/mandos/trunk : revision 518.2.11

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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

32

/* 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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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() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause(), _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, inet_ntop() */

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

197

198

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/*

199

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

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

201

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* "buffer_length" is how much is already used.

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177

*/

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__attribute__((nonnull, warn_unused_result))

204

178

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){

206

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

181

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

182

if(buffer == NULL){

213

183

return 0;

214

184

}

215

*buffer = new_buf;

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185

buffer_capacity += BUFFER_SIZE;

217

186

}

218

187

return buffer_capacity;

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}

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189

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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int ret;

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

227

196

if(new_server == NULL){

228

197

perror_plus("malloc");

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return false;

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return -1;

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199

}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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205

perror_plus("strdup");

237

return false;

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

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return -1;

243

207

}

244

208

/* Special case of first server */

245

if(*current_server == NULL){

209

if (mc.current_server == NULL){

246

210

new_server->next = new_server;

247

211

new_server->prev = new_server;

248

*current_server = new_server;

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mc.current_server = new_server;

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

249

214

} 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->next = mc.current_server;

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

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217

new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

256

return true;

218

mc.current_server->prev = new_server;

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}

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

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

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}

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return 0;

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}

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227

259

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/*

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* Initialize GPGME.

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*/

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__attribute__((nonnull, warn_unused_result))

263

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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/*

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

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*/

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bool import_key(const char * const filename){

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bool import_key(const char *filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

293

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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263

}

297

264

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271

}

305

272

306

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if(debug){

307

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

274

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

308

275

}

309

276

310

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/* Init GPGME */

311

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gpgme_check_version(NULL);

312

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

313

280

if(rc != GPG_ERR_NO_ERROR){

314

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

315

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

316

283

return false;

317

284

}

318

285

319

286

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

320

287

rc = gpgme_get_engine_info(&engine_info);

321

288

if(rc != GPG_ERR_NO_ERROR){

322

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

323

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

324

291

return false;

325

292

}

326

293

while(engine_info != NULL){

332

299

engine_info = engine_info->next;

333

300

}

334

301

if(engine_info == NULL){

335

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

336

tempdir);

302

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

337

303

return false;

338

304

}

339

305

340

306

/* Create new GPGME "context" */

341

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

307

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

342

308

if(rc != GPG_ERR_NO_ERROR){

343

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

344

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

345

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

346

311

return false;

347

312

}

348

313

357

322

* Decrypt OpenPGP data.

358

323

* Returns -1 on error

359

324

*/

360

__attribute__((nonnull, warn_unused_result))

361

325

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

326

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

327

char **plaintext){

365

328

gpgme_data_t dh_crypto, dh_plain;

366

329

gpgme_error_t rc;

367

330

ssize_t ret;

369

332

ssize_t plaintext_length = 0;

370

333

371

334

if(debug){

372

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

335

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

373

336

}

374

337

375

338

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

376

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

377

340

0);

378

341

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

381

344

return -1;

382

345

}

383

346

384

347

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

385

348

rc = gpgme_data_new(&dh_plain);

386

349

if(rc != GPG_ERR_NO_ERROR){

387

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

388

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

389

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

390

352

gpgme_data_release(dh_crypto);

391

353

return -1;

392

354

}

393

355

394

356

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

395

357

data buffer */

396

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

358

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

397

359

if(rc != GPG_ERR_NO_ERROR){

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

400

362

plaintext_length = -1;

401

363

if(debug){

402

364

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

365

result = gpgme_op_decrypt_result(mc.ctx);

404

366

if(result == NULL){

405

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

367

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

406

368

} else {

407

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

408

result->unsupported_algorithm);

409

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

410

result->wrong_key_usage);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

411

373

if(result->file_name != NULL){

412

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

374

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

413

375

}

414

376

gpgme_recipient_t recipient;

415

377

recipient = result->recipients;

416

378

while(recipient != NULL){

417

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

418

gpgme_pubkey_algo_name

419

(recipient->pubkey_algo));

420

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

421

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

422

recipient->status == GPG_ERR_NO_SECKEY

423

? "No" : "Yes");

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

424

385

recipient = recipient->next;

425

386

}

426

387

}

429

390

}

430

391

431

392

if(debug){

432

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

393

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

433

394

}

434

395

435

396

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

442

403

*plaintext = NULL;

443

404

while(true){

444

405

plaintext_capacity = incbuffer(plaintext,

445

(size_t)plaintext_length,

446

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

447

408

if(plaintext_capacity == 0){

448

perror_plus("incbuffer");

449

plaintext_length = -1;

450

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

451

412

}

452

413

453

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

466

427

}

467

428

468

429

if(debug){

469

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

430

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

470

431

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

471

432

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

472

433

}

483

444

return plaintext_length;

484

445

}

485

446

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

489

450

if(ret == NULL)

490

451

ret = "(unknown)";

491

452

return ret;

492

453

}

493

454

494

455

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

456

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

497

457

const char* string){

498

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

458

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

499

459

}

500

460

501

__attribute__((nonnull, warn_unused_result))

502

461

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

462

const char *seckeyfilename){

505

463

int ret;

506

464

507

465

if(debug){

508

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

466

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

509

467

}

510

468

511

469

ret = gnutls_global_init();

512

470

if(ret != GNUTLS_E_SUCCESS){

513

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

514

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

515

473

return -1;

516

474

}

517

475

524

482

}

525

483

526

484

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

528

486

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

531

489

gnutls_global_deinit();

532

490

return -1;

533

491

}

534

492

535

493

if(debug){

536

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

537

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

538

pubkeyfilename,

539

seckeyfilename);

