/mandos/trunk : revision 533

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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stdout, ferror(), remove() */

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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, EXIT_FAILURE,

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srand(), strtof() */

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

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strtof(), abort() */

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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*/

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

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getuid(), getgid(), setuid(),

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setgid() */

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

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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, inet_ntop() */

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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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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sigaction,

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sig_atomic_t */

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sigaction(), SIGTERM, sig_atomic_t,

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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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#ifdef __linux__

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93

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

105

111

init_gnutls_session(),

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112

GNUTLS_* */

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113

#include <gnutls/openpgp.h>

108

/* 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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118

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

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126

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

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127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

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

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130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

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133

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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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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151

typedef struct {

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156

gnutls_dh_params_t dh_params;

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157

const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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160

} mandos_context;

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161

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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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164

.dh_bits = 1024, .priority = "SECURE256"

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

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

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.current_server = NULL };

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168

sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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

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program_invocation_short_name);

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perror(print_text);

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}

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178

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

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

180

va_list ap;

181

va_start (ap, format);

182

183

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

184

program_invocation_short_name));

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

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}

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/*

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189

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

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* "buffer_length" is how much is already used.

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192

*/

150

193

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

194

size_t buffer_capacity){

152

195

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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196

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

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197

if(buffer == NULL){

159

202

return buffer_capacity;

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203

}

161

204

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

206

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

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int af){

208

int ret;

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

210

if(new_server == NULL){

211

perror_plus("malloc");

212

return false;

213

}

214

*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){

219

perror_plus("strdup");

220

return false;

221

}

222

/* Special case of first server */

223

if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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} else {

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

236

perror_plus("clock_gettime");

237

return false;

238

}

239

return true;

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}

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/*

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243

* Initialize GPGME.

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244

*/

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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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int ret;

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

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const char *tempdir){

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gpgme_error_t rc;

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248

gpgme_engine_info_t engine_info;

170

249

173

252

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

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253

*/

175

254

bool import_key(const char *filename){

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int ret;

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int fd;

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257

gpgme_data_t pgp_data;

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258

179

259

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

180

260

if(fd == -1){

181

perror("open");

261

perror_plus("open");

182

262

return false;

183

263

}

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264

185

265

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

266

if(rc != GPG_ERR_NO_ERROR){

187

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

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gpgme_strsource(rc), gpgme_strerror(rc));

267

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

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gpgme_strsource(rc), gpgme_strerror(rc));

189

269

return false;

190

270

}

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271

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rc = gpgme_op_import(mc.ctx, pgp_data);

193

273

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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if(ret == -1){

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perror("close");

281

perror_plus("close");

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282

}

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283

gpgme_data_release(pgp_data);

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return true;

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285

}

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if(debug){

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

288

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

215

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

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gpgme_strsource(rc), gpgme_strerror(rc));

295

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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return false;

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298

}

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299

220

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

300

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

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301

rc = gpgme_get_engine_info(&engine_info);

222

302

if(rc != GPG_ERR_NO_ERROR){

223

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

225

305

return false;

226

306

}

227

307

while(engine_info != NULL){

233

313

engine_info = engine_info->next;

234

314

}

235

315

if(engine_info == NULL){

236

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

316

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

317

tempdir);

237

318

return false;

238

319

}

239

320

240

321

/* Create new GPGME "context" */

241

322

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

242

323

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

324

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

325

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

326

gpgme_strerror(rc));

245

327

return false;

246

328

}

247

329

249

331

return false;

250

332

}

251

333

252

return true;

334

return true;

253

335

}

254

336

255

337

/*

266

348

ssize_t plaintext_length = 0;

267

349

268

350

if(debug){

269

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

351

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

270

352

}

271

353

272

354

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

273

355

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

356

0);

275

357

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

358

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

359

gpgme_strsource(rc), gpgme_strerror(rc));

278

360

return -1;

279

361

}

280

362

281

363

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

282

364

rc = gpgme_data_new(&dh_plain);

283

365

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

366

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

367

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

368

gpgme_strsource(rc), gpgme_strerror(rc));

286

369

gpgme_data_release(dh_crypto);

287

370

return -1;

288

371

}

291

374

data buffer */

292

375

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

293

376

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

296

379

plaintext_length = -1;

297

380

if(debug){

298

381

gpgme_decrypt_result_t result;

299

382

result = gpgme_op_decrypt_result(mc.ctx);

300

383

if(result == NULL){

301

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

384

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

302

385

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

386

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

387

result->unsupported_algorithm);

388

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

389

result->wrong_key_usage);

307

390

if(result->file_name != NULL){

308

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

391

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

309

392

}

310

393

gpgme_recipient_t recipient;

311

394

recipient = result->recipients;

312

if(recipient){

313

while(recipient != NULL){

314

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

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

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

317

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

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

395

while(recipient != NULL){

396

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

397

gpgme_pubkey_algo_name

398

(recipient->pubkey_algo));

399

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

400

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

401

recipient->status == GPG_ERR_NO_SECKEY

402

? "No" : "Yes");

403

recipient = recipient->next;

322

404

}

323

405

}

324

406

}

326

408

}

327

409

328

410

if(debug){

329

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

411

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

330

412

}

331

413

332

414

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

333

415

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

334

perror("gpgme_data_seek");

416

perror_plus("gpgme_data_seek");

335

417

plaintext_length = -1;

336

418

goto decrypt_end;

337

419

}

339

421

*plaintext = NULL;

340

422

while(true){

341

423

plaintext_capacity = incbuffer(plaintext,

342

(size_t)plaintext_length,

343

plaintext_capacity);

424

(size_t)plaintext_length,

425

plaintext_capacity);

344

426

if(plaintext_capacity == 0){

345

perror("incbuffer");

346

plaintext_length = -1;

347

goto decrypt_end;

427

perror_plus("incbuffer");

