/mandos/trunk : revision 24.1.124

1

/* -*- coding: utf-8 -*- */

2

/*

3

* Mandos client - get and decrypt data from a Mandos server

3

* Mandos-client - get and decrypt data from a Mandos server

4

*

5

* This program is partly derived from an example program for an Avahi

6

* service browser, downloaded from

9

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

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*

11

* Everything else is

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13

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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

35

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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

38

stdout, ferror() */

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stdout, ferror(), sscanf */

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40

#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, EXIT_FAILURE,

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, INET6_ADDRSTRLEN,

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uid_t, gid_t, open(), opendir(), DIR */

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uid_t, gid_t, open(), opendir(),

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DIR */

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

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

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struct in6_addr, inet_pton(),

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connect() */

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

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

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#include <inttypes.h> /* PRIu16 */

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

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*/

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

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

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62

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

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

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

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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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getuid(), getgid(), setuid(),

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setgid() */

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

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

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

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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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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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

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/* Avahi */

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/* All Avahi types, constants and functions

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gnutls_*

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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133

*/

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size_t adjustbuffer(char **buffer, size_t buffer_length,

130

135

size_t buffer_capacity){

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if (buffer_length + BUFFER_SIZE > buffer_capacity){

136

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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137

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

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if (buffer == NULL){

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if(buffer == NULL){

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return 0;

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}

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buffer_capacity += BUFFER_SIZE;

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int fd;

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gpgme_data_t pgp_data;

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fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

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if(fd == -1){

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perror("open");

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return false;

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}

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168

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if (rc != GPG_ERR_NO_ERROR){

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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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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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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ret = TEMP_FAILURE_RETRY(close(fd));

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

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if(ret == -1){

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perror("close");

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}

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return true;

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}

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if (debug){

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if(debug){

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fprintf(stderr, "Initialize gpgme\n");

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193

}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if (rc != GPG_ERR_NO_ERROR){

198

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_get_engine_info (&engine_info);

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if (rc != GPG_ERR_NO_ERROR){

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rc = gpgme_get_engine_info(&engine_info);

206

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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/* Create new GPGME "context" */

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

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if (rc != GPG_ERR_NO_ERROR){

226

if(rc != GPG_ERR_NO_ERROR){

222

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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231

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if (not import_key(pubkey) or not import_key(seckey)){

232

if(not import_key(pubkey) or not import_key(seckey)){

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return false;

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}

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235

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* Decrypt OpenPGP data.

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* Returns -1 on error

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*/

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static ssize_t pgp_packet_decrypt (const mandos_context *mc,

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const char *cryptotext,

240

size_t crypto_size,

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char **plaintext){

243

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

244

const char *cryptotext,

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size_t crypto_size,

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char **plaintext){

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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ssize_t ret;

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size_t plaintext_capacity = 0;

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ssize_t plaintext_length = 0;

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252

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if (debug){

253

if(debug){

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

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}

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

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

254

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0);

255

if (rc != GPG_ERR_NO_ERROR){

260

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

260

265

261

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

262

267

rc = gpgme_data_new(&dh_plain);

263

if (rc != GPG_ERR_NO_ERROR){

268

if(rc != GPG_ERR_NO_ERROR){

264

269

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

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gpgme_strsource(rc), gpgme_strerror(rc));

266

271

gpgme_data_release(dh_crypto);

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

271

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data buffer */

272

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

273

if (rc != GPG_ERR_NO_ERROR){

278

if(rc != GPG_ERR_NO_ERROR){

274

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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281

plaintext_length = -1;

277

if (debug){

282

if(debug){

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283

gpgme_decrypt_result_t result;

279

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result = gpgme_op_decrypt_result(mc->ctx);

280

if (result == NULL){

285

if(result == NULL){

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286

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

282

287

} else {

283

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

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315

}

311

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312

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

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if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){

318

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

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perror("gpgme_data_seek");

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plaintext_length = -1;

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goto decrypt_end;

