/mandos/release : revision 237.15.4

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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

32

/* 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 /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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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() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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

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asprintf(), strncpy() */

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

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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

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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(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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

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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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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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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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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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in_port_t port;

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uint16_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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/* Used for passing in values through the Avahi callback functions */

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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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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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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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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sig_atomic_t quit_now = 0;

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165

int signal_received = 0;

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/* Function to use when printing errors */

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168

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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170

program_invocation_short_name);

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errno = e;

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171

perror(print_text);

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}

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

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174

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

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va_list ap;

195

176

va_start (ap, format);

196

177

197

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

198

program_invocation_short_name));

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

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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

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

200

180

}

201

181

202

182

/*

204

184

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

205

185

* "buffer_length" is how much is already used.

206

186

*/

207

__attribute__((nonnull, warn_unused_result))

208

187

size_t incbuffer(char **buffer, size_t buffer_length,

209

size_t buffer_capacity){

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size_t buffer_capacity){

210

189

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

212

if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

190

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

191

if(buffer == NULL){

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192

return 0;

218

193

}

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*buffer = new_buf;

220

194

buffer_capacity += BUFFER_SIZE;

221

195

}

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return buffer_capacity;

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197

}

224

198

225

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

226

__attribute__((nonnull, warn_unused_result))

227

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

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int af, server **current_server){

200

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

229

203

int ret;

230

204

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

231

205

if(new_server == NULL){

232

206

perror_plus("malloc");

233

return false;

207

return -1;

234

208

}

235

209

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

236

.port = port,

237

.if_index = if_index,

238

.af = af };

210

.port = port,

211

.if_index = if_index,

212

.af = af };

239

213

if(new_server->ip == NULL){

240

214

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

free((char *)(new_server->ip));

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

256

return false;

215

return -1;

257

216

}

258

217

/* Special case of first server */

259

if(*current_server == NULL){

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if (mc.current_server == NULL){

260

219

new_server->next = new_server;

261

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

263

223

} else {

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

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

270

return true;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

231

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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*/

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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){

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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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242

gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

283

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284

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/*

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

286

248

*/

287

bool import_key(const char * const filename){

249

bool import_key(const char *filename){

288

250

int ret;

289

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int fd;

290

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gpgme_data_t pgp_data;

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298

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

299

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if(rc != GPG_ERR_NO_ERROR){

300

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

303

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}

304

266

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

267

rc = gpgme_op_import(mc.ctx, pgp_data);

306

268

if(rc != GPG_ERR_NO_ERROR){

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

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gpgme_strsource(rc), gpgme_strerror(rc));

309

271

return false;

310

272

}

311

273

312

ret = close(fd);

274

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

313

275

if(ret == -1){

314

276

perror_plus("close");

315

277

}

318

280

}

319

281

320

282

if(debug){

321

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

283

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

322

284

}

323

285

324

286

/* Init GPGME */

325

287

gpgme_check_version(NULL);

326

288

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

327

289

if(rc != GPG_ERR_NO_ERROR){

328

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

329

gpgme_strsource(rc), gpgme_strerror(rc));

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

330

292

return false;

331

293

}

332

294

333

295

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

334

296

rc = gpgme_get_engine_info(&engine_info);

335

297

if(rc != GPG_ERR_NO_ERROR){

336

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

337

gpgme_strsource(rc), gpgme_strerror(rc));

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

338

300

return false;

339

301

}

340

302

while(engine_info != NULL){

346

308

engine_info = engine_info->next;

347

309

}

348

310

if(engine_info == NULL){

349

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

350

tempdir);

311

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

351

312

return false;

352

313

}

353

314

354

315

/* Create new GPGME "context" */

355

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

316

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

356

317

if(rc != GPG_ERR_NO_ERROR){

357

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

358

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

359

gpgme_strerror(rc));

318

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

319

gpgme_strsource(rc), gpgme_strerror(rc));

360

320

return false;

361

321

}

362

322

371

331

* Decrypt OpenPGP data.

372

332

* Returns -1 on error

373

333

*/

374

__attribute__((nonnull, warn_unused_result))

375

334

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

335

size_t crypto_size,

377

char **plaintext,

378

mandos_context *mc){

336

char **plaintext){

379

337

gpgme_data_t dh_crypto, dh_plain;

380

338

gpgme_error_t rc;

381

339

ssize_t ret;

383

341

ssize_t plaintext_length = 0;

384

342

385

343

if(debug){

386

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

344

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

387

345

}

388

346

389

347

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

390

348

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

391

349

0);

392

350

if(rc != GPG_ERR_NO_ERROR){

393

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

394

gpgme_strsource(rc), gpgme_strerror(rc));

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

395

353

return -1;

396

354

}

397

355

398

356

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

399

357

rc = gpgme_data_new(&dh_plain);

400

358

if(rc != GPG_ERR_NO_ERROR){

401

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

402

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

403

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

404

361

gpgme_data_release(dh_crypto);

405

362

return -1;

406

363

}

407

364

408

365

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

409

366

data buffer */

410

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

367

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

411

368

if(rc != GPG_ERR_NO_ERROR){

412

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

413

gpgme_strsource(rc), gpgme_strerror(rc));

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

414

371

plaintext_length = -1;

415

372

if(debug){

416

373

gpgme_decrypt_result_t result;

417

result = gpgme_op_decrypt_result(mc->ctx);

374

result = gpgme_op_decrypt_result(mc.ctx);

418

375

if(result == NULL){

419

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

376

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

420

377

} else {

421

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

422

result->unsupported_algorithm);

423

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

424

result->wrong_key_usage);

378

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

379

result->unsupported_algorithm);

380

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

381

result->wrong_key_usage);

425

382

if(result->file_name != NULL){

426

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

383

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

427

384

}

428

385

gpgme_recipient_t recipient;

429

386

recipient = result->recipients;

430

387

while(recipient != NULL){

431

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

432

gpgme_pubkey_algo_name

433

(recipient->pubkey_algo));

434

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

435

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

436

recipient->status == GPG_ERR_NO_SECKEY

437

? "No" : "Yes");

388

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

389

gpgme_pubkey_algo_name(recipient->pubkey_algo));

390

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

391

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

392

recipient->status == GPG_ERR_NO_SECKEY

393

? "No" : "Yes");

438

394

recipient = recipient->next;

439

395

}

440

396

}

443

399

}

444

400

445

401

if(debug){

446

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

402

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

447

403

}

448

404

449

405

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

456

412

*plaintext = NULL;

457

413

while(true){

458

414

plaintext_capacity = incbuffer(plaintext,

459

(size_t)plaintext_length,

460

plaintext_capacity);

415

(size_t)plaintext_length,

416

plaintext_capacity);

461

417

if(plaintext_capacity == 0){

462

perror_plus("incbuffer");

463

plaintext_length = -1;

464

goto decrypt_end;

418

perror_plus("incbuffer");

419

plaintext_length = -1;

420

goto decrypt_end;

465

421

}

466

422

467

423

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

480

436

}

481

437

482

438

if(debug){

483

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

439

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

484

440

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

485

441

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

486

442

}

497

453

return plaintext_length;

498

454

}

499

455

500

__attribute__((warn_unused_result, const))

501

static const char *safe_string(const char *str){

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

509

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

456

static const char * safer_gnutls_strerror(int value){

457

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

458

-Wunreachable-code */

459

if(ret == NULL)

460

ret = "(unknown)";

461

return ret;

511

462

}

512

463

513

464

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

465

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

516

466

const char* string){

517

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

467

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

518

468

}

519

469

520

__attribute__((nonnull(1, 2, 4), warn_unused_result))

521

470

static int init_gnutls_global(const char *pubkeyfilename,

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

mandos_context *mc){

471

const char *seckeyfilename){

525

472

int ret;

526

unsigned int uret;

527

473

528

474

if(debug){

529

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

475

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

476

}

477

478

ret = gnutls_global_init();

479

if(ret != GNUTLS_E_SUCCESS){

480

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

481

safer_gnutls_strerror(ret));

482

return -1;

530

483

}

531

484

532

485

if(debug){

538

491

}

539

492

540

493

/* OpenPGP credentials */

541

ret = gnutls_certificate_allocate_credentials(&mc->cred);

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

542

495

if(ret != GNUTLS_E_SUCCESS){

543

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

544

safer_gnutls_strerror(ret));

496

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

497

safer_gnutls_strerror(ret));

498

gnutls_global_deinit();

545

499

return -1;

546

500

}

547

501

548

502

if(debug){

549

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

550

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

551

pubkeyfilename,

552

seckeyfilename);

