/mandos/release : revision 237.7.298

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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

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stdout, ferror(), remove() */

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

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stdout, ferror() */

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

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

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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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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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168

server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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193

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

194

program_invocation_short_name));

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

196

}

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/*

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199

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

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200

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

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201

* "buffer_length" is how much is already used.

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202

*/

203

__attribute__((nonnull, warn_unused_result))

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204

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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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

182

if(buffer == NULL){

207

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

212

*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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217

}

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return buffer_capacity;

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}

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

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

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

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if(new_server == NULL){

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228

perror_plus("malloc");

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return -1;

229

return false;

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230

}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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236

perror_plus("strdup");

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return -1;

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

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#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

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253

}

208

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/* Special case of first server */

209

if (mc.current_server == NULL){

255

if(*current_server == NULL){

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256

new_server->next = new_server;

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257

new_server->prev = new_server;

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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;

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} else {

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new_server->next = mc.current_server;

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

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

222

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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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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279

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/*

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

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*/

240

bool import_key(const char *filename){

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bool import_key(const char * const filename){

241

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int ret;

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int fd;

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gpgme_data_t pgp_data;

250

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

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if(rc != GPG_ERR_NO_ERROR){

253

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;

256

299

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

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302

if(rc != GPG_ERR_NO_ERROR){

260

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;

263

306

}

264

307

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314

}

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273

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if(debug){

274

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

317

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

275

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}

276

319

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/* Init GPGME */

278

321

gpgme_check_version(NULL);

279

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

323

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

324

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

325

gpgme_strsource(rc), gpgme_strerror(rc));

283

326

return false;

284

327

}

285

328

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

329

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

287

330

rc = gpgme_get_engine_info(&engine_info);

288

331

if(rc != GPG_ERR_NO_ERROR){

289

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

290

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));

291

334

return false;

292

335

}

293

336

while(engine_info != NULL){

299

342

engine_info = engine_info->next;

300

343

}

301

344

if(engine_info == NULL){

302

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);

303

347

return false;

304

348

}

305

349

306

350

/* Create new GPGME "context" */

307

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

351

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

308

352

if(rc != GPG_ERR_NO_ERROR){

309

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

310

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));

311

356

return false;

312

357

}

313

358

322

367

* Decrypt OpenPGP data.

323

368

* Returns -1 on error

324

369

*/

370

__attribute__((nonnull, warn_unused_result))

325

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

326

372

size_t crypto_size,

327

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

328

375

gpgme_data_t dh_crypto, dh_plain;

329

376

gpgme_error_t rc;

330

377

ssize_t ret;

332

379

ssize_t plaintext_length = 0;

333

380

334

381

if(debug){

335

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

382

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

336

383

}

337

384

338

385

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

339

386

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

387

0);

341

388

if(rc != GPG_ERR_NO_ERROR){

342

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

343

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));

344

391

return -1;

345

392

}

346

393

347

394

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

348

395

rc = gpgme_data_new(&dh_plain);

349

396

if(rc != GPG_ERR_NO_ERROR){

350

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

351

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));

352

400

gpgme_data_release(dh_crypto);

353

401

return -1;

354

402

}

355

403

356

404

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

357

405

data buffer */

358

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

406

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

359

407

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

362

410

plaintext_length = -1;

363

411

if(debug){

364

412

gpgme_decrypt_result_t result;

365

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

366

414

if(result == NULL){

367

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

415

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

368

416

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

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);

373

421

if(result->file_name != NULL){

374

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

422

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

375

423

}

376

424

gpgme_recipient_t recipient;

377

425

recipient = result->recipients;

378

426

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "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");

385

434

recipient = recipient->next;

386

435

}

387

436

}

390

439

}

391

440

392

441

if(debug){

393

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

442

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

394

443

}

395

444

396

445

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

403

452

*plaintext = NULL;

404

453

while(true){

405

454

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

455

(size_t)plaintext_length,

456

plaintext_capacity);

408

457

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

412

461

}

413

462

414

463

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

476

}

428

477

429

478

if(debug){

430

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

479

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

431

480

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

432

481

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

433

482

}

444

493

return plaintext_length;

445

494

}

446

495

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

450

if(ret == NULL)

451

ret = "(unknown)";

452

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);

453

507

}

454

508

455

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

456

511

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

457

512

const char* string){

458

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

513

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

459

514

}

460

515

516

__attribute__((nonnull, warn_unused_result))

461

517

static int init_gnutls_global(const char *pubkeyfilename,

462

const char *seckeyfilename){

518

const char *seckeyfilename,

519

mandos_context *mc){

463

520

int ret;