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plaintext_capacity = adjustbuffer(plaintext,

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(size_t)plaintext_length,

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plaintext_capacity);

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if (plaintext_capacity == 0){

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if(plaintext_capacity == 0){

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perror("adjustbuffer");

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plaintext_length = -1;

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goto decrypt_end;

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ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

331

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BUFFER_SIZE);

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/* Print the data, if any */

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if (ret == 0){

338

if(ret == 0){

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/* EOF */

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break;

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}

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return plaintext_length;

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}

362

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363

static const char * safer_gnutls_strerror (int value) {

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

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if (ret == NULL)

368

static const char * safer_gnutls_strerror(int value) {

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

370

-Wunreachable-code */

371

if(ret == NULL)

366

372

ret = "(unknown)";

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return ret;

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}

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}

384

390

385

391

ret = gnutls_global_init();

386

if (ret != GNUTLS_E_SUCCESS) {

387

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

388

safer_gnutls_strerror(ret));

392

if(ret != GNUTLS_E_SUCCESS) {

393

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

394

safer_gnutls_strerror(ret));

389

395

return -1;

390

396

}

391

397

392

if (debug){

398

if(debug){

393

399

/* "Use a log level over 10 to enable all debugging options."

394

400

* - GnuTLS manual

395

401

*/

399

405

400

406

/* OpenPGP credentials */

401

407

gnutls_certificate_allocate_credentials(&mc->cred);

402

if (ret != GNUTLS_E_SUCCESS){

403

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

404

warning */

405

safer_gnutls_strerror(ret));

406

gnutls_global_deinit ();

408

if(ret != GNUTLS_E_SUCCESS){

409

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

410

* from

411

* -Wunreachable-code

412

*/

413

safer_gnutls_strerror(ret));

414

gnutls_global_deinit();

407

415

return -1;

408

416

}

409

417

416

424

ret = gnutls_certificate_set_openpgp_key_file

417

425

(mc->cred, pubkeyfilename, seckeyfilename,

418

426

GNUTLS_OPENPGP_FMT_BASE64);

419

if (ret != GNUTLS_E_SUCCESS) {

427

if(ret != GNUTLS_E_SUCCESS) {

420

428

fprintf(stderr,

421

429

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

422

430

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

427

435

428

436

/* GnuTLS server initialization */

429

437

ret = gnutls_dh_params_init(&mc->dh_params);

430

if (ret != GNUTLS_E_SUCCESS) {

431

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

432

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

438

if(ret != GNUTLS_E_SUCCESS) {

439

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

440

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

433

441

goto globalfail;

434

442

}

435

443

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

436

if (ret != GNUTLS_E_SUCCESS) {

437

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

438

safer_gnutls_strerror(ret));

444

if(ret != GNUTLS_E_SUCCESS) {

445

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

446

safer_gnutls_strerror(ret));

439

447

goto globalfail;

440

448

}

441

449

456

464

int ret;

457

465

/* GnuTLS session creation */

458

466

ret = gnutls_init(session, GNUTLS_SERVER);

459

if (ret != GNUTLS_E_SUCCESS){

467

if(ret != GNUTLS_E_SUCCESS){

460

468

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

461

469

safer_gnutls_strerror(ret));

462

470

}

464

472

{

465

473

const char *err;

466

474

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

467

if (ret != GNUTLS_E_SUCCESS) {

475

if(ret != GNUTLS_E_SUCCESS) {

468

476

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

469

477

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

470

478

safer_gnutls_strerror(ret));

471

gnutls_deinit (*session);

479

gnutls_deinit(*session);

472

480

return -1;

473

481

}

474

482

}

475

483

476

484

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

477

485

mc->cred);

478

if (ret != GNUTLS_E_SUCCESS) {

486

if(ret != GNUTLS_E_SUCCESS) {

479

487

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

480

488

safer_gnutls_strerror(ret));

481

gnutls_deinit (*session);

489

gnutls_deinit(*session);

