/mandos/release : revision 237.7.299

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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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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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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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118

init_gnutls_session(),

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119

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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151

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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162

AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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164

unsigned int dh_bits;

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166

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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}

197

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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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*/

203

__attribute__((nonnull, warn_unused_result))

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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){

182

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

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if(buffer == NULL){

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

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*buffer = NULL;

184

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return 0;

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214

}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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217

}

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return buffer_capacity;

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219

}

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220

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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))

223

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

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int af, server **current_server){

195

225

int ret;

196

226

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

197

227

if(new_server == NULL){

198

228

perror_plus("malloc");

199

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){

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perror_plus("strdup");

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return -1;

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free(new_server);

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return false;

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}

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

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if(ret == -1){

242

perror_plus("clock_gettime");

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#ifdef __GNUC__

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#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

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#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

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return false;

208

253

}

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/* Special case of first server */

210

if (mc.current_server == NULL){

255

if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

213

mc.current_server = new_server;

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

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*current_server = new_server;

215

259

} else {

216

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;

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

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new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

264

(*current_server)->prev = new_server;

265

}

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return true;

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267

}

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229

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/*

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* Initialize GPGME.

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*/

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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

*/

241

bool import_key(const char *filename){

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bool import_key(const char * const filename){

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284

int ret;

243

285

int fd;

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286

gpgme_data_t pgp_data;

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293

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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}

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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);

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if(rc != GPG_ERR_NO_ERROR){

261

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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305

return false;

264

306

}

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307

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314

}

273

315

274

316

if(debug){

275

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

317

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

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}

277

319

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320

/* Init GPGME */

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gpgme_check_version(NULL);

280

322

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

323

if(rc != GPG_ERR_NO_ERROR){

282

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

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gpgme_strsource(rc), gpgme_strerror(rc));

324

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

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gpgme_strsource(rc), gpgme_strerror(rc));

284

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return false;

285

327

}

286

328

287

329

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

288

330

rc = gpgme_get_engine_info(&engine_info);

289

331

if(rc != GPG_ERR_NO_ERROR){

290

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

291

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));

292

334

return false;

293

335

}

294

336

while(engine_info != NULL){

300

342

engine_info = engine_info->next;

301

343

}

302

344

if(engine_info == NULL){

303

fprintf(stderr, "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);

304

347

return false;

305

348

}

306

349

307

350

/* Create new GPGME "context" */

308

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

351

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

309

352

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), 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));

312

356

return false;

313

357

}

314

358

323

367

* Decrypt OpenPGP data.

324

368

* Returns -1 on error

325

369

*/

370

__attribute__((nonnull, warn_unused_result))

326

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

327

372

size_t crypto_size,

328

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

329

375

gpgme_data_t dh_crypto, dh_plain;

330

376

gpgme_error_t rc;

331

377

ssize_t ret;

333

379

ssize_t plaintext_length = 0;

334

380

335

381

if(debug){

336

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

382

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

337

383

}

338

384

339

385

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

340

386

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

387

0);

342

388

if(rc != GPG_ERR_NO_ERROR){

343

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

344

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));

345

391

return -1;

346

392

}

347

393

348

394

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

349

395

rc = gpgme_data_new(&dh_plain);

350

396

if(rc != GPG_ERR_NO_ERROR){

351

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

352

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));

353

400

gpgme_data_release(dh_crypto);

354

401

return -1;

355

402

}

356

403

357

404

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

358

405

data buffer */

359

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

406

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

360

407

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

363

410

plaintext_length = -1;

364

411

if(debug){

365

412

gpgme_decrypt_result_t result;

366

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

367

414

if(result == NULL){

368

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

415

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

369

416

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

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);

374

421

if(result->file_name != NULL){

375

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

422

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

376

423

}

377

424

gpgme_recipient_t recipient;

378

425

recipient = result->recipients;

379

426

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "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");

386

434

recipient = recipient->next;

387

435

}

388

436

}

391

439

}

392

440

393

441

if(debug){

394

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

442

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

395

443

}

396

444

397

445

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

404

452

*plaintext = NULL;

405

453

while(true){

406

454

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

455

(size_t)plaintext_length,

456

plaintext_capacity);

409

457

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

413

461

}

414

462

415

463

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

476

}

429

477

430

478

if(debug){

431

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

479

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

432

480

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

433

481

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

434

482

}

445

493

return plaintext_length;

446

494

}

447

495

448

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

451

if(ret == NULL)

452

ret = "(unknown)";

453

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);

454

507

}

455

508

456

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

457

511

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

458

512

const char* string){

459

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

513

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

460

514

}

461

515

516

__attribute__((nonnull, warn_unused_result))

462

517

static int init_gnutls_global(const char *pubkeyfilename,

463

const char *seckeyfilename){

518

const char *seckeyfilename,

519

mandos_context *mc){

464

520

int ret;

521

unsigned int uret;

465

522

466

523

if(debug){

467

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

524

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

468

525

}

469

526

470

527

ret = gnutls_global_init();

471

528

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

529

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

530

safer_gnutls_strerror(ret));

474

531

return -1;

475

532

}

476

533

483

540

}

484

541

485

542

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

487

544

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

490

547

gnutls_global_deinit();

491

548

return -1;

492

549

}

493

550

494

551

if(debug){

495

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

496

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

497

seckeyfilename);

552

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

553

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

554

pubkeyfilename,

555

seckeyfilename);

498

556

}

499

557

500

558

ret = gnutls_certificate_set_openpgp_key_file

501

(mc.cred, pubkeyfilename, seckeyfilename,

559

(mc->cred, pubkeyfilename, seckeyfilename,

502

560

GNUTLS_OPENPGP_FMT_BASE64);

503

561

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

562

fprintf_plus(stderr,

563

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

564

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

565

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

566

safer_gnutls_strerror(ret));

509

567

goto globalfail;

510

568

}

511

569

512

570

/* GnuTLS server initialization */

513

ret = gnutls_dh_params_init(&mc.dh_params);

571

ret = gnutls_dh_params_init(&mc->dh_params);

514

572

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

573

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

574

" initialization: %s\n",

575

safer_gnutls_strerror(ret));

517

576

goto globalfail;

518

577

}

519

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

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

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

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

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

663

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

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

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

670

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

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

679

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

520

680

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

681

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

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

523

683

goto globalfail;

524

684

}

525

685

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

686

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

527

687

528

688

return 0;

529

689

530

690

globalfail:

531

691

532

gnutls_certificate_free_credentials(mc.cred);

692

gnutls_certificate_free_credentials(mc->cred);

533

693

gnutls_global_deinit();

