/mandos/release : revision 165

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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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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(), nanosleep() */

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

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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, 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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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>

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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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#define PUBKEY "pupkey.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 = "password-request 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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int ret;

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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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){

197

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);

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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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fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

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return false;

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}

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/* Create new GPGME "context" */

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

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if(rc != GPG_ERR_NO_ERROR){

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if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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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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254

}

256

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257

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

258

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

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0);

260

if(rc != GPG_ERR_NO_ERROR){

259

if (rc != GPG_ERR_NO_ERROR){

261

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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;

265

264

266

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

267

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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 */

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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;

282

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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317

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

318

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

319

perror("gpgme_data_seek");

317

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

318

perror("pgpme_data_seek");

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plaintext_length = -1;

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goto decrypt_end;

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}

326

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plaintext_capacity = adjustbuffer(plaintext,

327

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(size_t)plaintext_length,

328

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plaintext_capacity);

329

if(plaintext_capacity == 0){

328

if (plaintext_capacity == 0){

330

329

perror("adjustbuffer");

331

330

plaintext_length = -1;

332

331

goto decrypt_end;

335

334

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

336

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BUFFER_SIZE);

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336

/* Print the data, if any */

338

if(ret == 0){

337

if (ret == 0){

339

338

/* EOF */

340

339

break;

341

340

}

365

364

return plaintext_length;

366

365

}

367

366

368

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

371

return ret;

374

372

}

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

455

451

456

452

gnutls_certificate_free_credentials(mc->cred);

457

453

gnutls_global_deinit();

458

gnutls_dh_params_deinit(mc->dh_params);

459

454

return -1;

460

455

}

461

456

464

459

int ret;

465

460

/* GnuTLS session creation */

466

461

ret = gnutls_init(session, GNUTLS_SERVER);

467

if(ret != GNUTLS_E_SUCCESS){

462

if (ret != GNUTLS_E_SUCCESS){

468

463

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

469

464

safer_gnutls_strerror(ret));

470

465

}

472

467

{

473

468

const char *err;

474

469

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

475

if(ret != GNUTLS_E_SUCCESS) {

470

if (ret != GNUTLS_E_SUCCESS) {

476

471

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

477

472

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

478

473

safer_gnutls_strerror(ret));

479

gnutls_deinit(*session);

474

gnutls_deinit (*session);

480

475

return -1;

481

476

}

482

477

}

483

478

484

479

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

485

480

mc->cred);

486

if(ret != GNUTLS_E_SUCCESS) {

481

if (ret != GNUTLS_E_SUCCESS) {

487

482

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

488

483

safer_gnutls_strerror(ret));

489

gnutls_deinit(*session);

484

gnutls_deinit (*session);

490

485

return -1;

491

486

}

492

487

493

488

/* ignore client certificate if any. */

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

489

gnutls_certificate_server_set_request (*session,

490

GNUTLS_CERT_IGNORE);

496

491

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

492

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

498

493

499

494

return 0;

500

495

}

508

503

AvahiIfIndex if_index,

509

504

mandos_context *mc){

510

505

int ret, tcp_sd;

511

ssize_t sret;

512

506

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

513

507

char *buffer = NULL;

514

508

char *decrypted_buffer;

520

514

char interface[IF_NAMESIZE];

521

515

gnutls_session_t session;

522

516

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

517

ret = init_gnutls_session (mc, &session);

518

if (ret != 0){

525

519

return -1;

526

520

}

527

521

549

543

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

550

544

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

551

545

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

552

if(ret < 0 ){

546

if (ret < 0 ){

553

547

perror("inet_pton");

554

548

return -1;

555

549

}

557

551

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

558

552

return -1;

559

553

}

560

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

561

-Wconversion and

562

-Wunreachable-code */

554

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

563

555

564

556

to.in6.sin6_scope_id = (uint32_t)if_index;

565

557

578

570

}

579

571

580

572

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

581

if(ret < 0){

573

if (ret < 0){

582

574

perror("connect");

583

575

return -1;

584

576

}

585

577

586

578

const char *out = mandos_protocol_version;

587

579

written = 0;

588

while(true){

580

while (true){

589

581

size_t out_size = strlen(out);

590

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

582

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

591

583

out_size - written));

592

if(ret == -1){

584

if (ret == -1){

593

585

perror("write");

594

586

retval = -1;

595

587

goto mandos_end;

598

590

if(written < out_size){

599

591

continue;