503

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

504

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

505

seckeyfilename);

553

506

}

554

507

555

508

ret = gnutls_certificate_set_openpgp_key_file

556

(mc->cred, pubkeyfilename, seckeyfilename,

509

(mc.cred, pubkeyfilename, seckeyfilename,

557

510

GNUTLS_OPENPGP_FMT_BASE64);

558

511

if(ret != GNUTLS_E_SUCCESS){

559

fprintf_plus(stderr,

560

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

561

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

562

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

563

safer_gnutls_strerror(ret));

512

fprintf(stderr,

513

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

514

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

515

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

516

safer_gnutls_strerror(ret));

564

517

goto globalfail;

565

518

}

566

519

567

520

/* GnuTLS server initialization */

568

ret = gnutls_dh_params_init(&mc->dh_params);

569

if(ret != GNUTLS_E_SUCCESS){

570

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

571

" initialization: %s\n",

572

safer_gnutls_strerror(ret));

573

goto globalfail;

574

}

575

/* If a Diffie-Hellman parameters file was given, try to use it */

576

if(dhparamsfilename != NULL){

577

gnutls_datum_t params = { .data = NULL, .size = 0 };

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

params_capacity = incbuffer((char **)&params.data,

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

fprintf_plus(stderr, "Failed to parse DH parameters in file"

624

" \"%s\": %s\n", dhparamsfilename,

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

/* Find out the optimal number of DH bits */

633

/* Try to read the private key file */

634

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

buffer_capacity = incbuffer((char **)&buffer.data,

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

/* If successful, use buffer to parse private key */

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

" a GnuTLS security parameter \"%s\".\n",

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

722

" implies %u DH bits; using that.\n",

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

fprintf_plus(stderr, "Failed to get implied number of DH"

729

" bits for security parameter \"%s\"): %s\n",

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

742

" bits): %s\n", mc->dh_bits,

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

747

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

521

ret = gnutls_dh_params_init(&mc.dh_params);

522

if(ret != GNUTLS_E_SUCCESS){

523

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

524

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

525

goto globalfail;

526

}

527

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

528

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

531

goto globalfail;

532

}

533

534

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

748

535

749

536

return 0;

750

537

751

538

globalfail:

752

539

753

gnutls_certificate_free_credentials(mc->cred);

754

gnutls_dh_params_deinit(mc->dh_params);

540

gnutls_certificate_free_credentials(mc.cred);

541

gnutls_global_deinit();

542

gnutls_dh_params_deinit(mc.dh_params);

755

543

return -1;

756

544

}

757

545

758

__attribute__((nonnull, warn_unused_result))

759

static int init_gnutls_session(gnutls_session_t *session,

760

mandos_context *mc){

546

static int init_gnutls_session(gnutls_session_t *session){

761

547

int ret;

762

548

/* GnuTLS session creation */

763

549

do {

767

553

}

768

554

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

769

555

if(ret != GNUTLS_E_SUCCESS){

770

fprintf_plus(stderr,

771

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

772

safer_gnutls_strerror(ret));

556

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

557

safer_gnutls_strerror(ret));

773

558

}

774

559

775

560

{

776

561

const char *err;

777

562

do {

778

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

563

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

779

564

if(quit_now){

780

565

gnutls_deinit(*session);

781

566

return -1;

782

567

}

783

568

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

784

569

if(ret != GNUTLS_E_SUCCESS){

785

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

786

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

787

safer_gnutls_strerror(ret));

570

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

571

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

572

safer_gnutls_strerror(ret));

788

573

gnutls_deinit(*session);

789

574

return -1;

790

575

}

792

577

793

578

do {

794

579

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

795

mc->cred);

580

mc.cred);

796

581

if(quit_now){

797

582

gnutls_deinit(*session);

798

583

return -1;

799

584

}

800

585

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

801

586

if(ret != GNUTLS_E_SUCCESS){

802

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

803

safer_gnutls_strerror(ret));

587

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

588

safer_gnutls_strerror(ret));

804

589

gnutls_deinit(*session);

805

590

return -1;

806

591

}

808

593

/* ignore client certificate if any. */

809

594

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

595

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

597

811

598

return 0;

812

599

}

813

600

815

602

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

816

603

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

817

604

818

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

819

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

823

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

824

ret = errno;

825

}

826

errno = old_errno;

827

return ret;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

836

errno = old_errno;

837

return ret;

838

}

839

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

840

ret = errno;

841

}

842

errno = old_errno;

843

return ret;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

851

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

852

ret = errno;

853

}

854

errno = old_errno;

855

return ret;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

863

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

864

ret = errno;

865

}

866

errno = old_errno;

867

return ret;

868

}

869

870

/* Helper function to add_local_route() and delete_local_route() */

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

char helper[] = "mandos-client-iprouteadddel";

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

" variable not set; cannot run helper\n");

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

perror_plus("open(\"/dev/null\", O_RDONLY)");

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

{ helper, add ? add_arg : delete_arg, (char *)address,

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

pret = waitpid(pid, &status, 0);

980

if(pret == -1 and errno == EINTR and quit_now){

981

int errno_raising = 0;

982

if((errno = raise_privileges()) != 0){

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

if(kill(pid, SIGTERM) == -1){

988

perror_plus("kill");

989

}

990

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

} while(pret == -1 and errno == EINTR);

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

" with status %d\n", WEXITSTATUS(status));

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

" signal %d\n", WTERMSIG(status));

1012

return false;

1013

}

1014

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

fprintf_plus(stderr, "Adding route to %s\n", address);

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

fprintf_plus(stderr, "Removing route to %s\n", address);

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

605

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

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

606

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

1039

607

AvahiIfIndex if_index,

1040

int af, mandos_context *mc){

608

int af){

1041

609

int ret, tcp_sd = -1;

1042

610

ssize_t sret;

1043

struct sockaddr_storage to;

611

union {

612

struct sockaddr_in in;

613

struct sockaddr_in6 in6;

614

} to;

1044

615

char *buffer = NULL;

1045

616

char *decrypted_buffer = NULL;

1046

617

size_t buffer_length = 0;

1049

620

int retval = -1;

1050

621

gnutls_session_t session;

1051

622

int pf; /* Protocol family */

1052

bool route_added = false;

1053

623

1054

624

errno = 0;

1055

625

1066

636

pf = PF_INET;

1067

637

break;

1068

638

default:

1069

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

639

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

1070

640

errno = EINVAL;

1071

641

return -1;

1072

642

}

1073

643

1074

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

1075

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

1076

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

1077

bool match = false;

1078

{

1079

char *interface = NULL;

1080

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

1081

interface))){

1082

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

1083

match = true;

1084

break;

1085

}

1086

}

1087

}

1088

if(not match){

1089

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

1090

connect to the server */

1091

if(debug){

1092

char interface[IF_NAMESIZE];

1093

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

1094

perror_plus("if_indextoname");

1095

} else {

1096

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

1097

" \"%s\"\n",

1098

if_indextoname((unsigned int)if_index,

1099

interface));

1100

}

1101

}

1102

return -1;

1103

}

1104

}

1105

1106

ret = init_gnutls_session(&session, mc);

644

ret = init_gnutls_session(&session);

1107

645

if(ret != 0){

1108

646

return -1;

1109

647

}

1110

648

1111

649

if(debug){

1112

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

1113

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

650

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

651

"\n", ip, port);

1114

652

}

1115

653

1116

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

655

if(tcp_sd < 0){

1118

656

int e = errno;

1119

657

perror_plus("socket");

1126

664

goto mandos_end;

1127

665

}

1128

666

667

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

1129

668

if(af == AF_INET6){

1130

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1131

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1132

ret = inet_pton(af, ip, &to6->sin6_addr);

669

to.in6.sin6_family = (sa_family_t)af;

670

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

1133

671

} else { /* IPv4 */

1134

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1135

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1136

ret = inet_pton(af, ip, &to4->sin_addr);

672

to.in.sin_family = (sa_family_t)af;

673

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

1137

674

}

1138

675

if(ret < 0 ){

1139

676

int e = errno;

1143

680

}

1144

681

if(ret == 0){

1145

682

int e = errno;

1146

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

683

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

1147

684

errno = e;

1148

685

goto mandos_end;

1149

686

}

1150

687

if(af == AF_INET6){

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

688

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

689

-Wconversion and

690

-Wunreachable-code */

691

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

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

694

-Wunreachable-code*/

1154

695

if(if_index == AVAHI_IF_UNSPEC){

1155

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

1156

" incomplete without a network interface\n");

