/mandos/trunk : revision 24.1.14

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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(), asprintf() */

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

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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 <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 <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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#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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SIOCSIFFLAGS */

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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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#include <avahi-common/malloc.h>

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#include <avahi-common/error.h>

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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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/* 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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#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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/* GPGME */

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

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#include <gpgme.h>

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103

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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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109

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

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const char *argp_program_version = "mandosclient 0.9";

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

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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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,

131

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size_t buffer_capacity){

132

95

if (buffer_length + BUFFER_SIZE > buffer_capacity){

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103

}

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104

142

105

/*

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* Initialize GPGME.

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* Decrypt OpenPGP data using keyrings in HOMEDIR.

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* Returns -1 on error

144

108

*/

145

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

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const char *pubkey, const char *tempdir){

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int ret;

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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;

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gpgme_ctx_t ctx;

148

115

gpgme_error_t rc;

116

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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120

151

152

/*

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

154

*/

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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));

160

if(fd == -1){

161

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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179

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

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if(ret == -1){

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perror("close");

182

}

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gpgme_data_release(pgp_data);

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return true;

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}

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187

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if (debug){

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

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

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}

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191

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/* Init GPGME */

194

128

if (rc != GPG_ERR_NO_ERROR){

195

129

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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return -1;

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132

}

199

133

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

134

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

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rc = gpgme_get_engine_info (&engine_info);

202

136

if (rc != GPG_ERR_NO_ERROR){

203

137

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;

139

return -1;

206

140

}

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while(engine_info != NULL){

208

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if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

209

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gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

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engine_info->file_name, tempdir);

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engine_info->file_name, homedir);

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break;

212

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}

213

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engine_info = engine_info->next;

214

148

}

215

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if(engine_info == NULL){

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

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return false;

218

}

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

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return -1;

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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);

174

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

272

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data buffer */

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

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rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

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184

if (rc != GPG_ERR_NO_ERROR){

275

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

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186

gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

278

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 {

284

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

285

result->unsupported_algorithm);

286

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

287

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

}

306

188

goto decrypt_end;

307

189

}

308

190

310

192

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

311

193

}

312

194

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

313

224

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

314

225

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

315

perror("gpgme_data_seek");

226

perror("pgpme_data_seek");

316

227

plaintext_length = -1;

317

228

goto decrypt_end;

318

229

}

319

230

320

231

*plaintext = NULL;

321

232

while(true){

322

plaintext_capacity = adjustbuffer(plaintext,

323

(size_t)plaintext_length,

233

plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,

324

234

plaintext_capacity);

325

235

if (plaintext_capacity == 0){

326

236

perror("adjustbuffer");

342

252

}

343

253

plaintext_length += ret;

344

254

}

345

255

346

256

if(debug){

347

257

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

348

258

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

362

272

}

363

273

364

274

static const char * safer_gnutls_strerror (int value) {

365

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

275

const char *ret = gnutls_strerror (value);

366

276

if (ret == NULL)

367

277

ret = "(unknown)";

368

278

return ret;

375

285

}

376

286

377

287

static int init_gnutls_global(mandos_context *mc,

378

const char *pubkeyfilename,

379

const char *seckeyfilename){

288

const char *pubkeyfile,

289

const char *seckeyfile){

380

290

int ret;

381

291

382

292

if(debug){

383

293

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

384

294

}

385

386

ret = gnutls_global_init();

387

if (ret != GNUTLS_E_SUCCESS) {

295

296

if ((ret = gnutls_global_init ())

297

!= GNUTLS_E_SUCCESS) {

388

298

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

389

299

safer_gnutls_strerror(ret));

390

300

return -1;

399

309

}

400

310

401

311

/* OpenPGP credentials */

402

gnutls_certificate_allocate_credentials(&mc->cred);

403

if (ret != GNUTLS_E_SUCCESS){

404

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

405

warning */

312

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

313

!= GNUTLS_E_SUCCESS) {

314

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

406

315

safer_gnutls_strerror(ret));

407

gnutls_global_deinit ();

408

316

return -1;

409

317

}

410

318

411

319

if(debug){

412

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

413

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

414

seckeyfilename);

320

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

321

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

322

seckeyfile);

415

323

}

416

324

417

325

ret = gnutls_certificate_set_openpgp_key_file

418

(mc->cred, pubkeyfilename, seckeyfilename,

419

GNUTLS_OPENPGP_FMT_BASE64);

326

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

420

327

if (ret != GNUTLS_E_SUCCESS) {

421

328

fprintf(stderr,

422

329

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

423

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

424

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

330

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

331

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

425

332

safer_gnutls_strerror(ret));

426

goto globalfail;

333

return -1;

