/mandos/trunk : revision 252

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

10

*

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* Everything else is

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13

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*

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15

* This program is free software: you can redistribute it and/or

15

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* modify it under the terms of the GNU General Public License as

32

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#define _LARGEFILE_SOURCE

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34

#define _FILE_OFFSET_BITS 64

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35

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

36

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

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37

#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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82

#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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102

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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

bool debug = false;

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

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110

static const char mandos_protocol_version[] = "1";

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const char *argp_program_version = "mandosclient 0.9";

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

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112

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

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113

83

114

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

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119

unsigned int dh_bits;

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120

gnutls_dh_params_t dh_params;

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121

const char *priority;

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gpgme_ctx_t ctx;

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123

} mandos_context;

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124

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/*

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140

}

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141

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/*

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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;

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gpgme_ctx_t ctx;

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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;

120

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;

124

149

gpgme_engine_info_t engine_info;

125

150

151

152

/*

153

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

154

*/

155

bool import_key(const char *filename){

156

int fd;

157

gpgme_data_t pgp_data;

158

159

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

160

if(fd == -1){

161

perror("open");

162

return false;

163

}

164

165

rc = gpgme_data_new_from_fd(&pgp_data, fd);

166

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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172

rc = gpgme_op_import(mc->ctx, pgp_data);

173

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;

177

}

178

179

ret = TEMP_FAILURE_RETRY(close(fd));

180

if(ret == -1){

181

perror("close");

182

}

183

gpgme_data_release(pgp_data);

184

return true;

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}

186

126

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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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189

}

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130

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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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139

/* 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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201

rc = gpgme_get_engine_info (&engine_info);

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if (rc != GPG_ERR_NO_ERROR){

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203

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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206

}

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while(engine_info != NULL){

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208

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

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209

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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}

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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;

216

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

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return false;

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}

219

220

/* Create new GPGME "context" */

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

222

if (rc != GPG_ERR_NO_ERROR){

223

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

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gpgme_strsource(rc), gpgme_strerror(rc));

225

return false;

226

}

227

228

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

238

*/

239

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){

243

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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251

}

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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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186

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

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data buffer */

188

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;

278

if (debug){

279

gpgme_decrypt_result_t result;

280

result = gpgme_op_decrypt_result(mc->ctx);

281

if (result == NULL){

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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

}

193

306

goto decrypt_end;

194

307

}

195

308

197

310

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

198

311

}

199

312

200

if (debug){

201

gpgme_decrypt_result_t result;

202

result = gpgme_op_decrypt_result(ctx);

203

if (result == NULL){

204

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

205

} else {

206

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

207

result->unsupported_algorithm);

208

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

209

result->wrong_key_usage);

210

if(result->file_name != NULL){

211

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

212

}

213

gpgme_recipient_t recipient;

214

recipient = result->recipients;

215

if(recipient){

216

while(recipient != NULL){

217

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

218

gpgme_pubkey_algo_name(recipient->pubkey_algo));

219

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

220

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

221

recipient->status == GPG_ERR_NO_SECKEY

222

? "No" : "Yes");

223

recipient = recipient->next;

224

}

225

}

226

}

227

}

228

229

313

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

230

314

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

231

perror("pgpme_data_seek");

315

perror("gpgme_data_seek");

232

316

plaintext_length = -1;

233

317

goto decrypt_end;

234

318

}

258

342

}

259

343

plaintext_length += ret;

260

344

}

261

345

262

346

if(debug){

263

347

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

264

348

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

278

362

}

279

363

280

364

static const char * safer_gnutls_strerror (int value) {

281

const char *ret = gnutls_strerror (value);

365

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

282

366

if (ret == NULL)

283

367

ret = "(unknown)";

284

368

return ret;

291

375

}

292

376

293

377

static int init_gnutls_global(mandos_context *mc,

294

const char *pubkeyfile,

295

const char *seckeyfile){

378

const char *pubkeyfilename,

379

const char *seckeyfilename){

296

380

int ret;

297

381

298

382

if(debug){

299

383

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

300

384

}

301

302

if ((ret = gnutls_global_init ())