696

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

697

" without a network interface\n");

1157

698

errno = EINVAL;

1158

699

goto mandos_end;

1159

700

}

1160

701

/* Set the network interface number as scope */

1161

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

702

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

703

}

1163

704

} else {

1164

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

705

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

706

-Wconversion and

707

-Wunreachable-code */

1165

708

}

1166

709

1167

710

if(quit_now){

1175

718

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

1176

719

perror_plus("if_indextoname");

1177

720

} else {

1178

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

1179

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

721

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

722

ip, interface, port);

1180

723

}

1181

724

} else {

1182

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

1183

ip, (uintmax_t)port);

725

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

726

port);

1184

727

}

1185

728

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

729

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1187

if(af == AF_INET6){

1188

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

1189

sizeof(struct sockaddr_in6),

1190

addrstr, sizeof(addrstr), NULL, 0,

1191

NI_NUMERICHOST);

1192

} else {

1193

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

1194

sizeof(struct sockaddr_in),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

}

1198

if(ret == EAI_SYSTEM){

1199

perror_plus("getnameinfo");

1200

} else if(ret != 0) {

1201

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

1202

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

1203

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

1204

}

1205

}

1206

1207

if(quit_now){

1208

errno = EINTR;

1209

goto mandos_end;

1210

}

1211

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1231

& 0xFFFF0000L) != 0xA9FE0000L))){

1232

/* Work around Avahi bug - Avahi does not announce link-local

1233

addresses if it has a global address, so local hosts with

1234

*only* a link-local address (e.g. Mandos clients) cannot

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

with an explicit route added with the server's address.

1238

1239

Avahi bug reference:

1240

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

break;

730

const char *pcret;

731

if(af == AF_INET6){

732

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

733

sizeof(addrstr));

734

} else {

735

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

736

sizeof(addrstr));

737

}

738

if(pcret == NULL){

739

perror_plus("inet_ntop");

740

} else {

741

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

742

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

743

}

744

}

745

}

746

747

if(quit_now){

748

errno = EINTR;

749

goto mandos_end;

750

}

751

752

if(af == AF_INET6){

753

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

754

} else {

755

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

756

}

757

if(ret < 0){

758

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

759

int e = errno;

760

perror_plus("connect");

761

errno = e;

762

}

763

goto mandos_end;

764

}

765

766

if(quit_now){

767

errno = EINTR;

768

goto mandos_end;

1267

769

}

1268

770

1269

771

const char *out = mandos_protocol_version;

1271

773

while(true){

1272

774

size_t out_size = strlen(out);

1273

775

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

1274

out_size - written));

776

out_size - written));

1275

777

if(ret == -1){

1276

778

int e = errno;

1277

779

perror_plus("write");

1297

799

}

1298

800

1299

801

if(debug){

1300

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

802

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

1301

803

}

1302

804

1303

805

if(quit_now){

1305

807

goto mandos_end;

1306

808

}

1307

809

1308

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

1309

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

1310

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

1311

gnutls_transport_set_ptr(session,

1312

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

810

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

811

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1313

812

1314

813

if(quit_now){

1315

814

errno = EINTR;

1326

825

1327

826

if(ret != GNUTLS_E_SUCCESS){

1328

827

if(debug){

1329

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

828

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

1330

829

gnutls_perror(ret);

1331

830

}

1332

831

errno = EPROTO;

1336

835

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

1337

836

1338

837

if(debug){

1339

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1340

" %s\n", ip);

838

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

839

ip);

1341

840

}

1342

841

1343

842

while(true){

1348

847

}

1349

848

1350

849

buffer_capacity = incbuffer(&buffer, buffer_length,

1351

buffer_capacity);

850

buffer_capacity);

1352

851

if(buffer_capacity == 0){

1353

852

int e = errno;

1354

853

perror_plus("incbuffer");

1381

880

}

1382

881

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

1383

882

if(ret < 0){

1384

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

1385

"***\n");

883

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

1386

884

gnutls_perror(ret);

1387

885

errno = EPROTO;

1388

886

goto mandos_end;

1389

887

}

1390

888

break;

1391

889

default:

1392

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

1393

" encrypted session with Mandos server\n");

890

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

891

" encrypted session with Mandos server\n");

1394

892

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1395

893

errno = EIO;

1396

894

goto mandos_end;

1401

899

}

1402

900

1403

901

if(debug){

1404

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

902

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

1405

903

}

1406

904

1407

905

if(quit_now){

1419

917

1420

918

if(buffer_length > 0){

1421

919

ssize_t decrypted_buffer_size;

1422

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1423

&decrypted_buffer, mc);

920

decrypted_buffer_size = pgp_packet_decrypt(buffer,

921

buffer_length,

922

&decrypted_buffer);

1424

923

if(decrypted_buffer_size >= 0){

1425

924

1426

925

written = 0;

1436

935

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

1437

936

int e = errno;

1438

937

if(debug){

1439

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

1440

strerror(errno));

938

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

939

strerror(errno));

1441

940

}

1442

941

errno = e;

1443

942

goto mandos_end;

1452

951

1453

952

mandos_end:

1454

953

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

fprintf_plus(stderr, "Failed to delete local route to %s on"

1458

" interface %d", ip, if_index);

1459

}

1460

}

1461

954

int e = errno;

1462

955

free(decrypted_buffer);

1463

956

free(buffer);

1464

957

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

958

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

1466

959

}

1467

960

if(ret == -1){

1468

961

if(e == 0){

1480

973

return retval;

1481

974

}

1482

975

1483

__attribute__((nonnull))

1484

976

static void resolve_callback(AvahiSServiceResolver *r,

1485

977

AvahiIfIndex interface,

1486

978

AvahiProtocol proto,

1494

986

AVAHI_GCC_UNUSED AvahiStringList *txt,

1495

987

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

988

flags,

1497

void *mc){

1498

if(r == NULL){

1499

return;

1500

}

989

AVAHI_GCC_UNUSED void* userdata){

990

assert(r);

1501

991

1502

992

/* Called whenever a service has been resolved successfully or

1503

993

timed out */

1504

994

1505

995

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1507

996

return;

1508

997

}

1509

998

1510

999

switch(event){

1511

1000

default:

1512

1001

case AVAHI_RESOLVER_FAILURE:

1513

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

1514

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

1515

domain,

1516

avahi_strerror(avahi_server_errno

1517

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

1002

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

1003

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

1004

avahi_strerror(avahi_server_errno(mc.server)));

1518

1005

break;

1519

1006

1520

1007

case AVAHI_RESOLVER_FOUND:

1522

1009

char ip[AVAHI_ADDRESS_STR_MAX];

1523

1010

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

1524

1011

if(debug){

1525

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

1526

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

1527

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

1012

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

1013

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

1014

ip, (intmax_t)interface, port);

1528

1015

}

1529

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

1530

interface,

1531

avahi_proto_to_af(proto),

1532

mc);

1016

int ret = start_mandos_communication(ip, port, interface,

1017

avahi_proto_to_af(proto));

1533

1018

if(ret == 0){

1534

avahi_simple_poll_quit(simple_poll);

1019

avahi_simple_poll_quit(mc.simple_poll);

1535

1020

} else {

1536

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

1537

avahi_proto_to_af(proto),

1538

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

1539

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

1540

" list\n", name);

1541

}

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

1542

1023

}

1543

1024

}

1544

1025

}

1554

1035

const char *domain,

1555

1036

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1556

1037

flags,

1557

void *mc){

1558

if(b == NULL){

1559

return;

1560

}

1038

AVAHI_GCC_UNUSED void* userdata){

1039

assert(b);

1561

1040

1562

1041

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

1563

1042

is removed from the LAN */

1570

1049

default:

1571

1050

case AVAHI_BROWSER_FAILURE:

1572

1051

1573

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

1574

avahi_strerror(avahi_server_errno

1575

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

1576

avahi_simple_poll_quit(simple_poll);

1052

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

1053

avahi_strerror(avahi_server_errno(mc.server)));

1054

avahi_simple_poll_quit(mc.simple_poll);

1577

1055

return;

1578

1056

1579

1057

case AVAHI_BROWSER_NEW:

1582

1060

the callback function is called the Avahi server will free the

1583

1061

resolver for us. */

1584

1062

1585

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

1586

interface, protocol, name, type,

1587

domain, protocol, 0,

1588

resolve_callback, mc) == NULL)

1589

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

1590

" %s\n", name,

1591

avahi_strerror(avahi_server_errno

1592

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

1063

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

1064

name, type, domain, protocol, 0,

1065

resolve_callback, NULL) == NULL)

