/mandos/trunk : revision 237.4.31

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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 file is part of Mandos.

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*

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* Mandos is free software: you can redistribute it and/or modify it

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* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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*

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

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

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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* General Public License for more details.

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*

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* You should have received a copy of the GNU General Public License

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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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* along with this program. If not, see

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

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*

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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

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asprintf(), strncpy(), strsignal()

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*/

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

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

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

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

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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

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

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program_invocation_short_name */

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

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

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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(), _exit() */

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

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

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

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argp_state, struct argp,

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#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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gnutls_*

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init_gnutls_session(),

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GNUTLS_* */

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#if GNUTLS_VERSION_NUMBER < 0x030600

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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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#elif GNUTLS_VERSION_NUMBER >= 0x030606

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#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,

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GNUTLS_PKCS_PLAIN,

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GNUTLS_PKCS_NULL_PASSWORD */

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#endif

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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 TLS_PRIVKEY "tls-privkey.pem"

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#define TLS_PUBKEY "tls-pubkey.pem"

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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 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;

184

size_t interfaces_size;

185

160

} 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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perror(print_text);

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}

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

180

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

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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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184

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

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program_invocation_short_name));

209

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

187

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

210

188

}

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189

212

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/*

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

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* "buffer_length" is how much is already used.

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194

*/

217

__attribute__((nonnull, warn_unused_result))

218

195

size_t incbuffer(char **buffer, size_t buffer_length,

219

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size_t buffer_capacity){

220

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

221

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

198

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

199

if(buffer == NULL){

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return 0;

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201

}

229

*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

231

203

}

232

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return buffer_capacity;

233

205

}

234

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235

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

236

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

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int af){

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210

int ret;

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211

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

241

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if(new_server == NULL){

248

219

.af = af };

249

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if(new_server->ip == NULL){

250

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perror_plus("strdup");

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free(new_server);

252

return false;

253

}

254

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

255

if(ret == -1){

256

perror_plus("clock_gettime");

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#ifdef __GNUC__

258

#pragma GCC diagnostic push

259

#pragma GCC diagnostic ignored "-Wcast-qual"

260

#endif

261

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

262

#ifdef __GNUC__

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#pragma GCC diagnostic pop

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#endif

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free(new_server);

266

222

return false;

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223

}

268

224

/* Special case of first server */

269

if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

271

227

new_server->prev = new_server;

272

*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 */

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} else {

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

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

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if(ret == -1){

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perror_plus("clock_gettime");

239

return false;

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240

}

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return true;

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}

282

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

284

__attribute__((warn_unused_result))

285

int raise_privileges(void){

286

int old_errno = errno;

287

int ret = 0;

288

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

289

ret = errno;

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}

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errno = old_errno;

292

return ret;

293

}

294

295

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

296

__attribute__((warn_unused_result))

297

int raise_privileges_permanently(void){

298

int old_errno = errno;

299

int ret = raise_privileges();

300

if(ret != 0){

301

errno = old_errno;

302

return ret;

303

}

304

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

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ret = errno;

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}

307

errno = old_errno;

308

return ret;

309

}

310

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

312

__attribute__((warn_unused_result))

313

int lower_privileges(void){

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int old_errno = errno;

315

int ret = 0;

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

317

ret = errno;

318

}

319

errno = old_errno;

320

return ret;

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}

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/* Lower privileges permanently */

324

__attribute__((warn_unused_result))

325

int lower_privileges_permanently(void){

326

int old_errno = errno;

327

int ret = 0;

328

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

329

ret = errno;

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}

331

errno = old_errno;

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return ret;

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}

334

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/*

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* Initialize GPGME.

337

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*/

338

__attribute__((nonnull, warn_unused_result))

339

static bool init_gpgme(const char * const seckey,

340

const char * const pubkey,

341

const char * const tempdir,

342

mandos_context *mc){

247

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

248

const char *tempdir){

343

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gpgme_error_t rc;

344

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gpgme_engine_info_t engine_info;

345

251

252

346

253

/*

347

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

348

255

*/

349

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

350

257

int ret;

351

258

int fd;

352

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gpgme_data_t pgp_data;

357

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return false;

358

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}

359

266

360

/* Workaround for systems without a real-time clock; see also

361

Debian bug #894495: <https://bugs.debian.org/894495> */

362

do {

363

{

364

time_t currtime = time(NULL);

365

if(currtime != (time_t)-1){

366

struct tm tm;

367

if(gmtime_r(&currtime, &tm) == NULL) {

368

perror_plus("gmtime_r");

369

break;

370

}

371

if(tm.tm_year != 70 or tm.tm_mon != 0){

372

break;

373

}

374

if(debug){

375

fprintf_plus(stderr, "System clock is January 1970");

376

}

377

} else {

378

if(debug){

379

fprintf_plus(stderr, "System clock is invalid");

380

}

381

}

382

}

383

struct stat keystat;

384

ret = fstat(fd, &keystat);

385

if(ret != 0){

386

perror_plus("fstat");

387

break;

388

}

389

ret = raise_privileges();

390

if(ret != 0){

391

errno = ret;

392

perror_plus("Failed to raise privileges");

393

break;

394

}

395

if(debug){

396

fprintf_plus(stderr,

397

"Setting system clock to key file mtime");

398

}

399

time_t keytime = keystat.st_mtim.tv_sec;

400

if(stime(&keytime) != 0){

401

perror_plus("stime");

402

}

403

ret = lower_privileges();

404

if(ret != 0){

405

errno = ret;

406

perror_plus("Failed to lower privileges");

407

}

408

} while(false);

409

410

267

rc = gpgme_data_new_from_fd(&pgp_data, fd);

411

268

if(rc != GPG_ERR_NO_ERROR){

412

269

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

414

271

return false;

415

272

}

416

273

417

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

418

275

if(rc != GPG_ERR_NO_ERROR){

419

276

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

420

277

gpgme_strsource(rc), gpgme_strerror(rc));

421

278

return false;

422

279

}

423

{

424

gpgme_import_result_t import_result

425

= gpgme_op_import_result(mc->ctx);

426

if((import_result->imported < 1

427

or import_result->not_imported > 0)

428

and import_result->unchanged == 0){

429

fprintf_plus(stderr, "bad gpgme_op_import_results:\n");

430

fprintf_plus(stderr,

431

"The total number of considered keys: %d\n",

432

import_result->considered);

433

fprintf_plus(stderr,

434

"The number of keys without user ID: %d\n",

435

import_result->no_user_id);

436

fprintf_plus(stderr,

437

"The total number of imported keys: %d\n",

438

import_result->imported);

439

fprintf_plus(stderr, "The number of imported RSA keys: %d\n",

440

import_result->imported_rsa);

441

fprintf_plus(stderr, "The number of unchanged keys: %d\n",

442

import_result->unchanged);

443

fprintf_plus(stderr, "The number of new user IDs: %d\n",

444

import_result->new_user_ids);

445

fprintf_plus(stderr, "The number of new sub keys: %d\n",

446

import_result->new_sub_keys);

447

fprintf_plus(stderr, "The number of new signatures: %d\n",

448

import_result->new_signatures);

449

fprintf_plus(stderr, "The number of new revocations: %d\n",

450

import_result->new_revocations);

451

fprintf_plus(stderr,

452

"The total number of secret keys read: %d\n",

453

import_result->secret_read);

454

fprintf_plus(stderr,

455

"The number of imported secret keys: %d\n",

456

import_result->secret_imported);

457

fprintf_plus(stderr,

458

"The number of unchanged secret keys: %d\n",

459

import_result->secret_unchanged);

460

fprintf_plus(stderr, "The number of keys not imported: %d\n",

461

import_result->not_imported);

462

for(gpgme_import_status_t import_status

463

= import_result->imports;

464

import_status != NULL;

465

import_status = import_status->next){

466

fprintf_plus(stderr, "Import status for key: %s\n",

467

import_status->fpr);

468

if(import_status->result != GPG_ERR_NO_ERROR){

469

fprintf_plus(stderr, "Import result: %s: %s\n",

470

gpgme_strsource(import_status->result),

471

gpgme_strerror(import_status->result));

472

}

473

fprintf_plus(stderr, "Key status:\n");

474

fprintf_plus(stderr,

475

import_status->status & GPGME_IMPORT_NEW

476

? "The key was new.\n"

477

: "The key was not new.\n");

478

fprintf_plus(stderr,

479

import_status->status & GPGME_IMPORT_UID

480

? "The key contained new user IDs.\n"

481

: "The key did not contain new user IDs.\n");

482

fprintf_plus(stderr,

483

import_status->status & GPGME_IMPORT_SIG

484

? "The key contained new signatures.\n"

485

: "The key did not contain new signatures.\n");

486

fprintf_plus(stderr,

487

import_status->status & GPGME_IMPORT_SUBKEY

488

? "The key contained new sub keys.\n"

489

: "The key did not contain new sub keys.\n");

490

fprintf_plus(stderr,

491

import_status->status & GPGME_IMPORT_SECRET

492

? "The key contained a secret key.\n"

493

: "The key did not contain a secret key.\n");

494

}

495

return false;

496

}

497

}

498

280

499

ret = close(fd);

281

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

500

282

if(ret == -1){

501

283

perror_plus("close");

502

284

}

539

321

}

540

322

541

323

/* Create new GPGME "context" */

542

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

324

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

543

325

if(rc != GPG_ERR_NO_ERROR){

544

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

545

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

546

329

return false;

547

330

}

548

331

557

340

* Decrypt OpenPGP data.