494

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

495

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

496

seckeyfilename);

540

497

}

541

498

542

499

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

500

(mc.cred, pubkeyfilename, seckeyfilename,

544

501

GNUTLS_OPENPGP_FMT_BASE64);

545

502

if(ret != GNUTLS_E_SUCCESS){

546

fprintf_plus(stderr,

547

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

548

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

549

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

550

safer_gnutls_strerror(ret));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

551

508

goto globalfail;

552

509

}

553

510

554

511

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

512

ret = gnutls_dh_params_init(&mc.dh_params);

556

513

if(ret != GNUTLS_E_SUCCESS){

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

" initialization: %s\n",

559

safer_gnutls_strerror(ret));

514

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

515

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

560

516

goto globalfail;

561

517

}

562

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

518

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

563

519

if(ret != GNUTLS_E_SUCCESS){

564

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

565

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

566

522

goto globalfail;

567

523

}

568

524

569

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

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

526

571

527

return 0;

572

528

573

529

globalfail:

574

530

575

gnutls_certificate_free_credentials(mc->cred);

531

gnutls_certificate_free_credentials(mc.cred);

576

532

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

533

gnutls_dh_params_deinit(mc.dh_params);

578

534

return -1;

579

535

}

580

536

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

537

static int init_gnutls_session(gnutls_session_t *session){

584

538

int ret;

585

539

/* GnuTLS session creation */

586

540

do {

590

544

}

591

545

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

592

546

if(ret != GNUTLS_E_SUCCESS){

593

fprintf_plus(stderr,

594

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

595

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

596

549

}

597

550

598

551

{

599

552

const char *err;

600

553

do {

601

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

554

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

602

555

if(quit_now){

603

556

gnutls_deinit(*session);

604

557

return -1;

605

558

}

606

559

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

607

560

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

610

safer_gnutls_strerror(ret));

561

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

562

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

563

safer_gnutls_strerror(ret));

611

564

gnutls_deinit(*session);

612

565

return -1;

613

566

}

615

568

616

569

do {

617

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

571

mc.cred);

619

572

if(quit_now){

620

573

gnutls_deinit(*session);

621

574

return -1;

622

575

}

623

576

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

624

577

if(ret != GNUTLS_E_SUCCESS){

625

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

626

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

627

580

gnutls_deinit(*session);

628

581

return -1;

629

582

}

631

584

/* ignore client certificate if any. */

632

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

586

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

588

636

589

return 0;

637

590

}

641

594

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

642

595

643

596

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

597

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

646

598

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

599

int af){

648

600

int ret, tcp_sd = -1;

649

601

ssize_t sret;

650

struct sockaddr_storage to;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

651

606

char *buffer = NULL;

652

607

char *decrypted_buffer = NULL;

653

608

size_t buffer_length = 0;

672

627

pf = PF_INET;

673

628

break;

674

629

default:

675

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

630

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

676

631

errno = EINVAL;

677

632

return -1;

678

633

}

679

634

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

635

ret = init_gnutls_session(&session);

713

636

if(ret != 0){

714

637

return -1;

715

638

}

716

639

717

640

if(debug){

718

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

719

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

641

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

642

"\n", ip, port);

720

643

}

721

644

722

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

734

657

735

658

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

736

659

if(af == AF_INET6){

737

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

738

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

660

to.in6.sin6_family = (sa_family_t)af;

661

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

739

662

} else { /* IPv4 */

740

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

741

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

663

to.in.sin_family = (sa_family_t)af;

664

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

742

665

}

743

666

if(ret < 0 ){

744

667

int e = errno;

748

671

}

749

672

if(ret == 0){

750

673

int e = errno;

751

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

674

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

752

675

errno = e;

753

676

goto mandos_end;

754

677

}

755

678

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

759

686

if(if_index == AVAHI_IF_UNSPEC){

760

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

761

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

762

689

errno = EINVAL;

763

690

goto mandos_end;

764

691

}

765

692

/* Set the network interface number as scope */

766

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

693

to.in6.sin6_scope_id = (uint32_t)if_index;

767

694

}

768

695

} else {

769

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

696

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

697

-Wconversion and

698

-Wunreachable-code */

770

699

}

771

700

772

701

if(quit_now){

780

709

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

781

710

perror_plus("if_indextoname");

782

711

} else {

783

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

784

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

712

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

713

ip, interface, port);

785

714

}

786

715

} else {

787

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

788

ip, (uintmax_t)port);

716

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

717

port);

789

718

}

790

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

721

const char *pcret;

792

722

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

723

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

724

sizeof(addrstr));

797

725

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

726

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

727

sizeof(addrstr));

802

728

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

809

735

}

810

736

}

811

737

815

741

}

816

742

817

743

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

744

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

820

745

} else {

821

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

822

sizeof(struct sockaddr_in));

746

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

823

747

}

824

748

if(ret < 0){

825

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

749

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

826

750

int e = errno;

827

751

perror_plus("connect");

828

752

errno = e;

840

764

while(true){

841

765

size_t out_size = strlen(out);

842

766

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

843

out_size - written));

767

out_size - written));

844

768

if(ret == -1){

845

769

int e = errno;

846

770

perror_plus("write");

866

790

}

867

791

868

792

if(debug){

869

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

793

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

870

794

}

871

795

872

796

if(quit_now){

874

798

goto mandos_end;

875

799

}

876

800

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

803

883

804

if(quit_now){

884

805

errno = EINTR;

895

816

896

817

if(ret != GNUTLS_E_SUCCESS){

897

818

if(debug){

898

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

819

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

899

820

gnutls_perror(ret);