600

592

} else {

601

if(out == mandos_protocol_version){

593

if (out == mandos_protocol_version){

602

594

written = 0;

603

595

out = "\r\n";

604

596

} else {

611

603

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

612

604

}

613

605

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

606

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

615

607

616

608

do{

617

ret = gnutls_handshake(session);

609

ret = gnutls_handshake (session);

618

610

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

619

611

620

if(ret != GNUTLS_E_SUCCESS){

612

if (ret != GNUTLS_E_SUCCESS){

621

613

if(debug){

622

614

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

623

gnutls_perror(ret);

615

gnutls_perror (ret);

624

616

}

625

617

retval = -1;

626

618

goto mandos_end;

636

628

while(true){

637

629

buffer_capacity = adjustbuffer(&buffer, buffer_length,

638

630

buffer_capacity);

639

if(buffer_capacity == 0){

631

if (buffer_capacity == 0){

640

632

perror("adjustbuffer");

641

633

retval = -1;

642

634

goto mandos_end;

643

635

}

644

636

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

637

ret = gnutls_record_recv(session, buffer+buffer_length,

638

BUFFER_SIZE);

639

if (ret == 0){

648

640

break;

649

641

}

650

if(sret < 0){

651

switch(sret){

642

if (ret < 0){

643

switch(ret){

652

644

case GNUTLS_E_INTERRUPTED:

653

645

case GNUTLS_E_AGAIN:

654

646

break;

655

647

case GNUTLS_E_REHANDSHAKE:

656

648

do{

657

ret = gnutls_handshake(session);

649

ret = gnutls_handshake (session);

658

650

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

659

if(ret < 0){

651

if (ret < 0){

660

652

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

661

gnutls_perror(ret);

653

gnutls_perror (ret);

662

654

retval = -1;

663

655

goto mandos_end;

664

656

}

667

659

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

668

660

" encrypted session with Mandos server\n");

669

661

retval = -1;

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

662

gnutls_bye (session, GNUTLS_SHUT_RDWR);

671

663

goto mandos_end;

672

664

}

673

665

} else {

674

buffer_length += (size_t) sret;

666

buffer_length += (size_t) ret;

675

667

}

676

668

}

677

669

679

671

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

680

672

}

681

673

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

674

gnutls_bye (session, GNUTLS_SHUT_RDWR);

683

675

684

if(buffer_length > 0){

676

if (buffer_length > 0){

685

677

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

686

678

buffer_length,

687

679

&decrypted_buffer);

688

if(decrypted_buffer_size >= 0){

680

if (decrypted_buffer_size >= 0){

689

681

written = 0;

690

682

while(written < (size_t) decrypted_buffer_size){

691

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

692

(size_t)decrypted_buffer_size - written,

693

stdout);

683

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

684

(size_t)decrypted_buffer_size - written,

685

stdout);

694

686

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

695

687

if(debug){

696

688

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

713

705

714

706

mandos_end:

715

707

free(buffer);

716

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

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

717

709

if(ret == -1){

718

710

perror("close");

719

711

}

720

gnutls_deinit(session);

712

gnutls_deinit (session);

721

713

return retval;

722

714

}

723

715

741

733

/* Called whenever a service has been resolved successfully or

742

734

timed out */

743

735

744

switch(event) {

736

switch (event) {

745

737

default:

746

738

case AVAHI_RESOLVER_FAILURE:

747

739

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

755

747

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

756

748

if(debug){

757

749

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

758

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

759

ip, (intmax_t)interface, port);

750

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

751

interface, port);

760

752

}

761

753

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

762

if(ret == 0){

754

if (ret == 0){

763

755

avahi_simple_poll_quit(mc->simple_poll);

764

756

}

765

757

}

783

775

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

784

776

is removed from the LAN */

785

777

786

switch(event) {

778

switch (event) {

787

779

default:

788

780

case AVAHI_BROWSER_FAILURE:

789

781

798

790

the callback function is called the Avahi server will free the

799

791

resolver for us. */

800

792

801

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

793

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

802

794

protocol, name, type, domain,

803

795

AVAHI_PROTO_INET6, 0,

804

796

resolve_callback, mc)))

822

814

AvahiSServiceBrowser *sb = NULL;

823

815

int error;

824

816

int ret;

825

intmax_t tmpmax;

826

int numchars;

827

817

int exitcode = EXIT_SUCCESS;

