/mandos/release : revision 24.1.135

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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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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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

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

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stdout, ferror(), remove() */

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stdout, ferror(), sscanf(),

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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, srand(),

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strtof(), abort() */

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

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srand() */

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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(), 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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#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 <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */

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

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

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program_invocation_short_name */

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

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

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

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

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setgid() */

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

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#ifdef __linux__

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

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#endif /* __linux__ */

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#endif

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/* Avahi */

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/* All Avahi types, constants and functions

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98

init_gnutls_session(),

112

99

GNUTLS_* */

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100

#include <gnutls/openpgp.h>

114

/* 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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113

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

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114

#define SECKEY "seckey.txt"

128

115

#define PUBKEY "pubkey.txt"

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

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131

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bool debug = false;

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118

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

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121

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

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123

typedef struct {

156

128

gnutls_dh_params_t dh_params;

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129

const char *priority;

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130

gpgme_ctx_t ctx;

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server *current_server;

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131

} mandos_context;

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132

162

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

163

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

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135

.dh_bits = 1024, .priority = "SECURE256"

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

166

.current_server = NULL };

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168

sig_atomic_t quit_now = 0;

169

int signal_received = 0;

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171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

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program_invocation_short_name);

175

perror(print_text);

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}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

136

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

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187

138

/*

188

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

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

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* "buffer_length" is how much is already used.

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

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* additional bytes. "buffer_capacity" is how much is currently

141

* allocated, "buffer_length" is how much is already used.

191

142

*/

192

143

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){

194

145

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

146

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

196

147

if(buffer == NULL){

201

152

return buffer_capacity;

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153

}

203

154

204

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

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

206

int af){

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int ret;

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

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if(new_server == NULL){

210

perror_plus("malloc");

211

return -1;

212

}

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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){

218

perror_plus("strdup");

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return -1;

220

}

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/* Special case of first server */

222

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 */

227

} else {

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new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

239

}

240

241

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/*

242

156

* Initialize GPGME.

243

157

*/

244

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

245

const char *tempdir){

158

static bool init_gpgme(const char *seckey,

159

const char *pubkey, const char *tempdir){

160

int ret;

246

161

gpgme_error_t rc;

247

162

gpgme_engine_info_t engine_info;

248

163

251

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

252

167

*/

253

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bool import_key(const char *filename){

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int ret;

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int fd;

256

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gpgme_data_t pgp_data;

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

259

173

if(fd == -1){

260

perror_plus("open");

174

perror("open");

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return false;

262

176

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

179

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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182

return false;

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}

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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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190

}

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

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193

if(ret == -1){

280

perror_plus("close");

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perror("close");

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}

282

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gpgme_data_release(pgp_data);

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return true;

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198

}

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if(debug){

287

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

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fprintf(stderr, "Initialize gpgme\n");

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202

}

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/* Init GPGME */

291

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gpgme_check_version(NULL);

292

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

207

if(rc != GPG_ERR_NO_ERROR){

294

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

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gpgme_strsource(rc), gpgme_strerror(rc));

208

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

209

gpgme_strsource(rc), gpgme_strerror(rc));

296

210

return false;

297

211

}

298

212

299

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

213

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

300

214

rc = gpgme_get_engine_info(&engine_info);

301

215

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

216

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

217

gpgme_strsource(rc), gpgme_strerror(rc));

304

218

return false;

305

219

}

306

220

while(engine_info != NULL){

312

226

engine_info = engine_info->next;

313

227

}

314

228

if(engine_info == NULL){

315

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

316

tempdir);

229

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

317

230

return false;

318

231

}

319

232

320

233

/* Create new GPGME "context" */

321

234

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

322

235

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

236

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

237

gpgme_strsource(rc), gpgme_strerror(rc));

326

238

return false;

327

239

}

328

240

330

242

return false;

331

243

}

332

244

333

return true;

245

return true;

334

246

}

335

247

336

248

/*

347

259

ssize_t plaintext_length = 0;

348

260

349

261

if(debug){

350

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

262

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

351

263

}

352

264

353

265

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

354

266

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

267

0);

356

268

if(rc != GPG_ERR_NO_ERROR){

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

359

271

return -1;

360

272

}

361

273

362

274

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

363

275

rc = gpgme_data_new(&dh_plain);

364

276

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

277

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

278

gpgme_strsource(rc), gpgme_strerror(rc));

368

279

gpgme_data_release(dh_crypto);

369

280

return -1;

370

281

}

373

284

data buffer */

374

285

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

375

286

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

287

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

288

gpgme_strsource(rc), gpgme_strerror(rc));