521

unsigned int uret;

464

522

465

523

if(debug){

466

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

524

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

467

525

}

468

526

469

527

ret = gnutls_global_init();

470

528

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

529

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

530

safer_gnutls_strerror(ret));

473

531

return -1;

474

532

}

475

533

482

540

}

483

541

484

542

/* OpenPGP credentials */

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

544

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

489

547

gnutls_global_deinit();

490

548

return -1;

491

549

}

492

550

493

551

if(debug){

494

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

495

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

496

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);

497

556

}

498

557

499

558

ret = gnutls_certificate_set_openpgp_key_file

500

(mc.cred, pubkeyfilename, seckeyfilename,

559

(mc->cred, pubkeyfilename, seckeyfilename,

501

560

GNUTLS_OPENPGP_FMT_BASE64);

502

561

if(ret != GNUTLS_E_SUCCESS){

503

fprintf(stderr,

504

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

505

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

506

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

507

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));

508

567

goto globalfail;

509

568

}

510

569

511

570

/* GnuTLS server initialization */

512

ret = gnutls_dh_params_init(&mc.dh_params);

571

ret = gnutls_dh_params_init(&mc->dh_params);

513

572

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

573

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

574

" initialization: %s\n",

575

safer_gnutls_strerror(ret));

516

576

goto globalfail;

517

577

}

518

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);

519

680

if(ret != GNUTLS_E_SUCCESS){

520

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

521

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));

522

683

goto globalfail;

523

684

}

524

685

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

686

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

526

687

527

688

return 0;

528

689

529

690

globalfail:

530

691

531

gnutls_certificate_free_credentials(mc.cred);

692

gnutls_certificate_free_credentials(mc->cred);

532

693

gnutls_global_deinit();

533

gnutls_dh_params_deinit(mc.dh_params);

694

gnutls_dh_params_deinit(mc->dh_params);

534

695

return -1;

535

696

}

536

697

537

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){

538

701

int ret;

539

702

/* GnuTLS session creation */

540

703

do {

544

707

}

545

708

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

546

709

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

710

fprintf_plus(stderr,

711

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

712

safer_gnutls_strerror(ret));

549

713

}

550

714

551

715

{

552

716

const char *err;

553

717

do {

554

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

718

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

555

719

if(quit_now){

556

720

gnutls_deinit(*session);

557

721

return -1;

558

722

}

559

723

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

560

724

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

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));

564

728

gnutls_deinit(*session);

565

729

return -1;

566

730

}

568

732

569

733

do {

570

734

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

571

mc.cred);

735

mc->cred);

572

736

if(quit_now){

573

737

gnutls_deinit(*session);

574

738

return -1;

575

739

}

576

740

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

577

741

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

742

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

743

safer_gnutls_strerror(ret));

580

744

gnutls_deinit(*session);

581

745

return -1;

582

746

}

584

748

/* ignore client certificate if any. */

585

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

586

750

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

588

752

589

753

return 0;

590

754

}

594

758

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

595

759

596

760

/* Called when a Mandos server is found */

597

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,

598

763

AvahiIfIndex if_index,

599

int af){

764

int af, mandos_context *mc){

600

765

int ret, tcp_sd = -1;

601

766

ssize_t sret;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

767

struct sockaddr_storage to;

606

768

char *buffer = NULL;

607

769

char *decrypted_buffer = NULL;

608

770

size_t buffer_length = 0;

627

789

pf = PF_INET;

628

790

break;

629

791

default:

630

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

792

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

631

793

errno = EINVAL;

632

794

return -1;

633

795

}

634

796

635

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);

636

830

if(ret != 0){

637

831

return -1;

638

832

}

639

833

640

834

if(debug){

641

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

642

"\n", ip, port);

835

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

836

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

643

837

}

644

838

645

839

tcp_sd = socket(pf, SOCK_STREAM, 0);

657

851

658

852

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

659

853

if(af == AF_INET6){

660

to.in6.sin6_family = (sa_family_t)af;

661

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);

662

856

} else { /* IPv4 */

663

to.in.sin_family = (sa_family_t)af;

664

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);

665

859

}

666

860

if(ret < 0 ){

667

861

int e = errno;

671

865

}

672

866

if(ret == 0){

673

867

int e = errno;

674

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

868

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

675

869

errno = e;

676

870

goto mandos_end;

677

871

}

678

872

if(af == AF_INET6){

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

686

876

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

877

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

878

" incomplete without a network interface\n");