534

gnutls_dh_params_deinit(mc.dh_params);

694

gnutls_dh_params_deinit(mc->dh_params);

535

695

return -1;

536

696

}

537

697

538

static int init_gnutls_session(gnutls_session_t *session){

698

__attribute__((nonnull, warn_unused_result))

699

static int init_gnutls_session(gnutls_session_t *session,

700

mandos_context *mc){

539

701

int ret;

540

702

/* GnuTLS session creation */

541

703

do {

545

707

}

546

708

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

547

709

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

710

fprintf_plus(stderr,

711

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

712

safer_gnutls_strerror(ret));

550

713

}

551

714

552

715

{

553

716

const char *err;

554

717

do {

555

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

718

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

556

719

if(quit_now){

557

720

gnutls_deinit(*session);

558

721

return -1;

559

722

}

560

723

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

561

724

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

725

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

726

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

727

safer_gnutls_strerror(ret));

565

728

gnutls_deinit(*session);

566

729

return -1;

567

730

}

569

732

570

733

do {

571

734

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

735

mc->cred);

573

736

if(quit_now){

574

737

gnutls_deinit(*session);

575

738

return -1;

576

739

}

577

740

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

578

741

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

742

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

743

safer_gnutls_strerror(ret));

581

744

gnutls_deinit(*session);

582

745

return -1;

583

746

}

585

748

/* ignore client certificate if any. */

586

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

587

750

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

589

752

590

753

return 0;

591

754

}

595

758

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

596

759

597

760

/* Called when a Mandos server is found */

598

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

761

__attribute__((nonnull, warn_unused_result))

762

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

599

763

AvahiIfIndex if_index,

600

int af){

764

int af, mandos_context *mc){

601

765

int ret, tcp_sd = -1;

602

766

ssize_t sret;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

767

struct sockaddr_storage to;

607

768

char *buffer = NULL;

608

769

char *decrypted_buffer = NULL;

609

770

size_t buffer_length = 0;

628

789

pf = PF_INET;

629

790

break;

630

791

default:

631

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

792

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

632

793

errno = EINVAL;

633

794

return -1;

634

795

}

635

796

636

ret = init_gnutls_session(&session);

797

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

798

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

799

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

800

bool match = false;

801

{

802

char *interface = NULL;

803

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

804

interface))){

805

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

806

match = true;

807

break;

808

}

809

}

810

}

811

if(not match){

812

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

813

connect to the server */

814

if(debug){

815

char interface[IF_NAMESIZE];

816

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

817

perror_plus("if_indextoname");

818

} else {

819

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

820

" \"%s\"\n",

821

if_indextoname((unsigned int)if_index,

822

interface));

823

}

824

}

825

return -1;

826

}

827

}

828

829

ret = init_gnutls_session(&session, mc);

637

830

if(ret != 0){

638

831

return -1;

639

832

}

640

833

641

834

if(debug){

642

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

643

"\n", ip, port);

835

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

836

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

644

837

}

645

838

646

839

tcp_sd = socket(pf, SOCK_STREAM, 0);

658

851

659

852

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

660

853

if(af == AF_INET6){

661

to.in6.sin6_family = (sa_family_t)af;

662

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

854

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

855

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

663

856

} else { /* IPv4 */

664

to.in.sin_family = (sa_family_t)af;

665

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

857

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

858

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

666

859

}

667

860

if(ret < 0 ){

668

861

int e = errno;

672

865

}

673

866

if(ret == 0){

674

867

int e = errno;

675

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

868

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

676

869

errno = e;

677

870

goto mandos_end;

678

871

}

679

872

if(af == AF_INET6){

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

687

876

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

877

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

878

" incomplete without a network interface\n");

690

879

errno = EINVAL;

691

880

goto mandos_end;

692

881

}

693

882

/* Set the network interface number as scope */

694

to.in6.sin6_scope_id = (uint32_t)if_index;

883

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

695

884

}

696

885

} else {

697

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

698

-Wconversion and

699

-Wunreachable-code */

886

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

700

887

}

701

888

702

889

if(quit_now){

710

897

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

711

898

perror_plus("if_indextoname");

712

899

} else {

713

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

714

ip, interface, port);

900

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

901

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

715

902

}

716

903

} else {

717

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

718

port);

904

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

905

ip, (uintmax_t)port);

719

906

}

720

907

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

908

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

722

const char *pcret;

723

909

if(af == AF_INET6){

724

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

725

sizeof(addrstr));

910

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

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

726

914

} else {

727

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

728

sizeof(addrstr));

915

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

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

729

919

}

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

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

734

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

735

}

920

if(ret == EAI_SYSTEM){

921

perror_plus("getnameinfo");

922

} else if(ret != 0) {

923

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

924

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

925

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

736

926

}

737

927

}

738

928

742

932

}

743

933

744

934

if(af == AF_INET6){

745

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

935

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

936

sizeof(struct sockaddr_in6));

746

937

} else {

747

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

938

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

939

sizeof(struct sockaddr_in));

748

940

}

749

941

if(ret < 0){

750

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

942

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

751

943

int e = errno;

752

944

perror_plus("connect");

753

945

errno = e;

765

957

while(true){

766

958

size_t out_size = strlen(out);

767

959

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

768

out_size - written));

960

out_size - written));

769

961

if(ret == -1){

770

962

int e = errno;

771

963

perror_plus("write");

791

983

}

792

984

793

985

if(debug){

794

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

986

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

795

987

}

796

988

797

989

if(quit_now){

799

991

goto mandos_end;

800

992

}

801

993

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

994

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

995

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

996

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

997

gnutls_transport_set_ptr(session,

998

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

999

805

1000

if(quit_now){

806

1001

errno = EINTR;

817

1012

818

1013

if(ret != GNUTLS_E_SUCCESS){

819

1014

if(debug){

820

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

1015

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

821

1016

gnutls_perror(ret);

822

1017

}

823

1018

errno = EPROTO;

827

1022

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

828

1023

829

1024

if(debug){

830

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

831

ip);

1025

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1026

" %s\n", ip);

832

1027

}

833

1028

834

1029

while(true){

839

1034

}

840

1035

841

1036

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

1037

buffer_capacity);

843

1038

if(buffer_capacity == 0){

844

1039

int e = errno;

845

1040

perror_plus("incbuffer");

872

1067

}

873

1068

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

874

1069

if(ret < 0){

875

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

1070

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

1071

"***\n");

876

1072

gnutls_perror(ret);

877

1073

errno = EPROTO;

878

1074

goto mandos_end;

879

1075

}

880

1076

break;

881

1077

default:

882

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

883

" encrypted session with Mandos server\n");

1078

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

1079

" encrypted session with Mandos server\n");

884

1080

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

1081

errno = EIO;

886

1082

goto mandos_end;

891

1087

}

892

1088

893

1089

if(debug){

894

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

1090

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

895

1091

}

896

1092

897

1093

if(quit_now){

909

1105

910

1106

if(buffer_length > 0){

911

1107

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

1108

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1109

&decrypted_buffer, mc);

915

1110

if(decrypted_buffer_size >= 0){

916

1111

917

1112

written = 0;

927

1122

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

928

1123

int e = errno;

929

1124

if(debug){

930

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

931

strerror(errno));

1125

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

1126

strerror(errno));

932

1127

}

933

1128

errno = e;

934

1129

goto mandos_end;

965

1160

return retval;

966

1161

}

967

1162

1163

__attribute__((nonnull))

968

1164

static void resolve_callback(AvahiSServiceResolver *r,

969

1165

AvahiIfIndex interface,

970

1166

AvahiProtocol proto,

978

1174

AVAHI_GCC_UNUSED AvahiStringList *txt,

979

1175

AVAHI_GCC_UNUSED AvahiLookupResultFlags

980

1176

flags,

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1177

void *mc){

1178

if(r == NULL){

1179

return;

1180

}

983

1181

984

1182

/* Called whenever a service has been resolved successfully or

985

1183

timed out */

986

1184

987

1185

if(quit_now){

1186

avahi_s_service_resolver_free(r);

988

1187

return;

989

1188

}

990

1189

991

1190

switch(event){

992

1191

default:

993

1192

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1193

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

1194

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

1195

domain,

1196

avahi_strerror(avahi_server_errno

1197

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

997

1198

break;

998

1199

999

1200

case AVAHI_RESOLVER_FOUND:

1001

1202

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1203

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

1003

1204

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1205

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

1206

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

1207

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

1007

1208

}

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1209

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

1210

interface,

1211

avahi_proto_to_af(proto),

1212

mc);

1010

1213

if(ret == 0){

1011

avahi_simple_poll_quit(mc.simple_poll);

1214

avahi_simple_poll_quit(simple_poll);

1012

1215

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1216

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

1217

avahi_proto_to_af(proto),

1218

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

1219

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

1220

" list\n", name);

1221

}

1015

1222

}

1016

1223

}

1017

1224

}

1027

1234

const char *domain,

1028

1235

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1029

1236

flags,

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1237

void *mc){

1238

if(b == NULL){

1239

return;

1240

}

1032

1241

1033

1242

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

1034

1243

is removed from the LAN */

1041

1250

default:

1042

1251

case AVAHI_BROWSER_FAILURE:

1043

1252

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1253

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

1254

avahi_strerror(avahi_server_errno

1255

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

1256

avahi_simple_poll_quit(simple_poll);

1047

1257

return;

1048

1258

1049

1259

case AVAHI_BROWSER_NEW:

1052

1262

the callback function is called the Avahi server will free the

1053

1263

resolver for us. */

1054

1264

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1265

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

1266

interface, protocol, name, type,

1267

domain, protocol, 0,

1268

resolve_callback, mc) == NULL)

1269

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

1270

" %s\n", name,

1271

avahi_strerror(avahi_server_errno

1272

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

1060

1273

break;

1061

1274

1062

1275

case AVAHI_BROWSER_REMOVE:

1065

1278

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1279

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1280

if(debug){

1068

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

1281

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

1282

" searching...\n");

1069

1283

}

1070

1284

break;

1071

1285

}

1080

1294

signal_received = sig;

1081

1295

int old_errno = errno;

1082

1296

/* set main loop to exit */

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1297

if(simple_poll != NULL){

1298

avahi_simple_poll_quit(simple_poll);

1085

1299

}

1086

1300

errno = old_errno;

1087

1301

}

1088

1302

1303

__attribute__((nonnull, warn_unused_result))

1089

1304

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

1090

1305

int ret;

1306

error_t ret_errno;

1091

1307

1092

1308

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

1093

1309

if(s < 0){

1310

ret_errno = errno;

1094

1311

perror_plus("socket");

1312

errno = ret_errno;

1095

1313

return false;

1096

1314

}

1097

1315

strcpy(ifr->ifr_name, ifname);

1098

1316

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

1317

if(ret == -1){

1100

1318

if(debug){

1319

ret_errno = errno;

1101

1320

perror_plus("ioctl SIOCGIFFLAGS");

1321

errno = ret_errno;

1102

1322

}

1103

1323

return false;

1104

1324

}

1105

1325

return true;

1106

1326

}

1107

1327

1328

__attribute__((nonnull, warn_unused_result))

1108

1329

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

1109

1330

1110

1331

/* Reject the loopback device */

1111

1332

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1333

if(debug){

1113

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

1114

ifname);

1334

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

1335

ifname);

1115

1336

}

1116

1337

return false;

1117

1338

}

1118

1339

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

1119

1340

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

1120

1341

if(debug){

1121

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

1122

ifname);

1342

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

1343

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

1123

1344

}

1124

1345

return true;

1125

1346

}

1126

1347

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

1127

1348

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

1128

1349

if(debug){

1129

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

1130

ifname);

1350

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1351

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

1131

1352

}

1132

1353

return false;

1133

1354

}

1134

1355

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

1135

1356

if(ifr->ifr_flags & IFF_NOARP){

1136

1357

if(debug){

1137

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

1358

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

1359

ifname);

1138

1360

}

1139

1361

return false;

1140

1362

}

1141

1363

1142

1364

/* Accept this device */

1143

1365

if(debug){

1144

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

1366

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

1145

1367

}

1146

1368

return true;

1147

1369

}

1151

1373

* corresponds to an acceptable network device.

1152

1374

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

1153

1375

*/

1376

__attribute__((nonnull, warn_unused_result))

1154

1377

int good_interface(const struct dirent *if_entry){

1155

1378

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

1156

1379

return 0;

1159

1382

struct ifreq ifr;

1160

1383

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

1161

1384

if(debug){

1162

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

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1385

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

1386

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

1387

}

1388

return 0;

1389

}

1390

1391

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

1392

return 0;

1393

}

1394

return 1;

1395

}

1396

1397

/*

1398

* This function determines if a network interface is up.