378

289

plaintext_length = -1;

379

290

if(debug){

380

291

gpgme_decrypt_result_t result;

381

292

result = gpgme_op_decrypt_result(mc.ctx);

382

293

if(result == NULL){

383

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

294

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

384

295

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

296

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

297

result->unsupported_algorithm);

298

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

299

result->wrong_key_usage);

389

300

if(result->file_name != NULL){

390

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

301

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

391

302

}

392

303

gpgme_recipient_t recipient;

393

304

recipient = result->recipients;

394

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

402

recipient = recipient->next;

305

if(recipient){

306

while(recipient != NULL){

307

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

308

gpgme_pubkey_algo_name(recipient->pubkey_algo));

309

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

310

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

311

recipient->status == GPG_ERR_NO_SECKEY

312

? "No" : "Yes");

313

recipient = recipient->next;

314

}

403

315

}

404

316

}

405

317

}

407

319

}

408

320

409

321

if(debug){

410

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

322

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

411

323

}

412

324

413

325

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

414

326

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

415

perror_plus("gpgme_data_seek");

327

perror("gpgme_data_seek");

416

328

plaintext_length = -1;

417

329

goto decrypt_end;

418

330

}

420

332

*plaintext = NULL;

421

333

while(true){

422

334

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

335

(size_t)plaintext_length,

336

plaintext_capacity);

425

337

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

338

perror("incbuffer");

339

plaintext_length = -1;

340

goto decrypt_end;

429

341

}

430

342

431

343

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

348

break;

437

349

}

438

350

if(ret < 0){

439

perror_plus("gpgme_data_read");

351

perror("gpgme_data_read");

440

352

plaintext_length = -1;

441

353

goto decrypt_end;

442

354

}

444

356

}

445

357

446

358

if(debug){

447

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

359

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

448

360

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

449

361

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

450

362

}

472

384

/* GnuTLS log function callback */

473

385

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

474

386

const char* string){

475

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

387

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

476

388

}

477

389

478

390

static int init_gnutls_global(const char *pubkeyfilename,

480

392

int ret;

481

393

482

394

if(debug){

483

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

395

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

484

396

}

485

397

486

398

ret = gnutls_global_init();

487

399

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

400

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

401

safer_gnutls_strerror(ret));

490

402

return -1;

491

403

}

492

404

499

411

}

500

412

501

413

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

414

gnutls_certificate_allocate_credentials(&mc.cred);

503

415

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

416

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

417

from

418

-Wunreachable-code

419

*/

420

safer_gnutls_strerror(ret));

506

421

gnutls_global_deinit();

507

422

return -1;

508

423

}

509

424

510

425

if(debug){

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

426

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

427

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

428

seckeyfilename);

515

429

}

516

430

517

431

ret = gnutls_certificate_set_openpgp_key_file

518

432

(mc.cred, pubkeyfilename, seckeyfilename,

519

433

GNUTLS_OPENPGP_FMT_BASE64);

520

434

if(ret != GNUTLS_E_SUCCESS){

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

435

fprintf(stderr,

436

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

437

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

438

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

439

safer_gnutls_strerror(ret));

526

440

goto globalfail;

527

441

}

528

442

529

443

/* GnuTLS server initialization */

530

444

ret = gnutls_dh_params_init(&mc.dh_params);

531

445

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

446

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

447

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

535

448

goto globalfail;

536

449

}

537

450

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

538

451

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

452

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

453

safer_gnutls_strerror(ret));

541

454

goto globalfail;

542

455

}

543

456

556

469

static int init_gnutls_session(gnutls_session_t *session){

557

470

int ret;

558

471

/* GnuTLS session creation */

559

do {

560

ret = gnutls_init(session, GNUTLS_SERVER);

561

if(quit_now){

562

return -1;

563

}

564

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

472

ret = gnutls_init(session, GNUTLS_SERVER);

565

473

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

474

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

475

safer_gnutls_strerror(ret));

569

476

}

570

477

571

478

{

572

479

const char *err;

573

do {

574

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

575

if(quit_now){

576

gnutls_deinit(*session);

577

return -1;

578

}

579

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

480

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

580

481

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

safer_gnutls_strerror(ret));

482

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

483

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

484

safer_gnutls_strerror(ret));

584

485

gnutls_deinit(*session);

585

486

return -1;

586

487

}

587

488

}

588

489

589

do {

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

592

if(quit_now){

593

gnutls_deinit(*session);

594

return -1;

595

}

596

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

490

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

491

mc.cred);

597

492

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

600

495

gnutls_deinit(*session);