689

879

errno = EINVAL;

690

880

goto mandos_end;

691

881

}

692

882

/* Set the network interface number as scope */

693

to.in6.sin6_scope_id = (uint32_t)if_index;

883

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

694

884

}

695

885

} else {

696

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

697

-Wconversion and

698

-Wunreachable-code */

886

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

699

887

}

700

888

701

889

if(quit_now){

709

897

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

710

898

perror_plus("if_indextoname");

711

899

} else {

712

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

713

ip, interface, port);

900

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

901

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

714

902

}

715

903

} else {

716

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

717

port);

904

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

905

ip, (uintmax_t)port);

718

906

}

719

907

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

908

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

721

const char *pcret;

722

909

if(af == AF_INET6){

723

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

724

sizeof(addrstr));

910

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

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

725

914

} else {

726

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

727

sizeof(addrstr));

915

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

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

728

919

}

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

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);

735

926

}

736

927

}

737

928

741

932

}

742

933

743

934

if(af == AF_INET6){

744

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

935

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

936

sizeof(struct sockaddr_in6));

745

937

} else {

746

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

938

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

939

sizeof(struct sockaddr_in));

747

940

}

748

941

if(ret < 0){

749

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

942

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

750

943

int e = errno;

751

944

perror_plus("connect");

752

945

errno = e;

764

957

while(true){

765

958

size_t out_size = strlen(out);

766

959

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

767

out_size - written));

960

out_size - written));

768

961

if(ret == -1){

769

962

int e = errno;

770

963

perror_plus("write");

790

983

}

791

984

792

985

if(debug){

793

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

986

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

794

987

}

795

988

796

989

if(quit_now){

798

991

goto mandos_end;

799

992

}

800

993

801

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

802

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);

803

999

804

1000

if(quit_now){

805

1001

errno = EINTR;

816

1012

817

1013

if(ret != GNUTLS_E_SUCCESS){

818

1014

if(debug){

819

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

1015

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

820

1016

gnutls_perror(ret);

821

1017

}

822

1018

errno = EPROTO;

826

1022

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

827

1023

828

1024

if(debug){

829

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

830

ip);

1025

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1026

" %s\n", ip);

831

1027

}

832

1028

833

1029

while(true){

838

1034

}

839

1035

840

1036

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

1037

buffer_capacity);

842

1038

if(buffer_capacity == 0){

843

1039

int e = errno;

844

1040

perror_plus("incbuffer");

871

1067

}

872

1068

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

873

1069

if(ret < 0){

874

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

1070

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

1071

"***\n");

875

1072

gnutls_perror(ret);

876

1073

errno = EPROTO;

877

1074

goto mandos_end;

878

1075

}

879

1076

break;

880

1077

default:

881

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

882

" encrypted session with Mandos server\n");

1078

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

1079

" encrypted session with Mandos server\n");

883

1080

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

1081

errno = EIO;

885

1082

goto mandos_end;

890

1087

}

891

1088

892

1089

if(debug){

893

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

1090

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

894

1091

}

895

1092

896

1093

if(quit_now){

908

1105

909

1106

if(buffer_length > 0){

910

1107

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

1108

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1109

&decrypted_buffer, mc);

914

1110

if(decrypted_buffer_size >= 0){

915

1111

916

1112

written = 0;

926

1122

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

927

1123

int e = errno;

928

1124

if(debug){

929

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

930

strerror(errno));

1125

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

1126

strerror(errno));

931

1127

}

932

1128

errno = e;

933

1129

goto mandos_end;

964

1160

return retval;

965

1161

}

966

1162

1163

__attribute__((nonnull))

967

1164

static void resolve_callback(AvahiSServiceResolver *r,

968

1165

AvahiIfIndex interface,

969

1166

AvahiProtocol proto,

977

1174

AVAHI_GCC_UNUSED AvahiStringList *txt,

978

1175

AVAHI_GCC_UNUSED AvahiLookupResultFlags

979

1176

flags,

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1177

void *mc){

1178

if(r == NULL){

1179

return;

1180

}

982

1181

983

1182

/* Called whenever a service has been resolved successfully or

984

1183

timed out */

985

1184

986

1185

if(quit_now){

1186

avahi_s_service_resolver_free(r);

987

1187

return;

988

1188

}

989

1189

990

1190

switch(event){

991

1191

default:

992

1192

case AVAHI_RESOLVER_FAILURE:

993

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

994

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

995

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)));

996

1198

break;

