/mandos/release : revision 237.7.325

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

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*

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* Everything else is

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*

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

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

32

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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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(), strcpy() */

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

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

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

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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() */

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause() */

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

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setgid(), pause(), _exit(),

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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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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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168

server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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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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* "buffer_length" is how much is already used.

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202

*/

203

__attribute__((nonnull, warn_unused_result))

182

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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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206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

186

if(buffer == NULL){

207

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

190

217

}

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218

return buffer_capacity;

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}

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

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

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

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if(new_server == NULL){

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228

perror_plus("malloc");

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return -1;

229

return false;

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230

}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

209

236

perror_plus("strdup");

210

return -1;

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

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#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

211

253

}

212

254

/* Special case of first server */

213

if (mc.current_server == NULL){

255

if(*current_server == NULL){

214

256

new_server->next = new_server;

215

257

new_server->prev = new_server;

216

mc.current_server = new_server;

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

258

*current_server = new_server;

218

259

} else {

219

new_server->next = mc.current_server;

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

260

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

261

new_server->next = *current_server;

262

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

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new_server->prev->next = new_server;

222

mc.current_server->prev = new_server;

223

}

224

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

225

if(ret == -1){

226

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

264

(*current_server)->prev = new_server;

265

}

266

return true;

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}

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/*

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* Initialize GPGME.

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271

*/

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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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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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282

*/

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bool import_key(const char *filename){

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bool import_key(const char * const filename){

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284

int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

256

295

if(rc != GPG_ERR_NO_ERROR){

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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299

}

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300

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

264

302

if(rc != GPG_ERR_NO_ERROR){

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

269

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}

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307

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

308

ret = close(fd);

272

309

if(ret == -1){

273

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perror_plus("close");

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}

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314

}

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if(debug){

280

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

281

"Initializing GPGME\n");

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

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}

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/* Init GPGME */

285

321

gpgme_check_version(NULL);

286

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

288

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

291

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return false;

292

327

}

293

328

294

329

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

295

330

rc = gpgme_get_engine_info(&engine_info);

296

331

if(rc != GPG_ERR_NO_ERROR){

297

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

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

300

334

return false;

301

335

}

302

336

while(engine_info != NULL){

308

342

engine_info = engine_info->next;

309

343

}

310

344

if(engine_info == NULL){

311

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

312

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

345

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

346

tempdir);

313

347

return false;

314

348

}

315

349

316

350

/* Create new GPGME "context" */

317

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

351

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

318

352

if(rc != GPG_ERR_NO_ERROR){

319

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

320

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

321

gpgme_strerror(rc));

353

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

354

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

355

gpgme_strerror(rc));

322

356

return false;

323

357

}

324

358

333

367

* Decrypt OpenPGP data.

334

368

* Returns -1 on error

335

369

*/

370

__attribute__((nonnull, warn_unused_result))

336

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

337

372

size_t crypto_size,

338

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

339

375

gpgme_data_t dh_crypto, dh_plain;

340

376

gpgme_error_t rc;

341

377

ssize_t ret;

343

379

ssize_t plaintext_length = 0;

344

380

345

381

if(debug){

346

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

347

"Trying to decrypt OpenPGP data\n");

382

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

348

383

}

349

384

350

385

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

351

386

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

352

387

0);

353

388

if(rc != GPG_ERR_NO_ERROR){

354

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

355

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

356

gpgme_strsource(rc), gpgme_strerror(rc));

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

357

391

return -1;

358

392

}

359

393

360

394

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

361

395

rc = gpgme_data_new(&dh_plain);

362

396

if(rc != GPG_ERR_NO_ERROR){

363

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

364

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

365

gpgme_strsource(rc), gpgme_strerror(rc));

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

366

400

gpgme_data_release(dh_crypto);

367

401

return -1;

368

402

}

369

403

370

404

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

371

405

data buffer */

372

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

406

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

373

407

if(rc != GPG_ERR_NO_ERROR){

374

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

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

377

410

plaintext_length = -1;

378

411

if(debug){

379

412

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

381

414

if(result == NULL){

382

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

383

"gpgme_op_decrypt_result failed\n");

415

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

384

416

} else {

385

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

386

"Unsupported algorithm: %s\n",

387

result->unsupported_algorithm);

388

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

389

"Wrong key usage: %u\n",

390

result->wrong_key_usage);

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

391

421

if(result->file_name != NULL){

392

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

393

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

422

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

394

423

}

395

424

gpgme_recipient_t recipient;

396

425

recipient = result->recipients;

397

426

while(recipient != NULL){

398

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

399

"Public key algorithm: %s\n",

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

401

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

402

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

403

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

404

"Secret key available: %s\n",

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

407

434

recipient = recipient->next;

408

435

}

409

436

}

412

439

}

413

440

414

441

if(debug){

415

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

416

"Decryption of OpenPGP data succeeded\n");

442

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

417

443

}

418

444

419

445

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

426

452

*plaintext = NULL;

427

453

while(true){

428

454

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

455

(size_t)plaintext_length,

456

plaintext_capacity);

431

457

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

435

461

}

436

462

437

463

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

476

}

451

477

452

478

if(debug){

453

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

454

"Decrypted password is: ");

479

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

455

480

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

456

481

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

457

482

}

468

493

return plaintext_length;

469

494

}

470

495

471

static const char * safer_gnutls_strerror(int value){

472

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

473

-Wunreachable-code */

474

if(ret == NULL)

475

ret = "(unknown)";

476

return ret;

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

477

507

}

478

508

479

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

480

511

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

481

512

const char* string){

482

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

513

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

483

514

}

484

515

516

__attribute__((nonnull, warn_unused_result))

485

517

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

487

521

int ret;

522

unsigned int uret;

488

523

489

524

if(debug){

490

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

491

"Initializing GnuTLS\n");

525

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

492

526

}

493

527

494

528

ret = gnutls_global_init();

495

529

if(ret != GNUTLS_E_SUCCESS){

496

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

497

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

530

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

531

safer_gnutls_strerror(ret));

498

532

return -1;

499

533

}

500

534

507

541

}

508

542

509

543

/* OpenPGP credentials */

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

511

545

if(ret != GNUTLS_E_SUCCESS){

512

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

513

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

514

548

gnutls_global_deinit();

515

549

return -1;

516

550

}

517

551

518

552

if(debug){

519

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

520

"Attempting to use OpenPGP public key %s and"

521

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

522

seckeyfilename);

553

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

554

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

555

pubkeyfilename,

556

seckeyfilename);

523

557

}

524

558

525

559

ret = gnutls_certificate_set_openpgp_key_file

526

(mc.cred, pubkeyfilename, seckeyfilename,

560

(mc->cred, pubkeyfilename, seckeyfilename,

527

561

GNUTLS_OPENPGP_FMT_BASE64);

528

562

if(ret != GNUTLS_E_SUCCESS){

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

531

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

532

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

533

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

534

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

563

fprintf_plus(stderr,

564

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

565

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

566

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

567

safer_gnutls_strerror(ret));

535

568

goto globalfail;

536

569

}

537

570

538

571

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

540

if(ret != GNUTLS_E_SUCCESS){

541

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

542

"Error in GnuTLS DH parameter initialization:"

543

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

544

goto globalfail;

545

}

546

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

547

if(ret != GNUTLS_E_SUCCESS){

548

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

549

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

550

safer_gnutls_strerror(ret));

551

goto globalfail;

552

}

553

554

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

572

ret = gnutls_dh_params_init(&mc->dh_params);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

" initialization: %s\n",

576

safer_gnutls_strerror(ret));

577

goto globalfail;

578

}

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

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

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

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

628

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

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

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

637

/* Try to read the private key file */

638

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

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

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

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

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

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

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

689

if(ret != GNUTLS_E_SUCCESS){

690

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

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

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

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

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

726

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

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

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

733

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

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

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

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

751

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

555

752

556

753

return 0;

