/mandos/trunk : revision 487

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause(), _exit() */

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setgid(), pause() */

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

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

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

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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

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init_gnutls_session(),

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109

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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128

static const char mandos_protocol_version[] = "1";

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

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

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

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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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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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146

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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server *current_server;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

202

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

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if(buffer == NULL){

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187

return buffer_capacity;

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}

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

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

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int af){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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int ret;

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

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if(new_server == NULL){

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196

perror_plus("malloc");

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return false;

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return -1;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

225

204

perror_plus("strdup");

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return false;

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return -1;

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}

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/* Special case of first server */

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/* unique case of first server */

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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

234

213

} else {

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new_server->next = mc.current_server;

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

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

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if(ret == -1){

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221

perror_plus("clock_gettime");

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return false;

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return -1;

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223

}

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return true;

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return 0;

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225

}

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226

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/*

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* Initialize GPGME.

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229

*/

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

252

const char *tempdir){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

257

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

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

279

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

308

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

321

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

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tempdir);

301

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

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return false;

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}

325

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326

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/* Create new GPGME "context" */

327

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

328

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if(rc != GPG_ERR_NO_ERROR){

329

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

330

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

331

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

332

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return false;

333

311

}

334

312

353

331

ssize_t plaintext_length = 0;

354

332

355

333

if(debug){

356

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

334

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

357

335

}

358

336

359

337

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

360

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

361

339

0);

362

340

if(rc != GPG_ERR_NO_ERROR){

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

365

343

return -1;

366

344

}

367

345

368

346

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

369

347

rc = gpgme_data_new(&dh_plain);

370

348

if(rc != GPG_ERR_NO_ERROR){

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

374

351

gpgme_data_release(dh_crypto);

375

352

return -1;

376

353

}

379

356

data buffer */

380

357

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

381

358

if(rc != GPG_ERR_NO_ERROR){

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

384

361

plaintext_length = -1;

385

362

if(debug){

386

363

gpgme_decrypt_result_t result;

387

364

result = gpgme_op_decrypt_result(mc.ctx);

388

365

if(result == NULL){

389

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

366

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

390

367

} else {

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

395

372

if(result->file_name != NULL){

396

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

373

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

397

374

}

398

375

gpgme_recipient_t recipient;

399

376

recipient = result->recipients;

400

377

while(recipient != NULL){

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

408

384

recipient = recipient->next;

409

385

}

410

386

}

413

389

}

414

390

415

391

if(debug){

416

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

392

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

417

393

}

418

394

419

395

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

426

402

*plaintext = NULL;

427

403

while(true){

428

404

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

431

407

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

435

411

}

436

412

437

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

426

}

451

427

452

428

if(debug){

453

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

429

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

454

430

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

455

431

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

456

432

}

468

444

}

469

445

470

446

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

447

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

448

-Wunreachable-code */

472

449

if(ret == NULL)

473

450

ret = "(unknown)";

474

451

return ret;

477

454

/* GnuTLS log function callback */

478

455

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

479

456

const char* string){

480

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

457

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

481

458

}

482

459

483

460

static int init_gnutls_global(const char *pubkeyfilename,

485

462

int ret;

486

463

487

464

if(debug){

488

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

465

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

489

466

}

490

467

491

468

ret = gnutls_global_init();

492

469

if(ret != GNUTLS_E_SUCCESS){

493

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

494

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

495

472

return -1;

496

473

}

497

474

506

483

/* OpenPGP credentials */

507

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

485

if(ret != GNUTLS_E_SUCCESS){

509

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

510

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

511

488

gnutls_global_deinit();

512

489

return -1;

513

490

}

514

491

515

492

if(debug){

516

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

517

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

518

pubkeyfilename,

519

seckeyfilename);

493

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

494

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

495

seckeyfilename);

520

496

}

521

497

522

498

ret = gnutls_certificate_set_openpgp_key_file

523

499

(mc.cred, pubkeyfilename, seckeyfilename,

524

500

GNUTLS_OPENPGP_FMT_BASE64);

525

501

if(ret != GNUTLS_E_SUCCESS){

526

fprintf_plus(stderr,

527

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

528

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

529

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

530

safer_gnutls_strerror(ret));

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

531

507

goto globalfail;

532

508

}

533

509

534

510

/* GnuTLS server initialization */

535

511

ret = gnutls_dh_params_init(&mc.dh_params);