997

1199

998

1200

case AVAHI_RESOLVER_FOUND:

1000

1202

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1203

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

1002

1204

if(debug){

1003

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

1004

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

1005

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);

1006

1208

}

1007

int ret = start_mandos_communication(ip, port, interface,

1008

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);

1009

1213

if(ret == 0){

1010

avahi_simple_poll_quit(mc.simple_poll);

1214

avahi_simple_poll_quit(simple_poll);

1011

1215

} else {

1012

ret = add_server(ip, port, interface,

1013

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

}

1014

1222

}

1015

1223

}

1016

1224

}

1026

1234

const char *domain,

1027

1235

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1028

1236

flags,

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1237

void *mc){

1238

if(b == NULL){

1239

return;

1240

}

1031

1241

1032

1242

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

1033

1243

is removed from the LAN */

1040

1250

default:

1041

1251

case AVAHI_BROWSER_FAILURE:

1042

1252

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

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);

1046

1257

return;

1047

1258

1048

1259

case AVAHI_BROWSER_NEW:

1051

1262

the callback function is called the Avahi server will free the

1052

1263

resolver for us. */

1053

1264

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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)));

1059

1273

break;

1060

1274

1061

1275

case AVAHI_BROWSER_REMOVE:

1064

1278

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1279

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1280

if(debug){

1067

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

1281

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

1282

" searching...\n");

1068

1283

}

1069

1284

break;

1070

1285

}

1079

1294

signal_received = sig;

1080

1295

int old_errno = errno;

1081

1296

/* set main loop to exit */

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1297

if(simple_poll != NULL){

1298

avahi_simple_poll_quit(simple_poll);

1084

1299

}

1085

1300

errno = old_errno;

1086

1301

}

1087

1302

1303

__attribute__((nonnull, warn_unused_result))

1304

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

1305

int ret;

1306

error_t ret_errno;

1307

1308

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

1309

if(s < 0){

1310

ret_errno = errno;

1311

perror_plus("socket");

1312

errno = ret_errno;

1313

return false;

1314

}

1315

strcpy(ifr->ifr_name, ifname);

1316

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1317

if(ret == -1){

1318

if(debug){

1319

ret_errno = errno;

1320

perror_plus("ioctl SIOCGIFFLAGS");

1321

errno = ret_errno;

1322

}

1323

return false;

1324

}

1325

return true;

1326

}

1327

1328

__attribute__((nonnull, warn_unused_result))

1329

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

1330

1331

/* Reject the loopback device */

1332

if(ifr->ifr_flags & IFF_LOOPBACK){

1333

if(debug){

1334

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

1335

ifname);

1336

}

1337

return false;

1338

}

1339

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

1340

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

1341

if(debug){

1342

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

1343

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

1344

}

1345

return true;

1346

}

1347

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

1348

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

1349

if(debug){

1350

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1351

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

1352

}

1353

return false;

1354

}

1355

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

1356

if(ifr->ifr_flags & IFF_NOARP){

1357

if(debug){

1358

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

1359

ifname);

1360

}

1361

return false;

1362

}

1363

1364

/* Accept this device */

1365

if(debug){

1366

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

1367

}

1368

return true;

1369

}

1370

1088

1371

/*

1089

1372

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

1090

1373

* corresponds to an acceptable network device.

1091

1374

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

1092

1375

*/

1376

__attribute__((nonnull, warn_unused_result))

1093

1377

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

1378

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

1097

1379

return 0;

1098

1380

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1144

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1155

if(debug){

1156

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

1157

if_entry->d_name);

1158

}

1159

return 0;

1160

}

1161

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

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 1;

1168

}

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1171

if(debug){

1172

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

1173

if_entry->d_name);

1174

}

1175

return 0;

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

if_entry->d_name);

1381

1382

struct ifreq ifr;

1383

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

1384

if(debug){

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;

1189

1393

}

1190

1394

return 1;

1191

1395

}

1192

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))

1193

1432

int notdotentries(const struct dirent *direntry){

1194

1433

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

1195

1434

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

1201

1440

return 1;

1202

1441

}

1203

1442

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1443

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

1444

__attribute__((nonnull, warn_unused_result))

1445

int runnable_hook(const struct dirent *direntry){

1446

int ret;

1447

size_t sret;

1448

struct stat st;

1449

1450

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

1451

/* Empty name? */

1452

return 0;

1453

}

1454

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);

1469

if(ret == -1){

1470

if(debug){

1471

perror_plus("Could not stat hook");