557

754

558

755

globalfail:

559

756

560

gnutls_certificate_free_credentials(mc.cred);

757

gnutls_certificate_free_credentials(mc->cred);

561

758

gnutls_global_deinit();

562

gnutls_dh_params_deinit(mc.dh_params);

759

gnutls_dh_params_deinit(mc->dh_params);

563

760

return -1;

564

761

}

565

762

566

static int init_gnutls_session(gnutls_session_t *session){

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

567

766

int ret;

568

767

/* GnuTLS session creation */

569

768

do {

573

772

}

574

773

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

575

774

if(ret != GNUTLS_E_SUCCESS){

576

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

577

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

578

safer_gnutls_strerror(ret));

775

fprintf_plus(stderr,

776

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

777

safer_gnutls_strerror(ret));

579

778

}

580

779

581

780

{

582

781

const char *err;

583

782

do {

584

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

783

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

585

784

if(quit_now){

586

785

gnutls_deinit(*session);

587

786

return -1;

588

787

}

589

788

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

590

789

if(ret != GNUTLS_E_SUCCESS){

591

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

592

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

593

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

594

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

790

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

791

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

792

safer_gnutls_strerror(ret));

595

793

gnutls_deinit(*session);

596

794

return -1;

597

795

}

599

797

600

798

do {

601

799

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

602

mc.cred);

800

mc->cred);

603

801

if(quit_now){

604

802

gnutls_deinit(*session);

605

803

return -1;

606

804

}

607

805

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

608

806

if(ret != GNUTLS_E_SUCCESS){

609

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

610

"Error setting GnuTLS credentials: %s\n",

611

safer_gnutls_strerror(ret));

807

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

808

safer_gnutls_strerror(ret));

612

809

gnutls_deinit(*session);

613

810

return -1;

614

811

}

616

813

/* ignore client certificate if any. */

617

814

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

618

815

619

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

620

621

816

return 0;

622

817

}

623

818

625

820

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

626

821

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

627

822

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

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

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

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

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

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

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

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

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

ret = close(devnull);

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

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

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

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

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

close(helperdir_fd);

958

_exit(EX_UNAVAILABLE);

959

}

960

close(helperdir_fd);

961

#ifdef __GNUC__

962

#pragma GCC diagnostic push

963

#pragma GCC diagnostic ignored "-Wcast-qual"

964

#endif

965

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

966

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

967

interface, debug ? debug_flag : NULL, NULL },

968

environ) == -1){

969

#ifdef __GNUC__

970

#pragma GCC diagnostic pop

971

#endif

972

perror_plus("fexecve");

973

_exit(EXIT_FAILURE);

974

}

975

}

976

if(pid == -1){

977

perror_plus("fork");

978

return false;

979

}

980

int status;

981

pid_t pret = -1;

982

errno = 0;

983

do {

984

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

985

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

986

int errno_raising = 0;

987

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

988

errno_raising = errno;

989

perror_plus("Failed to raise privileges in order to"

990

" kill helper program");

991

}

992

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

993

perror_plus("kill");

994

}

995

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

996

perror_plus("Failed to lower privileges after killing"

997

" helper program");

998

}

999

return false;

1000

}

1001

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

1002

if(pret == -1){

1003

perror_plus("waitpid");

1004

return false;

1005

}

1006

if(WIFEXITED(status)){

1007

if(WEXITSTATUS(status) != 0){

1008

fprintf_plus(stderr, "Error: iprouteadddel exited"

1009

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

1010

return false;

1011

}

1012

return true;

1013

}

1014

if(WIFSIGNALED(status)){

1015

fprintf_plus(stderr, "Error: iprouteadddel died by"

1016

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

1017

return false;

1018

}

1019

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

1020

return false;

1021

}

1022

1023

__attribute__((nonnull, warn_unused_result))

1024

static bool add_local_route(const char *address,

1025

AvahiIfIndex if_index){

1026

if(debug){

1027

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

1028

}

1029

return add_delete_local_route(true, address, if_index);

1030

}

1031

1032

__attribute__((nonnull, warn_unused_result))

1033

static bool delete_local_route(const char *address,

1034

AvahiIfIndex if_index){

1035

if(debug){

1036

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

1037

}

1038

return add_delete_local_route(false, address, if_index);

1039

}

1040

628

1041

/* Called when a Mandos server is found */

629

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

1042

__attribute__((nonnull, warn_unused_result))

1043

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

630

1044

AvahiIfIndex if_index,

631

int af){

1045

int af, mandos_context *mc){

632

1046

int ret, tcp_sd = -1;

633

1047

ssize_t sret;

634

union {

635

struct sockaddr_in in;

636

struct sockaddr_in6 in6;

637

} to;

1048

struct sockaddr_storage to;

638

1049

char *buffer = NULL;

639

1050

char *decrypted_buffer = NULL;

640

1051

size_t buffer_length = 0;

643

1054

int retval = -1;

644

1055

gnutls_session_t session;

645

1056

int pf; /* Protocol family */

1057

bool route_added = false;

646

1058

647

1059

errno = 0;

648

1060

659

1071

pf = PF_INET;

660

1072

break;

661

1073

default:

662

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

663

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

1074

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

664

1075

errno = EINVAL;

665

1076

return -1;

666

1077

}

667

1078

668

ret = init_gnutls_session(&session);

1079

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

1080

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

1081

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

1082

bool match = false;

1083

{

1084

char *interface = NULL;

1085

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

1086

interface))){

1087

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

1088

match = true;

1089

break;

1090

}

1091

}

1092

}

1093

if(not match){

1094

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

1095

connect to the server */

1096

if(debug){

1097

char interface[IF_NAMESIZE];

1098

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

1099

perror_plus("if_indextoname");

1100

} else {

1101

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

1102

" \"%s\"\n",

1103

if_indextoname((unsigned int)if_index,

1104

interface));

1105

}

1106

}

1107

return -1;

1108

}

1109

}

1110

1111

ret = init_gnutls_session(&session, mc);

669

1112

if(ret != 0){

670

1113

return -1;

671

1114

}

672

1115

673

1116

if(debug){

674

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

675

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

676

"\n", ip, port);

1117

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

1118

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

677

1119

}

678

1120

679

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

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

680

1122

if(tcp_sd < 0){

681

1123

int e = errno;

682

1124

perror_plus("socket");

689

1131

goto mandos_end;

690

1132

}

691

1133

692

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

693

1134

if(af == AF_INET6){

694

to.in6.sin6_family = (sa_family_t)af;

695

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

1135

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

1136

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

1137

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

696

1138

} else { /* IPv4 */

697

to.in.sin_family = (sa_family_t)af;

698

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

1139

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

1140

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

1141

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

699

1142

}

700

1143

if(ret < 0 ){

701

1144

int e = errno;

705

1148

}

706

1149

if(ret == 0){

707

1150

int e = errno;

708

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

709

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

1151

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

710

1152

errno = e;

711

1153

goto mandos_end;

712

1154

}

713

1155

if(af == AF_INET6){

714

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

715

-Wconversion and

716

-Wunreachable-code */

717

718

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

719

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

720

-Wunreachable-code*/

1156

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

1157

if(IN6_IS_ADDR_LINKLOCAL

1158

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

721

1159

if(if_index == AVAHI_IF_UNSPEC){

722

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

723

"An IPv6 link-local address is incomplete"

724

" without a network interface\n");

1160

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

1161

" incomplete without a network interface\n");

725

1162

errno = EINVAL;

726

1163

goto mandos_end;

727

1164

}

728

1165

/* Set the network interface number as scope */

729

to.in6.sin6_scope_id = (uint32_t)if_index;

