/mandos/release : revision 237.7.453

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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

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stdout, ferror(), remove() */

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

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stdout, ferror() */

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

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

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

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strtof(), abort() */

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

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

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

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

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asprintf(), strncpy(), strsignal()

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*/

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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() */

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

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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

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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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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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SIOCSIFFLAGS, if_indextoname(),

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*/

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

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

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setgid(), pause() */

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

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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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#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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123

init_gnutls_session(),

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124

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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153

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/* Doubly linked list that need to be circular linked when ever used */

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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166

typedef struct {

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AvahiSimplePoll *simple_poll;

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167

AvahiServer *server;

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168

gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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171

const char *priority;

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172

gpgme_ctx_t ctx;

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173

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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177

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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", .current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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180

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sig_atomic_t quit_now = 0;

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182

int signal_received = 0;

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183

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184

/* Function to use when printing errors */

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185

void perror_plus(const char *print_text){

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

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int e = errno;

187

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

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program_invocation_short_name);

189

errno = e;

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190

perror(print_text);

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191

}

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192

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

194

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

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va_list ap;

196

va_start (ap, format);

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

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program_invocation_short_name));

200

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

201

}

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/*

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

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

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206

* "buffer_length" is how much is already used.

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207

*/

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__attribute__((nonnull, warn_unused_result))

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209

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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211

if(buffer_length + BUFFER_SIZE > buffer_capacity){

178

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

179

if(buffer == NULL){

212

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

213

if(new_buf == NULL){

214

int old_errno = errno;

215

free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

181

219

}

220

*buffer = new_buf;

182

221

buffer_capacity += BUFFER_SIZE;

183

222

}

184

223

return buffer_capacity;

185

224

}

186

225

187

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

189

int af){

226

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

227

__attribute__((nonnull, warn_unused_result))

228

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

229

int af, server **current_server){

190

230

int ret;

191

231

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

192

232

if(new_server == NULL){

193

233

perror_plus("malloc");

194

return -1;

234

return false;

195

235

}

196

236

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

197

.port = port,

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.if_index = if_index,

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.af = af };

237

.port = port,

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.if_index = if_index,

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.af = af };

200

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if(new_server->ip == NULL){

201

241

perror_plus("strdup");

202

return -1;

203

}

204

/* uniqe case of first server */

205

if (mc.current_server == NULL){

242

free(new_server);

243

return false;

244

}

245

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

246

if(ret == -1){

247

perror_plus("clock_gettime");

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

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#ifdef __GNUC__

254

#pragma GCC diagnostic pop

255

#endif

256

free(new_server);

257

return false;

258

}

259

/* Special case of first server */

260

if(*current_server == NULL){

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261

new_server->next = new_server;

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262

new_server->prev = new_server;

208

mc.current_server = new_server;

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

263

*current_server = new_server;

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264

} else {

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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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/* 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->prev->next = new_server;

214

mc.current_server->prev = new_server;

215

}

216

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

217

if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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(*current_server)->prev = new_server;

270

}

271

return true;

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272

}

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/*

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* Initialize GPGME.

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276

*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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282

gpgme_error_t rc;

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283

gpgme_engine_info_t engine_info;

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284

232

233

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/*

234

286

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

235

287

*/

236

bool import_key(const char *filename){

288

bool import_key(const char * const filename){

237

289

int ret;

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290

int fd;

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291

gpgme_data_t pgp_data;

246

298

247

299

rc = gpgme_data_new_from_fd(&pgp_data, fd);

248

300

if(rc != GPG_ERR_NO_ERROR){

249

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

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gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

251

303

return false;

252

304

}

253

305

254

rc = gpgme_op_import(mc.ctx, pgp_data);

306

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

255

307

if(rc != GPG_ERR_NO_ERROR){

256

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

257

gpgme_strsource(rc), gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

258

310

return false;

259

311

}

260

312

261

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

313

ret = close(fd);

262

314

if(ret == -1){

263

315

perror_plus("close");

264

316

}

267

319

}

268

320

269

321

if(debug){

270

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

322

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

271

323

}

272

324

273

325

/* Init GPGME */

274

326

gpgme_check_version(NULL);

275

327

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

276

328

if(rc != GPG_ERR_NO_ERROR){

277

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

278

gpgme_strsource(rc), gpgme_strerror(rc));

329

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

330

gpgme_strsource(rc), gpgme_strerror(rc));

279

331

return false;

280

332

}

281

333

282

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

334

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

283

335

rc = gpgme_get_engine_info(&engine_info);

284

336

if(rc != GPG_ERR_NO_ERROR){

285

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

286

gpgme_strsource(rc), gpgme_strerror(rc));

337

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

338

gpgme_strsource(rc), gpgme_strerror(rc));

287

339

return false;

288

340

}

289

341

while(engine_info != NULL){

295

347

engine_info = engine_info->next;

296

348

}

297

349

if(engine_info == NULL){

298

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

350

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

351

tempdir);

299

352

return false;

300

353

}

301

354

302

355

/* Create new GPGME "context" */

303

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

356

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

304

357

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

358

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

359

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

360

gpgme_strerror(rc));

307

361

return false;

308

362

}

309

363

318

372

* Decrypt OpenPGP data.

319

373

* Returns -1 on error

320

374

*/

375

__attribute__((nonnull, warn_unused_result))

321

376

static ssize_t pgp_packet_decrypt(const char *cryptotext,

322

377

size_t crypto_size,

323

char **plaintext){

378

char **plaintext,

379

mandos_context *mc){

324

380

gpgme_data_t dh_crypto, dh_plain;

325

381

gpgme_error_t rc;

326

382

ssize_t ret;

328

384

ssize_t plaintext_length = 0;

329

385

330

386

if(debug){

331

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

387

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

332

388

}

333

389

334

390

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

335

391

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

336

392

0);

337

393

if(rc != GPG_ERR_NO_ERROR){

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

394

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

395

gpgme_strsource(rc), gpgme_strerror(rc));

340

396

return -1;

341

397

}

342

398

343

399

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

344

400

rc = gpgme_data_new(&dh_plain);

345

401

if(rc != GPG_ERR_NO_ERROR){

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

402

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

403

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

404

gpgme_strsource(rc), gpgme_strerror(rc));

348

405

gpgme_data_release(dh_crypto);

349

406

return -1;

350

407

}

351

408

352

409

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

353

410

data buffer */

354

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

411

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

355

412

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

413

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

414

gpgme_strsource(rc), gpgme_strerror(rc));

358

415

plaintext_length = -1;

359

416

if(debug){

360

417

gpgme_decrypt_result_t result;

361

result = gpgme_op_decrypt_result(mc.ctx);

418

result = gpgme_op_decrypt_result(mc->ctx);

362

419

if(result == NULL){

363

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

420

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

364

421

} else {

365

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

366

result->unsupported_algorithm);

367

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

368

result->wrong_key_usage);

422

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

423

result->unsupported_algorithm);

424

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

425

result->wrong_key_usage);

369

426

if(result->file_name != NULL){

370

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

427

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

371

428

}

372

429

gpgme_recipient_t recipient;

373

430

recipient = result->recipients;

374

431

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

432

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

433

gpgme_pubkey_algo_name

434

(recipient->pubkey_algo));

435

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

436

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

437

recipient->status == GPG_ERR_NO_SECKEY

438

? "No" : "Yes");

381

439

recipient = recipient->next;

382

440

}

383

441

}

386

444

}

387

445

388

446

if(debug){

389

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

447

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

390

448

}

391

449

392

450

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

399

457

*plaintext = NULL;

400

458

while(true){

401

459

plaintext_capacity = incbuffer(plaintext,

402

(size_t)plaintext_length,

403

plaintext_capacity);

460

(size_t)plaintext_length,

461

plaintext_capacity);

404

462

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

463

perror_plus("incbuffer");

464

plaintext_length = -1;

465

goto decrypt_end;

408

466

}

409

467

410

468

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

423

481

}

424

482

425

483

if(debug){

426

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

484

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

427

485

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

428

486

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

429

487

}

440

498

return plaintext_length;

