/mandos/release : revision 24.1.173

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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 /* not _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 /* not _FILE_OFFSET_BITS */

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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() */

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

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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, srand(),

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strtof(), abort() */

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

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

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asprintf(), strncpy(), strsignal()

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*/

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

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

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#include <sys/ioctl.h> /* ioctl */

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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*/

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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

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#include <iso646.h> /* not, or, and */

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#include <argp.h> /* struct argp_option, error_t, struct

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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89

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

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107

init_gnutls_session(),

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108

GNUTLS_* */

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109

#include <gnutls/openpgp.h>

126

/* 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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122

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

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123

#define SECKEY "seckey.txt"

140

124

#define PUBKEY "pubkey.txt"

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

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bool debug = false;

144

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static const char mandos_protocol_version[] = "1";

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

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

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

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130

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

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131

char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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134

typedef struct {

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AvahiSimplePoll *simple_poll;

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136

AvahiServer *server;

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137

gnutls_certificate_credentials_t cred;

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138

unsigned int dh_bits;

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139

gnutls_dh_params_t dh_params;

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140

const char *priority;

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141

gpgme_ctx_t ctx;

173

server *current_server;

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char *interfaces;

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size_t interfaces_size;

176

142

} mandos_context;

177

143

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/* global so signal handler can reach it*/

179

AvahiSimplePoll *simple_poll;

144

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

145

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

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.dh_bits = 1024, .priority = "SECURE256"

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

180

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181

149

sig_atomic_t quit_now = 0;

182

150

int signal_received = 0;

183

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184

/* Function to use when printing errors */

185

void perror_plus(const char *print_text){

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int e = errno;

187

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

188

program_invocation_short_name);

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errno = e;

190

perror(print_text);

191

}

192

193

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

194

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

195

va_list ap;

196

va_start (ap, format);

197

198

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

199

program_invocation_short_name));

200

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

201

}

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203

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/*

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153

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

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154

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

206

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* "buffer_length" is how much is already used.

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156

*/

208

__attribute__((nonnull, warn_unused_result))

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157

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

213

if(new_buf == NULL){

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int old_errno = errno;

215

free(*buffer);

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errno = old_errno;

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*buffer = NULL;

160

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

161

if(buffer == NULL){

218

162

return 0;

219

163

}

220

*buffer = new_buf;

221

164

buffer_capacity += BUFFER_SIZE;

222

165

}

223

166

return buffer_capacity;

224

167

}

225

168

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

227

__attribute__((nonnull, warn_unused_result))

228

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

229

int af, server **current_server){

230

int ret;

231

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

232

if(new_server == NULL){

233

perror_plus("malloc");

234

return false;

235

}

236

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

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.port = port,

238

.if_index = if_index,

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.af = af };

240

if(new_server->ip == NULL){

241

perror_plus("strdup");

242

free(new_server);

243

return false;

244

}

245

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

246

if(ret == -1){

247

perror_plus("clock_gettime");

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

253

#ifdef __GNUC__

254

#pragma GCC diagnostic pop

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#endif

256

free(new_server);

257

return false;

258

}

259

/* Special case of first server */

260

if(*current_server == NULL){

261

new_server->next = new_server;

262

new_server->prev = new_server;

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*current_server = new_server;

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} else {

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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274

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/*

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170

* Initialize GPGME.

276

171

*/

277

__attribute__((nonnull, warn_unused_result))

278

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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177

285

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/*

286

179

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

287

180

*/

288

bool import_key(const char * const filename){

181

bool import_key(const char *filename){

289

182

int ret;

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183

int fd;

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184

gpgme_data_t pgp_data;

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185

293

186

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

294

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if(fd == -1){

295

perror_plus("open");

188

perror("open");

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return false;

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190

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

300

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if(rc != GPG_ERR_NO_ERROR){

301

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

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gpgme_strsource(rc), gpgme_strerror(rc));

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

196

return false;

304

197

}

305

198

306

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

199

rc = gpgme_op_import(mc.ctx, pgp_data);

307

200

if(rc != GPG_ERR_NO_ERROR){

308

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

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gpgme_strsource(rc), gpgme_strerror(rc));

201

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

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gpgme_strsource(rc), gpgme_strerror(rc));

310

203

return false;

311

204

}

312

205

313

ret = close(fd);

206

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

314

207

if(ret == -1){

315

perror_plus("close");

208

perror("close");

316

209

}

317

210

gpgme_data_release(pgp_data);

318

211

return true;

319

212

}

320

213

321

214

if(debug){

322

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

215

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

323

216

}

324

217

325

218

/* Init GPGME */

326

219

gpgme_check_version(NULL);

327

220

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

328

221

if(rc != GPG_ERR_NO_ERROR){

329

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

330

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

331

224

return false;

332

225

}

333

226

334

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

227

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

335

228

rc = gpgme_get_engine_info(&engine_info);

336

229

if(rc != GPG_ERR_NO_ERROR){

337

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

338

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

339

232

return false;

340

233

}

341

234

while(engine_info != NULL){

347

240

engine_info = engine_info->next;

348

241

}

349

242

if(engine_info == NULL){

350

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

351

tempdir);

243

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

352

244

return false;

353

245

}

354

246

355

247

/* Create new GPGME "context" */

356

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

248

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

357

249

if(rc != GPG_ERR_NO_ERROR){

358

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

359

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

360

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

361

252

return false;

362

253

}

363

254

372

263

* Decrypt OpenPGP data.

373

264

* Returns -1 on error

374

265

*/

375

__attribute__((nonnull, warn_unused_result))

376

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

377

267

size_t crypto_size,

378

char **plaintext,

379

mandos_context *mc){

268

char **plaintext){

380

269

gpgme_data_t dh_crypto, dh_plain;

381

270

gpgme_error_t rc;

382

271

ssize_t ret;

384

273

ssize_t plaintext_length = 0;

385

274

386

275

if(debug){

387

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

276

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

388

277

}

389

278

390

279

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

391

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

392

281

0);

393

282

if(rc != GPG_ERR_NO_ERROR){

394

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

395

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

396

285

return -1;

397

286

}

398

287

399

288

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

400

289

rc = gpgme_data_new(&dh_plain);

401

290

if(rc != GPG_ERR_NO_ERROR){

402

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

403

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

404

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

405

293

gpgme_data_release(dh_crypto);

406

294

return -1;

407

295

}

408

296

409

297

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

410

298

data buffer */

411

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

299

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

412

300

if(rc != GPG_ERR_NO_ERROR){

413

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

414

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

415

303

plaintext_length = -1;

416

304

if(debug){

417

305

gpgme_decrypt_result_t result;

418

result = gpgme_op_decrypt_result(mc->ctx);

306

result = gpgme_op_decrypt_result(mc.ctx);

419

307

if(result == NULL){

420

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

308

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

421

309

} else {

422

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

423

result->unsupported_algorithm);

424

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

425

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

426

314

if(result->file_name != NULL){

427

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

315

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

428

316

}

429

317

gpgme_recipient_t recipient;

430

318

recipient = result->recipients;

431

319

while(recipient != NULL){

432

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

433

gpgme_pubkey_algo_name

434

(recipient->pubkey_algo));

435

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

436

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

437

recipient->status == GPG_ERR_NO_SECKEY

438

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

439

326

recipient = recipient->next;

440

327

}

441

328

}

444

331

}

445

332

446

333

if(debug){

447

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

334

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

448

335

}

449

336

450

337

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

451

338

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

452

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

453

340

plaintext_length = -1;

454

341

goto decrypt_end;

455

342

}

457

344

*plaintext = NULL;

458

345

while(true){

459

346

plaintext_capacity = incbuffer(plaintext,

460

(size_t)plaintext_length,

461

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

462

349

if(plaintext_capacity == 0){

463

perror_plus("incbuffer");

464

plaintext_length = -1;

465

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

466

353

}

467

354

468

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

473

360

break;

474

361

}

475

362

if(ret < 0){

476

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

477

364

plaintext_length = -1;

478

365

goto decrypt_end;

479

366

}

481

368

}

482

369

483

370

if(debug){

484

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

371

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

485

372

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

486

373

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

487

374

}

498

385

return plaintext_length;

499

386

}

500

387

501

__attribute__((warn_unused_result, const))

502

static const char *safe_string(const char *str){

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

__attribute__((warn_unused_result))

509

static const char *safer_gnutls_strerror(int value){

510

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

388

static const char * safer_gnutls_strerror(int value){

389

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

390

-Wunreachable-code */

391

if(ret == NULL)

392

ret = "(unknown)";

393

return ret;

512

394

}

513

395

514

396

/* GnuTLS log function callback */

515

__attribute__((nonnull))

516

397

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

517

398

const char* string){

518

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

399

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

519

400

}

520

401

521

__attribute__((nonnull(1, 2, 4), warn_unused_result))

522

402

static int init_gnutls_global(const char *pubkeyfilename,

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

mandos_context *mc){

403

const char *seckeyfilename){

526

404

int ret;

527

unsigned int uret;

528

405

529

406

if(debug){

530

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

407

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

408

}

409

410

ret = gnutls_global_init();

411

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

414

return -1;

531

415

}

532

416

533

417

if(debug){

539

423

}

540

424

541

425

/* OpenPGP credentials */

542

ret = gnutls_certificate_allocate_credentials(&mc->cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

543

427

if(ret != GNUTLS_E_SUCCESS){

544

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

545

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

433

gnutls_global_deinit();

546

434

return -1;

547

435

}

548

436

549

437

if(debug){

550

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

551

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

552

pubkeyfilename,

553

seckeyfilename);

438

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

439

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

440

seckeyfilename);