1166

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

730

1167

}

731

1168

} else {

732

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

733

-Wconversion and

734

-Wunreachable-code */

1169

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

735

1170

}

736

1171

737

1172

if(quit_now){

745

1180

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

746

1181

perror_plus("if_indextoname");

747

1182

} else {

748

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

749

"Connection to: %s%%%s, port %" PRIu16 "\n",

750

ip, interface, port);

1183

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

1184

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

751

1185

}

752

1186

} else {

753

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

754

"Connection to: %s, port %" PRIu16 "\n", ip, port);

1187

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

1188

ip, (uintmax_t)port);

755

1189

}

756

1190

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

757

1191

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

758

const char *pcret;

759

if(af == AF_INET6){

760

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

761

sizeof(addrstr));

762

} else {

763

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

764

sizeof(addrstr));

765

}

766

if(pcret == NULL){

767

perror_plus("inet_ntop");

768

} else {

769

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

770

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

771

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

772

}

773

}

774

}

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

779

}

780

781

if(af == AF_INET6){

782

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

783

} else {

784

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

785

}

786

if(ret < 0){

787

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

788

int e = errno;

789

perror_plus("connect");

790

errno = e;

791

}

792

goto mandos_end;

793

}

794

795

if(quit_now){

796

errno = EINTR;

797

goto mandos_end;

1192

if(af == AF_INET6){

1193

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

1194

sizeof(struct sockaddr_in6),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

} else {

1198

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

1199

sizeof(struct sockaddr_in),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

}

1203

if(ret == EAI_SYSTEM){

1204

perror_plus("getnameinfo");

1205

} else if(ret != 0) {

1206

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

1207

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

1208

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

1209

}

1210

}

1211

1212

if(quit_now){

1213

errno = EINTR;

1214

goto mandos_end;

1215

}

1216

1217

while(true){

1218

if(af == AF_INET6){

1219

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

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

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

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

if(errno == ENETUNREACH

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

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

1236

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

1237

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

1238

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

1239

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

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

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

1243

1244

Avahi bug reference:

1245

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

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

798

1272

}

799

1273

800

1274

const char *out = mandos_protocol_version;

802

1276

while(true){

803

1277

size_t out_size = strlen(out);

804

1278

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

805

out_size - written));

1279

out_size - written));

806

1280

if(ret == -1){

807

1281

int e = errno;

808

1282

perror_plus("write");

828

1302

}

829

1303

830

1304

if(debug){

831

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

832

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

1305

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

833

1306

}

834

1307

835

1308

if(quit_now){

837

1310

goto mandos_end;

838

1311

}

839

1312

840

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

841

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1313

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

1314

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

1315

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

1316

gnutls_transport_set_ptr(session,

1317

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

842

1318

843

1319

if(quit_now){

844

1320

errno = EINTR;

855

1331

856

1332

if(ret != GNUTLS_E_SUCCESS){

857

1333

if(debug){

858

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

859

"*** GnuTLS Handshake failed ***\n");

1334

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

860

1335

gnutls_perror(ret);

861

1336

}

862

1337

errno = EPROTO;

866

1341

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

867

1342

868

1343

if(debug){

869

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

870

"Retrieving OpenPGP encrypted password from %s\n", ip);

1344

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1345

" %s\n", ip);

871

1346

}

872

1347

873

1348

while(true){

878

1353

}

879

1354

880

1355

buffer_capacity = incbuffer(&buffer, buffer_length,

881

buffer_capacity);

1356

buffer_capacity);

882

1357

if(buffer_capacity == 0){

883

1358

int e = errno;

884

1359

perror_plus("incbuffer");

911

1386

}

912

1387

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

913

1388

if(ret < 0){

914

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

915

"*** GnuTLS Re-handshake failed ***\n");

1389

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

1390

"***\n");

916

1391

gnutls_perror(ret);

917

1392

errno = EPROTO;

918

1393

goto mandos_end;

919

1394

}

920

1395

break;

921

1396

default:

922

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

923

"Unknown error while reading data from"

924

" encrypted session with Mandos server\n");

1397

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

1398

" encrypted session with Mandos server\n");

925

1399

gnutls_bye(session, GNUTLS_SHUT_RDWR);

926

1400

errno = EIO;

927

1401

goto mandos_end;

932

1406

}

933

1407

934

1408

if(debug){

935

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

936

"Closing TLS session\n");

1409

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

937

1410

}

938

1411

939

1412

if(quit_now){

951

1424

952

1425

if(buffer_length > 0){

953

1426

ssize_t decrypted_buffer_size;

954

decrypted_buffer_size = pgp_packet_decrypt(buffer,

955

buffer_length,

956

&decrypted_buffer);

1427

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1428

&decrypted_buffer, mc);

957

1429

if(decrypted_buffer_size >= 0){

958

1430

959

1431

written = 0;

969

1441

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

970

1442

int e = errno;

971

1443

if(debug){

972

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

973

"Error writing encrypted data: %s\n",

974

strerror(errno));

1444

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

1445

strerror(errno));

975

1446

}

976

1447

errno = e;

977

1448

goto mandos_end;

986

1457

987

1458

mandos_end:

988

1459

{

1460

if(route_added){

1461

if(not delete_local_route(ip, if_index)){

1462

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

1463

" interface %d", ip, if_index);

1464

}

1465

}

989

1466

int e = errno;

990

1467

free(decrypted_buffer);

991

1468

free(buffer);

992

1469

if(tcp_sd >= 0){

993

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

1470

ret = close(tcp_sd);

994

1471

}

995

1472

if(ret == -1){

996

1473

if(e == 0){

1008

1485

return retval;

1009

1486

}

1010

1487

1488

__attribute__((nonnull))

1011

1489

static void resolve_callback(AvahiSServiceResolver *r,

1012

1490

AvahiIfIndex interface,

1013

1491

AvahiProtocol proto,

1021

1499

AVAHI_GCC_UNUSED AvahiStringList *txt,

1022

1500

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1023

1501

flags,

1024

AVAHI_GCC_UNUSED void* userdata){

1025

assert(r);

1502

void *mc){

1503

if(r == NULL){

1504

return;

1505

}

1026

1506

1027

1507

/* Called whenever a service has been resolved successfully or

1028

1508

timed out */

1029

1509

1030

1510

if(quit_now){

1511

avahi_s_service_resolver_free(r);

1031

1512

return;

1032

1513

}

1033

1514

1034

1515

switch(event){

1035

1516

default:

1036

1517

case AVAHI_RESOLVER_FAILURE:

1037

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

1038

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

1039

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

1040

avahi_strerror(avahi_server_errno(mc.server)));

1518

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

1519

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

1520

domain,

1521

avahi_strerror(avahi_server_errno

1522

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

1041

1523

break;

1042

1524

1043

1525

case AVAHI_RESOLVER_FOUND:

1045

1527

char ip[AVAHI_ADDRESS_STR_MAX];

1046

1528

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

1047

1529

if(debug){

1048

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

1049

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

1050

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

1051

ip, (intmax_t)interface, port);

1530

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

1531

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

1532

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

1052

1533

}

1053

int ret = start_mandos_communication(ip, port, interface,

1054

avahi_proto_to_af(proto));

1534

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

1535

interface,

1536

avahi_proto_to_af(proto),

1537

mc);

1055

1538

if(ret == 0){

1056

avahi_simple_poll_quit(mc.simple_poll);

1539

avahi_simple_poll_quit(simple_poll);

1057

1540

} else {

1058

ret = add_server(ip, port, interface,

1059

avahi_proto_to_af(proto));

1541

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

1542

avahi_proto_to_af(proto),

1543

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

1544

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

1545

" list\n", name);