558

341

* Returns -1 on error

559

342

*/

560

__attribute__((nonnull, warn_unused_result))

561

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

562

344

size_t crypto_size,

563

char **plaintext,

564

mandos_context *mc){

345

char **plaintext){

565

346

gpgme_data_t dh_crypto, dh_plain;

566

347

gpgme_error_t rc;

567

348

ssize_t ret;

584

365

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

585

366

rc = gpgme_data_new(&dh_plain);

586

367

if(rc != GPG_ERR_NO_ERROR){

587

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

368

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

369

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

588

370

gpgme_strsource(rc), gpgme_strerror(rc));

589

371

gpgme_data_release(dh_crypto);

590

372

return -1;

592

374

593

375

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

594

376

data buffer */

595

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

377

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

596

378

if(rc != GPG_ERR_NO_ERROR){

597

379

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

598

380

gpgme_strsource(rc), gpgme_strerror(rc));

599

381

plaintext_length = -1;

600

382

if(debug){

601

383

gpgme_decrypt_result_t result;

602

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

603

385

if(result == NULL){

604

386

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

605

387

} else {

606

if(result->unsupported_algorithm != NULL) {

607

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

608

result->unsupported_algorithm);

609

}

610

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

611

result->wrong_key_usage ? "Yes" : "No");

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

612

392

if(result->file_name != NULL){

613

393

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

614

394

}

615

616

for(gpgme_recipient_t r = result->recipients; r != NULL;

617

r = r->next){

395

gpgme_recipient_t recipient;

396

recipient = result->recipients;

397

while(recipient != NULL){

618

398

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

619

gpgme_pubkey_algo_name(r->pubkey_algo));

620

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

621

402

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

622

r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

405

recipient = recipient->next;

623

406

}

624

407

}

625

408

}

681

464

return plaintext_length;

682

465

}

683

466

684

__attribute__((warn_unused_result, const))

685

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

686

if(str == NULL)

687

return "(unknown)";

688

return str;

689

}

690

691

__attribute__((warn_unused_result))

692

static const char *safer_gnutls_strerror(int value){

693

const char *ret = gnutls_strerror(value);

694

return safe_string(ret);

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

695

473

}

696

474

697

475

/* GnuTLS log function callback */

698

__attribute__((nonnull))

699

476

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

700

477

const char* string){

701

478

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

702

479

}

703

480

704

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

705

481

static int init_gnutls_global(const char *pubkeyfilename,

706

const char *seckeyfilename,

707

const char *dhparamsfilename,

708

mandos_context *mc){

482

const char *seckeyfilename){

709

483

int ret;

710

484

711

485

if(debug){

712

486

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

713

487

}

714

488

489

ret = gnutls_global_init();

490

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

493

return -1;

494

}

495

715

496

if(debug){

716

497

/* "Use a log level over 10 to enable all debugging options."

717

498

* - GnuTLS manual

721

502

}

722

503

723

504

/* OpenPGP credentials */

724

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

725

506

if(ret != GNUTLS_E_SUCCESS){

726

507

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

727

508

safer_gnutls_strerror(ret));

509

gnutls_global_deinit();

728

510

return -1;

729

511

}

730

512

731

513

if(debug){

732

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

733

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

514

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

515

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

734

516

pubkeyfilename,

735

517

seckeyfilename);

736

518

}

737

519

738

#if GNUTLS_VERSION_NUMBER >= 0x030606

739

ret = gnutls_certificate_set_rawpk_key_file

740

(mc->cred, pubkeyfilename, seckeyfilename,

741

GNUTLS_X509_FMT_PEM, /* format */

742

NULL, /* pass */

743

/* key_usage */

744

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

745

NULL, /* names */

746

0, /* names_length */

747

/* privkey_flags */

748

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

749

0); /* pkcs11_flags */

750

#elif GNUTLS_VERSION_NUMBER < 0x030600

751

520

ret = gnutls_certificate_set_openpgp_key_file

752

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

753

522

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

756

#endif

757

523

if(ret != GNUTLS_E_SUCCESS){

758

524

fprintf_plus(stderr,

759

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

525

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

760

526

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

761

527

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

762

528

safer_gnutls_strerror(ret));

764

530

}

765

531

766

532

/* GnuTLS server initialization */

767

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

768

534

if(ret != GNUTLS_E_SUCCESS){

769

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

770

536

" initialization: %s\n",

771

537

safer_gnutls_strerror(ret));

772

538

goto globalfail;

773

539

}

774

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

775

if(dhparamsfilename != NULL){

776

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

777

do {

778

int dhpfile = open(dhparamsfilename, O_RDONLY);

779

if(dhpfile == -1){

780

perror_plus("open");

781

dhparamsfilename = NULL;

782

break;

783

}

784

size_t params_capacity = 0;

785

while(true){

786

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

787

(size_t)params.size,

788

(size_t)params_capacity);

789

if(params_capacity == 0){

790

perror_plus("incbuffer");

791

free(params.data);

792

params.data = NULL;

793

dhparamsfilename = NULL;

794

break;

795

}

796

ssize_t bytes_read = read(dhpfile,

797

params.data + params.size,

798

BUFFER_SIZE);

799

/* EOF */

800

if(bytes_read == 0){

801

break;

802

}

803

/* check bytes_read for failure */

804

if(bytes_read < 0){

805

perror_plus("read");

806

free(params.data);

807

params.data = NULL;

808

dhparamsfilename = NULL;

809

break;

810

}

811

params.size += (unsigned int)bytes_read;

812

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

817

if(params.data == NULL){

818

dhparamsfilename = NULL;

819

}

820

if(dhparamsfilename == NULL){

821

break;

822

}

823

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

824

GNUTLS_X509_FMT_PEM);

825

if(ret != GNUTLS_E_SUCCESS){

826

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

827

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

828

safer_gnutls_strerror(ret));

829

dhparamsfilename = NULL;

830

}

831

free(params.data);

832

} while(false);

833

}

834

if(dhparamsfilename == NULL){

835

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

837

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

838

/* Try to read the private key file */

839

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

840

do {

841

int secfile = open(seckeyfilename, O_RDONLY);

842

if(secfile == -1){

843

perror_plus("open");

844

break;

845

}

846

size_t buffer_capacity = 0;

847

while(true){

848

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

849

(size_t)buffer.size,

850

(size_t)buffer_capacity);

851

if(buffer_capacity == 0){

852

perror_plus("incbuffer");

853

free(buffer.data);

854

buffer.data = NULL;

855

break;

856

}

857

ssize_t bytes_read = read(secfile,

858

buffer.data + buffer.size,

859

BUFFER_SIZE);

860

/* EOF */

861

if(bytes_read == 0){

862

break;

863

}

864

/* check bytes_read for failure */

865

if(bytes_read < 0){

866

perror_plus("read");

867

free(buffer.data);

868

buffer.data = NULL;

869

break;

870

}

871

buffer.size += (unsigned int)bytes_read;

872

}

873

close(secfile);

874

} while(false);

875

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

876

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

877

if(buffer.data != NULL){

878

{

879

gnutls_openpgp_privkey_t privkey = NULL;

880

ret = gnutls_openpgp_privkey_init(&privkey);

881

if(ret != GNUTLS_E_SUCCESS){

882

fprintf_plus(stderr, "Error initializing OpenPGP key"

883

" structure: %s",

884

safer_gnutls_strerror(ret));