554

441

}

555

442

556

443

ret = gnutls_certificate_set_openpgp_key_file

557

(mc->cred, pubkeyfilename, seckeyfilename,

444

(mc.cred, pubkeyfilename, seckeyfilename,

558

445

GNUTLS_OPENPGP_FMT_BASE64);

559

446

if(ret != GNUTLS_E_SUCCESS){

560

fprintf_plus(stderr,

561

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

562

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

563

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

564

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

565

452

goto globalfail;

566

453

}

567

454

568

455

/* GnuTLS server initialization */

569

ret = gnutls_dh_params_init(&mc->dh_params);

570

if(ret != GNUTLS_E_SUCCESS){

571

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

572

" initialization: %s\n",

573

safer_gnutls_strerror(ret));

574

goto globalfail;

575

}

576

/* If a Diffie-Hellman parameters file was given, try to use it */

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

params_capacity = incbuffer((char **)&params.data,

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

fprintf_plus(stderr, "Failed to parse DH parameters in file"

625

" \"%s\": %s\n", dhparamsfilename,

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

" bits): %s\n", mc->dh_bits,

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

749

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

456

ret = gnutls_dh_params_init(&mc.dh_params);

457

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

460

goto globalfail;

461

}

462

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

463

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

466

goto globalfail;

467

}

468

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

750

470

751

471

return 0;

752

472

753

473

globalfail:

754

474

755

gnutls_certificate_free_credentials(mc->cred);

756

gnutls_dh_params_deinit(mc->dh_params);

475

gnutls_certificate_free_credentials(mc.cred);

476

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

757

478

return -1;

758

479

}

759

480

760

__attribute__((nonnull, warn_unused_result))

761

static int init_gnutls_session(gnutls_session_t *session,

762

mandos_context *mc){

481

static int init_gnutls_session(gnutls_session_t *session){

763

482

int ret;

764

483

/* GnuTLS session creation */

765

484

do {

769

488

}

770

489

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

771

490

if(ret != GNUTLS_E_SUCCESS){

772

fprintf_plus(stderr,

773

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

774

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

775

493

}

776

494

777

495

{

778

496

const char *err;

779

497

do {

780

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

498

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

781

499

if(quit_now){

782

500

gnutls_deinit(*session);

783

501

return -1;

784

502

}

785

503

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

786

504

if(ret != GNUTLS_E_SUCCESS){

787

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

788

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

789

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

790

508

gnutls_deinit(*session);

791

509

return -1;

792

510

}

794

512

795

513

do {

796

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

797

mc->cred);

515

mc.cred);

798

516

if(quit_now){

799

517

gnutls_deinit(*session);

800

518

return -1;

801

519

}

802

520

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

803

521

if(ret != GNUTLS_E_SUCCESS){

804

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

805

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

806

524

gnutls_deinit(*session);

807

525

return -1;

808

526

}

810

528

/* ignore client certificate if any. */

811

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

812

530

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

813

533

return 0;

814

534

}

815

535

817

537

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

818

538

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

819

539

820

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

821

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

825

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

826

ret = errno;

827

}

828

errno = old_errno;

829

return ret;

830

}

831

832

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

833

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

838

errno = old_errno;

839

return ret;

840

}

841

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

842

ret = errno;

843

}

844

errno = old_errno;

845

return ret;

846

}

847

848

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

849

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

853

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

854

ret = errno;

855

}

856

errno = old_errno;

857

return ret;

858

}

859

860

/* Lower privileges permanently */

861

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

865

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

866

ret = errno;

867

}

868

errno = old_errno;

869

return ret;

870

}

871

872

/* Helper function to add_local_route() and delete_local_route() */

873

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

875

const char *address,

876

AvahiIfIndex if_index){

877

int ret;

878

char helper[] = "mandos-client-iprouteadddel";

879

char add_arg[] = "add";

880

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

if(pluginhelperdir == NULL){

884

if(debug){

885

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

886

" variable not set; cannot run helper\n");

887

}

888

return false;

889

}

890

891

char interface[IF_NAMESIZE];

892

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

893

perror_plus("if_indextoname");

894

return false;

895

}

896

897

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

898

if(devnull == -1){

899

perror_plus("open(\"/dev/null\", O_RDONLY)");

900

return false;

901

}

902

pid_t pid = fork();

903

if(pid == 0){

904

/* Child */

905

/* Raise privileges */

906

errno = raise_privileges_permanently();

907

if(errno != 0){

908

perror_plus("Failed to raise privileges");

909

/* _exit(EX_NOPERM); */

910

} else {

911

/* Set group */

912

errno = 0;

913

ret = setgid(0);

914

if(ret == -1){

915

perror_plus("setgid");

916

_exit(EX_NOPERM);

917

}

918

/* Reset supplementary groups */

919

errno = 0;

920

ret = setgroups(0, NULL);

921

if(ret == -1){

922

perror_plus("setgroups");

923

_exit(EX_NOPERM);

924

}

925

}

926

ret = dup2(devnull, STDIN_FILENO);

927

if(ret == -1){

928

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

929

_exit(EX_OSERR);

930

}

931

ret = close(devnull);

932

if(ret == -1){

933

perror_plus("close");

934

_exit(EX_OSERR);

935

}

936

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

937

if(ret == -1){

938

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

939

_exit(EX_OSERR);

940

}

941

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

942

O_RDONLY

943

| O_DIRECTORY

944

| O_PATH

945

| O_CLOEXEC));

946

if(helperdir_fd == -1){

947

perror_plus("open");

948

_exit(EX_UNAVAILABLE);

949

}

950

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

951

helper, O_RDONLY));

952

if(helper_fd == -1){

953

perror_plus("openat");

954

close(helperdir_fd);

955

_exit(EX_UNAVAILABLE);

956

}

957

close(helperdir_fd);

958

#ifdef __GNUC__

959

#pragma GCC diagnostic push

960

#pragma GCC diagnostic ignored "-Wcast-qual"

961

#endif

962

if(fexecve(helper_fd, (char *const [])

963

{ helper, add ? add_arg : delete_arg, (char *)address,

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

966

#ifdef __GNUC__

967

#pragma GCC diagnostic pop

968

#endif

969

perror_plus("fexecve");

970

_exit(EXIT_FAILURE);

971

}

972

}

973

if(pid == -1){

974

perror_plus("fork");

975

return false;

976

}

977

int status;

978

pid_t pret = -1;

979

errno = 0;

980

do {

981

pret = waitpid(pid, &status, 0);

982

if(pret == -1 and errno == EINTR and quit_now){

983

int errno_raising = 0;

984

if((errno = raise_privileges()) != 0){

985

errno_raising = errno;

986

perror_plus("Failed to raise privileges in order to"

987

" kill helper program");

988

}

989

if(kill(pid, SIGTERM) == -1){

990

perror_plus("kill");

991

}

992

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

993

perror_plus("Failed to lower privileges after killing"

994

" helper program");

995

}

996

return false;

997

}

998

} while(pret == -1 and errno == EINTR);

999

if(pret == -1){

1000

perror_plus("waitpid");

1001

return false;

1002

}

1003

if(WIFEXITED(status)){

1004

if(WEXITSTATUS(status) != 0){

1005

fprintf_plus(stderr, "Error: iprouteadddel exited"

1006

" with status %d\n", WEXITSTATUS(status));

1007

return false;

1008

}

1009

return true;

1010

}

1011

if(WIFSIGNALED(status)){

1012

fprintf_plus(stderr, "Error: iprouteadddel died by"

1013

" signal %d\n", WTERMSIG(status));

1014

return false;

1015

}

1016

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1017

return false;

1018

}

1019

1020

__attribute__((nonnull, warn_unused_result))

1021

static bool add_local_route(const char *address,

1022

AvahiIfIndex if_index){

1023

if(debug){

1024

fprintf_plus(stderr, "Adding route to %s\n", address);

1025

}

1026

return add_delete_local_route(true, address, if_index);

1027

}

1028

1029

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

1031

AvahiIfIndex if_index){

1032

if(debug){

1033

fprintf_plus(stderr, "Removing route to %s\n", address);

1034

}

1035

return add_delete_local_route(false, address, if_index);

1036

}

1037

1038

540

/* Called when a Mandos server is found */

1039

__attribute__((nonnull, warn_unused_result))

1040

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

541

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

1041

542

AvahiIfIndex if_index,

1042

int af, mandos_context *mc){

543

int af){

1043

544

int ret, tcp_sd = -1;

1044

545

ssize_t sret;

1045

struct sockaddr_storage to;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

1046

550

char *buffer = NULL;

1047

551

char *decrypted_buffer = NULL;

1048

552

size_t buffer_length = 0;

1051

555

int retval = -1;

1052

556

gnutls_session_t session;

1053

557

int pf; /* Protocol family */

1054

bool route_added = false;

1055

558

1056

559

errno = 0;

1057

560

1068

571

pf = PF_INET;

1069

572

break;

1070

573

default:

1071

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

574

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

1072

575

errno = EINVAL;

1073

576

return -1;

1074

577

}

1075

578

1076

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

1077

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

1078

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

1079

bool match = false;

1080

{

1081

char *interface = NULL;

1082

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

1083

interface))){

1084

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

1085

match = true;

1086

break;

1087

}

1088

}

1089

}

1090

if(not match){

1091

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

1092

connect to the server */

1093

if(debug){

1094

char interface[IF_NAMESIZE];

1095

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

1096

perror_plus("if_indextoname");

1097

} else {

1098

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

1099

" \"%s\"\n",

1100

if_indextoname((unsigned int)if_index,

1101

interface));

1102

}

1103

}

1104

return -1;

1105

}

1106

}

1107

1108

ret = init_gnutls_session(&session, mc);

