/mandos/release : revision 237.2.214

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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@recompile.se>.

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

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*/

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

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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, intptr_t */

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect(),

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getnameinfo() */

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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program_invocation_short_name */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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*/

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

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

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setgid(), pause(), _exit() */

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

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setgid(), pause() */

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

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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@recompile.se>";

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.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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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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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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139

gnutls_dh_params_t dh_params;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP" };

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174

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sig_atomic_t quit_now = 0;

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150

int signal_received = 0;

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151

177

/* Function to use when printing errors */

178

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;

183

perror(print_text);

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}

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186

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

187

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

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va_list ap;

189

va_start (ap, format);

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191

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

192

program_invocation_short_name));

193

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

194

}

195

196

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/*

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153

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

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154

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

199

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* "buffer_length" is how much is already used.

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156

*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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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;

209

*buffer = NULL;

160

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

161

if(buffer == NULL){

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162

return 0;

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163

}

212

*buffer = new_buf;

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164

buffer_capacity += BUFFER_SIZE;

214

165

}

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166

return buffer_capacity;

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167

}

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

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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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perror_plus("malloc");

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return false;

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}

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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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if(new_server->ip == NULL){

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perror_plus("strdup");

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return false;

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}

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

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if(ret == -1){

237

perror_plus("clock_gettime");

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return false;

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}

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/* Special case of first server */

241

if(*current_server == NULL){

242

new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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

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} else {

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new_server->next = *current_server;

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

249

new_server->prev->next = new_server;

250

(*current_server)->prev = new_server;

251

}

252

return true;

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}

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/*

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170

* Initialize GPGME.

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171

*/

258

static bool init_gpgme(const char *seckey, const char *pubkey,

259

const char *tempdir, mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

265

180

*/

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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

272

187

if(fd == -1){

273

perror_plus("open");

188

perror("open");

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189

return false;

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190

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

279

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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197

}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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if(ret == -1){

293

perror_plus("close");

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perror("close");

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}

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210

gpgme_data_release(pgp_data);

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return true;

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212

}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

305

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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221

if(rc != GPG_ERR_NO_ERROR){

307

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

310

225

}

311

226

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

227

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

313

228

rc = gpgme_get_engine_info(&engine_info);

314

229

if(rc != GPG_ERR_NO_ERROR){

315

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

316

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

317

232

return false;

318

233

}

319

234

while(engine_info != NULL){

325

240

engine_info = engine_info->next;

326

241

}

327

242

if(engine_info == NULL){

328

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

329

tempdir);

243

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

330

244

return false;

331

245

}

332

246

333

247

/* Create new GPGME "context" */

334

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

248

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

335

249

if(rc != GPG_ERR_NO_ERROR){

336

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

337

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

338

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

339

252

return false;

340

253

}

341

254

352

265

*/

353

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

267

size_t crypto_size,

355

char **plaintext,

356

mandos_context *mc){

268

char **plaintext){

357

269

gpgme_data_t dh_crypto, dh_plain;

358

270

gpgme_error_t rc;

359

271

ssize_t ret;

361

273

ssize_t plaintext_length = 0;

362

274

363

275

if(debug){

364

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

276

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

365

277

}

366

278

367

279

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

368

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

369

281

0);

370

282

if(rc != GPG_ERR_NO_ERROR){

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

373

285

return -1;

374

286

}

375

287

376

288

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

377

289

rc = gpgme_data_new(&dh_plain);

378

290

if(rc != GPG_ERR_NO_ERROR){

379

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

380

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

381

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

382

293

gpgme_data_release(dh_crypto);

383

294

return -1;

384

295

}

385

296

386

297

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

387

298

data buffer */

388

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

299

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

389

300

if(rc != GPG_ERR_NO_ERROR){

390

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

391

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

392

303

plaintext_length = -1;

393

304

if(debug){

394

305

gpgme_decrypt_result_t result;

395

result = gpgme_op_decrypt_result(mc->ctx);

306

result = gpgme_op_decrypt_result(mc.ctx);

396

307

if(result == NULL){

397

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

308

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

398

309

} else {

399

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

400

result->unsupported_algorithm);

401

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

402

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

403

314

if(result->file_name != NULL){

404

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

315

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

405

316

}

406

317

gpgme_recipient_t recipient;

407

318

recipient = result->recipients;

408

319

while(recipient != NULL){

409

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

410

gpgme_pubkey_algo_name

411

(recipient->pubkey_algo));

412

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

413

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

414

recipient->status == GPG_ERR_NO_SECKEY

415

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

416

326

recipient = recipient->next;

417

327

}

418

328

}

421

331

}

422

332

423

333

if(debug){

424

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

334

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

425

335

}

426

336

427

337

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

428

338

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

429

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

430

340

plaintext_length = -1;

431

341

goto decrypt_end;

432

342

}

434

344

*plaintext = NULL;

435

345

while(true){

436

346

plaintext_capacity = incbuffer(plaintext,

437

(size_t)plaintext_length,

438

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

439

349

if(plaintext_capacity == 0){

440

perror_plus("incbuffer");

441

plaintext_length = -1;

442

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

443

353

}

444

354

445

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

360

break;

451

361

}

452

362

if(ret < 0){

453

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

454

364

plaintext_length = -1;

455

365

goto decrypt_end;

456

366

}

458

368

}

459

369

460

370

if(debug){

461

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

371

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

462

372

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

463

373

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

464

374

}

476

386

}

477

387

478

388

static const char * safer_gnutls_strerror(int value){

479

const char *ret = gnutls_strerror(value);

389

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

390

-Wunreachable-code */

480

391

if(ret == NULL)

481

392

ret = "(unknown)";

482

393

return ret;

485

396

/* GnuTLS log function callback */

486

397

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

487

398

const char* string){

488

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

399

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

489

400

}

490

401

491

402

static int init_gnutls_global(const char *pubkeyfilename,

492

const char *seckeyfilename,

493

mandos_context *mc){

403

const char *seckeyfilename){

494

404

int ret;

495

405

496

406

if(debug){

497

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

407

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

498

408

}

499

409

500

410

ret = gnutls_global_init();

501

411

if(ret != GNUTLS_E_SUCCESS){

502

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

503

safer_gnutls_strerror(ret));

