/mandos/release : revision 243

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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 _LARGEFILE_SOURCE

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#define _FILE_OFFSET_BITS 64

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

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

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#include <stdio.h>

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#include <assert.h>

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#include <stdlib.h>

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#include <time.h>

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#include <net/if.h> /* if_nametoindex */

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

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SIOCSIFFLAGS */

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

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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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srand() */

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#include <stdbool.h> /* bool, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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#include <sys/ioctl.h> /* ioctl */

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

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

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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 */

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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#include <netinet/in.h>

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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

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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 <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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/* Avahi */

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/* All Avahi types, constants and functions

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Avahi*, avahi_*,

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AVAHI_* */

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#include <avahi-core/core.h>

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#include <avahi-core/lookup.h>

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#include <avahi-core/log.h>

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84

#include <avahi-common/malloc.h>

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#include <avahi-common/error.h>

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86

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/* Mandos client part */

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

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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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#include <gnutls/gnutls.h> /* All GnuTLS stuff */

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#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */

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/* GnuTLS */

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#include <gnutls/gnutls.h> /* All GnuTLS types, constants and

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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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GNUTLS_OPENPGP_FMT_BASE64 */

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#include <unistd.h> /* close() */

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#include <netinet/in.h>

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#include <stdbool.h> /* true */

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#include <string.h> /* memset */

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

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

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#include <net/if.h> /* IF_NAMESIZE */

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

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struct argp_state, struct argp,

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argp_parse() */

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96

/* GPGME */

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

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#include <gpgme.h>

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#include <gpgme.h> /* All GPGME types, constants and

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functions:

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gpgme_*

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GPGME_PROTOCOL_OpenPGP,

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GPG_ERR_NO_* */

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#define BUFFER_SIZE 256

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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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const char *keydir = "/conf/conf.d/mandos";

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const char *argp_program_version = "mandosclient 0.9";

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static const char mandos_protocol_version[] = "1";

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

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

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const char mandos_protocol_version[] = "1";

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113

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

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

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typedef struct {

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116

AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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unsigned int dh_bits;

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gnutls_dh_params_t dh_params;

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const char *priority;

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gpgme_ctx_t ctx;

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} mandos_context;

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/*

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* Make room in "buffer" for at least BUFFER_SIZE additional bytes.

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* "buffer_capacity" is how much is currently allocated,

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* "buffer_length" is how much is already used.

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*/

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size_t adjustbuffer(char **buffer, size_t buffer_length,

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131

size_t buffer_capacity){

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132

if (buffer_length + BUFFER_SIZE > buffer_capacity){

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140

}

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141

105

142

/*

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* Decrypt OpenPGP data using keyrings in HOMEDIR.

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* Returns -1 on error

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* Initialize GPGME.

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144

*/

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static ssize_t pgp_packet_decrypt (const char *cryptotext,

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size_t crypto_size,

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char **plaintext,

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const char *homedir){

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gpgme_data_t dh_crypto, dh_plain;

114

gpgme_ctx_t ctx;

145

static bool init_gpgme(mandos_context *mc, const char *seckey,

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const char *pubkey, const char *tempdir){

147

int ret;

115

148

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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gpgme_engine_info_t engine_info;

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150

151

152

/*

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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 = 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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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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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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if(ret == -1){

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perror("close");

182

}

183

gpgme_data_release(pgp_data);

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return true;

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}

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if (debug){

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

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

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}

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190

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/* Init GPGME */

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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 -1;

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return false;

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198

}

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199

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

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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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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 -1;

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return false;

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}

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while(engine_info != NULL){

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if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

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gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

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engine_info->file_name, homedir);

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engine_info->file_name, tempdir);

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211

break;

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212

}

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engine_info = engine_info->next;

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214

}

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if(engine_info == NULL){

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

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return -1;

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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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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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return false;

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}

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return true;

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}

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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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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){

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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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return -1;

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}

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/* Create new GPGME "context" */

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rc = gpgme_new(&ctx);

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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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plaintext_length = -1;

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goto decrypt_end;

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}

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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(ctx, dh_crypto, dh_plain);

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

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if (rc != GPG_ERR_NO_ERROR){

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fprintf(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){

279

gpgme_decrypt_result_t result;

280

result = gpgme_op_decrypt_result(mc->ctx);

281

if (result == NULL){

282

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

283

} else {

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

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result->unsupported_algorithm);

