/mandos/trunk : revision 203

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

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/*

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

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

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*

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

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* service browser, downloaded from

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

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

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stdout, ferror(), sscanf(),

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remove() */

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stdout, ferror() */

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

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

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

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DIR */

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

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

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

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

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

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

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

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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, or */

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

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

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argp_state, struct argp,

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argp_parse(), ARGP_KEY_ARG,

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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>

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/* gnutls_certificate_set_openpgp_key_file(),

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

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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#define BUFFER_SIZE 256

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/*

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#define PATHDIR "/conf/conf.d/mandos"

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*/

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#define PATHDIR "/conf/conf.d/mandos"

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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const char *argp_program_version = "mandos-client 1.0";

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

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/* Used for passing in values through the Avahi callback functions */

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*/

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size_t adjustbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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if (buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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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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/*

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

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

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*/

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bool import_key(const char *filename){

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int fd;

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gpgme_data_t pgp_data;

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

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

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ret = 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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}

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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);

198

if(rc != GPG_ERR_NO_ERROR){

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if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

205

rc = gpgme_get_engine_info(&engine_info);

206

if(rc != GPG_ERR_NO_ERROR){

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rc = gpgme_get_engine_info (&engine_info);

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if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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){

225

if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

231

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

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return false;

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}

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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,

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size_t crypto_size,

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char **plaintext){

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static ssize_t pgp_packet_decrypt (const mandos_context *mc,

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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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if(debug){

252

if (debug){

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

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}

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257

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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,

259

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0);

260

if(rc != GPG_ERR_NO_ERROR){

259

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;

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

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rc = gpgme_data_new(&dh_plain);

268

if(rc != GPG_ERR_NO_ERROR){

267

if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_data_release(dh_crypto);

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

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data buffer */

277

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

278

if(rc != GPG_ERR_NO_ERROR){

277

if (rc != GPG_ERR_NO_ERROR){

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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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plaintext_length = -1;

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if(debug){

281

if (debug){

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gpgme_decrypt_result_t result;

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result = gpgme_op_decrypt_result(mc->ctx);

285

if(result == NULL){

284

if (result == NULL){

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

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} else {

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

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}

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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){

317

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);

329

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;

332

331

goto decrypt_end;

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ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

336

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BUFFER_SIZE);

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/* Print the data, if any */

338

if(ret == 0){

337

if (ret == 0){

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/* EOF */

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break;

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340

}

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return plaintext_length;

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}

367

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static const char * safer_gnutls_strerror(int value) {

369

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

370

-Wunreachable-code */

371

if(ret == NULL)

367

static const char * safer_gnutls_strerror (int value) {

368

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

369

if (ret == NULL)

372

370

ret = "(unknown)";

373

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return ret;

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}

389

387

}

390

388

391

389

ret = gnutls_global_init();

392

if(ret != GNUTLS_E_SUCCESS) {

393

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

394

safer_gnutls_strerror(ret));

390

if (ret != GNUTLS_E_SUCCESS) {

391

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

392

safer_gnutls_strerror(ret));

395

393

return -1;

396

394

}

397

395

398

if(debug){

396

if (debug){

399

397

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

400

398

* - GnuTLS manual

401

399

*/

405

403

406

404

/* OpenPGP credentials */

407

405

gnutls_certificate_allocate_credentials(&mc->cred);

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();

406

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

409

safer_gnutls_strerror(ret));

410

gnutls_global_deinit ();

415

411

return -1;

416

412

}

417

413

424

420

ret = gnutls_certificate_set_openpgp_key_file

425

421

(mc->cred, pubkeyfilename, seckeyfilename,

426

422

GNUTLS_OPENPGP_FMT_BASE64);

427

if(ret != GNUTLS_E_SUCCESS) {

423

if (ret != GNUTLS_E_SUCCESS) {

428

424

fprintf(stderr,

429

425

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

430

426

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

435

431

436

432

/* GnuTLS server initialization */

437

433

ret = gnutls_dh_params_init(&mc->dh_params);