536

512

if(ret != GNUTLS_E_SUCCESS){

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

513

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

514

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

540

515

goto globalfail;

541

516

}

542

517

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

543

518

if(ret != GNUTLS_E_SUCCESS){

544

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

545

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

546

521

goto globalfail;

547

522

}

548

523

568

543

}

569

544

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

570

545

if(ret != GNUTLS_E_SUCCESS){

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

574

548

}

575

549

576

550

{

583

557

}

584

558

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

585

559

if(ret != GNUTLS_E_SUCCESS){

586

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

587

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

588

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

589

563

gnutls_deinit(*session);

590

564

return -1;

591

565

}

600

574

}

601

575

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

602

576

if(ret != GNUTLS_E_SUCCESS){

603

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

604

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

605

579

gnutls_deinit(*session);

606

580

return -1;

607

581

}

619

593

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

620

594

621

595

/* Called when a Mandos server is found */

622

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

596

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

623

597

AvahiIfIndex if_index,

624

598

int af){

625

599

int ret, tcp_sd = -1;

652

626

pf = PF_INET;

653

627

break;

654

628

default:

655

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

629

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

656

630

errno = EINVAL;

657

631

return -1;

658

632

}

663

637

}

664

638

665

639

if(debug){

666

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

667

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

640

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

641

"\n", ip, port);

668

642

}

669

643

670

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

696

670

}

697

671

if(ret == 0){

698

672

int e = errno;

699

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

673

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

700

674

errno = e;

701

675

goto mandos_end;

702

676

}

703

677

if(af == AF_INET6){

704

to.in6.sin6_port = htons(port);

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

705

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

683

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

707

-Wunreachable-code*/

684

-Wunreachable-code*/

708

685

if(if_index == AVAHI_IF_UNSPEC){

709

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

710

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

711

688

errno = EINVAL;

712

689

goto mandos_end;

713

690

}

731

708

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

732

709

perror_plus("if_indextoname");

733

710

} else {

734

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

735

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

711

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

712

ip, interface, port);

736

713

}

737

714

} else {

738

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

739

ip, (uintmax_t)port);

715

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

716

port);

740

717

}

741

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

742

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

752

729

perror_plus("inet_ntop");

753

730

} else {

754

731

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

755

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

732

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

756

733

}

757

734

}

758

735

}

786

763

while(true){

787

764

size_t out_size = strlen(out);

788

765

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

789

out_size - written));

766

out_size - written));

790

767

if(ret == -1){

791

768

int e = errno;

792

769

perror_plus("write");

812

789

}

813

790

814

791

if(debug){

815

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

792

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

816

793

}

817

794

818

795

if(quit_now){

820

797

goto mandos_end;

821

798

}

822

799

823

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

824

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

825

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

826

gnutls_transport_set_ptr(session,

827

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

828

802

829

803

if(quit_now){

830

804

errno = EINTR;

841

815

842

816

if(ret != GNUTLS_E_SUCCESS){

843

817

if(debug){

844

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

818

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

845

819

gnutls_perror(ret);

846

820

}

847

821

errno = EPROTO;

851

825

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

852

826

853

827

if(debug){

854

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

855

" %s\n", ip);

828

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

829

ip);

856

830

}

857

831

858

832

while(true){

863

837

}

864

838

865

839

buffer_capacity = incbuffer(&buffer, buffer_length,

866

buffer_capacity);

840

buffer_capacity);

867

841

if(buffer_capacity == 0){

868

842

int e = errno;

869

843

perror_plus("incbuffer");

896

870

}

897

871

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

898

872

if(ret < 0){

899

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

900

"***\n");

873

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

901

874

gnutls_perror(ret);

902

875

errno = EPROTO;

903

876

goto mandos_end;

904

877

}

905

878

break;

906

879

default:

907

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

908

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

909

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

910

883

errno = EIO;

911

884

goto mandos_end;

916

889

}

917

890

918

891

if(debug){

919

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

892

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

920

893

}

921

894

922

895

if(quit_now){

934

907

935

908

if(buffer_length > 0){

936

909

ssize_t decrypted_buffer_size;

937

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

938

912

&decrypted_buffer);

939

913

if(decrypted_buffer_size >= 0){

940

914

951

925

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

952

926

int e = errno;

953

927

if(debug){

954

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

955

strerror(errno));