885

free(buffer.data);

886

buffer.data = NULL;

887

} else {

888

ret = gnutls_openpgp_privkey_import

889

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

890

if(ret != GNUTLS_E_SUCCESS){

891

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

892

safer_gnutls_strerror(ret));

893

privkey = NULL;

894

}

895

free(buffer.data);

896

buffer.data = NULL;

897

if(privkey != NULL){

898

/* Use private key to suggest an appropriate

899

sec_param */

900

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

901

gnutls_openpgp_privkey_deinit(privkey);

902

if(debug){

903

fprintf_plus(stderr, "This OpenPGP key implies using"

904

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

905

safe_string(gnutls_sec_param_get_name

906

(sec_param)));

907

}

908

}

909

}

910

}

911

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

912

/* Err on the side of caution */

913

sec_param = GNUTLS_SEC_PARAM_ULTRA;

914

if(debug){

915

fprintf_plus(stderr, "Falling back to security parameter"

916

" \"%s\"\n",

917

safe_string(gnutls_sec_param_get_name

918

(sec_param)));

919

}

920

}

921

}

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

923

if(uret != 0){

924

mc->dh_bits = uret;

925

if(debug){

926

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

927

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

928

safe_string(gnutls_sec_param_get_name

929

(sec_param)),

930

mc->dh_bits);

931

}

932

} else {

933

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

934

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

935

safe_string(gnutls_sec_param_get_name

936

(sec_param)),

937

safer_gnutls_strerror(ret));

938

goto globalfail;

939

}

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

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

944

mc->dh_bits);

945

}

946

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

947

if(ret != GNUTLS_E_SUCCESS){

948

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

949

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

950

safer_gnutls_strerror(ret));

951

goto globalfail;

952

}

953

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

954

}

955

}

540

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

541

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

544

goto globalfail;

545

}

546

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

956

548

957

549

return 0;

958

550

959

551

globalfail:

960

552

961

gnutls_certificate_free_credentials(mc->cred);

962

gnutls_dh_params_deinit(mc->dh_params);

553

gnutls_certificate_free_credentials(mc.cred);

554

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

963

556

return -1;

964

557

}

965

558

966

__attribute__((nonnull, warn_unused_result))

967

static int init_gnutls_session(gnutls_session_t *session,

968

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

969

560

int ret;

970

561

/* GnuTLS session creation */

971

562

do {

972

ret = gnutls_init(session, (GNUTLS_SERVER

973

#if GNUTLS_VERSION_NUMBER >= 0x030506

974

| GNUTLS_NO_TICKETS

975

#endif

976

#if GNUTLS_VERSION_NUMBER >= 0x030606

977

| GNUTLS_ENABLE_RAWPK

978

#endif

979

));

563

ret = gnutls_init(session, GNUTLS_SERVER);

980

564

if(quit_now){

981

565

return -1;

982

566

}

990

574

{

991

575

const char *err;

992

576

do {

993

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

577

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

994

578

if(quit_now){

995

579

gnutls_deinit(*session);

996

580

return -1;

1007

591

1008

592

do {

1009

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

1010

mc->cred);

594

mc.cred);

1011

595

if(quit_now){

1012

596

gnutls_deinit(*session);

1013

597

return -1;

1023

607

/* ignore client certificate if any. */

1024

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

1025

609

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

611

1026

612

return 0;

1027

613

}

1028

614

1030

616

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

1031

617

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

1032

618

1033

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

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool add_delete_local_route(const bool add,

1036

const char *address,

1037

AvahiIfIndex if_index){

1038

int ret;

1039

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

1040

char add_arg[] = "add";

1041

char delete_arg[] = "delete";

1042

char debug_flag[] = "--debug";

1043

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1044

if(pluginhelperdir == NULL){

1045

if(debug){

1046

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1047

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

1048

}

1049

return false;

1050

}

1051

1052

char interface[IF_NAMESIZE];

1053

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

1054

perror_plus("if_indextoname");

1055

return false;

1056

}

1057

1058

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

1059

if(devnull == -1){

1060

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

1061

return false;

1062

}

1063

pid_t pid = fork();

1064

if(pid == 0){

1065

/* Child */

1066

/* Raise privileges */

1067

errno = raise_privileges_permanently();

1068

if(errno != 0){

1069

perror_plus("Failed to raise privileges");

1070

/* _exit(EX_NOPERM); */

1071

} else {

1072

/* Set group */

1073

errno = 0;

1074

ret = setgid(0);

1075

if(ret == -1){

1076

perror_plus("setgid");

1077

_exit(EX_NOPERM);

1078

}

1079

/* Reset supplementary groups */

1080

errno = 0;

1081

ret = setgroups(0, NULL);

1082

if(ret == -1){

1083

perror_plus("setgroups");

1084

_exit(EX_NOPERM);

1085

}

1086

}

1087

ret = dup2(devnull, STDIN_FILENO);

1088

if(ret == -1){

1089

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

1090

_exit(EX_OSERR);

1091

}

1092

ret = close(devnull);

1093

if(ret == -1){

1094

perror_plus("close");

1095

_exit(EX_OSERR);

1096

}

1097

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1098

if(ret == -1){

1099

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

1100

_exit(EX_OSERR);

1101

}

1102

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

1103

O_RDONLY

1104

| O_DIRECTORY

1105

| O_PATH

1106

| O_CLOEXEC));

1107

if(helperdir_fd == -1){

1108

perror_plus("open");

1109

_exit(EX_UNAVAILABLE);

1110

}

1111

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

1112

helper, O_RDONLY));

1113

if(helper_fd == -1){

1114

perror_plus("openat");

1115

close(helperdir_fd);

1116

_exit(EX_UNAVAILABLE);

1117

}

1118

close(helperdir_fd);

1119

#ifdef __GNUC__

1120

#pragma GCC diagnostic push

1121

#pragma GCC diagnostic ignored "-Wcast-qual"

1122

#endif

1123

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

1124

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

1125

interface, debug ? debug_flag : NULL, NULL },

1126

environ) == -1){

1127

#ifdef __GNUC__

1128

#pragma GCC diagnostic pop

1129

#endif

1130

perror_plus("fexecve");

1131

_exit(EXIT_FAILURE);

1132

}

1133

}

1134

if(pid == -1){

1135

perror_plus("fork");

1136

return false;

1137

}

1138

int status;

1139

pid_t pret = -1;

1140

errno = 0;

1141

do {

1142

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

1143

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

1144

int errno_raising = 0;

1145

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

1146

errno_raising = errno;

1147

perror_plus("Failed to raise privileges in order to"

1148

" kill helper program");

1149

}

1150

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

1151

perror_plus("kill");

1152

}

1153

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

1154

perror_plus("Failed to lower privileges after killing"

1155

" helper program");

1156

}

1157

return false;

1158

}

1159

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

1160

if(pret == -1){

1161

perror_plus("waitpid");

1162

return false;

1163

}

1164

if(WIFEXITED(status)){

1165

if(WEXITSTATUS(status) != 0){

1166

fprintf_plus(stderr, "Error: iprouteadddel exited"

1167

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

1168

return false;

1169

}

1170

return true;

1171

}

1172

if(WIFSIGNALED(status)){

1173

fprintf_plus(stderr, "Error: iprouteadddel died by"

1174

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

1175

return false;

1176

}

1177

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

1178

return false;

1179

}

1180

1181

__attribute__((nonnull, warn_unused_result))

1182

static bool add_local_route(const char *address,

1183

AvahiIfIndex if_index){

1184

if(debug){

1185

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

1186

}

1187

return add_delete_local_route(true, address, if_index);

1188

}

1189

1190

__attribute__((nonnull, warn_unused_result))

1191

static bool delete_local_route(const char *address,

1192

AvahiIfIndex if_index){

1193

if(debug){

1194

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

1195

}

1196

return add_delete_local_route(false, address, if_index);

1197

}

1198

1199

619

/* Called when a Mandos server is found */

1200

__attribute__((nonnull, warn_unused_result))

1201

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

620

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

1202

621

AvahiIfIndex if_index,

1203

int af, mandos_context *mc){

622

int af){

1204

623

int ret, tcp_sd = -1;

1205

624

ssize_t sret;

1206

struct sockaddr_storage to;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

1207

629

char *buffer = NULL;

1208

630

char *decrypted_buffer = NULL;

1209

631

size_t buffer_length = 0;

1212

634

int retval = -1;

1213

635

gnutls_session_t session;