1472

}

1473

return 0;

1474

}

1475

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

1476

/* Not a regular file */

1477

if(debug){

1478

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

1479

direntry->d_name);

1480

}

1481

return 0;

1482

}

1483

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

1484

/* Not executable */

1485

if(debug){

1486

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

1487

direntry->d_name);

1488

}

1489

return 0;

1490

}

1491

if(debug){

1492

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

1493

direntry->d_name);

1494

}

1495

return 1;

1496

}

1497

1498

__attribute__((nonnull, warn_unused_result))

1499

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1500

mandos_context *mc){

1205

1501

int ret;

1206

1502

struct timespec now;

1207

1503

struct timespec waited_time;

1208

1504

intmax_t block_time;

1209

1505

1210

1506

while(true){

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

"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");

1215

1511

}

1216

1512

ret = avahi_simple_poll_iterate(s, -1);

1217

1513

} else {

1218

if (debug){

1219

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

1220

" or wait\n");

1514

if(debug){

1515

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

1516

" it, or wait\n");

1221

1517

}

1222

1518

/* the current time */

1223

1519

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1228

1524

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

1229

1525

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

1230

1526

waited_time.tv_sec = (now.tv_sec

1231

- mc.current_server->last_seen.tv_sec);

1527

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

1232

1528

waited_time.tv_nsec = (now.tv_nsec

1233

- mc.current_server->last_seen.tv_nsec);

1529

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

1234

1530

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

1235

1531

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

1236

1532

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

1238

1534

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

1239

1535

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

1240

1536

1241

if (debug){

1242

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

1537

if(debug){

1538

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

1539

block_time);

1243

1540

}

1244

1541

1245

1542

if(block_time <= 0){

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

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);

1250

1547

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1548

avahi_simple_poll_quit(s);

1252

1549

return 0;

1253

1550

}

1254

1551

ret = clock_gettime(CLOCK_MONOTONIC,

1255

&mc.current_server->last_seen);

1552

&mc->current_server->last_seen);

1256

1553

if(ret == -1){

1257

1554

perror_plus("clock_gettime");

1258

1555

return -1;

1259

1556

}

1260

mc.current_server = mc.current_server->next;

1557

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

1261

1558

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

1262

1559

servers, but don't block */

1263

1560

}

1265

1562

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

1266

1563

}

1267

1564

if(ret != 0){

1268

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

1565

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

1269

1566

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

1270

1567

}

1271

1568

}

1272

1569

}

1273

1570

}

1274

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

1275

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 };

1276

2014

AvahiSServiceBrowser *sb = NULL;

1277

int error;

2015

error_t ret_errno;

1278

2016

int ret;

1279

2017

intmax_t tmpmax;

1280

2018

char *tmp;

1281

2019

int exitcode = EXIT_SUCCESS;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1288

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

1289

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;

1290

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1291

2026

const char *seckey = PATHDIR "/" SECKEY;

1292

2027

const char *pubkey = PATHDIR "/" PUBKEY;

2028

char *interfaces_hooks = NULL;

1293

2029

1294

2030

bool gnutls_initialized = false;

1295

2031

bool gpgme_initialized = false;

1357

2093

.group = 2 },

1358

2094

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

1359

2095

.arg = "SECONDS",

1360

.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",

1361

2101

.group = 2 },

1362

2102

/*

1363

2103

* These reproduce what we would get without ARGP_NO_HELP

1382

2122

connect_to = arg;

1383

2123

break;

1384

2124

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

1385

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

}

1386

2130

break;

1387

2131

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

1388

2132

seckey = arg;

1417

2161

argp_error(state, "Bad retry interval");

1418

2162

}

1419

2163

break;

2164

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

2165

hookdir = arg;

2166

break;

1420

2167

/*

1421

2168

* These reproduce what we would get without ARGP_NO_HELP

1422

2169

*/

1428

2175

argp_state_help(state, state->out_stream,

1429

2176

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

2177

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

1431

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

2178

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

1432

2179

exit(argp_err_exit_status);

1433

2180

break;

1434

2181

default:

1461

2208

{

1462

2209

/* Work around Debian bug #633582:

1463

2210

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1474

if(seckey_fd == -1){

1475

perror_plus("open");

1476

} else {

1477

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

1478

if(ret == -1){

1479

perror_plus("fstat");

1480

} else {

1481

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

1482

ret = fchown(seckey_fd, uid, gid);

1483

if(ret == -1){

1484

perror_plus("fchown");