303

!= GNUTLS_E_SUCCESS) {

385

386

ret = gnutls_global_init();

387

if (ret != GNUTLS_E_SUCCESS) {

304

388

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

305

389

safer_gnutls_strerror(ret));

306

390

return -1;

315

399

}

316

400

317

401

/* OpenPGP credentials */

318

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

319

!= GNUTLS_E_SUCCESS) {

320

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 */

321

406

safer_gnutls_strerror(ret));

322

407

gnutls_global_deinit ();

323

408

return -1;

324

409

}

325

410

326

411

if(debug){

327

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

328

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

329

seckeyfile);

412

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

413

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

414

seckeyfilename);

330

415

}

331

416

332

417

ret = gnutls_certificate_set_openpgp_key_file

333

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

418

(mc->cred, pubkeyfilename, seckeyfilename,

419

GNUTLS_OPENPGP_FMT_BASE64);

334

420

if (ret != GNUTLS_E_SUCCESS) {

335

421

fprintf(stderr,

336

422

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

337

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

338

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

423

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

424

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

339

425

safer_gnutls_strerror(ret));

340

426

goto globalfail;

341

427

}

355

441

}

356

442

357

443

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

358

444

359

445

return 0;

360

446

361

447

globalfail:

362

363

gnutls_certificate_free_credentials (mc->cred);

364

gnutls_global_deinit ();

448

449

gnutls_certificate_free_credentials(mc->cred);

450

gnutls_global_deinit();

451

gnutls_dh_params_deinit(mc->dh_params);

365

452

return -1;

366

367

453

}

368

454

369

455

static int init_gnutls_session(mandos_context *mc,

432

518

}

433

519

434

520

if(debug){

435

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

436

ip, port);

521

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

522

"\n", ip, port);

437

523

}

438

524

439

525

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

441

527

perror("socket");

442

528

return -1;

443

529

}

444

530

445

531

if(debug){

446

532

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

447

533

perror("if_indextoname");

450

536

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

451

537

}

452

538

453

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

539

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

454

540

to.in6.sin6_family = AF_INET6;

455

541

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

456

542

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

463

549

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

464

550

return -1;

465

551

}

466

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

552

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

467

553

468

554

to.in6.sin6_scope_id = (uint32_t)if_index;

469

555

470

556

if(debug){

471

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

557

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

558

port);

472

559

char addrstr[INET6_ADDRSTRLEN] = "";

473

560

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

474

561

sizeof(addrstr)) == NULL){

485

572

perror("connect");

486

573

return -1;

487

574

}

488

575

489

576

const char *out = mandos_protocol_version;

490

577

written = 0;

491

578

while (true){

509

596

}

510

597

}

511

598

}

512

599

513

600

if(debug){

514

601

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

515

602

}

516

603

517

604

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

518

605

519

ret = gnutls_handshake (session);

606

do{

607

ret = gnutls_handshake (session);

608

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

520

609

521

610

if (ret != GNUTLS_E_SUCCESS){

522

611

if(debug){

533

622

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

534

623

ip);

535

624

}

536

625

537

626

while(true){

538

627

buffer_capacity = adjustbuffer(&buffer, buffer_length,

539

628

buffer_capacity);

554

643

case GNUTLS_E_AGAIN:

555

644

break;

556

645

case GNUTLS_E_REHANDSHAKE:

557

ret = gnutls_handshake (session);

646

do{

647

ret = gnutls_handshake (session);

648

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

558

649

if (ret < 0){

559

650

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

560

651

gnutls_perror (ret);

581

672

gnutls_bye (session, GNUTLS_SHUT_RDWR);

582

673

583

674

if (buffer_length > 0){

584

decrypted_buffer_size = pgp_packet_decrypt(buffer,

675

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

585

676

buffer_length,

586

&decrypted_buffer,

587

keydir);

677

&decrypted_buffer);

588

678

if (decrypted_buffer_size >= 0){

589

679

written = 0;

590

680

while(written < (size_t) decrypted_buffer_size){

605

695

} else {

606

696

retval = -1;

607

697

}

698

} else {

699

retval = -1;