1214

636

int pf; /* Protocol family */

1215

bool route_added = false;

1216

637

1217

638

errno = 0;

1218

639

1234

655

return -1;

1235

656

}

1236

657

1237

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

1238

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

1239

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

1240

bool match = false;

1241

{

1242

char *interface = NULL;

1243

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

1244

mc->interfaces_size,

1245

interface))){

1246

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

1247

match = true;

1248

break;

1249

}

1250

}

1251

}

1252

if(not match){

1253

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

1254

connect to the server */

1255

if(debug){

1256

char interface[IF_NAMESIZE];

1257

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

1258

perror_plus("if_indextoname");

1259

} else {

1260

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

1261

" \"%s\"\n",

1262

if_indextoname((unsigned int)if_index,

1263

interface));

1264

}

1265

}

1266

return -1;

1267

}

1268

}

1269

1270

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

1271

659

if(ret != 0){

1272

660

return -1;

1273

661

}

1274

662

1275

663

if(debug){

1276

664

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

1277

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

665

PRIu16 "\n", ip, port);

1278

666

}

1279

667

1280

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

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

1281

669

if(tcp_sd < 0){

1282

670

int e = errno;

1283

671

perror_plus("socket");

1290

678

goto mandos_end;

1291

679

}

1292

680

681

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

1293

682

if(af == AF_INET6){

1294

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

1295

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

1296

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

683

to.in6.sin6_family = (sa_family_t)af;

684

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

1297

685

} else { /* IPv4 */

1298

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

1299

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

1300

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

686

to.in.sin_family = (sa_family_t)af;

687

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

1301

688

}

1302

689

if(ret < 0 ){

1303

690

int e = errno;

1312

699

goto mandos_end;

1313

700

}

1314

701

if(af == AF_INET6){

1315

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

1316

if(IN6_IS_ADDR_LINKLOCAL

1317

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

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

1318

709

if(if_index == AVAHI_IF_UNSPEC){

1319

710

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

1320

711

" incomplete without a network interface\n");

1322

713

goto mandos_end;

1323

714

}

1324

715

/* Set the network interface number as scope */

1325

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

716

to.in6.sin6_scope_id = (uint32_t)if_index;

1326

717

}

1327

718

} else {

1328

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

719

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

720

-Wconversion and

721

-Wunreachable-code */

1329

722

}

1330

723

1331

724

if(quit_now){

1339

732

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

1340

733

perror_plus("if_indextoname");

1341

734

} else {

1342

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

1343

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

735

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

736

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

1344

737

}

1345

738

} else {

1346

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

1347

ip, (uintmax_t)port);

739

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

740

ip, port);

1348

741

}

1349

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1350

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1351

if(af == AF_INET6){

1352

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

1353

sizeof(struct sockaddr_in6),

1354

addrstr, sizeof(addrstr), NULL, 0,

1355

NI_NUMERICHOST);

1356

} else {

1357

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

1358

sizeof(struct sockaddr_in),

1359

addrstr, sizeof(addrstr), NULL, 0,

1360

NI_NUMERICHOST);

1361

}

1362

if(ret == EAI_SYSTEM){

1363

perror_plus("getnameinfo");

1364

} else if(ret != 0) {

1365

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

1366

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

1367

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

1368

}

1369

}

1370

1371

if(quit_now){

1372

errno = EINTR;

1373

goto mandos_end;

1374

}

1375

1376

while(true){

1377

if(af == AF_INET6){

1378

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

1379

sizeof(struct sockaddr_in6));

1380

} else {

1381

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

1382

sizeof(struct sockaddr_in));

1383

}

1384

if(ret < 0){

1385

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

1386

and if_index != AVAHI_IF_UNSPEC

1387

and connect_to == NULL

1388

and not route_added and

1389

((af == AF_INET6 and not

1390

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1391

&to)->sin6_addr)))

1392

or (af == AF_INET and

1393

/* Not a a IPv4LL address */

1394

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

1395

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

1396

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

1397

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

1398

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

1399

connect to a Mandos server announced by Avahi on a server

1400

host with a global address. Work around this by retrying

1401

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

1402

1403

Avahi bug reference:

1404

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

1405

https://bugs.debian.org/587961

1406

*/

1407

if(debug){

1408

fprintf_plus(stderr, "Mandos server unreachable, trying"

1409

" direct route\n");

1410

}

1411

int e = errno;

1412

route_added = add_local_route(ip, if_index);

1413

if(route_added){

1414

continue;

1415

}

1416

errno = e;

1417

}

1418

if(errno != ECONNREFUSED or debug){

1419

int e = errno;

1420

perror_plus("connect");

1421

errno = e;

1422

}

1423

goto mandos_end;

1424

}

1425

1426

if(quit_now){

1427

errno = EINTR;

1428

goto mandos_end;

1429

}

1430

break;

744

const char *pcret;

745

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

748

} else {

749

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

750

sizeof(addrstr));

751

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

758

}

759

}

760

761

if(quit_now){

762

errno = EINTR;

763

goto mandos_end;

764

}

765

766

if(af == AF_INET6){

767

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

768

} else {

769

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

770

}

771

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

777

goto mandos_end;

778

}

779

780

if(quit_now){

781

errno = EINTR;

782

goto mandos_end;

1431

783

}

1432

784

1433

785

const char *out = mandos_protocol_version;

1469

821

goto mandos_end;

1470

822

}

1471

823

1472

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

1473

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

1474

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

1475

gnutls_transport_set_ptr(session,

1476

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1477

826

1478

827

if(quit_now){

1479

828

errno = EINTR;

1584

933

if(buffer_length > 0){

1585

934

ssize_t decrypted_buffer_size;

1586

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1587

&decrypted_buffer, mc);

936

&decrypted_buffer);

1588

937

if(decrypted_buffer_size >= 0){

1589

938

1590

clearerr(stdout);

1591

939

written = 0;

1592

940

while(written < (size_t) decrypted_buffer_size){

1593

941

if(quit_now){

1609

957

}

1610

958

written += (size_t)ret;

1611

959

}

1612

ret = fflush(stdout);

1613

if(ret != 0){

1614

int e = errno;

1615

if(debug){

1616

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

1617

strerror(errno));

1618

}

1619

errno = e;

1620

goto mandos_end;

1621

}

1622

960

retval = 0;

1623

961

}

1624

962

}

1627

965

1628

966

mandos_end:

1629

967

{

1630

if(route_added){

1631

if(not delete_local_route(ip, if_index)){

1632

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

1633

" interface %d", ip, if_index);

1634

}

1635

}

1636

968

int e = errno;

1637

969

free(decrypted_buffer);

1638

970

free(buffer);

1639

971

if(tcp_sd >= 0){

1640

ret = close(tcp_sd);

972

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

1641

973

}

1642

974

if(ret == -1){

1643

975

if(e == 0){

1668

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1669

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1670

1002

flags,

1671

void *mc){

1672

if(r == NULL){

1673

return;

1674

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1675

1005

1676

1006

/* Called whenever a service has been resolved successfully or

1677

1007

timed out */

1678

1008

1679

1009

if(quit_now){

1680

avahi_s_service_resolver_free(r);

1681

1010

return;

1682

1011

}

1683

1012

1687

1016

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

1688

1017

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

1689

1018

domain,

1690

avahi_strerror(avahi_server_errno

1691

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1692

1020

break;

1693

1021

1694

1022

case AVAHI_RESOLVER_FOUND:

1700

1028

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

1701

1029

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

1702

1030

}

1703

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

1704

interface,

1705

avahi_proto_to_af(proto),

1706

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1707

1033

if(ret == 0){

1708

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1709

1035

} else {

1710

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

1711

avahi_proto_to_af(proto),

1712

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1713

1038

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

1714

1039

" list\n", name);

1715

1040

}

1728

1053

const char *domain,

1729

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1730

1055

flags,

1731

void *mc){

1732

if(b == NULL){

1733

return;

1734

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1735

1058

1736

1059

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

1737

1060

is removed from the LAN */

1745

1068

case AVAHI_BROWSER_FAILURE:

1746

1069

1747

1070

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

1748

avahi_strerror(avahi_server_errno

1749

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

1750

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1751

1073

return;

1752

1074

1753

1075

case AVAHI_BROWSER_NEW:

1756

1078

the callback function is called the Avahi server will free the

1757

1079

resolver for us. */

1758

1080

1759

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

1760

interface, protocol, name, type,

1761

domain, protocol, 0,

1762

resolve_callback, mc) == NULL)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1763