1066

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

1067

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

1593

1068

break;

1594

1069

1595

1070

case AVAHI_BROWSER_REMOVE:

1598

1073

case AVAHI_BROWSER_ALL_FOR_NOW:

1599

1074

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1600

1075

if(debug){

1601

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

1602

" searching...\n");

1076

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

1603

1077

}

1604

1078

break;

1605

1079

}

1614

1088

signal_received = sig;

1615

1089

int old_errno = errno;

1616

1090

/* set main loop to exit */

1617

if(simple_poll != NULL){

1618

avahi_simple_poll_quit(simple_poll);

1091

if(mc.simple_poll != NULL){

1092

avahi_simple_poll_quit(mc.simple_poll);

1619

1093

}

1620

1094

errno = old_errno;

1621

1095

}

1622

1096

1623

__attribute__((nonnull, warn_unused_result))

1624

1097

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

1625

1098

int ret;

1626

int old_errno;

1627

1099

1628

1100

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

1629

1101

if(s < 0){

1630

old_errno = errno;

1631

1102

perror_plus("socket");

1632

errno = old_errno;

1633

1103

return false;

1634

1104

}

1635

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1636

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1105

strcpy(ifr->ifr_name, ifname);

1637

1106

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

1107

if(ret == -1){

1639

1108

if(debug){

1640

old_errno = errno;

1641

1109

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = old_errno;

1643

1110

}

1644

1111

return false;

1645

1112

}

1646

1113

return true;

1647

1114

}

1648

1115

1649

__attribute__((nonnull, warn_unused_result))

1650

1116

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

1651

1117

1652

1118

/* Reject the loopback device */

1653

1119

if(ifr->ifr_flags & IFF_LOOPBACK){

1654

1120

if(debug){

1655

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

1656

ifname);

1121

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

1122

ifname);

1657

1123

}

1658

1124

return false;

1659

1125

}

1660

1126

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

1661

1127

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

1662

1128

if(debug){

1663

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

1664

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

1129

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

1130

ifname);

1665

1131

}

1666

1132

return true;

1667

1133

}

1668

1134

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

1669

1135

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

1670

1136

if(debug){

1671

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1672

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

1137

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

1138

ifname);

1673

1139

}

1674

1140

return false;

1675

1141

}

1676

1142

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

1677

1143

if(ifr->ifr_flags & IFF_NOARP){

1678

1144

if(debug){

1679

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

1680

ifname);

1145

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

1681

1146

}

1682

1147

return false;

1683

1148

}

1684

1149

1685

1150

/* Accept this device */

1686

1151

if(debug){

1687

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

1152

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

1688

1153

}

1689

1154

return true;

1690

1155

}

1694

1159

* corresponds to an acceptable network device.

1695

1160

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

1696

1161

*/

1697

__attribute__((nonnull, warn_unused_result))

1698

1162

int good_interface(const struct dirent *if_entry){

1163

int ret;

1699

1164

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

1700

1165

return 0;

1701

1166

}

1702

1703

1167

struct ifreq ifr;

1168

1704

1169

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

1705

if(debug){

1706

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

1707

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

1708

}

1709

1170

return 0;

1710

1171

}

1711

1172

1716

1177

}

1717

1178

1718

1179

/*

1719

* This function determines if a network interface is up.

1720

*/

1721

__attribute__((nonnull, warn_unused_result))

1722

bool interface_is_up(const char *interface){

1723

struct ifreq ifr;

1724

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

1725

if(debug){

1726

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

1727

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

1728

}

1729

return false;

1730

}

1731

1732

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

1733

}

1734

1735

/*

1736

* This function determines if a network interface is running

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

bool interface_is_running(const char *interface){

1740

struct ifreq ifr;

1741

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

1742

if(debug){

1743

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

1744

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

1745

}

1746

return false;

1747

}

1748

1749

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

1750

}

1751

1752

__attribute__((nonnull, pure, warn_unused_result))

1180

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

1181

* corresponds to an acceptable network device which is up.

1182

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

1183

*/

1184

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

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

1188

return 0;

1189

}

1190

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

1191

if_entry->d_name);

1192

if(ret < 0){

1193

perror_plus("asprintf");

1194

return 0;

1195

}

1196

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

1197

if(flags_fd == -1){

1198

perror_plus("open");

1199

free(flagname);

1200

return 0;

1201

}

1202

free(flagname);

1203

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

1204

/* read line from flags_fd */

1205

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

1206

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

1207

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

1208

if(flagstring == NULL){

1209

perror_plus("malloc");

1210

close(flags_fd);

1211

return 0;

1212

}

1213

while(to_read > 0){

1214

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

1215

(size_t)to_read));

1216

if(ssret == -1){

1217

perror_plus("read");

1218

free(flagstring);

1219

close(flags_fd);

1220

return 0;

1221

}

1222

to_read -= ssret;

1223

if(ssret == 0){

1224

break;

1225

}

1226

}

1227

close(flags_fd);

1228

intmax_t tmpmax;

1229

char *tmp;

1230

errno = 0;

1231

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

1232

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

1233

and not (isspace(*tmp)))

1234

or tmpmax != (ifreq_flags)tmpmax){

1235

if(debug){

1236

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

1237

flagstring, if_entry->d_name);

1238

}

1239

free(flagstring);

1240

return 0;

1241

}

1242

free(flagstring);

1243

ifreq_flags flags = (ifreq_flags)tmpmax;

1244

/* Reject the loopback device */

1245

if(flags & IFF_LOOPBACK){

1246

if(debug){

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1256

}

1257

1258

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

1259

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

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

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

1285

if_entry->d_name);

1286

}

1287

return 1;

1288

}

1289

1753

1290

int notdotentries(const struct dirent *direntry){

1754

1291

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

1755

1292

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

1762

1299

}

1763

1300

1764

1301

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

1765

__attribute__((nonnull, warn_unused_result))

1766

1302

int runnable_hook(const struct dirent *direntry){

1767

1303

int ret;

1768

size_t sret;

1769

1304

struct stat st;

1770

1305

1771

1306

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

1773

1308

return 0;

1774

1309

}

1775

1310

1776

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

1777

"abcdefghijklmnopqrstuvwxyz"

1778

"0123456789"

1779

"_.-");

1780

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

1781

/* Contains non-allowed characters */

1782

if(debug){

1783

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

1784

direntry->d_name);

1785

}

1786

return 0;

1787

}

1788

1789

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1311

/* Save pointer to last character */

1312

char *end = strchr(direntry->d_name, '\0')-1;

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

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

1320

and (*end == '#')){

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

ret = stat(direntry->d_name, &st);

1790

1328

if(ret == -1){

1791

1329

if(debug){

1792

perror_plus("Could not stat hook");

1330

perror_plus("Could not stat plugin");

1793

1331

}

1794

1332

return 0;

1795

1333

}

1796

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

1334

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

1797

1335

/* Not a regular file */

1798

if(debug){

1799

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

1800

direntry->d_name);

1801

}

1802

1336

return 0;

1803

1337

}

1804

1338

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

1805

1339

/* Not executable */

1806

if(debug){

1807

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

1808

direntry->d_name);

1809

}

1810

1340

return 0;

1811

1341

}

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1816

1342

return 1;

1817

1343

}

1818

1344

1819

__attribute__((nonnull, warn_unused_result))

1820

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1821

mandos_context *mc){

1345

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1822

1346

int ret;

1823

1347

struct timespec now;

1824

1348

struct timespec waited_time;

1825

1349

intmax_t block_time;

1826

1350

1827

1351

while(true){

1828

if(mc->current_server == NULL){

1829

if(debug){

1830

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

1831

" No timeout!\n");

1352

if(mc.current_server == NULL){

1353

if (debug){

1354

fprintf(stderr,

1355

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

1832

1356

}

1833

1357

ret = avahi_simple_poll_iterate(s, -1);

1834

1358

} else {

1835

if(debug){

1836

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

1837

" it, or wait\n");

1359

if (debug){

1360

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

1361

" or wait\n");

1838

1362

}

1839

1363

/* the current time */

1840

1364

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1845

1369

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

1846

1370

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

1847

1371

waited_time.tv_sec = (now.tv_sec

1848

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

1372

- mc.current_server->last_seen.tv_sec);

1849

1373

waited_time.tv_nsec = (now.tv_nsec

1850

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

1374

- mc.current_server->last_seen.tv_nsec);

1851

1375

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

1852

1376

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

1853

1377

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

1855

1379

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

1856

1380

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

1857

1381

1858

if(debug){

1859

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

1860

block_time);