286

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

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result->wrong_key_usage);

288

if(result->file_name != NULL){

289

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

290

}

291

gpgme_recipient_t recipient;

292

recipient = result->recipients;

293

if(recipient){

294

while(recipient != NULL){

295

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

296

gpgme_pubkey_algo_name(recipient->pubkey_algo));

297

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

298

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

299

recipient->status == GPG_ERR_NO_SECKEY

300

? "No" : "Yes");

301

recipient = recipient->next;

302

}

303

}

304

}

305

}

188

306

goto decrypt_end;

189

307

}

190

308

192

310

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

193

311

}

194

312

195

if (debug){

196

gpgme_decrypt_result_t result;

197

result = gpgme_op_decrypt_result(ctx);

198

if (result == NULL){

199

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

200

} else {

201

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

202

result->unsupported_algorithm);

203

fprintf(stderr, "Wrong key usage: %d\n",

204

result->wrong_key_usage);

205

if(result->file_name != NULL){

206

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

207

}

208

gpgme_recipient_t recipient;

209

recipient = result->recipients;

210

if(recipient){

211

while(recipient != NULL){

212

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

213

gpgme_pubkey_algo_name(recipient->pubkey_algo));

214

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

215

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

216

recipient->status == GPG_ERR_NO_SECKEY

217

? "No" : "Yes");

218

recipient = recipient->next;

219

}

220

}

221

}

222

}

223

224

313

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

225

314

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

226

perror("pgpme_data_seek");

315

perror("gpgme_data_seek");

227

316

plaintext_length = -1;

228

317

goto decrypt_end;

229

318

}

230

319

231

320

*plaintext = NULL;

232

321

while(true){

233

plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,

322

plaintext_capacity = adjustbuffer(plaintext,

323

(size_t)plaintext_length,

234

324

plaintext_capacity);

235

325

if (plaintext_capacity == 0){

236

326

perror("adjustbuffer");

252

342

}

253

343

plaintext_length += ret;

254

344

}

255

345

256

346

if(debug){

257

347

fprintf(stderr, "Decrypted password is: ");

258

348

for(ssize_t i = 0; i < plaintext_length; i++){

272

362

}

273

363

274

364

static const char * safer_gnutls_strerror (int value) {

275

const char *ret = gnutls_strerror (value);

365

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

276

366

if (ret == NULL)

277

367

ret = "(unknown)";

278

368

return ret;

285

375

}

286

376

287

377

static int init_gnutls_global(mandos_context *mc,

288

const char *pubkeyfile,

289

const char *seckeyfile){

378

const char *pubkeyfilename,

379

const char *seckeyfilename){

290

380

int ret;

291

381

292

382

if(debug){

293

383

fprintf(stderr, "Initializing GnuTLS\n");

294

384

}

295

296

if ((ret = gnutls_global_init ())

297

!= GNUTLS_E_SUCCESS) {

385

386

ret = gnutls_global_init();

387

if (ret != GNUTLS_E_SUCCESS) {

298

388

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

299

389

safer_gnutls_strerror(ret));

300

390

return -1;

309

399

}

310

400

311

401

/* OpenPGP credentials */

312

if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))

313

!= GNUTLS_E_SUCCESS) {

314

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

402

gnutls_certificate_allocate_credentials(&mc->cred);

403

if (ret != GNUTLS_E_SUCCESS){

404

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

405

warning */

315

406

safer_gnutls_strerror(ret));

407

gnutls_global_deinit ();

316

408

return -1;

317

409

}

318

410

319

411

if(debug){

320

fprintf(stderr, "Attempting to use OpenPGP certificate %s"

321

" and keyfile %s as GnuTLS credentials\n", pubkeyfile,

322

seckeyfile);

412

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

413

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

414

seckeyfilename);

323

415

}

324

416

325

417

ret = gnutls_certificate_set_openpgp_key_file

326

(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);

418

(mc->cred, pubkeyfilename, seckeyfilename,

419

GNUTLS_OPENPGP_FMT_BASE64);

327

420

if (ret != GNUTLS_E_SUCCESS) {

328

421

fprintf(stderr,

329

422

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

330

" '%s')\n", ret, pubkeyfile, seckeyfile);

331

fprintf(stdout, "The GnuTLS error is: %s\n",

423

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

424

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

332

425

safer_gnutls_strerror(ret));

333

return -1;