1084

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

1764

1085

" %s\n", name,

1765

avahi_strerror(avahi_server_errno

1766

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1767

1087

break;

1768

1088

1769

1089

case AVAHI_BROWSER_REMOVE:

1788

1108

signal_received = sig;

1789

1109

int old_errno = errno;

1790

1110

/* set main loop to exit */

1791

if(simple_poll != NULL){

1792

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1793

1113

}

1794

1114

errno = old_errno;

1795

1115

}

1796

1116

1797

__attribute__((nonnull, warn_unused_result))

1798

1117

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

1799

1118

int ret;

1800

int old_errno;

1801

1119

1802

1120

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

1803

1121

if(s < 0){

1804

old_errno = errno;

1805

1122

perror_plus("socket");

1806

errno = old_errno;

1807

1123

return false;

1808

1124

}

1809

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

1810

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

1125

strcpy(ifr->ifr_name, ifname);

1811

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1812

1127

if(ret == -1){

1813

1128

if(debug){

1814

old_errno = errno;

1815

1129

perror_plus("ioctl SIOCGIFFLAGS");

1816

errno = old_errno;

1817

}

1818

if((close(s) == -1) and debug){

1819

old_errno = errno;

1820

perror_plus("close");

1821

errno = old_errno;

1822

1130

}

1823

1131

return false;

1824

1132

}

1825

if((close(s) == -1) and debug){

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1830

1133

return true;

1831

1134

}

1832

1135

1833

__attribute__((nonnull, warn_unused_result))

1834

1136

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

1835

1137

1836

1138

/* Reject the loopback device */

1878

1180

* corresponds to an acceptable network device.

1879

1181

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

1880

1182

*/

1881

__attribute__((nonnull, warn_unused_result))

1882

1183

int good_interface(const struct dirent *if_entry){

1883

1184

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

1884

1185

return 0;

1900

1201

}

1901

1202

1902

1203

/*

1903

* This function determines if a network interface is up.

1904

*/

1905

__attribute__((nonnull, warn_unused_result))

1906

bool interface_is_up(const char *interface){

1907

struct ifreq ifr;

1908

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

1909

if(debug){

1910

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

1911

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

1912

}

1913

return false;

1914

}

1915

1916

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

1917

}

1918

1919

/*

1920

* This function determines if a network interface is running

1921

*/

1922

__attribute__((nonnull, warn_unused_result))

1923

bool interface_is_running(const char *interface){

1924

struct ifreq ifr;

1925

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

1926

if(debug){

1927

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

1928

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

1929

}

1930

return false;

1931

}

1932

1933

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

1934

}

1935

1936

__attribute__((nonnull, pure, warn_unused_result))

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1937

1246

int notdotentries(const struct dirent *direntry){

1938

1247

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

1939

1248

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

1946

1255

}

1947

1256

1948

1257

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

1949

__attribute__((nonnull, warn_unused_result))

1950

1258

int runnable_hook(const struct dirent *direntry){

1951

1259

int ret;

1952

1260

size_t sret;

1960

1268

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

1961

1269

"abcdefghijklmnopqrstuvwxyz"

1962

1270

"0123456789"

1963

"_.-");

1271

"_-");

1964

1272

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

1965

1273

/* Contains non-allowed characters */

1966

1274

if(debug){

1970

1278

return 0;

1971

1279

}

1972

1280

1973

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

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1974

1289

if(ret == -1){

1975

1290

if(debug){

1976

1291

perror_plus("Could not stat hook");

2000

1315

return 1;

2001

1316

}

2002

1317

2003

__attribute__((nonnull, warn_unused_result))

2004

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

2005

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

2006

1319

int ret;

2007

1320

struct timespec now;

2008

1321

struct timespec waited_time;

2009

1322

intmax_t block_time;

2010

1323

2011

1324

while(true){

2012

if(mc->current_server == NULL){

2013

if(debug){

1325

if(mc.current_server == NULL){

1326

if (debug){

2014

1327

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

2015

1328

" No timeout!\n");

2016

1329

}

2017

1330

ret = avahi_simple_poll_iterate(s, -1);

2018

1331

} else {

2019

if(debug){

1332

if (debug){

2020

1333

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

2021

1334

" it, or wait\n");

2022

1335

}

2029

1342

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

2030

1343

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

2031

1344

waited_time.tv_sec = (now.tv_sec

2032

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

1345

- mc.current_server->last_seen.tv_sec);

2033

1346

waited_time.tv_nsec = (now.tv_nsec

2034

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

1347

- mc.current_server->last_seen.tv_nsec);

2035

1348

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

2036

1349

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

2037

1350

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

2039

1352

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

2040

1353

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

2041

1354

2042

if(debug){

1355

if (debug){

2043

1356

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

2044

1357

block_time);

2045

1358

}

2046

1359

2047

1360

if(block_time <= 0){

2048

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

2049

mc->current_server->port,

2050

mc->current_server->if_index,

2051

mc->current_server->af, mc);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

2052

1365

if(ret == 0){

2053

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

2054

1367

return 0;

2055

1368

}

2056

1369

ret = clock_gettime(CLOCK_MONOTONIC,

2057

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

2058

1371

if(ret == -1){

2059

1372

perror_plus("clock_gettime");

2060

1373

return -1;

2061

1374

}

2062

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

1375

mc.current_server = mc.current_server->next;

2063

1376

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

2064

1377

servers, but don't block */

2065

1378

}

2067

1380

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

2068

1381

}

2069

1382

if(ret != 0){

2070

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

1383

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

2071

1384

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

2072

1385

}

2073

1386

}

2074

1387

}

2075

1388

}

2076

1389

2077

__attribute__((nonnull))

2078

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

1390

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

2079

1391

const float delay){

2080

struct dirent **direntries = NULL;

2081

if(hookdir_fd == -1){

2082

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2083

| O_CLOEXEC);

2084

if(hookdir_fd == -1){

2085

if(errno == ENOENT){

2086

if(debug){

2087

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

2088

" found\n", hookdir);

2089

}

2090

} else {

2091

perror_plus("open");

2092

}

2093

return;

2094

}

2095

}

2096

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

2097

if(devnull == -1){

2098

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

2099

return;

2100

}

2101

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

2102

runnable_hook, alphasort);

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

2103

1397

if(numhooks == -1){

2104

1398

perror_plus("scandir");

2105

close(devnull);

2106

return;

2107

}

2108

struct dirent *direntry;

2109

int ret;

2110

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

2111

direntry = direntries[i];

2112

if(debug){

2113

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

2114

direntry->d_name);

2115

}

2116

pid_t hook_pid = fork();

2117

if(hook_pid == 0){

2118

/* Child */

2119

/* Raise privileges */

2120

errno = raise_privileges_permanently();

2121

if(errno != 0){

2122

perror_plus("Failed to raise privileges");

2123

_exit(EX_NOPERM);

2124

}

2125

/* Set group */

2126

errno = 0;

2127

ret = setgid(0);

2128

if(ret == -1){

2129

perror_plus("setgid");

2130

_exit(EX_NOPERM);

2131

}

2132

/* Reset supplementary groups */

2133

errno = 0;

2134

ret = setgroups(0, NULL);

2135

if(ret == -1){

2136

perror_plus("setgroups");

2137

_exit(EX_NOPERM);

2138

}

2139

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

2140

if(ret == -1){

2141

perror_plus("setenv");

2142

_exit(EX_OSERR);

2143

}

2144

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

2145

if(ret == -1){

2146

perror_plus("setenv");

2147

_exit(EX_OSERR);

2148

}

2149

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

2150

if(ret == -1){

2151

perror_plus("setenv");

2152

_exit(EX_OSERR);

2153

}

2154

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

2155

if(ret == -1){

2156

perror_plus("setenv");

2157

_exit(EX_OSERR);

2158

}

2159

char *delaystring;

2160

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

2161

if(ret == -1){

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

2162

1406

perror_plus("asprintf");

2163

_exit(EX_OSERR);

2164

}

2165

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

2166

if(ret == -1){

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

2167

1475

free(delaystring);

2168

perror_plus("setenv");

2169

_exit(EX_OSERR);

2170

}

2171

free(delaystring);

2172

if(connect_to != NULL){

2173

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

2174

if(ret == -1){

2175

perror_plus("setenv");

2176

_exit(EX_OSERR);

2177

}

2178

}

2179

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

2180

direntry->d_name,

2181

O_RDONLY));