900

821

}

901

822

errno = EPROTO;

905

826

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

906

827

907

828

if(debug){

908

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

909

" %s\n", ip);

829

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

830

ip);

910

831

}

911

832

912

833

while(true){

917

838

}

918

839

919

840

buffer_capacity = incbuffer(&buffer, buffer_length,

920

buffer_capacity);

841

buffer_capacity);

921

842

if(buffer_capacity == 0){

922

843

int e = errno;

923

844

perror_plus("incbuffer");

950

871

}

951

872

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

952

873

if(ret < 0){

953

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

954

"***\n");

874

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

955

875

gnutls_perror(ret);

956

876

errno = EPROTO;

957

877

goto mandos_end;

958

878

}

959

879

break;

960

880

default:

961

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

962

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

963

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

964

884

errno = EIO;

965

885

goto mandos_end;

970

890

}

971

891

972

892

if(debug){

973

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

893

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

974

894

}

975

895

976

896

if(quit_now){

988

908

989

909

if(buffer_length > 0){

990

910

ssize_t decrypted_buffer_size;

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

993

914

if(decrypted_buffer_size >= 0){

994

915

995

916

written = 0;

1005

926

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

1006

927

int e = errno;

1007

928

if(debug){

1008

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

1009

strerror(errno));

929

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

930

strerror(errno));

1010

931

}

1011

932

errno = e;

1012

933

goto mandos_end;

1043

964

return retval;

1044

965

}

1045

966

1046

__attribute__((nonnull))

1047

967

static void resolve_callback(AvahiSServiceResolver *r,

1048

968

AvahiIfIndex interface,

1049

969

AvahiProtocol proto,

1057

977

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

979

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1064

982

1065

983

/* Called whenever a service has been resolved successfully or

1066

984

timed out */

1072

990

switch(event){

1073

991

default:

1074

992

case AVAHI_RESOLVER_FAILURE:

1075

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

1076

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

1077

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1080

996

break;

1081

997

1082

998

case AVAHI_RESOLVER_FOUND:

1084

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1085

1001

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

1086

1002

if(debug){

1087

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

1088

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

1089

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

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1090

1006

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1095

1009

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1010

avahi_simple_poll_quit(mc.simple_poll);

1097

1011

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1101

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

1102

" list\n", name);

1103

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1104

1014

}

1105

1015

}

1106

1016

}

1116

1026

const char *domain,

1117

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1028

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1123

1031

1124

1032

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

1125

1033

is removed from the LAN */

1132

1040

default:

1133

1041

case AVAHI_BROWSER_FAILURE:

1134

1042

1135

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1139

1046

return;

1140

1047

1141

1048

case AVAHI_BROWSER_NEW:

1144

1051

the callback function is called the Avahi server will free the

1145

1052

resolver for us. */

1146

1053

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1151

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

1152

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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

1155

1059

break;

1156

1060

1157

1061

case AVAHI_BROWSER_REMOVE:

1160

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1161

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1162

1066

if(debug){

1163

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

1164

" searching...\n");

1067

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

1165

1068

}

1166

1069

break;

1167

1070

}

1176

1079

signal_received = sig;

1177

1080

int old_errno = errno;

1178

1081

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1181

1084

}

1182

1085

errno = old_errno;

1183

1086

}

1184

1087

1185

__attribute__((nonnull, warn_unused_result))

1186

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

1187

int ret;

1188

error_t ret_errno;

1189

1190

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

1191

if(s < 0){

1192

ret_errno = errno;

1193

perror_plus("socket");

1194

errno = ret_errno;

1195

return false;

1196

}

1197

strcpy(ifr->ifr_name, ifname);

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

if(ret == -1){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1200

1144

if(debug){

1201

ret_errno = errno;

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1145

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

1146

flagstring, if_entry->d_name);

1204

1147

}

1205

return false;

1148

free(flagstring);

1149

return 0;

1206

1150

}

1207

return true;

1208

}

1209

1210

__attribute__((nonnull, warn_unused_result))

1211

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

1212

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1213

1153

/* Reject the loopback device */

1214

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1215

1155

if(debug){

1216

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

1217

ifname);

1156

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

1157

if_entry->d_name);

1218

1158

}

1219

return false;

1159

return 0;

1220

1160

}

1221

1161

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

1222

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

1162

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

1223

1163

if(debug){

1224

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

1225

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

1164

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

1165

if_entry->d_name);

1226

1166

}

1227

return true;

1167

return 1;

1228

1168

}

1229

1169

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

1230

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

1170

if(not (flags & IFF_BROADCAST)){

1231

1171

if(debug){

1232

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1233

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

1172

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

1173

if_entry->d_name);

1234

1174

}

1235

return false;

1175

return 0;

1236

1176

}

1237

1177

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

1238

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1239

1179

if(debug){

1240

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

1241

ifname);

1180

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

1181

if_entry->d_name);

1242

1182

}

1243

return false;

1183

return 0;

1244

1184

}

1245

1246

1185

/* Accept this device */

1247

1186

if(debug){

1248

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

1249

}

1250

return true;

1251

}

1252

1253

/*

1254

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

1255

* corresponds to an acceptable network device.