928

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

929

strerror(errno));

956

930

}

957

931

errno = e;

958

932

goto mandos_end;

1003

977

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1004

978

flags,

1005

979

AVAHI_GCC_UNUSED void* userdata){

1006

if(r == NULL){

1007

return;

1008

}

980

assert(r);

1009

981

1010

982

/* Called whenever a service has been resolved successfully or

1011

983

timed out */

1017

989

switch(event){

1018

990

default:

1019

991

case AVAHI_RESOLVER_FAILURE:

1020

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

1021

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

1022

domain,

1023

avahi_strerror(avahi_server_errno(mc.server)));

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1024

995

break;

1025

996

1026

997

case AVAHI_RESOLVER_FOUND:

1028

999

char ip[AVAHI_ADDRESS_STR_MAX];

1029

1000

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

1030

1001

if(debug){

1031

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

1032

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

1033

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

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1034

1005

}

1035

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

1036

interface,

1006

int ret = start_mandos_communication(ip, port, interface,

1037

1007

avahi_proto_to_af(proto));

1038

1008

if(ret == 0){

1039

avahi_simple_poll_quit(simple_poll);

1009

avahi_simple_poll_quit(mc.simple_poll);

1040

1010

} else {

1041

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

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1045

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1046

1013

}

1047

1014

}

1048

1015

}

1059

1026

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1027

flags,

1061

1028

AVAHI_GCC_UNUSED void* userdata){

1062

if(b == NULL){

1063

return;

1064

}

1029

assert(b);

1065

1030

1066

1031

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

1067

1032

is removed from the LAN */

1074

1039

default:

1075

1040

case AVAHI_BROWSER_FAILURE:

1076

1041

1077

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

1078

avahi_strerror(avahi_server_errno(mc.server)));

1079

avahi_simple_poll_quit(simple_poll);

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1080

1045

return;

1081

1046

1082

1047

case AVAHI_BROWSER_NEW:

1088

1053

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

1089

1054

name, type, domain, protocol, 0,

1090

1055

resolve_callback, NULL) == NULL)

1091

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

1092

" %s\n", name,

1093

avahi_strerror(avahi_server_errno(mc.server)));

1056

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

1057

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

1094

1058

break;

1095

1059

1096

1060

case AVAHI_BROWSER_REMOVE:

1099

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1100

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1101

1065

if(debug){

1102

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

1103

" searching...\n");

1066

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

1104

1067

}

1105

1068

break;

1106

1069

}

1115

1078

signal_received = sig;

1116

1079

int old_errno = errno;

1117

1080

/* set main loop to exit */

1118

if(simple_poll != NULL){

1119

avahi_simple_poll_quit(simple_poll);

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1120

1083

}

1121

1084

errno = old_errno;

1122

1085

}

1123

1086

1124

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

1125

int ret;

1126

error_t ret_errno;

1127

1128

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

1129

if(s < 0){

1130

ret_errno = errno;

1131

perror_plus("socket");

1132

errno = ret_errno;

1133

return false;

1134

}

1135

strcpy(ifr->ifr_name, ifname);

1136

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1137

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1138

1143

if(debug){

1139

ret_errno = errno;

1140

perror_plus("ioctl SIOCGIFFLAGS");

1141

errno = ret_errno;

1144

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

1145

flagstring, if_entry->d_name);

1142

1146

}

1143

return false;

1147

free(flagstring);

1148

return 0;

1144

1149

}

1145

return true;

1146

}

1147

1148

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

1149

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1150

1152

/* Reject the loopback device */

1151

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1152

1154

if(debug){

1153

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

1154

ifname);

1155

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

1156

if_entry->d_name);

1155

1157

}

1156

return false;

1158

return 0;

1157

1159

}

1158

1160

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

1159

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

1161

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

1160

1162

if(debug){

1161

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

1162

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

1163

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

1164

if_entry->d_name);

1163

1165

}

1164

return true;

1166

return 1;

1165

1167

}

1166

1168

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

1167

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

1169

if(not (flags & IFF_BROADCAST)){

1168

1170

if(debug){

1169

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1170

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

1171

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

1172

if_entry->d_name);

1171

1173

}

1172

return false;

1174

return 0;

1173

1175

}

1174

1176

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

1175

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1176

1178

if(debug){

1177

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

1178

ifname);

1179

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

1180

if_entry->d_name);

1179

1181

}

1180

return false;

1182

return 0;

1181

1183

}

1182

1183

1184

/* Accept this device */

1184

1185

if(debug){

1185

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

1186

}

1187

return true;

1188

}

1189

1190

/*

1191

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

1192

* corresponds to an acceptable network device.