601

496

return -1;

602

497

}

603

498

604

499

/* ignore client certificate if any. */

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

500

gnutls_certificate_server_set_request(*session,

501

GNUTLS_CERT_IGNORE);

606

502

607

503

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

608

504

617

513

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

618

514

AvahiIfIndex if_index,

619

515

int af){

620

int ret, tcp_sd = -1;

516

int ret, tcp_sd;

621

517

ssize_t sret;

622

518

union {

623

519

struct sockaddr_in in;

624

520

struct sockaddr_in6 in6;

625

521

} to;

626

522

char *buffer = NULL;

627

char *decrypted_buffer = NULL;

523

char *decrypted_buffer;

628

524

size_t buffer_length = 0;

629

525

size_t buffer_capacity = 0;

526

ssize_t decrypted_buffer_size;

630

527

size_t written;

631

int retval = -1;

528

int retval = 0;

632

529

gnutls_session_t session;

633

530

int pf; /* Protocol family */

634

531

635

errno = 0;

636

637

if(quit_now){

638

errno = EINTR;

639

return -1;

640

}

641

642

532

switch(af){

643

533

case AF_INET6:

644

534

pf = PF_INET6;

647

537

pf = PF_INET;

648

538

break;

649

539

default:

650

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

651

errno = EINVAL;

540

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

652

541

return -1;

653

542

}

654

543

658

547

}

659

548

660

549

if(debug){

661

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

662

PRIu16 "\n", ip, port);

550

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

551

"\n", ip, port);

663

552

}

664

553

665

554

tcp_sd = socket(pf, SOCK_STREAM, 0);

666

555

if(tcp_sd < 0){

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

670

goto mandos_end;

671

}

672

673

if(quit_now){

674

errno = EINTR;

675

goto mandos_end;

556

perror("socket");

557

return -1;

676

558

}

677

559

678

560

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

679

561

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

562

to.in6.sin6_family = (uint16_t)af;

681

563

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

682

564

} else { /* IPv4 */

683

565

to.in.sin_family = (sa_family_t)af;

684

566

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

685

567

}

686

568

if(ret < 0 ){

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

690

goto mandos_end;

569

perror("inet_pton");

570

return -1;

691

571

}

692

572

if(ret == 0){

693

int e = errno;

694

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

695

errno = e;

696

goto mandos_end;

573

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

574

return -1;

697

575

}

698

576

if(af == AF_INET6){

699

577

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

702

580

703

581

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

582

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

705

-Wunreachable-code*/

583

-Wunreachable-code*/

706

584

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

710

goto mandos_end;

585

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

586

" without a network interface\n");

587

return -1;

711

588

}

712

589

/* Set the network interface number as scope */

713

590

to.in6.sin6_scope_id = (uint32_t)if_index;

718

595

-Wunreachable-code */

719

596

}

720

597

721

if(quit_now){

722

errno = EINTR;

723

goto mandos_end;

724

}

725

726

598

if(debug){

727

599

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

728

600

char interface[IF_NAMESIZE];

729

601

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

730

perror_plus("if_indextoname");

602

perror("if_indextoname");

731

603

} else {

732

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

733

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

604

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

605

ip, interface, port);

734

606

}

735

607

} else {

736

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

737

ip, port);

608

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

609

port);

738

610

}

739

611

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

612

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

747

619

sizeof(addrstr));

748

620

}

749

621

if(pcret == NULL){

750

perror_plus("inet_ntop");

622

perror("inet_ntop");

751

623

} else {

752

624

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

753

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

625

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

754

626

}

755

627

}

756

628

}

757

629

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

763

630

if(af == AF_INET6){

764

631

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

765

632

} else {

766

633

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

767

634

}

768

635

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

774

goto mandos_end;

775

}

776

777

if(quit_now){

778

errno = EINTR;

779

goto mandos_end;

636

perror("connect");

637

return -1;

780

638

}

781

639

782

640

const char *out = mandos_protocol_version;

784

642

while(true){

785

643

size_t out_size = strlen(out);

786

644

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

787

out_size - written));

645

out_size - written));

788

646

if(ret == -1){

789

int e = errno;

790

perror_plus("write");

791

errno = e;

647

perror("write");

648

retval = -1;

792

649

goto mandos_end;

793

650

}

794

651

written += (size_t)ret;

802

659

break;

803

660

}

804

661

}

805

806

if(quit_now){

807

errno = EINTR;

808

goto mandos_end;

809

}

810

662

}

811

663

812

664

if(debug){

813

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

814

}

815

816

if(quit_now){

817

errno = EINTR;