441

499

}

442

500

443

static const char * safer_gnutls_strerror(int value){

444

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

445

-Wunreachable-code */

446

if(ret == NULL)

447

ret = "(unknown)";

448

return ret;

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

__attribute__((warn_unused_result))

509

static const char *safer_gnutls_strerror(int value){

510

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

449

512

}

450

513

451

514

/* GnuTLS log function callback */

515

__attribute__((nonnull))

452

516

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

453

517

const char* string){

454

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

518

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

455

519

}

456

520

521

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

457

522

static int init_gnutls_global(const char *pubkeyfilename,

458

const char *seckeyfilename){

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

mandos_context *mc){

459

526

int ret;

527

unsigned int uret;

460

528

461

529

if(debug){

462

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

463

}

464

465

ret = gnutls_global_init();

466

if(ret != GNUTLS_E_SUCCESS){

467

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

468

safer_gnutls_strerror(ret));

469

return -1;

530

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

470

531

}

471

532

472

533

if(debug){

478

539

}

479

540

480

541

/* OpenPGP credentials */

481

gnutls_certificate_allocate_credentials(&mc.cred);

542

ret = gnutls_certificate_allocate_credentials(&mc->cred);

482

543

if(ret != GNUTLS_E_SUCCESS){

483

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

484

from

485

-Wunreachable-code

486

*/

487

safer_gnutls_strerror(ret));

488

gnutls_global_deinit();

544

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

545

safer_gnutls_strerror(ret));

489

546

return -1;

490

547

}

491

548

492

549

if(debug){

493

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

494

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

495

seckeyfilename);

550

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

551

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

552

pubkeyfilename,

553

seckeyfilename);

496

554

}

497

555

498

556

ret = gnutls_certificate_set_openpgp_key_file

499

(mc.cred, pubkeyfilename, seckeyfilename,

557

(mc->cred, pubkeyfilename, seckeyfilename,

500

558

GNUTLS_OPENPGP_FMT_BASE64);

501

559

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

560

fprintf_plus(stderr,

561

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

562

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

563

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

564

safer_gnutls_strerror(ret));

507

565

goto globalfail;

508

566

}

509

567

510

568

/* GnuTLS server initialization */

511

ret = gnutls_dh_params_init(&mc.dh_params);

512

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

515

goto globalfail;

516

}

517

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

518

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

521

goto globalfail;

522

}

523

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

ret = gnutls_dh_params_init(&mc->dh_params);

570

if(ret != GNUTLS_E_SUCCESS){

571

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

572

" initialization: %s\n",

573

safer_gnutls_strerror(ret));

574

goto globalfail;

575

}

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

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

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

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

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

749

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

525

750

526

751

return 0;

527

752

528

753

globalfail:

529

754

530

gnutls_certificate_free_credentials(mc.cred);

531

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

755

gnutls_certificate_free_credentials(mc->cred);

756

gnutls_dh_params_deinit(mc->dh_params);

533

757

return -1;

534

758

}

535

759

536

static int init_gnutls_session(gnutls_session_t *session){

760

__attribute__((nonnull, warn_unused_result))

761

static int init_gnutls_session(gnutls_session_t *session,

762

mandos_context *mc){

537

763

int ret;

538

764

/* GnuTLS session creation */

539

765

do {

543

769

}

544

770

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

545

771

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

772

fprintf_plus(stderr,

773

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

774

safer_gnutls_strerror(ret));

548

775

}

549

776

550

777

{

551

778

const char *err;

552

779

do {

553

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

780

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

554

781

if(quit_now){

555

782

gnutls_deinit(*session);

556

783

return -1;

557

784

}

558

785

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

559

786

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

787

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

788

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

789

safer_gnutls_strerror(ret));

563

790

gnutls_deinit(*session);

564

791

return -1;

565

792

}

567

794

568

795

do {

569

796

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

797

mc->cred);

571

798

if(quit_now){

572

799

gnutls_deinit(*session);

573

800

return -1;

574

801

}

575

802

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

576

803

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

804

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

805

safer_gnutls_strerror(ret));

579

806

gnutls_deinit(*session);

580

807

return -1;

581

808

}

583

810

/* ignore client certificate if any. */

584

811

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

585

812

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

588

813

return 0;

589

814

}

590

815

592

817

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

593

818

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

594

819

820

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

821

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

825

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

826

ret = errno;

827

}

828

errno = old_errno;

829

return ret;

830

}

831

832

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

833

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

838

errno = old_errno;

839

return ret;

840

}

841

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

842

ret = errno;

843

}

844

errno = old_errno;

845

return ret;

846

}

847

848

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

849

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

853

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

854

ret = errno;

855

}

856

errno = old_errno;

857

return ret;

858

}

859

860

/* Lower privileges permanently */

861

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

865

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

866

ret = errno;

867

}

868

errno = old_errno;

869

return ret;

870

}

871

872

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

873

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

875

const char *address,

876

AvahiIfIndex if_index){

877

int ret;

878

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

879

char add_arg[] = "add";

880

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

if(pluginhelperdir == NULL){

884

if(debug){

885

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

886

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

887

}

888

return false;

889

}

890

891

char interface[IF_NAMESIZE];

892

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

893

perror_plus("if_indextoname");

894

return false;

895

}

896

897

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

898

if(devnull == -1){

899

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

900

return false;

901

}

902

pid_t pid = fork();

903

if(pid == 0){

904

/* Child */

905

/* Raise privileges */

906

errno = raise_privileges_permanently();

907

if(errno != 0){

908

perror_plus("Failed to raise privileges");

909

/* _exit(EX_NOPERM); */

910

} else {

911

/* Set group */

912

errno = 0;

913

ret = setgid(0);

914

if(ret == -1){

915

perror_plus("setgid");

916

_exit(EX_NOPERM);

917

}

918

/* Reset supplementary groups */

919

errno = 0;

920

ret = setgroups(0, NULL);

921

if(ret == -1){

922

perror_plus("setgroups");

923

_exit(EX_NOPERM);

924

}

925

}

926

ret = dup2(devnull, STDIN_FILENO);

927

if(ret == -1){

928

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

929

_exit(EX_OSERR);

930

}

931

ret = close(devnull);

932

if(ret == -1){

933

perror_plus("close");

934

_exit(EX_OSERR);

935

}

936

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

937

if(ret == -1){

938

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

939

_exit(EX_OSERR);

940

}

941

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

942

O_RDONLY

943

| O_DIRECTORY

944

| O_PATH

945

| O_CLOEXEC));

946

if(helperdir_fd == -1){

947

perror_plus("open");

948

_exit(EX_UNAVAILABLE);

949

}

950

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

951

helper, O_RDONLY));

952

if(helper_fd == -1){

953

perror_plus("openat");

954

close(helperdir_fd);

955

_exit(EX_UNAVAILABLE);

956

}

957

close(helperdir_fd);

958

#ifdef __GNUC__

959

#pragma GCC diagnostic push

960

#pragma GCC diagnostic ignored "-Wcast-qual"

961

#endif

962

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

963

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

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

966

#ifdef __GNUC__

967

#pragma GCC diagnostic pop

968

#endif

969

perror_plus("fexecve");

970

_exit(EXIT_FAILURE);

971

}

972

}

973

if(pid == -1){

974

perror_plus("fork");

975

return false;

976

}

977

int status;

978

pid_t pret = -1;

979

errno = 0;

980

do {

981

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

982

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

983

int errno_raising = 0;

984

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

985

errno_raising = errno;

986

perror_plus("Failed to raise privileges in order to"

987

" kill helper program");

988

}

989

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

990

perror_plus("kill");

991

}

992

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

993

perror_plus("Failed to lower privileges after killing"

994

" helper program");

995

}

996

return false;

997

}

998

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

999

if(pret == -1){

1000

perror_plus("waitpid");

1001

return false;

1002

}

1003

if(WIFEXITED(status)){

1004

if(WEXITSTATUS(status) != 0){

1005

fprintf_plus(stderr, "Error: iprouteadddel exited"

1006

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

1007

return false;

1008

}

1009

return true;

1010

}

1011

if(WIFSIGNALED(status)){

1012

fprintf_plus(stderr, "Error: iprouteadddel died by"