412

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

413

safer_gnutls_strerror(ret));

504

414

return -1;

505

415

}

506

416

513

423

}

514

424

515

425

/* OpenPGP credentials */

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

517

427

if(ret != GNUTLS_E_SUCCESS){

518

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

519

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

520

433

gnutls_global_deinit();

521

434

return -1;

522

435

}

523

436

524

437

if(debug){

525

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

526

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

527

pubkeyfilename,

528

seckeyfilename);

438

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

439

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

440

seckeyfilename);

529

441

}

530

442

531

443

ret = gnutls_certificate_set_openpgp_key_file

532

(mc->cred, pubkeyfilename, seckeyfilename,

444

(mc.cred, pubkeyfilename, seckeyfilename,

533

445

GNUTLS_OPENPGP_FMT_BASE64);

534

446

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr,

536

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

537

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

538

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

539

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

540

452

goto globalfail;

541

453

}

542

454

543

455

/* GnuTLS server initialization */

544

ret = gnutls_dh_params_init(&mc->dh_params);

456

ret = gnutls_dh_params_init(&mc.dh_params);

545

457

if(ret != GNUTLS_E_SUCCESS){

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

" initialization: %s\n",

548

safer_gnutls_strerror(ret));

458

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

459

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

549

460

goto globalfail;

550

461

}

551

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

462

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

552

463

if(ret != GNUTLS_E_SUCCESS){

553

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

554

safer_gnutls_strerror(ret));

464

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

465

safer_gnutls_strerror(ret));

555

466

goto globalfail;

556

467

}

557

468

558

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

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

559

470

560

471

return 0;

561

472

562

473

globalfail:

563

474

564

gnutls_certificate_free_credentials(mc->cred);

475

gnutls_certificate_free_credentials(mc.cred);

565

476

gnutls_global_deinit();

566

gnutls_dh_params_deinit(mc->dh_params);

477

gnutls_dh_params_deinit(mc.dh_params);

567

478

return -1;

568

479

}

569

480

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

481

static int init_gnutls_session(gnutls_session_t *session){

572

482

int ret;

573

483

/* GnuTLS session creation */

574

484

do {

578

488

}

579

489

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

580

490

if(ret != GNUTLS_E_SUCCESS){

581

fprintf_plus(stderr,

582

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

583

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

584

493

}

585

494

586

495

{

587

496

const char *err;

588

497

do {

589

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

498

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

590

499

if(quit_now){

591

500

gnutls_deinit(*session);

592

501

return -1;

593

502

}

594

503

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

595

504

if(ret != GNUTLS_E_SUCCESS){

596

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

597

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

598

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

599

508

gnutls_deinit(*session);

600

509

return -1;

601

510

}

603

512

604

513

do {

605

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

606

mc->cred);

515

mc.cred);

607

516

if(quit_now){

608

517

gnutls_deinit(*session);

609

518

return -1;

610

519

}

611

520

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

612

521

if(ret != GNUTLS_E_SUCCESS){

613

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

614

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

615

524

gnutls_deinit(*session);

616

525

return -1;

617

526

}

619

528

/* ignore client certificate if any. */

620

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

621

530

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

623

532

624

533

return 0;

625

534

}

629

538

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

630

539

631

540

/* Called when a Mandos server is found */

632

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

541

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

633

542

AvahiIfIndex if_index,

634

int af, mandos_context *mc){

543

int af){

635

544

int ret, tcp_sd = -1;

636

545

ssize_t sret;

637

546

union {

662

571

pf = PF_INET;

663

572

break;

664

573

default:

665

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

574

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

666

575

errno = EINVAL;

667

576

return -1;

668

577

}

669

578

670

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

671

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

672

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

673

bool match = false;

674

{

675

char *interface = NULL;

676

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

677

interface))){

678

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

679

match = true;

680

break;

681

}

682

}

683

}

684

if(not match){

685

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

686

connect to the server */

687

if(debug){

688

char interface[IF_NAMESIZE];

689

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

690

perror_plus("if_indextoname");

691

} else {

692

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

693

" \"%s\"\n",

694

if_indextoname((unsigned int)if_index,

695

interface));

696

}

697

}

698

return -1;

699

}

700

}

701

702

ret = init_gnutls_session(&session, mc);

579

ret = init_gnutls_session(&session);

703

580

if(ret != 0){

704

581

return -1;

705

582

}

706

583

707

584

if(debug){

708

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

709

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

585

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

586

"\n", ip, port);

710

587

}

711

588

712

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

713

590

if(tcp_sd < 0){

714

591

int e = errno;

715

perror_plus("socket");

592

perror("socket");

716

593

errno = e;

717

594

goto mandos_end;

718

595

}

732

609

}

733

610

if(ret < 0 ){

734

611

int e = errno;

735

perror_plus("inet_pton");

612

perror("inet_pton");

736

613

errno = e;

737

614

goto mandos_end;

738

615

}

739

616

if(ret == 0){

740

617

int e = errno;

741

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

618

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

742

619

errno = e;

743

620

goto mandos_end;

744

621

}

745

622

if(af == AF_INET6){

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

751

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

628

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

629

-Wunreachable-code*/

756

630

if(if_index == AVAHI_IF_UNSPEC){

757

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

758

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

759

633

errno = EINVAL;

760

634

goto mandos_end;

761

635

}

763

637

to.in6.sin6_scope_id = (uint32_t)if_index;

764

638

}

765

639

} else {

766

to.in.sin_port = htons(port);

640

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

641

-Wconversion and

642

-Wunreachable-code */

767

643

}

768

644

769

645

if(quit_now){

775

651

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

776

652

char interface[IF_NAMESIZE];

777

653

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

778

perror_plus("if_indextoname");

654

perror("if_indextoname");

779

655

} else {

780

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

781

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

656

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

657

ip, interface, port);

782

658

}

783

659

} else {

784

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

785

ip, (uintmax_t)port);

660

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

661

port);

786

662

}

787

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

788

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

665

const char *pcret;

789

666

if(af == AF_INET6){

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

667

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

668

sizeof(addrstr));

793

669

} else {

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

670

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

671

sizeof(addrstr));