1256

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

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

int good_interface(const struct dirent *if_entry){

1260

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

1261

return 0;

1262

}

1263

1264

struct ifreq ifr;

1265

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

1266

if(debug){

1267

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

1268

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

1269

}

1270

return 0;

1271

}

1272

1273

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

1274

return 0;

1187

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

1188

if_entry->d_name);

1275

1189

}

1276

1190

return 1;

1277

1191

}

1278

1192

1279

/*

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1314

1193

int notdotentries(const struct dirent *direntry){

1315

1194

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

1316

1195

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

1322

1201

return 1;

1323

1202

}

1324

1203

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1327

int runnable_hook(const struct dirent *direntry){

1328

int ret;

1329

size_t sret;

1330

struct stat st;

1331

1332

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

1333

/* Empty name? */

1334

return 0;

1335

}

1336

1337

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

1338

"abcdefghijklmnopqrstuvwxyz"

1339

"0123456789"

1340

"_.-");

1341

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

1342

/* Contains non-allowed characters */

1343

if(debug){

1344

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

1345

direntry->d_name);

1346

}

1347

return 0;

1348

}

1349

1350

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

1351

if(ret == -1){

1352

if(debug){

1353

perror_plus("Could not stat hook");

1354

}

1355

return 0;

1356

}

1357

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

1358

/* Not a regular file */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

return 0;

1364

}

1365

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

1366

/* Not executable */

1367

if(debug){

1368

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

1369

direntry->d_name);

1370

}

1371

return 0;

1372

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

return 1;

1378

}

1379

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1205

int ret;

1384

1206

struct timespec now;

1385

1207

struct timespec waited_time;

1386

1208

intmax_t block_time;

1387

1209

1388

1210

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1391

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

1392

" No timeout!\n");

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

"Wait until first server is found. No timeout!\n");

1393

1215

}

1394

1216

ret = avahi_simple_poll_iterate(s, -1);

1395

1217

} else {

1396

if(debug){

1397

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

1398

" it, or wait\n");

1218

if (debug){

1219

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

1220

" or wait\n");

1399

1221

}

1400

1222

/* the current time */

1401

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1406

1228

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

1407

1229

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

1408

1230

waited_time.tv_sec = (now.tv_sec

1409

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

1231

- mc.current_server->last_seen.tv_sec);

1410

1232

waited_time.tv_nsec = (now.tv_nsec

1411

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

1233

- mc.current_server->last_seen.tv_nsec);

1412

1234

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

1413

1235

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

1414

1236

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

1416

1238

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

1417

1239

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

1418

1240

1419

if(debug){

1420

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

1421

block_time);

1241

if (debug){

1242

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

1422

1243

}

1423

1244

1424

1245

if(block_time <= 0){

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1429

1250

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1251

avahi_simple_poll_quit(mc.simple_poll);

1431

1252

return 0;

1432

1253

}

1433

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1255

&mc.current_server->last_seen);

1435

1256

if(ret == -1){

1436

1257

perror_plus("clock_gettime");

1437

1258

return -1;

1438

1259

}

1439

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

1260

mc.current_server = mc.current_server->next;

1440

1261

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

1441

1262

servers, but don't block */

1442

1263

}

1444

1265

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

1445

1266

}

1446

1267

if(ret != 0){

1447

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

1268

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

1448

1269

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

1449

1270

}

1450

1271

}

1451

1272

}

1452

1273

}

1453

1274

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

#ifndef O_CLOEXEC

1511

/*

1512

* Based on the example in the GNU LibC manual chapter 13.13 "File

1513

* Descriptor Flags".

1514

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1515

*/

1516

__attribute__((warn_unused_result))

1517

static int set_cloexec_flag(int fd){

1518

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1519

/* If reading the flags failed, return error indication now. */

1520

if(ret < 0){

1521

return ret;

1522

}

1523

/* Store modified flag word in the descriptor. */

1524

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1525

ret | FD_CLOEXEC));

1526

}

1527

#endif /* not O_CLOEXEC */

1528

1529

__attribute__((nonnull))

1530

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

1531

const float delay){

1532

struct dirent **direntries;

1533

if(hookdir_fd == -1){

1534

hookdir_fd = open(hookdir, O_RDONLY |

1535

#ifdef O_CLOEXEC

1536

O_CLOEXEC

1537

#else /* not O_CLOEXEC */

1538

0

1539

#endif /* not O_CLOEXEC */

1540

);

1541

if(hookdir_fd == -1){

1542

if(errno == ENOENT){

1543

if(debug){

1544

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

1545

" found\n", hookdir);

1546

}

1547

} else {

1548

perror_plus("open");

1549

}

1550

return;

1551

}

1552

#ifndef O_CLOEXEC

1553

if(set_cloexec_flag(hookdir_fd) < 0){

1554

perror_plus("set_cloexec_flag");

1555

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

1556

perror_plus("close");

1557

} else {

1558

hookdir_fd = -1;

1559

}

1560

return;

1561

}

1562

#endif /* not O_CLOEXEC */

1563

}

1564

#ifdef __GLIBC__

1565

#if __GLIBC_PREREQ(2, 15)

1566

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

1567

runnable_hook, alphasort);

1568

#else /* not __GLIBC_PREREQ(2, 15) */

1569

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

1570

alphasort);

1571

#endif /* not __GLIBC_PREREQ(2, 15) */

1572

#else /* not __GLIBC__ */

1573

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

1574

alphasort);

1575

#endif /* not __GLIBC__ */

1576

if(numhooks == -1){

1577

perror_plus("scandir");

1578

return;

1579

}

1580

struct dirent *direntry;

1581

int ret;

1582

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

1583

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

1584

direntry = direntries[i];

1585

if(debug){

1586

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

1587

direntry->d_name);

1588

}

1589

pid_t hook_pid = fork();

1590

if(hook_pid == 0){

1591

/* Child */

1592

/* Raise privileges */

1593

if(raise_privileges_permanently() != 0){

1594

perror_plus("Failed to raise privileges");