828

818

const char *interface = "eth0";

829

819

struct ifreq network;

840

830

.dh_bits = 1024, .priority = "SECURE256"

841

831

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

842

832

bool gnutls_initalized = false;

843

bool gpgme_initalized = false;

844

double delay = 2.5;

833

bool pgpme_initalized = false;

845

834

846

835

{

847

836

struct argp_option options[] = {

873

862

.arg = "STRING",

874

863

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

875

864

.group = 1 },

876

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

877

.arg = "SECONDS",

878

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

879

.group = 2 },

880

865

{ .name = NULL }

881

866

};

882

867

883

error_t parse_opt(int key, char *arg,

884

struct argp_state *state) {

885

switch(key) {

868

error_t parse_opt (int key, char *arg,

869

struct argp_state *state) {

870

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

871

a pointer to our plugin list pointer. */

872

switch (key) {

886

873

case 128: /* --debug */

887

874

debug = true;

888

875

break;

899

886

pubkey = arg;

900

887

break;

901

888

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

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");

889

errno = 0;

890

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

891

if (errno){

892

perror("strtol");

906

893

exit(EXIT_FAILURE);

907

894

}

908

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

909

895

break;

910

896

case 130: /* --priority */

911

897

mc.priority = arg;

912

898

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;

920

899

case ARGP_KEY_ARG:

921

argp_usage(state);

900

argp_usage (state);

922

901

case ARGP_KEY_END:

923

902

break;

924

903

default:

931

910

.args_doc = "",

932

911

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

933

912

" passwords from a Mandos server" };

934

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

935

if(ret == ARGP_ERR_UNKNOWN){

913

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

914

if (ret == ARGP_ERR_UNKNOWN){

936

915

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

937

916

exitcode = EXIT_FAILURE;

938

917

goto end;

939

918

}

940

919

}

941

920

921

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

922

if (ret == -1){

923

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

924

exitcode = EXIT_FAILURE;

925

goto end;

926

} else {

927

gnutls_initalized = true;

928

}

929

930

if(mkdtemp(tempdir) == NULL){

931

perror("mkdtemp");

932

tempdir[0] = '\0';

933

goto end;

934

}

935

936

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

937

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

938

exitcode = EXIT_FAILURE;

939

goto end;

940

} else {

941

pgpme_initalized = true;

942

}

943

942

944

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

943

945

{

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

951

946

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

952

947

if(sd < 0) {

953

948

perror("socket");

954

949

exitcode = EXIT_FAILURE;

955

ret = klogctl(7, NULL, 0);

956

if(ret == -1){

957

perror("klogctl");

958

}

959

950

goto end;

960

951

}

961

952

strcpy(network.ifr_name, interface);

962

953

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

963

954

if(ret == -1){

964

955

perror("ioctl SIOCGIFFLAGS");

965

ret = klogctl(7, NULL, 0);

966

if(ret == -1){

967

perror("klogctl");

968

}

969

956

exitcode = EXIT_FAILURE;

970

957

goto end;

971

958

}

975

962

if(ret == -1){

976

963

perror("ioctl SIOCSIFFLAGS");

977

964

exitcode = EXIT_FAILURE;

978

ret = klogctl(7, NULL, 0);

979

if(ret == -1){

980

perror("klogctl");

981

}

982

965

goto end;

983

966

}

984

967

}

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));

968

ret = TEMP_FAILURE_RETRY(close(sd));

997

969

if(ret == -1){

998

970

perror("close");

999

971

}

1000

// Restores kernel loglevel to default

1001

ret = klogctl(7, NULL, 0);

1002

if(ret == -1){

1003

perror("klogctl");

1004

}

1005

972

}

1006

973

1007

974

uid = getuid();

1008

975

gid = getgid();

1009

976

1010

977

ret = setuid(uid);

1011

if(ret == -1){

978

if (ret == -1){

1012

979

perror("setuid");

1013

980

}

1014

981

1015

982

setgid(gid);

1016

if(ret == -1){

983

if (ret == -1){

1017

984

perror("setgid");

1018

985

}

1019

986

1020

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

1021

if(ret == -1){

1022

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

1023

exitcode = EXIT_FAILURE;

1024

goto end;

1025

} else {

1026

gnutls_initalized = true;

1027

}

1028

1029

if(mkdtemp(tempdir) == NULL){

1030

perror("mkdtemp");

1031

tempdir[0] = '\0';