482

490

return -1;

483

491

}

484

492

485

493

/* ignore client certificate if any. */

486

gnutls_certificate_server_set_request (*session,

487

GNUTLS_CERT_IGNORE);

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

488

496

489

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

490

498

491

499

return 0;

492

500

}

500

508

AvahiIfIndex if_index,

501

509

mandos_context *mc){

502

510

int ret, tcp_sd;

511

ssize_t sret;

503

512

union { struct sockaddr in; struct sockaddr_in6 in6; } to;

504

513

char *buffer = NULL;

505

514

char *decrypted_buffer;

511

520

char interface[IF_NAMESIZE];

512

521

gnutls_session_t session;

513

522

514

ret = init_gnutls_session (mc, &session);

515

if (ret != 0){

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

516

525

return -1;

517

526

}

518

527

540

549

/* It would be nice to have a way to detect if we were passed an

541

550

IPv4 address here. Now we assume an IPv6 address. */

542

551

ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);

543

if (ret < 0 ){

552

if(ret < 0 ){

544

553

perror("inet_pton");

545

554

return -1;

546

555

}

548

557

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

549

558

return -1;

550

559

}

551

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

560

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

561

-Wconversion and

562

-Wunreachable-code */

552

563

553

564

to.in6.sin6_scope_id = (uint32_t)if_index;

554

565

567

578

}

568

579

569

580

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

570

if (ret < 0){

581

if(ret < 0){

571

582

perror("connect");

572

583

return -1;

573

584

}

574

585

575

586

const char *out = mandos_protocol_version;

576

587

written = 0;

577

while (true){

588

while(true){

578

589

size_t out_size = strlen(out);

579

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

590

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

580

591

out_size - written));

581

if (ret == -1){

592

if(ret == -1){

582

593

perror("write");

583

594

retval = -1;

584

595

goto mandos_end;

587

598

if(written < out_size){

588

599

continue;

589

600

} else {

590

if (out == mandos_protocol_version){

601

if(out == mandos_protocol_version){

591

602

written = 0;

592

603

out = "\r\n";

593

604

} else {

600

611

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

601

612

}

602

613

603

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

604

615

605

616

do{

606

ret = gnutls_handshake (session);

617

ret = gnutls_handshake(session);

607

618

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

608

619

609

if (ret != GNUTLS_E_SUCCESS){

620

if(ret != GNUTLS_E_SUCCESS){

610

621

if(debug){

611

622

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

612

gnutls_perror (ret);

623

gnutls_perror(ret);

613

624

}

614

625

retval = -1;

615

626

goto mandos_end;

625

636

while(true){

626

637

buffer_capacity = adjustbuffer(&buffer, buffer_length,

627

638

buffer_capacity);

628

if (buffer_capacity == 0){

639

if(buffer_capacity == 0){

629

640

perror("adjustbuffer");

630

641

retval = -1;

631

642

goto mandos_end;

632

643

}

633

644

634

ret = gnutls_record_recv(session, buffer+buffer_length,

635

BUFFER_SIZE);

636

if (ret == 0){

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

637

648

break;

638

649

}

639

if (ret < 0){

640

switch(ret){

650

if(sret < 0){

651

switch(sret){

641

652

case GNUTLS_E_INTERRUPTED:

642

653

case GNUTLS_E_AGAIN:

643

654

break;

644

655

case GNUTLS_E_REHANDSHAKE:

645

656

do{

646

ret = gnutls_handshake (session);

657

ret = gnutls_handshake(session);

647

658

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

648

if (ret < 0){

659

if(ret < 0){

649

660

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

650

gnutls_perror (ret);

661

gnutls_perror(ret);

651

662

retval = -1;

652

663

goto mandos_end;

653

664

}

656

667

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

657

668

" encrypted session with Mandos server\n");

658

669

retval = -1;

659

gnutls_bye (session, GNUTLS_SHUT_RDWR);

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

660

671

goto mandos_end;