608

700

}

609

701

610

702

/* Shutdown procedure */

611

703

612

704

mandos_end:

613

705

free(buffer);

614

close(tcp_sd);

706

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

707

if(ret == -1){

708

perror("close");

709

}

615

710

gnutls_deinit (session);

616

711

return retval;

617

712

}

631

726

flags,

632

727

void* userdata) {

633

728

mandos_context *mc = userdata;

634

assert(r); /* Spurious warning */

729

assert(r);

635

730

636

731

/* Called whenever a service has been resolved successfully or

637

732

timed out */

649

744

char ip[AVAHI_ADDRESS_STR_MAX];

650

745

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

651

746

if(debug){

652

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

653

" 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);

654

750

}

655

751

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

656

752

if (ret == 0){

657

exit(EXIT_SUCCESS);

753

avahi_simple_poll_quit(mc->simple_poll);

658

754

}

659

755

}

660

756

}

672

768

flags,

673

769

void* userdata) {

674

770

mandos_context *mc = userdata;

675

assert(b); /* Spurious warning */

771

assert(b);

676

772

677

773

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

678

774

is removed from the LAN */

712

808

}

713

809

}

714

810

715

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

716

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

717

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

718

size_t f_len = strlen(first);

719

size_t s_len = strlen(second);

720

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

721

if (tmp == NULL){

722

return NULL;

723

}

724

if(f_len > 0){

725

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

726

}

727

tmp[f_len] = '/';

728

if(s_len > 0){

729

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

730

}

731

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

732

return tmp;

733

}

734

735

736

811

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

737

812

AvahiSServiceBrowser *sb = NULL;

738

813

int error;

744

819

uid_t uid;

745

820

gid_t gid;

746

821

char *connect_to = NULL;

822

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

747

823

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

748

const char *pubkeyfile = "pubkey.txt";

749

const char *seckeyfile = "seckey.txt";

824

const char *seckey = PATHDIR "/" SECKEY;

825

const char *pubkey = PATHDIR "/" PUBKEY;

826

750

827

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

751

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

828

.dh_bits = 1024, .priority = "SECURE256"

829

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

752

830

bool gnutls_initalized = false;

831

bool gpgme_initalized = false;

753

832

754

833

{

755

834

struct argp_option options[] = {

756

835

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

757

836

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

758

837

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

759

.arg = "IP",

760

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

838

.arg = "ADDRESS:PORT",

839

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

761

840

.group = 1 },

762

841

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

763

.arg = "INTERFACE",

764

.doc = "Interface that Avahi will conntect through",

765

.group = 1 },

766

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

767

.arg = "KEYDIR",

768

.doc = "Directory where the openpgp keyring is",

842

.arg = "NAME",

843

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

844

" servers",

769

845

.group = 1 },

770

846

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

771

.arg = "SECKEY",

772

.doc = "Secret openpgp key for gnutls authentication",

847

.arg = "FILE",

848

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

773

849

.group = 1 },

774

850

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

775

.arg = "PUBKEY",

776

.doc = "Public openpgp key for gnutls authentication",

851

.arg = "FILE",

852

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

777

853

.group = 2 },

778

854

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

779

855

.arg = "BITS",

780

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

856

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

857

" Diffie-Hellman key exchange",

781

858

.group = 2 },

782

859

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

783

.arg = "PRIORITY",

784

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

860

.arg = "STRING",

861

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

862

.group = 1 },

785

863

{ .name = NULL }

786

864

};

787

788

865

789

866

error_t parse_opt (int key, char *arg,

790

867

struct argp_state *state) {

791

868

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

792

869

a pointer to our plugin list pointer. */

793

870

switch (key) {

794

case 128:

871

case 128: /* --debug */

795

872

debug = true;

796

873

break;

797

case 'c':

874

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

798

875

connect_to = arg;

799

876

break;

800

case 'i':

877

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

801

878

interface = arg;

802

879

break;

803

case 'd':

804

keydir = arg;

805

break;

806

case 's':

807

seckeyfile = arg;

808

break;

809

case 'p':

810

pubkeyfile = arg;