428

plaintext_length = -1;

429

goto decrypt_end;

348

430

}

349

431

350

432

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

355

437

break;

356

438

}

357

439

if(ret < 0){

358

perror("gpgme_data_read");

440

perror_plus("gpgme_data_read");

359

441

plaintext_length = -1;

360

442

goto decrypt_end;

361

443

}

363

445

}

364

446

365

447

if(debug){

366

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

448

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

367

449

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

368

450

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

369

451

}

391

473

/* GnuTLS log function callback */

392

474

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

393

475

const char* string){

394

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

476

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

395

477

}

396

478

397

479

static int init_gnutls_global(const char *pubkeyfilename,

399

481

int ret;

400

482

401

483

if(debug){

402

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

484

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

403

485

}

404

486

405

487

ret = gnutls_global_init();

406

488

if(ret != GNUTLS_E_SUCCESS){

407

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

408

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

409

491

return -1;

410

492

}

411

493

418

500

}

419

501

420

502

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

504

if(ret != GNUTLS_E_SUCCESS){

423

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

424

from

425

-Wunreachable-code

426

*/

427

safer_gnutls_strerror(ret));

505

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

506

safer_gnutls_strerror(ret));

428

507

gnutls_global_deinit();

429

508

return -1;

430

509

}

431

510

432

511

if(debug){

433

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

434

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

435

seckeyfilename);

512

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

513

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

514

pubkeyfilename,

515

seckeyfilename);

436

516

}

437

517

438

518

ret = gnutls_certificate_set_openpgp_key_file

439

519

(mc.cred, pubkeyfilename, seckeyfilename,

440

520

GNUTLS_OPENPGP_FMT_BASE64);

441

521

if(ret != GNUTLS_E_SUCCESS){

442

fprintf(stderr,

443

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

444

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

445

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

446

safer_gnutls_strerror(ret));

522

fprintf_plus(stderr,

523

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

524

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

525

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

526

safer_gnutls_strerror(ret));

447

527

goto globalfail;

448

528

}

449

529

450

530

/* GnuTLS server initialization */

451

531

ret = gnutls_dh_params_init(&mc.dh_params);

452

532

if(ret != GNUTLS_E_SUCCESS){

453

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

454

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

533

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

" initialization: %s\n",

535

safer_gnutls_strerror(ret));

455

536

goto globalfail;

456

537

}

457

538

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

458

539

if(ret != GNUTLS_E_SUCCESS){

459

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

460

safer_gnutls_strerror(ret));

540

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

541

safer_gnutls_strerror(ret));

461

542

goto globalfail;

462

543

}

463

544

476

557

static int init_gnutls_session(gnutls_session_t *session){

477

558

int ret;

478

559

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

560

do {

561

ret = gnutls_init(session, GNUTLS_SERVER);

562

if(quit_now){

563

return -1;

564

}

565

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

480

566

if(ret != GNUTLS_E_SUCCESS){

481

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

482

safer_gnutls_strerror(ret));

567

fprintf_plus(stderr,

568

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

569

safer_gnutls_strerror(ret));

483

570

}

484

571

485

572

{

486

573

const char *err;

487

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

574

do {

575

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

576

if(quit_now){

577

gnutls_deinit(*session);

578

return -1;

579

}

580

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

488

581

if(ret != GNUTLS_E_SUCCESS){

489

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

490

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

491

safer_gnutls_strerror(ret));

582

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

583

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

584

safer_gnutls_strerror(ret));

492

585

gnutls_deinit(*session);

493

586

return -1;

494

587

}

495

588

}

496

589

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

590

do {

591

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

592

mc.cred);

593

if(quit_now){

594

gnutls_deinit(*session);

595

return -1;

596

}

597

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

499

598

if(ret != GNUTLS_E_SUCCESS){

500

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

501

safer_gnutls_strerror(ret));

599

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

600

safer_gnutls_strerror(ret));

502

601

gnutls_deinit(*session);

503

602

return -1;

504

603

}

505

604

506

605

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

606

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

607

510

608

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

609

520

618

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

521

619

AvahiIfIndex if_index,

522

620

int af){

523

int ret, tcp_sd;

621

int ret, tcp_sd = -1;

524

622

ssize_t sret;

525

623

union {

526

624

struct sockaddr_in in;

527

625

struct sockaddr_in6 in6;

528

626

} to;

529

627

char *buffer = NULL;

530

char *decrypted_buffer;

628

char *decrypted_buffer = NULL;

531

629

size_t buffer_length = 0;

532

630

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

631

size_t written;

535

int retval = 0;

632

int retval = -1;

536

633

gnutls_session_t session;

537

634

int pf; /* Protocol family */

538

635

636

errno = 0;

637

638

if(quit_now){

639

errno = EINTR;

640

return -1;

641

}

642

539

643

switch(af){

540

644

case AF_INET6:

541

645

pf = PF_INET6;

544

648

pf = PF_INET;

545

649

break;

546

650

default:

547

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

651

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

652

errno = EINVAL;

548

653

return -1;

549

654

}

550

655

554

659

}

555

660

556

661

if(debug){

557

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

558

"\n", ip, port);

662

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

663

PRIu16 "\n", ip, port);

559

664

}

560

665

561

666

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

667

if(tcp_sd < 0){

563

perror("socket");

564

return -1;

668

int e = errno;

669

perror_plus("socket");

670

errno = e;

671

goto mandos_end;

672

}

673

674

if(quit_now){

675

errno = EINTR;

676

goto mandos_end;

565

677

}

566

678

567

679

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

568

680

if(af == AF_INET6){

569

to.in6.sin6_family = (uint16_t)af;

681

to.in6.sin6_family = (sa_family_t)af;

570

682

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

571

683

} else { /* IPv4 */

572

684

to.in.sin_family = (sa_family_t)af;

573

685

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

574

686

}

575

687

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

688

int e = errno;