797

672

}

798

if(ret == EAI_SYSTEM){

799

perror_plus("getnameinfo");

800

} else if(ret != 0) {

801

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

802

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

803

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

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

804

679

}

805

680

}

806

681

817

692

if(ret < 0){

818

693

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

819

694

int e = errno;

820

perror_plus("connect");

695

perror("connect");

821

696

errno = e;

822

697

}

823

698

goto mandos_end;

833

708

while(true){

834

709

size_t out_size = strlen(out);

835

710

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

836

out_size - written));

711

out_size - written));

837

712

if(ret == -1){

838

713

int e = errno;

839

perror_plus("write");

714

perror("write");

840

715

errno = e;

841

716

goto mandos_end;

842

717

}

859

734

}

860

735

861

736

if(debug){

862

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

737

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

863

738

}

864

739

865

740

if(quit_now){

867

742

goto mandos_end;

868

743

}

869

744

870

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

871

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

872

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

873

gnutls_transport_set_ptr(session,

874

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

746

876

747

if(quit_now){

877

748

errno = EINTR;

888

759

889

760

if(ret != GNUTLS_E_SUCCESS){

890

761

if(debug){

891

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

762

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

892

763

gnutls_perror(ret);

893

764

}

894

765

errno = EPROTO;

898

769

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

899

770

900

771

if(debug){

901

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

902

" %s\n", ip);

772

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

773

ip);

903

774

}

904

775

905

776

while(true){

910

781

}

911

782

912

783

buffer_capacity = incbuffer(&buffer, buffer_length,

913

buffer_capacity);

784

buffer_capacity);

914

785

if(buffer_capacity == 0){

915

786

int e = errno;

916

perror_plus("incbuffer");

787

perror("incbuffer");

917

788

errno = e;

918

789

goto mandos_end;

919

790

}

943

814

}

944

815

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

945

816

if(ret < 0){

946

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

947

"***\n");

817

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

948

818

gnutls_perror(ret);

949

819

errno = EPROTO;

950

820

goto mandos_end;

951

821

}

952

822

break;

953

823

default:

954

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

955

" encrypted session with Mandos server\n");

824

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

825

" encrypted session with Mandos server\n");

956

826

gnutls_bye(session, GNUTLS_SHUT_RDWR);

957

827

errno = EIO;

958

828

goto mandos_end;

963

833

}

964

834

965

835

if(debug){

966

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

836

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

967

837

}

968

838

969

839

if(quit_now){

981

851

982

852

if(buffer_length > 0){

983

853

ssize_t decrypted_buffer_size;

984

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

985

&decrypted_buffer, mc);

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

856

&decrypted_buffer);

986

857

if(decrypted_buffer_size >= 0){

987

858

988

859

written = 0;

998

869

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

999

870

int e = errno;

1000

871

if(debug){

1001

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

1002

strerror(errno));

872

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

873

strerror(errno));

1003

874

}

1004

875

errno = e;

1005

876

goto mandos_end;

1024

895

if(e == 0){

1025

896

e = errno;

1026

897

}

1027

perror_plus("close");

898

perror("close");

1028

899

}

1029

900

gnutls_deinit(session);

1030

errno = e;

1031

901

if(quit_now){

1032

errno = EINTR;

902

e = EINTR;

1033

903

retval = -1;

1034

904

}

905

errno = e;

1035

906

}

1036

907

return retval;

1037

908

}

1049

920

AVAHI_GCC_UNUSED AvahiStringList *txt,

1050

921

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1051

922

flags,

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

923

AVAHI_GCC_UNUSED void* userdata){

924

assert(r);

1056

925

1057

926

/* Called whenever a service has been resolved successfully or

1058

927

timed out */

1064

933

switch(event){

1065

934

default:

1066

935

case AVAHI_RESOLVER_FAILURE:

1067

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

1068

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

1069

domain,

1070

avahi_strerror(avahi_server_errno

1071

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

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1072

939

break;

1073

940

1074

941

case AVAHI_RESOLVER_FOUND:

1076

943

char ip[AVAHI_ADDRESS_STR_MAX];

1077

944

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

1078

945

if(debug){

1079

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

1080

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

1081

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

946

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

947

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

948

ip, (intmax_t)interface, port);

1082

949

}

1083

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

1084

interface,

1085

avahi_proto_to_af(proto),

1086

mc);

950

int ret = start_mandos_communication(ip, port, interface,

951

avahi_proto_to_af(proto));

1087

952

if(ret == 0){

1088

avahi_simple_poll_quit(simple_poll);

1089

} else {

1090

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

1091

avahi_proto_to_af(proto),

1092

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

1093

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

1094

" list\n", name);

1095

}

953

avahi_simple_poll_quit(mc.simple_poll);

1096

954

}

1097

955

}

1098

956

}

1108

966

const char *domain,

1109

967

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1110

968

flags,

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

969

AVAHI_GCC_UNUSED void* userdata){

970

assert(b);

1115

971

1116

972

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

1117

973

is removed from the LAN */

1124

980

default:

1125

981

case AVAHI_BROWSER_FAILURE:

1126

982

1127

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

1128

avahi_strerror(avahi_server_errno

1129

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

1130

avahi_simple_poll_quit(simple_poll);

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

1131

986

return;

1132

987

1133

988

case AVAHI_BROWSER_NEW:

1136

991

the callback function is called the Avahi server will free the

1137

992

resolver for us. */

1138

993

1139

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

1140

interface, protocol, name, type,

1141

domain, protocol, 0,

1142

resolve_callback, mc) == NULL)

1143

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

1144

" %s\n", name,

1145

avahi_strerror(avahi_server_errno

1146

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

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

997

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

998

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

1147

999

break;

1148

1000

1149

1001

case AVAHI_BROWSER_REMOVE:

1152

1004

case AVAHI_BROWSER_ALL_FOR_NOW:

1153

1005

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1154

1006

if(debug){

1155

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

1156

" searching...\n");

1007

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

1157

1008

}

1158

1009

break;

1159

1010

}

1160

1011

}

1161

1012

1162

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

1013

/* stop main loop after sigterm has been called */

1163

1014

static void handle_sigterm(int sig){

1164

1015

if(quit_now){

1165

1016

return;