1485

}

1486

}

1487

}

1488

TEMP_FAILURE_RETRY(close(seckey_fd));

1489

}

1490

1491

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1492

if(pubkey_fd == -1){

1493

perror_plus("open");

1494

} else {

1495

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

1496

if(ret == -1){

1497

perror_plus("fstat");

1498

} else {

1499

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

1500

ret = fchown(pubkey_fd, uid, gid);

1501

if(ret == -1){

1502

perror_plus("fchown");

1503

}

1504

}

1505

}

1506

TEMP_FAILURE_RETRY(close(pubkey_fd));

1507

}

1508

1509

/* Lower privileges */

1510

errno = 0;

1511

ret = seteuid(uid);

1512

if(ret == -1){

1513

perror_plus("seteuid");

1514

}

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");

2294

goto end;

2295

}

2296

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

2297

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

2298

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

1515

2301

}

1516

2302

1517

2303

if(not debug){

1518

2304

avahi_set_log_function(empty_log);

1519

2305

}

1520

1521

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

1522

struct dirent **direntries;

1523

ret = scandir(sys_class_net, &direntries, good_interface,

1524

alphasort);

1525

if(ret >= 1){

1526

/* Pick the first good interface */

1527

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

1528

if(debug){

1529

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

1530

}

1531

if(interface == NULL){

1532

perror_plus("malloc");

1533

free(direntries);

1534

exitcode = EXIT_FAILURE;

1535

goto end;

1536

}

1537

free(direntries);

1538

} else {

1539

free(direntries);

1540

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

1541

exitcode = EXIT_FAILURE;

1542

goto end;

1543

}

1544

}

1545

2306

1546

2307

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

1547

2308

from the signal handler */

1548

2309

/* Initialize the pseudo-RNG for Avahi */

1549

2310

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

1550

mc.simple_poll = avahi_simple_poll_new();

1551

if(mc.simple_poll == NULL){

1552

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");

1553

2315

exitcode = EX_UNAVAILABLE;

1554

2316

goto end;

1555

2317

}

1617

2379

}

1618

2380

}

1619

2381

1620

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

1621

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

1622

if_index = (AvahiIfIndex) if_nametoindex(interface);

1623

if(if_index == 0){

1624

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

1625

exitcode = EX_UNAVAILABLE;

1626

goto end;

1627

}

1628

1629

if(quit_now){

1630

goto end;

1631

}

1632

1633

/* Re-raise priviliges */

1634

errno = 0;

1635

ret = seteuid(0);

1636

if(ret == -1){

1637

perror_plus("seteuid");

1638

}

1639

1640

#ifdef __linux__

1641

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1642

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

1643

ret = klogctl(8, NULL, 5);

1644

bool restore_loglevel = true;

1645

if(ret == -1){

1646

restore_loglevel = false;

1647

perror_plus("klogctl");

1648

}

1649

#endif /* __linux__ */

1650

1651

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1652

if(sd < 0){

1653

perror_plus("socket");

1654

exitcode = EX_OSERR;

1655

#ifdef __linux__

1656

if(restore_loglevel){

1657

ret = klogctl(7, NULL, 0);

1658

if(ret == -1){

1659

perror_plus("klogctl");

1660

}

1661

}

1662

#endif /* __linux__ */

1663

/* Lower privileges */

1664

errno = 0;

1665

ret = seteuid(uid);

1666

if(ret == -1){

1667

perror_plus("seteuid");

1668

}

1669

goto end;

1670

}

1671

strcpy(network.ifr_name, interface);

1672

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

1673

if(ret == -1){

1674

perror_plus("ioctl SIOCGIFFLAGS");

1675

#ifdef __linux__

1676

if(restore_loglevel){

1677

ret = klogctl(7, NULL, 0);

1678

if(ret == -1){

1679

perror_plus("klogctl");

1680

}

1681

}

1682

#endif /* __linux__ */

1683

exitcode = EX_OSERR;

1684

/* Lower privileges */

1685

errno = 0;

1686

ret = seteuid(uid);

1687

if(ret == -1){

1688

perror_plus("seteuid");

1689

}

1690

goto end;

1691

}

1692

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

1693

network.ifr_flags |= IFF_UP;

1694

take_down_interface = true;

1695

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

1696

if(ret == -1){

1697

take_down_interface = false;

1698

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1699

exitcode = EX_OSERR;

1700

#ifdef __linux__

1701

if(restore_loglevel){

1702

ret = klogctl(7, NULL, 0);

1703

if(ret == -1){

1704

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;

1705

2433

}

1706

2434

}

1707

#endif /* __linux__ */

1708

/* Lower privileges */

1709

errno = 0;

1710

ret = seteuid(uid);

1711

if(ret == -1){

1712

perror_plus("seteuid");

1713

}

1714

goto end;

1715

}

1716

}

1717

/* Sleep checking until interface is running.

