/mandos/release : revision 237.7.240

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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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* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@fukt.bsnet.se>.

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* Contact the authors at <mandos@recompile.se>.

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*/

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/* Needed by GPGME, specifically gpgme_data_seek() */

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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#include <sys/stat.h> /* open() */

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#include <sys/stat.h> /* open(), S_ISREG */

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#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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#include <fcntl.h> /* open() */

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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#include <time.h> /* nanosleep(), time(), sleep() */

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*/

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

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getuid(), getgid(), seteuid(),

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setgid(), pause() */

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

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setgid(), pause(), _exit() */

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

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#include <iso646.h> /* not, or, 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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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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#include <sys/klog.h> /* klogctl() */

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117

init_gnutls_session(),

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118

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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132

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

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133

#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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#define HOOKDIR "/lib/mandos/network-hooks.d"

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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static const char sys_class_net[] = "/sys/class/net";

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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/* Doubly linked list that need to be circularly linked when used */

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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158

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

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160

typedef struct {

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AvahiSimplePoll *simple_poll;

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161

AvahiServer *server;

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162

gnutls_certificate_credentials_t cred;

150

163

unsigned int dh_bits;

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165

const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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170

} mandos_context;

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/* global context so signal handler can reach it*/

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

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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174

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sig_atomic_t quit_now = 0;

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176

int signal_received = 0;

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/* Function to use when printing errors */

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179

void perror_plus(const char *print_text){

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int e = errno;

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fprintf(stderr, "Mandos plugin %s: ",

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182

program_invocation_short_name);

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errno = e;

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184

perror(print_text);

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}

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187

__attribute__((format (gnu_printf, 2, 3), nonnull))

188

int fprintf_plus(FILE *stream, const char *format, ...){

189

va_list ap;

190

va_start (ap, format);

191

192

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

193

program_invocation_short_name));

194

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

195

}

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/*

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198

* Make additional room in "buffer" for at least BUFFER_SIZE more

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199

* bytes. "buffer_capacity" is how much is currently allocated,

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200

* "buffer_length" is how much is already used.

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201

*/

202

__attribute__((nonnull, warn_unused_result))

178

203

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

204

size_t buffer_capacity){

180

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

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

182

if(buffer == NULL){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

183

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return 0;

184

213

}

214

*buffer = new_buf;

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215

buffer_capacity += BUFFER_SIZE;

186

216

}

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217

return buffer_capacity;

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218

}

189

219

190

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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/* Add server to set of servers to retry periodically */

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__attribute__((nonnull, warn_unused_result))

222

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

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int af, server **current_server){

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224

int ret;

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225

server *new_server = malloc(sizeof(server));

195

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if(new_server == NULL){

196

227

perror_plus("malloc");

197

return -1;

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return false;

198

229

}

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230

*new_server = (server){ .ip = strdup(ip),

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

203

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if(new_server->ip == NULL){

204

235

perror_plus("strdup");

205

return -1;

206

}

207

/* unique case of first server */

208

if (mc.current_server == NULL){

236

return false;

237

}

238

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

/* Special case of first server */

244

if(*current_server == NULL){

209

245

new_server->next = new_server;

210

246

new_server->prev = new_server;

211

mc.current_server = new_server;

212

/* Placing the new server last in the list */

247

*current_server = new_server;

213

248

} else {

214

new_server->next = mc.current_server;

215

new_server->prev = mc.current_server->prev;

249

/* Place the new server last in the list */

250

new_server->next = *current_server;

251

new_server->prev = (*current_server)->prev;

216

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new_server->prev->next = new_server;

217

mc.current_server->prev = new_server;

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}

219

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

220

if(ret == -1){

221

perror_plus("clock_gettime");

222

return -1;

223

}

224

return 0;

253

(*current_server)->prev = new_server;

254

}

255

return true;

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256

}

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/*

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* Initialize GPGME.

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260

*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

232

266

gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

238

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*/

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bool import_key(const char *filename){

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bool import_key(const char * const filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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282

250

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

251

284

if(rc != GPG_ERR_NO_ERROR){

252

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

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gpgme_strsource(rc), gpgme_strerror(rc));

285

fprintf_plus(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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288

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

290

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

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291

if(rc != GPG_ERR_NO_ERROR){

259

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

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gpgme_strsource(rc), gpgme_strerror(rc));

292

fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

261

294

return false;

262

295

}

263

296

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303

}

271

304

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if(debug){

273

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

306

fprintf_plus(stderr, "Initializing GPGME\n");

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}

275

308

276

309

/* Init GPGME */

277

310

gpgme_check_version(NULL);

278

311

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

279

312

if(rc != GPG_ERR_NO_ERROR){

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

313

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

314

gpgme_strsource(rc), gpgme_strerror(rc));

282

315

return false;

283

316

}

284

317

285

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

318

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

286

319

rc = gpgme_get_engine_info(&engine_info);

287

320

if(rc != GPG_ERR_NO_ERROR){

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

321

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

322

gpgme_strsource(rc), gpgme_strerror(rc));

290

323

return false;

291

324

}

292

325

while(engine_info != NULL){

298

331

engine_info = engine_info->next;

299

332

}

300

333

if(engine_info == NULL){

301

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

334

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

335

tempdir);

302

336

return false;

303

337

}

304

338

305

339

/* Create new GPGME "context" */

306

rc = gpgme_new(&(mc.ctx));

340

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

307

341

if(rc != GPG_ERR_NO_ERROR){

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

342

fprintf_plus(stderr, "Mandos plugin mandos-client: "

343

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

344

gpgme_strerror(rc));

310

345

return false;

311

346

}

312

347

321

356

* Decrypt OpenPGP data.

322

357

* Returns -1 on error

323

358

*/

359

__attribute__((nonnull, warn_unused_result))

324

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

325

361

size_t crypto_size,

326

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

327

364

gpgme_data_t dh_crypto, dh_plain;

328

365

gpgme_error_t rc;

329

366

ssize_t ret;

331

368

ssize_t plaintext_length = 0;

332

369

333

370

if(debug){

334

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

371

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

335

372

}

336

373

337

374

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

338

375

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

339

376

0);

340

377

if(rc != GPG_ERR_NO_ERROR){

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

378

fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

379

gpgme_strsource(rc), gpgme_strerror(rc));

343

380

return -1;

344

381

}

345

382

346

383

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

347

384

rc = gpgme_data_new(&dh_plain);

348

385

if(rc != GPG_ERR_NO_ERROR){

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

386

fprintf_plus(stderr, "Mandos plugin mandos-client: "

387

"bad gpgme_data_new: %s: %s\n",

388

gpgme_strsource(rc), gpgme_strerror(rc));

351

389

gpgme_data_release(dh_crypto);

352

390

return -1;

353

391

}

354

392

355

393

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

356

394

data buffer */

357

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

395

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

358

396

if(rc != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

397

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

398

gpgme_strsource(rc), gpgme_strerror(rc));

361

399

plaintext_length = -1;

362

400

if(debug){

363

401

gpgme_decrypt_result_t result;

364

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

365

403

if(result == NULL){

366

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

404

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

367

405

} else {

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

406

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

407

result->unsupported_algorithm);

408

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

409

result->wrong_key_usage);

372

410

if(result->file_name != NULL){

373

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

411

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

374

412

}

375

413

gpgme_recipient_t recipient;

376

414

recipient = result->recipients;

377

415

while(recipient != NULL){

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

416

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

417

gpgme_pubkey_algo_name

418

(recipient->pubkey_algo));

419

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

420

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

421

recipient->status == GPG_ERR_NO_SECKEY

422

? "No" : "Yes");

384

423

recipient = recipient->next;

385

424

}

386

425

}

389

428

}

390

429

391

430

if(debug){

392

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

431

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

393

432

}

394

433

395

434

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

402

441

*plaintext = NULL;

403

442

while(true){

404

443

plaintext_capacity = incbuffer(plaintext,

405

(size_t)plaintext_length,

406

plaintext_capacity);

444

(size_t)plaintext_length,

445

plaintext_capacity);

407

446

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

447

perror_plus("incbuffer");

448

plaintext_length = -1;