1193

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

1194

*/

1195

int good_interface(const struct dirent *if_entry){

1196

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

1197

return 0;

1198

}

1199

1200

struct ifreq ifr;

1201

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

1202

if(debug){

1203

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

1204

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

1205

}

1206

return 0;

1207

}

1208

1209

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

1210

return 0;

1186

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

1187

if_entry->d_name);

1211

1188

}

1212

1189

return 1;

1213

1190

}

1214

1191

1215

/*

1216

* This function determines if a network interface is up.

1217

*/

1218

bool interface_is_up(const char *interface){

1219

struct ifreq ifr;

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return false;

1226

}

1227

1228

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

1229

}

1230

1231

/*

1232

* This function determines if a network interface is running

1233

*/

1234

bool interface_is_running(const char *interface){

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

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

1240

}

1241

return false;

1242

}

1243

1244

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

1245

}

1246

1247

1192

int notdotentries(const struct dirent *direntry){

1248

1193

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

1249

1194

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

1255

1200

return 1;

1256

1201

}

1257

1202

1258

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

1259

int runnable_hook(const struct dirent *direntry){

1260

int ret;

1261

size_t sret;

1262

struct stat st;

1263

1264

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

1265

/* Empty name? */

1266

return 0;

1267

}

1268

1269

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

1270

"abcdefghijklmnopqrstuvwxyz"

1271

"0123456789"

1272

"_-");

1273

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

1274

/* Contains non-allowed characters */

1275

if(debug){

1276

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

1277

direntry->d_name);

1278

}

1279

return 0;

1280

}

1281

1282

char *fullname = NULL;

1283

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

1284

if(ret < 0){

1285

perror_plus("asprintf");

1286

return 0;

1287

}

1288

1289

ret = stat(fullname, &st);

1290

if(ret == -1){

1291

if(debug){

1292

perror_plus("Could not stat hook");

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not a regular file */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

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

1305

/* Not executable */

1306

if(debug){

1307

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

1308

direntry->d_name);

1309

}

1310

return 0;

1311

}

1312

if(debug){

1313

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

1314

direntry->d_name);

1315

}

1316

return 1;

1317

}

1318

1319

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1320

1204

int ret;

1321

1205

struct timespec now;

1322

1206

struct timespec waited_time;

1323

1207

intmax_t block_time;

1324

1208

1325

1209

while(true){

1326

1210

if(mc.current_server == NULL){

1327

1211

if (debug){

1328

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

1329

" No timeout!\n");

1212

fprintf(stderr,

1213

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

1330

1214

}

1331

1215

ret = avahi_simple_poll_iterate(s, -1);

1332

1216

} else {

1333

1217

if (debug){

1334

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

1335

" it, or wait\n");

1218

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

1219

" or wait\n");

1336

1220

}

1337

1221

/* the current time */

1338

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1352

1236

block_time = ((retry_interval

1353

1237

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

1354

1238

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

1355

1239

1356

1240

if (debug){

1357

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

1358

block_time);

1241

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

1359

1242

}

1360

1243

1361

1244

if(block_time <= 0){

1362

1245

ret = start_mandos_communication(mc.current_server->ip,

1363

1246

mc.current_server->port,

1364

1247

mc.current_server->if_index,

1365

1248

mc.current_server->af);

1366

1249

if(ret == 0){

1367

avahi_simple_poll_quit(simple_poll);

1250

avahi_simple_poll_quit(mc.simple_poll);

1368

1251

return 0;

1369

1252

}

1370

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1381

1264

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

1382

1265

}

1383

1266

if(ret != 0){

1384

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

1267

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

1385

1268

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

1386

1269

}

1387

1270

}

1388

1271

}

1389

1272

}

1390

1273

1391

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

1392

error_t raise_privileges(void){

1393

error_t old_errno = errno;

1394

error_t ret_errno = 0;

1395

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

1396

ret_errno = errno;

1397

perror_plus("seteuid");

1398

}

1399

errno = old_errno;

1400

return ret_errno;