2182

if(hook_fd == -1){

2183

perror_plus("openat");

2184

_exit(EXIT_FAILURE);

2185

}

2186

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

2187

perror_plus("close");

2188

_exit(EXIT_FAILURE);

2189

}

2190

ret = dup2(devnull, STDIN_FILENO);

2191

if(ret == -1){

2192

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

2193

_exit(EX_OSERR);

2194

}

2195

ret = close(devnull);

2196

if(ret == -1){

2197

perror_plus("close");

2198

_exit(EX_OSERR);

2199

}

2200

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2201

if(ret == -1){

2202

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

2203

_exit(EX_OSERR);

2204

}

2205

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

2206

environ) == -1){

2207

perror_plus("fexecve");

2208

_exit(EXIT_FAILURE);

2209

}

2210

} else {

2211

if(hook_pid == -1){

2212

perror_plus("fork");

2213

free(direntry);

2214

continue;

2215

}

2216

int status;

2217

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

2218

perror_plus("waitpid");

2219

free(direntry);

2220

continue;

2221

}

2222

if(WIFEXITED(status)){

2223

if(WEXITSTATUS(status) != 0){

2224

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

2225

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

2226

WEXITSTATUS(status));

2227

free(direntry);

2228

continue;

2229

}

2230

} else if(WIFSIGNALED(status)){

2231

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

2232

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

2233

WTERMSIG(status));

2234

free(direntry);

2235

continue;

2236

} else {

2237

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

2238

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

2239

free(direntry);

2240

continue;

2241

}

2242

}

2243

if(debug){

2244

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

2245

direntry->d_name);

2246

}

2247

free(direntry);

2248

}

2249

free(direntries);

2250

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

2251

perror_plus("close");

2252

} else {

2253

hookdir_fd = -1;

2254

}

2255

close(devnull);

2256

}

2257

2258

__attribute__((nonnull, warn_unused_result))

2259

int bring_up_interface(const char *const interface,

2260

const float delay){

2261

int old_errno = errno;

2262

int ret;

2263

struct ifreq network;

2264

unsigned int if_index = if_nametoindex(interface);

2265

if(if_index == 0){

2266

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

2267

errno = old_errno;

2268

return ENXIO;

2269

}

2270

2271

if(quit_now){

2272

errno = old_errno;

2273

return EINTR;

2274

}

2275

2276

if(not interface_is_up(interface)){

2277

int ret_errno = 0;

2278

int ioctl_errno = 0;

2279

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

2280

ret_errno = errno;

2281

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

2282

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

2283

errno = old_errno;

2284

return ret_errno;

2285

}

2286

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

2287

2288

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

2289

if(sd == -1){

2290

ret_errno = errno;

2291

perror_plus("socket");

2292

errno = old_errno;

2293

return ret_errno;

2294

}

2295

2296

if(quit_now){

2297

ret = close(sd);

2298

if(ret == -1){

2299

perror_plus("close");

2300

}

2301

errno = old_errno;

2302

return EINTR;

2303

}

2304

2305

if(debug){

2306

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

2307

interface);

2308

}

2309

2310

/* Raise privileges */

2311

ret_errno = raise_privileges();

2312

if(ret_errno != 0){

2313

errno = ret_errno;

2314

perror_plus("Failed to raise privileges");

2315

}

2316

2317

#ifdef __linux__

2318

int ret_linux;

2319

bool restore_loglevel = false;

2320

if(ret_errno == 0){

2321

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2322

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

2323

ret_linux = klogctl(8, NULL, 5);

2324

if(ret_linux == -1){

2325

perror_plus("klogctl");

2326

} else {

2327

restore_loglevel = true;

2328

}

2329

}

2330

#endif /* __linux__ */

2331

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

2332

ioctl_errno = errno;

2333

#ifdef __linux__

2334

if(restore_loglevel){

2335

ret_linux = klogctl(7, NULL, 0);

2336

if(ret_linux == -1){

2337

perror_plus("klogctl");

2338

}

2339

}

2340

#endif /* __linux__ */

2341

2342

/* If raise_privileges() succeeded above */

2343

if(ret_errno == 0){

2344

/* Lower privileges */

2345

ret_errno = lower_privileges();

2346

if(ret_errno != 0){

2347

errno = ret_errno;

2348

perror_plus("Failed to lower privileges");

2349

}

2350

}

2351

2352

/* Close the socket */

2353

ret = close(sd);

2354

if(ret == -1){

2355

perror_plus("close");

2356

}

2357

2358

if(ret_setflags == -1){

2359

errno = ioctl_errno;

2360

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2361

errno = old_errno;

2362

return ioctl_errno;

2363

}

2364

} else if(debug){

2365

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

2366

interface);

2367

}

2368

2369

/* Sleep checking until interface is running.

2370

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

2371

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

2372

if(interface_is_running(interface)){

2373

break;

2374

}

2375

struct timespec sleeptime = { .tv_nsec = 250000000 };

2376

ret = nanosleep(&sleeptime, NULL);

2377

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

2378

perror_plus("nanosleep");

2379

}

2380

}

2381

2382

errno = old_errno;

2383

return 0;

2384

}

2385

2386

__attribute__((nonnull, warn_unused_result))

2387

int take_down_interface(const char *const interface){

2388

int old_errno = errno;

2389

struct ifreq network;

2390

unsigned int if_index = if_nametoindex(interface);

2391

if(if_index == 0){

2392

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

2393

errno = old_errno;

2394

return ENXIO;

2395

}

2396

if(interface_is_up(interface)){

2397

int ret_errno = 0;

2398

int ioctl_errno = 0;

2399

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

2400

ret_errno = errno;

2401

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

2402

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

2403

errno = old_errno;

2404

return ret_errno;

2405

}

2406

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

2407

2408

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

2409

if(sd == -1){

2410

ret_errno = errno;

2411

perror_plus("socket");

2412

errno = old_errno;

2413

return ret_errno;

2414

}

2415

2416

if(debug){

2417

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

2418

interface);

2419

}

2420

2421

/* Raise privileges */

2422

ret_errno = raise_privileges();

2423

if(ret_errno != 0){

2424

errno = ret_errno;

2425

perror_plus("Failed to raise privileges");

2426

}

2427

2428

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

2429

ioctl_errno = errno;

2430

2431

/* If raise_privileges() succeeded above */

2432

if(ret_errno == 0){

2433

/* Lower privileges */

2434

ret_errno = lower_privileges();

2435

if(ret_errno != 0){

2436

errno = ret_errno;

2437

perror_plus("Failed to lower privileges");

2438

}

2439

}

2440

2441

/* Close the socket */

2442

int ret = close(sd);

2443

if(ret == -1){

2444

perror_plus("close");

2445

}

2446

2447

if(ret_setflags == -1){

2448

errno = ioctl_errno;

2449

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2450

errno = old_errno;

2451

return ioctl_errno;

2452

}

2453

} else if(debug){

2454

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

2455

interface);

2456

}

2457

2458

errno = old_errno;

2459

return 0;

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

2460

1524

}

2461

1525

2462

1526

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

2463

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

2464

#if GNUTLS_VERSION_NUMBER >= 0x030606

2465

.priority = "SECURE128:!CTYPE-X.509"

2466

":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"

2467

":%PROFILE_ULTRA",

2468

#elif GNUTLS_VERSION_NUMBER < 0x030600

2469

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

2470

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

2471

#else

2472

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

2473

#endif

2474

.current_server = NULL, .interfaces = NULL,

2475

.interfaces_size = 0 };

2476

1527

AvahiSServiceBrowser *sb = NULL;

2477

error_t ret_errno;

1528

int error;

2478

1529

int ret;

2479

1530

intmax_t tmpmax;

2480

1531

char *tmp;

2481

1532

int exitcode = EXIT_SUCCESS;

2482

char *interfaces_to_take_down = NULL;

2483

size_t interfaces_to_take_down_size = 0;

2484

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

2485

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

2486

char *tempdir = NULL;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1539

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

1540

bool tempdir_created = false;

2487

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2488

1542

const char *seckey = PATHDIR "/" SECKEY;

2489

1543

const char *pubkey = PATHDIR "/" PUBKEY;

2490

#if GNUTLS_VERSION_NUMBER >= 0x030606

2491

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2492

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2493

#endif

2494

const char *dh_params_file = NULL;

2495

char *interfaces_hooks = NULL;

2496

1544

2497

1545

bool gnutls_initialized = false;

2498

1546

bool gpgme_initialized = false;