579

ret = init_gnutls_session(&session);

1109

580

if(ret != 0){

1110

581

return -1;

1111

582

}

1112

583

1113

584

if(debug){

1114

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

1115

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

585

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

586

"\n", ip, port);

1116

587

}

1117

588

1118

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

1119

590

if(tcp_sd < 0){

1120

591

int e = errno;

1121

perror_plus("socket");

592

perror("socket");

1122

593

errno = e;

1123

594

goto mandos_end;

1124

595

}

1128

599

goto mandos_end;

1129

600

}

1130

601

602

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

1131

603

if(af == AF_INET6){

1132

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1133

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1134

ret = inet_pton(af, ip, &to6->sin6_addr);

604

to.in6.sin6_family = (sa_family_t)af;

605

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

1135

606

} else { /* IPv4 */

1136

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1137

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1138

ret = inet_pton(af, ip, &to4->sin_addr);

607

to.in.sin_family = (sa_family_t)af;

608

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

1139

609

}

1140

610

if(ret < 0 ){

1141

611

int e = errno;

1142

perror_plus("inet_pton");

612

perror("inet_pton");

1143

613

errno = e;

1144

614

goto mandos_end;

1145

615

}

1146

616

if(ret == 0){

1147

617

int e = errno;

1148

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

618

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

1149

619

errno = e;

1150

620

goto mandos_end;

1151

621

}

1152

622

if(af == AF_INET6){

1153

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

1154

if(IN6_IS_ADDR_LINKLOCAL

1155

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

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

1156

630

if(if_index == AVAHI_IF_UNSPEC){

1157

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

1158

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

1159

633

errno = EINVAL;

1160

634

goto mandos_end;

1161

635

}

1162

636

/* Set the network interface number as scope */

1163

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

637

to.in6.sin6_scope_id = (uint32_t)if_index;

1164

638

}

1165

639

} else {

1166

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

640

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

641

-Wconversion and

642

-Wunreachable-code */

1167

643

}

1168

644

1169

645

if(quit_now){

1175

651

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

1176

652

char interface[IF_NAMESIZE];

1177

653

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

1178

perror_plus("if_indextoname");

654

perror("if_indextoname");

1179

655

} else {

1180

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

1181

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

656

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

657

ip, interface, port);

1182

658

}

1183

659

} else {

1184

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

1185

ip, (uintmax_t)port);

660

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

661

port);

1186

662

}

1187

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1188

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1189

if(af == AF_INET6){

1190

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

1191

sizeof(struct sockaddr_in6),

1192

addrstr, sizeof(addrstr), NULL, 0,

1193

NI_NUMERICHOST);

1194

} else {

1195

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

1196

sizeof(struct sockaddr_in),

1197

addrstr, sizeof(addrstr), NULL, 0,

1198

NI_NUMERICHOST);

1199

}

1200

if(ret == EAI_SYSTEM){

1201

perror_plus("getnameinfo");

1202

} else if(ret != 0) {

1203

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

1204

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

1205

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

1206

}

1207

}

1208

1209

if(quit_now){

1210

errno = EINTR;

1211

goto mandos_end;

1212

}

1213

1214

while(true){

1215

if(af == AF_INET6){

1216

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

1217

sizeof(struct sockaddr_in6));

1218

} else {

1219

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

1220

sizeof(struct sockaddr_in));

1221

}

1222

if(ret < 0){

1223

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1224

and if_index != AVAHI_IF_UNSPEC

1225

and connect_to == NULL

1226

and not route_added and

1227

((af == AF_INET6 and not

1228

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1229

&to)->sin6_addr)))

1230

or (af == AF_INET and

1231

/* Not a a IPv4LL address */

1232

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1233

& 0xFFFF0000L) != 0xA9FE0000L))){

1234

/* Work around Avahi bug - Avahi does not announce link-local

1235

addresses if it has a global address, so local hosts with

1236

*only* a link-local address (e.g. Mandos clients) cannot

1237

connect to a Mandos server announced by Avahi on a server

1238

host with a global address. Work around this by retrying

1239

with an explicit route added with the server's address.

1240

1241

Avahi bug reference:

1242

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1243

https://bugs.debian.org/587961

1244

*/

1245

if(debug){

1246

fprintf_plus(stderr, "Mandos server unreachable, trying"

1247

" direct route\n");

1248

}

1249

int e = errno;

1250

route_added = add_local_route(ip, if_index);

1251

if(route_added){

1252

continue;

1253

}

1254

errno = e;

1255

}

1256

if(errno != ECONNREFUSED or debug){

1257

int e = errno;

1258

perror_plus("connect");

1259

errno = e;

1260

}

1261

goto mandos_end;

1262

}

1263

1264

if(quit_now){

1265

errno = EINTR;

1266

goto mandos_end;

1267

}

1268

break;

665

const char *pcret;

666

if(af == AF_INET6){

667

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

668

sizeof(addrstr));

669

} else {

670

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

671

sizeof(addrstr));

672

}

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

679

}

680

}

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

if(af == AF_INET6){

688

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

689

} else {

690

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

691

}

692

if(ret < 0){

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

1269

704

}

1270

705

1271

706

const char *out = mandos_protocol_version;

1273

708

while(true){

1274

709

size_t out_size = strlen(out);

1275

710

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

1276

out_size - written));

711

out_size - written));

1277

712

if(ret == -1){

1278

713

int e = errno;

1279

perror_plus("write");

714

perror("write");

1280

715

errno = e;

1281

716

goto mandos_end;

1282

717

}

1299

734

}

1300

735

1301

736

if(debug){

1302

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

737

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

1303

738

}

1304

739

1305

740

if(quit_now){

1306

741

errno = EINTR;

1307

742

goto mandos_end;

1308

743

}

1309

1310

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

1311

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

1312

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

1313

gnutls_transport_set_ptr(session,

1314

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

744

745

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

746

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1315

747

1316

748

if(quit_now){

1317

749

errno = EINTR;

1328

760

1329

761

if(ret != GNUTLS_E_SUCCESS){

1330

762

if(debug){

1331

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

763

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

1332

764

gnutls_perror(ret);

1333

765

}

1334

766

errno = EPROTO;

1338

770

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

1339

771

1340

772

if(debug){

1341

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1342

" %s\n", ip);

773

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

774

ip);

1343

775

}

1344

776

1345

777

while(true){

1350

782

}

1351

783

1352

784

buffer_capacity = incbuffer(&buffer, buffer_length,

1353

buffer_capacity);

785

buffer_capacity);

1354

786

if(buffer_capacity == 0){

1355

787

int e = errno;

1356

perror_plus("incbuffer");

788

perror("incbuffer");

1357

789

errno = e;

1358

790

goto mandos_end;

1359

791

}

1383

815

}

1384

816

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

1385

817

if(ret < 0){

1386

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

1387

"***\n");

818

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

1388

819

gnutls_perror(ret);

1389

820

errno = EPROTO;

1390

821

goto mandos_end;

1391

822

}

1392

823

break;

1393

824

default:

1394

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

1395

" encrypted session with Mandos server\n");

825

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

826

" encrypted session with Mandos server\n");

1396

827

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1397

828

errno = EIO;

1398

829

goto mandos_end;

1403

834

}

1404

835

1405

836

if(debug){

1406

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

837

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

1407

838

}

1408

839

1409

840

if(quit_now){

1421

852

1422

853

if(buffer_length > 0){

1423

854

ssize_t decrypted_buffer_size;

1424

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1425

&decrypted_buffer, mc);

855

decrypted_buffer_size = pgp_packet_decrypt(buffer,

856

buffer_length,

857

&decrypted_buffer);

1426

858

if(decrypted_buffer_size >= 0){

1427

859

1428

clearerr(stdout);

1429

860

written = 0;

1430

861

while(written < (size_t) decrypted_buffer_size){

1431

862

if(quit_now){

1439

870

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

1440

871

int e = errno;

1441

872

if(debug){

1442

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

1443

strerror(errno));

873

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

874

strerror(errno));

1444

875

}

1445

876

errno = e;

1446

877

goto mandos_end;

1447

878

}

1448

879

written += (size_t)ret;

1449

880

}

1450

ret = fflush(stdout);

1451

if(ret != 0){

1452

int e = errno;

1453

if(debug){

1454

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

1455

strerror(errno));

1456

}

1457

errno = e;

1458

goto mandos_end;

1459

}

1460

881

retval = 0;

1461

882

}

1462

883

}

1465

886

1466

887

mandos_end:

1467

888

{

1468

if(route_added){

1469

if(not delete_local_route(ip, if_index)){

1470

fprintf_plus(stderr, "Failed to delete local route to %s on"

1471

" interface %d", ip, if_index);

1472

}

1473

}

1474

889

int e = errno;

1475

890

free(decrypted_buffer);

1476

891

free(buffer);

1477

892

if(tcp_sd >= 0){

1478

ret = close(tcp_sd);

893

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

1479

894

}

1480

895

if(ret == -1){

1481

896

if(e == 0){

1482

897

e = errno;

1483

898

}

1484

perror_plus("close");

899

perror("close");

1485

900

}

1486

901

gnutls_deinit(session);

1487

errno = e;

1488

902

if(quit_now){

1489

errno = EINTR;

903

e = EINTR;

1490

904

retval = -1;

1491

905

}

906

errno = e;

1492

907

}

1493

908

return retval;

1494

909

}

1495

910

1496

__attribute__((nonnull))

1497

911

static void resolve_callback(AvahiSServiceResolver *r,

1498

912

AvahiIfIndex interface,

1499

913

AvahiProtocol proto,

1507

921

AVAHI_GCC_UNUSED AvahiStringList *txt,

1508

922

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1509

923

flags,

1510

void *mc){

1511

if(r == NULL){

1512

return;