1167

1018

quit_now = 1;

1168

1019

signal_received = sig;

1169

1020

int old_errno = errno;

1170

/* set main loop to exit */

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1173

1023

}

1174

1024

errno = old_errno;

1175

1025

}

1176

1026

1177

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

1178

int ret;

1179

error_t ret_errno;

1180

1181

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

1182

if(s < 0){

1183

ret_errno = errno;

1184

perror_plus("socket");

1185

errno = ret_errno;

1186

return false;

1187

}

1188

strcpy(ifr->ifr_name, ifname);

1189

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1190

if(ret == -1){

1191

if(debug){

1192

ret_errno = errno;

1193

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1195

}

1196

return false;

1197

}

1198

return true;

1199

}

1200

1201

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

1202

1203

/* Reject the loopback device */

1204

if(ifr->ifr_flags & IFF_LOOPBACK){

1205

if(debug){

1206

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

1207

ifname);

1208

}

1209

return false;

1210

}

1211

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

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return true;

1218

}

1219

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

1220

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

1221

if(debug){

1222

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1223

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

1224

}

1225

return false;

1226

}

1227

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

1228

if(ifr->ifr_flags & IFF_NOARP){

1229

if(debug){

1230

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

1231

ifname);

1232

}

1233

return false;

1234

}

1235

1236

/* Accept this device */

1237

if(debug){

1238

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

1239

}

1240

return true;

1241

}

1242

1243

1027

/*

1244

1028

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

1245

1029

* corresponds to an acceptable network device.

1246

1030

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

1247

1031

*/

1248

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1249

1041

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

1250

1042

return 0;

1251

1043

}

1252

1253

struct ifreq ifr;

1254

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

1255

if(debug){

1256

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

1257

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

1258

}

1259

return 0;

1260

}

1261

1262

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

1263

return 0;

1264

}

1265

return 1;

1266

}

1267

1268

/*

1269

* This function determines if a network interface is up.

1270

*/

1271

bool interface_is_up(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1282

}

1283

1284

/*

1285

* This function determines if a network interface is running

1286

*/

1287

bool interface_is_running(const char *interface){

1288

struct ifreq ifr;

1289

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

1290

if(debug){

1291

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

1292

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

1293

}

1294

return false;

1295

}

1296

1297

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

1298

}

1299

1300

int notdotentries(const struct dirent *direntry){

1301

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

1302

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

1303

and (direntry->d_name[1] == '\0'

1304

or (direntry->d_name[1] == '.'

1305

and direntry->d_name[2] == '\0'))){

1306

return 0;

1307

}

1308

return 1;

1309

}

1310

1311

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

1312

int runnable_hook(const struct dirent *direntry){

1313

int ret;

1314

size_t sret;

1315

struct stat st;

1316

1317

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

1318

/* Empty name? */

1319

return 0;

1320

}

1321

1322

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

1323

"abcdefghijklmnopqrstuvwxyz"

1324

"0123456789"

1325

"_-");

1326

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

1327

/* Contains non-allowed characters */

1328

if(debug){

1329

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

1330

direntry->d_name);

1331

}

1332

return 0;

1333

}

1334

1335

char *fullname = NULL;

1336

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

1337

if(ret < 0){

1338

perror_plus("asprintf");

1339

return 0;

1340

}

1341

1342

ret = stat(fullname, &st);

1343

if(ret == -1){

1344

if(debug){

1345

perror_plus("Could not stat hook");

1346

}

1347

return 0;

1348

}

1349

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

1350

/* Not a regular file */

1351

if(debug){

1352

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

1353

direntry->d_name);

1354

}

1355

return 0;

1356

}

1357

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

1358

/* Not executable */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

return 0;

1364

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1365

1115

if(debug){

1366

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

1367

direntry->d_name);

1116

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

1117

if_entry->d_name);

1368

1118

}

1369

1119

return 1;

1370

1120

}

1371

1121

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

mandos_context *mc){

1374

int ret;

1375

struct timespec now;

1376

struct timespec waited_time;

1377

intmax_t block_time;

1378

1379

while(true){

1380

if(mc->current_server == NULL){

1381

if (debug){

1382

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

1383

" No timeout!\n");

1384

}

1385

ret = avahi_simple_poll_iterate(s, -1);

1386

} else {

1387

if (debug){

1388

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

1389

" it, or wait\n");

1390

}

1391

/* the current time */

1392

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1393

if(ret == -1){

1394

perror_plus("clock_gettime");

1395

return -1;

1396

}

1397

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

1398

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

1399

waited_time.tv_sec = (now.tv_sec

1400

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

1401

waited_time.tv_nsec = (now.tv_nsec

1402

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

1403

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

1404

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

1405

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

1406

block_time = ((retry_interval

1407

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

1408

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

1409

1410

if (debug){

1411

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

1412

block_time);

1413

}

1414

1415

if(block_time <= 0){

1416

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

1417

mc->current_server->port,

1418

mc->current_server->if_index,

1419

mc->current_server->af, mc);

1420

if(ret == 0){

1421

avahi_simple_poll_quit(s);

1422

return 0;

1423

}

1424

ret = clock_gettime(CLOCK_MONOTONIC,

1425

&mc->current_server->last_seen);

1426

if(ret == -1){

1427

perror_plus("clock_gettime");

1428

return -1;

1429

}

1430

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

1431

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

1432

servers, but don't block */

1433

}

1434

1435

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

1436

}

1437

if(ret != 0){

1438

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

1439

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

1440

}

1441

}

1442

}

1443

}

1444

1445

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

1446

error_t raise_privileges(void){

1447

error_t old_errno = errno;

1448

error_t ret_errno = 0;

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t raise_privileges_permanently(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = raise_privileges();

1461

if(ret_errno != 0){

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

error_t lower_privileges(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = 0;

1477

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

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

/* Lower privileges permanently */

1486

error_t lower_privileges_permanently(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("setuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

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

1498

const float delay){

1499

struct dirent **direntries;

1500

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

1501

alphasort);

1502

if(numhooks == -1){

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1510

}

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

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

1515

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

1516

direntry = direntries[i];

1517

char *fullname = NULL;