661

672

}

662

673

} else {

663

buffer_length += (size_t) ret;

674

buffer_length += (size_t) sret;

664

675

}

665

676

}

666

677

668

679

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

669

680

}

670

681

671

gnutls_bye (session, GNUTLS_SHUT_RDWR);

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

672

683

673

if (buffer_length > 0){

684

if(buffer_length > 0){

674

685

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

675

686

buffer_length,

676

687

&decrypted_buffer);

677

if (decrypted_buffer_size >= 0){

688

if(decrypted_buffer_size >= 0){

678

689

written = 0;

679

690

while(written < (size_t) decrypted_buffer_size){

680

ret = (int)fwrite (decrypted_buffer + written, 1,

681

(size_t)decrypted_buffer_size - written,

682

stdout);

691

ret = (int)fwrite(decrypted_buffer + written, 1,

692

(size_t)decrypted_buffer_size - written,

693

stdout);

683

694

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

684

695

if(debug){

685

696

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

702

713

703

714

mandos_end:

704

715

free(buffer);

705

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

716

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

706

717

if(ret == -1){

707

718

perror("close");

708

719

}

709

gnutls_deinit (session);

720

gnutls_deinit(session);

710

721

return retval;

711

722

}

712

723

730

741

/* Called whenever a service has been resolved successfully or

731

742

timed out */

732

743

733

switch (event) {

744

switch(event) {

734

745

default:

735

746

case AVAHI_RESOLVER_FAILURE:

736

747

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

744

755

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

745

756

if(debug){

746

757

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

747

PRIu16 ") on port %d\n", name, host_name, ip,

748

interface, port);

758

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

759

ip, (intmax_t)interface, port);

749

760

}

750

761

int ret = start_mandos_communication(ip, port, interface, mc);

751

if (ret == 0){

762

if(ret == 0){

752

763

avahi_simple_poll_quit(mc->simple_poll);

753

764

}

754

765

}

772

783

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

773

784

is removed from the LAN */

774

785

775

switch (event) {

786

switch(event) {

776

787

default:

777

788

case AVAHI_BROWSER_FAILURE:

778

789

787

798

the callback function is called the Avahi server will free the

788

799

resolver for us. */

789

800

790

if (!(avahi_s_service_resolver_new(mc->server, interface,

801

if(!(avahi_s_service_resolver_new(mc->server, interface,

791

802

protocol, name, type, domain,

792

803

AVAHI_PROTO_INET6, 0,

793

804

resolve_callback, mc)))

811

822

AvahiSServiceBrowser *sb = NULL;

812

823

int error;

813

824

int ret;

825

intmax_t tmpmax;

826

int numchars;

814

827

int exitcode = EXIT_SUCCESS;

815

828

const char *interface = "eth0";

816

829

struct ifreq network;

828

841

":!CTYPE-X.509:+CTYPE-OPENPGP" };

829

842

bool gnutls_initalized = false;

830

843

bool gpgme_initalized = false;

844

double delay = 2.5;

831

845

832

846

{

833

847

struct argp_option options[] = {

859

873

.arg = "STRING",

860

874

.doc = "GnuTLS priority string for the TLS handshake",

861

875

.group = 1 },

876

{ .name = "delay", .key = 131,

877

.arg = "SECONDS",

878

.doc = "Maximum delay to wait for interface startup",

879

.group = 2 },

862

880

{ .name = NULL }

863

881

};

864

882

865

error_t parse_opt (int key, char *arg,

866

struct argp_state *state) {

867

/* Get the INPUT argument from `argp_parse', which we know is

868

a pointer to our plugin list pointer. */

869

switch (key) {

883

error_t parse_opt(int key, char *arg,

884

struct argp_state *state) {

885

switch(key) {

870

886

case 128: /* --debug */

871

887

debug = true;

872

888

break;

883

899

pubkey = arg;

884

900

break;

885

901

case 129: /* --dh-bits */

886

errno = 0;

887

mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);