1382

if (debug){

1383

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

1861

1384

}

1862

1385

1863

1386

if(block_time <= 0){

1864

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

1865

mc->current_server->port,

1866

mc->current_server->if_index,

1867

mc->current_server->af, mc);

1387

ret = start_mandos_communication(mc.current_server->ip,

1388

mc.current_server->port,

1389

mc.current_server->if_index,

1390

mc.current_server->af);

1868

1391

if(ret == 0){

1869

avahi_simple_poll_quit(s);

1392

avahi_simple_poll_quit(mc.simple_poll);

1870

1393

return 0;

1871

1394

}

1872

1395

ret = clock_gettime(CLOCK_MONOTONIC,

1873

&mc->current_server->last_seen);

1396

&mc.current_server->last_seen);

1874

1397

if(ret == -1){

1875

1398

perror_plus("clock_gettime");

1876

1399

return -1;

1877

1400

}

1878

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

1401

mc.current_server = mc.current_server->next;

1879

1402

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

1880

1403

servers, but don't block */

1881

1404

}

1883

1406

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

1884

1407

}

1885

1408

if(ret != 0){

1886

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

1409

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

1887

1410

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

1888

1411

}

1889

1412

}

1890

1413

}

1891

1414

}

1892

1415

1893

__attribute__((nonnull))

1894

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

1895

const float delay){

1896

struct dirent **direntries = NULL;

1897

if(hookdir_fd == -1){

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1900

if(hookdir_fd == -1){

1901

if(errno == ENOENT){

1902

if(debug){

1903

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

1904

" found\n", hookdir);

1905

}

1906

} else {

1907

perror_plus("open");

1908

}

1909

return;

1910

}

1911

}

1912

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

1913

runnable_hook, alphasort);

1914

if(numhooks == -1){

1915

perror_plus("scandir");

1916

return;

1917

}

1918

struct dirent *direntry;

1919

int ret;

1920

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

1921

if(devnull == -1){

1922

perror_plus("open(\"/dev/null\", O_RDONLY)");

1923

return;

1924

}

1925

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

1926

direntry = direntries[i];

1927

if(debug){

1928

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

1929

direntry->d_name);

1930

}

1931

pid_t hook_pid = fork();

1932

if(hook_pid == 0){

1933

/* Child */

1934

/* Raise privileges */

1935

errno = raise_privileges_permanently();

1936

if(errno != 0){

1937

perror_plus("Failed to raise privileges");

1938

_exit(EX_NOPERM);

1939

}

1940

/* Set group */

1941

errno = 0;

1942

ret = setgid(0);

1943

if(ret == -1){

1944

perror_plus("setgid");

1945

_exit(EX_NOPERM);

1946

}

1947

/* Reset supplementary groups */

1948

errno = 0;

1949

ret = setgroups(0, NULL);

1950

if(ret == -1){

1951

perror_plus("setgroups");

1952

_exit(EX_NOPERM);

1953

}

1954

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

1955

if(ret == -1){

1956

perror_plus("setenv");

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("setenv");

1962

_exit(EX_OSERR);

1963

}

1964

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

1965

if(ret == -1){

1966

perror_plus("setenv");

1967

_exit(EX_OSERR);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

char *delaystring;

1975

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

1976

if(ret == -1){

1977

perror_plus("asprintf");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1982

free(delaystring);

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

free(delaystring);

1987

if(connect_to != NULL){

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

}

1994

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

1995

direntry->d_name,

1996

O_RDONLY));

1997

if(hook_fd == -1){

1998

perror_plus("openat");

1999

_exit(EXIT_FAILURE);

2000

}

2001

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

2002

perror_plus("close");

2003

_exit(EXIT_FAILURE);

2004

}

2005

ret = dup2(devnull, STDIN_FILENO);

2006

if(ret == -1){

2007

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

2008

_exit(EX_OSERR);

2009

}

2010

ret = close(devnull);

2011

if(ret == -1){

2012

perror_plus("close");

2013

_exit(EX_OSERR);

2014

}

2015

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2016

if(ret == -1){

2017

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

2018

_exit(EX_OSERR);

2019

}

2020

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2021

environ) == -1){

2022

perror_plus("fexecve");

2023

_exit(EXIT_FAILURE);

2024

}

2025

} else {

2026

if(hook_pid == -1){

2027

perror_plus("fork");

2028

free(direntry);

2029

continue;

2030

}

2031

int status;

2032

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

2033

perror_plus("waitpid");

2034

free(direntry);

2035

continue;

2036

}

2037

if(WIFEXITED(status)){

2038

if(WEXITSTATUS(status) != 0){

2039

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

2040

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

2041

WEXITSTATUS(status));

2042

free(direntry);

2043

continue;

2044

}

2045

} else if(WIFSIGNALED(status)){

2046

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

2047

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

2048

WTERMSIG(status));

2049

free(direntry);

2050

continue;

2051

} else {

2052

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

2053

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

2054

free(direntry);

2055

continue;

2056

}

2057

}

2058

if(debug){

2059

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

2060

direntry->d_name);

2061

}

2062

free(direntry);

2063

}

2064

free(direntries);

2065

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

2066

perror_plus("close");

2067

} else {

2068

hookdir_fd = -1;

2069

}

2070

close(devnull);

2071

}

2072

2073

__attribute__((nonnull, warn_unused_result))

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

2077

int ret;

2078

struct ifreq network;

2079

unsigned int if_index = if_nametoindex(interface);

2080

if(if_index == 0){

2081

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

2082

errno = old_errno;

2083

return ENXIO;

2084

}

2085

2086

if(quit_now){

2087

errno = old_errno;

2088

return EINTR;

2089

}

2090

2091

if(not interface_is_up(interface)){

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

2094

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

2095

ret_errno = errno;

2096

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

2097

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

2098

errno = old_errno;

2099

return ret_errno;

2100

}

2101

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

2102

2103

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

2104

if(sd == -1){

2105

ret_errno = errno;

2106

perror_plus("socket");

2107

errno = old_errno;

2108

return ret_errno;

2109

}

2110

2111

if(quit_now){

2112

ret = close(sd);

2113

if(ret == -1){

2114

perror_plus("close");

2115

}

2116

errno = old_errno;

2117

return EINTR;

2118

}

2119

2120

if(debug){

2121

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

2122

interface);

2123

}

2124

2125

/* Raise privileges */

2126

ret_errno = raise_privileges();

2127

if(ret_errno != 0){

2128

errno = ret_errno;

2129

perror_plus("Failed to raise privileges");

2130

}

2131

2132

#ifdef __linux__

2133

int ret_linux;

2134

bool restore_loglevel = false;

2135

if(ret_errno == 0){

2136

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2137

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

2138

ret_linux = klogctl(8, NULL, 5);

2139

if(ret_linux == -1){

2140

perror_plus("klogctl");

2141

} else {

2142

restore_loglevel = true;

2143

}

2144

}

2145

#endif /* __linux__ */

2146

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

2147

ioctl_errno = errno;

2148

#ifdef __linux__

2149

if(restore_loglevel){

2150

ret_linux = klogctl(7, NULL, 0);

2151

if(ret_linux == -1){

2152

perror_plus("klogctl");

2153

}

2154

}

2155

#endif /* __linux__ */

2156

2157

/* If raise_privileges() succeeded above */

2158

if(ret_errno == 0){

2159

/* Lower privileges */

2160

ret_errno = lower_privileges();

2161

if(ret_errno != 0){

2162

errno = ret_errno;

2163

perror_plus("Failed to lower privileges");

2164

}

2165

}

2166

2167

/* Close the socket */

2168

ret = close(sd);

2169

if(ret == -1){

2170

perror_plus("close");

2171

}

2172

2173

if(ret_setflags == -1){

2174

errno = ioctl_errno;

2175

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2176

errno = old_errno;

2177

return ioctl_errno;

2178

}

2179

} else if(debug){

2180

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

2181

interface);

2182

}

2183

2184

/* Sleep checking until interface is running.