1013

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

1014

return false;

1015

}

1016

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

1017

return false;

1018

}

1019

1020

__attribute__((nonnull, warn_unused_result))

1021

static bool add_local_route(const char *address,

1022

AvahiIfIndex if_index){

1023

if(debug){

1024

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

1025

}

1026

return add_delete_local_route(true, address, if_index);

1027

}

1028

1029

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

1031

AvahiIfIndex if_index){

1032

if(debug){

1033

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

1034

}

1035

return add_delete_local_route(false, address, if_index);

1036

}

1037

595

1038

/* Called when a Mandos server is found */

596

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

1039

__attribute__((nonnull, warn_unused_result))

1040

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

597

1041

AvahiIfIndex if_index,

598

int af){

1042

int af, mandos_context *mc){

599

1043

int ret, tcp_sd = -1;

600

1044

ssize_t sret;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

1045

struct sockaddr_storage to;

605

1046

char *buffer = NULL;

606

1047

char *decrypted_buffer = NULL;

607

1048

size_t buffer_length = 0;

610

1051

int retval = -1;

611

1052

gnutls_session_t session;

612

1053

int pf; /* Protocol family */

1054

bool route_added = false;

613

1055

614

1056

errno = 0;

615

1057

626

1068

pf = PF_INET;

627

1069

break;

628

1070

default:

629

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

1071

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

630

1072

errno = EINVAL;

631

1073

return -1;

632

1074

}

633

1075

634

ret = init_gnutls_session(&session);

1076

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

1077

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

1078

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

1079

bool match = false;

1080

{

1081

char *interface = NULL;

1082

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

1083

mc->interfaces_size,

1084

interface))){

1085

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

1086

match = true;

1087

break;

1088

}

1089

}

1090

}

1091

if(not match){

1092

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

1093

connect to the server */

1094

if(debug){

1095

char interface[IF_NAMESIZE];

1096

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

1097

perror_plus("if_indextoname");

1098

} else {

1099

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

1100

" \"%s\"\n",

1101

if_indextoname((unsigned int)if_index,

1102

interface));

1103

}

1104

}

1105

return -1;

1106

}

1107

}

1108

1109

ret = init_gnutls_session(&session, mc);

635

1110

if(ret != 0){

636

1111

return -1;

637

1112

}

638

1113

639

1114

if(debug){

640

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

641

"\n", ip, port);

1115

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

1116

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

642

1117

}

643

1118

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

1119

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

645

1120

if(tcp_sd < 0){

646

1121

int e = errno;

647

1122

perror_plus("socket");

654

1129

goto mandos_end;

655

1130

}

656

1131

657

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

658

1132

if(af == AF_INET6){

659

to.in6.sin6_family = (sa_family_t)af;

660

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

1133

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

1134

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

1135

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

661

1136

} else { /* IPv4 */

662

to.in.sin_family = (sa_family_t)af;

663

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

1137

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

1138

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

1139

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

664

1140

}

665

1141

if(ret < 0 ){

666

1142

int e = errno;

670

1146

}

671

1147

if(ret == 0){

672

1148

int e = errno;

673

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

1149

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

674

1150

errno = e;

675

1151

goto mandos_end;

676

1152

}

677

1153

if(af == AF_INET6){

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

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

684

-Wunreachable-code*/

1154

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

1155

if(IN6_IS_ADDR_LINKLOCAL

1156

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

685

1157

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

1158

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

1159

" incomplete without a network interface\n");

688

1160

errno = EINVAL;

689

1161

goto mandos_end;

690

1162

}

691

1163

/* Set the network interface number as scope */

692

to.in6.sin6_scope_id = (uint32_t)if_index;

1164

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

693

1165

}

694

1166

} else {

695

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

696

-Wconversion and

697

-Wunreachable-code */

1167

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

698

1168

}

699

1169

700

1170

if(quit_now){

708

1178

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

709

1179

perror_plus("if_indextoname");

710

1180

} else {

711

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

712

ip, interface, port);

1181

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

1182

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

713

1183

}

714

1184

} else {

715

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

716

port);

1185

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

1186

ip, (uintmax_t)port);

717

1187

}

718

1188

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

1189

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

720

const char *pcret;

721

if(af == AF_INET6){

722

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

723

sizeof(addrstr));

724

} else {

725

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

726

sizeof(addrstr));

727

}

728

if(pcret == NULL){

729

perror_plus("inet_ntop");

730

} else {

731

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

732

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

733

}

734

}

735

}

736

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

if(af == AF_INET6){

743

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

744

} else {

745

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

746

}

747

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

753

goto mandos_end;

754

}

755

756

if(quit_now){

757

errno = EINTR;

758

goto mandos_end;

1190

if(af == AF_INET6){

1191

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

1192

sizeof(struct sockaddr_in6),

1193

addrstr, sizeof(addrstr), NULL, 0,

1194

NI_NUMERICHOST);

1195

} else {

1196

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

1197

sizeof(struct sockaddr_in),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

}

1201

if(ret == EAI_SYSTEM){

1202

perror_plus("getnameinfo");

1203

} else if(ret != 0) {

1204

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

1205

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

1206

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

1207

}

1208

}

1209

1210

if(quit_now){

1211

errno = EINTR;

1212

goto mandos_end;

1213

}

1214

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

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

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

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

1234

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

1235

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

1236

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

1237

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

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

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

1241

1242

Avahi bug reference:

1243

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

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

759

1270

}

760

1271

761

1272

const char *out = mandos_protocol_version;

763

1274

while(true){

764

1275

size_t out_size = strlen(out);

765

1276

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

766

out_size - written));

1277

out_size - written));

767

1278

if(ret == -1){

768

1279

int e = errno;

769

1280

perror_plus("write");

789

1300

}

790

1301

791

1302

if(debug){

792

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

1303

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

793

1304

}

794

1305

795

1306

if(quit_now){

796

1307

errno = EINTR;

797

1308

goto mandos_end;

798

1309

}

799

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1310

1311

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

1312

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

1313

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

1314

gnutls_transport_set_ptr(session,

1315

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

1316

803

1317

if(quit_now){

804

1318

errno = EINTR;

815

1329

816

1330

if(ret != GNUTLS_E_SUCCESS){

817

1331

if(debug){

818

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

1332

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

819

1333

gnutls_perror(ret);

820

1334

}

821

1335

errno = EPROTO;

825

1339

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

826

1340

827

1341

if(debug){

828

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

829

ip);

1342

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1343

" %s\n", ip);

830

1344

}

831

1345

832

1346

while(true){

837

1351

}

838

1352

839

1353

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

1354

buffer_capacity);

841

1355

if(buffer_capacity == 0){

842

1356

int e = errno;

843

1357

perror_plus("incbuffer");

870

1384

}

871

1385

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

872

1386

if(ret < 0){

873

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

1387

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

1388

"***\n");

874

1389

gnutls_perror(ret);

875

1390

errno = EPROTO;

876

1391

goto mandos_end;

877

1392

}

878

1393

break;

879

1394

default:

880

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

881

" encrypted session with Mandos server\n");

1395

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

1396

" encrypted session with Mandos server\n");

882

1397

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

1398

errno = EIO;

884

1399

goto mandos_end;

889

1404

}

890

1405

891

1406

if(debug){

892

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

1407

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

893

1408

}

894

1409

895

1410

if(quit_now){

907

1422

908

1423

if(buffer_length > 0){

909

1424

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

1425

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1426

&decrypted_buffer, mc);

913

1427

if(decrypted_buffer_size >= 0){

914

1428

1429

clearerr(stdout);

915

1430

written = 0;

916

1431

while(written < (size_t) decrypted_buffer_size){

917

1432

if(quit_now){

925

1440

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

926

1441

int e = errno;

927

1442

if(debug){

928

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

929

strerror(errno));

1443

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

1444

strerror(errno));

930

1445

}

931

1446

errno = e;

932

1447

goto mandos_end;

933

1448

}

934

1449

written += (size_t)ret;

935

1450

}

1451

ret = fflush(stdout);

1452

if(ret != 0){

1453

int e = errno;