438

if(ret != GNUTLS_E_SUCCESS) {

439

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

440

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

434

if (ret != GNUTLS_E_SUCCESS) {

435

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

436

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

441

437

goto globalfail;

442

438

}

443

439

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

444

if(ret != GNUTLS_E_SUCCESS) {

445

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

446

safer_gnutls_strerror(ret));

440

if (ret != GNUTLS_E_SUCCESS) {

441

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

442

safer_gnutls_strerror(ret));

447

443

goto globalfail;

448

444

}

449

445

464

460

int ret;

465

461

/* GnuTLS session creation */

466

462

ret = gnutls_init(session, GNUTLS_SERVER);

467

if(ret != GNUTLS_E_SUCCESS){

463

if (ret != GNUTLS_E_SUCCESS){

468

464

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

469

465

safer_gnutls_strerror(ret));

470

466

}

472

468

{

473

469

const char *err;

474

470

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

475

if(ret != GNUTLS_E_SUCCESS) {

471

if (ret != GNUTLS_E_SUCCESS) {

476

472

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

477

473

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

478

474

safer_gnutls_strerror(ret));

479

gnutls_deinit(*session);

475

gnutls_deinit (*session);

480

476

return -1;

481

477

}

482

478

}

483

479

484

480

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

485

481

mc->cred);

486

if(ret != GNUTLS_E_SUCCESS) {

482

if (ret != GNUTLS_E_SUCCESS) {

487

483

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

488

484

safer_gnutls_strerror(ret));

489

gnutls_deinit(*session);

485

gnutls_deinit (*session);

490

486

return -1;

491

487

}

492

488

493

489

/* ignore client certificate if any. */

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

490

gnutls_certificate_server_set_request (*session,

491

GNUTLS_CERT_IGNORE);

496

492

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

493

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

498

494

499

495

return 0;

500

496

}

508

504

AvahiIfIndex if_index,

509

505

mandos_context *mc){

510

506

int ret, tcp_sd;

511

ssize_t sret;

512

507

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

513

508

char *buffer = NULL;

514

509

char *decrypted_buffer;

520

515

char interface[IF_NAMESIZE];

521

516

gnutls_session_t session;

522

517

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

518

ret = init_gnutls_session (mc, &session);

519

if (ret != 0){

525

520

return -1;

526

521

}

527

522

549

544

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

550

545

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

551

546

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

552

if(ret < 0 ){

547

if (ret < 0 ){

553

548

perror("inet_pton");

554

549

return -1;

555

550

}

557

552

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

558

553

return -1;

559

554

}

560

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

561

-Wconversion and

562

-Wunreachable-code */

555

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

563

556

564

557

to.in6.sin6_scope_id = (uint32_t)if_index;

565

558

578

571

}

579

572

580

573

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

581

if(ret < 0){

574

if (ret < 0){

582

575

perror("connect");

583

576

return -1;

584

577

}

585

578

586

579

const char *out = mandos_protocol_version;

587

580

written = 0;

588

while(true){

581

while (true){

589

582

size_t out_size = strlen(out);

590

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

583

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

591

584

out_size - written));

592

if(ret == -1){

585

if (ret == -1){

593

586

perror("write");

594

587

retval = -1;

595

588

goto mandos_end;

598

591

if(written < out_size){

599

592

continue;

600

593

} else {

601

if(out == mandos_protocol_version){

594

if (out == mandos_protocol_version){

602

595

written = 0;

603

596

out = "\r\n";

604

597

} else {

611

604

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

612

605

}

613

606

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

607

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

615

608

616

609

do{

617

ret = gnutls_handshake(session);

610

ret = gnutls_handshake (session);

618

611

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

619

612

620

if(ret != GNUTLS_E_SUCCESS){

613

if (ret != GNUTLS_E_SUCCESS){

621

614

if(debug){

622

615

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

623

gnutls_perror(ret);

616

gnutls_perror (ret);

624

617

}

625

618

retval = -1;

626

619

goto mandos_end;

636

629

while(true){

637

630

buffer_capacity = adjustbuffer(&buffer, buffer_length,

638

631

buffer_capacity);