2544

1592

{ .name = "pubkey", .key = 'p',

2545

1593

.arg = "FILE",

2546

1594

.doc = "OpenPGP public key file base name",

2547

.group = 1 },

2548

{ .name = "tls-privkey", .key = 't',

2549

.arg = "FILE",

2550

#if GNUTLS_VERSION_NUMBER >= 0x030606

2551

.doc = "TLS private key file base name",

2552

#else

2553

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2554

#endif

2555

.group = 1 },

2556

{ .name = "tls-pubkey", .key = 'T',

2557

.arg = "FILE",

2558

#if GNUTLS_VERSION_NUMBER >= 0x030606

2559

.doc = "TLS public key file base name",

2560

#else

2561

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2562

#endif

2563

.group = 1 },

1595

.group = 2 },

2564

1596

{ .name = "dh-bits", .key = 129,

2565

1597

.arg = "BITS",

2566

1598

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

2567

1599

" Diffie-Hellman key exchange",

2568

1600

.group = 2 },

2569

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

2570

.arg = "FILE",

2571

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

2572

" for the Diffie-Hellman key exchange",

2573

.group = 2 },

2574

1601

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

2575

1602

.arg = "STRING",

2576

1603

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

2610

1637

connect_to = arg;

2611

1638

break;

2612

1639

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

2613

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

2614

arg, (int)',');

2615

if(ret_errno != 0){

2616

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

2617

}

1640

interface = arg;

2618

1641

break;

2619

1642

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

2620

1643

seckey = arg;

2622

1645

case 'p': /* --pubkey */

2623

1646

pubkey = arg;

2624

1647

break;

2625

case 't': /* --tls-privkey */

2626

#if GNUTLS_VERSION_NUMBER >= 0x030606

2627

tls_privkey = arg;

2628

#endif

2629

break;

2630

case 'T': /* --tls-pubkey */

2631

#if GNUTLS_VERSION_NUMBER >= 0x030606

2632

tls_pubkey = arg;

2633

#endif

2634

break;

2635

1648

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

2636

1649

errno = 0;

2637

1650

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

2641

1654

}

2642

1655

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

2643

1656

break;

2644

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

2645

dh_params_file = arg;

2646

break;

2647

1657

case 130: /* --priority */

2648

1658

mc.priority = arg;

2649

1659

break;

2672

1682

argp_state_help(state, state->out_stream,

2673

1683

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2674

1684

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2675

__builtin_unreachable();

2676

1685

case -3: /* --usage */

2677

1686

argp_state_help(state, state->out_stream,

2678

1687

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2679

__builtin_unreachable();

2680

1688

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

2681

1689

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

2682

1690

exit(argp_err_exit_status);

2691

1699

.args_doc = "",

2692

1700

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

2693

1701

" passwords from a Mandos server" };

2694

ret_errno = argp_parse(&argp, argc, argv,

2695

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2696

switch(ret_errno){

1702

ret = argp_parse(&argp, argc, argv,

1703

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1704

switch(ret){

2697

1705

case 0:

2698

1706

break;

2699

1707

case ENOMEM:

2700

1708

default:

2701

errno = ret_errno;

1709

errno = ret;

2702

1710

perror_plus("argp_parse");

2703

1711

exitcode = EX_OSERR;

2704

1712

goto end;

2707

1715

goto end;

2708

1716

}

2709

1717

}

2710

1718

2711

1719

{

2712

1720

/* Work around Debian bug #633582:

2713

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

1721

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

2714

1722

2715

/* Re-raise privileges */

2716

ret = raise_privileges();

2717

if(ret != 0){

2718

errno = ret;

2719

perror_plus("Failed to raise privileges");

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

2720

1728

} else {

2721

1729

struct stat st;

2722

1730

2737

1745

}

2738

1746

}

2739

1747

}

2740

close(seckey_fd);

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

2741

1749

}

2742

1750

}

2743

1751

2744

1752

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

2745

1753

int pubkey_fd = open(pubkey, O_RDONLY);

2746

1754

if(pubkey_fd == -1){

2758

1766

}

2759

1767

}

2760

1768

}

2761

close(pubkey_fd);

2762

}

2763

}

2764

2765

if(dh_params_file != NULL

2766

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

2767

int dhparams_fd = open(dh_params_file, O_RDONLY);

2768

if(dhparams_fd == -1){

2769

perror_plus("open");

2770

} else {

2771

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

2772

if(ret == -1){

2773

perror_plus("fstat");

2774

} else {

2775

if(S_ISREG(st.st_mode)

2776

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

2777

ret = fchown(dhparams_fd, uid, gid);

2778

if(ret == -1){

2779

perror_plus("fchown");

2780

}

2781

}

2782

}

2783

close(dhparams_fd);

2784

}

2785

}

2786

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

2787

1773

/* Lower privileges */

2788

ret = lower_privileges();

2789

if(ret != 0){

2790

errno = ret;

2791

perror_plus("Failed to lower privileges");

2792

}

2793

}

2794

}

2795

2796

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

2797

{

2798

char *interface = NULL;

2799

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

2800

interface))){

2801

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

2802

and if_nametoindex(interface) == 0){

2803

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

2804

fprintf_plus(stderr, "Not using nonexisting interface"

2805

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

2806

}

2807

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

2808

interface = NULL;

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2809

1778

}

2810

1779

}

2811

1780

}

2812

1781

2813

1782

/* Run network hooks */

2814

{

2815

if(mc.interfaces != NULL){

2816

interfaces_hooks = malloc(mc.interfaces_size);

2817

if(interfaces_hooks == NULL){

2818

perror_plus("malloc");

2819

goto end;

2820

}

2821

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

2822

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

2823

}

2824

run_network_hooks("start", interfaces_hooks != NULL ?

2825

interfaces_hooks : "", delay);

1783

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

1784

goto end;

2826

1785

}

2827

1786

2828

1787

if(not debug){

2829

1788

avahi_set_log_function(empty_log);

2830

1789

}

2831

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

2832

1823

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

2833

1824

from the signal handler */

2834

1825

/* Initialize the pseudo-RNG for Avahi */

2835

1826

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

2836

simple_poll = avahi_simple_poll_new();

2837

if(simple_poll == NULL){

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2838

1829

fprintf_plus(stderr,

2839

1830

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

2840

1831

exitcode = EX_UNAVAILABLE;

2904

1895

}

2905

1896

}

2906

1897

2907

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

2908

if(mc.interfaces == NULL){

2909

struct dirent **direntries = NULL;

2910

/* Look for any good interfaces */

2911

ret = scandir(sys_class_net, &direntries, good_interface,

2912

alphasort);

2913

if(ret >= 1){

2914

/* Add all found interfaces to interfaces list */

2915

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

2916

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

2917

direntries[i]->d_name);

2918

if(ret_errno != 0){

2919

errno = ret_errno;

2920

perror_plus("argz_add");

2921

free(direntries[i]);

2922

continue;

2923

}

2924

if(debug){

2925

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

2926

direntries[i]->d_name);

2927

}

2928

free(direntries[i]);

2929

}

2930

free(direntries);

2931

} else {

2932

if(ret == 0){

2933

free(direntries);

2934

}

2935

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

2936

exitcode = EXIT_FAILURE;

2937

goto end;

2938

}

2939

}

2940

2941

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

2942

{

2943

char *interface = NULL;

2944

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

2945

interface))){

2946

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

2947

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

2948

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

2949

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

2950

interface);

2951

interface = NULL;

2952

while((interface = argz_next(mc.interfaces,

2953

mc.interfaces_size, interface))){

2954

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

2955

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

2956

interface);

2957

interface = NULL;

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2958

1983

}

2959

1984

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2960

2002

break;

2961

2003

}

2962

bool interface_was_up = interface_is_up(interface);

2963

errno = bring_up_interface(interface, delay);

2964

if(not interface_was_up){

2965

if(errno != 0){

2966

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

2967

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

2968

} else {

2969

errno = argz_add(&interfaces_to_take_down,

2970

&interfaces_to_take_down_size,

2971

interface);

2972

if(errno != 0){

2973

perror_plus("argz_add");

2974

}

2975

}

2976

}

2977

}

2978

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

2979

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

2980

}

2981

}

2982

2983

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

2984

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

2985

if(debug){

2986

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

2987

mc.interfaces);

2988

}

2989

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

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2990

2033

}

2991

2034

2992

2035

if(quit_now){

2993

2036

goto end;