1454

if(debug){

1455

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

1456

strerror(errno));

1457

}

1458

errno = e;

1459

goto mandos_end;

1460

}

936

1461

retval = 0;

937

1462

}

938

1463

}

941

1466

942

1467

mandos_end:

943

1468

{

1469

if(route_added){

1470

if(not delete_local_route(ip, if_index)){

1471

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

1472

" interface %d", ip, if_index);

1473

}

1474

}

944

1475

int e = errno;

945

1476

free(decrypted_buffer);

946

1477

free(buffer);

947

1478

if(tcp_sd >= 0){

948

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

1479

ret = close(tcp_sd);

949

1480

}

950

1481

if(ret == -1){

951

1482

if(e == 0){

976

1507

AVAHI_GCC_UNUSED AvahiStringList *txt,

977

1508

AVAHI_GCC_UNUSED AvahiLookupResultFlags

978

1509

flags,

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1510

void *mc){

1511

if(r == NULL){

1512

return;

1513

}

981

1514

982

1515

/* Called whenever a service has been resolved successfully or

983

1516

timed out */

984

1517

985

1518

if(quit_now){

1519

avahi_s_service_resolver_free(r);

986

1520

return;

987

1521

}

988

1522

989

1523

switch(event){

990

1524

default:

991

1525

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1526

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

1527

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

1528

domain,

1529

avahi_strerror(avahi_server_errno

1530

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

995

1531

break;

996

1532

997

1533

case AVAHI_RESOLVER_FOUND:

999

1535

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1536

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

1001

1537

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1538

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

1539

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

1540

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

1005

1541

}

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1542

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

1543

interface,

1544

avahi_proto_to_af(proto),

1545

mc);

1008

1546

if(ret == 0){

1009

avahi_simple_poll_quit(mc.simple_poll);

1547

avahi_simple_poll_quit(simple_poll);

1010

1548

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1549

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

1550

avahi_proto_to_af(proto),

1551

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

1552

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

1553

" list\n", name);

1554

}

1013

1555

}

1014

1556

}

1015

1557

}

1025

1567

const char *domain,

1026

1568

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1027

1569

flags,

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1570

void *mc){

1571

if(b == NULL){

1572

return;

1573

}

1030

1574

1031

1575

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

1032

1576

is removed from the LAN */

1039

1583

default:

1040

1584

case AVAHI_BROWSER_FAILURE:

1041

1585

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1586

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

1587

avahi_strerror(avahi_server_errno

1588

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

1589

avahi_simple_poll_quit(simple_poll);

1045

1590

return;

1046

1591

1047

1592

case AVAHI_BROWSER_NEW:

1050

1595

the callback function is called the Avahi server will free the

1051

1596

resolver for us. */

1052

1597

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

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

1057

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

1598

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

1599

interface, protocol, name, type,

1600

domain, protocol, 0,

1601

resolve_callback, mc) == NULL)

1602

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

1603

" %s\n", name,

1604

avahi_strerror(avahi_server_errno

1605

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

1058

1606

break;

1059

1607

1060

1608

case AVAHI_BROWSER_REMOVE:

1063

1611

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1612

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1613

if(debug){

1066

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

1614

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

1615

" searching...\n");

1067

1616

}

1068

1617

break;

1069

1618

}

1070

1619

}

1071

1620

1072

/* Signal handler that stops main loop after sigterm has been called */

1621

/* Signal handler that stops main loop after SIGTERM */

1073

1622

static void handle_sigterm(int sig){

1074

1623

if(quit_now){

1075

1624

return;

1078

1627

signal_received = sig;

1079

1628

int old_errno = errno;

1080

1629

/* set main loop to exit */

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1630

if(simple_poll != NULL){

1631

avahi_simple_poll_quit(simple_poll);

1083

1632

}

1084

1633

errno = old_errno;

1085

1634

}

1086

1635

1636

__attribute__((nonnull, warn_unused_result))

1637

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

1638

int ret;

1639

int old_errno;

1640

1641

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

1642

if(s < 0){

1643

old_errno = errno;

1644

perror_plus("socket");

1645

errno = old_errno;

1646

return false;

1647

}

1648

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

1649

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

1650

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1651

if(ret == -1){

1652

if(debug){

1653

old_errno = errno;

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

errno = old_errno;

1656

}

1657

return false;

1658

}

1659

return true;

1660

}

1661

1662

__attribute__((nonnull, warn_unused_result))

1663

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

1664

1665

/* Reject the loopback device */

1666

if(ifr->ifr_flags & IFF_LOOPBACK){

1667

if(debug){

1668

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

1669

ifname);

1670

}

1671

return false;

1672

}

1673

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

1674

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

1675

if(debug){

1676

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

1677

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

1678

}

1679

return true;

1680

}

1681

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

1682

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

1683

if(debug){

1684

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1685

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

1686

}

1687

return false;

1688

}

1689

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

1690

if(ifr->ifr_flags & IFF_NOARP){

1691

if(debug){

1692

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

1693

ifname);

1694

}

1695

return false;

1696

}

1697

1698

/* Accept this device */

1699

if(debug){

1700

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

1701

}

1702

return true;

1703

}

1704

1087

1705

/*

1088

1706

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

1089

1707

* corresponds to an acceptable network device.

1090

1708

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

1091

1709

*/

1710

__attribute__((nonnull, warn_unused_result))

1092

1711

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

1712

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

1096

1713

return 0;

1097

1714

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1715

1716

struct ifreq ifr;

1717

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

1718

if(debug){

1719

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

1720

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

1721

}

1722

return 0;

1723

}

1724

1725

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

1726

return 0;

1188

1727

}

1189

1728

return 1;

1190

1729

}

1191

1730

1731

/*

1732

* This function determines if a network interface is up.

1733

*/

1734

__attribute__((nonnull, warn_unused_result))

1735

bool interface_is_up(const char *interface){

1736

struct ifreq ifr;

1737

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

1738

if(debug){

1739

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

1740

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

1741

}

1742

return false;

1743

}

1744

1745

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

1746

}

1747

1748

/*

1749

* This function determines if a network interface is running

1750

*/

1751

__attribute__((nonnull, warn_unused_result))

1752

bool interface_is_running(const char *interface){

1753

struct ifreq ifr;

1754

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

1755

if(debug){

1756

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

1757

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

1758

}

1759

return false;

1760

}

1761

1762

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

1763

}

1764

1765

__attribute__((nonnull, pure, warn_unused_result))

1192

1766

int notdotentries(const struct dirent *direntry){

1193

1767

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

1194

1768

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

1200

1774

return 1;

1201

1775

}

1202

1776

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1777

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

1778

__attribute__((nonnull, warn_unused_result))

1779

int runnable_hook(const struct dirent *direntry){

1780

int ret;

1781

size_t sret;

1782

struct stat st;

1783

1784

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

1785

/* Empty name? */

1786

return 0;

1787

}

1788

1789

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

1790

"abcdefghijklmnopqrstuvwxyz"

1791

"0123456789"

1792

"_.-");

1793

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

1794

/* Contains non-allowed characters */

1795

if(debug){

1796

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

1797

direntry->d_name);

1798

}

1799

return 0;

1800

}

1801

1802

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

1803

if(ret == -1){

1804

if(debug){

1805

perror_plus("Could not stat hook");

1806

}

1807

return 0;

1808

}

1809

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

1810

/* Not a regular file */

1811

if(debug){

1812

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

1813

direntry->d_name);

1814

}

1815

return 0;

1816

}

1817

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

1818

/* Not executable */

1819

if(debug){

1820

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

1821

direntry->d_name);

1822

}

1823

return 0;

1824

}

1825

if(debug){

1826

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

1827

direntry->d_name);

1828

}

1829

return 1;

1830

}

1831

1832

__attribute__((nonnull, warn_unused_result))

1833

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1834

mandos_context *mc){

1204

1835

int ret;

1205

1836

struct timespec now;

1206

1837

struct timespec waited_time;

1207

1838

intmax_t block_time;

1208

1839

1209

1840

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr, "Wait until first server is found. No timeout!\n");

1841

if(mc->current_server == NULL){

1842

if(debug){

1843

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

1844

" No timeout!\n");