1513

}

924

AVAHI_GCC_UNUSED void* userdata){

925

assert(r);

1514

926

1515

927

/* Called whenever a service has been resolved successfully or

1516

928

timed out */

1517

929

1518

930

if(quit_now){

1519

avahi_s_service_resolver_free(r);

1520

931

return;

1521

932

}

1522

933

1523

934

switch(event){

1524

935

default:

1525

936

case AVAHI_RESOLVER_FAILURE:

1526

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

1527

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

1528

domain,

1529

avahi_strerror(avahi_server_errno

1530

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

937

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

938

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

939

avahi_strerror(avahi_server_errno(mc.server)));

1531

940

break;

1532

941

1533

942

case AVAHI_RESOLVER_FOUND:

1535

944

char ip[AVAHI_ADDRESS_STR_MAX];

1536

945

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

1537

946

if(debug){

1538

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

1539

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

1540

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

947

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

948

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

949

ip, (intmax_t)interface, port);

1541

950

}

1542

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

1543

interface,

1544

avahi_proto_to_af(proto),

1545

mc);

951

int ret = start_mandos_communication(ip, port, interface,

952

avahi_proto_to_af(proto));

1546

953

if(ret == 0){

1547

avahi_simple_poll_quit(simple_poll);

1548

} else {

1549

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

1550

avahi_proto_to_af(proto),

1551

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

1552

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

1553

" list\n", name);

1554

}

954

avahi_simple_poll_quit(mc.simple_poll);

1555

955

}

1556

956

}

1557

957

}

1567

967

const char *domain,

1568

968

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1569

969

flags,

1570

void *mc){

1571

if(b == NULL){

1572

return;

1573

}

970

AVAHI_GCC_UNUSED void* userdata){

971

assert(b);

1574

972

1575

973

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

1576

974

is removed from the LAN */

1583

981

default:

1584

982

case AVAHI_BROWSER_FAILURE:

1585

983

1586

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

1587

avahi_strerror(avahi_server_errno

1588

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

1589

avahi_simple_poll_quit(simple_poll);

984

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

985

avahi_strerror(avahi_server_errno(mc.server)));

986

avahi_simple_poll_quit(mc.simple_poll);

1590

987

return;

1591

988

1592

989

case AVAHI_BROWSER_NEW:

1595

992

the callback function is called the Avahi server will free the

1596

993

resolver for us. */

1597

994

1598

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

1599

interface, protocol, name, type,

1600

domain, protocol, 0,

1601

resolve_callback, mc) == NULL)

1602

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

1603

" %s\n", name,

1604

avahi_strerror(avahi_server_errno

1605

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

995

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

996

name, type, domain, protocol, 0,

997

resolve_callback, NULL) == NULL)

998

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

999

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

1606

1000

break;

1607

1001

1608

1002

case AVAHI_BROWSER_REMOVE:

1611

1005

case AVAHI_BROWSER_ALL_FOR_NOW:

1612

1006

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1613

1007

if(debug){

1614

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

1615

" searching...\n");

1008

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

1616

1009

}

1617

1010

break;

1618

1011

}

1619

1012

}

1620

1013

1621

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

1014

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

1622

1015

static void handle_sigterm(int sig){

1623

1016

if(quit_now){

1624

1017

return;

1626

1019

quit_now = 1;

1627

1020

signal_received = sig;

1628

1021

int old_errno = errno;

1629

/* set main loop to exit */

1630

if(simple_poll != NULL){

1631

avahi_simple_poll_quit(simple_poll);

1022

if(mc.simple_poll != NULL){

1023

avahi_simple_poll_quit(mc.simple_poll);

1632

1024

}

1633

1025

errno = old_errno;

1634

1026

}

1635

1027

1636

__attribute__((nonnull, warn_unused_result))

1637

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

1638

int ret;

1639

int old_errno;

1640

1641

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

1642

if(s < 0){

1643

old_errno = errno;

1644

perror_plus("socket");

1645

errno = old_errno;

1646

return false;

1647

}

1648

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1649

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1650

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1651

if(ret == -1){

1028

/*

1029

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

1030

* corresponds to an acceptable network device.

1031

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

1032

*/

1033

int good_interface(const struct dirent *if_entry){

1034

ssize_t ssret;

1035

char *flagname = NULL;

1036

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

1037

return 0;

1038

}

1039

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

1040

if_entry->d_name);

1041

if(ret < 0){

1042

perror("asprintf");

1043

return 0;

1044

}

1045

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

1046

if(flags_fd == -1){

1047

perror("open");

1048

free(flagname);

1049

return 0;

1050

}

1051

free(flagname);

1052

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

1053

/* read line from flags_fd */

1054

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

1055

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

1056

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

1057

if(flagstring == NULL){

1058

perror("malloc");

1059

close(flags_fd);

1060

return 0;

1061

}

1062

while(to_read > 0){

1063

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

1064

(size_t)to_read));

1065

if(ssret == -1){

1066

perror("read");

1067

free(flagstring);

1068

close(flags_fd);

1069

return 0;

1070

}

1071

to_read -= ssret;

1072

if(ssret == 0){

1073

break;

1074

}

1075

}

1076

close(flags_fd);

1077

intmax_t tmpmax;

1078

char *tmp;

1079

errno = 0;

1080

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

1081

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

1082

and not (isspace(*tmp)))

1083

or tmpmax != (ifreq_flags)tmpmax){

1652

1084

if(debug){

1653

old_errno = errno;

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

errno = old_errno;

1085

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

1086

flagstring, if_entry->d_name);

1656

1087

}

1657

return false;

1088

free(flagstring);

1089

return 0;

1658

1090

}

1659

return true;

1660

}

1661

1662

__attribute__((nonnull, warn_unused_result))

1663

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

1664

1091

free(flagstring);

1092

ifreq_flags flags = (ifreq_flags)tmpmax;

1665

1093

/* Reject the loopback device */

1666

if(ifr->ifr_flags & IFF_LOOPBACK){

1094

if(flags & IFF_LOOPBACK){

1667

1095

if(debug){

1668

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

1669

ifname);

1096

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

1097

if_entry->d_name);

1670

1098

}

1671

return false;

1099

return 0;

1672

1100

}

1673

1101

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

1674

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

1102

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

1675

1103

if(debug){

1676

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

1677

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

1104

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

1105

if_entry->d_name);

1678

1106

}

1679

return true;

1107

return 1;

1680

1108

}

1681

1109

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

1682

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

1110

if(not (flags & IFF_BROADCAST)){

1683

1111

if(debug){

1684

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1685

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

1112

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

1113

if_entry->d_name);

1686

1114

}

1687

return false;

1115

return 0;

1688

1116

}

1689

1117

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

1690

if(ifr->ifr_flags & IFF_NOARP){

1118

if(flags & IFF_NOARP){

1691

1119

if(debug){

1692

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

1693

ifname);

1120

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

1121

if_entry->d_name);

1694

1122

}

1695

return false;

1123

return 0;

1696

1124

}

1697

1698

1125

/* Accept this device */

1699

1126

if(debug){

1700

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

1701

}

1702

return true;

1703

}

1704

1705

/*

1706

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

1707

* corresponds to an acceptable network device.

1708

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

1709

*/

1710

__attribute__((nonnull, warn_unused_result))

1711

int good_interface(const struct dirent *if_entry){

1712

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

1713

return 0;

1714

}

1715

1716

struct ifreq ifr;

1717

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

1718

if(debug){

1719

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

1720

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

1721

}

1722

return 0;

1723

}

1724

1725

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

1726

return 0;

1127

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

1128

if_entry->d_name);

1727

1129

}

1728

1130

return 1;

1729

1131

}

1730

1132

1731

/*

1732

* This function determines if a network interface is up.

1733

*/

1734

__attribute__((nonnull, warn_unused_result))

1735

bool interface_is_up(const char *interface){

1736

struct ifreq ifr;

1737

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

1738

if(debug){

1739

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

1740

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

1741

}

1742

return false;

1743

}

1744

1745

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

1746

}

1747

1748

/*

1749

* This function determines if a network interface is running

1750

*/

1751

__attribute__((nonnull, warn_unused_result))

1752

bool interface_is_running(const char *interface){

1753

struct ifreq ifr;

1754

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

1755

if(debug){

1756

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

1757

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

1758

}

1759

return false;

1760

}

1761

1762

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

1763

}

1764

1765

__attribute__((nonnull, pure, warn_unused_result))

1766

1133

int notdotentries(const struct dirent *direntry){

1767

1134

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

1768

1135

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

1774

1141

return 1;

1775

1142

}

1776

1143

1777

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

1778

__attribute__((nonnull, warn_unused_result))

1779

int runnable_hook(const struct dirent *direntry){

1780

int ret;

1781

size_t sret;

1782

struct stat st;

1783

1784

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

1785

/* Empty name? */

1786

return 0;

1787

}

1788

1789

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

1790

"abcdefghijklmnopqrstuvwxyz"

1791

"0123456789"

1792

"_.-");

1793

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

1794

/* Contains non-allowed characters */

1795

if(debug){

1796

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

1797

direntry->d_name);

1798

}

1799

return 0;

1800

}

1801

1802

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

1803

if(ret == -1){

1804

if(debug){

1805

perror_plus("Could not stat hook");

1806

}

1807

return 0;

1808

}

1809

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

1810

/* Not a regular file */

1811

if(debug){

1812

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

1813

direntry->d_name);

1814

}

1815

return 0;

1816

}

1817

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

1818

/* Not executable */

1819

if(debug){

1820

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

1821

direntry->d_name);