1718

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

1719

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

1720

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

1721

if(ret == -1){

1722

perror_plus("ioctl SIOCGIFFLAGS");

1723

} else if(network.ifr_flags & IFF_RUNNING){

1724

2435

break;

1725

2436

}

1726

struct timespec sleeptime = { .tv_nsec = 250000000 };

1727

ret = nanosleep(&sleeptime, NULL);

1728

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

1729

perror_plus("nanosleep");

1730

}

1731

}

1732

if(not take_down_interface){

1733

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

1734

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

1735

if(ret == -1){

1736

perror_plus("close");

1737

}

1738

}

1739

#ifdef __linux__

1740

if(restore_loglevel){

1741

/* Restores kernel loglevel to default */

1742

ret = klogctl(7, NULL, 0);

1743

if(ret == -1){

1744

perror_plus("klogctl");

1745

}

1746

}

1747

#endif /* __linux__ */

1748

/* Lower privileges */

1749

errno = 0;

1750

if(take_down_interface){

1751

/* Lower privileges */

1752

ret = seteuid(uid);

1753

if(ret == -1){

1754

perror_plus("seteuid");

1755

}

1756

} else {

1757

/* Lower privileges permanently */

1758

ret = setuid(uid);

1759

if(ret == -1){

1760

perror_plus("setuid");

1761

}

1762

}

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);

1763

2464

}

1764

2465

1765

2466

if(quit_now){

1766

2467

goto end;

1767

2468

}

1768

2469

1769

ret = init_gnutls_global(pubkey, seckey);

2470

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

1770

2471

if(ret == -1){

1771

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

2472

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

1772

2473

exitcode = EX_UNAVAILABLE;

1773

2474

goto end;

1774

2475

} else {

1779

2480

goto end;

1780

2481

}

1781

2482

1782

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){

1783

2493

perror_plus("mkdtemp");

1784

2494

goto end;

1785

2495

}

1786

tempdir_created = true;

1787

2496

1788

2497

if(quit_now){

1789

2498

goto end;

1790

2499

}

1791

2500

1792

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

1793

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

2501

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

2502

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

1794

2503

exitcode = EX_UNAVAILABLE;

1795

2504

goto end;

1796

2505

} else {

1805

2514

/* Connect directly, do not use Zeroconf */

1806

2515

/* (Mainly meant for debugging) */

1807

2516

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

2517

1808

2518

if(address == NULL){

1809

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

2519

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

1810

2520

exitcode = EX_USAGE;

1811

2521

goto end;

1812

2522

}

1815

2525

goto end;

1816

2526

}

1817

2527

1818

uint16_t port;

2528

in_port_t port;

1819

2529

errno = 0;

1820

2530

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

1821

2531

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

1822

or tmpmax != (uint16_t)tmpmax){

1823

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

2532

or tmpmax != (in_port_t)tmpmax){

2533

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

1824

2534

exitcode = EX_USAGE;

1825

2535

goto end;

1826

2536

}

1827

2537

1828

2538

if(quit_now){

1829

2539

goto end;

1830

2540

}

1831

2541

1832

port = (uint16_t)tmpmax;

2542

port = (in_port_t)tmpmax;

1833

2543

*address = '\0';

1834

2544

/* Colon in address indicates IPv6 */

1835

2545

int af;

1851

2561

}

1852

2562

1853

2563

while(not quit_now){

1854

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

2564

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

2565

&mc);

1855

2566

if(quit_now or ret == 0){

1856

2567

break;

1857

2568

}

1858

2569

if(debug){

1859

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

1860

(int)retry_interval);

2570

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

2571

(int)retry_interval);

1861

2572

}

1862

sleep((int)retry_interval);

1863

};

1864

1865

if (not quit_now){

2573

sleep((unsigned int)retry_interval);

2574

}

2575

2576

if(not quit_now){

1866

2577

exitcode = EXIT_SUCCESS;

1867

2578

}

1868

2579

1869

2580

goto end;

1870

2581

}

1871

2582

1883

2594

config.publish_domain = 0;

1884

2595

1885

2596

/* Allocate a new server */

1886

mc.server = avahi_server_new(avahi_simple_poll_get

1887

(mc.simple_poll), &config, NULL,

1888

NULL, &error);