427

334

}

428

335

429

336

/* GnuTLS server initialization */

431

338

if (ret != GNUTLS_E_SUCCESS) {

432

339

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

433

340

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

434

goto globalfail;

341

return -1;

435

342

}

436

343

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

437

344

if (ret != GNUTLS_E_SUCCESS) {

438

345

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

439

346

safer_gnutls_strerror(ret));

440

goto globalfail;

347

return -1;

441

348

}

442

349

443

350

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

444

351

445

352

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;

453

353

}

454

354

455

static int init_gnutls_session(mandos_context *mc,

456

gnutls_session_t *session){

355

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

457

356

int ret;

458

357

/* GnuTLS session creation */

459

358

ret = gnutls_init(session, GNUTLS_SERVER);

469

368

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

470

369

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

471

370

safer_gnutls_strerror(ret));

472

gnutls_deinit (*session);

473

371

return -1;

474

372

}

475

373

}

479

377

if (ret != GNUTLS_E_SUCCESS) {

480

378

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

481

379

safer_gnutls_strerror(ret));

482

gnutls_deinit (*session);

483

380

return -1;

484

381

}

485

382

501

398

AvahiIfIndex if_index,

502

399

mandos_context *mc){

503

400

int ret, tcp_sd;

504

ssize_t sret;

505

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

401

struct sockaddr_in6 to;

506

402

char *buffer = NULL;

507

403

char *decrypted_buffer;

508

404

size_t buffer_length = 0;

512

408

int retval = 0;

513

409

char interface[IF_NAMESIZE];

514

410

gnutls_session_t session;

411

gnutls_dh_params_t dh_params;

515

412

516

413

ret = init_gnutls_session (mc, &session);

517

414

if (ret != 0){

519

416

}

520

417

521

418

if(debug){

522

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

523

"\n", ip, port);

419

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

420

ip, port);

524

421

}

525

422

526

423

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

528

425

perror("socket");

529

426

return -1;

530

427

}

531

428

532

429

if(debug){

533

430

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

534

431

perror("if_indextoname");

537

434

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

538

435

}

539

436

540

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

541

to.in6.sin6_family = AF_INET6;

437

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

438

to.sin6_family = AF_INET6;

542

439

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

543

440

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

544

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

441

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

545

442

if (ret < 0 ){

546

443

perror("inet_pton");

547

444

return -1;

550

447

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

551

448

return -1;

552

449

}

553

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

450

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

554

451

555

to.in6.sin6_scope_id = (uint32_t)if_index;

452

to.sin6_scope_id = (uint32_t)if_index;

556

453

557

454

if(debug){

558

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

559

port);

455

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

560

456

char addrstr[INET6_ADDRSTRLEN] = "";

561

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

457

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

562

458

sizeof(addrstr)) == NULL){

563

459

perror("inet_ntop");

564

460

} else {

568

464

}

569

465

}

570

466

571

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

467

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

572

468

if (ret < 0){

573

469

perror("connect");

574

470

return -1;

575

471

}

576

472

577

473

const char *out = mandos_protocol_version;

578

474

written = 0;

579

475

while (true){

580

476

size_t out_size = strlen(out);

581

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

477

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

582

478

out_size - written));

583

479

if (ret == -1){

584

480

perror("write");

597

493

}

598

494

}

599

495

}

600

496

601

497

if(debug){

602

498

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

603

499

}

604

500

605

501

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

606

502

607

do{

608

ret = gnutls_handshake (session);

609

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

503

ret = gnutls_handshake (session);

610

504

611

505

if (ret != GNUTLS_E_SUCCESS){

612

506

if(debug){

623

517

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

624

518

ip);

625

519

}

626

520

627

521

while(true){

628

buffer_capacity = adjustbuffer(&buffer, buffer_length,

629

buffer_capacity);

522

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

630

523

if (buffer_capacity == 0){

631

524

perror("adjustbuffer");

632

525

retval = -1;

633

526

goto mandos_end;

634

527

}

635

528

636

sret = gnutls_record_recv(session, buffer+buffer_length,

637

BUFFER_SIZE);

638

if (sret == 0){

529

ret = gnutls_record_recv(session, buffer+buffer_length,

530

BUFFER_SIZE);

531

if (ret == 0){

639

532

break;

640

533

}

641

if (sret < 0){

642

switch(sret){

534

if (ret < 0){

535

switch(ret){

643

536

case GNUTLS_E_INTERRUPTED:

644

537

case GNUTLS_E_AGAIN:

645

538

break;

646

539

case GNUTLS_E_REHANDSHAKE:

647

do{

648

ret = gnutls_handshake (session);

649

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

540

ret = gnutls_handshake (session);

650

541

if (ret < 0){

651

542

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

652

543

gnutls_perror (ret);