1518

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

1519

if(ret < 0){

1520

perror_plus("asprintf");

1521

continue;

1522

}

1523

if(debug){

1524

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

1525

direntry->d_name);

1526

}

1527

pid_t hook_pid = fork();

1528

if(hook_pid == 0){

1529

/* Child */

1530

/* Raise privileges */

1531

raise_privileges_permanently();

1532

/* Set group */

1533

errno = 0;

1534

ret = setgid(0);

1535

if(ret == -1){

1536

perror_plus("setgid");

1537

}

1538

/* Reset supplementary groups */

1539

errno = 0;

1540

ret = setgroups(0, NULL);

1541

if(ret == -1){

1542

perror_plus("setgroups");

1543

}

1544

dup2(devnull, STDIN_FILENO);

1545

close(devnull);

1546

dup2(STDERR_FILENO, STDOUT_FILENO);

1547

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

1548

if(ret == -1){

1549

perror_plus("setenv");

1550

_exit(EX_OSERR);

1551

}

1552

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

1553

if(ret == -1){

1554

perror_plus("setenv");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

perror_plus("setenv");

1560

_exit(EX_OSERR);

1561

}

1562

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

1563

if(ret == -1){

1564

perror_plus("setenv");

1565

_exit(EX_OSERR);

1566

}

1567

char *delaystring;

1568

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

1569

if(ret == -1){

1570

perror_plus("asprintf");

1571

_exit(EX_OSERR);

1572

}

1573

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

1574

if(ret == -1){

1575

free(delaystring);

1576

perror_plus("setenv");

1577

_exit(EX_OSERR);

1578

}

1579

free(delaystring);

1580

if(connect_to != NULL){

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1591

} else {

1592

int status;

1593

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

1594

perror_plus("waitpid");

1595

free(fullname);

1596

continue;

1597

}

1598

if(WIFEXITED(status)){

1599

if(WEXITSTATUS(status) != 0){

1600

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

1601

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

1602

WEXITSTATUS(status));

1603

free(fullname);

1604

continue;

1605

}

1606

} else if(WIFSIGNALED(status)){

1607

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

1608

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

1609

WTERMSIG(status));

1610

free(fullname);

1611

continue;

1612

} else {

1613

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

1614

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

1615

free(fullname);

1616

continue;

1617

}

1618

}

1619

free(fullname);

1620

if(debug){

1621

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

1622

direntry->d_name);

1623

}

1624

}

1625

close(devnull);

1626

}

1627

return true;

1628

}

1629

1630

error_t bring_up_interface(const char *const interface,

1631

const float delay){

1632

int sd = -1;

1633

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1636

struct ifreq network;

1637

unsigned int if_index = if_nametoindex(interface);

1638

if(if_index == 0){

1639

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

1640

errno = old_errno;

1641

return ENXIO;

1642

}

1643

1644

if(quit_now){

1645

errno = old_errno;

1646

return EINTR;

1647

}

1648

1649

if(not interface_is_up(interface)){

1650

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

1651

ret_errno = errno;

1652

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

1653

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

1654

return ret_errno;

1655

}

1656

network.ifr_flags |= IFF_UP;

1657

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1660

ret_errno = errno;

1661

perror_plus("socket");

1662

errno = old_errno;

1663

return ret_errno;

1664

}

1665

1666

if(quit_now){

1667

close(sd);

1668

errno = old_errno;

1669

return EINTR;

1670

}

1671

1672

if(debug){

1673

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

1674

interface);

1675

}

1676

1677

/* Raise priviliges */

1678

raise_privileges();

1679

1680

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

int ret_linux = klogctl(8, NULL, 5);

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1688

}

1689

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1692

#ifdef __linux__

1693

if(restore_loglevel){

1694

ret_linux = klogctl(7, NULL, 0);

1695

if(ret_linux == -1){

1696

perror_plus("klogctl");

1697

}

1698

}

1699

#endif /* __linux__ */

1700

1701

/* Lower privileges */

1702

lower_privileges();

1703

1704

/* Close the socket */

1705

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

1706

if(ret == -1){

1707

perror_plus("close");

1708

}

1709

1710

if(ret_setflags == -1){

1711

errno = ret_errno;

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1713

errno = old_errno;

1714

return ret_errno;

1715

}

1716

} else if(debug){

1717

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

1718

interface);

1719

}

1720

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

if(interface_is_running(interface)){

1725

break;

1726

}

1727

struct timespec sleeptime = { .tv_nsec = 250000000 };

1728

ret = nanosleep(&sleeptime, NULL);

1729

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

1730

perror_plus("nanosleep");

1731

}

1732

}

1733

1734

errno = old_errno;

1735

return 0;

1736

}

1737

1738

error_t take_down_interface(const char *const interface){

1739

error_t old_errno = errno;

1740

struct ifreq network;

1741

unsigned int if_index = if_nametoindex(interface);

1742

if(if_index == 0){

1743

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

1744

errno = old_errno;

1745

return ENXIO;

1746

}

1747

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1749

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

1750

ret_errno = errno;

1751

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

1752

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

1753

return ret_errno;

1754

}

1755

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

1756

1757

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

1758

if(sd < 0){

1759

ret_errno = errno;

1760

perror_plus("socket");

1761

errno = old_errno;

1762

return ret_errno;

1763

}

1764

1765

if(debug){

1766

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

1767

interface);

1768

}

1769

1770

/* Raise priviliges */

1771

raise_privileges();

1772

1773

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

1774

ret_errno = errno;

1775

1776

/* Lower privileges */

1777

lower_privileges();

1778

1779

/* Close the socket */

1780

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

1781

if(ret == -1){

1782

perror_plus("close");

1783

}

1784

1785

if(ret_setflags == -1){

1786

errno = ret_errno;

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

errno = old_errno;

1789

return ret_errno;

1790

}

1791

} else if(debug){

1792

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

1793

interface);

1794

}

1795

1796

errno = old_errno;

1797

return 0;

1798

}

1799

1800

1122

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

1801

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1802

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

1803

"+CTYPE-OPENPGP", .current_server = NULL,

1804

.interfaces = NULL, .interfaces_size = 0 };

1805

1123

AvahiSServiceBrowser *sb = NULL;