689

perror_plus("inet_pton");

690

errno = e;

691

goto mandos_end;

578

692

}

579

693

if(ret == 0){

580

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

581

return -1;

694

int e = errno;

695

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

696

errno = e;

697

goto mandos_end;

582

698

}

583

699

if(af == AF_INET6){

584

700

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

587

703

588

704

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

589

705

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

590

-Wunreachable-code*/

706

-Wunreachable-code*/

591

707

if(if_index == AVAHI_IF_UNSPEC){

592

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

593

" without a network interface\n");

594

return -1;

708

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

709

" incomplete without a network interface\n");

710

errno = EINVAL;

711

goto mandos_end;

595

712

}

596

713

/* Set the network interface number as scope */

597

714

to.in6.sin6_scope_id = (uint32_t)if_index;

602

719

-Wunreachable-code */

603

720

}

604

721

722

if(quit_now){

723

errno = EINTR;

724

goto mandos_end;

725

}

726

605

727

if(debug){

606

728

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

607

729

char interface[IF_NAMESIZE];

608

730

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

609

perror("if_indextoname");

731

perror_plus("if_indextoname");

610

732

} else {

611

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

612

ip, interface, port);

733

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

734

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

613

735

}

614

736

} else {

615

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

616

port);

737

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

738

ip, port);

617

739

}

618

740

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

619

741

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

626

748

sizeof(addrstr));

627

749

}

628

750

if(pcret == NULL){

629

perror("inet_ntop");

751

perror_plus("inet_ntop");

630

752

} else {

631

753

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

632

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

754

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

633

755

}

634

756

}

635

757

}

636

758

759

if(quit_now){

760

errno = EINTR;

761

goto mandos_end;

762

}

763

637

764

if(af == AF_INET6){

638

765

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

639

766

} else {

640

767

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

641

768

}

642

769

if(ret < 0){

643

perror("connect");

644

return -1;

770

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

771

int e = errno;

772

perror_plus("connect");

773

errno = e;

774

}

775

goto mandos_end;

776

}

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

645

781

}

646

782

647

783

const char *out = mandos_protocol_version;

649

785

while(true){

650

786

size_t out_size = strlen(out);

651

787

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

652

out_size - written));

788

out_size - written));

653

789

if(ret == -1){

654

perror("write");

655

retval = -1;

790

int e = errno;

791

perror_plus("write");

792

errno = e;

656

793

goto mandos_end;

657

794

}

658

795

written += (size_t)ret;

666

803

break;

667

804

}

668

805

}

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

669

811

}

670

812

671

813

if(debug){

672

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

673

}

674

814

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

815

}

816

817

if(quit_now){

818

errno = EINTR;

819

goto mandos_end;

820

}

821

822

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

675

823

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

824

677

do{

825

if(quit_now){

826

errno = EINTR;

827

goto mandos_end;

828

}

829

830

do {

678

831

ret = gnutls_handshake(session);

832

if(quit_now){

833

errno = EINTR;

834

goto mandos_end;

835

}

679

836

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

680

837

681

838

if(ret != GNUTLS_E_SUCCESS){

682

839

if(debug){

683

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

840

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

684

841

gnutls_perror(ret);

685

842

}

686

retval = -1;

843

errno = EPROTO;

687

844

goto mandos_end;

688

845

}

689

846

690

847

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

691

848

692

849

if(debug){

693

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

694

ip);

850

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

851

" %s\n", ip);

695

852

}

696

853

697

854

while(true){

855

856

if(quit_now){

857

errno = EINTR;

858

goto mandos_end;

859

}

860

698

861

buffer_capacity = incbuffer(&buffer, buffer_length,

699

buffer_capacity);

862

buffer_capacity);

700

863

if(buffer_capacity == 0){

701

perror("incbuffer");

702

retval = -1;

864

int e = errno;

865

perror_plus("incbuffer");

866

errno = e;

867

goto mandos_end;

868

}

869

870

if(quit_now){

871

errno = EINTR;

703

872

goto mandos_end;

704

873

}

705

874

714

883

case GNUTLS_E_AGAIN:

715

884

break;

716

885

case GNUTLS_E_REHANDSHAKE:

717

do{

886

do {

718

887

ret = gnutls_handshake(session);

888

889

if(quit_now){

890

errno = EINTR;

891

goto mandos_end;

892

}

719

893

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

720

894

if(ret < 0){

721

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

895

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

896

"***\n");

722

897

gnutls_perror(ret);

723

retval = -1;

898

errno = EPROTO;

724

899

goto mandos_end;

725

900

}

726

901

break;

727

902

default:

728

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

729

" encrypted session with Mandos server\n");

730

retval = -1;

903

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

904

" encrypted session with Mandos server\n");

731

905

gnutls_bye(session, GNUTLS_SHUT_RDWR);

906

errno = EIO;

732

907

goto mandos_end;

733

908

}

734

909

} else {

737

912

}

738

913

739

914

if(debug){

740

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

741

}

742

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

915

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

916

}

917

918

if(quit_now){

919

errno = EINTR;

920

goto mandos_end;

921

}

922

923

do {

924

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

if(quit_now){

926

errno = EINTR;

927

goto mandos_end;

928

}

929

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

744

930

745

931

if(buffer_length > 0){

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

buffer_length,

932

ssize_t decrypted_buffer_size;

933

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

748

934

&decrypted_buffer);

749

935

if(decrypted_buffer_size >= 0){

936

750

937

written = 0;

751

938

while(written < (size_t) decrypted_buffer_size){

939

if(quit_now){

940

errno = EINTR;

941

goto mandos_end;

942

}

943

752

944

ret = (int)fwrite(decrypted_buffer + written, 1,

753

945

(size_t)decrypted_buffer_size - written,

754

946

stdout);

755

947

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

948

int e = errno;