639

if(buffer_capacity == 0){

632

if (buffer_capacity == 0){

640

633

perror("adjustbuffer");

641

634

retval = -1;

642

635

goto mandos_end;

643

636

}

644

637

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

638

ret = gnutls_record_recv(session, buffer+buffer_length,

639

BUFFER_SIZE);

640

if (ret == 0){

648

641

break;

649

642

}

650

if(sret < 0){

651

switch(sret){

643

if (ret < 0){

644

switch(ret){

652

645

case GNUTLS_E_INTERRUPTED:

653

646

case GNUTLS_E_AGAIN:

654

647

break;

655

648

case GNUTLS_E_REHANDSHAKE:

656

649

do{

657

ret = gnutls_handshake(session);

650

ret = gnutls_handshake (session);

658

651

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

659

if(ret < 0){

652

if (ret < 0){

660

653

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

661

gnutls_perror(ret);

654

gnutls_perror (ret);

662

655

retval = -1;

663

656

goto mandos_end;

664

657

}

667

660

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

668

661

" encrypted session with Mandos server\n");

669

662

retval = -1;

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

663

gnutls_bye (session, GNUTLS_SHUT_RDWR);

671

664

goto mandos_end;

672

665

}

673

666

} else {

674

buffer_length += (size_t) sret;

667

buffer_length += (size_t) ret;

675

668

}

676

669

}

677

670

679

672

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

680

673

}

681

674

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

675

gnutls_bye (session, GNUTLS_SHUT_RDWR);

683

676

684

if(buffer_length > 0){

677

if (buffer_length > 0){

685

678

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

686

679

buffer_length,

687

680

&decrypted_buffer);

688

if(decrypted_buffer_size >= 0){

681

if (decrypted_buffer_size >= 0){

689

682

written = 0;

690

683

while(written < (size_t) decrypted_buffer_size){

691

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

692

(size_t)decrypted_buffer_size - written,

693

stdout);

684

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

685

(size_t)decrypted_buffer_size - written,

686

stdout);

694

687

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

695

688

if(debug){

696

689

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

713

706

714

707

mandos_end:

715

708

free(buffer);

716

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

709

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

717

710

if(ret == -1){

718

711

perror("close");

719

712

}

720

gnutls_deinit(session);

713

gnutls_deinit (session);

721

714

return retval;

722

715

}

723

716

741

734

/* Called whenever a service has been resolved successfully or

742

735

timed out */

743

736

744

switch(event) {

737

switch (event) {

745

738

default:

746

739

case AVAHI_RESOLVER_FAILURE:

747

740

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

755

748

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

756

749

if(debug){

757

750

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

758

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

759

ip, (intmax_t)interface, port);

751

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

752

interface, port);

760

753

}

761

754

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

762

if(ret == 0){

755

if (ret == 0){

763

756

avahi_simple_poll_quit(mc->simple_poll);

764

757

}

765

758

}

783

776

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

784

777

is removed from the LAN */

785

778

786

switch(event) {

779

switch (event) {

787

780

default:

788

781

case AVAHI_BROWSER_FAILURE:

789

782

798

791

the callback function is called the Avahi server will free the

799

792

resolver for us. */

800

793

801

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

794

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

802

795

protocol, name, type, domain,

803

796

AVAHI_PROTO_INET6, 0,

804

797

resolve_callback, mc)))

822

815

AvahiSServiceBrowser *sb = NULL;

823

816

int error;

824

817

int ret;

825

intmax_t tmpmax;

826

int numchars;

827

818

int exitcode = EXIT_SUCCESS;

828

819

const char *interface = "eth0";

829

820

struct ifreq network;

832

823

gid_t gid;

833

824

char *connect_to = NULL;

834

825

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

835

bool tempdir_created = false;

836

826

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

837

827

const char *seckey = PATHDIR "/" SECKEY;

838

828

const char *pubkey = PATHDIR "/" PUBKEY;