1546

}

1060

1547

}

1061

1548

}

1062

1549

}

1072

1559

const char *domain,

1073

1560

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1074

1561

flags,

1075

AVAHI_GCC_UNUSED void* userdata){

1076

assert(b);

1562

void *mc){

1563

if(b == NULL){

1564

return;

1565

}

1077

1566

1078

1567

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

1079

1568

is removed from the LAN */

1086

1575

default:

1087

1576

case AVAHI_BROWSER_FAILURE:

1088

1577

1089

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

1090

"(Avahi browser) %s\n",

1091

avahi_strerror(avahi_server_errno(mc.server)));

1092

avahi_simple_poll_quit(mc.simple_poll);

1578

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

1579

avahi_strerror(avahi_server_errno

1580

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

1581

avahi_simple_poll_quit(simple_poll);

1093

1582

return;

1094

1583

1095

1584

case AVAHI_BROWSER_NEW:

1098

1587

the callback function is called the Avahi server will free the

1099

1588

resolver for us. */

1100

1589

1101

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

1102

name, type, domain, protocol, 0,

1103

resolve_callback, NULL) == NULL)

1104

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

1105

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

1106

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

1590

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

1591

interface, protocol, name, type,

1592

domain, protocol, 0,

1593

resolve_callback, mc) == NULL)

1594

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

1595

" %s\n", name,

1596

avahi_strerror(avahi_server_errno

1597

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

1107

1598

break;

1108

1599

1109

1600

case AVAHI_BROWSER_REMOVE:

1112

1603

case AVAHI_BROWSER_ALL_FOR_NOW:

1113

1604

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1114

1605

if(debug){

1115

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

1116

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

1606

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

1607

" searching...\n");

1117

1608

}

1118

1609

break;

1119

1610

}

1128

1619

signal_received = sig;

1129

1620

int old_errno = errno;

1130

1621

/* set main loop to exit */

1131

if(mc.simple_poll != NULL){

1132

avahi_simple_poll_quit(mc.simple_poll);

1622

if(simple_poll != NULL){

1623

avahi_simple_poll_quit(simple_poll);

1133

1624

}

1134

1625

errno = old_errno;

1135

1626

}

1136

1627

1628

__attribute__((nonnull, warn_unused_result))

1137

1629

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

1138

1630

int ret;

1631

error_t ret_errno;

1139

1632

1140

1633

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

1141

1634

if(s < 0){

1635

ret_errno = errno;

1142

1636

perror_plus("socket");

1637

errno = ret_errno;

1143

1638

return false;

1144

1639

}

1145

1640

strcpy(ifr->ifr_name, ifname);

1146

1641

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1147

1642

if(ret == -1){

1148

1643

if(debug){

1644

ret_errno = errno;

1149

1645

perror_plus("ioctl SIOCGIFFLAGS");

1646

errno = ret_errno;

1150

1647

}

1151

1648

return false;

1152

1649

}

1153

1650

return true;

1154

1651

}

1155

1652

1653

__attribute__((nonnull, warn_unused_result))

1156

1654

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

1157

1655

1158

1656

/* Reject the loopback device */

1159

1657

if(ifr->ifr_flags & IFF_LOOPBACK){

1160

1658

if(debug){

1161

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

1162

"Rejecting loopback interface \"%s\"\n", ifname);

1659

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

1660

ifname);

1163

1661

}

1164

1662

return false;

1165

1663

}

1166

1664

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

1167

1665

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

1168

1666

if(debug){

1169

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

1170

"Accepting point-to-point interface \"%s\"\n", ifname);

1667

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

1668

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

1171

1669

}

1172

1670

return true;

1173

1671

}

1174

1672

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

1175

1673

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

1176

1674

if(debug){

1177

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

1178

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1675

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1676

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

1179

1677

}

1180

1678

return false;

1181

1679

}

1182

1680

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

1183

1681

if(ifr->ifr_flags & IFF_NOARP){

1184

1682

if(debug){

1185

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

1186

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

1683

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

1684

ifname);

1187

1685

}

1188

1686

return false;

1189

1687

}

1190

1688

1191

1689

/* Accept this device */

1192

1690

if(debug){

1193

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

1194

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

1691

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

1195

1692

}

1196

1693

return true;

1197

1694

}

1201

1698

* corresponds to an acceptable network device.

1202

1699

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

1203

1700

*/

1701

__attribute__((nonnull, warn_unused_result))

1204

1702

int good_interface(const struct dirent *if_entry){

1205

1703

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

1206

1704

return 0;

1209

1707

struct ifreq ifr;

1210

1708

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

1211

1709

if(debug){

1212

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

1213

"Failed to get flags for interface \"%s\"\n",

1214

if_entry->d_name);

1215

}

1216

return 0;

1217

}

1218

1219

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

1220

return 0;

1221

}

1222

return 1;

1223

}

1224

1225

/*

1226

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

1227

* corresponds to an acceptable network device which is up.

1228

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

1229

*/

1230

int up_interface(const struct dirent *if_entry){

1231

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

1232

return 0;

1233

}

1234

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

"Failed to get flags for interface \"%s\"\n",

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (ifr.ifr_flags & IFF_UP)){

1247

if(debug){

1248

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

1249

"Rejecting down interface \"%s\"\n",

1250

if_entry->d_name);

1251

}

1252

return 0;

1253

}

1254

1255

/* Reject non-running interfaces */

1256

if(not (ifr.ifr_flags & IFF_RUNNING)){

1257

if(debug){

1258

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

1259

"Rejecting non-running interface \"%s\"\n",

1260

if_entry->d_name);

1261

}

1262

return 0;

1263

}

1264

1265

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

1266

return 0;

1267

}

1268

return 1;

1269

}

1270

1710

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

1711

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

1712

}

1713

return 0;

1714

}

1715

1716

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

1717

return 0;

1718

}

1719

return 1;

1720

}

1721

1722

/*

1723

* This function determines if a network interface is up.

1724

*/

1725

__attribute__((nonnull, warn_unused_result))

1726

bool interface_is_up(const char *interface){

1727

struct ifreq ifr;

1728

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

1729

if(debug){

1730

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

1731

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

1732

}

1733

return false;

1734

}

1735

1736

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

1737

}

1738

1739

/*

1740

* This function determines if a network interface is running

1741

*/

1742

__attribute__((nonnull, warn_unused_result))

1743

bool interface_is_running(const char *interface){

1744

struct ifreq ifr;

1745

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

1746

if(debug){

1747

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

1748

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

1749

}

1750

return false;

1751

}

1752

1753

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

1754

}

1755

1756

__attribute__((nonnull, pure, warn_unused_result))

1271

1757

int notdotentries(const struct dirent *direntry){

1272

1758

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

1273

1759

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

1280

1766

}

1281

1767

1282

1768

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

1769

__attribute__((nonnull, warn_unused_result))

1283

1770

int runnable_hook(const struct dirent *direntry){

1284

1771

int ret;

1772

size_t sret;

1285

1773

struct stat st;

1286

1774

1287

1775

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

1289

1777

return 0;

1290

1778

}

1291

1779

1292

/* Save pointer to last character */

1293

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

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

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

1301

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

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1307

1308

char *fullname = NULL;

1309

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

1310

direntry->d_name);

1311

if(ret < 0){

1312

perror_plus("asprintf");

1313

return 0;

1314

}

1315

1316

ret = stat(fullname, &st);

1780

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

1781

"abcdefghijklmnopqrstuvwxyz"

1782

"0123456789"

1783

"_.-");

1784

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

1785

/* Contains non-allowed characters */

1786

if(debug){

1787

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

1788

direntry->d_name);

1789

}

1790

return 0;

1791

}

1792

1793

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

1317

1794

if(ret == -1){

1318

1795

if(debug){

1319

perror_plus("Could not stat plugin");

1796

perror_plus("Could not stat hook");

