take down the network interface */

2230

if(take_down_interface and geteuid() == 0){

2231

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

2232

if(ret == -1){

2233

perror_plus("ioctl SIOCGIFFLAGS");

2234

} else if(network.ifr_flags & IFF_UP){

2235

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

2236

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

2237

if(ret == -1){

2238

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

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");

2239

2467

}

2240

2468

}

2241

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

2242

if(ret == -1){

2243

perror_plus("close");

2469

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

2470

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

2471

" down\n");

2244

2472

}

2245

2473

}

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

2253

}

2254

}

2474

2475

lower_privileges_permanently();

2476

}

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2255

2480

2256

2481

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

2257

2482

if(tempdir_created){