1032

goto end;

1033

}

1034

1035

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

1036

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

1037

exitcode = EXIT_FAILURE;

1038

goto end;

1039

} else {

1040

gpgme_initalized = true;

1041

}

1042

1043

987

if_index = (AvahiIfIndex) if_nametoindex(interface);

1044

988

if(if_index == 0){

1045

989

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

1055

999

exitcode = EXIT_FAILURE;

1056

1000

goto end;

1057

1001

}

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");

1002

errno = 0;

1003

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

1004

if(errno){

1005

perror("Bad port number");

1063

1006

exitcode = EXIT_FAILURE;

1064

1007

goto end;

1065

1008

}

1066

port = (uint16_t)tmpmax;

1067

1009

*address = '\0';

1068

1010

address = connect_to;

1069

1011

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

1075

1017

goto end;

1076

1018

}

1077

1019

1078

if(not debug){

1020

if (not debug){

1079

1021

avahi_set_log_function(empty_log);

1080

1022

}

1081

1023

1084

1026

1085

1027

/* Allocate main Avahi loop object */

1086

1028

mc.simple_poll = avahi_simple_poll_new();

1087

if(mc.simple_poll == NULL) {

1029

if (mc.simple_poll == NULL) {

1088

1030

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

1089

1031

" object.\n");

1090

1032

exitcode = EXIT_FAILURE;

1110

1052

}

1111

1053

1112

1054

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

1113

if(mc.server == NULL) {

1055

if (mc.server == NULL) {

1114

1056

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

1115

1057

avahi_strerror(error));

1116

1058

exitcode = EXIT_FAILURE;

1122

1064

AVAHI_PROTO_INET6,

1123

1065

"_mandos._tcp", NULL, 0,

1124

1066

browse_callback, &mc);

1125

if(sb == NULL) {

1067

if (sb == NULL) {

1126

1068

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

1127

1069

avahi_strerror(avahi_server_errno(mc.server)));

1128

1070

exitcode = EXIT_FAILURE;

1131

1073

1132

1074

/* Run the main loop */

1133

1075

1134

if(debug){

1076

if (debug){

1135

1077

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

1136

1078

}

1137

1079

1138

1080

avahi_simple_poll_loop(mc.simple_poll);

1139

1081

1140

1082

end:

1141

1083

1142

if(debug){

1084

if (debug){

1143

1085

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

1144

1086

}

1145

1087

1146

1088

/* Cleanup things */

1147

if(sb != NULL)

1089

if (sb != NULL)

1148

1090

avahi_s_service_browser_free(sb);

1149

1091

1150

if(mc.server != NULL)

1092

if (mc.server != NULL)

1151

1093

avahi_server_free(mc.server);

1152

1094

1153

if(mc.simple_poll != NULL)

1095

if (mc.simple_poll != NULL)

1154

1096

avahi_simple_poll_free(mc.simple_poll);

1155

1097

1156

if(gnutls_initalized){

1098

if (gnutls_initalized){

1157

1099

gnutls_certificate_free_credentials(mc.cred);

1158

gnutls_global_deinit();

1159

gnutls_dh_params_deinit(mc.dh_params);

1100

gnutls_global_deinit ();

1160

1101

}

1161

1162

if(gpgme_initalized){

1102

1103

if(pgpme_initalized){

1163

1104

gpgme_release(mc.ctx);

1164

1105

}

1165

1106

1166

1107

/* Removes the temp directory used by GPGME */

1167

1108

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

1168

1109

DIR *d;

1169

1110

struct dirent *direntry;

1170

1111

d = opendir(tempdir);

1171

1112

if(d == NULL){

1172

if(errno != ENOENT){

1173

perror("opendir");

1174

}

1113

perror("opendir");

1175

1114

} else {

1176

1115

while(true){

1177

1116

direntry = readdir(d);

1178

1117

if(direntry == NULL){

1179

1118

break;

1180

1119

}

1181

if(direntry->d_type == DT_REG){

1120

if (direntry->d_type == DT_REG){

1182

1121

char *fullname = NULL;

1183

1122

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

1184

1123

direntry->d_name);

1194

1133

free(fullname);

1195

1134

}

1196

1135

}

1197

closedir(d);

1198

1136

}

1199

1137

ret = rmdir(tempdir);

1200

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

1138

if(ret == -1){

1201

1139

perror("rmdir");

1202

1140

}

1203

1141

}