818

goto mandos_end;

819

}

820

821

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

665

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

666

}

667

822

668

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

669

824

if(quit_now){

825

errno = EINTR;

826

goto mandos_end;

827

}

828

829

do {

670

do{

830

671

ret = gnutls_handshake(session);

831

if(quit_now){

832

errno = EINTR;

833

goto mandos_end;

834

}

835

672

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

836

673

837

674

if(ret != GNUTLS_E_SUCCESS){

838

675

if(debug){

839

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

676

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

840

677

gnutls_perror(ret);

841

678

}

842

errno = EPROTO;

679

retval = -1;

843

680

goto mandos_end;

844

681

}

845

682

846

683

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

847

684

848

685

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

686

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

687

ip);

851

688

}

852

689

853

690

while(true){

854

855

if(quit_now){

856

errno = EINTR;

857

goto mandos_end;

858

}

859

860

691

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

692

buffer_capacity);

862

693

if(buffer_capacity == 0){

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

866

goto mandos_end;

867

}

868

869

if(quit_now){

870

errno = EINTR;

694

perror("incbuffer");

695

retval = -1;

871

696

goto mandos_end;

872

697

}

873

698

882

707

case GNUTLS_E_AGAIN:

883

708

break;

884

709

case GNUTLS_E_REHANDSHAKE:

885

do {

710

do{

886

711

ret = gnutls_handshake(session);

887

888

if(quit_now){

889

errno = EINTR;

890

goto mandos_end;

891

}

892

712

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

893

713

if(ret < 0){

894

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

895

"***\n");

714

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

896

715

gnutls_perror(ret);

897

errno = EPROTO;

716

retval = -1;

898

717

goto mandos_end;

899

718

}

900

719

break;

901

720

default:

902

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

903

" encrypted session with Mandos server\n");

721

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

722

" encrypted session with Mandos server\n");

723

retval = -1;

904

724

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

906

725

goto mandos_end;

907

726

}

908

727

} else {

911

730

}

912

731

913

732

if(debug){

914

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

915

}

916

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

do {

923

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

924

if(quit_now){

925

errno = EINTR;

926

goto mandos_end;

927

}

928

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

733

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

734

}

735

736

gnutls_bye(session, GNUTLS_SHUT_RDWR);

929

737

930

738

if(buffer_length > 0){

931

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

739

decrypted_buffer_size = pgp_packet_decrypt(buffer,

740

buffer_length,

933

741

&decrypted_buffer);

934

742

if(decrypted_buffer_size >= 0){

935

936

743

written = 0;

937

744

while(written < (size_t) decrypted_buffer_size){

938

if(quit_now){

939

errno = EINTR;

940

goto mandos_end;

941

}

942

943

745

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

944

746

(size_t)decrypted_buffer_size - written,

945

747

stdout);

946

748

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

947

int e = errno;

948

749

if(debug){

949

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

950

strerror(errno));

750

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

751

strerror(errno));

951

752

}

952

errno = e;

953

goto mandos_end;

753

retval = -1;

754

break;

954

755

}

955

756

written += (size_t)ret;

956

757

}

957

retval = 0;

758

free(decrypted_buffer);

759

} else {

760

retval = -1;

958

761

}

762

} else {

763

retval = -1;

959

764

}

960

765

961

766

/* Shutdown procedure */

962

767

963

768

mandos_end:

964

{

965

int e = errno;

966

free(decrypted_buffer);

967

free(buffer);

968

if(tcp_sd >= 0){

969

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

970

}

971

if(ret == -1){

972

if(e == 0){

973

e = errno;

974

}

975

perror_plus("close");

976

}

977

gnutls_deinit(session);

978

errno = e;

979

if(quit_now){

980

errno = EINTR;

981

retval = -1;

982

}

769

free(buffer);

770

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

771

if(ret == -1){

772

perror("close");

983

773

}

774

gnutls_deinit(session);

984

775

return retval;

985

776

}

986

777

997

788

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

789

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

790

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

791

__attribute__((unused)) void* userdata){

1001

792

assert(r);

1002

793

1003

794

/* Called whenever a service has been resolved successfully or

1004

795

timed out */

1005

796

1006

if(quit_now){

1007

return;

1008

}

1009

1010

797

switch(event){

1011

798

default:

1012

799

case AVAHI_RESOLVER_FAILURE:

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

800

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

801

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

802

avahi_strerror(avahi_server_errno(mc.server)));

1017

803

break;

1018

804

1019

805

case AVAHI_RESOLVER_FOUND:

1021

807

char ip[AVAHI_ADDRESS_STR_MAX];

1022

808

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

1023

809

if(debug){

1024

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

1025

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

1026

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

810

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

811

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

812

ip, (intmax_t)interface, port);

1027

813

}

1028

814

int ret = start_mandos_communication(ip, port, interface,

1029

815

avahi_proto_to_af(proto));

1030

816

if(ret == 0){

1031

817

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1035

818

}

1036

819

}

1037

820

}

1047

830

const char *domain,

1048

831

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

832

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

833

__attribute__((unused)) void* userdata){

1051

834

assert(b);

1052

835

1053

836

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

1054

837

is removed from the LAN */

1055

838

1056

if(quit_now){

1057

return;

1058

}

1059

1060

839

switch(event){

1061

840

default:

1062

841

case AVAHI_BROWSER_FAILURE:

1063

842

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

843

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

844

avahi_strerror(avahi_server_errno(mc.server)));

1066

845

avahi_simple_poll_quit(mc.simple_poll);

1067

846

return;

1068

847

1072

851

the callback function is called the Avahi server will free the

1073

852

resolver for us. */

1074

853

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

854

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

855

protocol, name, type, domain,

856

AVAHI_PROTO_INET6, 0,

857

resolve_callback, NULL)))

858

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

859

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

1081

860

break;

1082

861

1083

862

case AVAHI_BROWSER_REMOVE:

1086

865

case AVAHI_BROWSER_ALL_FOR_NOW:

1087

866

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1088

867

if(debug){

1089

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

1090

" searching...\n");

868

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

1091

869

}

1092

870

break;

1093

871

}

1094

872

}

1095

873

1096

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

1097

static void handle_sigterm(int sig){

1098

if(quit_now){

1099

return;

1100

}

1101

quit_now = 1;

1102

signal_received = sig;

874

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

875

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

1103

876

int old_errno = errno;

1104

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1107

}

877

avahi_simple_poll_quit(mc.simple_poll);

1108

878

errno = old_errno;

1109

879

}

1110

880

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1122

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1124

}

1125

return false;

1126

}

1127

return true;

1128

}

1129

1130

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

1131

1132

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

if(debug){

1135

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

1136

ifname);

1137

}

1138

return false;

1139

}

1140

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

1141

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

1142

if(debug){

1143

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

1144

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

1145

}

1146

return true;

1147

}

1148

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

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1165

/* Accept this device */

1166

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

1511

881

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

1512

882

AvahiSServiceBrowser *sb = NULL;

1513

883

int error;

1514

884

int ret;

1515

885

intmax_t tmpmax;

1516

char *tmp;

886

int numchars;

1517

887

int exitcode = EXIT_SUCCESS;

1518

const char *interface = "";

888

const char *interface = "eth0";

1519

889

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

890

int sd;

1522

891

uid_t uid;

1523

892

gid_t gid;

893

char *connect_to = NULL;

1524

894

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

1525

895

bool tempdir_created = false;

1526

896

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1529

899

1530

900

bool gnutls_initialized = false;

1531

901

bool gpgme_initialized = false;

1532

float delay = 2.5f;

1533

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

1534

retrying the same server again */

1535

1536

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

902

double delay = 2.5;

903

904

struct sigaction old_sigterm_action;

1537

905

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1538

1539

uid = getuid();

1540

gid = getgid();

1541

1542

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

1543

errno = 0;

1544

ret = setgid(gid);

1545

if(ret == -1){

1546

perror_plus("setgid");

1547

}

1548

1549

/* Lower user privileges (temporarily) */

1550

errno = 0;

1551

ret = seteuid(uid);

1552

if(ret == -1){

1553

perror_plus("seteuid");

1554

}

1555

1556

if(quit_now){

1557

goto end;

1558

}

1559

906

1560

907

{

1561

908

struct argp_option options[] = {

1562

909

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

1591

938

.arg = "SECONDS",

1592

939

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

1593

940

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

/*

1603

* These reproduce what we would get without ARGP_NO_HELP

1604

*/

1605

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

1606

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

1607

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

1608

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

1609

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

1610

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

1611

941

{ .name = NULL }

1612

942

};

1613

943

1614

944

error_t parse_opt(int key, char *arg,

1615

945

struct argp_state *state){

1616

errno = 0;

1617

946

switch(key){

1618

947

case 128: /* --debug */

1619

948

debug = true;

1631

960

pubkey = arg;

1632

961

break;

1633

962

case 129: /* --dh-bits */

1634

errno = 0;