449

goto decrypt_end;

411

450

}

412

451

413

452

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

426

465

}

427

466

428

467

if(debug){

429

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

468

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

430

469

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

431

470

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

432

471

}

443

482

return plaintext_length;

444

483

}

445

484

446

static const char * safer_gnutls_strerror(int value){

447

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

448

-Wunreachable-code */

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

449

488

if(ret == NULL)

450

489

ret = "(unknown)";

451

490

return ret;

452

491

}

453

492

454

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

455

495

static void debuggnutls(__attribute__((unused)) int level,

456

496

const char* string){

457

fprintf(stderr, "GnuTLS: %s", string);

497

fprintf_plus(stderr, "GnuTLS: %s", string);

458

498

}

459

499

500

__attribute__((nonnull, warn_unused_result))

460

501

static int init_gnutls_global(const char *pubkeyfilename,

461

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

462

504

int ret;

463

505

464

506

if(debug){

465

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

507

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

466

508

}

467

509

468

510

ret = gnutls_global_init();

469

511

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

512

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

513

safer_gnutls_strerror(ret));

472

514

return -1;

473

515

}

474

516

481

523

}

482

524

483

525

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

527

if(ret != GNUTLS_E_SUCCESS){

486

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

487

safer_gnutls_strerror(ret));

528

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

529

safer_gnutls_strerror(ret));

488

530

gnutls_global_deinit();

489

531

return -1;

490

532

}

491

533

492

534

if(debug){

493

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

494

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

495

seckeyfilename);

535

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

536

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

537

pubkeyfilename,

538

seckeyfilename);

496

539

}

497

540

498

541

ret = gnutls_certificate_set_openpgp_key_file

499

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

500

543

GNUTLS_OPENPGP_FMT_BASE64);

501

544

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

545

fprintf_plus(stderr,

546

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

547

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

548

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

549

safer_gnutls_strerror(ret));

507

550

goto globalfail;

508

551

}

509

552

510

553

/* GnuTLS server initialization */

511

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

512

555

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

557

" initialization: %s\n",

558

safer_gnutls_strerror(ret));

515

559

goto globalfail;

516

560

}

517

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

561

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

518

562

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

563

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

564

safer_gnutls_strerror(ret));

521

565

goto globalfail;

522

566

}

523

567

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

525

569

526

570

return 0;

527

571

528

572

globalfail:

529

573

530

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

531

575

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

533

577

return -1;

534

578

}

535

579

536

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

537

583

int ret;

538

584

/* GnuTLS session creation */

539

585

do {

543

589

}

544

590

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

545

591

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

592

fprintf_plus(stderr,

593

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

594

safer_gnutls_strerror(ret));

548

595

}

549

596

550

597

{

551

598

const char *err;

552

599

do {

553

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

600

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

554

601

if(quit_now){

555

602

gnutls_deinit(*session);

556

603

return -1;

557

604

}

558

605

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

559

606

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

607

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

608

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

609

safer_gnutls_strerror(ret));

563

610

gnutls_deinit(*session);

564

611

return -1;

565

612

}

567

614

568

615

do {

569

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

617

mc->cred);

571

618

if(quit_now){

572

619

gnutls_deinit(*session);

573

620

return -1;

574

621

}

575

622

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

576

623

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

624

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

625

safer_gnutls_strerror(ret));

579

626

gnutls_deinit(*session);

580

627

return -1;

581

628

}

583

630

/* ignore client certificate if any. */

584

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

585

632

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

634

588

635

return 0;

589

636

}

593

640

__attribute__((unused)) const char *txt){}

594

641

595

642

/* Called when a Mandos server is found */

596

static int start_mandos_communication(const char *ip, uint16_t port,

643

__attribute__((nonnull, warn_unused_result))

644

static int start_mandos_communication(const char *ip, in_port_t port,

597

645

AvahiIfIndex if_index,

598

int af){

646

int af, mandos_context *mc){

599

647

int ret, tcp_sd = -1;

600

648

ssize_t sret;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

649

struct sockaddr_storage to;

605

650

char *buffer = NULL;

606

651

char *decrypted_buffer = NULL;

607

652

size_t buffer_length = 0;

626

671

pf = PF_INET;

627

672

break;

628

673

default:

629

fprintf(stderr, "Bad address family: %d\n", af);

674

fprintf_plus(stderr, "Bad address family: %d\n", af);

630

675

errno = EINVAL;

631

676

return -1;

632

677

}

633

678

634

ret = init_gnutls_session(&session);

679

/* If the interface is specified and we have a list of interfaces */

680

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

681

/* Check if the interface is one of the interfaces we are using */

682

bool match = false;

683

{

684

char *interface = NULL;

685

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

686

interface))){

687

if(if_nametoindex(interface) == (unsigned int)if_index){

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

/* This interface does not match any in the list, so we don't

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

fprintf_plus(stderr, "Skipping server on non-used interface"

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

635

712

if(ret != 0){

636

713

return -1;

637

714

}

638

715

639

716

if(debug){

640

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

641

"\n", ip, port);

717

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

718

PRIuMAX "\n", ip, (uintmax_t)port);

642

719

}

643

720

644

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

656

733

657

734

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

658

735

if(af == AF_INET6){

659

to.in6.sin6_family = (sa_family_t)af;

660

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

736

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

737

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

661

738

} else { /* IPv4 */

662

to.in.sin_family = (sa_family_t)af;

663

ret = inet_pton(af, ip, &to.in.sin_addr);

739

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

740

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

664

741

}

665

742

if(ret < 0 ){

666

743

int e = errno;

670

747

}

671

748

if(ret == 0){

672

749

int e = errno;

673

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

750

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

674

751

errno = e;

675

752

goto mandos_end;

676

753

}

677

754

if(af == AF_INET6){

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

684

-Wunreachable-code*/

755

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

756

if(IN6_IS_ADDR_LINKLOCAL

757

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

685

758

if(if_index == AVAHI_IF_UNSPEC){

686

fprintf(stderr, "An IPv6 link-local address is incomplete"

687

" without a network interface\n");

759

fprintf_plus(stderr, "An IPv6 link-local address is"

760

" incomplete without a network interface\n");

688

761

errno = EINVAL;

689

762

goto mandos_end;

690

763

}

691

764

/* Set the network interface number as scope */

692

to.in6.sin6_scope_id = (uint32_t)if_index;

765

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

693

766

}

694

767

} else {

695

to.in.sin_port = htons(port); /* Spurious warnings from

696

-Wconversion and

697

-Wunreachable-code */

768

((struct sockaddr_in *)&to)->sin_port = htons(port);

698

769

}

699

770

700

771

if(quit_now){

708

779

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

709

780

perror_plus("if_indextoname");

710

781

} else {

711

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

712

ip, interface, port);

782

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

783

"\n", ip, interface, (uintmax_t)port);

713

784

}

714

785

} else {

715

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

716

port);

786

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

787

ip, (uintmax_t)port);

717

788

}

718

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

720

const char *pcret;

721

791

if(af == AF_INET6){

722

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

723

sizeof(addrstr));

792

ret = getnameinfo((struct sockaddr *)&to,

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

724

796

} else {

725

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

726

sizeof(addrstr));

797

ret = getnameinfo((struct sockaddr *)&to,

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

727

801

}

728

if(pcret == NULL){

729

perror_plus("inet_ntop");

730

} else {

731

if(strcmp(addrstr, ip) != 0){

732

fprintf(stderr, "Canonical address form: %s\n", addrstr);

733

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

806

} else if(strcmp(addrstr, ip) != 0){

807

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

734

808

}

735

809

}

736

810

740

814

}

741

815

742

816

if(af == AF_INET6){

743

ret = connect(tcp_sd, &to.in6, sizeof(to));

817

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

818

sizeof(struct sockaddr_in6));

744

819

} else {

745

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

820

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

821

sizeof(struct sockaddr_in));

746

822

}

747

823

if(ret < 0){

748

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

824

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

749

825

int e = errno;

750

826

perror_plus("connect");

751

827

errno = e;

763

839

while(true){

764

840

size_t out_size = strlen(out);

765

841

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

766

out_size - written));

842

out_size - written));