840

830

mandos_context mc = { .simple_poll = NULL, .server = NULL,

841

831

.dh_bits = 1024, .priority = "SECURE256"

842

832

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

843

bool gnutls_initialized = false;

844

bool gpgme_initialized = false;

833

bool gnutls_initalized = false;

834

bool gpgme_initalized = false;

845

835

846

836

{

847

837

struct argp_option options[] = {

876

866

{ .name = NULL }

877

867

};

878

868

879

error_t parse_opt(int key, char *arg,

880

struct argp_state *state) {

881

switch(key) {

869

error_t parse_opt (int key, char *arg,

870

struct argp_state *state) {

871

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

872

a pointer to our plugin list pointer. */

873

switch (key) {

882

874

case 128: /* --debug */

883

875

debug = true;

884

876

break;

895

887

pubkey = arg;

896

888

break;

897

889

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

898

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

899

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

900

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

901

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

890

errno = 0;

891

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

892

if (errno){

893

perror("strtol");

902

894

exit(EXIT_FAILURE);

903

895

}

904

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

905

896

break;

906

897

case 130: /* --priority */

907

898

mc.priority = arg;

908

899

break;

909

900

case ARGP_KEY_ARG:

910

argp_usage(state);

901

argp_usage (state);

911

902

case ARGP_KEY_END:

912

903

break;

913

904

default:

920

911

.args_doc = "",

921

912

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

922

913

" passwords from a Mandos server" };

923

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

924

if(ret == ARGP_ERR_UNKNOWN){

914

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

915

if (ret == ARGP_ERR_UNKNOWN){

925

916

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

926

917

exitcode = EXIT_FAILURE;

927

918

goto end;

952

943

goto end;

953

944

}

954

945

}

955

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

946

ret = TEMP_FAILURE_RETRY(close(sd));

956

947

if(ret == -1){

957

948

perror("close");

958

949

}

962

953

gid = getgid();

963

954

964

955

ret = setuid(uid);

965

if(ret == -1){

956

if (ret == -1){

966

957

perror("setuid");

967

958

}

968

959

969

960

setgid(gid);

970

if(ret == -1){

961

if (ret == -1){

971

962

perror("setgid");

972

963

}

973

964

974

965

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

975

if(ret == -1){

966

if (ret == -1){

976

967

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

977

968

exitcode = EXIT_FAILURE;

978

969

goto end;

979

970

} else {

980

gnutls_initialized = true;

971

gnutls_initalized = true;

981

972

}

982

973

983

974

if(mkdtemp(tempdir) == NULL){

984

975

perror("mkdtemp");

976

tempdir[0] = '\0';

985

977

goto end;

986

978

}

987

tempdir_created = true;

988

979

989

980

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

990

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

981

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

991

982

exitcode = EXIT_FAILURE;

992

983

goto end;

993

984

} else {

994

gpgme_initialized = true;

985

gpgme_initalized = true;

995

986

}

996

987

997

988

if_index = (AvahiIfIndex) if_nametoindex(interface);

998

989

if(if_index == 0){

999

990

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

1000

exitcode = EXIT_FAILURE;

1001

goto end;

991

exit(EXIT_FAILURE);

1002

992

}

1003

993

1004

994

if(connect_to != NULL){

1010

1000

exitcode = EXIT_FAILURE;

1011

1001

goto end;

1012

1002

}

1013

uint16_t port;

1014

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

1015

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

1016

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

1017

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

1003

errno = 0;

1004

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

1005

if(errno){

1006

perror("Bad port number");

1018

1007

exitcode = EXIT_FAILURE;

1019

1008

goto end;

1020

1009

}

1021

port = (uint16_t)tmpmax;

1022

1010

*address = '\0';

1023

1011

address = connect_to;

1024

1012

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

1030

1018

goto end;

1031

1019

}

1032

1020

1033

if(not debug){

1021

if (not debug){

1034

1022

avahi_set_log_function(empty_log);

1035

1023

}

1036

1024

1039

1027

1040

1028

/* Allocate main Avahi loop object */

1041

1029

mc.simple_poll = avahi_simple_poll_new();