426

goto globalfail;

334

427

}

335

428

336

429

/* GnuTLS server initialization */

338

431

if (ret != GNUTLS_E_SUCCESS) {

339

432

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

340

433

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

341

return -1;

434

goto globalfail;

342

435

}

343

436

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

344

437

if (ret != GNUTLS_E_SUCCESS) {

345

438

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

346

439

safer_gnutls_strerror(ret));

347

return -1;

440

goto globalfail;

348

441

}

349

442

350

443

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

351

444

352

445

return 0;

446

447

globalfail:

448

449

gnutls_certificate_free_credentials(mc->cred);

450

gnutls_global_deinit();

451

gnutls_dh_params_deinit(mc->dh_params);

452

return -1;

353

453

}

354

454

355

static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){

455

static int init_gnutls_session(mandos_context *mc,

456

gnutls_session_t *session){

356

457

int ret;

357

458

/* GnuTLS session creation */

358

459

ret = gnutls_init(session, GNUTLS_SERVER);

368

469

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

369

470

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

370

471

safer_gnutls_strerror(ret));

472

gnutls_deinit (*session);

371

473

return -1;

372

474

}

373

475

}

377

479

if (ret != GNUTLS_E_SUCCESS) {

378

480

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

379

481

safer_gnutls_strerror(ret));

482

gnutls_deinit (*session);

380

483

return -1;

381

484

}

382

485

398

501

AvahiIfIndex if_index,

399

502

mandos_context *mc){

400

503

int ret, tcp_sd;

401

struct sockaddr_in6 to;

504

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

402

505

char *buffer = NULL;

403

506

char *decrypted_buffer;

404

507

size_t buffer_length = 0;

408

511

int retval = 0;

409

512

char interface[IF_NAMESIZE];

410

513

gnutls_session_t session;

411

gnutls_dh_params_t dh_params;

412

514

413

515

ret = init_gnutls_session (mc, &session);

414

516

if (ret != 0){

416

518

}

417

519

418

520

if(debug){

419

fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",

420

ip, port);

521

fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16

522

"\n", ip, port);

421

523

}

422

524

423

525

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

425

527

perror("socket");

426

528

return -1;

427

529

}

428

530

429

531

if(debug){

430

532

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

431

533

perror("if_indextoname");

434

536

fprintf(stderr, "Binding to interface %s\n", interface);

435

537

}

436

538

437

memset(&to,0,sizeof(to)); /* Spurious warning */

438

to.sin6_family = AF_INET6;

539

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

540

to.in6.sin6_family = AF_INET6;

439

541

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

440

542

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

441

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

543

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

442

544

if (ret < 0 ){

443

545

perror("inet_pton");

444

546

return -1;

447

549

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

448

550

return -1;

449

551

}

450

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

552

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

451

553

452

to.sin6_scope_id = (uint32_t)if_index;

554

to.in6.sin6_scope_id = (uint32_t)if_index;

453

555

454

556

if(debug){

455

fprintf(stderr, "Connection to: %s, port %d\n", ip, port);

557

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

558

port);

456

559

char addrstr[INET6_ADDRSTRLEN] = "";

457

if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,

560

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

458

561

sizeof(addrstr)) == NULL){

459

562

perror("inet_ntop");

460

563

} else {

464

567

}

465

568

}

466

569

467

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

570

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

468

571

if (ret < 0){

469

572

perror("connect");

470

573

return -1;

471

574

}

472

575

473

576

const char *out = mandos_protocol_version;

474

577

written = 0;

475

578

while (true){

493

596

}

494

597

}

495

598

}

496

599

497

600

if(debug){

498

601

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

499

602

}

500

603

501

604

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

502

605

503

ret = gnutls_handshake (session);

606

do{

607

ret = gnutls_handshake (session);

608

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

504

609

505

610

if (ret != GNUTLS_E_SUCCESS){

506

611

if(debug){

517

622

fprintf(stderr, "Retrieving pgp encrypted password from %s\n",

518

623

ip);

519

624

}

520

625

521

626

while(true){

522

buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);

627

buffer_capacity = adjustbuffer(&buffer, buffer_length,

628

buffer_capacity);

523

629

if (buffer_capacity == 0){

524

630

perror("adjustbuffer");

525

631

retval = -1;

537

643

case GNUTLS_E_AGAIN:

538

644

break;

539

645

case GNUTLS_E_REHANDSHAKE:

540

ret = gnutls_handshake (session);

646

do{

647

ret = gnutls_handshake (session);

648

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

541

649

if (ret < 0){

542

650

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

543

651

gnutls_perror (ret);

564

672

gnutls_bye (session, GNUTLS_SHUT_RDWR);

565

673

566

674

if (buffer_length > 0){

567

decrypted_buffer_size = pgp_packet_decrypt(buffer,

675

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

568

676

buffer_length,

569

&decrypted_buffer,

570

keydir);

677

&decrypted_buffer);

571

678

if (decrypted_buffer_size >= 0){

572

679

written = 0;

573

680

while(written < (size_t) decrypted_buffer_size){

588

695

} else {

589

696

retval = -1;

590

697

}

698

} else {

699

retval = -1;

591

700

}

592

701

593

702

/* Shutdown procedure */

594

703

595

704

mandos_end:

596

705

free(buffer);

597

close(tcp_sd);

706

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

707

if(ret == -1){

708

perror("close");

709

}

598

710

gnutls_deinit (session);

599

gnutls_certificate_free_credentials (mc->cred);

600

gnutls_global_deinit ();

601

711

return retval;

602

712

}

603

713

616

726

flags,

617

727

void* userdata) {

618

728

mandos_context *mc = userdata;

619

assert(r); /* Spurious warning */

729

assert(r);

620

730

621

731

/* Called whenever a service has been resolved successfully or

622

732

timed out */

634

744

char ip[AVAHI_ADDRESS_STR_MAX];

635

745

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

636

746

if(debug){

637

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

638

" port %d\n", name, host_name, ip, interface, port);

747

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

748

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

749

interface, port);

639

750

}

640

751

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

641

752

if (ret == 0){

642

exit(EXIT_SUCCESS);

753

avahi_simple_poll_quit(mc->simple_poll);

643

754

}

644

755

}

645

756

}

657

768

flags,

658

769

void* userdata) {

659

770

mandos_context *mc = userdata;

660

assert(b); /* Spurious warning */

771

assert(b);

661

772

662

773

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

663

774

is removed from the LAN */

697

808

}

698

809

}

699

810

700

/* Combines file name and path and returns the malloced new

701

string. some sane checks could/should be added */

702

static const char *combinepath(const char *first, const char *second){

703

size_t f_len = strlen(first);

704

size_t s_len = strlen(second);

705

char *tmp = malloc(f_len + s_len + 2);

706

if (tmp == NULL){

707

return NULL;

708

}

709

if(f_len > 0){

710

memcpy(tmp, first, f_len); /* Spurious warning */

711

}

712

tmp[f_len] = '/';

713

if(s_len > 0){

714

memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */

715

}

716

tmp[f_len + 1 + s_len] = '\0';

717

return tmp;

718

}

719

720

721

811

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

722

812

AvahiSServiceBrowser *sb = NULL;

723

813

int error;

729

819

uid_t uid;

730

820

gid_t gid;

731

821

char *connect_to = NULL;

822

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

732

823

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

733

const char *pubkeyfile = "pubkey.txt";

734

const char *seckeyfile = "seckey.txt";

824

const char *seckey = PATHDIR "/" SECKEY;

825

const char *pubkey = PATHDIR "/" PUBKEY;

826

735

827

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

736

.dh_bits = 1024, .priority = "SECURE256"};

828

.dh_bits = 1024, .priority = "SECURE256"

829

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

830

bool gnutls_initalized = false;

831

bool gpgme_initalized = false;

737

832

738

833

{

739

834

struct argp_option options[] = {

740

835

{ .name = "debug", .key = 128,

741

836

.doc = "Debug mode", .group = 3 },

742

837

{ .name = "connect", .key = 'c',

743

.arg = "IP",

744

.doc = "Connect directly to a sepcified mandos server", .group = 1 },

838

.arg = "ADDRESS:PORT",

839

.doc = "Connect directly to a specific Mandos server",

840

.group = 1 },

745

841

{ .name = "interface", .key = 'i',

746

.arg = "INTERFACE",

747

.doc = "Interface that Avahi will conntect through", .group = 1 },

748

{ .name = "keydir", .key = 'd',

749

.arg = "KEYDIR",

750

.doc = "Directory where the openpgp keyring is", .group = 1 },

842

.arg = "NAME",

843

.doc = "Interface that will be used to search for Mandos"