767

843

if(ret == -1){

768

844

int e = errno;

769

845

perror_plus("write");

789

865

}

790

866

791

867

if(debug){

792

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

868

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

793

869

}

794

870

795

871

if(quit_now){

797

873

goto mandos_end;

798

874

}

799

875

800

/* Spurious warning from -Wint-to-pointer-cast */

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

876

/* This casting via intptr_t is to eliminate warning about casting

877

an int to a pointer type. This is exactly how the GnuTLS Guile

878

function "set-session-transport-fd!" does it. */

879

gnutls_transport_set_ptr(session,

880

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

881

803

882

if(quit_now){

804

883

errno = EINTR;

815

894

816

895

if(ret != GNUTLS_E_SUCCESS){

817

896

if(debug){

818

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

897

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

819

898

gnutls_perror(ret);

820

899

}

821

900

errno = EPROTO;

825

904

/* Read OpenPGP packet that contains the wanted password */

826

905

827

906

if(debug){

828

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

829

ip);

907

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

908

" %s\n", ip);

830

909

}

831

910

832

911

while(true){

837

916

}

838

917

839

918

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

919

buffer_capacity);

841

920

if(buffer_capacity == 0){

842

921

int e = errno;

843

922

perror_plus("incbuffer");

870

949

}

871

950

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

872

951

if(ret < 0){

873

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

952

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

953

"***\n");

874

954

gnutls_perror(ret);

875

955

errno = EPROTO;

876

956

goto mandos_end;

877

957

}

878

958

break;

879

959

default:

880

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

881

" encrypted session with Mandos server\n");

960

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

961

" encrypted session with Mandos server\n");

882

962

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

963

errno = EIO;

884

964

goto mandos_end;

889

969

}

890

970

891

971

if(debug){

892

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

972

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

893

973

}

894

974

895

975

if(quit_now){

907

987

908

988

if(buffer_length > 0){

909

989

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

991

&decrypted_buffer, mc);

913

992

if(decrypted_buffer_size >= 0){

914

993

915

994

written = 0;

925

1004

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

926

1005

int e = errno;

927

1006

if(debug){

928

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

929

strerror(errno));

1007

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

1008

strerror(errno));

930

1009

}

931

1010

errno = e;

932

1011

goto mandos_end;

963

1042

return retval;

964

1043

}

965

1044

1045

__attribute__((nonnull))

966

1046

static void resolve_callback(AvahiSServiceResolver *r,

967

1047

AvahiIfIndex interface,

968

1048

AvahiProtocol proto,

976

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

977

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

978

1058

flags,

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

981

1063

982

1064

/* Called whenever a service has been resolved successfully or

983

1065

timed out */

989

1071

switch(event){

990

1072

default:

991

1073

case AVAHI_RESOLVER_FAILURE:

992

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

993

" of type '%s' in domain '%s': %s\n", name, type, domain,

994

avahi_strerror(avahi_server_errno(mc.server)));

1074

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1075

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1076

domain,

1077

avahi_strerror(avahi_server_errno

1078

(((mandos_context*)mc)->server)));

995

1079

break;

996

1080

997

1081

case AVAHI_RESOLVER_FOUND:

999

1083

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1084

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

1001

1085

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1086

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

1087

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

1088

host_name, ip, (intmax_t)interface, port);

1005

1089

}

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1090

int ret = start_mandos_communication(ip, (in_port_t)port,

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1008

1094

if(ret == 0){

1009

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1010

1096

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1097

if(not add_server(ip, (in_port_t)port, interface,

1098

avahi_proto_to_af(proto),

1099

&((mandos_context*)mc)->current_server)){

1100

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1101

" list\n", name);

1102

}

1013

1103

}

1014

1104

}

1015

1105

}

1025

1115

const char *domain,

1026

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1027

1117

flags,

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1030

1122

1031

1123

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

1032

1124

is removed from the LAN */

1039

1131

default:

1040

1132

case AVAHI_BROWSER_FAILURE:

1041

1133

1042

fprintf(stderr, "(Avahi browser) %s\n",

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1134

fprintf_plus(stderr, "(Avahi browser) %s\n",

1135

avahi_strerror(avahi_server_errno

1136

(((mandos_context*)mc)->server)));

1137

avahi_simple_poll_quit(simple_poll);

1045

1138

return;

1046

1139

1047

1140

case AVAHI_BROWSER_NEW:

1050

1143

the callback function is called the Avahi server will free the

1051

1144

resolver for us. */

1052

1145

1053

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

1057

name, avahi_strerror(avahi_server_errno(mc.server)));

1146

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1150

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1151

" %s\n", name,

1152

avahi_strerror(avahi_server_errno

1153

(((mandos_context*)mc)->server)));

1058

1154

break;

1059

1155

1060

1156

case AVAHI_BROWSER_REMOVE:

1063

1159

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1160

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1161

if(debug){

1066

fprintf(stderr, "No Mandos server found, still searching...\n");

1162

fprintf_plus(stderr, "No Mandos server found, still"

1163

" searching...\n");

1067

1164

}

1068

1165

break;

1069

1166

}

1078

1175

signal_received = sig;

1079

1176

int old_errno = errno;

1080

1177

/* set main loop to exit */

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1083

1180

}

1084

1181

errno = old_errno;

1085

1182

}

1086

1183

1184

__attribute__((nonnull, warn_unused_result))

1185

bool get_flags(const char *ifname, struct ifreq *ifr){

1186

int ret;

1187

error_t ret_errno;

1188

1189

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1190

if(s < 0){

1191

ret_errno = errno;

1192

perror_plus("socket");

1193

errno = ret_errno;

1194

return false;

1195

}

1196

strcpy(ifr->ifr_name, ifname);

1197

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1198

if(ret == -1){

1199

if(debug){

1200

ret_errno = errno;

1201

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1203

}

1204

return false;

1205

}

1206

return true;

1207

}

1208

1209

__attribute__((nonnull, warn_unused_result))

1210

bool good_flags(const char *ifname, const struct ifreq *ifr){

1211

1212

/* Reject the loopback device */

1213

if(ifr->ifr_flags & IFF_LOOPBACK){

1214

if(debug){

1215

fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",

1216

ifname);

1217

}

1218

return false;

1219

}

1220

/* Accept point-to-point devices only if connect_to is specified */

1221

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1222

if(debug){

1223

fprintf_plus(stderr, "Accepting point-to-point interface"

1224

" \"%s\"\n", ifname);

1225

}

1226

return true;

1227

}

1228

/* Otherwise, reject non-broadcast-capable devices */

1229

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1230

if(debug){

1231

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1232

" \"%s\"\n", ifname);

1233

}

1234

return false;

1235

}

1236

/* Reject non-ARP interfaces (including dummy interfaces) */

1237

if(ifr->ifr_flags & IFF_NOARP){

1238

if(debug){

1239

fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",

1240

ifname);

1241

}

1242

return false;

1243

}

1244

1245

/* Accept this device */

1246

if(debug){

1247

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1248

}

1249

return true;

1250

}

1251

1087

1252

/*

1088

1253

* This function determines if a directory entry in /sys/class/net

1089

1254

* corresponds to an acceptable network device.

1090

1255

* (This function is passed to scandir(3) as a filter function.)

1091

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1092

1258

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

1259

if(if_entry->d_name[0] == '.'){

1096

1260

return 0;

1097

1261

}

1098

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1112

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1114

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1115

flagstring[(size_t)to_read] = '\0';

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

tmpmax = strtoimax(flagstring, &tmp, 0);

1140

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

/* Accept point-to-point devices only if connect_to is specified */

1161

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1162

if(debug){

1163

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

/* Otherwise, reject non-broadcast-capable devices */

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

/* Reject non-ARP interfaces (including dummy interfaces) */

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1187

if_entry->d_name);

1262

1263

struct ifreq ifr;

1264

if(not get_flags(if_entry->d_name, &ifr)){

1265

if(debug){

1266

fprintf_plus(stderr, "Failed to get flags for interface "

1267

"\"%s\"\n", if_entry->d_name);

1268

}

1269

return 0;

1270

}

1271

1272

if(not good_flags(if_entry->d_name, &ifr)){

1273

return 0;

1188

1274

}

1189

1275

return 1;

1190

1276

}

1191

1277

1278

/*

1279

* This function determines if a network interface is up.