1822

}

1823

return 0;

1824

}

1825

if(debug){

1826

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

1827

direntry->d_name);

1828

}

1829

return 1;

1830

}

1831

1832

__attribute__((nonnull, warn_unused_result))

1833

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1834

mandos_context *mc){

1835

int ret;

1836

struct timespec now;

1837

struct timespec waited_time;

1838

intmax_t block_time;

1839

1840

while(true){

1841

if(mc->current_server == NULL){

1842

if(debug){

1843

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

1844

" No timeout!\n");

1845

}

1846

ret = avahi_simple_poll_iterate(s, -1);

1847

} else {

1848

if(debug){

1849

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

1850

" it, or wait\n");

1851

}

1852

/* the current time */

1853

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1854

if(ret == -1){

1855

perror_plus("clock_gettime");

1856

return -1;

1857

}

1858

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

1859

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

1860

waited_time.tv_sec = (now.tv_sec

1861

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

1862

waited_time.tv_nsec = (now.tv_nsec

1863

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

1864

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

1865

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

1866

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

1867

block_time = ((retry_interval

1868

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

1869

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

1870

1871

if(debug){

1872

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

1873

block_time);

1874

}

1875

1876

if(block_time <= 0){

1877

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

1878

mc->current_server->port,

1879

mc->current_server->if_index,

1880

mc->current_server->af, mc);

1881

if(ret == 0){

1882

avahi_simple_poll_quit(s);

1883

return 0;

1884

}

1885

ret = clock_gettime(CLOCK_MONOTONIC,

1886

&mc->current_server->last_seen);

1887

if(ret == -1){

1888

perror_plus("clock_gettime");

1889

return -1;

1890

}

1891

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

1892

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

1893

servers, but don't block */

1894

}

1895

1896

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

1897

}

1898

if(ret != 0){

1899

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

1900

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

1901

}

1902

}

1903

}

1904

}

1905

1906

__attribute__((nonnull))

1907

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

1908

const float delay){

1909

struct dirent **direntries = NULL;

1910

if(hookdir_fd == -1){

1911

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1912

| O_CLOEXEC);

1913

if(hookdir_fd == -1){

1914

if(errno == ENOENT){

1915

if(debug){

1916

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

1917

" found\n", hookdir);

1918

}

1919

} else {

1920

perror_plus("open");

1921

}

1922

return;

1923

}

1924

}

1925

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

1926

runnable_hook, alphasort);

1927

if(numhooks == -1){

1928

perror_plus("scandir");

1929

return;

1930

}

1931

struct dirent *direntry;

1932

int ret;

1933

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

1934

if(devnull == -1){

1935

perror_plus("open(\"/dev/null\", O_RDONLY)");

1936

return;

1937

}

1938

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

1939

direntry = direntries[i];

1940

if(debug){

1941

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

1942

direntry->d_name);

1943

}

1944

pid_t hook_pid = fork();

1945

if(hook_pid == 0){

1946

/* Child */

1947

/* Raise privileges */

1948

errno = raise_privileges_permanently();

1949

if(errno != 0){

1950

perror_plus("Failed to raise privileges");

1951

_exit(EX_NOPERM);

1952

}

1953

/* Set group */

1954

errno = 0;

1955

ret = setgid(0);

1956

if(ret == -1){

1957

perror_plus("setgid");

1958

_exit(EX_NOPERM);

1959

}

1960

/* Reset supplementary groups */

1961

errno = 0;

1962

ret = setgroups(0, NULL);

1963

if(ret == -1){

1964

perror_plus("setgroups");

1965

_exit(EX_NOPERM);

1966

}

1967

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

1968

if(ret == -1){

1969

perror_plus("setenv");

1970

_exit(EX_OSERR);

1971

}

1972

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

1973

if(ret == -1){

1974

perror_plus("setenv");

1975

_exit(EX_OSERR);

1976

}

1977

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

1978

if(ret == -1){

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

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

1983

if(ret == -1){

1984

perror_plus("setenv");

1985

_exit(EX_OSERR);

1986

}

1987

char *delaystring;

1988

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

1989

if(ret == -1){

1990

perror_plus("asprintf");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

free(delaystring);

1996

perror_plus("setenv");

1997

_exit(EX_OSERR);

1998

}

1999

free(delaystring);

2000

if(connect_to != NULL){

2001

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

2002

if(ret == -1){

2003

perror_plus("setenv");

2004

_exit(EX_OSERR);

2005

}

2006

}

2007

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2008

direntry->d_name,

2009

O_RDONLY));

2010

if(hook_fd == -1){

2011

perror_plus("openat");

2012

_exit(EXIT_FAILURE);

2013

}

2014

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

2015

perror_plus("close");

2016

_exit(EXIT_FAILURE);

2017

}

2018

ret = dup2(devnull, STDIN_FILENO);

2019

if(ret == -1){

2020

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

2021

_exit(EX_OSERR);

2022

}

2023

ret = close(devnull);

2024

if(ret == -1){

2025

perror_plus("close");

2026

_exit(EX_OSERR);

2027

}

2028

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2029

if(ret == -1){

2030

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

2031

_exit(EX_OSERR);

2032

}

2033

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

2034

environ) == -1){

2035

perror_plus("fexecve");

2036

_exit(EXIT_FAILURE);

2037

}

2038

} else {

2039

if(hook_pid == -1){

2040

perror_plus("fork");

2041

free(direntry);

2042

continue;

2043

}

2044

int status;

2045

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

2046

perror_plus("waitpid");

2047

free(direntry);

2048

continue;

2049

}

2050

if(WIFEXITED(status)){

2051

if(WEXITSTATUS(status) != 0){

2052

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

2053

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

2054

WEXITSTATUS(status));

2055

free(direntry);

2056

continue;

2057

}

2058

} else if(WIFSIGNALED(status)){

2059

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

2060

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

2061

WTERMSIG(status));

2062

free(direntry);

2063

continue;

2064

} else {

2065

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

2066

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

2067

free(direntry);

2068

continue;

2069

}

2070

}

2071

if(debug){

2072

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

2073

direntry->d_name);

2074

}

2075

free(direntry);

2076

}

2077

free(direntries);

2078

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

2079

perror_plus("close");

2080

} else {

2081

hookdir_fd = -1;

2082

}

2083

close(devnull);

2084

}

2085

2086

__attribute__((nonnull, warn_unused_result))

2087

int bring_up_interface(const char *const interface,

2088

const float delay){

2089

int old_errno = errno;

2090

int ret;

2091

struct ifreq network;

2092

unsigned int if_index = if_nametoindex(interface);

2093

if(if_index == 0){

2094

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

2095

errno = old_errno;

2096

return ENXIO;

2097

}

2098

2099

if(quit_now){

2100

errno = old_errno;

2101

return EINTR;

2102

}

2103

2104

if(not interface_is_up(interface)){

2105

int ret_errno = 0;

2106

int ioctl_errno = 0;

2107

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

2108

ret_errno = errno;

2109

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

2110

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

2111

errno = old_errno;

2112

return ret_errno;

2113

}

2114

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

2115

2116

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

2117

if(sd == -1){

2118

ret_errno = errno;

2119

perror_plus("socket");

2120

errno = old_errno;

2121

return ret_errno;

2122

}

2123

2124

if(quit_now){

2125

ret = close(sd);

2126

if(ret == -1){

2127

perror_plus("close");

2128

}

2129

errno = old_errno;

2130

return EINTR;

2131

}

2132

2133

if(debug){

2134

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

2135

interface);

2136

}

2137

2138

/* Raise privileges */

2139

ret_errno = raise_privileges();

2140

if(ret_errno != 0){

2141

errno = ret_errno;

2142

perror_plus("Failed to raise privileges");

2143

}

2144

2145

#ifdef __linux__

2146

int ret_linux;

2147

bool restore_loglevel = false;

2148

if(ret_errno == 0){

2149

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2150

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

2151

ret_linux = klogctl(8, NULL, 5);

2152

if(ret_linux == -1){

2153

perror_plus("klogctl");

2154

} else {

2155

restore_loglevel = true;

2156

}

2157

}

2158

#endif /* __linux__ */

2159

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

2160

ioctl_errno = errno;

2161

#ifdef __linux__

2162

if(restore_loglevel){

2163

ret_linux = klogctl(7, NULL, 0);

2164

if(ret_linux == -1){

2165

perror_plus("klogctl");

2166

}

2167

}

2168

#endif /* __linux__ */

2169

2170

/* If raise_privileges() succeeded above */

2171

if(ret_errno == 0){

2172

/* Lower privileges */

2173

ret_errno = lower_privileges();

2174

if(ret_errno != 0){

2175

errno = ret_errno;

2176

perror_plus("Failed to lower privileges");

2177

}

2178

}

2179

2180

/* Close the socket */

2181

ret = close(sd);

2182

if(ret == -1){

2183

perror_plus("close");

2184

}

2185

2186

if(ret_setflags == -1){

2187

errno = ioctl_errno;

2188

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2189

errno = old_errno;

2190

return ioctl_errno;

2191

}

2192

} else if(debug){

2193

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

2194

interface);

2195

}

2196

2197

/* Sleep checking until interface is running.