1213

1845

}

1214

1846

ret = avahi_simple_poll_iterate(s, -1);

1215

1847

} else {

1216

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1848

if(debug){

1849

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

1850

" it, or wait\n");

1218

1851

}

1219

1852

/* the current time */

1220

1853

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

1857

}

1225

1858

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

1226

1859

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1232

if (debug){

1233

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

1860

waited_time.tv_sec = (now.tv_sec

1861

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

1862

waited_time.tv_nsec = (now.tv_nsec

1863

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

1864

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

1865

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

1866

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

1867

block_time = ((retry_interval

1868

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

1869

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

1870

1871

if(debug){

1872

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

1873

block_time);

1234

1874

}

1235

1875

1236

1876

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1877

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

1878

mc->current_server->port,

1879

mc->current_server->if_index,

1880

mc->current_server->af, mc);

1241

1881

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1882

avahi_simple_poll_quit(s);

1243

1883

return 0;

1244

1884

}

1245

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

1885

ret = clock_gettime(CLOCK_MONOTONIC,

1886

&mc->current_server->last_seen);

1246

1887

if(ret == -1){

1247

1888

perror_plus("clock_gettime");

1248

1889

return -1;

1249

1890

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1891

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

1892

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

1893

servers, but don't block */

1252

1894

}

1253

1895

1254

1896

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

1255

1897

}

1256

1898

if(ret != 0){

1257

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

1899

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

1258

1900

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

1259

1901

}

1260

1902

}

1261

1903

}

1262

1904

}

1263

1905

1906

__attribute__((nonnull))

1907

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

1908

const float delay){

1909

struct dirent **direntries = NULL;

1910

if(hookdir_fd == -1){

1911

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1912

| O_CLOEXEC);

1913

if(hookdir_fd == -1){

1914

if(errno == ENOENT){

1915

if(debug){

1916

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

1917

" found\n", hookdir);

1918

}

1919

} else {

1920

perror_plus("open");

1921

}

1922

return;

1923

}

1924

}

1925

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

1926

runnable_hook, alphasort);

1927

if(numhooks == -1){

1928

perror_plus("scandir");

1929

return;

1930

}

1931

struct dirent *direntry;

1932

int ret;

1933

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

1934

if(devnull == -1){

1935

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

1936

return;

1937

}

1938

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

1939

direntry = direntries[i];

1940

if(debug){

1941

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

1942

direntry->d_name);

1943

}

1944

pid_t hook_pid = fork();

1945

if(hook_pid == 0){

1946

/* Child */

1947

/* Raise privileges */

1948

errno = raise_privileges_permanently();

1949

if(errno != 0){

1950

perror_plus("Failed to raise privileges");

1951

_exit(EX_NOPERM);

1952

}

1953

/* Set group */

1954

errno = 0;

1955

ret = setgid(0);

1956

if(ret == -1){

1957

perror_plus("setgid");

1958

_exit(EX_NOPERM);

1959

}

1960

/* Reset supplementary groups */

1961

errno = 0;

1962

ret = setgroups(0, NULL);

1963

if(ret == -1){

1964

perror_plus("setgroups");

1965

_exit(EX_NOPERM);

1966

}

1967

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

1968

if(ret == -1){

1969

perror_plus("setenv");

1970

_exit(EX_OSERR);

1971

}

1972

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

1973

if(ret == -1){

1974

perror_plus("setenv");

1975

_exit(EX_OSERR);

1976

}

1977

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

1978

if(ret == -1){

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

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

1983

if(ret == -1){

1984

perror_plus("setenv");

1985

_exit(EX_OSERR);

1986

}

1987

char *delaystring;

1988

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

1989

if(ret == -1){

1990

perror_plus("asprintf");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

free(delaystring);

1996

perror_plus("setenv");

1997

_exit(EX_OSERR);

1998

}

1999

free(delaystring);

2000

if(connect_to != NULL){

2001

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

2002

if(ret == -1){

2003

perror_plus("setenv");

2004

_exit(EX_OSERR);

2005

}

2006

}

2007

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

2008

direntry->d_name,

2009

O_RDONLY));

2010

if(hook_fd == -1){

2011

perror_plus("openat");

2012

_exit(EXIT_FAILURE);

2013

}

2014

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

2015

perror_plus("close");

2016

_exit(EXIT_FAILURE);

2017

}

2018

ret = dup2(devnull, STDIN_FILENO);

2019

if(ret == -1){

2020

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

2021

_exit(EX_OSERR);

2022

}

2023

ret = close(devnull);

2024

if(ret == -1){

2025

perror_plus("close");

2026

_exit(EX_OSERR);

2027

}

2028

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2029

if(ret == -1){

2030

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

2031

_exit(EX_OSERR);

2032

}

2033

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

2034

environ) == -1){

2035

perror_plus("fexecve");

2036

_exit(EXIT_FAILURE);

2037

}

2038

} else {

2039

if(hook_pid == -1){

2040

perror_plus("fork");

2041

free(direntry);

2042

continue;

2043

}

2044

int status;

2045

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

2046

perror_plus("waitpid");

2047

free(direntry);

2048

continue;

2049

}

2050

if(WIFEXITED(status)){

2051

if(WEXITSTATUS(status) != 0){

2052

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

2053

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

2054

WEXITSTATUS(status));

2055

free(direntry);

2056

continue;

2057

}

2058

} else if(WIFSIGNALED(status)){

2059

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

2060

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

2061

WTERMSIG(status));

2062

free(direntry);

2063

continue;

2064

} else {

2065

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

2066

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

2067

free(direntry);

2068

continue;

2069

}

2070

}

2071

if(debug){

2072

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

2073

direntry->d_name);

2074

}

2075

free(direntry);

2076

}

2077

free(direntries);

2078

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

2079

perror_plus("close");

2080

} else {

2081

hookdir_fd = -1;

2082

}

2083

close(devnull);

2084

}

2085

2086

__attribute__((nonnull, warn_unused_result))

2087

int bring_up_interface(const char *const interface,

2088

const float delay){

2089

int old_errno = errno;

2090

int ret;

2091

struct ifreq network;

2092

unsigned int if_index = if_nametoindex(interface);

2093

if(if_index == 0){

2094

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

2095

errno = old_errno;

2096

return ENXIO;

2097

}

2098

2099

if(quit_now){

2100

errno = old_errno;

2101

return EINTR;

2102

}

2103

2104

if(not interface_is_up(interface)){

2105

int ret_errno = 0;

2106

int ioctl_errno = 0;

2107

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

2108

ret_errno = errno;

2109

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

2110

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

2111

errno = old_errno;

2112

return ret_errno;

2113

}

2114

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

2115

2116

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

2117

if(sd == -1){

2118

ret_errno = errno;

2119

perror_plus("socket");

2120

errno = old_errno;

2121

return ret_errno;

2122

}

2123

2124

if(quit_now){

2125

ret = close(sd);

2126

if(ret == -1){

2127

perror_plus("close");

2128

}

2129

errno = old_errno;

2130

return EINTR;

2131

}

2132

2133

if(debug){

2134

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

2135

interface);

2136

}

2137

2138

/* Raise privileges */

2139

ret_errno = raise_privileges();

2140

if(ret_errno != 0){

2141

errno = ret_errno;

2142

perror_plus("Failed to raise privileges");

2143

}

2144

2145

#ifdef __linux__

2146

int ret_linux;

2147

bool restore_loglevel = false;

2148

if(ret_errno == 0){

2149

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2150

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

2151

ret_linux = klogctl(8, NULL, 5);

2152

if(ret_linux == -1){

2153

perror_plus("klogctl");

2154

} else {

2155

restore_loglevel = true;

2156

}

2157

}

2158

#endif /* __linux__ */

2159

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

2160

ioctl_errno = errno;

2161

#ifdef __linux__

2162

if(restore_loglevel){

2163

ret_linux = klogctl(7, NULL, 0);

2164

if(ret_linux == -1){

2165

perror_plus("klogctl");

2166

}

2167

}

2168

#endif /* __linux__ */

2169

2170

/* If raise_privileges() succeeded above */

2171

if(ret_errno == 0){

2172

/* Lower privileges */

2173

ret_errno = lower_privileges();

2174

if(ret_errno != 0){

2175

errno = ret_errno;

2176

perror_plus("Failed to lower privileges");

2177

}

2178

}

2179

2180

/* Close the socket */

2181

ret = close(sd);

2182

if(ret == -1){

2183

perror_plus("close");

2184

}

2185

2186

if(ret_setflags == -1){

2187

errno = ioctl_errno;

2188

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2189

errno = old_errno;

2190

return ioctl_errno;

2191

}

2192

} else if(debug){

2193

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

2194

interface);

2195

}

2196

2197

/* Sleep checking until interface is running.