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

bool interface_is_up(const char *interface){

1283

struct ifreq ifr;

1284

if(not get_flags(interface, &ifr)){

1285

if(debug){

1286

fprintf_plus(stderr, "Failed to get flags for interface "

1287

"\"%s\"\n", interface);

1288

}

1289

return false;

1290

}

1291

1292

return (bool)(ifr.ifr_flags & IFF_UP);

1293

}

1294

1295

/*

1296

* This function determines if a network interface is running

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

bool interface_is_running(const char *interface){

1300

struct ifreq ifr;

1301

if(not get_flags(interface, &ifr)){

1302

if(debug){

1303

fprintf_plus(stderr, "Failed to get flags for interface "

1304

"\"%s\"\n", interface);

1305

}

1306

return false;

1307

}

1308

1309

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1310

}

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1192

1313

int notdotentries(const struct dirent *direntry){

1193

1314

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

1194

1315

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

1200

1321

return 1;

1201

1322

}

1202

1323

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1324

/* Is this directory entry a runnable program? */

1325

__attribute__((nonnull, warn_unused_result))

1326

int runnable_hook(const struct dirent *direntry){

1327

int ret;

1328

size_t sret;

1329

struct stat st;

1330

1331

if((direntry->d_name)[0] == '\0'){

1332

/* Empty name? */

1333

return 0;

1334

}

1335

1336

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1337

"abcdefghijklmnopqrstuvwxyz"

1338

"0123456789"

1339

"_.-");

1340

if((direntry->d_name)[sret] != '\0'){

1341

/* Contains non-allowed characters */

1342

if(debug){

1343

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1344

direntry->d_name);

1345

}

1346

return 0;

1347

}

1348

1349

char *fullname = NULL;

1350

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1351

if(ret < 0){

1352

perror_plus("asprintf");

1353

return 0;

1354

}

1355

1356

ret = stat(fullname, &st);

1357

if(ret == -1){

1358

if(debug){

1359

perror_plus("Could not stat hook");

1360

}

1361

return 0;

1362

}

1363

free(fullname);

1364

if(not (S_ISREG(st.st_mode))){

1365

/* Not a regular file */

1366

if(debug){

1367

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1368

direntry->d_name);

1369

}

1370

return 0;

1371

}

1372

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1373

/* Not executable */

1374

if(debug){

1375

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1376

direntry->d_name);

1377

}

1378

return 0;

1379

}

1380

if(debug){

1381

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1382

direntry->d_name);

1383

}

1384

return 1;

1385

}

1386

1387

__attribute__((nonnull, warn_unused_result))

1388

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

mandos_context *mc){

1204

1390

int ret;

1205

1391

struct timespec now;

1206

1392

struct timespec waited_time;

1207

1393

intmax_t block_time;

1208

1394

1209

1395

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1396

if(mc->current_server == NULL){

1397

if(debug){

1398

fprintf_plus(stderr, "Wait until first server is found."

1399

" No timeout!\n");

1214

1400

}

1215

1401

ret = avahi_simple_poll_iterate(s, -1);

1216

1402

} else {

1217

if (debug){

1218

fprintf(stderr, "Check current_server if we should run it,"

1219

" or wait\n");

1403

if(debug){

1404

fprintf_plus(stderr, "Check current_server if we should run"

1405

" it, or wait\n");

1220

1406

}

1221

1407

/* the current time */

1222

1408

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1227

1413

/* Calculating in ms how long time between now and server

1228

1414

who we visted longest time ago. Now - last seen. */

1229

1415

waited_time.tv_sec = (now.tv_sec

1230

- mc.current_server->last_seen.tv_sec);

1416

- mc->current_server->last_seen.tv_sec);

1231

1417

waited_time.tv_nsec = (now.tv_nsec

1232

- mc.current_server->last_seen.tv_nsec);

1418

- mc->current_server->last_seen.tv_nsec);

1233

1419

/* total time is 10s/10,000ms.

1234

1420

Converting to s from ms by dividing by 1,000,

1235

1421

and ns to ms by dividing by 1,000,000. */

1236

1422

block_time = ((retry_interval

1237

1423

- ((intmax_t)waited_time.tv_sec * 1000))

1238

1424

- ((intmax_t)waited_time.tv_nsec / 1000000));

1239

1240

if (debug){

1241

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1425

1426

if(debug){

1427

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1428

block_time);

1242

1429

}

1243

1430

1244

1431

if(block_time <= 0){

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1432

ret = start_mandos_communication(mc->current_server->ip,

1433

mc->current_server->port,

1434

mc->current_server->if_index,

1435

mc->current_server->af, mc);

1249

1436

if(ret == 0){

1250

avahi_simple_poll_quit(mc.simple_poll);

1437

avahi_simple_poll_quit(s);

1251

1438

return 0;

1252

1439

}

1253

1440

ret = clock_gettime(CLOCK_MONOTONIC,

1254

&mc.current_server->last_seen);

1441

&mc->current_server->last_seen);

1255

1442

if(ret == -1){

1256

1443

perror_plus("clock_gettime");

1257

1444

return -1;

1258

1445

}

1259

mc.current_server = mc.current_server->next;

1446

mc->current_server = mc->current_server->next;

1260

1447

block_time = 0; /* Call avahi to find new Mandos

1261

1448

servers, but don't block */

1262

1449

}

1264

1451

ret = avahi_simple_poll_iterate(s, (int)block_time);

1265

1452

}

1266

1453

if(ret != 0){

1267

if (ret > 0 or errno != EINTR) {

1454

if(ret > 0 or errno != EINTR){

1268

1455

return (ret != 1) ? ret : 0;

1269

1456

}

1270

1457

}

1271

1458

}

1272

1459

}

1273

1460

1461

/* Set effective uid to 0, return errno */

1462

__attribute__((warn_unused_result))

1463

error_t raise_privileges(void){

1464

error_t old_errno = errno;

1465

error_t ret_errno = 0;

1466

if(seteuid(0) == -1){

1467

ret_errno = errno;

1468

perror_plus("seteuid");

1469

}

1470

errno = old_errno;

1471

return ret_errno;

1472

}

1473

1474

/* Set effective and real user ID to 0. Return errno. */

1475

__attribute__((warn_unused_result))

1476

error_t raise_privileges_permanently(void){

1477

error_t old_errno = errno;

1478

error_t ret_errno = raise_privileges();

1479

if(ret_errno != 0){

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

if(setuid(0) == -1){

1484

ret_errno = errno;

1485

perror_plus("seteuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

/* Set effective user ID to unprivileged saved user ID */

1492

__attribute__((warn_unused_result))

1493

error_t lower_privileges(void){

1494

error_t old_errno = errno;

1495

error_t ret_errno = 0;

1496

if(seteuid(uid) == -1){

1497

ret_errno = errno;

1498

perror_plus("seteuid");

1499

}

1500

errno = old_errno;

1501

return ret_errno;

1502

}

1503

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

error_t lower_privileges_permanently(void){

1507

error_t old_errno = errno;

1508

error_t ret_errno = 0;

1509

if(setuid(uid) == -1){

1510

ret_errno = errno;

1511

perror_plus("setuid");

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

#ifndef O_CLOEXEC

1518

/*

1519

* Based on the example in the GNU LibC manual chapter 13.13 "File

1520

* Descriptor Flags".