2198

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

2199

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

2200

if(interface_is_running(interface)){

2201

break;

2202

}

2203

struct timespec sleeptime = { .tv_nsec = 250000000 };

2204

ret = nanosleep(&sleeptime, NULL);

2205

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

2206

perror_plus("nanosleep");

2207

}

2208

}

2209

2210

errno = old_errno;

2211

return 0;

2212

}

2213

2214

__attribute__((nonnull, warn_unused_result))

2215

int take_down_interface(const char *const interface){

2216

int old_errno = errno;

2217

struct ifreq network;

2218

unsigned int if_index = if_nametoindex(interface);

2219

if(if_index == 0){

2220

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

2221

errno = old_errno;

2222

return ENXIO;

2223

}

2224

if(interface_is_up(interface)){

2225

int ret_errno = 0;

2226

int ioctl_errno = 0;

2227

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

2228

ret_errno = errno;

2229

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

2230

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

2231

errno = old_errno;

2232

return ret_errno;

2233

}

2234

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

2235

2236

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

2237

if(sd == -1){

2238

ret_errno = errno;

2239

perror_plus("socket");

2240

errno = old_errno;

2241

return ret_errno;

2242

}

2243

2244

if(debug){

2245

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

2246

interface);

2247

}

2248

2249

/* Raise privileges */

2250

ret_errno = raise_privileges();

2251

if(ret_errno != 0){

2252

errno = ret_errno;

2253

perror_plus("Failed to raise privileges");

2254

}

2255

2256

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

2257

ioctl_errno = errno;

2258

2259

/* If raise_privileges() succeeded above */

2260

if(ret_errno == 0){

2261

/* Lower privileges */

2262

ret_errno = lower_privileges();

2263

if(ret_errno != 0){

2264

errno = ret_errno;

2265

perror_plus("Failed to lower privileges");

2266

}

2267

}

2268

2269

/* Close the socket */

2270

int ret = close(sd);

2271

if(ret == -1){

2272

perror_plus("close");

2273

}

2274

2275

if(ret_setflags == -1){

2276

errno = ioctl_errno;

2277

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2278

errno = old_errno;

2279

return ioctl_errno;

2280

}

2281

} else if(debug){

2282

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

2283

interface);

2284

}

2285

2286

errno = old_errno;

2287

return 0;

2288

}

2289

2290

1144

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

2291

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

2292

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

2293

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

2296

1145

AvahiSServiceBrowser *sb = NULL;

2297

error_t ret_errno;

1146

int error;

2298

1147

int ret;

2299

1148

intmax_t tmpmax;

2300

1149

char *tmp;

2301

1150

int exitcode = EXIT_SUCCESS;

2302

char *interfaces_to_take_down = NULL;

2303

size_t interfaces_to_take_down_size = 0;

2304

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

2305

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

2306

char *tempdir = NULL;

1151

const char *interface = "";

1152

struct ifreq network;

1153

int sd = -1;

1154

bool take_down_interface = false;

1155

uid_t uid;

1156

gid_t gid;

1157

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

1158

bool tempdir_created = false;

2307

1159

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2308

1160

const char *seckey = PATHDIR "/" SECKEY;

2309

1161

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

2311

char *interfaces_hooks = NULL;

2312

1162

2313

1163

bool gnutls_initialized = false;

2314

1164

bool gpgme_initialized = false;

2315

1165

float delay = 2.5f;

2316

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

2317

retrying the same server again */

2318

1166

2319

1167

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

2320

1168

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

2326

1174

errno = 0;

2327

1175

ret = setgid(gid);

2328

1176

if(ret == -1){

2329

perror_plus("setgid");

1177

perror("setgid");

2330

1178

}

2331

1179

2332

1180

/* Lower user privileges (temporarily) */

2333

1181

errno = 0;

2334

1182

ret = seteuid(uid);

2335

1183

if(ret == -1){

2336

perror_plus("seteuid");

1184

perror("seteuid");

2337

1185

}

2338

1186

2339

1187

if(quit_now){

2366

1214

.doc = "Bit length of the prime number used in the"

2367

1215

" Diffie-Hellman key exchange",

2368

1216

.group = 2 },

2369

{ .name = "dh-params", .key = 134,

2370

.arg = "FILE",

2371

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

2374

1217

{ .name = "priority", .key = 130,

2375

1218

.arg = "STRING",

2376

1219

.doc = "GnuTLS priority string for the TLS handshake",

2379

1222

.arg = "SECONDS",

2380

1223

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

2381

1224

.group = 2 },

2382

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

2383

.arg = "SECONDS",

2384

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

2385

.group = 2 },

2386

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

2387

.arg = "DIR",

2388

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

2389

.group = 2 },

2390

1225

/*

2391

1226

* These reproduce what we would get without ARGP_NO_HELP

2392

1227

*/

2410

1245

connect_to = arg;

2411

1246

break;

2412

1247

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

2413

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

2414

arg, (int)',');

2415

if(ret_errno != 0){

2416

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

2417

}

1248

interface = arg;

2418

1249

break;

2419

1250

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

2420

1251

seckey = arg;

2431

1262

}

2432

1263

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

2433

1264

break;

2434

case 134: /* --dh-params */

2435

dh_params_file = arg;

2436

break;

2437

1265

case 130: /* --priority */

2438

1266

mc.priority = arg;

2439

1267

break;

2443

1271

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

2444

1272

argp_error(state, "Bad delay");

2445

1273

}

2446

case 132: /* --retry */

2447

errno = 0;

2448

retry_interval = strtod(arg, &tmp);

2449

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

2450

or (retry_interval * 1000) > INT_MAX

2451

or retry_interval < 0){

2452

argp_error(state, "Bad retry interval");

2453

}

2454

break;

2455

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

2456

hookdir = arg;

2457

1274

break;

2458

1275

/*

2459

1276

* These reproduce what we would get without ARGP_NO_HELP

2466

1283

argp_state_help(state, state->out_stream,

2467

1284

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2468

1285

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

2469

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

1286

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

2470

1287

exit(argp_err_exit_status);

2471

1288

break;

2472

1289

default:

2479

1296

.args_doc = "",

2480

1297

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

2481

1298

" passwords from a Mandos server" };

2482

ret_errno = argp_parse(&argp, argc, argv,

2483

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2484

switch(ret_errno){

1299

ret = argp_parse(&argp, argc, argv,

1300

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1301

switch(ret){

2485

1302

case 0:

2486

1303

break;

2487

1304

case ENOMEM:

2488

1305

default:

2489

errno = ret_errno;

2490

perror_plus("argp_parse");

1306

errno = ret;

1307

perror("argp_parse");

2491

1308

exitcode = EX_OSERR;

2492

1309

goto end;

2493

1310

case EINVAL:

2496

1313

}

2497

1314

}

2498

1315

2499

{

2500

/* Work around Debian bug #633582:

2501

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

2502

2503

/* Re-raise privileges */

2504

ret = raise_privileges();

2505

if(ret != 0){

2506

errno = ret;

2507

perror_plus("Failed to raise privileges");

2508

} else {

2509

struct stat st;

2510

2511

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

2512

int seckey_fd = open(seckey, O_RDONLY);

2513

if(seckey_fd == -1){

2514

perror_plus("open");

2515

} else {

2516

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

2517

if(ret == -1){

2518

perror_plus("fstat");

2519

} else {

2520

if(S_ISREG(st.st_mode)

2521

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

2522

ret = fchown(seckey_fd, uid, gid);

2523

if(ret == -1){

2524

perror_plus("fchown");

2525

}

2526

}

2527

}

2528

close(seckey_fd);

2529

}

2530

}

2531

2532

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

2533

int pubkey_fd = open(pubkey, O_RDONLY);

2534

if(pubkey_fd == -1){

2535

perror_plus("open");

2536

} else {

2537

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

2538

if(ret == -1){

2539

perror_plus("fstat");

2540

} else {

2541

if(S_ISREG(st.st_mode)

2542

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

2543

ret = fchown(pubkey_fd, uid, gid);

2544

if(ret == -1){

2545

perror_plus("fchown");

2546

}

2547

}

2548

}

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2572

}

2573

}

2574

2575

/* Lower privileges */

2576

ret = lower_privileges();

2577

if(ret != 0){

2578

errno = ret;

2579

perror_plus("Failed to lower privileges");

2580

}

2581

}

2582

}

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

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

2588

interface))){

2589

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

2590

and if_nametoindex(interface) == 0){

2591

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

2592

fprintf_plus(stderr, "Not using nonexisting interface"

2593

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

2594

}

2595

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

2596

interface = NULL;

2597

}

2598

}

2599

}

2600

2601

/* Run network hooks */

2602

{

2603

if(mc.interfaces != NULL){

2604

interfaces_hooks = malloc(mc.interfaces_size);

2605

if(interfaces_hooks == NULL){

2606

perror_plus("malloc");

2607

goto end;

2608

}

2609

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

2610

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

2611

}

2612

run_network_hooks("start", interfaces_hooks != NULL ?