888

if (errno){

889

perror("strtol");

902

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

903

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

904

or arg[numchars] != '\0'){

905

fprintf(stderr, "Bad number of DH bits\n");

890

906

exit(EXIT_FAILURE);

891

907

}

908

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

892

909

break;

893

910

case 130: /* --priority */

894

911

mc.priority = arg;

895

912

break;

913

case 131: /* --delay */

914

ret = sscanf(arg, "%lf%n", &delay, &numchars);

915

if(ret < 1 or arg[numchars] != '\0'){

916

fprintf(stderr, "Bad delay\n");

917

exit(EXIT_FAILURE);

918

}

919

break;

896

920

case ARGP_KEY_ARG:

897

argp_usage (state);

921

argp_usage(state);

898

922

case ARGP_KEY_END:

899

923

break;

900

924

default:

907

931

.args_doc = "",

908

932

.doc = "Mandos client -- Get and decrypt"

909

933

" passwords from a Mandos server" };

910

ret = argp_parse (&argp, argc, argv, 0, 0, NULL);

911

if (ret == ARGP_ERR_UNKNOWN){

934

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

935

if(ret == ARGP_ERR_UNKNOWN){

912

936

fprintf(stderr, "Unknown error while parsing arguments\n");

913

937

exitcode = EXIT_FAILURE;

914

938

goto end;

917

941

918

942

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

919

943

{

944

// Lower kernel loglevel to KERN_NOTICE to avoid

945

// KERN_INFO messages to mess up the prompt

946

ret = klogctl(8, NULL, 5);

947

if(ret == -1){

948

perror("klogctl");

949

}

950

920

951

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

921

952

if(sd < 0) {

922

953

perror("socket");

923

954

exitcode = EXIT_FAILURE;

955

ret = klogctl(7, NULL, 0);

956

if(ret == -1){

957

perror("klogctl");

958

}

924

959

goto end;

925

960

}

926

961

strcpy(network.ifr_name, interface);

927

962

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

928

963

if(ret == -1){

929

964

perror("ioctl SIOCGIFFLAGS");

965

ret = klogctl(7, NULL, 0);

966

if(ret == -1){

967

perror("klogctl");

968

}

930

969

exitcode = EXIT_FAILURE;

931

970

goto end;

932

971

}

936

975

if(ret == -1){

937

976

perror("ioctl SIOCSIFFLAGS");

938

977

exitcode = EXIT_FAILURE;

978

ret = klogctl(7, NULL, 0);

979

if(ret == -1){

980

perror("klogctl");

981

}

939

982

goto end;

940

983

}

941

984

}

942

ret = TEMP_FAILURE_RETRY(close(sd));

985

// sleep checking until interface is running

986

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

987

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

988

if(ret == -1){

989

perror("ioctl SIOCGIFFLAGS");

990

} else if(network.ifr_flags & IFF_RUNNING){

991

break;

992

}

993

struct timespec sleeptime = { .tv_nsec = 250000000 };

994

nanosleep(&sleeptime, NULL);

995

}

996

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

943

997

if(ret == -1){

944

998

perror("close");

945

999

}

1000

// Restores kernel loglevel to default

1001

ret = klogctl(7, NULL, 0);

1002

if(ret == -1){

1003

perror("klogctl");

1004

}

946

1005

}

947

1006

948

1007

uid = getuid();

949

1008

gid = getgid();

950

1009

951

1010

ret = setuid(uid);

952

if (ret == -1){

1011

if(ret == -1){

953

1012

perror("setuid");

954

1013

}

955

1014

956

1015

setgid(gid);

957

if (ret == -1){

1016

if(ret == -1){

958

1017

perror("setgid");

959

1018

}

960

1019

961

1020

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

962

if (ret == -1){

1021

if(ret == -1){

963

1022

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

964

1023

exitcode = EXIT_FAILURE;

965

1024

goto end;

996

1055

exitcode = EXIT_FAILURE;