2597

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2598

&config, NULL, NULL, &ret_errno);

1889

2599

1890

2600

/* Free the Avahi configuration data */

1891

2601

avahi_server_config_free(&config);

1893

2603

1894

2604

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

1895

2605

if(mc.server == NULL){

1896

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

1897

avahi_strerror(error));

2606

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

2607

avahi_strerror(ret_errno));

1898

2608

exitcode = EX_UNAVAILABLE;

1899

2609

goto end;

1900

2610

}

1906

2616

/* Create the Avahi service browser */

1907

2617

sb = avahi_s_service_browser_new(mc.server, if_index,

1908

2618

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1909

NULL, 0, browse_callback, NULL);

2619

NULL, 0, browse_callback,

2620

(void *)&mc);

1910

2621

if(sb == NULL){

1911

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

1912

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)));

1913

2624

exitcode = EX_UNAVAILABLE;

1914

2625

goto end;

1915

2626

}

1921

2632

/* Run the main loop */

1922

2633

1923

2634

if(debug){

1924

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

2635

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

1925

2636

}

1926

1927

ret = avahi_loop_with_timeout(mc.simple_poll,

1928

(int)(retry_interval * 1000));

2637

2638

ret = avahi_loop_with_timeout(simple_poll,

2639

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

1929

2640

if(debug){

1930

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

1931

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

2641

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

2642

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

1932

2643

}

1933

2644

1934

2645

end:

1935

2646

1936

2647

if(debug){

1937

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

2648

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

1938

2649

}

1939

2650

1940

2651

/* Cleanup things */

2652

free(mc.interfaces);

2653

1941

2654

if(sb != NULL)

1942

2655

avahi_s_service_browser_free(sb);

1943

2656

1944

2657

if(mc.server != NULL)

1945

2658

avahi_server_free(mc.server);

1946

2659

1947

if(mc.simple_poll != NULL)

1948

avahi_simple_poll_free(mc.simple_poll);

2660

if(simple_poll != NULL)

2661

avahi_simple_poll_free(simple_poll);

1949

2662

1950

2663

if(gnutls_initialized){

1951

2664

gnutls_certificate_free_credentials(mc.cred);

1956

2669

if(gpgme_initialized){

1957

2670

gpgme_release(mc.ctx);

1958

2671

}

1959

2672

1960

2673

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

1961

2674

has seen */

1962

2675

if(mc.current_server != NULL){

1963

2676

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

1964

2677

while(mc.current_server != NULL){

1965

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

1966

2687

free(mc.current_server);

1967

2688

mc.current_server = next;

1968

2689

}

1969

2690

}

1970

2691

1971

/* Take down the network interface */

1972

if(take_down_interface){

1973

/* Re-raise priviliges */

1974

errno = 0;

1975

ret = seteuid(0);

1976

if(ret == -1){

1977

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

}

1978

2721

}

1979

if(geteuid() == 0){

1980

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

1981

if(ret == -1){

1982

perror_plus("ioctl SIOCGIFFLAGS");

1983

} else if(network.ifr_flags & IFF_UP) {

1984

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

1985

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

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1988

}

1989

}

1990

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

1991

if(ret == -1){

1992

perror_plus("close");

1993

}

1994

/* Lower privileges permanently */

1995

errno = 0;

1996

ret = setuid(uid);

1997

if(ret == -1){

1998

perror_plus("setuid");

1999

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2000

2727

}

2001

2728

}

2002

2729

2730

free(interfaces_to_take_down);

2731

free(interfaces_hooks);

2732

2003

2733

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

2004

if(tempdir_created){

2734

if(tempdir != NULL){

2005

2735

struct dirent **direntries = NULL;

2006

struct dirent *direntry = NULL;

2007

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

2008

if (ret > 0){

2009

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

2010

direntry = direntries[i];

2011

char *fullname = NULL;

2012

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

2013

direntry->d_name);

2014

if(ret < 0){

2015

perror_plus("asprintf");

2016

continue;

2017

}

2018

ret = remove(fullname);

2019

if(ret == -1){

2020

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

2021

strerror(errno));

2022

}

2023

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

}

2024

2773

}

2025

}

2026

2027

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

2028

specify */

2029

free(direntries);

2030

if (ret == -1){

2031

perror_plus("scandir");

2032

}

2033

ret = rmdir(tempdir);

2034

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

2035

perror_plus("rmdir");

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2036

2775

}

2037

2776

}

2038

2777