1320

1797

}

1321

1798

return 0;

1322

1799

}

1323

1800

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

1324

1801

/* Not a regular file */

1802

if(debug){

1803

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

1804

direntry->d_name);

1805

}

1325

1806

return 0;

1326

1807

}

1327

1808

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

1328

1809

/* Not executable */

1810

if(debug){

1811

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

1812

direntry->d_name);

1813

}

1329

1814

return 0;

1330

1815

}

1816

if(debug){

1817

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

1818

direntry->d_name);

1819

}

1331

1820

return 1;

1332

1821

}

1333

1822

1334

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1823

__attribute__((nonnull, warn_unused_result))

1824

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1825

mandos_context *mc){

1335

1826

int ret;

1336

1827

struct timespec now;

1337

1828

struct timespec waited_time;

1338

1829

intmax_t block_time;

1339

1830

1340

1831

while(true){

1341

if(mc.current_server == NULL){

1342

if (debug){

1343

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

1344

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

1832

if(mc->current_server == NULL){

1833

if(debug){

1834

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

1835

" No timeout!\n");

1345

1836

}

1346

1837

ret = avahi_simple_poll_iterate(s, -1);

1347

1838

} else {

1348

if (debug){

1349

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

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1839

if(debug){

1840

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

1841

" it, or wait\n");

1352

1842

}

1353

1843

/* the current time */

1354

1844

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1359

1849

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

1360

1850

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

1361

1851

waited_time.tv_sec = (now.tv_sec

1362

- mc.current_server->last_seen.tv_sec);

1852

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

1363

1853

waited_time.tv_nsec = (now.tv_nsec

1364

- mc.current_server->last_seen.tv_nsec);

1854

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

1365

1855

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

1366

1856

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

1367

1857

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

1369

1859

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

1370

1860

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

1371

1861

1372

if (debug){

1373

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

1374

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

1862

if(debug){

1863

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

1864

block_time);

1375

1865

}

1376

1866

1377

1867

if(block_time <= 0){

1378

ret = start_mandos_communication(mc.current_server->ip,

1379

mc.current_server->port,

1380

mc.current_server->if_index,

1381

mc.current_server->af);

1868

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

1869

mc->current_server->port,

1870

mc->current_server->if_index,

1871

mc->current_server->af, mc);

1382

1872

if(ret == 0){

1383

avahi_simple_poll_quit(mc.simple_poll);

1873

avahi_simple_poll_quit(s);

1384

1874

return 0;

1385

1875

}

1386

1876

ret = clock_gettime(CLOCK_MONOTONIC,

1387

&mc.current_server->last_seen);

1877

&mc->current_server->last_seen);

1388

1878

if(ret == -1){

1389

1879

perror_plus("clock_gettime");

1390

1880

return -1;

1391

1881

}

1392

mc.current_server = mc.current_server->next;

1882

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

1393

1883

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

1394

1884

servers, but don't block */

1395

1885

}

1397

1887

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

1398

1888

}

1399

1889

if(ret != 0){

1400

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

1890

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

1401

1891

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

1402

1892

}

1403

1893

}

1404

1894

}

1405

1895

}

1406

1896

1897

__attribute__((nonnull))

1898

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

1899

const float delay){

1900

struct dirent **direntries = NULL;

1901

if(hookdir_fd == -1){

1902

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1903

| O_CLOEXEC);

1904

if(hookdir_fd == -1){

1905

if(errno == ENOENT){

1906

if(debug){

1907

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

1908

" found\n", hookdir);

1909

}

1910

} else {

1911

perror_plus("open");

1912

}

1913

return;

1914

}

1915

}

1916

#ifdef __GLIBC__

1917

#if __GLIBC_PREREQ(2, 15)

1918

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

1919

runnable_hook, alphasort);

1920

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

1921

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

1922

alphasort);

1923

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

1924

#else /* not __GLIBC__ */

1925

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

1926

alphasort);

1927

#endif /* not __GLIBC__ */

1928

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1991

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1996

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

2065

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

2085

}

2086

2087

__attribute__((nonnull, warn_unused_result))

2088

error_t bring_up_interface(const char *const interface,

2089

const float delay){

2090

error_t old_errno = errno;

2091

int ret;

2092

struct ifreq network;

2093

unsigned int if_index = if_nametoindex(interface);

2094

if(if_index == 0){

2095

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

2096

errno = old_errno;

2097

return ENXIO;

2098

}

2099

2100

if(quit_now){

2101

errno = old_errno;

2102

return EINTR;

2103

}

2104

2105

if(not interface_is_up(interface)){

2106

error_t ret_errno = 0, 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

error_t take_down_interface(const char *const interface){

2216

error_t 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

error_t ret_errno = 0, ioctl_errno = 0;

2226

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

2227

ret_errno = errno;

2228

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

2229

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

2230

errno = old_errno;

2231

return ret_errno;

2232

}

2233

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

2234

2235

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

2236

if(sd == -1){

2237

ret_errno = errno;

2238

perror_plus("socket");

2239

errno = old_errno;

2240

return ret_errno;

2241

}

2242

2243

if(debug){

2244

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

2245

interface);

2246

}

2247

2248

/* Raise privileges */

2249

ret_errno = raise_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to raise privileges");

2253

}

2254

2255

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

2256

ioctl_errno = errno;

2257

2258

/* If raise_privileges() succeeded above */

2259

if(ret_errno == 0){

2260

/* Lower privileges */

2261

ret_errno = lower_privileges();

2262

if(ret_errno != 0){

2263

errno = ret_errno;

2264

perror_plus("Failed to lower privileges");

2265

}

2266

}

2267

2268

/* Close the socket */

2269

int ret = close(sd);

2270

if(ret == -1){

2271

perror_plus("close");

2272

}

2273

2274

if(ret_setflags == -1){

2275

errno = ioctl_errno;

2276

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2277

errno = old_errno;

2278

return ioctl_errno;

2279

}

2280

} else if(debug){

2281

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

2282

interface);

2283

}

2284

2285

errno = old_errno;

2286

return 0;

2287

}

2288

1407

2289

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

2290

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

2291

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

2292

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

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

1408

2295

AvahiSServiceBrowser *sb = NULL;

1409

int error;

2296

error_t ret_errno;

1410

2297

int ret;

1411

2298

intmax_t tmpmax;

1412

2299

char *tmp;

1413

2300

int exitcode = EXIT_SUCCESS;

1414

const char *interface = "";

1415

struct ifreq network;

1416

int sd = -1;

1417

bool take_down_interface = false;

1418

uid_t uid;

1419

gid_t gid;

1420

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

1421

bool tempdir_created = false;

2301

char *interfaces_to_take_down = NULL;

2302

size_t interfaces_to_take_down_size = 0;

2303

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

2304

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

2305

char *tempdir = NULL;

1422

2306

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1423

2307

const char *seckey = PATHDIR "/" SECKEY;

1424

2308

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

2310

char *interfaces_hooks = NULL;

1425

2311

1426

2312

bool gnutls_initialized = false;

1427

2313

bool gpgme_initialized = false;

1479

2365

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

1480

2366

" Diffie-Hellman key exchange",

1481

2367

.group = 2 },

2368

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

2369

.arg = "FILE",

2370

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

2371

" for the Diffie-Hellman key exchange",

2372

.group = 2 },

1482

2373

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

1483

2374

.arg = "STRING",

1484

2375

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

1489

2380

.group = 2 },

1490

2381

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

1491

2382

.arg = "SECONDS",

1492

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

2383

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

1493

2384

.group = 2 },

1494

2385

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

1495

2386

.arg = "DIR",

1518

2409

connect_to = arg;

1519

2410

break;

1520

2411

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

1521

interface = arg;

2412

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

2413

arg, (int)',');