1595

_exit(EX_NOPERM);

1596

}

1597

/* Set group */

1598

errno = 0;

1599

ret = setgid(0);

1600

if(ret == -1){

1601

perror_plus("setgid");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Reset supplementary groups */

1605

errno = 0;

1606

ret = setgroups(0, NULL);

1607

if(ret == -1){

1608

perror_plus("setgroups");

1609

_exit(EX_NOPERM);

1610

}

1611

ret = dup2(devnull, STDIN_FILENO);

1612

if(ret == -1){

1613

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

1614

_exit(EX_OSERR);

1615

}

1616

ret = close(devnull);

1617

if(ret == -1){

1618

perror_plus("close");

1619

_exit(EX_OSERR);

1620

}

1621

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1622

if(ret == -1){

1623

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

1624

_exit(EX_OSERR);

1625

}

1626

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

1627

if(ret == -1){

1628

perror_plus("setenv");

1629

_exit(EX_OSERR);

1630

}

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

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

1637

if(ret == -1){

1638

perror_plus("setenv");

1639

_exit(EX_OSERR);

1640

}

1641

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

1642

if(ret == -1){

1643

perror_plus("setenv");

1644

_exit(EX_OSERR);

1645

}

1646

char *delaystring;

1647

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

1648

if(ret == -1){

1649

perror_plus("asprintf");

1650

_exit(EX_OSERR);

1651

}

1652

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

1653

if(ret == -1){

1654

free(delaystring);

1655

perror_plus("setenv");

1656

_exit(EX_OSERR);

1657

}

1658

free(delaystring);

1659

if(connect_to != NULL){

1660

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

1661

if(ret == -1){

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

}

1666

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

1667

{ direntry->d_name, NULL }, environ) == -1){

1668

perror_plus("fexecve");

1669

_exit(EXIT_FAILURE);

1670

}

1671

} else {

1672

int status;

1673

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

1674

perror_plus("waitpid");

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

continue;

1683

}

1684

} else if(WIFSIGNALED(status)){

1685

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

1686

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

1687

WTERMSIG(status));

1688

continue;

1689

} else {

1690

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

1691

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

1692

continue;

1693

}

1694

}

1695

if(debug){

1696

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

1697

direntry->d_name);

1698

}

1699

}

1700

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

1701

perror_plus("close");

1702

} else {

1703

hookdir_fd = -1;

1704

}

1705

close(devnull);

1706

}

1707

1708

__attribute__((nonnull, warn_unused_result))

1709

error_t bring_up_interface(const char *const interface,

1710

const float delay){

1711

error_t old_errno = errno;

1712

int ret;

1713

struct ifreq network;

1714

unsigned int if_index = if_nametoindex(interface);

1715

if(if_index == 0){

1716

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

1717

errno = old_errno;

1718

return ENXIO;

1719

}

1720

1721

if(quit_now){

1722

errno = old_errno;

1723

return EINTR;

1724

}

1725

1726

if(not interface_is_up(interface)){

1727

error_t ret_errno = 0, ioctl_errno = 0;

1728

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

1729

ret_errno = errno;

1730

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

1731

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

1732

errno = old_errno;

1733

return ret_errno;

1734

}

1735

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

1736

1737

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

1738

if(sd == -1){

1739

ret_errno = errno;

1740

perror_plus("socket");

1741

errno = old_errno;

1742

return ret_errno;

1743

}

1744

1745

if(quit_now){

1746

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

1747

if(ret == -1){

1748

perror_plus("close");

1749

}

1750

errno = old_errno;

1751

return EINTR;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise privileges */

1760

ret_errno = raise_privileges();

1761

if(ret_errno != 0){

1762

perror_plus("Failed to raise privileges");

1763

}

1764

1765

#ifdef __linux__

1766

int ret_linux;

1767

bool restore_loglevel = false;

1768

if(ret_errno == 0){

1769

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1770

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

1771

ret_linux = klogctl(8, NULL, 5);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

} else {

1775

restore_loglevel = true;

1776

}

1777

}

1778

#endif /* __linux__ */

1779

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

1780

ioctl_errno = errno;

1781

#ifdef __linux__

1782

if(restore_loglevel){

1783

ret_linux = klogctl(7, NULL, 0);

1784

if(ret_linux == -1){

1785

perror_plus("klogctl");

1786

}

1787

}

1788

#endif /* __linux__ */

1789

1790

/* If raise_privileges() succeeded above */

1791

if(ret_errno == 0){

1792

/* Lower privileges */

1793

ret_errno = lower_privileges();

1794

if(ret_errno != 0){

1795

errno = ret_errno;

1796

perror_plus("Failed to lower privileges");

1797

}

1798

}

1799

1800

/* Close the socket */

1801

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

1802

if(ret == -1){

1803

perror_plus("close");

1804

}

1805

1806

if(ret_setflags == -1){

1807

errno = ioctl_errno;

1808

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1809

errno = old_errno;

1810

return ioctl_errno;

1811

}

1812

} else if(debug){

1813

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

1814

interface);

1815

}

1816

1817

/* Sleep checking until interface is running.