1399

*/

1400

__attribute__((nonnull, warn_unused_result))

1401

bool interface_is_up(const char *interface){

1402

struct ifreq ifr;

1403

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

1404

if(debug){

1405

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

1406

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

1407

}

1408

return false;

1409

}

1410

1411

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

1412

}

1413

1414

/*

1415

* This function determines if a network interface is running

1416

*/

1417

__attribute__((nonnull, warn_unused_result))

1418

bool interface_is_running(const char *interface){

1419

struct ifreq ifr;

1420

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

1421

if(debug){

1422

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

1423

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

1424

}

1425

return false;

1426

}

1427

1428

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

1429

}

1430

1431

__attribute__((nonnull, pure, warn_unused_result))

1217

1432

int notdotentries(const struct dirent *direntry){

1218

1433

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

1219

1434

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

1226

1441

}

1227

1442

1228

1443

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

1444

__attribute__((nonnull, warn_unused_result))

1229

1445

int runnable_hook(const struct dirent *direntry){

1230

1446

int ret;

1447

size_t sret;

1231

1448

struct stat st;

1232

1449

1233

1450

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

1235

1452

return 0;

1236

1453

}

1237

1454

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

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

1455

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

1456

"abcdefghijklmnopqrstuvwxyz"

1457

"0123456789"

1458

"_.-");

1459

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

1460

/* Contains non-allowed characters */

1461

if(debug){

1462

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

1463

direntry->d_name);

1464

}

1465

return 0;

1466

}

1467

1468

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

1255

1469

if(ret == -1){

1256

1470

if(debug){

1257

perror_plus("Could not stat plugin");

1471

perror_plus("Could not stat hook");

1258

1472

}

1259

1473

return 0;

1260

1474

}

1261

1475

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

1262

1476

/* Not a regular file */

1477

if(debug){

1478

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

1479

direntry->d_name);

1480

}

1263

1481

return 0;

1264

1482

}

1265

1483

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

1266

1484

/* Not executable */

1485

if(debug){

1486

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

1487

direntry->d_name);

1488

}

1267

1489

return 0;

1268

1490

}

1491

if(debug){

1492

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

1493

direntry->d_name);

1494

}

1269

1495

return 1;

1270

1496

}

1271

1497

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1498

__attribute__((nonnull, warn_unused_result))

1499

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1500

mandos_context *mc){

1273

1501

int ret;

1274

1502

struct timespec now;

1275

1503

struct timespec waited_time;

1276

1504

intmax_t block_time;

1277

1505

1278

1506

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1507

if(mc->current_server == NULL){

1508

if(debug){

1509

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

1510

" No timeout!\n");

1283

1511

}

1284

1512

ret = avahi_simple_poll_iterate(s, -1);

1285

1513

} else {

1286

if (debug){

1287

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

1288

" or wait\n");

1514

if(debug){

1515

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

1516

" it, or wait\n");

1289

1517

}

1290

1518

/* the current time */

1291

1519

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1296

1524

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

1297

1525

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

1298

1526

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1527

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

1300

1528

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1529

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

1302

1530

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

1303

1531

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

1304

1532

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

1306

1534

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

1307

1535

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

1308

1536

1309

if (debug){

1310

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

1537

if(debug){

1538

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

1539

block_time);

1311

1540

}

1312

1541

1313

1542

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1543

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

1544

mc->current_server->port,

1545

mc->current_server->if_index,

1546

mc->current_server->af, mc);

1318

1547

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1548

avahi_simple_poll_quit(s);

1320

1549

return 0;

1321

1550

}

1322

1551

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1552

&mc->current_server->last_seen);

1324

1553

if(ret == -1){

1325

1554

perror_plus("clock_gettime");

1326

1555

return -1;

1327

1556

}

1328

mc.current_server = mc.current_server->next;

1557

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

1329

1558

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

1330

1559

servers, but don't block */

1331

1560

}

1333

1562

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

1334

1563

}

1335

1564

if(ret != 0){

1336

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

1565

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

1337

1566

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

1338

1567

}

1339

1568

}

1340

1569

}

1341

1570

}

1342

1571

1572

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

1573

__attribute__((warn_unused_result))

1574

error_t raise_privileges(void){

1575

error_t old_errno = errno;

1576

error_t ret_errno = 0;

1577

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

1578

ret_errno = errno;

1579

}

1580

errno = old_errno;

1581

return ret_errno;

1582

}

1583

1584

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

1585

__attribute__((warn_unused_result))

1586

error_t raise_privileges_permanently(void){

1587

error_t old_errno = errno;

1588

error_t ret_errno = raise_privileges();

1589

if(ret_errno != 0){

1590

errno = old_errno;

1591

return ret_errno;

1592

}

1593

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

1594

ret_errno = errno;

1595

}

1596

errno = old_errno;

1597

return ret_errno;

1598

}

1599

1600

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

1601

__attribute__((warn_unused_result))

1602

error_t lower_privileges(void){

1603

error_t old_errno = errno;

1604

error_t ret_errno = 0;

1605

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

1606

ret_errno = errno;

1607

}

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1614

error_t lower_privileges_permanently(void){

1615

error_t old_errno = errno;

1616

error_t ret_errno = 0;

1617

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

1618

ret_errno = errno;

1619

}

1620

errno = old_errno;

1621

return ret_errno;

1622

}

1623

1624

__attribute__((nonnull))

1625

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

1626

const float delay){

1627

struct dirent **direntries = NULL;

1628

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1630

if(hookdir_fd == -1){

1631

if(errno == ENOENT){

1632

if(debug){

1633

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

1634

" found\n", hookdir);

1635

}

1636

} else {

1637

perror_plus("open");

1638

}

1639

return;

1640

}

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1644

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

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1654

if(numhooks == -1){

1655

perror_plus("scandir");

1656

return;

1657

}

1658

struct dirent *direntry;

1659

int ret;

1660

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

1661

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

1662

direntry = direntries[i];

1663

if(debug){

1664

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

1665

direntry->d_name);

1666

}

1667

pid_t hook_pid = fork();

1668

if(hook_pid == 0){

1669

/* Child */

1670

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1673

perror_plus("Failed to raise privileges");

1674

_exit(EX_NOPERM);

1675

}

1676

/* Set group */

1677

errno = 0;

1678

ret = setgid(0);

1679

if(ret == -1){

1680

perror_plus("setgid");

1681

_exit(EX_NOPERM);

1682

}

1683

/* Reset supplementary groups */

1684

errno = 0;

1685

ret = setgroups(0, NULL);

1686

if(ret == -1){

1687

perror_plus("setgroups");

1688

_exit(EX_NOPERM);

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1705

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

1706

if(ret == -1){

1707

perror_plus("setenv");

1708

_exit(EX_OSERR);

1709

}

1710

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

1711

if(ret == -1){

1712

perror_plus("setenv");

1713

_exit(EX_OSERR);