1635

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

1636

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

1637

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

1638

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

963

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

964

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

965

or arg[numchars] != '\0'){

966

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

967

exit(EXIT_FAILURE);

1639

968

}

1640

969

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

1641

970

break;

1643

972

mc.priority = arg;

1644

973

break;

1645

974

case 131: /* --delay */

1646

errno = 0;

1647

delay = strtof(arg, &tmp);

1648

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

1649

argp_error(state, "Bad delay");

1650

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1663

/*

1664

* These reproduce what we would get without ARGP_NO_HELP

1665

*/

1666

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

1667

argp_state_help(state, state->out_stream,

1668

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1669

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1670

case -3: /* --usage */

1671

argp_state_help(state, state->out_stream,

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1677

exit(argp_err_exit_status);

975

ret = sscanf(arg, "%lf%n", &delay, &numchars);

976

if(ret < 1 or arg[numchars] != '\0'){

977

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

978

exit(EXIT_FAILURE);

979

}

980

break;

981

case ARGP_KEY_ARG:

982

argp_usage(state);

983

case ARGP_KEY_END:

1678

984

break;

1679

985

default:

1680

986

return ARGP_ERR_UNKNOWN;

1681

987

}

1682

return errno;

988

return 0;

1683

989

}

1684

990

1685

991

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

1686

992

.args_doc = "",

1687

993

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

1688

994

" passwords from a Mandos server" };

1689

ret = argp_parse(&argp, argc, argv,

1690

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1691

switch(ret){

1692

case 0:

1693

break;

1694

case ENOMEM:

1695

default:

1696

errno = ret;

1697

perror_plus("argp_parse");

1698

exitcode = EX_OSERR;

1699

goto end;

1700

case EINVAL:

1701

exitcode = EX_USAGE;

1702

goto end;

1703

}

1704

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1772

}

1773

995

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

996

if(ret == ARGP_ERR_UNKNOWN){

997

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

998

exitcode = EXIT_FAILURE;

999

goto end;

1000

}

1001

}

1002

1774

1003

if(not debug){

1775

1004

avahi_set_log_function(empty_log);

1776

1005

}

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1006

1810

1007

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

1811

1008

from the signal handler */

1812

1009

/* Initialize the pseudo-RNG for Avahi */

1813

1010

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

1814

1011

mc.simple_poll = avahi_simple_poll_new();

1815

1012

if(mc.simple_poll == NULL){

1816

fprintf_plus(stderr,

1817

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

1818

exitcode = EX_UNAVAILABLE;

1013

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

1014

exitcode = EXIT_FAILURE;

1819

1015

goto end;

1820

1016

}

1821

1017

1822

1018

sigemptyset(&sigterm_action.sa_mask);

1823

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

1824

if(ret == -1){

1825

perror_plus("sigaddset");

1826

exitcode = EX_OSERR;

1827

goto end;

1828

}

1829

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

1830

if(ret == -1){

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1833

goto end;

1834

}

1835

1019

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

1836

1020

if(ret == -1){

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1839

goto end;

1840

}

1841

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

1842

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

1843

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

1844

*/

1845

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

1846

if(ret == -1){

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1849

}

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

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

1852

if(ret == -1){

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1855

goto end;

1856

}

1857

}

1858

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

1859

if(ret == -1){

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1862

}

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

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

1865

if(ret == -1){

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1868

goto end;

1869

}

1870

}

1871

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

1872

if(ret == -1){

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1875

}

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1877

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

1878

if(ret == -1){

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1881

goto end;

1882

}

1883

}

1021

perror("sigaddset");

1022

exitcode = EXIT_FAILURE;

1023

goto end;

1024

}

1025

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

1026

if(ret == -1){

1027

perror("sigaction");

1028

exitcode = EXIT_FAILURE;

1029

goto end;

1030

}

1031

1884

1032

1885

1033

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1034

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

1905

1035

#ifdef __linux__

1906

1036

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1037

messages to mess up the prompt */

1908

1038

ret = klogctl(8, NULL, 5);

1909

1039

bool restore_loglevel = true;

1910

1040

if(ret == -1){

1911

1041

restore_loglevel = false;

1912

perror_plus("klogctl");

1042

perror("klogctl");

1913

1043

}

1914

#endif /* __linux__ */

1044

#endif

1915

1045

1916

1046

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

1047

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1048

perror("socket");

1049

exitcode = EXIT_FAILURE;

1920

1050

#ifdef __linux__

1921

1051

if(restore_loglevel){

1922

1052

ret = klogctl(7, NULL, 0);

1923

1053

if(ret == -1){

1924

perror_plus("klogctl");

1054

perror("klogctl");