844

" servers",

845

.group = 1 },

751

846

{ .name = "seckey", .key = 's',

752

.arg = "SECKEY",

753

.doc = "Secret openpgp key for gnutls authentication", .group = 1 },

847

.arg = "FILE",

848

.doc = "OpenPGP secret key file base name",

849

.group = 1 },

754

850

{ .name = "pubkey", .key = 'p',

755

.arg = "PUBKEY",

756

.doc = "Public openpgp key for gnutls authentication", .group = 2 },

851

.arg = "FILE",

852

.doc = "OpenPGP public key file base name",

853

.group = 2 },

757

854

{ .name = "dh-bits", .key = 129,

758

855

.arg = "BITS",

759

.doc = "dh-bits to use in gnutls communication", .group = 2 },

856

.doc = "Bit length of the prime number used in the"

857

" Diffie-Hellman key exchange",

858

.group = 2 },

760

859

{ .name = "priority", .key = 130,

761

.arg = "PRIORITY",

762

.doc = "GNUTLS priority", .group = 1 },

860

.arg = "STRING",

861

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

862

.group = 1 },

763

863

{ .name = NULL }

764

864

};

765

766

865

767

error_t parse_opt (int key, char *arg, struct argp_state *state) {

768

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

769

pointer to our plugin list pointer. */

866

error_t parse_opt (int key, char *arg,

867

struct argp_state *state) {

868

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

869

a pointer to our plugin list pointer. */

770

870

switch (key) {

771

case 128:

871

case 128: /* --debug */

772

872

debug = true;

773

873

break;

774

case 'c':

874

case 'c': /* --connect */

775

875

connect_to = arg;

776

876

break;

777

case 'i':

877

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

778

878

interface = arg;

779

879

break;

780

case 'd':

781

keydir = arg;

782

break;

783

case 's':

784

seckeyfile = arg;

785

break;

786

case 'p':

787

pubkeyfile = arg;

788

break;

789

case 129:

880

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

881

seckey = arg;

882

break;

883

case 'p': /* --pubkey */

884

pubkey = arg;

885

break;

886

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

790

887

errno = 0;

791

888

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

792

889

if (errno){

794

891

exit(EXIT_FAILURE);

795

892

}

796

893

break;

797

case 130:

894

case 130: /* --priority */

798

895

mc.priority = arg;

799

896

break;

800

897

case ARGP_KEY_ARG:

801

898

argp_usage (state);

899

case ARGP_KEY_END:

802

900

break;

803

case ARGP_KEY_END:

804

break;

805

901

default:

806

902

return ARGP_ERR_UNKNOWN;

807

903

}

808

904

return 0;

809

905

}

810

906

811

907

struct argp argp = { .options = options, .parser = parse_opt,

812

908

.args_doc = "",

813

.doc = "Mandos client -- Get and decrypt passwords from mandos server" };

814

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

815

}

816

817

pubkeyfile = combinepath(keydir, pubkeyfile);

818

if (pubkeyfile == NULL){

819

perror("combinepath");

820

exitcode = EXIT_FAILURE;

821

goto end;

822

}

823

824

seckeyfile = combinepath(keydir, seckeyfile);

825

if (seckeyfile == NULL){

826

perror("combinepath");

827

goto end;

828

}

829

830

ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);

831

if (ret == -1){

832

fprintf(stderr, "init_gnutls_global\n");

833

goto end;

834

}

835

909

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

910

" passwords from a Mandos server" };

911

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

912

if (ret == ARGP_ERR_UNKNOWN){

913

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

914

exitcode = EXIT_FAILURE;

915

goto end;

916

}

917

}

918

919

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

920

{

921

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

922

if(sd < 0) {

923

perror("socket");

924

exitcode = EXIT_FAILURE;

925

goto end;

926

}

927

strcpy(network.ifr_name, interface);

928

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

929

if(ret == -1){

930

perror("ioctl SIOCGIFFLAGS");

931

exitcode = EXIT_FAILURE;

932

goto end;

933

}

934

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

935

network.ifr_flags |= IFF_UP;

936

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

937

if(ret == -1){

938

perror("ioctl SIOCSIFFLAGS");

939

exitcode = EXIT_FAILURE;

940

goto end;

941

}

942

}

943

ret = TEMP_FAILURE_RETRY(close(sd));

944

if(ret == -1){

945

perror("close");