2613

interfaces_hooks : "", delay);

2614

}

2615

2616

1316

if(not debug){

2617

1317

avahi_set_log_function(empty_log);

2618

1318

}

1319

1320

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

1321

struct dirent **direntries;

1322

ret = scandir(sys_class_net, &direntries, good_interface,

1323

alphasort);

1324

if(ret >= 1){

1325

/* Pick the first good interface */

1326

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

1327

if(debug){

1328

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

1329

}

1330

if(interface == NULL){

1331

perror("malloc");

1332

free(direntries);

1333

exitcode = EXIT_FAILURE;

1334

goto end;

1335

}

1336

free(direntries);

1337

} else {

1338

free(direntries);

1339

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

1340

exitcode = EXIT_FAILURE;

1341

goto end;

1342

}

1343

}

2619

1344

2620

1345

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

2621

1346

from the signal handler */

2622

1347

/* Initialize the pseudo-RNG for Avahi */

2623

1348

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

2624

simple_poll = avahi_simple_poll_new();

2625

if(simple_poll == NULL){

2626

fprintf_plus(stderr,

2627

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

1349

mc.simple_poll = avahi_simple_poll_new();

1350

if(mc.simple_poll == NULL){

1351

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

2628

1352

exitcode = EX_UNAVAILABLE;

2629

1353

goto end;

2630

1354

}

2632

1356

sigemptyset(&sigterm_action.sa_mask);

2633

1357

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

2634

1358

if(ret == -1){

2635

perror_plus("sigaddset");

1359

perror("sigaddset");

2636

1360

exitcode = EX_OSERR;

2637

1361

goto end;

2638

1362

}

2639

1363

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

2640

1364

if(ret == -1){

2641

perror_plus("sigaddset");

1365

perror("sigaddset");

2642

1366

exitcode = EX_OSERR;

2643

1367

goto end;

2644

1368

}

2645

1369

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

2646

1370

if(ret == -1){

2647

perror_plus("sigaddset");

1371

perror("sigaddset");

2648

1372

exitcode = EX_OSERR;

2649

1373

goto end;

2650

1374

}

2654

1378

*/

2655

1379

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

2656

1380

if(ret == -1){

2657

perror_plus("sigaction");

1381

perror("sigaction");

2658

1382

return EX_OSERR;

2659

1383

}

2660

1384

if(old_sigterm_action.sa_handler != SIG_IGN){

2661

1385

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

2662

1386

if(ret == -1){

2663

perror_plus("sigaction");

1387

perror("sigaction");

2664

1388

exitcode = EX_OSERR;

2665

1389

goto end;

2666

1390

}

2667

1391

}

2668

1392

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

2669

1393

if(ret == -1){

2670

perror_plus("sigaction");

1394

perror("sigaction");

2671

1395

return EX_OSERR;

2672

1396

}

2673

1397

if(old_sigterm_action.sa_handler != SIG_IGN){

2674

1398

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

2675

1399

if(ret == -1){

2676

perror_plus("sigaction");

1400

perror("sigaction");

2677

1401

exitcode = EX_OSERR;

2678

1402

goto end;

2679

1403

}

2680

1404

}

2681

1405

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

2682

1406

if(ret == -1){

2683

perror_plus("sigaction");

1407

perror("sigaction");

2684

1408

return EX_OSERR;

2685

1409

}

2686

1410

if(old_sigterm_action.sa_handler != SIG_IGN){

2687

1411

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

2688

1412

if(ret == -1){

2689

perror_plus("sigaction");

1413

perror("sigaction");

2690

1414

exitcode = EX_OSERR;

2691

1415

goto end;

2692

1416

}

2693

1417

}

2694

1418

2695

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

2696

if(mc.interfaces == NULL){

2697

struct dirent **direntries = NULL;

2698

/* Look for any good interfaces */

2699

ret = scandir(sys_class_net, &direntries, good_interface,

2700

alphasort);

2701

if(ret >= 1){

2702

/* Add all found interfaces to interfaces list */

2703

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

2704

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

2705

direntries[i]->d_name);

2706

if(ret_errno != 0){

2707

errno = ret_errno;

2708

perror_plus("argz_add");

2709

free(direntries[i]);

2710

continue;

2711

}

2712

if(debug){

2713

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

2714

direntries[i]->d_name);

2715

}

2716

free(direntries[i]);

2717

}

2718

free(direntries);

1419

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

1420

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

1421

if_index = (AvahiIfIndex) if_nametoindex(interface);

1422

if(if_index == 0){

1423

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

1424

exitcode = EX_UNAVAILABLE;

1425

goto end;

1426

}

1427

1428

if(quit_now){

1429

goto end;

1430

}

1431

1432

/* Re-raise priviliges */

1433

errno = 0;

1434

ret = seteuid(0);

1435

if(ret == -1){

1436

perror("seteuid");

1437

}

1438

1439

#ifdef __linux__

1440

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1441

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

1442

ret = klogctl(8, NULL, 5);

1443

bool restore_loglevel = true;

1444

if(ret == -1){

1445

restore_loglevel = false;

1446

perror("klogctl");

1447

}

1448

#endif /* __linux__ */

1449

1450

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1451

if(sd < 0){

1452

perror("socket");

1453

exitcode = EX_OSERR;

1454

#ifdef __linux__

1455

if(restore_loglevel){

1456

ret = klogctl(7, NULL, 0);

1457

if(ret == -1){

1458

perror("klogctl");

1459

}

1460

}

1461

#endif /* __linux__ */

1462

/* Lower privileges */

1463

errno = 0;

1464

ret = seteuid(uid);

1465

if(ret == -1){

1466

perror("seteuid");

1467

}

1468

goto end;

1469

}

1470

strcpy(network.ifr_name, interface);

1471

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

1472

if(ret == -1){

1473

perror("ioctl SIOCGIFFLAGS");

1474

#ifdef __linux__

1475

if(restore_loglevel){

1476

ret = klogctl(7, NULL, 0);

1477

if(ret == -1){

1478

perror("klogctl");

1479

}

1480

}

1481

#endif /* __linux__ */

1482

exitcode = EX_OSERR;

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1489

goto end;

1490

}

1491

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

1492

network.ifr_flags |= IFF_UP;

1493

take_down_interface = true;

1494

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

1495

if(ret == -1){

1496

take_down_interface = false;

1497

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1498

exitcode = EX_OSERR;

1499

#ifdef __linux__

1500

if(restore_loglevel){

1501

ret = klogctl(7, NULL, 0);

1502

if(ret == -1){

1503

perror("klogctl");

1504

}

1505

}

1506

#endif /* __linux__ */

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror("seteuid");

1512

}

1513

goto end;

1514

}

1515

}

1516

/* sleep checking until interface is running */

1517

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

1518

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

1519

if(ret == -1){

1520

perror("ioctl SIOCGIFFLAGS");

1521

} else if(network.ifr_flags & IFF_RUNNING){

1522

break;

1523

}

1524

struct timespec sleeptime = { .tv_nsec = 250000000 };

1525

ret = nanosleep(&sleeptime, NULL);

1526

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

1527

perror("nanosleep");

1528

}

1529

}

1530

if(not take_down_interface){

1531

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

1532

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

1533

if(ret == -1){

1534

perror("close");

1535

}

1536

}

1537

#ifdef __linux__

1538

if(restore_loglevel){

1539

/* Restores kernel loglevel to default */

1540

ret = klogctl(7, NULL, 0);

1541

if(ret == -1){

1542

perror("klogctl");

1543

}

1544

}

1545

#endif /* __linux__ */

1546

/* Lower privileges */

1547

errno = 0;

1548

if(take_down_interface){

1549

/* Lower privileges */

1550

ret = seteuid(uid);

1551

if(ret == -1){

1552

perror("seteuid");

1553

}

2719

1554

} else {

2720

if(ret == 0){

2721

free(direntries);

2722

}

2723

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

2724

exitcode = EXIT_FAILURE;

2725

goto end;

2726

}

2727

}

2728

2729

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

2730

{

2731

char *interface = NULL;

2732

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

2733

interface))){

2734

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

2735

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

2736

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

2737

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

2738

interface);

2739

interface = NULL;

2740

while((interface = argz_next(mc.interfaces,

2741

mc.interfaces_size, interface))){

2742

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

2743

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

2744

interface);

2745

interface = NULL;

2746

}

2747

}

2748

break;

2749

}

2750

bool interface_was_up = interface_is_up(interface);

2751

errno = bring_up_interface(interface, delay);

2752

if(not interface_was_up){

2753

if(errno != 0){

2754

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2755

" %s\n", interface, strerror(errno));

2756

} else {

2757

errno = argz_add(&interfaces_to_take_down,

2758

&interfaces_to_take_down_size,

2759

interface);

2760

if(errno != 0){

2761

perror_plus("argz_add");

2762

}

2763

}

2764

}

2765

}

2766

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

2767

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

2768

}

2769

}

2770

2771

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

2772

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

2773

if(debug){

2774

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

2775

mc.interfaces);

2776

}

2777

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

1555

/* Lower privileges permanently */

1556

ret = setuid(uid);

1557

if(ret == -1){

1558

perror("setuid");

1559

}

1560

}

2778

1561

}

2779

1562

2780

1563

if(quit_now){

2781

1564

goto end;

2782

1565

}

2783

1566

2784

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

1567

ret = init_gnutls_global(pubkey, seckey);

2785

1568

if(ret == -1){

2786

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

1569

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

2787

1570

exitcode = EX_UNAVAILABLE;

2788

1571

goto end;

2789

1572

} else {

2794

1577

goto end;

2795

1578

}

2796

1579

2797

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

2798

tempdir = mkdtemp(run_tempdir);

2799

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

2800

if(debug){

2801

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

2802

run_tempdir, old_tempdir);

2803

}

2804

tempdir = mkdtemp(old_tempdir);

2805

}

2806

if(tempdir == NULL){

2807

perror_plus("mkdtemp");

1580

if(mkdtemp(tempdir) == NULL){

1581

perror("mkdtemp");

2808

1582

goto end;

2809

1583

}

1584

tempdir_created = true;

2810

1585

2811

1586

if(quit_now){

2812

1587

goto end;

2813

1588

}

2814

1589

2815

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

2816

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

1590

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

1591

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

2817

1592

exitcode = EX_UNAVAILABLE;

2818

1593

goto end;

2819

1594

} else {

2828

1603

/* Connect directly, do not use Zeroconf */

2829

1604

/* (Mainly meant for debugging) */

2830

1605

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

2831

2832

1606

if(address == NULL){

2833

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

1607

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

2834

1608

exitcode = EX_USAGE;

2835

1609

goto end;

2836

1610

}

2839

1613

goto end;

2840

1614

}

2841

1615

2842

in_port_t port;