2185

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

2186

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

2187

if(interface_is_running(interface)){

2188

break;

2189

}

2190

struct timespec sleeptime = { .tv_nsec = 250000000 };

2191

ret = nanosleep(&sleeptime, NULL);

2192

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

2193

perror_plus("nanosleep");

2194

}

2195

}

2196

2197

errno = old_errno;

2198

return 0;

2199

}

2200

2201

__attribute__((nonnull, warn_unused_result))

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

2204

struct ifreq network;

2205

unsigned int if_index = if_nametoindex(interface);

2206

if(if_index == 0){

2207

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

2208

errno = old_errno;

2209

return ENXIO;

2210

}

2211

if(interface_is_up(interface)){

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

2214

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

2215

ret_errno = errno;

2216

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

2217

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

2218

errno = old_errno;

2219

return ret_errno;

2220

}

2221

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

2222

2223

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

2224

if(sd == -1){

2225

ret_errno = errno;

2226

perror_plus("socket");

2227

errno = old_errno;

2228

return ret_errno;

2229

}

2230

2231

if(debug){

2232

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

2233

interface);

2234

}

2235

2236

/* Raise privileges */

2237

ret_errno = raise_privileges();

2238

if(ret_errno != 0){

2239

errno = ret_errno;

2240

perror_plus("Failed to raise privileges");

2241

}

2242

2243

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

2244

ioctl_errno = errno;

2245

2246

/* If raise_privileges() succeeded above */

2247

if(ret_errno == 0){

2248

/* Lower privileges */

2249

ret_errno = lower_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to lower privileges");

2253

}

2254

}

2255

2256

/* Close the socket */

2257

int ret = close(sd);

2258

if(ret == -1){

2259

perror_plus("close");

2260

}

2261

2262

if(ret_setflags == -1){

2263

errno = ioctl_errno;

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2265

errno = old_errno;

2266

return ioctl_errno;

2267

}

2268

} else if(debug){

2269

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

2270

interface);

2271

}

2272

2273

errno = old_errno;

2274

return 0;

2275

}

2276

2277

1416

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

2278

mandos_context mc = { .server = NULL, .dh_bits = 0,

2279

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

2280

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2281

.current_server = NULL, .interfaces = NULL,

2282

.interfaces_size = 0 };

2283

1417

AvahiSServiceBrowser *sb = NULL;

2284

error_t ret_errno;

1418

int error;

2285

1419

int ret;

2286

1420

intmax_t tmpmax;

2287

1421

char *tmp;

2288

1422

int exitcode = EXIT_SUCCESS;

2289

char *interfaces_to_take_down = NULL;

2290

size_t interfaces_to_take_down_size = 0;

2291

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

2292

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

2293

char *tempdir = NULL;

1423

const char *interface = "";

1424

struct ifreq network;

1425

int sd = -1;

1426

bool take_down_interface = false;

1427

uid_t uid;

1428

gid_t gid;

1429

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

1430

bool tempdir_created = false;

2294

1431

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2295

1432

const char *seckey = PATHDIR "/" SECKEY;

2296

1433

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

2298

char *interfaces_hooks = NULL;

2299

1434

2300

1435

bool gnutls_initialized = false;

2301

1436

bool gpgme_initialized = false;

2353

1488

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

2354

1489

" Diffie-Hellman key exchange",

2355

1490

.group = 2 },

2356

{ .name = "dh-params", .key = 134,

2357

.arg = "FILE",

2358

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2359

" for the Diffie-Hellman key exchange",

2360

.group = 2 },

2361

1491

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

2362

1492

.arg = "STRING",

2363

1493

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

2368

1498

.group = 2 },

2369

1499

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

2370

1500

.arg = "SECONDS",

2371

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

2372

.group = 2 },

2373

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

2374

.arg = "DIR",

2375

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

1501

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

2376

1502

.group = 2 },

2377

1503

/*

2378

1504

* These reproduce what we would get without ARGP_NO_HELP

2397

1523

connect_to = arg;

2398

1524

break;

2399

1525

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

2400

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

2401

arg, (int)',');

2402

if(ret_errno != 0){

2403

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

2404

}

1526

interface = arg;

2405

1527

break;

2406

1528

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

2407

1529

seckey = arg;

2418

1540

}

2419

1541

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

2420

1542

break;

2421

case 134: /* --dh-params */

2422

dh_params_file = arg;

2423

break;

2424

1543

case 130: /* --priority */

2425

1544

mc.priority = arg;

2426

1545

break;

2439

1558

argp_error(state, "Bad retry interval");

2440

1559

}

2441

1560

break;

2442

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

2443

hookdir = arg;

2444

break;

2445

1561

/*

2446

1562

* These reproduce what we would get without ARGP_NO_HELP

2447

1563

*/

2453

1569

argp_state_help(state, state->out_stream,

2454

1570

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2455

1571

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

2456

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

1572

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

2457

1573

exit(argp_err_exit_status);

2458

1574

break;

2459

1575

default:

2466

1582

.args_doc = "",

2467

1583

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

2468

1584

" passwords from a Mandos server" };

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

1585

ret = argp_parse(&argp, argc, argv,

1586

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1587

switch(ret){

2472

1588

case 0:

2473

1589

break;

2474

1590

case ENOMEM:

2475

1591

default:

2476

errno = ret_errno;

1592

errno = ret;

2477

1593

perror_plus("argp_parse");

2478

1594

exitcode = EX_OSERR;

2479

1595

goto end;

2482

1598

goto end;

2483

1599

}

2484

1600

}

2485

1601

2486

1602

{

2487

1603

/* Work around Debian bug #633582:

2488

1604

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

2489

2490

/* Re-raise privileges */

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2494

perror_plus("Failed to raise privileges");

2495

} else {

2496

struct stat st;

2497

2498

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

2499

int seckey_fd = open(seckey, O_RDONLY);

2500

if(seckey_fd == -1){

2501

perror_plus("open");

2502

} else {

2503

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

2504

if(ret == -1){

2505

perror_plus("fstat");

2506

} else {

2507

if(S_ISREG(st.st_mode)

2508

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

2509

ret = fchown(seckey_fd, uid, gid);

2510

if(ret == -1){

2511

perror_plus("fchown");

2512

}

2513

}

2514

}

2515

close(seckey_fd);

2516

}

2517

}

2518

2519

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

2520

int pubkey_fd = open(pubkey, O_RDONLY);

2521

if(pubkey_fd == -1){

2522

perror_plus("open");

2523

} else {

2524

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

2525

if(ret == -1){

2526

perror_plus("fstat");

2527

} else {

2528

if(S_ISREG(st.st_mode)

2529

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

2530

ret = fchown(pubkey_fd, uid, gid);

2531

if(ret == -1){

2532

perror_plus("fchown");

2533

}

2534

}

2535

}

2536

close(pubkey_fd);

2537

}

2538

}

2539

2540

if(dh_params_file != NULL

2541

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2542

int dhparams_fd = open(dh_params_file, O_RDONLY);

2543

if(dhparams_fd == -1){

2544

perror_plus("open");

2545

} else {

2546

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

2547

if(ret == -1){

2548

perror_plus("fstat");

2549

} else {

2550

if(S_ISREG(st.st_mode)

2551

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

2552

ret = fchown(dhparams_fd, uid, gid);

2553

if(ret == -1){

2554

perror_plus("fchown");

2555

}

2556

}

2557

}

2558

close(dhparams_fd);

2559

}

2560

}

2561

2562

/* Lower privileges */

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2566

perror_plus("Failed to lower privileges");

2567

}

2568

}

2569

}

2570

2571

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

2572

{

2573

char *interface = NULL;

2574

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

2575

interface))){

2576

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

2577

and if_nametoindex(interface) == 0){

2578

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

2579

fprintf_plus(stderr, "Not using nonexisting interface"

2580

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

2581

}

2582

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

2583

interface = NULL;

2584

}

2585

}

2586

}

2587

2588

/* Run network hooks */

2589

{

2590

if(mc.interfaces != NULL){

2591

interfaces_hooks = malloc(mc.interfaces_size);

2592

if(interfaces_hooks == NULL){

2593

perror_plus("malloc");

1605

struct stat st;

1606

1607

/* Re-raise priviliges */

1608

errno = 0;

1609

ret = seteuid(0);

1610

if(ret == -1){

1611

perror_plus("seteuid");

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

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

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

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

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

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

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1659

}

1660

}

1661

1662

/* Find network hooks and run them */

1663

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

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

1667

alphasort);

1668

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

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

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

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

setenv("VERBOSE", debug ? "1" : "0", 1);

1686

setenv("MODE", "start", 1);

1687

/* setenv( XXX more here */

1688

ret = execl(fullname, direntry->d_name, "start");

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

2594

1693

goto end;

2595

1694

}

2596

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

2597

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

2598

1695

}

2599

run_network_hooks("start", interfaces_hooks != NULL ?