1714

}

1715

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

1716

if(ret == -1){

1717

perror_plus("setenv");

1718

_exit(EX_OSERR);

1719

}

1720

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

1721

if(ret == -1){

1722

perror_plus("setenv");

1723

_exit(EX_OSERR);

1724

}

1725

char *delaystring;

1726

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

1727

if(ret == -1){

1728

perror_plus("asprintf");

1729

_exit(EX_OSERR);

1730

}

1731

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

1732

if(ret == -1){

1733

free(delaystring);

1734

perror_plus("setenv");

1735

_exit(EX_OSERR);

1736

}

1737

free(delaystring);

1738

if(connect_to != NULL){

1739

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

1740

if(ret == -1){

1741

perror_plus("setenv");

1742

_exit(EX_OSERR);

1743

}

1744

}

1745

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

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

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

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

1755

environ) == -1){

1756

perror_plus("fexecve");

1757

_exit(EXIT_FAILURE);

1758

}

1759

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

int status;

1766

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

1767

perror_plus("waitpid");

1768

free(direntry);

1769

continue;

1770

}

1771

if(WIFEXITED(status)){

1772

if(WEXITSTATUS(status) != 0){

1773

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

1774

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

1775

WEXITSTATUS(status));

1776

free(direntry);

1777

continue;

1778

}

1779

} else if(WIFSIGNALED(status)){

1780

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

1781

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

1782

WTERMSIG(status));

1783

free(direntry);

1784

continue;

1785

} else {

1786

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

1787

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

1788

free(direntry);

1789

continue;

1790

}

1791

}

1792

if(debug){

1793

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

1794

direntry->d_name);

1795

}

1796

free(direntry);

1797

}

1798

free(direntries);

1799

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

1800

perror_plus("close");

1801

} else {

1802

hookdir_fd = -1;

1803

}

1804

close(devnull);

1805

}

1806

1807

__attribute__((nonnull, warn_unused_result))

1808

error_t bring_up_interface(const char *const interface,

1809

const float delay){

1810

error_t old_errno = errno;

1811

int ret;

1812

struct ifreq network;

1813

unsigned int if_index = if_nametoindex(interface);

1814

if(if_index == 0){

1815

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

1816

errno = old_errno;

1817

return ENXIO;

1818

}

1819

1820

if(quit_now){

1821

errno = old_errno;

1822

return EINTR;

1823

}

1824

1825

if(not interface_is_up(interface)){

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

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

1828

ret_errno = errno;

1829

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

1830

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

1831

errno = old_errno;

1832

return ret_errno;

1833

}

1834

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

1835

1836

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

1837

if(sd == -1){

1838

ret_errno = errno;

1839

perror_plus("socket");

1840

errno = old_errno;

1841

return ret_errno;

1842

}

1843

1844

if(quit_now){

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1849

errno = old_errno;

1850

return EINTR;

1851

}

1852

1853

if(debug){

1854

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

1855

interface);

1856

}

1857

1858

/* Raise privileges */

1859

ret_errno = raise_privileges();

1860

if(ret_errno != 0){

1861

errno = ret_errno;

1862

perror_plus("Failed to raise privileges");

1863

}

1864

1865

#ifdef __linux__

1866

int ret_linux;

1867

bool restore_loglevel = false;

1868

if(ret_errno == 0){

1869

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1870

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

1871

ret_linux = klogctl(8, NULL, 5);

1872

if(ret_linux == -1){

1873

perror_plus("klogctl");

1874

} else {

1875

restore_loglevel = true;

1876

}

1877

}

1878

#endif /* __linux__ */

1879

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

1880

ioctl_errno = errno;

1881

#ifdef __linux__

1882

if(restore_loglevel){

1883

ret_linux = klogctl(7, NULL, 0);

1884

if(ret_linux == -1){

1885

perror_plus("klogctl");

1886

}

1887

}

1888

#endif /* __linux__ */

1889

1890

/* If raise_privileges() succeeded above */

1891

if(ret_errno == 0){

1892

/* Lower privileges */

1893

ret_errno = lower_privileges();

1894

if(ret_errno != 0){

1895

errno = ret_errno;

1896

perror_plus("Failed to lower privileges");

1897

}

1898

}

1899

1900

/* Close the socket */

1901

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

1902

if(ret == -1){

1903

perror_plus("close");

1904

}

1905

1906

if(ret_setflags == -1){

1907

errno = ioctl_errno;

1908

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1909

errno = old_errno;

1910

return ioctl_errno;

1911

}

1912

} else if(debug){

1913

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

1914

interface);

1915

}

1916

1917

/* Sleep checking until interface is running.

1918

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

1919

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

1920

if(interface_is_running(interface)){

1921

break;

1922

}

1923

struct timespec sleeptime = { .tv_nsec = 250000000 };

1924

ret = nanosleep(&sleeptime, NULL);

1925

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

1926

perror_plus("nanosleep");

1927

}

1928

}

1929

1930

errno = old_errno;

1931

return 0;

1932

}

1933

1934

__attribute__((nonnull, warn_unused_result))

1935

error_t take_down_interface(const char *const interface){

1936

error_t old_errno = errno;

1937

struct ifreq network;

1938

unsigned int if_index = if_nametoindex(interface);

1939

if(if_index == 0){

1940

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

1941

errno = old_errno;

1942

return ENXIO;

1943

}

1944

if(interface_is_up(interface)){

1945

error_t ret_errno = 0, ioctl_errno = 0;

1946

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

1947

ret_errno = errno;

1948

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

1949

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

1950

errno = old_errno;

1951

return ret_errno;

1952

}

1953

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

1954

1955

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

1956

if(sd == -1){

1957

ret_errno = errno;

1958

perror_plus("socket");

1959

errno = old_errno;

1960

return ret_errno;

1961

}

1962

1963

if(debug){

1964

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

1965

interface);

1966

}

1967

1968

/* Raise privileges */

1969

ret_errno = raise_privileges();

1970

if(ret_errno != 0){

1971

errno = ret_errno;

1972

perror_plus("Failed to raise privileges");

1973

}

1974

1975

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

1976

ioctl_errno = errno;

1977

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1987

1988

/* Close the socket */

1989

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

1990

if(ret == -1){

1991

perror_plus("close");

1992

}

1993

1994

if(ret_setflags == -1){

1995

errno = ioctl_errno;

1996

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1997

errno = old_errno;

1998

return ioctl_errno;

1999

}

2000

} else if(debug){

2001

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

2002

interface);

2003

}

2004

2005

errno = old_errno;

2006

return 0;