1401

}

1402

1403

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

1404

error_t raise_privileges_permanently(void){

1405

error_t old_errno = errno;

1406

error_t ret_errno = raise_privileges();

1407

if(ret_errno != 0){

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

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

1412

ret_errno = errno;

1413

perror_plus("seteuid");

1414

}

1415

errno = old_errno;

1416

return ret_errno;

1417

}

1418

1419

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

1420

error_t lower_privileges(void){

1421

error_t old_errno = errno;

1422

error_t ret_errno = 0;

1423

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

1424

ret_errno = errno;

1425

perror_plus("seteuid");

1426

}

1427

errno = old_errno;

1428

return ret_errno;

1429

}

1430

1431

/* Lower privileges permanently */

1432

error_t lower_privileges_permanently(void){

1433

error_t old_errno = errno;

1434

error_t ret_errno = 0;

1435

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

1436

ret_errno = errno;

1437

perror_plus("setuid");

1438

}

1439

errno = old_errno;

1440

return ret_errno;

1441

}

1442

1443

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

1444

const float delay){

1445

struct dirent **direntries;

1446

struct dirent *direntry;

1447

int ret;

1448

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

1449

alphasort);

1450

if(numhooks == -1){

1451

if(errno == ENOENT){

1452

if(debug){

1453

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

1454

" found\n", hookdir);

1455

}

1456

} else {

1457

perror_plus("scandir");

1458

}

1459

} else {

1460

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

1461

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

1462

direntry = direntries[i];

1463

char *fullname = NULL;

1464

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

1465

if(ret < 0){

1466

perror_plus("asprintf");

1467

continue;

1468

}

1469

if(debug){

1470

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

1471

direntry->d_name);

1472

}

1473

pid_t hook_pid = fork();

1474

if(hook_pid == 0){

1475

/* Child */

1476

/* Raise privileges */

1477

raise_privileges_permanently();

1478

/* Set group */

1479

errno = 0;

1480

ret = setgid(0);

1481

if(ret == -1){

1482

perror_plus("setgid");

1483

}

1484

/* Reset supplementary groups */

1485

errno = 0;

1486

ret = setgroups(0, NULL);

1487

if(ret == -1){

1488

perror_plus("setgroups");

1489

}

1490

dup2(devnull, STDIN_FILENO);

1491

close(devnull);

1492

dup2(STDERR_FILENO, STDOUT_FILENO);

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

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

1509

if(ret == -1){

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1513

char *delaystring;

1514

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

1515

if(ret == -1){

1516

perror_plus("asprintf");

1517

_exit(EX_OSERR);

1518

}

1519

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

1520

if(ret == -1){

1521

free(delaystring);

1522

perror_plus("setenv");

1523

_exit(EX_OSERR);

1524

}

1525

free(delaystring);

1526

if(connect_to != NULL){

1527

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

1528

if(ret == -1){

1529

perror_plus("setenv");

1530

_exit(EX_OSERR);

1531

}

1532

}

1533

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

1534

perror_plus("execl");

1535

_exit(EXIT_FAILURE);

1536

}

1537

} else {

1538

int status;

1539

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

1540

perror_plus("waitpid");

1541

free(fullname);

1542

continue;

1543

}

1544

if(WIFEXITED(status)){

1545

if(WEXITSTATUS(status) != 0){

1546

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

1547

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

1548

WEXITSTATUS(status));

1549

free(fullname);

1550

continue;

1551

}

1552

} else if(WIFSIGNALED(status)){

1553

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

1554

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

1555

WTERMSIG(status));

1556

free(fullname);

1557

continue;

1558

} else {

1559

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

1560

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

1561

free(fullname);

1562

continue;

1563

}

1564

}

1565

free(fullname);

1566

if(debug){

1567

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

1568

direntry->d_name);

1569

}

1570

}

1571

close(devnull);

1572

}

1573

return true;

1574

}

1575

1576

error_t bring_up_interface(const char *const interface,

1577

const float delay){

1578

int sd = -1;

1579

error_t old_errno = errno;

1580

error_t ret_errno = 0;

1581

int ret, ret_setflags;

1582

struct ifreq network;

1583

unsigned int if_index = if_nametoindex(interface);

1584

if(if_index == 0){

1585

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

1586

errno = old_errno;

1587

return ENXIO;

1588

}

1589

1590

if(quit_now){

1591

errno = old_errno;