1925

1055

}

1926

1056

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1057

#endif

1934

1058

goto end;

1935

1059

}

1936

1060

strcpy(network.ifr_name, interface);

1937

1061

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

1938

1062

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1063

perror("ioctl SIOCGIFFLAGS");

1940

1064

#ifdef __linux__

1941

1065

if(restore_loglevel){

1942

1066

ret = klogctl(7, NULL, 0);

1943

1067

if(ret == -1){

1944

perror_plus("klogctl");

1068

perror("klogctl");

1945

1069

}

1946

1070

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1071

#endif

1072

exitcode = EXIT_FAILURE;

1955

1073

goto end;

1956

1074

}

1957

1075

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

1958

1076

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

1077

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

1961

1078

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1079

perror("ioctl SIOCSIFFLAGS");

1080

exitcode = EXIT_FAILURE;

1965

1081

#ifdef __linux__

1966

1082

if(restore_loglevel){

1967

1083

ret = klogctl(7, NULL, 0);

1968

1084

if(ret == -1){

1969

perror_plus("klogctl");

1085

perror("klogctl");

1970

1086

}

1971

1087

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1088

#endif

1979

1089

goto end;

1980

1090

}

1981

1091

}

1982

/* Sleep checking until interface is running.

1983

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

1092

/* sleep checking until interface is running */

1984

1093

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

1985

1094

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

1986

1095

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1096

perror("ioctl SIOCGIFFLAGS");

1988

1097

} else if(network.ifr_flags & IFF_RUNNING){

1989

1098

break;

1990

1099

}

1991

1100

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

1101

ret = nanosleep(&sleeptime, NULL);

1993

1102

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

1994

perror_plus("nanosleep");

1103

perror("nanosleep");

1995

1104

}

1996

1105

}

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

1106

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

1107

if(ret == -1){

1108

perror("close");

2003

1109

}

2004

1110

#ifdef __linux__

2005

1111

if(restore_loglevel){

2006

1112

/* Restores kernel loglevel to default */

2007

1113

ret = klogctl(7, NULL, 0);

2008

1114

if(ret == -1){

2009

perror_plus("klogctl");

1115

perror("klogctl");

2010

1116

}

2011

1117

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2020

}

2021

2022

if(quit_now){

2023

goto end;

1118

#endif

1119

}

1120

1121

uid = getuid();

1122

gid = getgid();

1123

1124

errno = 0;

1125

setgid(gid);

1126

if(ret == -1){

1127

perror("setgid");

1128

}

1129

1130

ret = setuid(uid);

1131

if(ret == -1){

1132

perror("setuid");

2024

1133

}

2025

1134

2026

1135

ret = init_gnutls_global(pubkey, seckey);

2027

1136

if(ret == -1){

2028

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

2029

exitcode = EX_UNAVAILABLE;

1137

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

1138

exitcode = EXIT_FAILURE;

2030

1139

goto end;

2031

1140

} else {

2032

1141

gnutls_initialized = true;

2033

1142

}

2034

1143

2035

if(quit_now){

2036

goto end;

2037

}

2038

2039

1144

if(mkdtemp(tempdir) == NULL){

2040

perror_plus("mkdtemp");

1145

perror("mkdtemp");

2041

1146

goto end;

2042

1147

}

2043

1148

tempdir_created = true;

2044

1149

2045

if(quit_now){

2046

goto end;

2047

}

2048

2049

1150

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

2050

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

2051

exitcode = EX_UNAVAILABLE;

1151

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

1152

exitcode = EXIT_FAILURE;

2052

1153

goto end;

2053

1154

} else {

2054

1155

gpgme_initialized = true;

2055

1156

}

2056

1157

2057

if(quit_now){

2058

goto end;

1158

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

1159

if_index = (AvahiIfIndex) if_nametoindex(interface);

1160

if(if_index == 0){

1161

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

1162

exitcode = EXIT_FAILURE;

1163

goto end;

1164

}

2059

1165

}

2060

1166

2061

1167

if(connect_to != NULL){

2063

1169

/* (Mainly meant for debugging) */

2064

1170

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

2065

1171

if(address == NULL){

2066

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

2067

exitcode = EX_USAGE;

2068

goto end;

2069

}

2070

2071

if(quit_now){

2072

goto end;

2073

}

2074

1172

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

1173

exitcode = EXIT_FAILURE;

1174

goto end;

1175

}

2075

1176

uint16_t port;

2076

errno = 0;

2077

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

2078

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

2079

or tmpmax != (uint16_t)tmpmax){

2080

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

2081

exitcode = EX_USAGE;