1806

error_t ret_errno;

1124

int error;

1807

1125

int ret;

1808

1126

intmax_t tmpmax;

1809

1127

char *tmp;

1810

1128

int exitcode = EXIT_SUCCESS;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1129

const char *interface = "";

1130

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

1133

uid_t uid;

1134

gid_t gid;

1813

1135

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

1814

1136

bool tempdir_created = false;

1815

1137

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1816

1138

const char *seckey = PATHDIR "/" SECKEY;

1817

1139

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1819

1140

1820

1141

bool gnutls_initialized = false;

1821

1142

bool gpgme_initialized = false;

1822

1143

float delay = 2.5f;

1823

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

1824

retrying the same server again */

1825

1144

1826

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1827

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1833

1152

errno = 0;

1834

1153

ret = setgid(gid);

1835

1154

if(ret == -1){

1836

perror_plus("setgid");

1155

perror("setgid");

1837

1156

}

1838

1157

1839

1158

/* Lower user privileges (temporarily) */

1840

1159

errno = 0;

1841

1160

ret = seteuid(uid);

1842

1161

if(ret == -1){

1843

perror_plus("seteuid");

1162

perror("seteuid");

1844

1163

}

1845

1164

1846

1165

if(quit_now){

1881

1200

.arg = "SECONDS",

1882

1201

.doc = "Maximum delay to wait for interface startup",

1883

1202

.group = 2 },

1884

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

1885

.arg = "SECONDS",

1886

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

1887

.group = 2 },

1888

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

1889

.arg = "DIR",

1890

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

1891

.group = 2 },

1892

1203

/*

1893

1204

* These reproduce what we would get without ARGP_NO_HELP

1894

1205

*/

1912

1223

connect_to = arg;

1913

1224

break;

1914

1225

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

1915

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

1916

arg, (int)',');

1917

if(ret_errno != 0){

1918

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

1919

}

1226

interface = arg;

1920

1227

break;

1921

1228

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

1922

1229

seckey = arg;

1942

1249

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

1943

1250

argp_error(state, "Bad delay");

1944

1251

}

1945

case 132: /* --retry */

1946

errno = 0;

1947

retry_interval = strtod(arg, &tmp);

1948

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

1949

or (retry_interval * 1000) > INT_MAX

1950

or retry_interval < 0){

1951

argp_error(state, "Bad retry interval");

1952

}

1953

break;

1954

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

1955

hookdir = arg;

1956

1252

break;

1957

1253

/*

1958

1254

* These reproduce what we would get without ARGP_NO_HELP

1965

1261

argp_state_help(state, state->out_stream,

1966

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1967

1263

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

1968

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

1264

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

1969

1265

exit(argp_err_exit_status);

1970

1266

break;

1971

1267

default:

1986

1282

case ENOMEM:

1987

1283

default:

1988

1284

errno = ret;

1989

perror_plus("argp_parse");

1285

perror("argp_parse");

1990

1286

exitcode = EX_OSERR;

1991

1287

goto end;

1992

1288

case EINVAL:

1994

1290

goto end;

1995

1291

}

1996

1292

}

1997

1998

{

1999

/* Work around Debian bug #633582:

2000

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

2001

2002

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2004

struct stat st;

2005

2006

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

2007

int seckey_fd = open(seckey, O_RDONLY);

2008

if(seckey_fd == -1){

2009

perror_plus("open");

2010

} else {

2011

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

2012

if(ret == -1){

2013

perror_plus("fstat");

2014

} else {

2015

if(S_ISREG(st.st_mode)

2016

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

2017

ret = fchown(seckey_fd, uid, gid);

2018

if(ret == -1){

2019

perror_plus("fchown");

2020

}

2021

}

2022

}

2023

TEMP_FAILURE_RETRY(close(seckey_fd));

2024

}

2025

}

2026

2027

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

2028

int pubkey_fd = open(pubkey, O_RDONLY);

2029

if(pubkey_fd == -1){

2030

perror_plus("open");

2031

} else {

2032

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

2033

if(ret == -1){

2034

perror_plus("fstat");

2035

} else {

2036

if(S_ISREG(st.st_mode)

2037

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

2038

ret = fchown(pubkey_fd, uid, gid);

2039

if(ret == -1){

2040

perror_plus("fchown");

2041

}

2042

}

2043

}

2044

TEMP_FAILURE_RETRY(close(pubkey_fd));

2045

}

2046

}

2047

2048

/* Lower privileges */

2049

lower_privileges();

2050

}

2051

}

2052

2053

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

2054

{

2055

char *interface = NULL;

2056

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

2057

interface))){

2058

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

2059

and if_nametoindex(interface) == 0){

2060

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

2061

fprintf_plus(stderr, "Not using nonexisting interface"

2062

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

2063

}

2064

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

2065

interface = NULL;

2066

}

2067

}

2068

}

2069

2070

/* Run network hooks */

2071

{

2072

if(mc.interfaces != NULL){

2073

interfaces_hooks = malloc(mc.interfaces_size);

2074

if(interfaces_hooks == NULL){

2075

perror_plus("malloc");

2076

goto end;

2077

}

2078

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

2079

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

2080

}

2081

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

2085

}

2086

1293

2087

1294

if(not debug){

2088

1295

avahi_set_log_function(empty_log);

2089

1296

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

2090

1322

2091

1323

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

2092

1324

from the signal handler */

2093

1325

/* Initialize the pseudo-RNG for Avahi */

2094

1326

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

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

2097

fprintf_plus(stderr,

2098

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

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

2099

1330

exitcode = EX_UNAVAILABLE;

2100

1331

goto end;

2101

1332

}

2103

1334

sigemptyset(&sigterm_action.sa_mask);

2104

1335

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

2105

1336

if(ret == -1){

2106

perror_plus("sigaddset");

1337

perror("sigaddset");

2107

1338

exitcode = EX_OSERR;

2108

1339

goto end;

2109

1340

}

2110

1341

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

2111

1342

if(ret == -1){

2112

perror_plus("sigaddset");

1343

perror("sigaddset");

2113

1344

exitcode = EX_OSERR;

2114

1345

goto end;