2414

if(ret_errno != 0){

2415

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

2416

}

1522

2417

break;

1523

2418

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

1524

2419

seckey = arg;

1535

2430

}

1536

2431

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

1537

2432

break;

2433

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

2434

dh_params_file = arg;

2435

break;

1538

2436

case 130: /* --priority */

1539

2437

mc.priority = arg;

1540

2438

break;

1567

2465

argp_state_help(state, state->out_stream,

1568

2466

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1569

2467

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

1570

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1571

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

2468

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

1572

2469

exit(argp_err_exit_status);

1573

2470

break;

1574

2471

default:

1597

2494

goto end;

1598

2495

}

1599

2496

}

1600

2497

1601

2498

{

1602

2499

/* Work around Debian bug #633582:

1603

2500

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

1604

struct stat st;

1605

1606

/* Re-raise priviliges */

1607

errno = 0;

1608

ret = seteuid(0);

1609

if(ret == -1){

1610

perror_plus("seteuid");

1611

}

1612

1613

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

1614

int seckey_fd = open(seckey, O_RDONLY);

1615

if(seckey_fd == -1){

1616

perror_plus("open");

1617

} else {

1618

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

1619

if(ret == -1){

1620

perror_plus("fstat");

1621

} else {

1622

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

1623

ret = fchown(seckey_fd, uid, gid);

1624

if(ret == -1){

1625

perror_plus("fchown");

1626

}

1627

}

1628

}

1629

TEMP_FAILURE_RETRY(close(seckey_fd));

1630

}

1631

}

1632

1633

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

1634

int pubkey_fd = open(pubkey, O_RDONLY);

1635

if(pubkey_fd == -1){

1636

perror_plus("open");

1637

} else {

1638

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

1639

if(ret == -1){

1640

perror_plus("fstat");

1641

} else {

1642

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

1643

ret = fchown(pubkey_fd, uid, gid);

1644

if(ret == -1){

1645

perror_plus("fchown");

1646

}

1647

}

1648

}

1649

TEMP_FAILURE_RETRY(close(pubkey_fd));

1650

}

1651

}

1652

1653

/* Lower privileges */

1654

errno = 0;

1655

ret = seteuid(uid);

1656

if(ret == -1){

1657

perror_plus("seteuid");

1658

}

1659

}

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

2501

2502

/* Re-raise privileges */

2503

ret_errno = raise_privileges();

2504

if(ret_errno != 0){

2505

errno = ret_errno;

2506

perror_plus("Failed to raise privileges");

1669

2507

} else {

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

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

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

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

1725

"Warning: network hook \"%s\" exited"

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

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

1733

"Warning: network hook \"%s\" died by"

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

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

1740

"Warning: network hook \"%s\" crashed\n",

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1752

}

2508

struct stat st;

2509

2510

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

2511

int seckey_fd = open(seckey, O_RDONLY);

2512

if(seckey_fd == -1){

2513

perror_plus("open");

2514

} else {

2515

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

2516

if(ret == -1){

2517

perror_plus("fstat");

2518

} else {

2519

if(S_ISREG(st.st_mode)

2520

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

2521

ret = fchown(seckey_fd, uid, gid);

2522

if(ret == -1){

2523

perror_plus("fchown");

2524

}

2525

}

2526

}

2527

close(seckey_fd);

2528

}

2529

}

2530

2531

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

2532

int pubkey_fd = open(pubkey, O_RDONLY);

2533

if(pubkey_fd == -1){

2534

perror_plus("open");

2535

} else {

2536

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

2537

if(ret == -1){

2538

perror_plus("fstat");

2539

} else {

2540

if(S_ISREG(st.st_mode)

2541

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

2542

ret = fchown(pubkey_fd, uid, gid);

2543

if(ret == -1){

2544

perror_plus("fchown");

2545

}

2546

}

2547

}

2548

close(pubkey_fd);

2549

}

2550

}

2551

2552

if(dh_params_file != NULL

2553

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

2554

int dhparams_fd = open(dh_params_file, O_RDONLY);

2555

if(dhparams_fd == -1){

2556

perror_plus("open");

2557

} else {

2558

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

2559

if(ret == -1){

2560

perror_plus("fstat");

2561

} else {

2562

if(S_ISREG(st.st_mode)

2563

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

2564

ret = fchown(dhparams_fd, uid, gid);

2565

if(ret == -1){

2566

perror_plus("fchown");

2567

}

2568

}

2569

}

2570

close(dhparams_fd);

2571

}

2572

}

2573

2574

/* Lower privileges */

2575

ret_errno = lower_privileges();

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to lower privileges");

2579

}

2580

}

2581

}

2582

2583

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

2584

{

2585

char *interface = NULL;

2586

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

2587

interface))){

2588

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

2589

and if_nametoindex(interface) == 0){

2590

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

2591

fprintf_plus(stderr, "Not using nonexisting interface"

2592

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

2593

}

2594

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

2595

interface = NULL;

2596

}

2597

}

2598

}

2599

2600

/* Run network hooks */

2601

{

2602

if(mc.interfaces != NULL){

2603

interfaces_hooks = malloc(mc.interfaces_size);

2604

if(interfaces_hooks == NULL){

2605

perror_plus("malloc");

2606

goto end;

2607

}

2608

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

2609

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

2610

}

2611

run_network_hooks("start", interfaces_hooks != NULL ?

2612

interfaces_hooks : "", delay);

1753

2613

}

1754

2614

1755

2615

if(not debug){

1756

2616

avahi_set_log_function(empty_log);

1757

2617

}

1758

2618

1759

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

1760

struct dirent **direntries;

1761

/* First look for interfaces that are up */

1762

ret = scandir(sys_class_net, &direntries, up_interface,

1763

alphasort);

1764

if(ret == 0){

1765

/* No up interfaces, look for any good interfaces */

1766

free(direntries);

1767

ret = scandir(sys_class_net, &direntries, good_interface,

1768

alphasort);

1769

}

1770

if(ret >= 1){

1771

/* Pick the first interface returned */

1772

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

1773

if(debug){

1774

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

1775

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

1776

}

1777

if(interface == NULL){

1778

perror_plus("malloc");

1779

free(direntries);

1780

exitcode = EXIT_FAILURE;

1781

goto end;

1782

}

1783

free(direntries);

1784

} else {

1785

free(direntries);

1786

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

1787

"Could not find a network interface\n");

1788

exitcode = EXIT_FAILURE;

1789

goto end;

1790

}

1791

}

1792

1793

2619

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

1794

2620

from the signal handler */

1795

2621

/* Initialize the pseudo-RNG for Avahi */

1796

2622

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

1797

mc.simple_poll = avahi_simple_poll_new();

1798

if(mc.simple_poll == NULL){

1799

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

1800

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

2623

simple_poll = avahi_simple_poll_new();

2624

if(simple_poll == NULL){

2625

fprintf_plus(stderr,

2626

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

1801

2627

exitcode = EX_UNAVAILABLE;

1802

2628

goto end;

1803

2629

}

1865

2691

}

1866

2692

}

1867

2693

1868

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

1869

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

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1871

if(if_index == 0){

1872

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

1873

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

1874

exitcode = EX_UNAVAILABLE;

1875

goto end;

1876

}

1877

1878

if(quit_now){

1879

goto end;

1880

}

1881

1882

/* Re-raise priviliges */

1883

errno = 0;

1884

ret = seteuid(0);

1885

if(ret == -1){

1886

perror_plus("seteuid");

1887

}

1888

1889

#ifdef __linux__

1890

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1891

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

1892

ret = klogctl(8, NULL, 5);

1893

bool restore_loglevel = true;

1894

if(ret == -1){

1895

restore_loglevel = false;

1896

perror_plus("klogctl");

1897

}

1898

#endif /* __linux__ */

1899

1900

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1901

if(sd < 0){

1902

perror_plus("socket");