2082

goto end;

2083

}

2084

2085

if(quit_now){

2086

goto end;

2087

}

2088

1177

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1178

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1179

or address[numchars+1] != '\0'){

1180

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

1181

exitcode = EXIT_FAILURE;

1182

goto end;

1183

}

2089

1184

port = (uint16_t)tmpmax;

2090

1185

*address = '\0';

1186

address = connect_to;

2091

1187

/* Colon in address indicates IPv6 */

2092

1188

int af;

2093

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

1189

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

2094

1190

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

2101

1191

} else {

2102

1192

af = AF_INET;

2103

1193

}

2104

address = connect_to;

2105

2106

if(quit_now){

2107

goto end;

2108

}

2109

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1194

ret = start_mandos_communication(address, port, if_index,

1195

af);

1196

if(ret < 0){

1197

exitcode = EXIT_FAILURE;

1198

} else {

2123

1199

exitcode = EXIT_SUCCESS;

2124

1200

}

1201

goto end;

1202

}

2125

1203

2126

goto end;

2127

}

2128

2129

if(quit_now){

2130

goto end;

2131

}

2132

2133

1204

{

2134

1205

AvahiServerConfig config;

2135

1206

/* Do not publish any local Zeroconf records */

2150

1221

2151

1222

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

2152

1223

if(mc.server == NULL){

2153

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

2154

avahi_strerror(error));

2155

exitcode = EX_UNAVAILABLE;

2156

goto end;

2157

}

2158

2159

if(quit_now){

1224

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

1225

avahi_strerror(error));

1226

exitcode = EXIT_FAILURE;

2160

1227

goto end;

2161

1228

}

2162

1229

2163

1230

/* Create the Avahi service browser */

2164

1231

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1232

AVAHI_PROTO_INET6, "_mandos._tcp",

2166

1233

NULL, 0, browse_callback, NULL);

2167

1234

if(sb == NULL){

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

2170

exitcode = EX_UNAVAILABLE;

2171

goto end;

2172

}

2173

2174

if(quit_now){

1235

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

1236

avahi_strerror(avahi_server_errno(mc.server)));

1237

exitcode = EXIT_FAILURE;

2175

1238

goto end;

2176

1239

}

2177

1240

2178

1241

/* Run the main loop */

2179

1242

2180

1243

if(debug){

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1244

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

1245

}

1246

1247

avahi_simple_poll_loop(mc.simple_poll);

2190

1248

2191

1249

end:

2192

1250

2193

1251

if(debug){

2194

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

1252

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

2195

1253

}

2196

1254

2197

1255

/* Cleanup things */

2214

1272

gpgme_release(mc.ctx);

2215

1273

}

2216

1274

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2255

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

2264

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

1275

/* Removes the temp directory used by GPGME */

2265

1276

if(tempdir_created){

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1277

DIR *d;

1278

struct dirent *direntry;

1279

d = opendir(tempdir);

1280

if(d == NULL){

1281

if(errno != ENOENT){

1282

perror("opendir");

1283

}

1284

} else {

1285

while(true){

1286

direntry = readdir(d);

1287

if(direntry == NULL){

1288

break;

1289

}

1290

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

1291

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

1292

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

1293

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

1294

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

1295

continue;

1296

}

2273

1297

char *fullname = NULL;

2274

1298

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

2275

1299

direntry->d_name);

2276

1300

if(ret < 0){

2277

perror_plus("asprintf");

1301

perror("asprintf");

2278

1302

continue;

2279

1303

}

2280

1304

ret = remove(fullname);

2281

1305

if(ret == -1){

2282

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

2283

strerror(errno));

1306

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

1307

strerror(errno));

2284

1308

}

2285

1309

free(fullname);

2286

1310

}

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1311

closedir(d);

2293

1312

}

2294

1313

ret = rmdir(tempdir);

2295

1314

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

2296

perror_plus("rmdir");

2297

}

2298

}

2299

2300

if(quit_now){

2301

sigemptyset(&old_sigterm_action.sa_mask);

2302

old_sigterm_action.sa_handler = SIG_DFL;

2303

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2304

&old_sigterm_action,

2305

NULL));

2306

if(ret == -1){

2307

perror_plus("sigaction");

2308

}

2309

do {

2310

ret = raise(signal_received);

2311

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

2312

if(ret != 0){

2313

perror_plus("raise");

2314

abort();

2315

}

2316

TEMP_FAILURE_RETRY(pause());

1315

perror("rmdir");

1316

}

2317

1317

}

2318

1318

2319

1319

return exitcode;