1521

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1526

/* If reading the flags failed, return error indication now. */

1527

if(ret < 0){

1528

return ret;

1529

}

1530

/* Store modified flag word in the descriptor. */

1531

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

__attribute__((nonnull))

1537

void run_network_hooks(const char *mode, const char *interface,

1538

const float delay){

1539

struct dirent **direntries;

1540

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1548

if(hookdir_fd == -1){

1549

if(errno == ENOENT){

1550

if(debug){

1551

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1552

" found\n", hookdir);

1553

}

1554

} else {

1555

perror_plus("open");

1556

}

1557

return;

1558

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1574

runnable_hook, alphasort);

1575

#else /* not __GLIBC_PREREQ(2, 15) */

1576

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1577

alphasort);

1578

#endif /* not __GLIBC_PREREQ(2, 15) */

1579

#else /* not __GLIBC__ */

1580

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1583

if(numhooks == -1){

1584

perror_plus("scandir");

1585

return;

1586

}

1587

struct dirent *direntry;

1588

int ret;

1589

int devnull = open("/dev/null", O_RDONLY);

1590

for(int i = 0; i < numhooks; i++){

1591

direntry = direntries[i];

1592

if(debug){

1593

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1594

direntry->d_name);

1595

}

1596

pid_t hook_pid = fork();

1597

if(hook_pid == 0){

1598

/* Child */

1599

/* Raise privileges */

1600

if(raise_privileges_permanently() != 0){

1601

perror_plus("Failed to raise privileges");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Set group */

1605

errno = 0;

1606

ret = setgid(0);

1607

if(ret == -1){

1608

perror_plus("setgid");

1609

_exit(EX_NOPERM);

1610

}

1611

/* Reset supplementary groups */

1612

errno = 0;

1613

ret = setgroups(0, NULL);

1614

if(ret == -1){

1615

perror_plus("setgroups");

1616

_exit(EX_NOPERM);

1617

}

1618

ret = dup2(devnull, STDIN_FILENO);

1619

if(ret == -1){

1620

perror_plus("dup2(devnull, STDIN_FILENO)");

1621

_exit(EX_OSERR);

1622

}

1623

ret = close(devnull);

1624

if(ret == -1){

1625

perror_plus("close");

1626

_exit(EX_OSERR);

1627

}

1628

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1629

if(ret == -1){

1630

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1631

_exit(EX_OSERR);

1632

}

1633

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1634

if(ret == -1){

1635

perror_plus("setenv");

1636

_exit(EX_OSERR);

1637

}

1638

ret = setenv("DEVICE", interface, 1);

1639

if(ret == -1){

1640

perror_plus("setenv");

1641

_exit(EX_OSERR);

1642

}

1643

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1644

if(ret == -1){

1645

perror_plus("setenv");

1646

_exit(EX_OSERR);

1647

}

1648

ret = setenv("MODE", mode, 1);

1649

if(ret == -1){

1650

perror_plus("setenv");

1651

_exit(EX_OSERR);

1652

}

1653

char *delaystring;

1654

ret = asprintf(&delaystring, "%f", (double)delay);

1655

if(ret == -1){

1656

perror_plus("asprintf");

1657

_exit(EX_OSERR);

1658

}

1659

ret = setenv("DELAY", delaystring, 1);

1660

if(ret == -1){

1661

free(delaystring);

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

free(delaystring);

1666

if(connect_to != NULL){

1667

ret = setenv("CONNECT", connect_to, 1);

1668

if(ret == -1){

1669

perror_plus("setenv");

1670

_exit(EX_OSERR);

1671

}

1672

}

1673

if(fexecve(hookdir_fd, (char *const [])

1674

{ direntry->d_name, NULL }, environ) == -1){

1675

perror_plus("fexecve");

1676

_exit(EXIT_FAILURE);

1677

}

1678

} else {

1679

int status;

1680

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1681

perror_plus("waitpid");

1682

continue;

1683

}

1684

if(WIFEXITED(status)){

1685

if(WEXITSTATUS(status) != 0){

1686

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1687

" with status %d\n", direntry->d_name,

1688

WEXITSTATUS(status));

1689

continue;

1690

}

1691

} else if(WIFSIGNALED(status)){

1692

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1693

" signal %d\n", direntry->d_name,

1694

WTERMSIG(status));

1695

continue;

1696

} else {

1697

fprintf_plus(stderr, "Warning: network hook \"%s\""

1698

" crashed\n", direntry->d_name);

1699

continue;

1700

}

1701

}

1702

if(debug){

1703

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1704

direntry->d_name);

1705

}

1706

}

1707

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1708

perror_plus("close");

1709

} else {

1710

hookdir_fd = -1;

1711

}

1712

close(devnull);

1713

}

1714

1715

__attribute__((nonnull, warn_unused_result))

1716

error_t bring_up_interface(const char *const interface,

1717

const float delay){

1718

error_t old_errno = errno;

1719

int ret;

1720

struct ifreq network;

1721

unsigned int if_index = if_nametoindex(interface);

1722

if(if_index == 0){

1723

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

1724

errno = old_errno;

1725

return ENXIO;

1726

}

1727

1728

if(quit_now){

1729

errno = old_errno;

1730

return EINTR;

1731

}

1732

1733

if(not interface_is_up(interface)){

1734

error_t ret_errno = 0, ioctl_errno = 0;

1735

if(not get_flags(interface, &network)){

1736

ret_errno = errno;

1737

fprintf_plus(stderr, "Failed to get flags for interface "

1738

"\"%s\"\n", interface);

1739

errno = old_errno;

1740

return ret_errno;

1741

}

1742

network.ifr_flags |= IFF_UP; /* set flag */

1743

1744

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1745

if(sd == -1){

1746

ret_errno = errno;

1747

perror_plus("socket");

1748

errno = old_errno;

1749

return ret_errno;

1750

}

1751

1752

if(quit_now){

1753

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

1754

if(ret == -1){

1755

perror_plus("close");

1756

}

1757

errno = old_errno;

1758

return EINTR;

1759

}

1760

1761

if(debug){

1762

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1763

interface);

1764

}

1765

1766

/* Raise privileges */

1767

ret_errno = raise_privileges();

1768

if(ret_errno != 0){

1769

perror_plus("Failed to raise privileges");

1770

}

1771

1772

#ifdef __linux__

1773

int ret_linux;

1774

bool restore_loglevel = false;

1775

if(ret_errno == 0){

1776

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1777

messages about the network interface to mess up the prompt */

1778

ret_linux = klogctl(8, NULL, 5);

1779

if(ret_linux == -1){

1780

perror_plus("klogctl");

1781

} else {

1782

restore_loglevel = true;

1783

}

1784

}

1785

#endif /* __linux__ */

1786

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1787

ioctl_errno = errno;

1788

#ifdef __linux__

1789

if(restore_loglevel){

1790

ret_linux = klogctl(7, NULL, 0);

1791

if(ret_linux == -1){

1792

perror_plus("klogctl");

1793

}

1794

}

1795

#endif /* __linux__ */

1796

1797

/* If raise_privileges() succeeded above */

1798

if(ret_errno == 0){

1799

/* Lower privileges */

1800

ret_errno = lower_privileges();

1801

if(ret_errno != 0){

1802

errno = ret_errno;

1803

perror_plus("Failed to lower privileges");

1804

}

1805

}

1806

1807

/* Close the socket */

1808

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

1809

if(ret == -1){

1810

perror_plus("close");

1811

}

1812

1813

if(ret_setflags == -1){

1814

errno = ioctl_errno;

1815

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1816

errno = old_errno;

1817

return ioctl_errno;

1818

}

1819

} else if(debug){

1820

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1821

interface);

1822

}

1823

1824

/* Sleep checking until interface is running.