2007

}

2008

1343

2009

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

2010

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

2011

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

2012

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2013

.interfaces = NULL, .interfaces_size = 0 };

1344

2014

AvahiSServiceBrowser *sb = NULL;

1345

int error;

2015

error_t ret_errno;

1346

2016

int ret;

1347

2017

intmax_t tmpmax;

1348

2018

char *tmp;

1349

2019

int exitcode = EXIT_SUCCESS;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1356

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

1357

bool tempdir_created = false;

2020

char *interfaces_to_take_down = NULL;

2021

size_t interfaces_to_take_down_size = 0;

2022

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

2023

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

2024

char *tempdir = NULL;

1358

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1359

2026

const char *seckey = PATHDIR "/" SECKEY;

1360

2027

const char *pubkey = PATHDIR "/" PUBKEY;

2028

char *interfaces_hooks = NULL;

1361

2029

1362

2030

bool gnutls_initialized = false;

1363

2031

bool gpgme_initialized = false;

1425

2093

.group = 2 },

1426

2094

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

1427

2095

.arg = "SECONDS",

1428

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

2096

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

2097

.group = 2 },

2098

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

2099

.arg = "DIR",

2100

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

1429

2101

.group = 2 },

1430

2102

/*

1431

2103

* These reproduce what we would get without ARGP_NO_HELP

1450

2122

connect_to = arg;

1451

2123

break;

1452

2124

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

1453

interface = arg;

2125

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

2126

arg, (int)',');

2127

if(ret_errno != 0){

2128

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

2129

}

1454

2130

break;

1455

2131

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

1456

2132

seckey = arg;

1485

2161

argp_error(state, "Bad retry interval");

1486

2162

}

1487

2163

break;

2164

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

2165

hookdir = arg;

2166

break;

1488

2167

/*

1489

2168

* These reproduce what we would get without ARGP_NO_HELP

1490

2169

*/

1496

2175

argp_state_help(state, state->out_stream,

1497

2176

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

2177

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

1499

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

2178

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

1500

2179

exit(argp_err_exit_status);

1501

2180

break;

1502

2181

default:

1529

2208

{

1530

2209

/* Work around Debian bug #633582:

1531

2210

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

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

setenv("DEVICE", interface, 1);

1612

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

1613

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

1614

/* setenv( XXX more here */

1615

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

1616

perror_plus("execl");

1617

}

1618

free(fullname);

1619

if(quit_now){

2211

2212

/* Re-raise privileges */

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2216

perror_plus("Failed to raise privileges");

2217

} else {

2218

struct stat st;

2219

2220

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

2221

int seckey_fd = open(seckey, O_RDONLY);

2222

if(seckey_fd == -1){

2223

perror_plus("open");

2224

} else {

2225

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

2226

if(ret == -1){

2227

perror_plus("fstat");

2228

} else {

2229

if(S_ISREG(st.st_mode)

2230

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

2231

ret = fchown(seckey_fd, uid, gid);

2232

if(ret == -1){

2233

perror_plus("fchown");

2234

}

2235

}

2236

}

2237

TEMP_FAILURE_RETRY(close(seckey_fd));

2238

}

2239

}

2240

2241

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

2242

int pubkey_fd = open(pubkey, O_RDONLY);

2243

if(pubkey_fd == -1){

2244

perror_plus("open");

2245

} else {

2246

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

2247

if(ret == -1){

2248

perror_plus("fstat");

2249

} else {

2250

if(S_ISREG(st.st_mode)

2251

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

2252

ret = fchown(pubkey_fd, uid, gid);

2253

if(ret == -1){

2254

perror_plus("fchown");

2255

}

2256

}

2257

}

2258

TEMP_FAILURE_RETRY(close(pubkey_fd));

2259

}

2260

}

2261

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

2269

}

2270

2271

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

2272

{

2273

char *interface = NULL;

2274

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

2275

interface))){

2276

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

2277

and if_nametoindex(interface) == 0){

2278

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

2279

fprintf_plus(stderr, "Not using nonexisting interface"

2280

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

2281

}

2282

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

2283

interface = NULL;

2284

}

2285

}

2286

}

2287

2288

/* Run network hooks */

2289

{

2290

if(mc.interfaces != NULL){

2291

interfaces_hooks = malloc(mc.interfaces_size);

2292

if(interfaces_hooks == NULL){

2293

perror_plus("malloc");

1620

2294

goto end;

1621

2295

}

2296

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

2297

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

1622

2298

}

1623

close(devnull);

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

1624

2301

}

1625

2302

1626

2303

if(not debug){

1627

2304

avahi_set_log_function(empty_log);

1628

2305

}

1629

2306

1630

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

1631

struct dirent **direntries;

1632

/* First look for interfaces that are up */

1633

ret = scandir(sys_class_net, &direntries, up_interface,

1634

alphasort);

1635

if(ret == 0){

1636

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

1637

free(direntries);

1638

ret = scandir(sys_class_net, &direntries, good_interface,

1639

alphasort);

1640

}

1641

if(ret >= 1){

1642

/* Pick the first interface returned */

1643

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

1644

if(debug){

1645

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

1646

}

1647

if(interface == NULL){

1648

perror_plus("malloc");

1649

free(direntries);

1650

exitcode = EXIT_FAILURE;

1651

goto end;

1652

}

1653

free(direntries);

1654

} else {

1655

free(direntries);

1656

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

1657

exitcode = EXIT_FAILURE;

1658

goto end;

1659

}

1660

}

1661

1662

2307

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

1663

2308

from the signal handler */

1664

2309

/* Initialize the pseudo-RNG for Avahi */

1665

2310

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

1666

mc.simple_poll = avahi_simple_poll_new();

1667

if(mc.simple_poll == NULL){

1668

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

2311

simple_poll = avahi_simple_poll_new();

2312

if(simple_poll == NULL){

2313

fprintf_plus(stderr,

2314

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

1669

2315

exitcode = EX_UNAVAILABLE;

1670

2316

goto end;

1671

2317

}

1733

2379

}

1734

2380

}

1735

2381

1736

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

1737

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

1738

if_index = (AvahiIfIndex) if_nametoindex(interface);

1739

if(if_index == 0){

1740

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

1741

exitcode = EX_UNAVAILABLE;

1742

goto end;

1743

}

1744

1745

if(quit_now){

1746

goto end;

1747

}

1748

1749

/* Re-raise priviliges */

1750

errno = 0;

1751

ret = seteuid(0);

1752

if(ret == -1){

1753

perror_plus("seteuid");

1754

}

1755

1756

#ifdef __linux__

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret = klogctl(8, NULL, 5);