1042

if(mc.simple_poll == NULL) {

1030

if (mc.simple_poll == NULL) {

1043

1031

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

1044

1032

" object.\n");

1045

1033

exitcode = EXIT_FAILURE;

1065

1053

}

1066

1054

1067

1055

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

1068

if(mc.server == NULL) {

1056

if (mc.server == NULL) {

1069

1057

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

1070

1058

avahi_strerror(error));

1071

1059

exitcode = EXIT_FAILURE;

1077

1065

AVAHI_PROTO_INET6,

1078

1066

"_mandos._tcp", NULL, 0,

1079

1067

browse_callback, &mc);

1080

if(sb == NULL) {

1068

if (sb == NULL) {

1081

1069

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

1082

1070

avahi_strerror(avahi_server_errno(mc.server)));

1083

1071

exitcode = EXIT_FAILURE;

1086

1074

1087

1075

/* Run the main loop */

1088

1076

1089

if(debug){

1077

if (debug){

1090

1078

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

1091

1079

}

1092

1080

1094

1082

1095

1083

end:

1096

1084

1097

if(debug){

1085

if (debug){

1098

1086

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

1099

1087

}

1100

1088

1101

1089

/* Cleanup things */

1102

if(sb != NULL)

1090

if (sb != NULL)

1103

1091

avahi_s_service_browser_free(sb);

1104

1092

1105

if(mc.server != NULL)

1093

if (mc.server != NULL)

1106

1094

avahi_server_free(mc.server);

1107

1095

1108

if(mc.simple_poll != NULL)

1096

if (mc.simple_poll != NULL)

1109

1097

avahi_simple_poll_free(mc.simple_poll);

1110

1098

1111

if(gnutls_initialized){

1099

if (gnutls_initalized){

1112

1100

gnutls_certificate_free_credentials(mc.cred);

1113

gnutls_global_deinit();

1101

gnutls_global_deinit ();

1114

1102

gnutls_dh_params_deinit(mc.dh_params);

1115

1103

}

1116

1104

1117

if(gpgme_initialized){

1105

if(gpgme_initalized){

1118

1106

gpgme_release(mc.ctx);

1119

1107

}

1120

1108

1121

1109

/* Removes the temp directory used by GPGME */

1122

if(tempdir_created){

1110

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

1123

1111

DIR *d;

1124

1112

struct dirent *direntry;

1125

1113

d = opendir(tempdir);

1126

1114

if(d == NULL){

1127

if(errno != ENOENT){

1128

perror("opendir");

1129

}

1115

perror("opendir");

1130

1116

} else {

1131

1117

while(true){

1132

1118

direntry = readdir(d);

1133

1119

if(direntry == NULL){

1134

1120

break;

1135

1121

}

1136

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

1137

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

1138

and (direntry->d_name[1] == '\0'

1139

or (direntry->d_name[1] == '.'

1140

and direntry->d_name[2] == '\0'))){

1141

continue;

1142

}

1143

char *fullname = NULL;

1144

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

1145

direntry->d_name);

1146

if(ret < 0){

1147

perror("asprintf");

1148

continue;

1149

}

1150

ret = remove(fullname);

1151

if(ret == -1){

1152

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

1153

strerror(errno));

1154

}

1155

free(fullname);

1122

if (direntry->d_type == DT_REG){

1123

char *fullname = NULL;

1124

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

1125

direntry->d_name);

1126

if(ret < 0){

1127

perror("asprintf");

1128

continue;

1129

}

1130

ret = unlink(fullname);

1131

if(ret == -1){

1132

fprintf(stderr, "unlink(\"%s\"): %s",

1133

fullname, strerror(errno));

1134

}

1135

free(fullname);

1136

}

1156

1137

}

1157

1138

closedir(d);

1158

1139

}

1159

1140

ret = rmdir(tempdir);

1160

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

1141

if(ret == -1){

1161

1142

perror("rmdir");

1162

1143

}

1163

1144

}

1164

1145

1165

1146

return exitcode;

1166

1147

}