756

949

if(debug){

757

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

758

strerror(errno));

950

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

951

strerror(errno));

759

952

}

760

retval = -1;

761

break;

953

errno = e;

954

goto mandos_end;

762

955

}

763

956

written += (size_t)ret;

764

957

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

958

retval = 0;

768

959

}

769

} else {

770

retval = -1;

771

960

}

772

961

773

962

/* Shutdown procedure */

774

963

775

964

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

965

{

966

int e = errno;

967

free(decrypted_buffer);

968

free(buffer);

969

if(tcp_sd >= 0){

970

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

971

}

972

if(ret == -1){

973

if(e == 0){

974

e = errno;

975

}

976

perror_plus("close");

977

}

978

gnutls_deinit(session);

979

errno = e;

980

if(quit_now){

981

errno = EINTR;

982

retval = -1;

983

}

780

984

}

781

gnutls_deinit(session);

782

985

return retval;

783

986

}

784

987

801

1004

/* Called whenever a service has been resolved successfully or

802

1005

timed out */

803

1006

1007

if(quit_now){

1008

return;

1009

}

1010

804

1011

switch(event){

805

1012

default:

806

1013

case AVAHI_RESOLVER_FAILURE:

807

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

808

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

809

avahi_strerror(avahi_server_errno(mc.server)));

1014

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

1015

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

1016

domain,

1017

avahi_strerror(avahi_server_errno(mc.server)));

810

1018

break;

811

1019

812

1020

case AVAHI_RESOLVER_FOUND:

814

1022

char ip[AVAHI_ADDRESS_STR_MAX];

815

1023

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

816

1024

if(debug){

817

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

818

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

819

ip, (intmax_t)interface, port);

1025

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

1026

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

1027

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

820

1028

}

821

1029

int ret = start_mandos_communication(ip, port, interface,

822

1030

avahi_proto_to_af(proto));

823

1031

if(ret == 0){

824

1032

avahi_simple_poll_quit(mc.simple_poll);

1033

} else {

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1036

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

1037

" list\n", name);

1038

}

825

1039

}

826

1040

}

827

1041

}

843

1057

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

844

1058

is removed from the LAN */

845

1059

1060

if(quit_now){

1061

return;

1062

}

1063

846

1064

switch(event){

847

1065

default:

848

1066

case AVAHI_BROWSER_FAILURE:

849

1067

850

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

851

avahi_strerror(avahi_server_errno(mc.server)));

1068

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

852

1070

avahi_simple_poll_quit(mc.simple_poll);

853

1071

return;

854

1072

861

1079

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

862

1080

name, type, domain, protocol, 0,

863

1081

resolve_callback, NULL) == NULL)

864

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

865

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

1082

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

1083

" %s\n", name,

1084

avahi_strerror(avahi_server_errno(mc.server)));

866

1085

break;

867

1086

868

1087

case AVAHI_BROWSER_REMOVE:

871

1090

case AVAHI_BROWSER_ALL_FOR_NOW:

872

1091

case AVAHI_BROWSER_CACHE_EXHAUSTED:

873

1092

if(debug){

874

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

1093

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

1094

" searching...\n");

875

1095

}

876

1096

break;

877

1097

}

878

1098

}

879

1099

880

sig_atomic_t quit_now = 0;

881

882

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

883

static void handle_sigterm(__attribute__((unused)) int sig){

1100

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

1101

static void handle_sigterm(int sig){

884

1102

if(quit_now){

885

1103

return;

886

1104

}

887

1105

quit_now = 1;

1106

signal_received = sig;

888

1107

int old_errno = errno;

1108

/* set main loop to exit */

889

1109

if(mc.simple_poll != NULL){

890

1110

avahi_simple_poll_quit(mc.simple_poll);

891

1111

}

892

1112

errno = old_errno;

893

1113

}

894

1114

1115

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

1116

int ret;

1117

1118

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

1119

if(s < 0){

1120

perror_plus("socket");

1121

return false;

1122

}

1123

strcpy(ifr->ifr_name, ifname);

1124

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1125

if(ret == -1){

1126

if(debug){

1127

perror_plus("ioctl SIOCGIFFLAGS");

1128

}

1129

return false;

1130

}

1131

return true;

1132

}

1133

1134

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

1135

1136

/* Reject the loopback device */

1137

if(ifr->ifr_flags & IFF_LOOPBACK){

1138

if(debug){

1139

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

1140

ifname);

1141

}

1142

return false;

1143

}

1144

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

1145

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

1146

if(debug){

1147

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

1148

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

1149

}

1150

return true;

1151

}

1152

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

1153

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

1154

if(debug){

1155

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1156

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

1157

}

1158

return false;

1159

}

1160

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

1161

if(ifr->ifr_flags & IFF_NOARP){

1162

if(debug){

1163

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

1164

ifname);

1165

}

1166

return false;

1167

}

1168

1169

/* Accept this device */

1170

if(debug){

1171

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

1172

}

1173

return true;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device.

1179

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

1180

*/

1181

int good_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

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

1191

}

1192

return 0;

1193

}

1194

1195

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

1196

return 0;

1197

}

1198

return 1;

1199

}

1200

1201

/*

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1240

}

1241

return 1;

1242

}

1243

1244

int notdotentries(const struct dirent *direntry){

1245

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

1246

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

1247

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

1248

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

1249

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

1250

return 0;

1251

}

1252

return 1;

1253

}

1254

1255

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

1256

int runnable_hook(const struct dirent *direntry){

1257

int ret;

1258

size_t sret;

1259

struct stat st;

1260

1261

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

1262

/* Empty name? */

1263

return 0;

1264

}

1265

1266

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

1267

"abcdefghijklmnopqrstuvwxyz"

1268

"0123456789"

1269

"_-");

1270

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

1271

/* Contains non-allowed characters */

1272

if(debug){

1273

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

1274

direntry->d_name);