1760

bool restore_loglevel = true;

1761

if(ret == -1){

1762

restore_loglevel = false;

1763

perror_plus("klogctl");

1764

}

1765

#endif /* __linux__ */

1766

1767

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1768

if(sd < 0){

1769

perror_plus("socket");

1770

exitcode = EX_OSERR;

1771

#ifdef __linux__

1772

if(restore_loglevel){

1773

ret = klogctl(7, NULL, 0);

1774

if(ret == -1){

1775

perror_plus("klogctl");

1776

}

1777

}

1778

#endif /* __linux__ */

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1784

}

1785

goto end;

1786

}

1787

strcpy(network.ifr_name, interface);

1788

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

1789

if(ret == -1){

1790

perror_plus("ioctl SIOCGIFFLAGS");

1791

#ifdef __linux__

1792

if(restore_loglevel){

1793

ret = klogctl(7, NULL, 0);

1794

if(ret == -1){

1795

perror_plus("klogctl");

1796

}

1797

}

1798

#endif /* __linux__ */

1799

exitcode = EX_OSERR;

1800

/* Lower privileges */

1801

errno = 0;

1802

ret = seteuid(uid);

1803

if(ret == -1){

1804

perror_plus("seteuid");

1805

}

1806

goto end;

1807

}

1808

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

1809

network.ifr_flags |= IFF_UP;

1810

take_down_interface = true;

1811

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

1812

if(ret == -1){

1813

take_down_interface = false;

1814

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1815

exitcode = EX_OSERR;

1816

#ifdef __linux__

1817

if(restore_loglevel){

1818

ret = klogctl(7, NULL, 0);

1819

if(ret == -1){

1820

perror_plus("klogctl");

2382

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

2383

if(mc.interfaces == NULL){

2384

struct dirent **direntries = NULL;

2385

/* Look for any good interfaces */

2386

ret = scandir(sys_class_net, &direntries, good_interface,

2387

alphasort);

2388

if(ret >= 1){

2389

/* Add all found interfaces to interfaces list */

2390

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

2391

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

2392

direntries[i]->d_name);

2393

if(ret_errno != 0){

2394

errno = ret_errno;

2395

perror_plus("argz_add");

2396

free(direntries[i]);

2397

continue;

2398

}

2399

if(debug){

2400

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

2401

direntries[i]->d_name);

2402

}

2403

free(direntries[i]);

2404

}

2405

free(direntries);

2406

} else {

2407

if(ret == 0){

2408

free(direntries);

2409

}

2410

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

2411

exitcode = EXIT_FAILURE;

2412

goto end;

2413

}

2414

}

2415

2416

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

2417

{

2418

char *interface = NULL;

2419

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

2420

interface))){

2421

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

2422

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

2423

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

2424

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

2425

interface);

2426

interface = NULL;

2427

while((interface = argz_next(mc.interfaces,

2428

mc.interfaces_size, interface))){

2429

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

2430

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

2431

interface);

2432

interface = NULL;

1821

2433

}

1822

2434

}

1823

#endif /* __linux__ */

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

}

1833

/* Sleep checking until interface is running.

1834

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

1835

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

1836

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

1837

if(ret == -1){

1838

perror_plus("ioctl SIOCGIFFLAGS");

1839

} else if(network.ifr_flags & IFF_RUNNING){

1840

2435

break;

1841

2436

}

1842

struct timespec sleeptime = { .tv_nsec = 250000000 };

1843

ret = nanosleep(&sleeptime, NULL);

1844

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

1845

perror_plus("nanosleep");

1846

}

1847

}

1848

if(not take_down_interface){

1849

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

1850

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

1851

if(ret == -1){

1852

perror_plus("close");

1853

}

1854

}

1855

#ifdef __linux__

1856

if(restore_loglevel){

1857

/* Restores kernel loglevel to default */

1858

ret = klogctl(7, NULL, 0);

1859

if(ret == -1){

1860

perror_plus("klogctl");

1861

}

1862

}

1863

#endif /* __linux__ */

1864

/* Lower privileges */

1865

errno = 0;

1866

if(take_down_interface){

1867

/* Lower privileges */

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

} else {

1873

/* Lower privileges permanently */

1874

ret = setuid(uid);

1875

if(ret == -1){

1876

perror_plus("setuid");

1877

}

1878

}

2437

bool interface_was_up = interface_is_up(interface);

2438

errno = bring_up_interface(interface, delay);

2439

if(not interface_was_up){

2440

if(errno != 0){

2441

perror_plus("Failed to bring up interface");

2442

} else {

2443

errno = argz_add(&interfaces_to_take_down,

2444

&interfaces_to_take_down_size,

2445

interface);

2446

if(errno != 0){

2447

perror_plus("argz_add");

2448

}

2449

}

2450

}

2451

}

2452

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

2453

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

2454

}

2455

}

2456

2457

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

2458

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

2459

if(debug){

2460

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

2461

mc.interfaces);

2462

}

2463

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

1879

2464

}

1880

2465

1881

2466

if(quit_now){

1882

2467

goto end;

1883

2468

}

1884

2469

1885

ret = init_gnutls_global(pubkey, seckey);

2470

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

1886

2471

if(ret == -1){

1887

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

2472

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

1888

2473

exitcode = EX_UNAVAILABLE;

1889

2474

goto end;

1890

2475

} else {

1895

2480

goto end;

1896

2481

}

1897

2482

1898

if(mkdtemp(tempdir) == NULL){

2483

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

2484

tempdir = mkdtemp(run_tempdir);

2485

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

2486

if(debug){

2487

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

2488

run_tempdir, old_tempdir);

2489

}

2490

tempdir = mkdtemp(old_tempdir);

2491

}

2492

if(tempdir == NULL){

1899

2493

perror_plus("mkdtemp");

1900

2494

goto end;

1901

2495

}

1902

tempdir_created = true;

1903

2496

1904

2497

if(quit_now){

1905

2498

goto end;

1906

2499

}

1907

2500

1908

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

1909

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

2501

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

2502

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

1910

2503

exitcode = EX_UNAVAILABLE;

1911

2504

goto end;

1912

2505

} else {

1921

2514

/* Connect directly, do not use Zeroconf */

1922

2515

/* (Mainly meant for debugging) */

1923

2516

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

2517

1924

2518

if(address == NULL){

1925

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

2519

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

1926

2520

exitcode = EX_USAGE;

1927

2521

goto end;

1928

2522

}

1931

2525

goto end;

1932

2526

}

1933

2527

1934

uint16_t port;

2528

in_port_t port;

1935

2529

errno = 0;