1825

Check every 0.25s, up to total time of delay */

1826

for(int i=0; i < delay * 4; i++){

1827

if(interface_is_running(interface)){

1828

break;

1829

}

1830

struct timespec sleeptime = { .tv_nsec = 250000000 };

1831

ret = nanosleep(&sleeptime, NULL);

1832

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

1833

perror_plus("nanosleep");

1834

}

1835

}

1836

1837

errno = old_errno;

1838

return 0;

1839

}

1840

1841

__attribute__((nonnull, warn_unused_result))

1842

error_t take_down_interface(const char *const interface){

1843

error_t old_errno = errno;

1844

struct ifreq network;

1845

unsigned int if_index = if_nametoindex(interface);

1846

if(if_index == 0){

1847

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

1848

errno = old_errno;

1849

return ENXIO;

1850

}

1851

if(interface_is_up(interface)){

1852

error_t ret_errno = 0, ioctl_errno = 0;

1853

if(not get_flags(interface, &network) and debug){

1854

ret_errno = errno;

1855

fprintf_plus(stderr, "Failed to get flags for interface "

1856

"\"%s\"\n", interface);

1857

errno = old_errno;

1858

return ret_errno;

1859

}

1860

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1861

1862

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1863

if(sd == -1){

1864

ret_errno = errno;

1865

perror_plus("socket");

1866

errno = old_errno;

1867

return ret_errno;

1868

}

1869

1870

if(debug){

1871

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

1872

interface);

1873

}

1874

1875

/* Raise privileges */

1876

ret_errno = raise_privileges();

1877

if(ret_errno != 0){

1878

perror_plus("Failed to raise privileges");

1879

}

1880

1881

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1882

ioctl_errno = errno;

1883

1884

/* If raise_privileges() succeeded above */

1885

if(ret_errno == 0){

1886

/* Lower privileges */

1887

ret_errno = lower_privileges();

1888

if(ret_errno != 0){

1889

errno = ret_errno;

1890

perror_plus("Failed to lower privileges");

1891

}

1892

}

1893

1894

/* Close the socket */

1895

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

1896

if(ret == -1){

1897

perror_plus("close");

1898

}

1899

1900

if(ret_setflags == -1){

1901

errno = ioctl_errno;

1902

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1903

errno = old_errno;

1904

return ioctl_errno;

1905

}

1906

} else if(debug){

1907

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1908

interface);

1909

}

1910

1911

errno = old_errno;

1912

return 0;

1913

}

1914

1274

1915

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

1916

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1917

.priority = "SECURE256:!CTYPE-X.509:"

1918

"+CTYPE-OPENPGP", .current_server = NULL,

1919

.interfaces = NULL, .interfaces_size = 0 };

1275

1920

AvahiSServiceBrowser *sb = NULL;

1276

int error;

1921

error_t ret_errno;

1277

1922

int ret;

1278

1923

intmax_t tmpmax;

1279

1924

char *tmp;

1280

1925

int exitcode = EXIT_SUCCESS;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1287

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

1288

bool tempdir_created = false;

1926

char *interfaces_to_take_down = NULL;

1927

size_t interfaces_to_take_down_size = 0;

1928

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1929

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

1930

char *tempdir = NULL;

1289

1931

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1290

1932

const char *seckey = PATHDIR "/" SECKEY;

1291

1933

const char *pubkey = PATHDIR "/" PUBKEY;

1934

char *interfaces_hooks = NULL;

1292

1935

1293

1936

bool gnutls_initialized = false;

1294

1937

bool gpgme_initialized = false;

1356

1999

.group = 2 },

1357

2000

{ .name = "retry", .key = 132,

1358

2001

.arg = "SECONDS",

1359

.doc = "Retry interval used when denied by the mandos server",

2002

.doc = "Retry interval used when denied by the Mandos server",

2003

.group = 2 },

2004

{ .name = "network-hook-dir", .key = 133,

2005

.arg = "DIR",

2006

.doc = "Directory where network hooks are located",

1360

2007

.group = 2 },

1361

2008

/*

1362

2009

* These reproduce what we would get without ARGP_NO_HELP

1381

2028

connect_to = arg;

1382

2029

break;

1383

2030

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

1384

interface = arg;

2031

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2032

arg, (int)',');

2033

if(ret_errno != 0){

2034

argp_error(state, "%s", strerror(ret_errno));

2035

}

1385

2036

break;

1386

2037

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

1387

2038

seckey = arg;

1411

2062

errno = 0;

1412

2063

retry_interval = strtod(arg, &tmp);

1413

2064

if(errno != 0 or tmp == arg or *tmp != '\0'

1414

or (retry_interval * 1000) > INT_MAX){

2065

or (retry_interval * 1000) > INT_MAX

2066

or retry_interval < 0){

1415

2067

argp_error(state, "Bad retry interval");

1416

2068

}

1417

2069

break;

2070

case 133: /* --network-hook-dir */

2071

hookdir = arg;

2072

break;

1418

2073

/*

1419

2074

* These reproduce what we would get without ARGP_NO_HELP

1420

2075

*/

1426

2081

argp_state_help(state, state->out_stream,

1427

2082

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

2083

case 'V': /* --version */

1429

fprintf(state->out_stream, "%s\n", argp_program_version);

2084

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1430

2085

exit(argp_err_exit_status);

1431

2086

break;

1432

2087

default:

1455

2110

goto end;

1456

2111

}

1457

2112

}

2113

2114

{

2115

/* Work around Debian bug #633582:

2116

<http://bugs.debian.org/633582> */

2117

2118

/* Re-raise privileges */

2119

ret_errno = raise_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to raise privileges");

2123

} else {

2124

struct stat st;

2125

2126

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2127

int seckey_fd = open(seckey, O_RDONLY);

2128

if(seckey_fd == -1){

2129

perror_plus("open");

2130

} else {

2131

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

2132

if(ret == -1){

2133

perror_plus("fstat");

2134

} else {

2135

if(S_ISREG(st.st_mode)

2136

and st.st_uid == 0 and st.st_gid == 0){

2137

ret = fchown(seckey_fd, uid, gid);

2138

if(ret == -1){

2139

perror_plus("fchown");

2140

}

2141

}

2142

}

2143

TEMP_FAILURE_RETRY(close(seckey_fd));

2144

}

2145

}

2146

2147

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2148

int pubkey_fd = open(pubkey, O_RDONLY);

2149

if(pubkey_fd == -1){

2150

perror_plus("open");

2151

} else {

2152

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

2153

if(ret == -1){

2154

perror_plus("fstat");

2155

} else {

2156

if(S_ISREG(st.st_mode)

2157

and st.st_uid == 0 and st.st_gid == 0){

2158

ret = fchown(pubkey_fd, uid, gid);

2159

if(ret == -1){

2160

perror_plus("fchown");

2161

}

2162

}

2163

}

2164

TEMP_FAILURE_RETRY(close(pubkey_fd));

2165

}

2166

}

2167

2168

/* Lower privileges */

2169

ret_errno = lower_privileges();

2170

if(ret_errno != 0){

2171

errno = ret_errno;

2172

perror_plus("Failed to lower privileges");

2173

}

2174

}

2175

}

2176

2177

/* Remove invalid interface names (except "none") */

2178

{

2179

char *interface = NULL;

2180

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2181

interface))){

2182

if(strcmp(interface, "none") != 0

2183

and if_nametoindex(interface) == 0){

2184

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

2185

fprintf_plus(stderr, "Not using nonexisting interface"

2186

" \"%s\"\n", interface);

2187

}

2188

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2189

interface = NULL;

2190

}

2191

}

2192

}

2193

2194

/* Run network hooks */

2195

{

2196

if(mc.interfaces != NULL){

2197

interfaces_hooks = malloc(mc.interfaces_size);

2198

if(interfaces_hooks == NULL){

2199

perror_plus("malloc");

2200

goto end;

2201

}

2202

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2203

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2204

}

2205

run_network_hooks("start", interfaces_hooks != NULL ?