997

1056

goto end;

998

1057

}

999

errno = 0;

1000

uint16_t port = (uint16_t) strtol(address+1, NULL, 10);

1001

if(errno){

1002

perror("Bad port number");

1058

uint16_t port;

1059

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1060

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1061

or address[numchars+1] != '\0'){

1062

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

1003

1063

exitcode = EXIT_FAILURE;

1004

1064

goto end;

1005

1065

}

1066

port = (uint16_t)tmpmax;

1006

1067

*address = '\0';

1007

1068

address = connect_to;

1008

1069

ret = start_mandos_communication(address, port, if_index, &mc);

1014

1075

goto end;

1015

1076

}

1016

1077

1017

if (not debug){

1078

if(not debug){

1018

1079

avahi_set_log_function(empty_log);

1019

1080

}

1020

1081

1023

1084

1024

1085

/* Allocate main Avahi loop object */

1025

1086

mc.simple_poll = avahi_simple_poll_new();

1026

if (mc.simple_poll == NULL) {

1087

if(mc.simple_poll == NULL) {

1027

1088

fprintf(stderr, "Avahi: Failed to create simple poll"

1028

1089

" object.\n");

1029

1090

exitcode = EXIT_FAILURE;

1049

1110

}

1050

1111

1051

1112

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

1052

if (mc.server == NULL) {

1113

if(mc.server == NULL) {

1053

1114

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

1054

1115

avahi_strerror(error));

1055

1116

exitcode = EXIT_FAILURE;

1061

1122

AVAHI_PROTO_INET6,

1062

1123

"_mandos._tcp", NULL, 0,

1063

1124

browse_callback, &mc);

1064

if (sb == NULL) {

1125

if(sb == NULL) {

1065

1126

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

1066

1127

avahi_strerror(avahi_server_errno(mc.server)));

1067

1128

exitcode = EXIT_FAILURE;

1070

1131

1071

1132

/* Run the main loop */

1072

1133

1073

if (debug){

1134

if(debug){

1074

1135

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

1075

1136

}

1076

1137

1077

1138

avahi_simple_poll_loop(mc.simple_poll);

1078

1139

1079

1140

end:

1080

1141

1081

if (debug){

1142

if(debug){

1082

1143

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

1083

1144

}

1084

1145

1085

1146

/* Cleanup things */

1086

if (sb != NULL)

1147

if(sb != NULL)

1087

1148

avahi_s_service_browser_free(sb);

1088

1149

1089

if (mc.server != NULL)

1150

if(mc.server != NULL)

1090

1151

avahi_server_free(mc.server);

1091

1152

1092

if (mc.simple_poll != NULL)

1153

if(mc.simple_poll != NULL)

1093

1154

avahi_simple_poll_free(mc.simple_poll);

1094

1155

1095

if (gnutls_initalized){

1156

if(gnutls_initalized){

1096

1157

gnutls_certificate_free_credentials(mc.cred);

1097

gnutls_global_deinit ();

1158

gnutls_global_deinit();

1098

1159

gnutls_dh_params_deinit(mc.dh_params);

1099

1160

}

1100

1161

1108

1169

struct dirent *direntry;

1109

1170

d = opendir(tempdir);

1110

1171

if(d == NULL){

1111

perror("opendir");

1172

if(errno != ENOENT){

1173

perror("opendir");

1174

}

1112

1175

} else {

1113

1176

while(true){

1114

1177

direntry = readdir(d);

1115

1178

if(direntry == NULL){

1116

1179

break;

1117

1180

}

1118

if (direntry->d_type == DT_REG){

1181

if(direntry->d_type == DT_REG){

1119

1182

char *fullname = NULL;

1120

1183

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

1121

1184

direntry->d_name);

1134

1197

closedir(d);

1135

1198

}

1136

1199

ret = rmdir(tempdir);

1137

if(ret == -1){

1200

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

1138

1201

perror("rmdir");

1139

1202

}

1140

1203

}