1903

exitcode = EX_OSERR;

1904

#ifdef __linux__

1905

if(restore_loglevel){

1906

ret = klogctl(7, NULL, 0);

1907

if(ret == -1){

1908

perror_plus("klogctl");

1909

}

1910

}

1911

#endif /* __linux__ */

1912

/* Lower privileges */

1913

errno = 0;

1914

ret = seteuid(uid);

1915

if(ret == -1){

1916

perror_plus("seteuid");

1917

}

1918

goto end;

1919

}

1920

strcpy(network.ifr_name, interface);

1921

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

1922

if(ret == -1){

1923

perror_plus("ioctl SIOCGIFFLAGS");

1924

#ifdef __linux__

1925

if(restore_loglevel){

1926

ret = klogctl(7, NULL, 0);

1927

if(ret == -1){

1928

perror_plus("klogctl");

1929

}

1930

}

1931

#endif /* __linux__ */

1932

exitcode = EX_OSERR;

1933

/* Lower privileges */

1934

errno = 0;

1935

ret = seteuid(uid);

1936

if(ret == -1){

1937

perror_plus("seteuid");

1938

}

1939

goto end;

1940

}

1941

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

1942

network.ifr_flags |= IFF_UP;

1943

take_down_interface = true;

1944

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

1945

if(ret == -1){

1946

take_down_interface = false;

1947

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1948

exitcode = EX_OSERR;

1949

#ifdef __linux__

1950

if(restore_loglevel){

1951

ret = klogctl(7, NULL, 0);

1952

if(ret == -1){

1953

perror_plus("klogctl");

2694

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

2695

if(mc.interfaces == NULL){

2696

struct dirent **direntries = NULL;

2697

/* Look for any good interfaces */

2698

ret = scandir(sys_class_net, &direntries, good_interface,

2699

alphasort);

2700

if(ret >= 1){

2701

/* Add all found interfaces to interfaces list */

2702

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

2703

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

2704

direntries[i]->d_name);

2705

if(ret_errno != 0){

2706

errno = ret_errno;

2707

perror_plus("argz_add");

2708

free(direntries[i]);

2709

continue;

2710

}

2711

if(debug){

2712

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

2713

direntries[i]->d_name);

2714

}

2715

free(direntries[i]);

2716

}

2717

free(direntries);

2718

} else {

2719

if(ret == 0){

2720

free(direntries);

2721

}

2722

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

2723

exitcode = EXIT_FAILURE;

2724

goto end;

2725

}

2726

}

2727

2728

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

2729

{

2730

char *interface = NULL;

2731

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

2732

interface))){

2733

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

2734

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

2735

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

2736

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

2737

interface);

2738

interface = NULL;

2739

while((interface = argz_next(mc.interfaces,

2740

mc.interfaces_size, interface))){

2741

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

2742

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

2743

interface);

2744

interface = NULL;

1954

2745

}

1955

2746

}

1956

#endif /* __linux__ */

1957

/* Lower privileges */

1958

errno = 0;

1959

ret = seteuid(uid);

1960

if(ret == -1){

1961

perror_plus("seteuid");

1962

}

1963

goto end;

1964

}

1965

}

1966

/* Sleep checking until interface is running.

1967

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

1968

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

1969

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

1970

if(ret == -1){

1971

perror_plus("ioctl SIOCGIFFLAGS");

1972

} else if(network.ifr_flags & IFF_RUNNING){

1973

2747

break;

1974

2748

}

1975

struct timespec sleeptime = { .tv_nsec = 250000000 };

1976

ret = nanosleep(&sleeptime, NULL);

1977

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

1978

perror_plus("nanosleep");

1979

}

1980

}

1981

if(not take_down_interface){

1982

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

1983

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

1984

if(ret == -1){

1985

perror_plus("close");

1986

}

1987

}

1988

#ifdef __linux__

1989

if(restore_loglevel){

1990

/* Restores kernel loglevel to default */

1991

ret = klogctl(7, NULL, 0);

1992

if(ret == -1){

1993

perror_plus("klogctl");

1994

}

1995

}

1996

#endif /* __linux__ */

1997

/* Lower privileges */

1998

errno = 0;

1999

if(take_down_interface){

2000

/* Lower privileges */

2001

ret = seteuid(uid);

2002

if(ret == -1){

2003

perror_plus("seteuid");

2004

}

2005

} else {

2006

/* Lower privileges permanently */

2007

ret = setuid(uid);

2008

if(ret == -1){

2009

perror_plus("setuid");

2010

}

2011

}

2749

bool interface_was_up = interface_is_up(interface);

2750

errno = bring_up_interface(interface, delay);

2751

if(not interface_was_up){

2752

if(errno != 0){

2753

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

2754

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

2755

} else {

2756

errno = argz_add(&interfaces_to_take_down,

2757

&interfaces_to_take_down_size,

2758

interface);

2759

if(errno != 0){

2760

perror_plus("argz_add");

2761

}

2762

}

2763

}

2764

}

2765

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

2766

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

2767

}

2768

}

2769

2770

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

2771

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

2772

if(debug){

2773

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

2774

mc.interfaces);

2775

}

2776

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

2012

2777

}

2013

2778

2014

2779

if(quit_now){

2015

2780

goto end;

2016

2781

}

2017

2782

2018

ret = init_gnutls_global(pubkey, seckey);

2783

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

2019

2784

if(ret == -1){

2020

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

2021

"init_gnutls_global failed\n");

2785

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

2022

2786

exitcode = EX_UNAVAILABLE;

2023

2787

goto end;

2024

2788

} else {

2029

2793

goto end;

2030

2794

}

2031

2795

2032

if(mkdtemp(tempdir) == NULL){

2796

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

2797

tempdir = mkdtemp(run_tempdir);

2798

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

2799

if(debug){

2800

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

2801

run_tempdir, old_tempdir);

2802

}

2803

tempdir = mkdtemp(old_tempdir);

2804

}

2805

if(tempdir == NULL){

2033

2806

perror_plus("mkdtemp");

2034

2807

goto end;

2035

2808

}

2036

tempdir_created = true;

2037

2809

2038

2810

if(quit_now){

2039

2811

goto end;

2040

2812

}

2041

2813

2042

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

2043

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

2044

"init_gpgme failed\n");

2814

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

2815

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

2045

2816

exitcode = EX_UNAVAILABLE;

2046

2817

goto end;

2047

2818

} else {

2056

2827

/* Connect directly, do not use Zeroconf */

2057

2828

/* (Mainly meant for debugging) */

2058

2829

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

2830

2059

2831

if(address == NULL){

2060

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

2061

"No colon in address\n");

2832

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

2062

2833

exitcode = EX_USAGE;

2063

2834

goto end;

2064

2835

}

2067

2838

goto end;

2068

2839

}

2069

2840

2070

uint16_t port;

2841

in_port_t port;

2071

2842

errno = 0;

2072

2843

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

2073

2844

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

2074

or tmpmax != (uint16_t)tmpmax){

2075

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

2076

"Bad port number\n");

2845

or tmpmax != (in_port_t)tmpmax){

2846

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

2077

2847

exitcode = EX_USAGE;

2078

2848

goto end;

2079

2849

}

2080

2850

2081

2851

if(quit_now){

2082

2852

goto end;

2083

2853

}

2084

2854

2085

port = (uint16_t)tmpmax;

2855

port = (in_port_t)tmpmax;

2086

2856

*address = '\0';

2087

2857

/* Colon in address indicates IPv6 */

2088

2858

int af;

2104

2874

}

2105

2875

2106

2876

while(not quit_now){

2107

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

2877

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

2878

&mc);

2108

2879

if(quit_now or ret == 0){

2109

2880

break;