2994

2037

}

2995

2038

2996

#if GNUTLS_VERSION_NUMBER >= 0x030606

2997

ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);

2998

#elif GNUTLS_VERSION_NUMBER < 0x030600

2999

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

3000

#else

3001

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

3002

#endif

2039

ret = init_gnutls_global(pubkey, seckey);

3003

2040

if(ret == -1){

3004

2041

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

3005

2042

exitcode = EX_UNAVAILABLE;

3012

2049

goto end;

3013

2050

}

3014

2051

3015

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

3016

tempdir = mkdtemp(run_tempdir);

3017

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

3018

if(debug){

3019

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

3020

run_tempdir, old_tempdir);

3021

}

3022

tempdir = mkdtemp(old_tempdir);

3023

}

3024

if(tempdir == NULL){

2052

if(mkdtemp(tempdir) == NULL){

3025

2053

perror_plus("mkdtemp");

3026

2054

goto end;

3027

2055

}

2056

tempdir_created = true;

3028

2057

3029

2058

if(quit_now){

3030

2059

goto end;

3031

2060

}

3032

2061

3033

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

2062

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

3034

2063

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

3035

2064

exitcode = EX_UNAVAILABLE;

3036

2065

goto end;

3046

2075

/* Connect directly, do not use Zeroconf */

3047

2076

/* (Mainly meant for debugging) */

3048

2077

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

3049

3050

2078

if(address == NULL){

3051

2079

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

3052

2080

exitcode = EX_USAGE;

3057

2085

goto end;

3058

2086

}

3059

2087

3060

in_port_t port;

2088

uint16_t port;

3061

2089

errno = 0;

3062

2090

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

3063

2091

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

3064

or tmpmax != (in_port_t)tmpmax){

2092

or tmpmax != (uint16_t)tmpmax){

3065

2093

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

3066

2094

exitcode = EX_USAGE;

3067

2095

goto end;

3068

2096

}

3069

2097

3070

2098

if(quit_now){

3071

2099

goto end;

3072

2100

}

3073

2101

3074

port = (in_port_t)tmpmax;

2102

port = (uint16_t)tmpmax;

3075

2103

*address = '\0';

3076

2104

/* Colon in address indicates IPv6 */

3077

2105

int af;

3093

2121

}

3094

2122

3095

2123

while(not quit_now){

3096

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

3097

&mc);

2124

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

3098

2125

if(quit_now or ret == 0){

3099

2126

break;

3100

2127

}

3102

2129

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

3103

2130

(int)retry_interval);

3104

2131

}

3105

sleep((unsigned int)retry_interval);

2132

sleep((int)retry_interval);

3106

2133

}

3107

2134

3108

if(not quit_now){

2135

if (not quit_now){

3109

2136

exitcode = EXIT_SUCCESS;

3110

2137

}

3111

2138

3126

2153

config.publish_domain = 0;

3127

2154

3128

2155

/* Allocate a new server */

3129

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3130

&config, NULL, NULL, &ret);

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

3131

2159

3132

2160

/* Free the Avahi configuration data */

3133

2161

avahi_server_config_free(&config);

3136

2164

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

3137

2165

if(mc.server == NULL){

3138

2166

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

3139

avahi_strerror(ret));

2167

avahi_strerror(error));

3140

2168

exitcode = EX_UNAVAILABLE;

3141

2169

goto end;

3142

2170

}

3148

2176

/* Create the Avahi service browser */

3149

2177

sb = avahi_s_service_browser_new(mc.server, if_index,

3150

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

3151

NULL, 0, browse_callback,

3152

(void *)&mc);

2179

NULL, 0, browse_callback, NULL);

3153

2180

if(sb == NULL){

3154

2181

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

3155

2182

avahi_strerror(avahi_server_errno(mc.server)));

3166

2193

if(debug){

3167

2194

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

3168

2195

}

3169

3170

ret = avahi_loop_with_timeout(simple_poll,

3171

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

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

3172

2199

if(debug){

3173

2200

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

3174

2201

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

3177

2204

end:

3178

2205

3179

2206

if(debug){

3180

if(signal_received){

3181

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

3182

argv[0], signal_received,

3183

strsignal(signal_received));

3184

} else {

3185

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

3186

}

2207

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

3187

2208

}

3188

2209

3189

2210

/* Cleanup things */

3190

free(mc.interfaces);

3191

3192

2211

if(sb != NULL)

3193

2212

avahi_s_service_browser_free(sb);

3194

2213

3195

2214

if(mc.server != NULL)

3196

2215

avahi_server_free(mc.server);

3197

2216

3198

if(simple_poll != NULL)

3199

avahi_simple_poll_free(simple_poll);

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

3200

2219

3201

2220

if(gnutls_initialized){

3202

2221

gnutls_certificate_free_credentials(mc.cred);

2222

gnutls_global_deinit();

3203

2223

gnutls_dh_params_deinit(mc.dh_params);

3204

2224

}

3205

2225

3213

2233

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

3214

2234

while(mc.current_server != NULL){

3215

2235

server *next = mc.current_server->next;

3216

#ifdef __GNUC__

3217

#pragma GCC diagnostic push

3218

#pragma GCC diagnostic ignored "-Wcast-qual"

3219

#endif

3220

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

3221

#ifdef __GNUC__

3222

#pragma GCC diagnostic pop

3223

#endif

3224

2236

free(mc.current_server);

3225

2237

mc.current_server = next;

3226

2238

}

3227

2239

}

3228

2240

3229

/* Re-raise privileges */

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

3230

2245

{

3231

ret = raise_privileges();

3232

if(ret != 0){

3233

errno = ret;

3234

perror_plus("Failed to raise privileges");

3235

} else {

3236

3237

/* Run network hooks */

3238

run_network_hooks("stop", interfaces_hooks != NULL ?

3239

interfaces_hooks : "", delay);

3240

3241

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

3242

{

3243

char *interface = NULL;

3244

while((interface = argz_next(interfaces_to_take_down,

3245

interfaces_to_take_down_size,

3246

interface))){

3247

ret = take_down_interface(interface);

3248

if(ret != 0){

3249

errno = ret;

3250

perror_plus("Failed to take down interface");

3251

}

3252

}

3253

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

3254

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

3255

" down\n");

3256

}

3257

}

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

3258

2250

}

3259

2251

3260

ret = lower_privileges_permanently();

3261

if(ret != 0){

3262

errno = ret;

3263

perror_plus("Failed to lower privileges permanently");

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2262

}

2263

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2267

}

3264

2268

}

3265

2269

}

3266

3267

free(interfaces_to_take_down);

3268

free(interfaces_hooks);

3269

3270

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

3271

uintmax_t level){

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2276

2277

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

2278

if(tempdir_created){

3272

2279

struct dirent **direntries = NULL;

3273

int dret;

3274

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

3275

O_RDONLY

3276

| O_NOFOLLOW

3277

| O_DIRECTORY

3278

| O_PATH));

3279

if(dir_fd == -1){

3280

perror_plus("open");

3281

return;

3282

}

3283

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

3284

notdotentries, alphasort);

3285

if(numentries >= 0){

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

3286

2284

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

3287

if(debug){

3288

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

3289

dirname, direntries[i]->d_name);

3290

}

3291

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

3292

if(dret == -1){

3293

if(errno == EISDIR){

3294

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

3295

AT_REMOVEDIR);

3296

}

3297

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

3298

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

3299

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

3300

/* Recurse only in this special case */

3301

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

3302

dret = 0;

3303

}

3304

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

3305

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

3306

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

3307

}

3308

}

3309

free(direntries[i]);

3310

}

3311

3312

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

3313

free(direntries);

3314

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3315

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

3316

perror_plus("rmdir");

3317

}

3318

} else {

3319

perror_plus("scandirat");

3320

}

3321

close(dir_fd);

3322

}

3323

3324

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

3325

if(tempdir != NULL){

3326

clean_dir_at(-1, tempdir, 0);

2285

direntry = direntries[i];

2286

char *fullname = NULL;

2287

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

2288

direntry->d_name);

2289

if(ret < 0){

2290

perror_plus("asprintf");

2291

continue;

2292

}

2293

ret = remove(fullname);

2294

if(ret == -1){

2295

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

2296

strerror(errno));

2297

}

2298

free(fullname);

2299

}

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

2306

}

2307

ret = rmdir(tempdir);

2308

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

2309

perror_plus("rmdir");

2310

}

3327

2311

}

3328

2312

3329

2313

if(quit_now){