1275

}

1276

return 0;

1277

}

1278

1279

char *fullname = NULL;

1280

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

1281

if(ret < 0){

1282

perror_plus("asprintf");

1283

return 0;

1284

}

1285

1286

ret = stat(fullname, &st);

1287

if(ret == -1){

1288

if(debug){

1289

perror_plus("Could not stat hook");

1290

}

1291

return 0;

1292

}

1293

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

1294

/* Not a regular file */

1295

if(debug){

1296

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

1297

direntry->d_name);

1298

}

1299

return 0;

1300

}

1301

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

1302

/* Not executable */

1303

if(debug){

1304

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

1305

direntry->d_name);

1306

}

1307

return 0;

1308

}

1309

if(debug){

1310

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

1311

direntry->d_name);

1312

}

1313

return 1;

1314

}

1315

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1317

int ret;

1318

struct timespec now;

1319

struct timespec waited_time;

1320

intmax_t block_time;

1321

1322

while(true){

1323

if(mc.current_server == NULL){

1324

if (debug){

1325

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

1326

" No timeout!\n");

1327

}

1328

ret = avahi_simple_poll_iterate(s, -1);

1329

} else {

1330

if (debug){

1331

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

1332

" it, or wait\n");

1333

}

1334

/* the current time */

1335

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1336

if(ret == -1){

1337

perror_plus("clock_gettime");

1338

return -1;

1339

}

1340

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

1341

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

1342

waited_time.tv_sec = (now.tv_sec

1343

- mc.current_server->last_seen.tv_sec);

1344

waited_time.tv_nsec = (now.tv_nsec

1345

- mc.current_server->last_seen.tv_nsec);

1346

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

1347

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

1348

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

1349

block_time = ((retry_interval

1350

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

1351

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

1352

1353

if (debug){

1354

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

1355

block_time);

1356

}

1357

1358

if(block_time <= 0){

1359

ret = start_mandos_communication(mc.current_server->ip,

1360

mc.current_server->port,

1361

mc.current_server->if_index,

1362

mc.current_server->af);

1363

if(ret == 0){

1364

avahi_simple_poll_quit(mc.simple_poll);

1365

return 0;

1366

}

1367

ret = clock_gettime(CLOCK_MONOTONIC,

1368

&mc.current_server->last_seen);

1369

if(ret == -1){

1370

perror_plus("clock_gettime");

1371

return -1;

1372

}

1373

mc.current_server = mc.current_server->next;

1374

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

1375

servers, but don't block */

1376

}

1377

1378

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

1379

}

1380

if(ret != 0){

1381

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

1382

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

1383

}

1384

}

1385

}

1386

}

1387

1388

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

1389

const float delay){

1390

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

1395

if(numhooks == -1){

1396

perror_plus("scandir");

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

1404

perror_plus("asprintf");

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

1473

free(delaystring);

1474

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

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

1515

}

1516

895

1517

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

896

1518

AvahiSServiceBrowser *sb = NULL;

897

1519

int error;

899

1521

intmax_t tmpmax;

900

1522

char *tmp;

901

1523

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1524

const char *interface = "";

903

1525

struct ifreq network;

904

int sd;

1526

int sd = -1;

1527

bool take_down_interface = false;

905

1528

uid_t uid;

906

1529

gid_t gid;

907

char *connect_to = NULL;

908

1530

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

909

1531

bool tempdir_created = false;

910

1532

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1536

bool gnutls_initialized = false;

915

1537

bool gpgme_initialized = false;

916

1538

float delay = 2.5f;

1539

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

1540

retrying the same server again */

917

1541

918

struct sigaction old_sigterm_action;

1542

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1543

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1544

1545

uid = getuid();

1546

gid = getgid();

1547

1548

/* Lower any group privileges we might have, just to be safe */

1549

errno = 0;

1550

ret = setgid(gid);

1551

if(ret == -1){

1552

perror_plus("setgid");

1553

}

1554

1555

/* Lower user privileges (temporarily) */

1556

errno = 0;

1557

ret = seteuid(uid);

1558

if(ret == -1){

1559

perror_plus("seteuid");

1560

}

1561

1562

if(quit_now){

1563

goto end;

1564

}

1565

921

1566

{

922

1567

struct argp_option options[] = {

923

1568

{ .name = "debug", .key = 128,

952

1597

.arg = "SECONDS",

953

1598

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

954

1599

.group = 2 },

1600

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

1601

.arg = "SECONDS",

1602

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

1603

.group = 2 },

1604

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

1605

.arg = "DIR",

1606

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

1607

.group = 2 },

1608

/*

1609

* These reproduce what we would get without ARGP_NO_HELP

1610

*/

1611

{ .name = "help", .key = '?',

1612

.doc = "Give this help list", .group = -1 },

1613

{ .name = "usage", .key = -3,

1614

.doc = "Give a short usage message", .group = -1 },

1615

{ .name = "version", .key = 'V',

1616

.doc = "Print program version", .group = -1 },

955

1617

{ .name = NULL }

956

1618

};

957

1619

958

1620

error_t parse_opt(int key, char *arg,

959

1621

struct argp_state *state){

1622

errno = 0;

960

1623

switch(key){

961

1624

case 128: /* --debug */

962

1625

debug = true;

978

1641

tmpmax = strtoimax(arg, &tmp, 10);

979

1642

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

980

1643

or tmpmax != (typeof(mc.dh_bits))tmpmax){

981

fprintf(stderr, "Bad number of DH bits\n");

982

exit(EXIT_FAILURE);

1644

argp_error(state, "Bad number of DH bits");

983

1645

}

984

1646

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

985

1647

break;

990

1652

errno = 0;

991

1653

delay = strtof(arg, &tmp);

992

1654

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

993

fprintf(stderr, "Bad delay\n");

994

exit(EXIT_FAILURE);