1936

2530

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

1937

2531

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

1938

or tmpmax != (uint16_t)tmpmax){

1939

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

2532

or tmpmax != (in_port_t)tmpmax){

2533

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

1940

2534

exitcode = EX_USAGE;

1941

2535

goto end;

1942

2536

}

1943

2537

1944

2538

if(quit_now){

1945

2539

goto end;

1946

2540

}

1947

2541

1948

port = (uint16_t)tmpmax;

2542

port = (in_port_t)tmpmax;

1949

2543

*address = '\0';

1950

2544

/* Colon in address indicates IPv6 */

1951

2545

int af;

1967

2561

}

1968

2562

1969

2563

while(not quit_now){

1970

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

2564

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

2565

&mc);

1971

2566

if(quit_now or ret == 0){

1972

2567

break;

1973

2568

}

1974

2569

if(debug){

1975

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

1976

(int)retry_interval);

2570

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

2571

(int)retry_interval);

1977

2572

}

1978

sleep((int)retry_interval);

2573

sleep((unsigned int)retry_interval);

1979

2574

}

1980

2575

1981

if (not quit_now){

2576

if(not quit_now){

1982

2577

exitcode = EXIT_SUCCESS;

1983

2578

}

1984

2579

1999

2594

config.publish_domain = 0;

2000

2595

2001

2596

/* Allocate a new server */

2002

mc.server = avahi_server_new(avahi_simple_poll_get

2003

(mc.simple_poll), &config, NULL,

2004

NULL, &error);

2597

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2598

&config, NULL, NULL, &ret_errno);

2005

2599

2006

2600

/* Free the Avahi configuration data */

2007

2601

avahi_server_config_free(&config);

2009

2603

2010

2604

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

2011

2605

if(mc.server == NULL){

2012

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

2013

avahi_strerror(error));

2606

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

2607

avahi_strerror(ret_errno));

2014

2608

exitcode = EX_UNAVAILABLE;

2015

2609

goto end;

2016

2610

}

2022

2616

/* Create the Avahi service browser */

2023

2617

sb = avahi_s_service_browser_new(mc.server, if_index,

2024

2618

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2025

NULL, 0, browse_callback, NULL);

2619

NULL, 0, browse_callback,

2620

(void *)&mc);

2026

2621

if(sb == NULL){

2027

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

2028

avahi_strerror(avahi_server_errno(mc.server)));

2622

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

2623

avahi_strerror(avahi_server_errno(mc.server)));

2029

2624

exitcode = EX_UNAVAILABLE;

2030

2625

goto end;

2031

2626

}

2037

2632

/* Run the main loop */

2038

2633

2039

2634

if(debug){

2040

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

2635

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

2041

2636

}

2042

2043

ret = avahi_loop_with_timeout(mc.simple_poll,

2044

(int)(retry_interval * 1000));

2637

2638

ret = avahi_loop_with_timeout(simple_poll,

2639

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

2045

2640

if(debug){

2046

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

2047

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

2641

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

2642

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

2048

2643

}

2049

2644

2050

2645

end:

2051

2646

2052

2647

if(debug){

2053

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

2648

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

2054

2649

}

2055

2650

2056

2651

/* Cleanup things */

2652

free(mc.interfaces);

2653

2057

2654

if(sb != NULL)

2058

2655

avahi_s_service_browser_free(sb);

2059

2656

2060

2657

if(mc.server != NULL)

2061

2658

avahi_server_free(mc.server);

2062

2659

2063

if(mc.simple_poll != NULL)

2064

avahi_simple_poll_free(mc.simple_poll);

2660

if(simple_poll != NULL)

2661

avahi_simple_poll_free(simple_poll);

2065

2662

2066

2663

if(gnutls_initialized){

2067

2664

gnutls_certificate_free_credentials(mc.cred);

2072

2669

if(gpgme_initialized){

2073

2670

gpgme_release(mc.ctx);

2074

2671

}

2075

2672

2076

2673

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

2077

2674

has seen */

2078

2675

if(mc.current_server != NULL){

2079

2676

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

2080

2677

while(mc.current_server != NULL){

2081

2678

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

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

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2082

2687

free(mc.current_server);

2083

2688

mc.current_server = next;

2084

2689

}

2085

2690

}

2086

2691

2087

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

2088

2089

/* Take down the network interface */

2090

if(take_down_interface){

2091

/* Re-raise priviliges */

2092

errno = 0;

2093

ret = seteuid(0);

2094

if(ret == -1){

2095

perror_plus("seteuid");

2692

/* Re-raise privileges */

2693

{

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

2697

perror_plus("Failed to raise privileges");

2698

} else {

2699

2700

/* Run network hooks */

2701

run_network_hooks("stop", interfaces_hooks != NULL ?

2702

interfaces_hooks : "", delay);

2703

2704

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

2705

{

2706

char *interface = NULL;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("Failed to take down interface");

2714

}

2715

}

2716

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

2717

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

2718

" down\n");

2719

}

2720

}

2096

2721

}

2097

if(geteuid() == 0){

2098

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

2099

if(ret == -1){

2100

perror_plus("ioctl SIOCGIFFLAGS");

2101

} else if(network.ifr_flags & IFF_UP) {

2102

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

2103

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

2104

if(ret == -1){

2105

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2106

}

2107

}

2108

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

2109

if(ret == -1){

2110

perror_plus("close");

2111

}

2112

/* Lower privileges permanently */

2113

errno = 0;

2114

ret = setuid(uid);

2115

if(ret == -1){

2116

perror_plus("setuid");

2117

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2118

2727

}

2119

2728

}

2120

2729

2730

free(interfaces_to_take_down);

2731

free(interfaces_hooks);

2732

2121

2733

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

2122

if(tempdir_created){

2734

if(tempdir != NULL){

2123

2735

struct dirent **direntries = NULL;

2124

struct dirent *direntry = NULL;

2125

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

2126

alphasort);

2127

if (numentries > 0){

2128

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

2129

direntry = direntries[i];

2130

char *fullname = NULL;

2131

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

2132

direntry->d_name);

2133

if(ret < 0){

2134

perror_plus("asprintf");

2135

continue;

2136

}

2137

ret = remove(fullname);

2138

if(ret == -1){

2139

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

2140

strerror(errno));

2141

}

2142

free(fullname);

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2143

2773

}

2144

}

2145

2146

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

2147

free(direntries);

2148

if (numentries == -1){

2149

perror_plus("scandir");

2150

}

2151

ret = rmdir(tempdir);

2152

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

2153

perror_plus("rmdir");

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2154

2775

}

2155

2776

}

2156

2777