2110

2881

}

2111

2882

if(debug){

2112

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

2113

"Retrying in %d seconds\n", (int)retry_interval);

2883

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

2884

(int)retry_interval);

2114

2885

}

2115

sleep((int)retry_interval);

2886

sleep((unsigned int)retry_interval);

2116

2887

}

2117

2888

2118

if (not quit_now){

2889

if(not quit_now){

2119

2890

exitcode = EXIT_SUCCESS;

2120

2891

}

2121

2892

2136

2907

config.publish_domain = 0;

2137

2908

2138

2909

/* Allocate a new server */

2139

mc.server = avahi_server_new(avahi_simple_poll_get

2140

(mc.simple_poll), &config, NULL,

2141

NULL, &error);

2910

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2911

&config, NULL, NULL, &ret_errno);

2142

2912

2143

2913

/* Free the Avahi configuration data */

2144

2914

avahi_server_config_free(&config);

2146

2916

2147

2917

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

2148

2918

if(mc.server == NULL){

2149

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

2150

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

2151

avahi_strerror(error));

2919

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

2920

avahi_strerror(ret_errno));

2152

2921

exitcode = EX_UNAVAILABLE;

2153

2922

goto end;

2154

2923

}

2160

2929

/* Create the Avahi service browser */

2161

2930

sb = avahi_s_service_browser_new(mc.server, if_index,

2162

2931

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2163

NULL, 0, browse_callback, NULL);

2932

NULL, 0, browse_callback,

2933

(void *)&mc);

2164

2934

if(sb == NULL){

2165

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

2166

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

2167

avahi_strerror(avahi_server_errno(mc.server)));

2935

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

2936

avahi_strerror(avahi_server_errno(mc.server)));

2168

2937

exitcode = EX_UNAVAILABLE;

2169

2938

goto end;

2170

2939

}

2176

2945

/* Run the main loop */

2177

2946

2178

2947

if(debug){

2179

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

2180

"Starting Avahi loop search\n");

2948

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

2181

2949

}

2182

2183

ret = avahi_loop_with_timeout(mc.simple_poll,

2184

(int)(retry_interval * 1000));

2950

2951

ret = avahi_loop_with_timeout(simple_poll,

2952

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

2185

2953

if(debug){

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

2188

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

2954

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

2955

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

2189

2956

}

2190

2957

2191

2958

end:

2192

2959

2193

2960

if(debug){

2194

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

2195

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

2961

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

2196

2962

}

2197

2963

2198

2964

/* Cleanup things */

2965

free(mc.interfaces);

2966

2199

2967

if(sb != NULL)

2200

2968

avahi_s_service_browser_free(sb);

2201

2969

2202

2970

if(mc.server != NULL)

2203

2971

avahi_server_free(mc.server);

2204

2972

2205

if(mc.simple_poll != NULL)

2206

avahi_simple_poll_free(mc.simple_poll);

2973

if(simple_poll != NULL)

2974

avahi_simple_poll_free(simple_poll);

2207

2975

2208

2976

if(gnutls_initialized){

2209

2977

gnutls_certificate_free_credentials(mc.cred);

2214

2982

if(gpgme_initialized){

2215

2983

gpgme_release(mc.ctx);

2216

2984

}

2217

2985

2218

2986

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

2219

2987

has seen */

2220

2988

if(mc.current_server != NULL){

2221

2989

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

2222

2990

while(mc.current_server != NULL){

2223

2991

server *next = mc.current_server->next;

2992

#ifdef __GNUC__

2993

#pragma GCC diagnostic push

2994

#pragma GCC diagnostic ignored "-Wcast-qual"

2995

#endif

2996

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

2997

#ifdef __GNUC__

2998

#pragma GCC diagnostic pop

2999

#endif

2224

3000

free(mc.current_server);

2225

3001

mc.current_server = next;

2226

3002

}

2227

3003

}

2228

3004

2229

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

2230

2231

/* Take down the network interface */

2232

if(take_down_interface){

2233

/* Re-raise priviliges */

2234

errno = 0;

2235

ret = seteuid(0);

2236

if(ret == -1){

2237

perror_plus("seteuid");

3005

/* Re-raise privileges */

3006

{

3007

ret_errno = raise_privileges();

3008

if(ret_errno != 0){

3009

errno = ret_errno;

3010

perror_plus("Failed to raise privileges");

3011

} else {

3012

3013

/* Run network hooks */

3014

run_network_hooks("stop", interfaces_hooks != NULL ?

3015

interfaces_hooks : "", delay);

3016

3017

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

3018

{

3019

char *interface = NULL;

3020

while((interface=argz_next(interfaces_to_take_down,

3021

interfaces_to_take_down_size,

3022

interface))){

3023

ret_errno = take_down_interface(interface);

3024

if(ret_errno != 0){

3025

errno = ret_errno;

3026

perror_plus("Failed to take down interface");

3027

}

3028

}

3029

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

3030

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

3031

" down\n");

3032

}

3033

}

2238

3034

}

2239

if(geteuid() == 0){

2240

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

2241

if(ret == -1){

2242

perror_plus("ioctl SIOCGIFFLAGS");

2243

} else if(network.ifr_flags & IFF_UP){

2244

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

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2248

}

2249

}

2250

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

2251

if(ret == -1){

2252

perror_plus("close");

2253

}

2254

/* Lower privileges permanently */

2255

errno = 0;

2256

ret = setuid(uid);

2257

if(ret == -1){

2258

perror_plus("setuid");

2259

}

3035

3036

ret_errno = lower_privileges_permanently();

3037

if(ret_errno != 0){

3038

errno = ret_errno;

3039

perror_plus("Failed to lower privileges permanently");

2260

3040

}

2261

3041

}

2262

3042

3043

free(interfaces_to_take_down);

3044

free(interfaces_hooks);

3045

2263

3046

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

2264

if(tempdir_created){

3047

if(tempdir != NULL){

2265

3048

struct dirent **direntries = NULL;

2266

struct dirent *direntry = NULL;

2267

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

2268

alphasort);

2269

if (numentries > 0){

2270

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

2271

direntry = direntries[i];

2272

char *fullname = NULL;

2273

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

2274

direntry->d_name);

2275

if(ret < 0){

2276

perror_plus("asprintf");

2277

continue;

2278

}

2279

ret = remove(fullname);

2280

if(ret == -1){

2281

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

2282

"remove(\"%s\"): %s\n", fullname, strerror(errno));

2283

}

2284

free(fullname);

3049

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

3050

| O_NOFOLLOW

3051

| O_DIRECTORY

3052

| O_PATH));

3053

if(tempdir_fd == -1){

3054

perror_plus("open");

3055

} else {

3056

#ifdef __GLIBC__

3057

#if __GLIBC_PREREQ(2, 15)

3058

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

3059

notdotentries, alphasort);

3060

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

3061

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

3062

alphasort);

3063

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

3064

#else /* not __GLIBC__ */

3065

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

3066

alphasort);

3067

#endif /* not __GLIBC__ */

3068

if(numentries >= 0){

3069

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

3070

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

3071

if(ret == -1){

3072

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

3073

" \"%s\", 0): %s\n", tempdir,

3074

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

3075

}

3076

free(direntries[i]);

3077

}

3078

3079

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

3080

free(direntries);

3081

if(numentries == -1){

3082

perror_plus("scandir");

3083

}

3084

ret = rmdir(tempdir);

3085

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

3086

perror_plus("rmdir");

3087

}

2285

3088

}

2286

}

2287

2288

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

2289

free(direntries);

2290

if (numentries == -1){

2291

perror_plus("scandir");

2292

}

2293

ret = rmdir(tempdir);

2294

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

2295

perror_plus("rmdir");

3089

close(tempdir_fd);

2296

3090

}

2297

3091

}

2298

3092