995

}

996

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1655

argp_error(state, "Bad delay");

1656

}

1657

case 132: /* --retry */

1658

errno = 0;

1659

retry_interval = strtod(arg, &tmp);

1660

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

1661

or (retry_interval * 1000) > INT_MAX

1662

or retry_interval < 0){

1663

argp_error(state, "Bad retry interval");

1664

}

1665

break;

1666

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

1667

hookdir = arg;

1668

break;

1669

/*

1670

* These reproduce what we would get without ARGP_NO_HELP

1671

*/

1672

case '?': /* --help */

1673

argp_state_help(state, state->out_stream,

1674

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1675

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1676

case -3: /* --usage */

1677

argp_state_help(state, state->out_stream,

1678

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1679

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

1680

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

1681

exit(argp_err_exit_status);

1000

1682

break;

1001

1683

default:

1002

1684

return ARGP_ERR_UNKNOWN;

1003

1685

}

1004

return 0;

1686

return errno;

1005

1687

}

1006

1688

1007

1689

struct argp argp = { .options = options, .parser = parse_opt,

1008

1690

.args_doc = "",

1009

1691

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

1010

1692

" passwords from a Mandos server" };

1011

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

fprintf(stderr, "Unknown error while parsing arguments\n");

1014

exitcode = EXIT_FAILURE;

1015

goto end;

1016

}

1693

ret = argp_parse(&argp, argc, argv,

1694

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1695

switch(ret){

1696

case 0:

1697

break;

1698

case ENOMEM:

1699

default:

1700

errno = ret;

1701

perror_plus("argp_parse");

1702

exitcode = EX_OSERR;

1703

goto end;

1704

case EINVAL:

1705

exitcode = EX_USAGE;

1706

goto end;

1707

}

1708

}

1709

1710

{

1711

/* Work around Debian bug #633582:

1712

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

1713

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

1719

} else {

1720

struct stat st;

1721

1722

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

1723

int seckey_fd = open(seckey, O_RDONLY);

1724

if(seckey_fd == -1){

1725

perror_plus("open");

1726

} else {

1727

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

1728

if(ret == -1){

1729

perror_plus("fstat");

1730

} else {

1731

if(S_ISREG(st.st_mode)

1732

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

1733

ret = fchown(seckey_fd, uid, gid);

1734

if(ret == -1){

1735

perror_plus("fchown");

1736

}

1737

}

1738

}

1739

TEMP_FAILURE_RETRY(close(seckey_fd));

1740

}

1741

}

1742

1743

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

1744

int pubkey_fd = open(pubkey, O_RDONLY);

1745

if(pubkey_fd == -1){

1746

perror_plus("open");

1747

} else {

1748

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

1749

if(ret == -1){

1750

perror_plus("fstat");

1751

} else {

1752

if(S_ISREG(st.st_mode)

1753

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

1754

ret = fchown(pubkey_fd, uid, gid);

1755

if(ret == -1){

1756

perror_plus("fchown");

1757

}

1758

}

1759

}

1760

TEMP_FAILURE_RETRY(close(pubkey_fd));

1761

}

1762

}

1763

1764

/* Lower privileges */

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

1769

}

1770

}

1771

}

1772

1773

/* Run network hooks */

1774

if(not run_network_hooks("start", interface, delay)){

1775

goto end;

1017

1776

}

1018

1777

1019

1778

if(not debug){

1020

1779

avahi_set_log_function(empty_log);

1021

1780

}

1022

1781

1782

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

1783

struct dirent **direntries;

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1793

if(ret >= 1){

1794

/* Pick the first interface returned */

1795

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

1796

if(debug){

1797

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

1798

}

1799

if(interface == NULL){

1800

perror_plus("malloc");

1801

free(direntries);

1802

exitcode = EXIT_FAILURE;

1803

goto end;

1804

}

1805

free(direntries);

1806

} else {

1807

free(direntries);

1808

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

1809

exitcode = EXIT_FAILURE;

1810

goto end;

1811

}

1812

}

1813

1023

1814

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

1024

1815

from the signal handler */

1025

1816

/* Initialize the pseudo-RNG for Avahi */

1026

1817

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

1027

1818

mc.simple_poll = avahi_simple_poll_new();

1028

1819

if(mc.simple_poll == NULL){

1029

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

1030

exitcode = EXIT_FAILURE;

1820

fprintf_plus(stderr,

1821

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

1822

exitcode = EX_UNAVAILABLE;

1031

1823

goto end;

1032

1824

}

1033

1825

1034

1826

sigemptyset(&sigterm_action.sa_mask);

1035

1827

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

1036

1828

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1829

perror_plus("sigaddset");

1830

exitcode = EX_OSERR;

1039

1831

goto end;

1040

1832

}

1041

1833

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

1042

1834

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1835

perror_plus("sigaddset");

1836

exitcode = EX_OSERR;

1045

1837

goto end;

1046

1838

}

1047

1839

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

1048

1840

if(ret == -1){

1049

perror("sigaddset");

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1841

perror_plus("sigaddset");

1842

exitcode = EX_OSERR;

1843

goto end;

1844

}

1845

/* Need to check if the handler is SIG_IGN before handling:

1846

| [[info:libc:Initial Signal Actions]] |

1847

| [[info:libc:Basic Signal Handling]] |

1848

*/

1849

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

1850

if(ret == -1){

1851

perror_plus("sigaction");

1852

return EX_OSERR;

1853

}

1854

if(old_sigterm_action.sa_handler != SIG_IGN){

1855

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

1856

if(ret == -1){

1857

perror_plus("sigaction");

1858

exitcode = EX_OSERR;

1859

goto end;

1860

}

1861

}

1862

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

1863

if(ret == -1){

1864

perror_plus("sigaction");

1865

return EX_OSERR;