2206

interfaces_hooks : "", delay);

2207

}

1458

2208

1459

2209

if(not debug){

1460

2210

avahi_set_log_function(empty_log);

1461

2211

}

1462

1463

if(interface[0] == '\0'){

1464

struct dirent **direntries;

1465

ret = scandir(sys_class_net, &direntries, good_interface,

1466

alphasort);

1467

if(ret >= 1){

1468

/* Pick the first good interface */

1469

interface = strdup(direntries[0]->d_name);

1470

if(debug){

1471

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

1472

}

1473

if(interface == NULL){

1474

perror_plus("malloc");

1475

free(direntries);

1476

exitcode = EXIT_FAILURE;

1477

goto end;

1478

}

1479

free(direntries);

1480

} else {

1481

free(direntries);

1482

fprintf(stderr, "Could not find a network interface\n");

1483

exitcode = EXIT_FAILURE;

1484

goto end;

1485

}

1486

}

1487

2212

1488

2213

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1489

2214

from the signal handler */

1490

2215

/* Initialize the pseudo-RNG for Avahi */

1491

2216

srand((unsigned int) time(NULL));

1492

mc.simple_poll = avahi_simple_poll_new();

1493

if(mc.simple_poll == NULL){

1494

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

2217

simple_poll = avahi_simple_poll_new();

2218

if(simple_poll == NULL){

2219

fprintf_plus(stderr,

2220

"Avahi: Failed to create simple poll object.\n");

1495

2221

exitcode = EX_UNAVAILABLE;

1496

2222

goto end;

1497

2223

}

1559

2285

}

1560

2286

}

1561

2287

1562

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

1563

if(strcmp(interface, "none") != 0){

1564

if_index = (AvahiIfIndex) if_nametoindex(interface);

1565

if(if_index == 0){

1566

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

1567

exitcode = EX_UNAVAILABLE;

1568

goto end;

1569

}

1570

1571

if(quit_now){

1572

goto end;

1573

}

1574

1575

/* Re-raise priviliges */

1576

errno = 0;

1577

ret = seteuid(0);

1578

if(ret == -1){

1579

perror_plus("seteuid");

1580

}

1581

1582

#ifdef __linux__

1583

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1584

messages about the network interface to mess up the prompt */

1585

ret = klogctl(8, NULL, 5);

1586

bool restore_loglevel = true;

1587

if(ret == -1){

1588

restore_loglevel = false;

1589

perror_plus("klogctl");

1590

}

1591

#endif /* __linux__ */

1592

1593

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1594

if(sd < 0){

1595

perror_plus("socket");

1596

exitcode = EX_OSERR;

1597

#ifdef __linux__

1598

if(restore_loglevel){

1599

ret = klogctl(7, NULL, 0);

1600

if(ret == -1){

1601

perror_plus("klogctl");

1602

}

1603

}

1604

#endif /* __linux__ */

1605

/* Lower privileges */

1606

errno = 0;

1607

ret = seteuid(uid);

1608

if(ret == -1){

1609

perror_plus("seteuid");

1610

}

1611

goto end;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

perror_plus("ioctl SIOCGIFFLAGS");

1617

#ifdef __linux__

1618

if(restore_loglevel){

1619

ret = klogctl(7, NULL, 0);

1620

if(ret == -1){

1621

perror_plus("klogctl");

1622

}

1623

}

1624

#endif /* __linux__ */

1625

exitcode = EX_OSERR;

1626

/* Lower privileges */

1627

errno = 0;

1628

ret = seteuid(uid);

1629

if(ret == -1){

1630

perror_plus("seteuid");

1631

}

1632

goto end;

1633

}

1634

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

1635

network.ifr_flags |= IFF_UP;

1636

take_down_interface = true;

1637

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

1638

if(ret == -1){

1639

take_down_interface = false;

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1641

exitcode = EX_OSERR;

1642

#ifdef __linux__

1643

if(restore_loglevel){

1644

ret = klogctl(7, NULL, 0);

1645

if(ret == -1){

1646

perror_plus("klogctl");

2288

/* If no interfaces were specified, make a list */

2289

if(mc.interfaces == NULL){

2290

struct dirent **direntries;

2291

/* Look for any good interfaces */

2292

ret = scandir(sys_class_net, &direntries, good_interface,

2293

alphasort);

2294

if(ret >= 1){

2295

/* Add all found interfaces to interfaces list */

2296

for(int i = 0; i < ret; ++i){

2297

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2298

direntries[i]->d_name);

2299

if(ret_errno != 0){

2300

errno = ret_errno;

2301

perror_plus("argz_add");

2302

continue;

2303

}

2304

if(debug){

2305

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2306

direntries[i]->d_name);

2307

}

2308

}

2309

free(direntries);

2310

} else {

2311

free(direntries);

2312

fprintf_plus(stderr, "Could not find a network interface\n");

2313

exitcode = EXIT_FAILURE;

2314

goto end;

2315

}

2316

}

2317

2318

/* Bring up interfaces which are down, and remove any "none"s */

2319

{

2320

char *interface = NULL;

2321

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2322

interface))){

2323

/* If interface name is "none", stop bringing up interfaces.

2324

Also remove all instances of "none" from the list */

2325

if(strcmp(interface, "none") == 0){

2326

argz_delete(&mc.interfaces, &mc.interfaces_size,

2327

interface);

2328

interface = NULL;

2329

while((interface = argz_next(mc.interfaces,

2330

mc.interfaces_size, interface))){

2331

if(strcmp(interface, "none") == 0){

2332

argz_delete(&mc.interfaces, &mc.interfaces_size,

2333

interface);

2334

interface = NULL;

1647

2335

}

1648

2336

}

1649

#endif /* __linux__ */

1650

/* Lower privileges */

1651

errno = 0;

1652

ret = seteuid(uid);

1653

if(ret == -1){

1654

perror_plus("seteuid");

1655

}

1656

goto end;

1657

}

1658

}

1659

/* Sleep checking until interface is running.

1660

Check every 0.25s, up to total time of delay */

1661

for(int i=0; i < delay * 4; i++){

1662

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

1663

if(ret == -1){

1664

perror_plus("ioctl SIOCGIFFLAGS");

1665

} else if(network.ifr_flags & IFF_RUNNING){

1666

2337

break;

1667

2338

}

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

ret = nanosleep(&sleeptime, NULL);

1670

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

1671

perror_plus("nanosleep");

1672

}

1673

}

1674

if(not take_down_interface){

1675

/* We won't need the socket anymore */

1676

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

1677

if(ret == -1){

1678

perror_plus("close");

1679

}

1680

}

1681

#ifdef __linux__

1682

if(restore_loglevel){

1683

/* Restores kernel loglevel to default */

1684

ret = klogctl(7, NULL, 0);

1685

if(ret == -1){

1686

perror_plus("klogctl");

1687

}

1688

}

1689

#endif /* __linux__ */

1690

/* Lower privileges */

1691

errno = 0;

1692

if(take_down_interface){

1693

/* Lower privileges */

1694

ret = seteuid(uid);

1695

if(ret == -1){

1696

perror_plus("seteuid");

1697

}

1698

} else {

1699

/* Lower privileges permanently */

1700

ret = setuid(uid);

1701

if(ret == -1){

1702

perror_plus("setuid");

1703

}

1704

}

2339

bool interface_was_up = interface_is_up(interface);

2340

errno = bring_up_interface(interface, delay);

2341

if(not interface_was_up){

2342

if(errno != 0){

2343

perror_plus("Failed to bring up interface");

2344

} else {

2345

errno = argz_add(&interfaces_to_take_down,

2346

&interfaces_to_take_down_size,

2347

interface);

2348

if(errno != 0){

2349

perror_plus("argz_add");

2350

}

2351

}

2352

}

2353

}

2354

if(debug and (interfaces_to_take_down == NULL)){

2355

fprintf_plus(stderr, "No interfaces were brought up\n");

2356

}

2357

}

2358

2359

/* If we only got one interface, explicitly use only that one */

2360

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2361

if(debug){

2362

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2363

mc.interfaces);

2364

}

2365

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1705

2366

}

1706

2367

1707

2368

if(quit_now){

1708

2369

goto end;

1709

2370

}

1710

2371

1711

ret = init_gnutls_global(pubkey, seckey);

2372

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

1712

2373

if(ret == -1){

1713

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

2374

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

1714

2375

exitcode = EX_UNAVAILABLE;

1715

2376

goto end;

1716

2377

} else {

1721

2382

goto end;

1722

2383

}

1723

2384

1724

if(mkdtemp(tempdir) == NULL){

2385

/* Try /run/tmp before /tmp */

2386

tempdir = mkdtemp(run_tempdir);

2387

if(tempdir == NULL and errno == ENOENT){

2388

if(debug){

2389

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2390

run_tempdir, old_tempdir);

2391

}

2392

tempdir = mkdtemp(old_tempdir);

2393

}

2394

if(tempdir == NULL){

1725

2395

perror_plus("mkdtemp");

1726

2396

goto end;

1727

2397

}

1728

tempdir_created = true;

1729

2398

1730

2399

if(quit_now){

1731

2400

goto end;

1732

2401

}

1733

2402

1734

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

1735

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

2403

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

2404

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

1736

2405

exitcode = EX_UNAVAILABLE;

1737

2406

goto end;