1818

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

1819

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

1820

if(interface_is_running(interface)){

1821

break;

1822

}

1823

struct timespec sleeptime = { .tv_nsec = 250000000 };

1824

ret = nanosleep(&sleeptime, NULL);

1825

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

1826

perror_plus("nanosleep");

1827

}

1828

}

1829

1830

errno = old_errno;

1831

return 0;

1832

}

1833

1834

__attribute__((nonnull, warn_unused_result))

1835

error_t take_down_interface(const char *const interface){

1836

error_t old_errno = errno;

1837

struct ifreq network;

1838

unsigned int if_index = if_nametoindex(interface);

1839

if(if_index == 0){

1840

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

1841

errno = old_errno;

1842

return ENXIO;

1843

}

1844

if(interface_is_up(interface)){

1845

error_t ret_errno = 0, ioctl_errno = 0;

1846

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

1847

ret_errno = errno;

1848

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

1849

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

1850

errno = old_errno;

1851

return ret_errno;

1852

}

1853

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

1854

1855

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

1856

if(sd == -1){

1857

ret_errno = errno;

1858

perror_plus("socket");

1859

errno = old_errno;

1860

return ret_errno;

1861

}

1862

1863

if(debug){

1864

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

1865

interface);

1866

}

1867

1868

/* Raise privileges */

1869

ret_errno = raise_privileges();

1870

if(ret_errno != 0){

1871

perror_plus("Failed to raise privileges");

1872

}

1873

1874

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

1875

ioctl_errno = errno;

1876

1877

/* If raise_privileges() succeeded above */

1878

if(ret_errno == 0){

1879

/* Lower privileges */

1880

ret_errno = lower_privileges();

1881

if(ret_errno != 0){

1882

errno = ret_errno;

1883

perror_plus("Failed to lower privileges");

1884

}

1885

}

1886

1887

/* Close the socket */

1888

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

1889

if(ret == -1){

1890

perror_plus("close");

1891

}

1892

1893

if(ret_setflags == -1){

1894

errno = ioctl_errno;

1895

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1896

errno = old_errno;

1897

return ioctl_errno;

1898

}

1899

} else if(debug){

1900

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

1901

interface);

1902

}

1903

1904

errno = old_errno;

1905

return 0;

1906

}

1907

1908

1275

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

1909

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

1910

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

1911

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

1912

.interfaces = NULL, .interfaces_size = 0 };

1913

1276

AvahiSServiceBrowser *sb = NULL;

1914

error_t ret_errno;

1277

int error;

1915

1278

int ret;

1916

1279

intmax_t tmpmax;

1917

1280

char *tmp;

1918

1281

int exitcode = EXIT_SUCCESS;

1919

char *interfaces_to_take_down = NULL;

1920

size_t interfaces_to_take_down_size = 0;

1921

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

1922

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

1923

char *tempdir = NULL;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1288

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

1289

bool tempdir_created = false;

1924

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1925

1291

const char *seckey = PATHDIR "/" SECKEY;

1926

1292

const char *pubkey = PATHDIR "/" PUBKEY;

1927

char *interfaces_hooks = NULL;

1928

1293

1929

1294

bool gnutls_initialized = false;

1930

1295

bool gpgme_initialized = false;

1992

1357

.group = 2 },

1993

1358

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

1994

1359

.arg = "SECONDS",

1995

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

1996

.group = 2 },

1997

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

1998

.arg = "DIR",

1999

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

1360

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

2000

1361

.group = 2 },

2001

1362

/*

2002

1363

* These reproduce what we would get without ARGP_NO_HELP

2021

1382

connect_to = arg;

2022

1383

break;

2023

1384

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

2024

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

2025

arg, (int)',');

2026

if(ret_errno != 0){

2027

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

2028

}

1385

interface = arg;

2029

1386

break;

2030

1387

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

2031

1388

seckey = arg;

2060

1417

argp_error(state, "Bad retry interval");

2061

1418

}

2062

1419

break;

2063

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

2064

hookdir = arg;

2065

break;

2066

1420

/*

2067

1421

* These reproduce what we would get without ARGP_NO_HELP

2068

1422

*/

2074

1428

argp_state_help(state, state->out_stream,

2075

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2076

1430

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

2077

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

1431

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

2078

1432

exit(argp_err_exit_status);

2079

1433

break;

2080

1434

default:

2107

1461

{

2108

1462

/* Work around Debian bug #633582:

2109

1463

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

2110

2111

/* Re-raise privileges */

2112

ret_errno = raise_privileges();

2113

if(ret_errno != 0){

2114

errno = ret_errno;

2115

perror_plus("Failed to raise privileges");

2116

} else {

2117

struct stat st;

2118

2119

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

2120

int seckey_fd = open(seckey, O_RDONLY);

2121

if(seckey_fd == -1){

2122

perror_plus("open");

2123

} else {

2124

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

2125

if(ret == -1){

2126

perror_plus("fstat");

2127

} else {

2128

if(S_ISREG(st.st_mode)

2129

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

2130

ret = fchown(seckey_fd, uid, gid);

2131

if(ret == -1){

2132

perror_plus("fchown");

2133

}

2134

}

2135

}

2136

TEMP_FAILURE_RETRY(close(seckey_fd));

2137

}

2138

}

2139

2140

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

2141

int pubkey_fd = open(pubkey, O_RDONLY);

2142

if(pubkey_fd == -1){

2143

perror_plus("open");

2144

} else {

2145

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

2146

if(ret == -1){

2147

perror_plus("fstat");

2148

} else {

2149

if(S_ISREG(st.st_mode)

2150

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

2151

ret = fchown(pubkey_fd, uid, gid);

2152

if(ret == -1){

2153

perror_plus("fchown");

2154

}

2155

}

2156

}

2157

TEMP_FAILURE_RETRY(close(pubkey_fd));

2158

}

2159

}

2160

2161

/* Lower privileges */

2162

ret_errno = lower_privileges();

2163

if(ret_errno != 0){

2164

errno = ret_errno;

2165

perror_plus("Failed to lower privileges");

2166

}

2167

}

2168

}

2169

2170

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

2171

{

2172

char *interface = NULL;

2173

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

2174

interface))){

2175

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

2176

and if_nametoindex(interface) == 0){

2177

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

2178

fprintf_plus(stderr, "Not using nonexisting interface"

2179

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

2180

}

2181

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

2182

interface = NULL;

2183

}

2184

}

2185

}

2186

2187

/* Run network hooks */

2188

{

2189

if(mc.interfaces != NULL){

2190

interfaces_hooks = malloc(mc.interfaces_size);

2191

if(interfaces_hooks == NULL){

2192

perror_plus("malloc");

2193

goto end;

2194

}

2195

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

2196

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

2197

}

2198

run_network_hooks("start", interfaces_hooks != NULL ?