1866

}

1867

if(old_sigterm_action.sa_handler != SIG_IGN){

1868

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

1869

if(ret == -1){

1870

perror_plus("sigaction");

1871

exitcode = EX_OSERR;

1872

goto end;

1873

}

1874

}

1875

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

1876

if(ret == -1){

1877

perror_plus("sigaction");

1878

return EX_OSERR;

1879

}

1880

if(old_sigterm_action.sa_handler != SIG_IGN){

1881

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

1882

if(ret == -1){

1883

perror_plus("sigaction");

1884

exitcode = EX_OSERR;

1885

goto end;

1886

}

1887

}

1059

1888

1060

1889

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

1061

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

1890

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

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1892

if(if_index == 0){

1893

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

1894

exitcode = EX_UNAVAILABLE;

1895

goto end;

1896

}

1897

1898

if(quit_now){

1899

goto end;

1900

}

1901

1902

/* Re-raise priviliges */

1903

errno = 0;

1904

ret = seteuid(0);

1905

if(ret == -1){

1906

perror_plus("seteuid");

1907

}

1908

1062

1909

#ifdef __linux__

1063

1910

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1911

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

1065

1912

ret = klogctl(8, NULL, 5);

1066

1913

bool restore_loglevel = true;

1067

1914

if(ret == -1){

1068

1915

restore_loglevel = false;

1069

perror("klogctl");

1916

perror_plus("klogctl");

1070

1917

}

1071

1918

#endif /* __linux__ */

1072

1919

1073

1920

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1921

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1922

perror_plus("socket");

1923

exitcode = EX_OSERR;

1077

1924

#ifdef __linux__

1078

1925

if(restore_loglevel){

1079

1926

ret = klogctl(7, NULL, 0);

1080

1927

if(ret == -1){

1081

perror("klogctl");

1928

perror_plus("klogctl");

1082

1929

}

1083

1930

}

1084

1931

#endif /* __linux__ */

1932

/* Lower privileges */

1933

errno = 0;

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1085

1938

goto end;

1086

1939

}

1087

1940

strcpy(network.ifr_name, interface);

1088

1941

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

1089

1942

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1943

perror_plus("ioctl SIOCGIFFLAGS");

1091

1944

#ifdef __linux__

1092

1945

if(restore_loglevel){

1093

1946

ret = klogctl(7, NULL, 0);

1094

1947

if(ret == -1){

1095

perror("klogctl");

1948

perror_plus("klogctl");

1096

1949

}

1097

1950

}

1098

1951

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1952

exitcode = EX_OSERR;

1953

/* Lower privileges */

1954

errno = 0;

1955

ret = seteuid(uid);

1956

if(ret == -1){

1957

perror_plus("seteuid");

1958

}

1100

1959

goto end;

1101

1960

}

1102

1961

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

1103

1962

network.ifr_flags |= IFF_UP;

1963

take_down_interface = true;

1104

1964

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

1105

1965

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1966

take_down_interface = false;

1967

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1968

exitcode = EX_OSERR;

1108

1969

#ifdef __linux__

1109

1970

if(restore_loglevel){

1110

1971

ret = klogctl(7, NULL, 0);

1111

1972

if(ret == -1){

1112

perror("klogctl");

1973

perror_plus("klogctl");

1113

1974

}

1114

1975

}

1115

1976

#endif /* __linux__ */

1977

/* Lower privileges */

1978

errno = 0;

1979

ret = seteuid(uid);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1116

1983

goto end;

1117

1984

}

1118

1985

}

1119

/* sleep checking until interface is running */

1986

/* Sleep checking until interface is running.

1987

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

1120

1988

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

1121

1989

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

1122

1990

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1991

perror_plus("ioctl SIOCGIFFLAGS");

1124

1992

} else if(network.ifr_flags & IFF_RUNNING){

1125

1993

break;

1126

1994

}

1127

1995

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1996

ret = nanosleep(&sleeptime, NULL);

1129

1997

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

1130

perror("nanosleep");

1998

perror_plus("nanosleep");

1131

1999

}

1132

2000

}

1133

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

1134

if(ret == -1){

1135

perror("close");

2001

if(not take_down_interface){

2002

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

2003

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

2004

if(ret == -1){

2005

perror_plus("close");

2006

}

1136

2007

}

1137

2008

#ifdef __linux__

1138

2009

if(restore_loglevel){

1139

2010

/* Restores kernel loglevel to default */

1140

2011

ret = klogctl(7, NULL, 0);

1141

2012

if(ret == -1){

1142

perror("klogctl");

2013

perror_plus("klogctl");

1143

2014

}

1144

2015

}

1145

2016

#endif /* __linux__ */

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

2017

/* Lower privileges */

2018

errno = 0;

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

2024

}

2025

2026

if(quit_now){

2027

goto end;

1160

2028

}

1161

2029

1162

2030

ret = init_gnutls_global(pubkey, seckey);

1163

2031

if(ret == -1){

1164

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

1165

exitcode = EXIT_FAILURE;

2032

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

2033

exitcode = EX_UNAVAILABLE;

1166

2034

goto end;

1167

2035

} else {

1168

2036

gnutls_initialized = true;

1169

2037

}

1170

2038

2039

if(quit_now){

2040

goto end;

2041

}

2042

1171

2043

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

2044

perror_plus("mkdtemp");

1173

2045

goto end;

1174

2046

}

1175

2047

tempdir_created = true;

1176

2048

2049

if(quit_now){

2050

goto end;

2051

}

2052

1177

2053

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

1178

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

1179

exitcode = EXIT_FAILURE;

2054

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

2055

exitcode = EX_UNAVAILABLE;

1180

2056

goto end;

1181

2057

} else {

1182

2058

gpgme_initialized = true;

1183

2059

}

1184

2060

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

2061

if(quit_now){

2062

goto end;