2115

1346

}

2116

1347

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

2117

1348

if(ret == -1){

2118

perror_plus("sigaddset");

1349

perror("sigaddset");

2119

1350

exitcode = EX_OSERR;

2120

1351

goto end;

2121

1352

}

2125

1356

*/

2126

1357

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

2127

1358

if(ret == -1){

2128

perror_plus("sigaction");

1359

perror("sigaction");

2129

1360

return EX_OSERR;

2130

1361

}

2131

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

2132

1363

ret = sigaction(SIGINT, &sigterm_action, NULL);

2133

1364

if(ret == -1){

2134

perror_plus("sigaction");

1365

perror("sigaction");

2135

1366

exitcode = EX_OSERR;

2136

1367

goto end;

2137

1368

}

2138

1369

}

2139

1370

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

2140

1371

if(ret == -1){

2141

perror_plus("sigaction");

1372

perror("sigaction");

2142

1373

return EX_OSERR;

2143

1374

}

2144

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

2145

1376

ret = sigaction(SIGHUP, &sigterm_action, NULL);

2146

1377

if(ret == -1){

2147

perror_plus("sigaction");

1378

perror("sigaction");

2148

1379

exitcode = EX_OSERR;

2149

1380

goto end;

2150

1381

}

2151

1382

}

2152

1383

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

2153

1384

if(ret == -1){

2154

perror_plus("sigaction");

1385

perror("sigaction");

2155

1386

return EX_OSERR;

2156

1387

}

2157

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

2158

1389

ret = sigaction(SIGTERM, &sigterm_action, NULL);

2159

1390

if(ret == -1){

2160

perror_plus("sigaction");

1391

perror("sigaction");

2161

1392

exitcode = EX_OSERR;

2162

1393

goto end;

2163

1394

}

2164

1395

}

2165

1396

2166

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

2167

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2169

/* Look for any good interfaces */

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2171

alphasort);

2172

if(ret >= 1){

2173

/* Add all found interfaces to interfaces list */

2174

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

2175

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

2176

direntries[i]->d_name);

2177

if(ret_errno != 0){

2178

errno = ret_errno;

2179

perror_plus("argz_add");

2180

continue;

2181

}

2182

if(debug){

2183

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

2184

direntries[i]->d_name);

2185

}

2186

}

2187

free(direntries);

1397

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

#ifdef __linux__

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1420

ret = klogctl(8, NULL, 5);

1421

bool restore_loglevel = true;

1422

if(ret == -1){

1423

restore_loglevel = false;

1424

perror("klogctl");

1425

}

1426

#endif /* __linux__ */

1427

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

if(sd < 0){

1430

perror("socket");

1431

exitcode = EX_OSERR;

1432

#ifdef __linux__

1433

if(restore_loglevel){

1434

ret = klogctl(7, NULL, 0);

1435

if(ret == -1){

1436

perror("klogctl");

1437

}

1438

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

goto end;

1447

}

1448

strcpy(network.ifr_name, interface);

1449

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

1450

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1452

#ifdef __linux__

1453

if(restore_loglevel){

1454

ret = klogctl(7, NULL, 0);

1455

if(ret == -1){

1456

perror("klogctl");

1457

}

1458

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1467

goto end;

1468

}

1469

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

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

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

1473

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1477

#ifdef __linux__

1478

if(restore_loglevel){

1479

ret = klogctl(7, NULL, 0);

1480

if(ret == -1){

1481

perror("klogctl");

1482

}

1483

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

goto end;

1492

}

1493

}

1494

/* sleep checking until interface is running */

1495

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

1496

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

1497

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_RUNNING){

1500

break;

1501

}

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

ret = nanosleep(&sleeptime, NULL);

1504

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

1505

perror("nanosleep");

1506

}

1507

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1514

}

1515

#ifdef __linux__

1516

if(restore_loglevel){

1517

/* Restores kernel loglevel to default */

1518

ret = klogctl(7, NULL, 0);

1519

if(ret == -1){

1520

perror("klogctl");

1521

}

1522

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

2188

1532

} else {

2189

free(direntries);

2190

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

2191

exitcode = EXIT_FAILURE;

2192

goto end;

2193

}

2194

}

2195

2196

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

2197

{

2198

char *interface = NULL;

2199

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

2200

interface))){

2201

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

2202

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

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

while((interface = argz_next(mc.interfaces,

2208

mc.interfaces_size, interface))){

2209

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

2210

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

2211

interface);

2212

interface = NULL;

2213

}

2214

}

2215

break;

2216

}

2217

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2219

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2222

perror_plus("Failed to bring up interface");

2223

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2229

perror_plus("argz_add");

2230

}

2231

}

2232

}

2233

}

2234

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

2235

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

2236

}

2237

}

2238

2239

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

2240

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

2241

if(debug){

2242

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

2243

mc.interfaces);

2244

}

2245

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

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

2246

1539

}

2247

1540

2248

1541

if(quit_now){

2249

1542

goto end;

2250

1543

}

2251

1544

2252

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

1545

ret = init_gnutls_global(pubkey, seckey);

2253

1546

if(ret == -1){

2254

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

1547

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

2255

1548

exitcode = EX_UNAVAILABLE;

2256

1549

goto end;

2257

1550

} else {

2262

1555

goto end;

2263

1556

}

2264

1557

1558

tempdir_created = true;

2265

1559

if(mkdtemp(tempdir) == NULL){

2266

perror_plus("mkdtemp");

1560

tempdir_created = false;

1561

perror("mkdtemp");

2267

1562

goto end;

2268

1563

}

2269

tempdir_created = true;

2270

1564

2271

1565

if(quit_now){

2272

1566

goto end;

2273

1567

}

2274

1568

2275

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

2276

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

1569

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

1570

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

2277

1571

exitcode = EX_UNAVAILABLE;

2278

1572

goto end;

2279

1573

} else {

2288

1582

/* Connect directly, do not use Zeroconf */

2289

1583

/* (Mainly meant for debugging) */

2290

1584

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

2291

2292

1585

if(address == NULL){

2293

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

1586

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

2294

1587

exitcode = EX_USAGE;

2295

1588

goto end;

2296

1589

}

2299

1592

goto end;

2300

1593

}

2301

1594

2302

in_port_t port;