811

break;

812

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 */

813

887

errno = 0;

814

888

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

815

889

if (errno){

817

891

exit(EXIT_FAILURE);

818

892

}

819

893

break;

820

case 130:

894

case 130: /* --priority */

821

895

mc.priority = arg;

822

896

break;

823

897

case ARGP_KEY_ARG:

824

898

argp_usage (state);

899

case ARGP_KEY_END:

825

900

break;

826

case ARGP_KEY_END:

827

break;

828

901

default:

829

902

return ARGP_ERR_UNKNOWN;

830

903

}

831

904

return 0;

832

905

}

833

906

834

907

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

835

908

.args_doc = "",

836

909

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

837

" passwords from mandos server" };

838

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

839

}

840

841

pubkeyfile = combinepath(keydir, pubkeyfile);

842

if (pubkeyfile == NULL){

843

perror("combinepath");

844

exitcode = EXIT_FAILURE;

845

goto end;

846

}

847

848

seckeyfile = combinepath(keydir, seckeyfile);

849

if (seckeyfile == NULL){

850

perror("combinepath");

851

goto end;

852

}

853

854

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

855

if (ret == -1){

856

fprintf(stderr, "init_gnutls_global\n");

857

goto end;

858

} else {

859

gnutls_initalized = true;

860

}

861

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

862

949

uid = getuid();

863

950

gid = getgid();

864

951

865

952

ret = setuid(uid);

866

953

if (ret == -1){

867

954

perror("setuid");

872

959

perror("setgid");

873

960

}

874

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

875

985

if_index = (AvahiIfIndex) if_nametoindex(interface);

876

986

if(if_index == 0){

877

987

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

905

1015

goto end;

906

1016

}

907

1017

908

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

909

{

910

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

911

if(sd < 0) {

912

perror("socket");

913

exitcode = EXIT_FAILURE;

914

goto end;

915

}

916

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

917

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

918

if(ret == -1){

919

perror("ioctl SIOCGIFFLAGS");

920

exitcode = EXIT_FAILURE;

921

goto end;

922

}

923

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

924

network.ifr_flags |= IFF_UP;

925

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

926

if(ret == -1){

927

perror("ioctl SIOCSIFFLAGS");

928

exitcode = EXIT_FAILURE;

929

goto end;

930

}

931

}

932

close(sd);

933

}

934

935

1018

if (not debug){

936

1019

avahi_set_log_function(empty_log);

937

1020

}

947

1030

exitcode = EXIT_FAILURE;

948

1031

goto end;

949

1032

}

950

1033

951

1034

{

952

1035

AvahiServerConfig config;

953

1036

/* Do not publish any local Zeroconf records */

956

1039

config.publish_addresses = 0;

957

1040

config.publish_workstation = 0;

958

1041

config.publish_domain = 0;

959

1042

960

1043

/* Allocate a new server */

961

1044

mc.server = avahi_server_new(avahi_simple_poll_get

962

1045

(mc.simple_poll), &config, NULL,

963

1046

NULL, &error);

964

1047

965

1048

/* Free the Avahi configuration data */

966

1049

avahi_server_config_free(&config);

967

1050

}

987

1070

}

988

1071

989

1072

/* Run the main loop */

990

1073

991

1074

if (debug){

992

1075

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

993

1076

}

995

1078

avahi_simple_poll_loop(mc.simple_poll);

996

1079

997

1080

end:

998

1081

999

1082

if (debug){

1000

1083

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

1001

1084

}

1006

1089

1007

1090

if (mc.server != NULL)

1008

1091

avahi_server_free(mc.server);

1009

1092

1010

1093

if (mc.simple_poll != NULL)

1011

1094

avahi_simple_poll_free(mc.simple_poll);

1012

free(pubkeyfile);

1013

free(seckeyfile);

1014

1095

1015

1096

if (gnutls_initalized){

1016

gnutls_certificate_free_credentials (mc.cred);

1097

gnutls_certificate_free_credentials(mc.cred);

1017

1098

gnutls_global_deinit ();

1018

}

1019

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

1020

1143

return exitcode;

1021

1144

}