1738

2407

} else {

1747

2416

/* Connect directly, do not use Zeroconf */

1748

2417

/* (Mainly meant for debugging) */

1749

2418

char *address = strrchr(connect_to, ':');

2419

1750

2420

if(address == NULL){

1751

fprintf(stderr, "No colon in address\n");

2421

fprintf_plus(stderr, "No colon in address\n");

1752

2422

exitcode = EX_USAGE;

1753

2423

goto end;

1754

2424

}

1757

2427

goto end;

1758

2428

}

1759

2429

1760

uint16_t port;

2430

in_port_t port;

1761

2431

errno = 0;

1762

2432

tmpmax = strtoimax(address+1, &tmp, 10);

1763

2433

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1764

or tmpmax != (uint16_t)tmpmax){

1765

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

2434

or tmpmax != (in_port_t)tmpmax){

2435

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

1766

2436

exitcode = EX_USAGE;

1767

2437

goto end;

1768

2438

}

1769

2439

1770

2440

if(quit_now){

1771

2441

goto end;

1772

2442

}

1773

2443

1774

port = (uint16_t)tmpmax;

2444

port = (in_port_t)tmpmax;

1775

2445

*address = '\0';

1776

address = connect_to;

1777

2446

/* Colon in address indicates IPv6 */

1778

2447

int af;

1779

if(strchr(address, ':') != NULL){

2448

if(strchr(connect_to, ':') != NULL){

1780

2449

af = AF_INET6;

2450

/* Accept [] around IPv6 address - see RFC 5952 */

2451

if(connect_to[0] == '[' and address[-1] == ']')

2452

{

2453

connect_to++;

2454

address[-1] = '\0';

2455

}

1781

2456

} else {

1782

2457

af = AF_INET;

1783

2458

}

2459

address = connect_to;

1784

2460

1785

2461

if(quit_now){

1786

2462

goto end;

1787

2463

}

1788

2464

1789

2465

while(not quit_now){

1790

ret = start_mandos_communication(address, port, if_index, af);

2466

ret = start_mandos_communication(address, port, if_index, af,

2467

&mc);

1791

2468

if(quit_now or ret == 0){

1792

2469

break;

1793

2470

}

1794

sleep((int)retry_interval or 1);

1795

};

1796

1797

if (not quit_now){

2471

if(debug){

2472

fprintf_plus(stderr, "Retrying in %d seconds\n",

2473

(int)retry_interval);

2474

}

2475

sleep((unsigned int)retry_interval);

2476

}

2477

2478

if(not quit_now){

1798

2479

exitcode = EXIT_SUCCESS;

1799

2480

}

1800

2481

1801

2482

goto end;

1802

2483

}

1803

2484

1815

2496

config.publish_domain = 0;

1816

2497

1817

2498

/* Allocate a new server */

1818

mc.server = avahi_server_new(avahi_simple_poll_get

1819

(mc.simple_poll), &config, NULL,

1820

NULL, &error);

2499

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2500

&config, NULL, NULL, &ret_errno);

1821

2501

1822

2502

/* Free the Avahi configuration data */

1823

2503

avahi_server_config_free(&config);

1825

2505

1826

2506

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

1827

2507

if(mc.server == NULL){

1828

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

1829

avahi_strerror(error));

2508

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

2509

avahi_strerror(ret_errno));

1830

2510

exitcode = EX_UNAVAILABLE;

1831

2511

goto end;

1832

2512

}

1838

2518

/* Create the Avahi service browser */

1839

2519

sb = avahi_s_service_browser_new(mc.server, if_index,

1840

2520

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1841

NULL, 0, browse_callback, NULL);

2521

NULL, 0, browse_callback,

2522

(void *)&mc);

1842

2523

if(sb == NULL){

1843

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

1844

avahi_strerror(avahi_server_errno(mc.server)));

2524

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

2525

avahi_strerror(avahi_server_errno(mc.server)));

1845

2526

exitcode = EX_UNAVAILABLE;

1846

2527

goto end;

1847

2528

}

1853

2534

/* Run the main loop */

1854

2535

1855

2536

if(debug){

1856

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

2537

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

1857

2538

}

1858

1859

ret = avahi_loop_with_timeout(mc.simple_poll,

1860

(int)(retry_interval * 1000));

2539

2540

ret = avahi_loop_with_timeout(simple_poll,

2541

(int)(retry_interval * 1000), &mc);

1861

2542

if(debug){

1862

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

1863

(ret == 0) ? "successfully" : "with error");

2543

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

2544

(ret == 0) ? "successfully" : "with error");

1864

2545

}

1865

2546

1866

2547

end:

1867

2548

1868

2549

if(debug){

1869

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

2550

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

1870

2551

}

1871

2552

1872

2553

/* Cleanup things */

2554

free(mc.interfaces);

2555

1873

2556

if(sb != NULL)

1874

2557

avahi_s_service_browser_free(sb);

1875

2558

1876

2559

if(mc.server != NULL)

1877

2560

avahi_server_free(mc.server);

1878

2561

1879

if(mc.simple_poll != NULL)

1880

avahi_simple_poll_free(mc.simple_poll);

2562

if(simple_poll != NULL)

2563

avahi_simple_poll_free(simple_poll);

1881

2564

1882

2565

if(gnutls_initialized){

1883

2566

gnutls_certificate_free_credentials(mc.cred);

1888

2571

if(gpgme_initialized){

1889

2572

gpgme_release(mc.ctx);

1890

2573

}

1891

2574

1892

2575

/* Cleans up the circular linked list of Mandos servers the client

1893

2576

has seen */

1894

2577

if(mc.current_server != NULL){

1900

2583

}

1901

2584

}

1902

2585

1903

/* Take down the network interface */

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

1906

errno = 0;

1907

ret = seteuid(0);

1908

if(ret == -1){

1909

perror_plus("seteuid");

2586

/* Re-raise privileges */

2587

{

2588

ret_errno = raise_privileges();

2589

if(ret_errno != 0){

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

/* Take down the network interfaces which were brought up */

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

if(debug and (interfaces_to_take_down == NULL)){

2610

fprintf_plus(stderr, "No interfaces needed to be taken"

2611

" down\n");

2612

}

2613

}

1910

2614

}

1911

if(geteuid() == 0){

1912

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

1913

if(ret == -1){

1914

perror_plus("ioctl SIOCGIFFLAGS");

1915

} else if(network.ifr_flags & IFF_UP) {

1916

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1920

}

1921

}

1922

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

1923

if(ret == -1){

1924

perror_plus("close");

1925

}

1926

/* Lower privileges permanently */

1927

errno = 0;

1928

ret = setuid(uid);

1929

if(ret == -1){

1930

perror_plus("setuid");

1931

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

perror_plus("Failed to lower privileges permanently");

1932

2619

}

1933

2620

}

1934

2621

2622

free(interfaces_to_take_down);

2623

free(interfaces_hooks);

2624

1935

2625

/* Removes the GPGME temp directory and all files inside */

1936

if(tempdir_created){

2626

if(tempdir != NULL){

1937

2627

struct dirent **direntries = NULL;

1938

2628

struct dirent *direntry = NULL;

1939

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1940

if (ret > 0){

1941

for(int i = 0; i < ret; i++){

2629

int numentries = scandir(tempdir, &direntries, notdotentries,

2630

alphasort);

2631

if(numentries > 0){

2632

for(int i = 0; i < numentries; i++){

1942

2633

direntry = direntries[i];

1943

2634

char *fullname = NULL;

1944

2635

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

1949

2640

}

1950

2641

ret = remove(fullname);

1951

2642

if(ret == -1){

1952

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

1953

strerror(errno));

2643

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

2644

strerror(errno));

1954

2645

}

1955

2646

free(fullname);

1956

2647

}

1957

2648

}

1958

1959

/* need to be cleaned even if ret == 0 because man page doesn't

1960

specify */

2649

2650

/* need to clean even if 0 because man page doesn't specify */

1961

2651

free(direntries);

1962

if (ret == -1){

2652

if(numentries == -1){

1963

2653

perror_plus("scandir");

1964

2654

}

1965

2655

ret = rmdir(tempdir);