662

553

goto mandos_end;

663

554

}

664

555

} else {

665

buffer_length += (size_t) sret;

556

buffer_length += (size_t) ret;

666

557

}

667

558

}

668

559

673

564

gnutls_bye (session, GNUTLS_SHUT_RDWR);

674

565

675

566

if (buffer_length > 0){

676

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

567

decrypted_buffer_size = pgp_packet_decrypt(buffer,

677

568

buffer_length,

678

&decrypted_buffer);

569

&decrypted_buffer,

570

keydir);

679

571

if (decrypted_buffer_size >= 0){

680

572

written = 0;

681

573

while(written < (size_t) decrypted_buffer_size){

696

588

} else {

697

589

retval = -1;

698

590

}

699

} else {

700

retval = -1;

701

591

}

702

592

703

593

/* Shutdown procedure */

704

594

705

595

mandos_end:

706

596

free(buffer);

707

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

708

if(ret == -1){

709

perror("close");

710

}

597

close(tcp_sd);

711

598

gnutls_deinit (session);

599

gnutls_certificate_free_credentials (mc->cred);

600

gnutls_global_deinit ();

712

601

return retval;

713

602

}

714

603

727

616

flags,

728

617

void* userdata) {

729

618

mandos_context *mc = userdata;

730

assert(r);

619

assert(r); /* Spurious warning */

731

620

732

621

/* Called whenever a service has been resolved successfully or

733

622

timed out */

745

634

char ip[AVAHI_ADDRESS_STR_MAX];

746

635

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

747

636

if(debug){

748

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

749

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

750

interface, port);

637

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

638

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

751

639

}

752

640

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

753

641

if (ret == 0){

754

avahi_simple_poll_quit(mc->simple_poll);

642

exit(EXIT_SUCCESS);

755

643

}

756

644

}

757

645

}

769

657

flags,

770

658

void* userdata) {

771

659

mandos_context *mc = userdata;

772

assert(b);

660

assert(b); /* Spurious warning */

773

661

774

662

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

775

663

is removed from the LAN */

809

697

}

810

698

}

811

699

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

812

721

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

813

722

AvahiSServiceBrowser *sb = NULL;

814

723

int error;

820

729

uid_t uid;

821

730

gid_t gid;

822

731

char *connect_to = NULL;

823

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

824

732

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

825

const char *seckey = PATHDIR "/" SECKEY;

826

const char *pubkey = PATHDIR "/" PUBKEY;

827

733

const char *pubkeyfile = "pubkey.txt";

734

const char *seckeyfile = "seckey.txt";

828

735

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

829

.dh_bits = 1024, .priority = "SECURE256"

830

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

831

bool gnutls_initalized = false;

832

bool gpgme_initalized = false;

736

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

833

737

834

738

{

835

739

struct argp_option options[] = {

836

740

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

837

741

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

838

742

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

839

.arg = "ADDRESS:PORT",

840

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

841

.group = 1 },

743

.arg = "IP",

744

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

842

745

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

843

.arg = "NAME",

844

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

845

" servers",

846

.group = 1 },

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 },

847

751

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

848

.arg = "FILE",

849

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

850

.group = 1 },

752

.arg = "SECKEY",

753

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

851

754

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

852

.arg = "FILE",

853

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

854

.group = 2 },

755

.arg = "PUBKEY",

756

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

855

757

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

856

758

.arg = "BITS",

857

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

858

" Diffie-Hellman key exchange",

859

.group = 2 },

759

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

860

760

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

861

.arg = "STRING",

862

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

863

.group = 1 },

761

.arg = "PRIORITY",

762

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

864

763

{ .name = NULL }

865

764

};

765

866

766

867

error_t parse_opt (int key, char *arg,

868

struct argp_state *state) {

869

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

870

a pointer to our plugin list pointer. */

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. */

871

770

switch (key) {

872

case 128: /* --debug */

771

case 128:

873

772

debug = true;

874

773

break;

875

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

774

case 'c':

876

775

connect_to = arg;

877

776

break;

878

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

777

case 'i':

879

778

interface = arg;

880

779

break;

881

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

882

seckey = arg;

883

break;

884

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

885

pubkey = arg;

886

break;

887

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

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:

888

790

errno = 0;

889

791

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

890

792

if (errno){

892

794

exit(EXIT_FAILURE);

893

795

}

894

796

break;

895

case 130: /* --priority */

797

case 130:

896

798

mc.priority = arg;

897

799

break;

898

800

case ARGP_KEY_ARG:

899

801

argp_usage (state);

900

case ARGP_KEY_END:

901

802

break;

803

case ARGP_KEY_END:

804

break;

902

805

default:

903

806

return ARGP_ERR_UNKNOWN;