2198

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

2199

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

2200

if(interface_is_running(interface)){

2201

break;

2202

}

2203

struct timespec sleeptime = { .tv_nsec = 250000000 };

2204

ret = nanosleep(&sleeptime, NULL);

2205

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

2206

perror_plus("nanosleep");

2207

}

2208

}

2209

2210

errno = old_errno;

2211

return 0;

2212

}

2213

2214

__attribute__((nonnull, warn_unused_result))

2215

int take_down_interface(const char *const interface){

2216

int old_errno = errno;

2217

struct ifreq network;

2218

unsigned int if_index = if_nametoindex(interface);

2219

if(if_index == 0){

2220

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

2221

errno = old_errno;

2222

return ENXIO;

2223

}

2224

if(interface_is_up(interface)){

2225

int ret_errno = 0;

2226

int ioctl_errno = 0;

2227

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

2228

ret_errno = errno;

2229

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

2230

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

2231

errno = old_errno;

2232

return ret_errno;

2233

}

2234

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

2235

2236

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

2237

if(sd == -1){

2238

ret_errno = errno;

2239

perror_plus("socket");

2240

errno = old_errno;

2241

return ret_errno;

2242

}

2243

2244

if(debug){

2245

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

2246

interface);

2247

}

2248

2249

/* Raise privileges */

2250

ret_errno = raise_privileges();

2251

if(ret_errno != 0){

2252

errno = ret_errno;

2253

perror_plus("Failed to raise privileges");

2254

}

2255

2256

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

2257

ioctl_errno = errno;

2258

2259

/* If raise_privileges() succeeded above */

2260

if(ret_errno == 0){

2261

/* Lower privileges */

2262

ret_errno = lower_privileges();

2263

if(ret_errno != 0){

2264

errno = ret_errno;

2265

perror_plus("Failed to lower privileges");

2266

}

2267

}

2268

2269

/* Close the socket */

2270

int ret = close(sd);

2271

if(ret == -1){

2272

perror_plus("close");

2273

}

2274

2275

if(ret_setflags == -1){

2276

errno = ioctl_errno;

2277

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2278

errno = old_errno;

2279

return ioctl_errno;

2280

}

2281

} else if(debug){

2282

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

2283

interface);

2284

}

2285

2286

errno = old_errno;

2287

return 0;

2288

}

2289

1264

2290

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

2291

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

2292

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

2293

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

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

1265

2296

AvahiSServiceBrowser *sb = NULL;

1266

int error;

2297

error_t ret_errno;

1267

2298

int ret;

1268

2299

intmax_t tmpmax;

1269

2300

char *tmp;

1270

2301

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

1272

struct ifreq network;

1273

int sd = -1;

1274

bool take_down_interface = false;

1275

uid_t uid;

1276

gid_t gid;

1277

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

1278

bool tempdir_created = false;

2302

char *interfaces_to_take_down = NULL;

2303

size_t interfaces_to_take_down_size = 0;

2304

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

2305

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

2306

char *tempdir = NULL;

1279

2307

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1280

2308

const char *seckey = PATHDIR "/" SECKEY;

1281

2309

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

2311

char *interfaces_hooks = NULL;

1282

2312

1283

2313

bool gnutls_initialized = false;

1284

2314

bool gpgme_initialized = false;

1285

2315

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

2316

double retry_interval = 10; /* 10s between trying a server and

2317

retrying the same server again */

1287

2318

1288

2319

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

2320

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1335

2366

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

1336

2367

" Diffie-Hellman key exchange",

1337

2368

.group = 2 },

2369

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

2370

.arg = "FILE",

2371

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

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

1338

2374

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

1339

2375

.arg = "STRING",

1340

2376

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

1345

2381

.group = 2 },

1346

2382

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

1347

2383

.arg = "SECONDS",

1348

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

2384

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

2385

.group = 2 },

2386

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

2387

.arg = "DIR",

2388

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

1349

2389

.group = 2 },

1350

2390

/*

1351

2391

* These reproduce what we would get without ARGP_NO_HELP

1370

2410

connect_to = arg;

1371

2411

break;

1372

2412

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

1373

interface = arg;

2413

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

2414

arg, (int)',');

2415

if(ret_errno != 0){

2416

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

2417

}

1374

2418

break;

1375

2419

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

1376

2420

seckey = arg;

1387

2431

}

1388

2432

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

1389

2433

break;

2434

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

2435

dh_params_file = arg;

2436

break;

1390

2437

case 130: /* --priority */

1391

2438

mc.priority = arg;

1392

2439

break;

1400

2447

errno = 0;

1401

2448

retry_interval = strtod(arg, &tmp);

1402

2449

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

1403

or (retry_interval * 1000) > INT_MAX){

2450

or (retry_interval * 1000) > INT_MAX

2451

or retry_interval < 0){

1404

2452

argp_error(state, "Bad retry interval");

1405

2453

}

1406

2454

break;

2455

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

2456

hookdir = arg;

2457

break;

1407

2458

/*

1408

2459

* These reproduce what we would get without ARGP_NO_HELP

1409

2460

*/

1415

2466

argp_state_help(state, state->out_stream,

1416

2467

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

2468

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

1418

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

2469

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

1419

2470

exit(argp_err_exit_status);

1420

2471

break;

1421

2472

default:

1428

2479

.args_doc = "",

1429

2480

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

1430

2481

" passwords from a Mandos server" };

1431

ret = argp_parse(&argp, argc, argv,

1432

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1433

switch(ret){

2482

ret_errno = argp_parse(&argp, argc, argv,

2483

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2484

switch(ret_errno){

1434

2485

case 0:

1435

2486

break;

1436

2487

case ENOMEM:

1437

2488

default:

1438

errno = ret;

2489

errno = ret_errno;

1439

2490

perror_plus("argp_parse");

1440

2491

exitcode = EX_OSERR;

1441

2492

goto end;

1445

2496

}

1446

2497

}

1447

2498

2499

{

2500

/* Work around Debian bug #633582:

2501

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

2502

2503

/* Re-raise privileges */

2504

ret = raise_privileges();

2505

if(ret != 0){

2506

errno = ret;

2507

perror_plus("Failed to raise privileges");

2508

} else {

2509

struct stat st;

2510

2511

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

2512

int seckey_fd = open(seckey, O_RDONLY);

2513

if(seckey_fd == -1){

2514

perror_plus("open");

2515

} else {

2516

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

2517

if(ret == -1){

2518

perror_plus("fstat");

2519

} else {

2520

if(S_ISREG(st.st_mode)

2521

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

2522

ret = fchown(seckey_fd, uid, gid);

2523

if(ret == -1){

2524

perror_plus("fchown");

2525

}

2526

}

2527

}

2528

close(seckey_fd);

2529

}

2530

}

2531

2532

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

2533

int pubkey_fd = open(pubkey, O_RDONLY);

2534

if(pubkey_fd == -1){

2535

perror_plus("open");

2536

} else {

2537

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

2538

if(ret == -1){

2539

perror_plus("fstat");

2540

} else {

2541

if(S_ISREG(st.st_mode)

2542

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

2543

ret = fchown(pubkey_fd, uid, gid);

2544

if(ret == -1){

2545

perror_plus("fchown");

2546

}

2547

}

2548

}

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

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

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2572

}

2573

}

2574

2575

/* Lower privileges */

2576

ret = lower_privileges();

2577

if(ret != 0){

2578

errno = ret;

2579

perror_plus("Failed to lower privileges");

2580

}

2581

}

2582

}

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

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

2588

interface))){

2589

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

2590

and if_nametoindex(interface) == 0){

2591

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

2592

fprintf_plus(stderr, "Not using nonexisting interface"

2593

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

2594

}

2595

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

2596

interface = NULL;

2597

}

2598

}

2599

}

2600

2601

/* Run network hooks */

2602

{

2603

if(mc.interfaces != NULL){

2604

interfaces_hooks = malloc(mc.interfaces_size);

2605

if(interfaces_hooks == NULL){

2606

perror_plus("malloc");

2607

goto end;

2608

}

2609

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

2610

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

2611

}

2612

run_network_hooks("start", interfaces_hooks != NULL ?