1616

uint16_t port;

2843

1617

errno = 0;

2844

1618

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

2845

1619

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

2846

or tmpmax != (in_port_t)tmpmax){

2847

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

1620

or tmpmax != (uint16_t)tmpmax){

1621

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

2848

1622

exitcode = EX_USAGE;

2849

1623

goto end;

2850

1624

}

2851

1625

2852

1626

if(quit_now){

2853

1627

goto end;

2854

1628

}

2855

1629

2856

port = (in_port_t)tmpmax;

1630

port = (uint16_t)tmpmax;

2857

1631

*address = '\0';

1632

address = connect_to;

2858

1633

/* Colon in address indicates IPv6 */

2859

1634

int af;

2860

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

1635

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

2861

1636

af = AF_INET6;

2862

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

2863

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

2864

{

2865

connect_to++;

2866

address[-1] = '\0';

2867

}

2868

1637

} else {

2869

1638

af = AF_INET;

2870

1639

}

2871

address = connect_to;

2872

1640

2873

1641

if(quit_now){

2874

1642

goto end;

2875

1643

}

2876

1644

2877

1645

while(not quit_now){

2878

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

2879

&mc);

1646

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

2880

1647

if(quit_now or ret == 0){

2881

1648

break;

2882

1649

}

2883

if(debug){

2884

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

2885

(int)retry_interval);

2886

}

2887

sleep((unsigned int)retry_interval);

2888

}

2889

2890

if(not quit_now){

1650

sleep(15);

1651

};

1652

1653

if (not quit_now){

2891

1654

exitcode = EXIT_SUCCESS;

2892

1655

}

2893

1656

2894

1657

goto end;

2895

1658

}

2896

1659

2908

1671

config.publish_domain = 0;

2909

1672

2910

1673

/* Allocate a new server */

2911

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2912

&config, NULL, NULL, &ret);

1674

mc.server = avahi_server_new(avahi_simple_poll_get

1675

(mc.simple_poll), &config, NULL,

1676

NULL, &error);

2913

1677

2914

1678

/* Free the Avahi configuration data */

2915

1679

avahi_server_config_free(&config);

2917

1681

2918

1682

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

2919

1683

if(mc.server == NULL){

2920

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

2921

avahi_strerror(ret));

1684

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

1685

avahi_strerror(error));

2922

1686

exitcode = EX_UNAVAILABLE;

2923

1687

goto end;

2924

1688

}

2930

1694

/* Create the Avahi service browser */

2931

1695

sb = avahi_s_service_browser_new(mc.server, if_index,

2932

1696

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2933

NULL, 0, browse_callback,

2934

(void *)&mc);

1697

NULL, 0, browse_callback, NULL);

2935

1698

if(sb == NULL){

2936

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

2937

avahi_strerror(avahi_server_errno(mc.server)));

1699

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

1700

avahi_strerror(avahi_server_errno(mc.server)));

2938

1701

exitcode = EX_UNAVAILABLE;

2939

1702

goto end;

2940

1703

}

2946

1709

/* Run the main loop */

2947

1710

2948

1711

if(debug){

2949

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

1712

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

2950

1713

}

2951

1714

2952

ret = avahi_loop_with_timeout(simple_poll,

2953

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

2954

if(debug){

2955

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

2956

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

2957

}

1715

avahi_simple_poll_loop(mc.simple_poll);

2958

1716

2959

1717

end:

2960

1718

2961

1719

if(debug){

2962

if(signal_received){

2963

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2964

argv[0], signal_received,

2965

strsignal(signal_received));

2966

} else {

2967

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

2968

}

1720

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

2969

1721

}

2970

1722

2971

1723

/* Cleanup things */

2972

free(mc.interfaces);

2973

2974

1724

if(sb != NULL)

2975

1725

avahi_s_service_browser_free(sb);

2976

1726

2977

1727

if(mc.server != NULL)

2978

1728

avahi_server_free(mc.server);

2979

1729

2980

if(simple_poll != NULL)

2981

avahi_simple_poll_free(simple_poll);

1730

if(mc.simple_poll != NULL)

1731

avahi_simple_poll_free(mc.simple_poll);

2982

1732

2983

1733

if(gnutls_initialized){

2984

1734

gnutls_certificate_free_credentials(mc.cred);

1735

gnutls_global_deinit();

2985

1736

gnutls_dh_params_deinit(mc.dh_params);

2986

1737

}

2987

1738

2989

1740

gpgme_release(mc.ctx);

2990

1741

}

2991

1742

2992

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

2993

has seen */

2994

if(mc.current_server != NULL){

2995

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

2996

while(mc.current_server != NULL){

2997

server *next = mc.current_server->next;

2998

#ifdef __GNUC__

2999

#pragma GCC diagnostic push

3000

#pragma GCC diagnostic ignored "-Wcast-qual"

3001

#endif

3002

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

3003

#ifdef __GNUC__

3004

#pragma GCC diagnostic pop

3005

#endif

3006

free(mc.current_server);

3007

mc.current_server = next;

3008

}

3009

}

3010

3011

/* Re-raise privileges */

3012

{

3013

ret = raise_privileges();

3014

if(ret != 0){

3015

errno = ret;

3016

perror_plus("Failed to raise privileges");

3017

} else {

3018

3019

/* Run network hooks */

3020

run_network_hooks("stop", interfaces_hooks != NULL ?

3021

interfaces_hooks : "", delay);

3022

3023

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

3024

{

3025

char *interface = NULL;

3026

while((interface=argz_next(interfaces_to_take_down,

3027

interfaces_to_take_down_size,

3028

interface))){

3029

ret = take_down_interface(interface);

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to take down interface");

3033

}

3034

}

3035

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

3036

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

3037

" down\n");

3038

}

3039

}

3040

}

3041

3042

ret = lower_privileges_permanently();

3043

if(ret != 0){

3044

errno = ret;

3045

perror_plus("Failed to lower privileges permanently");

3046

}

3047

}

3048

3049

free(interfaces_to_take_down);

3050

free(interfaces_hooks);

3051

3052

void clean_dir_at(int base, const char * const dirname,

3053

uintmax_t level){

3054

struct dirent **direntries = NULL;

3055

int dret;

3056

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3057

O_RDONLY

3058

| O_NOFOLLOW

3059

| O_DIRECTORY

3060

| O_PATH));

3061

if(dir_fd == -1){

3062

perror_plus("open");

3063

}

3064

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

3065

notdotentries, alphasort);

3066

if(numentries >= 0){

3067

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

3068

if(debug){

3069

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3070

dirname, direntries[i]->d_name);

3071

}

3072

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3073

if(dret == -1){

3074

if(errno == EISDIR){

3075

dret = unlinkat(dir_fd, direntries[i]->d_name,

3076

AT_REMOVEDIR);

3077

}

3078

if((dret == -1) and (errno == ENOTEMPTY)

3079

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3080

== 0) and (level == 0)){

3081

/* Recurse only in this special case */

3082

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3083

dret = 0;

3084

}

3085

if(dret == -1){

3086

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3087

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

3088

}

3089

}

3090

free(direntries[i]);

3091

}

3092

3093

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

3094

free(direntries);

3095

if(numentries == -1){

3096

perror_plus("scandirat");

3097

}

3098

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3099

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

3100

perror_plus("rmdir");

3101

}

3102

} else {

3103

perror_plus("scandirat");

3104

}

3105

close(dir_fd);

1743

/* Take down the network interface */

1744

if(take_down_interface){

1745

/* Re-raise priviliges */

1746

errno = 0;

1747

ret = seteuid(0);

1748

if(ret == -1){

1749

perror("seteuid");

1750

}

1751

if(geteuid() == 0){

1752

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

1753

if(ret == -1){

1754

perror("ioctl SIOCGIFFLAGS");

1755

} else if(network.ifr_flags & IFF_UP) {

1756

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

1757

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

1758

if(ret == -1){

1759

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1760

}

1761

}

1762

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

1763

if(ret == -1){

1764

perror("close");

1765

}

1766

/* Lower privileges permanently */

1767

errno = 0;

1768

ret = setuid(uid);

1769

if(ret == -1){

1770

perror("setuid");

1771

}

1772

}

3106

1773

}

3107

1774

3108

1775

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

3109

if(tempdir != NULL){

3110

clean_dir_at(-1, tempdir, 0);

1776

if(tempdir_created){

1777

struct dirent **direntries = NULL;

1778

struct dirent *direntry = NULL;

1779

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

1780

if (ret > 0){

1781

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

1782

direntry = direntries[i];

1783

char *fullname = NULL;

1784

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

1785

direntry->d_name);

1786

if(ret < 0){

1787

perror("asprintf");

1788

continue;

1789

}

1790

ret = remove(fullname);

1791

if(ret == -1){

1792

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

1793

strerror(errno));

1794

}

1795

free(fullname);

1796

}

1797

}

1798

1799

/* need to be cleaned even if ret == 0 because man page dont specify */

1800

free(direntries);

1801

if (ret == -1){

1802

perror("scandir");

1803

}

1804

ret = rmdir(tempdir);

1805

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

1806

perror("rmdir");

1807

}

3111

1808

}

3112

1809

3113

1810

if(quit_now){

3117

1814

&old_sigterm_action,

3118

1815

NULL));

3119

1816

if(ret == -1){

3120

perror_plus("sigaction");

1817

perror("sigaction");

3121

1818

}

3122

1819

do {

3123

1820

ret = raise(signal_received);

3124

1821

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

3125

1822

if(ret != 0){

3126

perror_plus("raise");

1823

perror("raise");

3127

1824

abort();

3128

1825

}

3129

1826

TEMP_FAILURE_RETRY(pause());