2199

interfaces_hooks : "", delay);

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

2200

1519

}

2201

1520

2202

1521

if(not debug){

2203

1522

avahi_set_log_function(empty_log);

2204

1523

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

2205

1549

2206

1550

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

2207

1551

from the signal handler */

2208

1552

/* Initialize the pseudo-RNG for Avahi */

2209

1553

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

2210

simple_poll = avahi_simple_poll_new();

2211

if(simple_poll == NULL){

2212

fprintf_plus(stderr,

2213

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

1554

mc.simple_poll = avahi_simple_poll_new();

1555

if(mc.simple_poll == NULL){

1556

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

2214

1557

exitcode = EX_UNAVAILABLE;

2215

1558

goto end;

2216

1559

}

2278

1621

}

2279

1622

}

2280

1623

2281

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

2282

if(mc.interfaces == NULL){

2283

struct dirent **direntries;

2284

/* Look for any good interfaces */

2285

ret = scandir(sys_class_net, &direntries, good_interface,

2286

alphasort);

2287

if(ret >= 1){

2288

/* Add all found interfaces to interfaces list */

2289

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

2290

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

2291

direntries[i]->d_name);

2292

if(ret_errno != 0){

2293

errno = ret_errno;

2294

perror_plus("argz_add");

2295

continue;

2296

}

2297

if(debug){

2298

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

2299

direntries[i]->d_name);

2300

}

2301

}

2302

free(direntries);

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

1709

}

1710

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

break;

1729

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

2303

1760

} else {

2304

free(direntries);

2305

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

2306

exitcode = EXIT_FAILURE;

2307

goto end;

2308

}

2309

}

2310

2311

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

2312

{

2313

char *interface = NULL;

2314

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

2315

interface))){

2316

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

2317

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

2318

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

2319

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

2320

interface);

2321

interface = NULL;

2322

while((interface = argz_next(mc.interfaces,

2323

mc.interfaces_size, interface))){

2324

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

2325

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

2326

interface);

2327

interface = NULL;

2328

}

2329

}

2330

break;

2331

}

2332

bool interface_was_up = interface_is_up(interface);

2333

errno = bring_up_interface(interface, delay);

2334

if(not interface_was_up){

2335

if(errno != 0){

2336

perror_plus("Failed to bring up interface");

2337

} else {

2338

errno = argz_add(&interfaces_to_take_down,

2339

&interfaces_to_take_down_size,

2340

interface);

2341

if(errno != 0){

2342

perror_plus("argz_add");

2343

}

2344

}

2345

}

2346

}

2347

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

2348

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

2349

}

2350

}

2351

2352

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

2353

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

2354

if(debug){

2355

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

2356

mc.interfaces);

2357

}

2358

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

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

2359

1767

}

2360

1768

2361

1769

if(quit_now){

2362

1770

goto end;

2363

1771

}

2364

1772

2365

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

1773

ret = init_gnutls_global(pubkey, seckey);

2366

1774

if(ret == -1){

2367

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

1775

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

2368

1776

exitcode = EX_UNAVAILABLE;

2369

1777

goto end;

2370

1778

} else {

2375

1783

goto end;

2376

1784

}

2377

1785

2378

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

2379

tempdir = mkdtemp(run_tempdir);

2380

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

2381

if(debug){

2382

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

2383

run_tempdir, old_tempdir);

2384

}

2385

tempdir = mkdtemp(old_tempdir);

2386

}

2387

if(tempdir == NULL){

1786

if(mkdtemp(tempdir) == NULL){

2388

1787

perror_plus("mkdtemp");

2389

1788

goto end;

2390

1789

}

1790

tempdir_created = true;

2391

1791

2392

1792

if(quit_now){

2393

1793

goto end;

2394

1794

}

2395

1795

2396

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

2397

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

1796

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

1797

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

2398

1798

exitcode = EX_UNAVAILABLE;

2399

1799

goto end;

2400

1800

} else {

2409

1809

/* Connect directly, do not use Zeroconf */

2410

1810

/* (Mainly meant for debugging) */

2411

1811

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

2412

2413

1812

if(address == NULL){

2414

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

1813

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

2415

1814

exitcode = EX_USAGE;

2416

1815

goto end;

2417

1816

}

2420

1819

goto end;

2421

1820

}

2422

1821

2423

in_port_t port;

1822

uint16_t port;

2424

1823

errno = 0;

2425

1824

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

2426

1825

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

2427

or tmpmax != (in_port_t)tmpmax){

2428

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2429

1828

exitcode = EX_USAGE;

2430

1829

goto end;

2431

1830

}

2432

1831

2433

1832

if(quit_now){

2434

1833

goto end;

2435

1834

}

2436

1835

2437

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2438

1837

*address = '\0';