946

}

947

}

948

836

949

uid = getuid();

837

950

gid = getgid();

838

951

839

952

ret = setuid(uid);

840

953

if (ret == -1){

841

954

perror("setuid");

846

959

perror("setgid");

847

960

}

848

961

962

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

963

if (ret == -1){

964

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

965

exitcode = EXIT_FAILURE;

966

goto end;

967

} else {

968

gnutls_initalized = true;

969

}

970

971

if(mkdtemp(tempdir) == NULL){

972

perror("mkdtemp");

973

tempdir[0] = '\0';

974

goto end;

975

}

976

977

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

978

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

979

exitcode = EXIT_FAILURE;

980

goto end;

981

} else {

982

gpgme_initalized = true;

983

}

984

849

985

if_index = (AvahiIfIndex) if_nametoindex(interface);

850

986

if(if_index == 0){

851

987

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

879

1015

goto end;

880

1016

}

881

1017

882

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

883

{

884

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

885

if(sd < 0) {

886

perror("socket");

887

exitcode = EXIT_FAILURE;

888

goto end;

889

}

890

strcpy(network.ifr_name, interface); /* Spurious warning */

891

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

892

if(ret == -1){

893

perror("ioctl SIOCGIFFLAGS");

894

exitcode = EXIT_FAILURE;

895

goto end;

896

}

897

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

898

network.ifr_flags |= IFF_UP;

899

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

900

if(ret == -1){

901

perror("ioctl SIOCSIFFLAGS");

902

exitcode = EXIT_FAILURE;

903

goto end;

904

}

905

}

906

close(sd);

907

}

908

909

1018

if (not debug){

910

1019

avahi_set_log_function(empty_log);

911

1020

}

921

1030

exitcode = EXIT_FAILURE;

922

1031

goto end;

923

1032

}

924

1033

925

1034

{

926

1035

AvahiServerConfig config;

927

1036

/* Do not publish any local Zeroconf records */

930

1039

config.publish_addresses = 0;

931

1040

config.publish_workstation = 0;

932

1041

config.publish_domain = 0;

933

1042

934

1043

/* Allocate a new server */

935

1044

mc.server = avahi_server_new(avahi_simple_poll_get

936

1045

(mc.simple_poll), &config, NULL,

937

1046

NULL, &error);

938

1047

939

1048

/* Free the Avahi configuration data */

940

1049

avahi_server_config_free(&config);

941

1050

}

961

1070

}

962

1071

963

1072

/* Run the main loop */

964

1073

965

1074

if (debug){

966

1075

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

967

1076

}

969

1078

avahi_simple_poll_loop(mc.simple_poll);

970

1079

971

1080

end:

972

1081

973

1082

if (debug){

974

1083

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

975

1084

}

980

1089

981

1090

if (mc.server != NULL)

982

1091

avahi_server_free(mc.server);

983

1092

984

1093

if (mc.simple_poll != NULL)

985

1094

avahi_simple_poll_free(mc.simple_poll);

986

free(pubkeyfile);

987

free(seckeyfile);

988

1095

1096

if (gnutls_initalized){

1097

gnutls_certificate_free_credentials(mc.cred);

1098

gnutls_global_deinit ();

1099

gnutls_dh_params_deinit(mc.dh_params);

1100

}

1101

1102

if(gpgme_initalized){

1103

gpgme_release(mc.ctx);

1104

}

1105

1106

/* Removes the temp directory used by GPGME */

1107

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

1108

DIR *d;

1109

struct dirent *direntry;

1110

d = opendir(tempdir);

1111

if(d == NULL){

1112

perror("opendir");

1113

} else {

1114

while(true){

1115

direntry = readdir(d);

1116

if(direntry == NULL){

1117

break;

1118

}

1119

if (direntry->d_type == DT_REG){

1120

char *fullname = NULL;

1121

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

1122

direntry->d_name);

1123

if(ret < 0){

1124

perror("asprintf");

1125

continue;

1126

}

1127

ret = unlink(fullname);

1128

if(ret == -1){

1129

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

1130

fullname, strerror(errno));

1131

}

1132

free(fullname);

1133

}

1134

}

1135

closedir(d);

1136

}

1137

ret = rmdir(tempdir);

1138

if(ret == -1){

1139

perror("rmdir");

1140

}

1141

}

1142

989

1143

return exitcode;

990

1144

}