1192

2063

}

1193

2064

1194

2065

if(connect_to != NULL){

1196

2067

/* (Mainly meant for debugging) */

1197

2068

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

1198

2069

if(address == NULL){

1199

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

2070

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

2071

exitcode = EX_USAGE;

2072

goto end;

2073

}

2074

2075

if(quit_now){

2076

goto end;

2077

}

2078

1203

2079

uint16_t port;

1204

2080

errno = 0;

1205

2081

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

1206

2082

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

1207

2083

or tmpmax != (uint16_t)tmpmax){

1208

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

2084

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

2085

exitcode = EX_USAGE;

2086

goto end;

2087

}

2088

2089

if(quit_now){

2090

goto end;

2091

}

2092

1212

2093

port = (uint16_t)tmpmax;

1213

2094

*address = '\0';

1214

address = connect_to;

1215

2095

/* Colon in address indicates IPv6 */

1216

2096

int af;

1217

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

2097

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

1218

2098

af = AF_INET6;

2099

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

2100

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

2101

{

2102

connect_to++;

2103

address[-1] = '\0';

2104

}

1219

2105

} else {

1220

2106

af = AF_INET;

1221

2107

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

2108

address = connect_to;

2109

2110

if(quit_now){

2111

goto end;

2112

}

2113

2114

while(not quit_now){

2115

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

2116

if(quit_now or ret == 0){

2117

break;

2118

}

2119

if(debug){

2120

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

2121

(int)retry_interval);

2122

}

2123

sleep((int)retry_interval);

2124

}

2125

2126

if (not quit_now){

1226

2127

exitcode = EXIT_SUCCESS;

1227

2128

}

1228

goto end;

1229

}

1230

2129

2130

goto end;

2131

}

2132

2133

if(quit_now){

2134

goto end;

2135

}

2136

1231

2137

{

1232

2138

AvahiServerConfig config;

1233

2139

/* Do not publish any local Zeroconf records */

1248

2154

1249

2155

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

1250

2156

if(mc.server == NULL){

1251

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

1252

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2157

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

2158

avahi_strerror(error));

2159

exitcode = EX_UNAVAILABLE;

2160

goto end;

2161

}

2162

2163

if(quit_now){

1254

2164

goto end;

1255

2165

}

1256

2166

1259

2169

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

2170

NULL, 0, browse_callback, NULL);

1261

2171

if(sb == NULL){

1262

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

1263

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

2174

exitcode = EX_UNAVAILABLE;

2175

goto end;

2176

}

2177

2178

if(quit_now){

1265

2179

goto end;

1266

2180

}

1267

2181

1268

2182

/* Run the main loop */

1269

2183

1270

2184

if(debug){

1271

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

1272

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2185

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

2186

}

2187

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

(int)(retry_interval * 1000));

2190

if(debug){

2191

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

2192

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

2193

}

1275

2194

1276

2195

end:

1277

2196

1278

2197

if(debug){

1279

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

2198

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

1280

2199

}

1281

2200

1282

2201

/* Cleanup things */

1299

2218

gpgme_release(mc.ctx);

1300

2219

}

1301

2220

1302

/* Removes the temp directory used by GPGME */

2221

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

2222

has seen */

2223

if(mc.current_server != NULL){

2224

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

2225

while(mc.current_server != NULL){

2226

server *next = mc.current_server->next;

2227

free(mc.current_server);

2228

mc.current_server = next;

2229

}

2230

}

2231

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

2236

{

2237

errno = 0;

2238

ret = seteuid(0);

2239

if(ret == -1){

2240

perror_plus("seteuid");

2241

}

2242

2243

/* Take down the network interface */

2244

if(take_down_interface and geteuid() == 0){

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

2249

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

2250

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

2251

if(ret == -1){

2252

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2253

}

2254

}

2255

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

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

2259

}

2260

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

2267

2268

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

1303

2269

if(tempdir_created){

1304

DIR *d;

1305

struct dirent *direntry;

1306

d = opendir(tempdir);

1307

if(d == NULL){

1308

if(errno != ENOENT){

1309

perror("opendir");

1310

}

1311

} else {

1312

while(true){

1313

direntry = readdir(d);

1314

if(direntry == NULL){

1315

break;

1316

}

1317

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

1318

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

1319

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

1320

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

1321

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

1322

continue;

1323

}

2270

struct dirent **direntries = NULL;

2271

struct dirent *direntry = NULL;

2272

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

2273

alphasort);

2274

if (numentries > 0){

2275

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

2276

direntry = direntries[i];

1324

2277

char *fullname = NULL;

1325

2278

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

1326

2279

direntry->d_name);

1327

2280

if(ret < 0){

1328

perror("asprintf");

2281

perror_plus("asprintf");

1329

2282

continue;

1330

2283

}

1331

2284

ret = remove(fullname);

1332

2285

if(ret == -1){

1333

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

1334

strerror(errno));

2286

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

2287

strerror(errno));

1335

2288

}

1336

2289

free(fullname);

1337

2290

}

1338

closedir(d);

2291

}

2292

2293

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

2294

free(direntries);

2295

if (numentries == -1){

2296

perror_plus("scandir");

1339

2297

}

1340

2298

ret = rmdir(tempdir);

1341

2299

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

1342

perror("rmdir");

1343

}

2300

perror_plus("rmdir");

2301

}

2302

}

2303

2304

if(quit_now){

2305

sigemptyset(&old_sigterm_action.sa_mask);

2306

old_sigterm_action.sa_handler = SIG_DFL;

2307

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2308

&old_sigterm_action,

2309

NULL));

2310

if(ret == -1){

2311

perror_plus("sigaction");

2312

}

2313

do {

2314

ret = raise(signal_received);

2315

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

2316

if(ret != 0){

2317

perror_plus("raise");

2318

abort();

2319

}

2320

TEMP_FAILURE_RETRY(pause());

1344

2321

}

1345

2322

1346

2323

return exitcode;