2613

interfaces_hooks : "", delay);

2614

}

2615

1448

2616

if(not debug){

1449

2617

avahi_set_log_function(empty_log);

1450

2618

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1476

2619

1477

2620

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

1478

2621

from the signal handler */

1479

2622

/* Initialize the pseudo-RNG for Avahi */

1480

2623

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

1481

mc.simple_poll = avahi_simple_poll_new();

1482

if(mc.simple_poll == NULL){

1483

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

2624

simple_poll = avahi_simple_poll_new();

2625

if(simple_poll == NULL){

2626

fprintf_plus(stderr,

2627

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

1484

2628

exitcode = EX_UNAVAILABLE;

1485

2629

goto end;

1486

2630

}

1548

2692

}

1549

2693

}

1550

2694

1551

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

1552

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

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

if(if_index == 0){

1555

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

1556

exitcode = EX_UNAVAILABLE;

1557

goto end;

1558

}

1559

1560

if(quit_now){

1561

goto end;

1562

}

1563

1564

/* Re-raise priviliges */

1565

errno = 0;

1566

ret = seteuid(0);

1567

if(ret == -1){

1568

perror_plus("seteuid");

1569

}

1570

1571

#ifdef __linux__

1572

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1573

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

1574

ret = klogctl(8, NULL, 5);

1575

bool restore_loglevel = true;

1576

if(ret == -1){

1577

restore_loglevel = false;

1578

perror_plus("klogctl");

1579

}

1580

#endif /* __linux__ */

1581

1582

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

if(sd < 0){

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1586

#ifdef __linux__

1587

if(restore_loglevel){

1588

ret = klogctl(7, NULL, 0);

1589

if(ret == -1){

1590

perror_plus("klogctl");

1591

}

1592

}

1593

#endif /* __linux__ */

1594

/* Lower privileges */

1595

errno = 0;

1596

ret = seteuid(uid);

1597

if(ret == -1){

1598

perror_plus("seteuid");

1599

}

1600

goto end;

1601

}

1602

strcpy(network.ifr_name, interface);

1603

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

1604

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1606

#ifdef __linux__

1607

if(restore_loglevel){

1608

ret = klogctl(7, NULL, 0);

1609

if(ret == -1){

1610

perror_plus("klogctl");

1611

}

1612

}

1613

#endif /* __linux__ */

1614

exitcode = EX_OSERR;

1615

/* Lower privileges */

1616

errno = 0;

1617

ret = seteuid(uid);

1618

if(ret == -1){

1619

perror_plus("seteuid");

1620

}

1621

goto end;

1622

}

1623

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

1624

network.ifr_flags |= IFF_UP;

1625

take_down_interface = true;

1626

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

1627

if(ret == -1){

1628

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1631

#ifdef __linux__

1632

if(restore_loglevel){

1633

ret = klogctl(7, NULL, 0);

1634

if(ret == -1){

1635

perror_plus("klogctl");

2695

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

2696

if(mc.interfaces == NULL){

2697

struct dirent **direntries = NULL;

2698

/* Look for any good interfaces */

2699

ret = scandir(sys_class_net, &direntries, good_interface,

2700

alphasort);

2701

if(ret >= 1){

2702

/* Add all found interfaces to interfaces list */

2703

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

2704

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

2705

direntries[i]->d_name);

2706

if(ret_errno != 0){

2707

errno = ret_errno;

2708

perror_plus("argz_add");

2709

free(direntries[i]);

2710

continue;

2711

}

2712

if(debug){

2713

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

2714

direntries[i]->d_name);

2715

}

2716

free(direntries[i]);

2717

}

2718

free(direntries);

2719

} else {

2720

if(ret == 0){

2721

free(direntries);

2722

}

2723

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

2724

exitcode = EXIT_FAILURE;

2725

goto end;

2726

}

2727

}

2728

2729

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

2730

{

2731

char *interface = NULL;

2732

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

2733

interface))){

2734

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

2735

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

2736

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

2737

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

2738

interface);

2739

interface = NULL;

2740

while((interface = argz_next(mc.interfaces,

2741

mc.interfaces_size, interface))){

2742

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

2743

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

2744

interface);

2745

interface = NULL;

1636

2746

}

1637

2747

}

1638

#endif /* __linux__ */

1639

/* Lower privileges */

1640

errno = 0;

1641

ret = seteuid(uid);

1642

if(ret == -1){

1643

perror_plus("seteuid");

1644

}

1645

goto end;

1646

}

1647

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1649

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

1650

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

1651

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_RUNNING){

1654

2748

break;

1655

2749

}

1656

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

ret = nanosleep(&sleeptime, NULL);

1658

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

1659

perror_plus("nanosleep");

1660

}

1661

}

1662

if(not take_down_interface){

1663

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

1664

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

1665

if(ret == -1){

1666

perror_plus("close");

1667

}

1668

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1673

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1676

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

1686

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

1691

}

1692

}

2750

bool interface_was_up = interface_is_up(interface);

2751

errno = bring_up_interface(interface, delay);

2752

if(not interface_was_up){

2753

if(errno != 0){

2754

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

2755

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

2756

} else {

2757

errno = argz_add(&interfaces_to_take_down,

2758

&interfaces_to_take_down_size,

2759

interface);

2760

if(errno != 0){

2761

perror_plus("argz_add");

2762

}

2763

}

2764

}

2765

}

2766

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

2767

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

2768

}

2769

}

2770

2771

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

2772

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

2773

if(debug){

2774

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

2775

mc.interfaces);

2776

}

2777

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

1693

2778

}

1694

2779

1695

2780

if(quit_now){

1696

2781

goto end;

1697

2782

}

1698

2783

1699

ret = init_gnutls_global(pubkey, seckey);

2784

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

1700

2785

if(ret == -1){

1701

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

2786

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

1702

2787

exitcode = EX_UNAVAILABLE;

1703

2788

goto end;

1704

2789

} else {

1709

2794

goto end;

1710

2795

}

1711

2796

1712

if(mkdtemp(tempdir) == NULL){

2797

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

2798

tempdir = mkdtemp(run_tempdir);

2799

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

2800

if(debug){

2801

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

2802

run_tempdir, old_tempdir);

2803

}

2804

tempdir = mkdtemp(old_tempdir);

2805

}

2806

if(tempdir == NULL){

1713

2807

perror_plus("mkdtemp");

1714

2808

goto end;

1715

2809

}

1716

tempdir_created = true;

1717

2810

1718

2811

if(quit_now){

1719

2812

goto end;

1720

2813

}

1721

2814

1722

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

1723

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

2815

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

2816

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

1724

2817

exitcode = EX_UNAVAILABLE;

1725

2818

goto end;

1726

2819

} else {

1735

2828

/* Connect directly, do not use Zeroconf */

1736

2829

/* (Mainly meant for debugging) */

1737

2830

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

2831

1738

2832

if(address == NULL){

1739

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

2833

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

1740

2834

exitcode = EX_USAGE;

1741

2835

goto end;

1742

2836

}

1745

2839

goto end;

1746

2840

}

1747

2841

1748

uint16_t port;

2842

in_port_t port;

1749

2843

errno = 0;

1750

2844

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

1751

2845

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

1752

or tmpmax != (uint16_t)tmpmax){

1753

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

2846

or tmpmax != (in_port_t)tmpmax){

2847

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

1754

2848

exitcode = EX_USAGE;

1755

2849

goto end;