2600

interfaces_hooks : "", delay);

1696

close(devnull);

2601

1697

}

2602

1698

2603

1699

if(not debug){

2604

1700

avahi_set_log_function(empty_log);

2605

1701

}

2606

1702

1703

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

1704

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1706

alphasort);

1707

if(ret >= 1){

1708

/* Pick the first good interface */

1709

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

1710

if(debug){

1711

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

1712

}

1713

if(interface == NULL){

1714

perror_plus("malloc");

1715

free(direntries);

1716

exitcode = EXIT_FAILURE;

1717

goto end;

1718

}

1719

free(direntries);

1720

} else {

1721

free(direntries);

1722

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

1723

exitcode = EXIT_FAILURE;

1724

goto end;

1725

}

1726

}

1727

2607

1728

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

2608

1729

from the signal handler */

2609

1730

/* Initialize the pseudo-RNG for Avahi */

2610

1731

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

2611

simple_poll = avahi_simple_poll_new();

2612

if(simple_poll == NULL){

2613

fprintf_plus(stderr,

2614

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

1732

mc.simple_poll = avahi_simple_poll_new();

1733

if(mc.simple_poll == NULL){

1734

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

2615

1735

exitcode = EX_UNAVAILABLE;

2616

1736

goto end;

2617

1737

}

2679

1799

}

2680

1800

}

2681

1801

2682

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

2683

if(mc.interfaces == NULL){

2684

struct dirent **direntries = NULL;

2685

/* Look for any good interfaces */

2686

ret = scandir(sys_class_net, &direntries, good_interface,

2687

alphasort);

2688

if(ret >= 1){

2689

/* Add all found interfaces to interfaces list */

2690

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

2691

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

2692

direntries[i]->d_name);

2693

if(ret_errno != 0){

2694

errno = ret_errno;

2695

perror_plus("argz_add");

2696

free(direntries[i]);

2697

continue;

2698

}

2699

if(debug){

2700

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

2701

direntries[i]->d_name);

2702

}

2703

free(direntries[i]);

2704

}

2705

free(direntries);

1802

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

1803

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

1804

if_index = (AvahiIfIndex) if_nametoindex(interface);

1805

if(if_index == 0){

1806

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

1807

exitcode = EX_UNAVAILABLE;

1808

goto end;

1809

}

1810

1811

if(quit_now){

1812

goto end;

1813

}

1814

1815

/* Re-raise priviliges */

1816

errno = 0;

1817

ret = seteuid(0);

1818

if(ret == -1){

1819

perror_plus("seteuid");

1820

}

1821

1822

#ifdef __linux__

1823

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1824

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

1825

ret = klogctl(8, NULL, 5);

1826

bool restore_loglevel = true;

1827

if(ret == -1){

1828

restore_loglevel = false;

1829

perror_plus("klogctl");

1830

}

1831

#endif /* __linux__ */

1832

1833

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1834

if(sd < 0){

1835

perror_plus("socket");

1836

exitcode = EX_OSERR;

1837

#ifdef __linux__

1838

if(restore_loglevel){

1839

ret = klogctl(7, NULL, 0);

1840

if(ret == -1){

1841

perror_plus("klogctl");

1842

}

1843

}

1844

#endif /* __linux__ */

1845

/* Lower privileges */

1846

errno = 0;

1847

ret = seteuid(uid);

1848

if(ret == -1){

1849

perror_plus("seteuid");

1850

}

1851

goto end;

1852

}

1853

strcpy(network.ifr_name, interface);

1854

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

1855

if(ret == -1){

1856

perror_plus("ioctl SIOCGIFFLAGS");

1857

#ifdef __linux__

1858

if(restore_loglevel){

1859

ret = klogctl(7, NULL, 0);

1860

if(ret == -1){

1861

perror_plus("klogctl");

1862

}

1863

}

1864

#endif /* __linux__ */

1865

exitcode = EX_OSERR;

1866

/* Lower privileges */

1867

errno = 0;

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

goto end;

1873

}

1874

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

1875

network.ifr_flags |= IFF_UP;

1876

take_down_interface = true;

1877

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

1878

if(ret == -1){

1879

take_down_interface = false;

1880

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1881

exitcode = EX_OSERR;

1882

#ifdef __linux__

1883

if(restore_loglevel){

1884

ret = klogctl(7, NULL, 0);

1885

if(ret == -1){

1886

perror_plus("klogctl");

1887

}

1888

}

1889

#endif /* __linux__ */

1890

/* Lower privileges */

1891

errno = 0;

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

goto end;

1897

}

1898

}

1899

/* Sleep checking until interface is running.

1900

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

1901

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

1902

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

1903

if(ret == -1){

1904

perror_plus("ioctl SIOCGIFFLAGS");

1905

} else if(network.ifr_flags & IFF_RUNNING){

1906

break;

1907

}

1908

struct timespec sleeptime = { .tv_nsec = 250000000 };

1909

ret = nanosleep(&sleeptime, NULL);

1910

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

1911

perror_plus("nanosleep");

1912

}

1913

}

1914

if(not take_down_interface){

1915

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

1916

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

1917

if(ret == -1){

1918

perror_plus("close");

1919

}

1920

}

1921

#ifdef __linux__

1922

if(restore_loglevel){

1923

/* Restores kernel loglevel to default */

1924

ret = klogctl(7, NULL, 0);

1925

if(ret == -1){

1926

perror_plus("klogctl");

1927

}

1928

}

1929

#endif /* __linux__ */

1930

/* Lower privileges */

1931

errno = 0;

1932

if(take_down_interface){

1933

/* Lower privileges */

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

2706

1938

} else {

2707

if(ret == 0){

2708

free(direntries);

2709

}

2710

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

2711

exitcode = EXIT_FAILURE;

2712

goto end;

2713

}

2714

}

2715

2716

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

2717

{

2718

char *interface = NULL;

2719

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

2720

interface))){

2721

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

2722

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

2723

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

2724

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

2725

interface);

2726

interface = NULL;

2727

while((interface = argz_next(mc.interfaces,

2728

mc.interfaces_size, interface))){

2729

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

2730

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

2731

interface);

2732

interface = NULL;

2733

}

2734

}

2735

break;

2736

}

2737

bool interface_was_up = interface_is_up(interface);

2738

errno = bring_up_interface(interface, delay);

2739

if(not interface_was_up){

2740

if(errno != 0){

2741

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2742

" %s\n", interface, strerror(errno));

2743

} else {

2744

errno = argz_add(&interfaces_to_take_down,

2745

&interfaces_to_take_down_size,

2746

interface);

2747

if(errno != 0){

2748

perror_plus("argz_add");

2749

}

2750

}

2751

}

2752

}

2753

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

2754

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

2755

}

2756

}

2757

2758

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

2759

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

2760

if(debug){

2761

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

2762

mc.interfaces);

2763

}

2764

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

1939

/* Lower privileges permanently */

1940

ret = setuid(uid);

1941

if(ret == -1){

1942

perror_plus("setuid");

1943

}

1944

}

2765

1945

}

2766

1946

2767

1947

if(quit_now){

2768

1948

goto end;

2769

1949

}

2770

1950

2771

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

1951

ret = init_gnutls_global(pubkey, seckey);

2772

1952

if(ret == -1){

2773

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

1953

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

2774

1954

exitcode = EX_UNAVAILABLE;

2775

1955

goto end;

2776

1956

} else {

2781

1961

goto end;

2782

1962

}

2783

1963

2784

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

2785

tempdir = mkdtemp(run_tempdir);

2786

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

2787

if(debug){

2788

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

2789

run_tempdir, old_tempdir);

2790

}

2791

tempdir = mkdtemp(old_tempdir);

2792

}

2793

if(tempdir == NULL){

1964

if(mkdtemp(tempdir) == NULL){

2794

1965

perror_plus("mkdtemp");

2795

1966

goto end;

2796

1967

}

1968

tempdir_created = true;

2797

1969

2798

1970

if(quit_now){

2799

1971

goto end;

2800

1972

}

2801

1973

2802

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

2803

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

1974

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

1975

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

2804

1976

exitcode = EX_UNAVAILABLE;

2805

1977

goto end;

2806

1978

} else {

2815

1987

/* Connect directly, do not use Zeroconf */

2816

1988

/* (Mainly meant for debugging) */

2817

1989

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

2818

2819

1990

if(address == NULL){

2820

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

1991

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

2821

1992

exitcode = EX_USAGE;

2822

1993

goto end;

2823

1994

}

2826

1997

goto end;

2827

1998

}

2828

1999

2829

in_port_t port;

2000

uint16_t port;

2830

2001

errno = 0;