1595

uint16_t port;

2303

1596

errno = 0;

2304

1597

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

2305

1598

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

2306

or tmpmax != (in_port_t)tmpmax){

2307

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

1599

or tmpmax != (uint16_t)tmpmax){

1600

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

2308

1601

exitcode = EX_USAGE;

2309

1602

goto end;

2310

1603

}

2311

1604

2312

1605

if(quit_now){

2313

1606

goto end;

2314

1607

}

2315

1608

2316

port = (in_port_t)tmpmax;

1609

port = (uint16_t)tmpmax;

2317

1610

*address = '\0';

1611

address = connect_to;

2318

1612

/* Colon in address indicates IPv6 */

2319

1613

int af;

2320

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

1614

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

2321

1615

af = AF_INET6;

2322

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

2323

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

2324

{

2325

connect_to++;

2326

address[-1] = '\0';

2327

}

2328

1616

} else {

2329

1617

af = AF_INET;

2330

1618

}

2331

address = connect_to;

2332

1619

2333

1620

if(quit_now){

2334

1621

goto end;

2335

1622

}

2336

1623

2337

1624

while(not quit_now){

2338

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

2339

&mc);

1625

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

2340

1626

if(quit_now or ret == 0){

2341

1627

break;

2342

1628

}

2343

if(debug){

2344

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

2345

(int)retry_interval);

2346

}

2347

sleep((unsigned int)retry_interval);

2348

}

2349

1629

sleep(15);

1630

};

1631

2350

1632

if (not quit_now){

2351

1633

exitcode = EXIT_SUCCESS;

2352

1634

}

2353

1635

2354

1636

goto end;

2355

1637

}

2356

1638

2368

1650

config.publish_domain = 0;

2369

1651

2370

1652

/* Allocate a new server */

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

1653

mc.server = avahi_server_new(avahi_simple_poll_get

1654

(mc.simple_poll), &config, NULL,

1655

NULL, &error);

2373

1656

2374

1657

/* Free the Avahi configuration data */

2375

1658

avahi_server_config_free(&config);

2377

1660

2378

1661

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

2379

1662

if(mc.server == NULL){

2380

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

2381

avahi_strerror(ret_errno));

1663

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

1664

avahi_strerror(error));

2382

1665

exitcode = EX_UNAVAILABLE;

2383

1666

goto end;

2384

1667

}

2390

1673

/* Create the Avahi service browser */

2391

1674

sb = avahi_s_service_browser_new(mc.server, if_index,

2392

1675

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

1676

NULL, 0, browse_callback, NULL);

2395

1677

if(sb == NULL){

2396

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

2397

avahi_strerror(avahi_server_errno(mc.server)));

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2398

1680

exitcode = EX_UNAVAILABLE;

2399

1681

goto end;

2400

1682

}

2406

1688

/* Run the main loop */

2407

1689

2408

1690

if(debug){

2409

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

2410

}

2411

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2414

if(debug){

2415

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

2416

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

2417

}

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2418

1695

2419

1696

end:

2420

1697

2421

1698

if(debug){

2422

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

1699

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

2423

1700

}

2424

1701

2425

1702

/* Cleanup things */

2426

free(mc.interfaces);

2427

2428

1703

if(sb != NULL)

2429

1704

avahi_s_service_browser_free(sb);

2430

1705

2431

1706

if(mc.server != NULL)

2432

1707

avahi_server_free(mc.server);

2433

1708

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

1709

if(mc.simple_poll != NULL)

1710

avahi_simple_poll_free(mc.simple_poll);

2436

1711

2437

1712

if(gnutls_initialized){

2438

1713

gnutls_certificate_free_credentials(mc.cred);

2444

1719

gpgme_release(mc.ctx);

2445

1720

}

2446

1721

2447

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

2448

has seen */

2449

if(mc.current_server != NULL){

2450

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

2451

while(mc.current_server != NULL){

2452

server *next = mc.current_server->next;

2453

free(mc.current_server);

2454

mc.current_server = next;

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

2455

1729

}

2456

}

2457

2458

/* Re-raise priviliges */

2459

{

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2476

1739

}

2477

1740

}

2478

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

2479

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

2480

" down\n");

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

2481

1750

}

2482

1751

}

2483

2484

lower_privileges_permanently();

2485

1752

}

2486

1753

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2489

2490

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

1754

/* Removes the temp directory used by GPGME */

2491

1755

if(tempdir_created){

2492

struct dirent **direntries = NULL;

2493

struct dirent *direntry = NULL;

2494

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

2495

alphasort);

2496

if (numentries > 0){

2497

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

2498

direntry = direntries[i];

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

and (direntry->d_name[1] == '\0'

1772

or (direntry->d_name[1] == '.'

1773

and direntry->d_name[2] == '\0'))){

1774

continue;

1775

}

2499

1776

char *fullname = NULL;

2500

1777

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

2501

1778

direntry->d_name);

2502

1779

if(ret < 0){

2503

perror_plus("asprintf");

1780

perror("asprintf");

2504

1781

continue;

2505

1782

}

2506

1783

ret = remove(fullname);

2507

1784

if(ret == -1){

2508

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

2509

strerror(errno));

1785

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

1786

strerror(errno));

2510

1787

}

2511

1788

free(fullname);

2512

1789

}

2513

}

2514

2515

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

2516

free(direntries);

2517

if (numentries == -1){

2518

perror_plus("scandir");

1790

closedir(d);

2519

1791

}

2520

1792

ret = rmdir(tempdir);

2521

1793

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

2522

perror_plus("rmdir");

1794

perror("rmdir");

2523

1795

}

2524

1796

}

2525

1797

2530

1802

&old_sigterm_action,

2531

1803

NULL));

2532

1804

if(ret == -1){

2533

perror_plus("sigaction");

1805

perror("sigaction");

2534

1806

}

2535

1807

do {

2536

1808

ret = raise(signal_received);

2537

1809

} while(ret != 0 and errno == EINTR);

2538

1810

if(ret != 0){

2539

perror_plus("raise");

1811

perror("raise");

2540

1812

abort();

2541

1813

}

2542

1814

TEMP_FAILURE_RETRY(pause());