1756

2850

}

1757

2851

1758

2852

if(quit_now){

1759

2853

goto end;

1760

2854

}

1761

2855

1762

port = (uint16_t)tmpmax;

2856

port = (in_port_t)tmpmax;

1763

2857

*address = '\0';

1764

address = connect_to;

1765

2858

/* Colon in address indicates IPv6 */

1766

2859

int af;

1767

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

2860

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

1768

2861

af = AF_INET6;

2862

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

2863

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

2864

{

2865

connect_to++;

2866

address[-1] = '\0';

2867

}

1769

2868

} else {

1770

2869

af = AF_INET;

1771

2870

}

2871

address = connect_to;

1772

2872

1773

2873

if(quit_now){

1774

2874

goto end;

1775

2875

}

1776

2876

1777

2877

while(not quit_now){

1778

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

2878

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

2879

&mc);

1779

2880

if(quit_now or ret == 0){

1780

2881

break;

1781

2882

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

1785

if (not quit_now){

2883

if(debug){

2884

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

2885

(int)retry_interval);

2886

}

2887

sleep((unsigned int)retry_interval);

2888

}

2889

2890

if(not quit_now){

1786

2891

exitcode = EXIT_SUCCESS;

1787

2892

}

1788

2893

1789

2894

goto end;

1790

2895

}

1791

2896

1803

2908

config.publish_domain = 0;

1804

2909

1805

2910

/* Allocate a new server */

1806

mc.server = avahi_server_new(avahi_simple_poll_get

1807

(mc.simple_poll), &config, NULL,

1808

NULL, &error);

2911

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2912

&config, NULL, NULL, &ret);

1809

2913

1810

2914

/* Free the Avahi configuration data */

1811

2915

avahi_server_config_free(&config);

1813

2917

1814

2918

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

1815

2919

if(mc.server == NULL){

1816

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

1817

avahi_strerror(error));

2920

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

2921

avahi_strerror(ret));

1818

2922

exitcode = EX_UNAVAILABLE;

1819

2923

goto end;

1820

2924

}

1826

2930

/* Create the Avahi service browser */

1827

2931

sb = avahi_s_service_browser_new(mc.server, if_index,

1828

2932

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1829

NULL, 0, browse_callback, NULL);

2933

NULL, 0, browse_callback,

2934

(void *)&mc);

1830

2935

if(sb == NULL){

1831

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

1832

avahi_strerror(avahi_server_errno(mc.server)));

2936

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

2937

avahi_strerror(avahi_server_errno(mc.server)));

1833

2938

exitcode = EX_UNAVAILABLE;

1834

2939

goto end;

1835

2940

}

1841

2946

/* Run the main loop */

1842

2947

1843

2948

if(debug){

1844

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

2949

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

1845

2950

}

1846

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

2951

2952

ret = avahi_loop_with_timeout(simple_poll,

2953

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

1848

2954

if(debug){

1849

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

1850

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

2955

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

2956

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

1851

2957

}

1852

2958

1853

2959

end:

1854

2960

1855

2961

if(debug){

1856

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

2962

if(signal_received){

2963

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2964

argv[0], signal_received,

2965

strsignal(signal_received));

2966

} else {

2967

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

2968

}

1857

2969

}

1858

2970

1859

2971

/* Cleanup things */

2972

free(mc.interfaces);

2973

1860

2974

if(sb != NULL)

1861

2975

avahi_s_service_browser_free(sb);

1862

2976

1863

2977

if(mc.server != NULL)

1864

2978

avahi_server_free(mc.server);

1865

2979

1866

if(mc.simple_poll != NULL)

1867

avahi_simple_poll_free(mc.simple_poll);

2980

if(simple_poll != NULL)

2981

avahi_simple_poll_free(simple_poll);

1868

2982

1869

2983

if(gnutls_initialized){

1870

2984

gnutls_certificate_free_credentials(mc.cred);

1871

gnutls_global_deinit();

1872

2985

gnutls_dh_params_deinit(mc.dh_params);

1873

2986

}

1874

2987

1875

2988

if(gpgme_initialized){

1876

2989

gpgme_release(mc.ctx);

1877

2990

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

2991

2992

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

2993

has seen */

1880

2994

if(mc.current_server != NULL){

1881

2995

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

1882

2996

while(mc.current_server != NULL){

1883

2997

server *next = mc.current_server->next;

2998

#ifdef __GNUC__

2999

#pragma GCC diagnostic push

3000

#pragma GCC diagnostic ignored "-Wcast-qual"

3001

#endif

3002

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

3003

#ifdef __GNUC__

3004

#pragma GCC diagnostic pop

3005

#endif

1884

3006

free(mc.current_server);

1885

3007

mc.current_server = next;

1886

3008

}

1887

3009

}

1888

3010

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

1892

errno = 0;

1893

ret = seteuid(0);

1894

if(ret == -1){

1895

perror_plus("seteuid");

1896

}

1897

if(geteuid() == 0){

1898

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

1899

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

1902

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

1903

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

1904

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1906

}

1907

}

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

1918

}

3011

/* Re-raise privileges */

3012

{

3013

ret = raise_privileges();

3014

if(ret != 0){

3015

errno = ret;

3016

perror_plus("Failed to raise privileges");

3017

} else {

3018

3019

/* Run network hooks */

3020

run_network_hooks("stop", interfaces_hooks != NULL ?

3021

interfaces_hooks : "", delay);

3022

3023

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

3024

{

3025

char *interface = NULL;

3026

while((interface = argz_next(interfaces_to_take_down,

3027

interfaces_to_take_down_size,

3028

interface))){

3029

ret = take_down_interface(interface);

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to take down interface");

3033

}

3034

}

3035

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

3036

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

3037

" down\n");

3038

}

3039

}

3040

}

3041

3042

ret = lower_privileges_permanently();

3043

if(ret != 0){

3044

errno = ret;

3045

perror_plus("Failed to lower privileges permanently");

3046

}

3047

}

3048

3049

free(interfaces_to_take_down);

3050

free(interfaces_hooks);

3051

3052

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

3053

uintmax_t level){

3054

struct dirent **direntries = NULL;

3055

int dret;

3056

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

3057

O_RDONLY

3058

| O_NOFOLLOW

3059

| O_DIRECTORY

3060

| O_PATH));

3061

if(dir_fd == -1){

3062

perror_plus("open");

3063

}

3064

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

3065

notdotentries, alphasort);

3066

if(numentries >= 0){

3067

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

3068

if(debug){

3069

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

3070

dirname, direntries[i]->d_name);

3071

}

3072

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

3073

if(dret == -1){

3074

if(errno == EISDIR){

3075

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

3076

AT_REMOVEDIR);

3077

}

3078

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

3079

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

3080

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

3081

/* Recurse only in this special case */

3082

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

3083

dret = 0;

3084

}

3085

if(dret == -1){

3086

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

3087

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

3088

}

3089

}

3090

free(direntries[i]);

3091

}

3092

3093

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

3094

free(direntries);

3095

if(numentries == -1){

3096

perror_plus("scandirat");

3097

}

3098

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3099

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

3100

perror_plus("rmdir");

3101

}

3102

} else {

3103

perror_plus("scandirat");

3104

}

3105

close(dir_fd);

1919

3106

}

1920

3107

1921

3108

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

1922

if(tempdir_created){

1923

struct dirent **direntries = NULL;

1924

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

1928

direntry = direntries[i];

1929

char *fullname = NULL;

1930

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

1931

direntry->d_name);

1932

if(ret < 0){

1933

perror_plus("asprintf");

1934

continue;

1935

}

1936

ret = remove(fullname);

1937

if(ret == -1){

1938

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

1939

strerror(errno));

1940

}

1941

free(fullname);

1942

}

1943

}

1944

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

1946

free(direntries);

1947

if (ret == -1){

1948

perror_plus("scandir");

1949

}

1950

ret = rmdir(tempdir);

1951

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

1952

perror_plus("rmdir");

1953

}

3109

if(tempdir != NULL){

3110

clean_dir_at(-1, tempdir, 0);

1954

3111

}

1955

3112

1956

3113

if(quit_now){