2439

1838

/* Colon in address indicates IPv6 */

2440

1839

int af;

2456

1855

}

2457

1856

2458

1857

while(not quit_now){

2459

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

2460

&mc);

1858

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

2461

1859

if(quit_now or ret == 0){

2462

1860

break;

2463

1861

}

2464

1862

if(debug){

2465

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

2466

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2467

1865

}

2468

sleep((unsigned int)retry_interval);

1866

sleep((int)retry_interval);

2469

1867

}

2470

1868

2471

if(not quit_now){

1869

if (not quit_now){

2472

1870

exitcode = EXIT_SUCCESS;

2473

1871

}

2474

1872

2475

1873

goto end;

2476

1874

}

2477

1875

2489

1887

config.publish_domain = 0;

2490

1888

2491

1889

/* Allocate a new server */

2492

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2493

&config, NULL, NULL, &ret_errno);

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2494

1893

2495

1894

/* Free the Avahi configuration data */

2496

1895

avahi_server_config_free(&config);

2498

1897

2499

1898

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

2500

1899

if(mc.server == NULL){

2501

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

2502

avahi_strerror(ret_errno));

1900

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

1901

avahi_strerror(error));

2503

1902

exitcode = EX_UNAVAILABLE;

2504

1903

goto end;

2505

1904

}

2511

1910

/* Create the Avahi service browser */

2512

1911

sb = avahi_s_service_browser_new(mc.server, if_index,

2513

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2514

NULL, 0, browse_callback,

2515

(void *)&mc);

1913

NULL, 0, browse_callback, NULL);

2516

1914

if(sb == NULL){

2517

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

2518

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2519

1917

exitcode = EX_UNAVAILABLE;

2520

1918

goto end;

2521

1919

}

2527

1925

/* Run the main loop */

2528

1926

2529

1927

if(debug){

2530

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

1928

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

2531

1929

}

2532

2533

ret = avahi_loop_with_timeout(simple_poll,

2534

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

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2535

1933

if(debug){

2536

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

2537

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

1934

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

1935

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

2538

1936

}

2539

1937

2540

1938

end:

2541

1939

2542

1940

if(debug){

2543

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

1941

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

2544

1942

}

2545

1943

2546

1944

/* Cleanup things */

2547

free(mc.interfaces);

2548

2549

1945

if(sb != NULL)

2550

1946

avahi_s_service_browser_free(sb);

2551

1947

2552

1948

if(mc.server != NULL)

2553

1949

avahi_server_free(mc.server);

2554

1950

2555

if(simple_poll != NULL)

2556

avahi_simple_poll_free(simple_poll);

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2557

1953

2558

1954

if(gnutls_initialized){

2559

1955

gnutls_certificate_free_credentials(mc.cred);

2564

1960

if(gpgme_initialized){

2565

1961

gpgme_release(mc.ctx);

2566

1962

}

2567

1963

2568

1964

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

2569

1965

has seen */

2570

1966

if(mc.current_server != NULL){

2576

1972

}

2577

1973

}

2578

1974

2579

/* Re-raise privileges */

2580

{

2581

ret_errno = raise_privileges();

2582

if(ret_errno != 0){

2583

perror_plus("Failed to raise privileges");

2584

} else {

2585

2586

/* Run network hooks */

2587

run_network_hooks("stop", interfaces_hooks != NULL ?

2588

interfaces_hooks : "", delay);

2589

2590

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

2591

{

2592

char *interface = NULL;

2593

while((interface=argz_next(interfaces_to_take_down,

2594

interfaces_to_take_down_size,

2595

interface))){

2596

ret_errno = take_down_interface(interface);

2597

if(ret_errno != 0){

2598

errno = ret_errno;

2599

perror_plus("Failed to take down interface");

2600

}

2601

}

2602

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

2603

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

2604

" down\n");

2605

}

2606

}

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

2607

1982

}

2608

2609

ret_errno = lower_privileges_permanently();

2610

if(ret_errno != 0){

2611

perror_plus("Failed to lower privileges permanently");

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2612

2004

}

2613

2005

}

2614

2006

2615

free(interfaces_to_take_down);

2616

free(interfaces_hooks);

2617

2618

2007

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

2619

if(tempdir != NULL){

2008

if(tempdir_created){

2620

2009

struct dirent **direntries = NULL;

2621

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));

2622

if(tempdir_fd == -1){

2623

perror_plus("open");

2624

} else {

2625

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

2626

alphasort);

2627

if(numentries > 0){

2628

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

2629

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2630

if(ret == -1){

2631

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2632

" \"%s\", 0): %s\n", tempdir,

2633

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

2634

}

2635

}

2636

2637

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

2638

free(direntries);

2639

if(numentries == -1){

2640

perror_plus("scandir");

2641

}

2642

ret = rmdir(tempdir);

2643

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

2644

perror_plus("rmdir");

2645

}

2010

struct dirent *direntry = NULL;

2011

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

2012

alphasort);

2013

if (numentries > 0){

2014

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

2015

direntry = direntries[i];

2016

char *fullname = NULL;

2017

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

2018

direntry->d_name);

2019

if(ret < 0){

2020

perror_plus("asprintf");

2021

continue;

2022

}

2023

ret = remove(fullname);

2024

if(ret == -1){

2025

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

2026

strerror(errno));

2027

}

2028

free(fullname);

2646

2029

}

2647

TEMP_FAILURE_RETRY(close(tempdir_fd));

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

2036

}

2037

ret = rmdir(tempdir);

2038

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

2039

perror_plus("rmdir");

2648

2040

}

2649

2041

}

2650

2042