2831

2002

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

2832

2003

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

2833

or tmpmax != (in_port_t)tmpmax){

2834

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

2004

or tmpmax != (uint16_t)tmpmax){

2005

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

2835

2006

exitcode = EX_USAGE;

2836

2007

goto end;

2837

2008

}

2838

2009

2839

2010

if(quit_now){

2840

2011

goto end;

2841

2012

}

2842

2013

2843

port = (in_port_t)tmpmax;

2014

port = (uint16_t)tmpmax;

2844

2015

*address = '\0';

2845

2016

/* Colon in address indicates IPv6 */

2846

2017

int af;

2862

2033

}

2863

2034

2864

2035

while(not quit_now){

2865

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

2866

&mc);

2036

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

2867

2037

if(quit_now or ret == 0){

2868

2038

break;

2869

2039

}

2870

2040

if(debug){

2871

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

2872

(int)retry_interval);

2041

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

2042

(int)retry_interval);

2873

2043

}

2874

sleep((unsigned int)retry_interval);

2044

sleep((int)retry_interval);

2875

2045

}

2876

2046

2877

if(not quit_now){

2047

if (not quit_now){

2878

2048

exitcode = EXIT_SUCCESS;

2879

2049

}

2880

2050

2895

2065

config.publish_domain = 0;

2896

2066

2897

2067

/* Allocate a new server */

2898

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2899

&config, NULL, NULL, &ret);

2068

mc.server = avahi_server_new(avahi_simple_poll_get

2069

(mc.simple_poll), &config, NULL,

2070

NULL, &error);

2900

2071

2901

2072

/* Free the Avahi configuration data */

2902

2073

avahi_server_config_free(&config);

2904

2075

2905

2076

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

2906

2077

if(mc.server == NULL){

2907

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

2908

avahi_strerror(ret));

2078

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

2079

avahi_strerror(error));

2909

2080

exitcode = EX_UNAVAILABLE;

2910

2081

goto end;

2911

2082

}

2917

2088

/* Create the Avahi service browser */

2918

2089

sb = avahi_s_service_browser_new(mc.server, if_index,

2919

2090

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2920

NULL, 0, browse_callback,

2921

(void *)&mc);

2091

NULL, 0, browse_callback, NULL);

2922

2092

if(sb == NULL){

2923

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

2924

avahi_strerror(avahi_server_errno(mc.server)));

2093

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

2094

avahi_strerror(avahi_server_errno(mc.server)));

2925

2095

exitcode = EX_UNAVAILABLE;

2926

2096

goto end;

2927

2097

}

2933

2103

/* Run the main loop */

2934

2104

2935

2105

if(debug){

2936

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

2106

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

2937

2107

}

2938

2939

ret = avahi_loop_with_timeout(simple_poll,

2940

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

2108

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

(int)(retry_interval * 1000));

2941

2111

if(debug){

2942

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

2943

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

2112

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

2113

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

2944

2114

}

2945

2115

2946

2116

end:

2947

2117

2948

2118

if(debug){

2949

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

2119

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

2950

2120

}

2951

2121

2952

2122

/* Cleanup things */

2953

free(mc.interfaces);

2954

2955

2123

if(sb != NULL)

2956

2124

avahi_s_service_browser_free(sb);

2957

2125

2958

2126

if(mc.server != NULL)

2959

2127

avahi_server_free(mc.server);

2960

2128

2961

if(simple_poll != NULL)

2962

avahi_simple_poll_free(simple_poll);

2129

if(mc.simple_poll != NULL)

2130

avahi_simple_poll_free(mc.simple_poll);

2963

2131

2964

2132

if(gnutls_initialized){

2965

2133

gnutls_certificate_free_credentials(mc.cred);

2134

gnutls_global_deinit();

2966

2135

gnutls_dh_params_deinit(mc.dh_params);

2967

2136

}

2968

2137

2969

2138

if(gpgme_initialized){

2970

2139

gpgme_release(mc.ctx);

2971

2140

}

2972

2141

2973

2142

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

2974

2143

has seen */

2975

2144

if(mc.current_server != NULL){

2976

2145

mc.current_server->prev->next = NULL;

2977

2146

while(mc.current_server != NULL){

2978

2147

server *next = mc.current_server->next;

2979

#ifdef __GNUC__

2980

#pragma GCC diagnostic push

2981

#pragma GCC diagnostic ignored "-Wcast-qual"

2982

#endif

2983

free((char *)(mc.current_server->ip));

2984

#ifdef __GNUC__

2985

#pragma GCC diagnostic pop

2986

#endif

2987

2148

free(mc.current_server);

2988

2149

mc.current_server = next;

2989

2150

}

2990

2151

}

2991

2152

2992

/* Re-raise privileges */

2993

{

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2997

perror_plus("Failed to raise privileges");

2998

} else {

2999

3000

/* Run network hooks */

3001

run_network_hooks("stop", interfaces_hooks != NULL ?

3002

interfaces_hooks : "", delay);

3003

3004

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

3005

{

3006

char *interface = NULL;

3007

while((interface=argz_next(interfaces_to_take_down,

3008

interfaces_to_take_down_size,

3009

interface))){

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

3013

perror_plus("Failed to take down interface");

3014

}

3015

}

3016

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

3017

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

3018

" down\n");

3019

}

3020

}

2153

/* XXX run network hooks "stop" here */

2154

2155

/* Take down the network interface */

2156

if(take_down_interface){

2157

/* Re-raise priviliges */

2158

errno = 0;

2159

ret = seteuid(0);

2160

if(ret == -1){

2161

perror_plus("seteuid");

3021

2162

}

3022

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

3026

perror_plus("Failed to lower privileges permanently");

2163

if(geteuid() == 0){

2164

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

2165

if(ret == -1){

2166

perror_plus("ioctl SIOCGIFFLAGS");

2167

} else if(network.ifr_flags & IFF_UP) {

2168

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

2169

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

2170

if(ret == -1){

2171

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2172

}

2173

}

2174

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

2175

if(ret == -1){

2176

perror_plus("close");

2177

}

2178

/* Lower privileges permanently */

2179

errno = 0;

2180

ret = setuid(uid);

2181

if(ret == -1){

2182

perror_plus("setuid");

2183

}

3027

2184

}

3028

2185

}

3029

2186

3030

free(interfaces_to_take_down);

3031

free(interfaces_hooks);

3032

3033

void clean_dir_at(int base, const char * const dirname,

3034

uintmax_t level){

2187

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

2188

if(tempdir_created){

3035

2189

struct dirent **direntries = NULL;

3036

int dret;

3037

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3038

O_RDONLY

3039

| O_NOFOLLOW

3040

| O_DIRECTORY

3041

| O_PATH));

3042

if(dir_fd == -1){

3043

perror_plus("open");

3044

}

3045

int numentries = scandirat(dir_fd, ".", &direntries,

3046

notdotentries, alphasort);

3047

if(numentries >= 0){

2190

struct dirent *direntry = NULL;

2191

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

2192

alphasort);

2193

if (numentries > 0){

3048

2194

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

3049

if(debug){

3050

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3051

dirname, direntries[i]->d_name);

3052

}

3053

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3054

if(dret == -1){

3055

if(errno == EISDIR){

3056

dret = unlinkat(dir_fd, direntries[i]->d_name,

3057

AT_REMOVEDIR);

3058

}

3059

if((dret == -1) and (errno == ENOTEMPTY)

3060

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3061

== 0) and (level == 0)){

3062

/* Recurse only in this special case */

3063

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3064

dret = 0;

3065

}

3066

if(dret == -1){

3067

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3068

direntries[i]->d_name, strerror(errno));

3069

}

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandirat");

3078

}

3079

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3080

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

3081

perror_plus("rmdir");

3082

}

3083

} else {

3084

perror_plus("scandirat");

3085

}

3086

close(dir_fd);

3087

}

3088

3089

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

3090

if(tempdir != NULL){

3091

clean_dir_at(-1, tempdir, 0);

2195

direntry = direntries[i];

2196

char *fullname = NULL;

2197

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

2198

direntry->d_name);

2199

if(ret < 0){

2200

perror_plus("asprintf");

2201

continue;

2202

}

2203

ret = remove(fullname);

2204

if(ret == -1){

2205

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

2206

strerror(errno));

2207

}

2208

free(fullname);

2209

}

2210

}

2211

2212

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

2213

free(direntries);

2214

if (numentries == -1){

2215

perror_plus("scandir");

2216

}

2217

ret = rmdir(tempdir);

2218

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

2219

perror_plus("rmdir");

2220

}

3092

2221

}

3093

2222

3094

2223

if(quit_now){