904

807

}

905

808

return 0;

906

809

}

907

810

908

811

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

909

812

.args_doc = "",

910

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

911

" passwords from a Mandos server" };

912

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

913

if (ret == ARGP_ERR_UNKNOWN){

914

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

915

exitcode = EXIT_FAILURE;

916

goto end;

917

}

918

}

919

920

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

921

{

922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

923

if(sd < 0) {

924

perror("socket");

925

exitcode = EXIT_FAILURE;

926

goto end;

927

}

928

strcpy(network.ifr_name, interface);

929

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

930

if(ret == -1){

931

perror("ioctl SIOCGIFFLAGS");

932

exitcode = EXIT_FAILURE;

933

goto end;

934

}

935

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

936

network.ifr_flags |= IFF_UP;

937

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

938

if(ret == -1){

939

perror("ioctl SIOCSIFFLAGS");

940

exitcode = EXIT_FAILURE;

941

goto end;

942

}

943

}

944

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

945

if(ret == -1){

946

perror("close");

947

}

948

}

949

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

950

836

uid = getuid();

951

837

gid = getgid();

952

838

953

839

ret = setuid(uid);

954

840

if (ret == -1){

955

841

perror("setuid");

960

846

perror("setgid");

961

847

}

962

848

963

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

964

if (ret == -1){

965

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

966

exitcode = EXIT_FAILURE;

967

goto end;

968

} else {

969

gnutls_initalized = true;

970

}

971

972

if(mkdtemp(tempdir) == NULL){

973

perror("mkdtemp");

974

tempdir[0] = '\0';

975

goto end;

976

}

977

978

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

979

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

980

exitcode = EXIT_FAILURE;

981

goto end;

982

} else {

983

gpgme_initalized = true;

984

}

985

986

849

if_index = (AvahiIfIndex) if_nametoindex(interface);

987

850

if(if_index == 0){

988

851

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

1016

879

goto end;

1017

880

}

1018

881

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

1019

909

if (not debug){

1020

910

avahi_set_log_function(empty_log);

1021

911

}

1031

921

exitcode = EXIT_FAILURE;

1032

922

goto end;

1033

923

}

1034

924

1035

925

{

1036

926

AvahiServerConfig config;

1037

927

/* Do not publish any local Zeroconf records */

1040

930

config.publish_addresses = 0;

1041

931

config.publish_workstation = 0;

1042

932

config.publish_domain = 0;

1043

933

1044

934

/* Allocate a new server */

1045

935

mc.server = avahi_server_new(avahi_simple_poll_get

1046

936

(mc.simple_poll), &config, NULL,

1047

937

NULL, &error);

1048

938

1049

939

/* Free the Avahi configuration data */

1050

940

avahi_server_config_free(&config);

1051

941

}

1071

961

}

1072

962

1073

963

/* Run the main loop */

1074

964

1075

965

if (debug){

1076

966

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

1077

967

}

1079

969

avahi_simple_poll_loop(mc.simple_poll);

1080

970

1081

971

end:

1082

972

1083

973

if (debug){

1084

974

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

1085

975

}

1090

980

1091

981

if (mc.server != NULL)

1092

982

avahi_server_free(mc.server);

1093

983

1094

984

if (mc.simple_poll != NULL)

1095

985

avahi_simple_poll_free(mc.simple_poll);

1096

1097

if (gnutls_initalized){

1098

gnutls_certificate_free_credentials(mc.cred);

1099

gnutls_global_deinit ();

1100

gnutls_dh_params_deinit(mc.dh_params);

1101

}

1102

1103

if(gpgme_initalized){

1104

gpgme_release(mc.ctx);

1105

}

1106

1107

/* Removes the temp directory used by GPGME */

1108

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

1109

DIR *d;

1110

struct dirent *direntry;

1111

d = opendir(tempdir);

1112

if(d == NULL){

1113

perror("opendir");

1114

} else {

1115

while(true){

1116

direntry = readdir(d);

1117

if(direntry == NULL){

1118

break;

1119

}

1120

if (direntry->d_type == DT_REG){

1121

char *fullname = NULL;

1122

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

1123

direntry->d_name);

1124

if(ret < 0){

1125

perror("asprintf");

1126

continue;

1127

}

1128

ret = unlink(fullname);

1129

if(ret == -1){

1130

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

1131

fullname, strerror(errno));

1132

}

1133

free(fullname);

1134

}

1135

}

1136

closedir(d);

1137

}

1138

ret = rmdir(tempdir);

1139

if(ret == -1){

1140

perror("rmdir");

1141

}

1142

}

1143

986

free(pubkeyfile);

987

free(seckeyfile);

988

1144

989

return exitcode;

1145

990

}