1592

return EINTR;

1593

}

1594

1595

if(not interface_is_up(interface)){

1596

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

1597

ret_errno = errno;

1598

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

1599

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

1600

return ret_errno;

1601

}

1602

network.ifr_flags |= IFF_UP;

1603

1604

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1605

if(sd < 0){

1606

ret_errno = errno;

1607

perror_plus("socket");

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

if(quit_now){

1613

close(sd);

1614

errno = old_errno;

1615

return EINTR;

1616

}

1617

1618

if(debug){

1619

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

1620

interface);

1621

}

1622

1623

/* Raise priviliges */

1624

raise_privileges();

1625

1626

#ifdef __linux__

1627

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1628

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

1629

int ret_linux = klogctl(8, NULL, 5);

1630

bool restore_loglevel = true;

1631

if(ret_linux == -1){

1632

restore_loglevel = false;

1633

perror_plus("klogctl");

1634

}

1635

#endif /* __linux__ */

1636

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

1637

ret_errno = errno;

1638

#ifdef __linux__

1639

if(restore_loglevel){

1640

ret_linux = klogctl(7, NULL, 0);

1641

if(ret_linux == -1){

1642

perror_plus("klogctl");

1643

}

1644

}

1645

#endif /* __linux__ */

1646

1647

/* Lower privileges */

1648

lower_privileges();

1649

1650

/* Close the socket */

1651

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

1652

if(ret == -1){

1653

perror_plus("close");

1654

}

1655

1656

if(ret_setflags == -1){

1657

errno = ret_errno;

1658

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1659

errno = old_errno;

1660

return ret_errno;

1661

}

1662

} else if(debug){

1663

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

1664

interface);

1665

}

1666

1667

/* Sleep checking until interface is running.

1668

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

1669

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

1670

if(interface_is_running(interface)){

1671

break;

1672

}

1673

struct timespec sleeptime = { .tv_nsec = 250000000 };

1674

ret = nanosleep(&sleeptime, NULL);

1675

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

1676

perror_plus("nanosleep");

1677

}

1678

}

1679

1680

errno = old_errno;

1681

return 0;

1682

}

1683

1684

error_t take_down_interface(const char *const interface){

1685

int sd = -1;

1686

error_t old_errno = errno;

1687

error_t ret_errno = 0;

1688

int ret, ret_setflags;

1689

struct ifreq network;

1690

unsigned int if_index = if_nametoindex(interface);

1691

if(if_index == 0){

1692

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

1693

errno = old_errno;

1694

return ENXIO;

1695

}

1696

if(interface_is_up(interface)){

1697

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

1698

ret_errno = errno;

1699

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

1700

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

1701

return ret_errno;

1702

}

1703

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

1704

1705

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1706

if(sd < 0){

1707

ret_errno = errno;

1708

perror_plus("socket");

1709

errno = old_errno;

1710

return ret_errno;

1711

}

1712

1713

if(debug){

1714

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

1715

interface);

1716

}

1717

1718

/* Raise priviliges */

1719

raise_privileges();

1720

1721

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

1722

ret_errno = errno;

1723

1724

/* Lower privileges */

1725

lower_privileges();

1726

1727

/* Close the socket */

1728

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

1729

if(ret == -1){

1730

perror_plus("close");

1731

}

1732

1733

if(ret_setflags == -1){

1734

errno = ret_errno;

1735

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1736

errno = old_errno;

1737

return ret_errno;

1738

}

1739

} else if(debug){

1740

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

1741

interface);

1742

}

1743

1744

errno = old_errno;

1745

return 0;

1746

}

1747

1748

1274

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

1749

1275

AvahiSServiceBrowser *sb = NULL;

1750

error_t ret_errno;

1276

int error;

1751

1277

int ret;

1752

1278

intmax_t tmpmax;

1753

1279

char *tmp;

1754

1280

int exitcode = EXIT_SUCCESS;

1755

char *interfaces = NULL;

1756

size_t interfaces_size = 0;

1757

char *interfaces_to_take_down = NULL;

1758

size_t interfaces_to_take_down_size = 0;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1759

1287

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

1760

1288

bool tempdir_created = false;

1761

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1762

1290

const char *seckey = PATHDIR "/" SECKEY;

1763

1291

const char *pubkey = PATHDIR "/" PUBKEY;

1764

char *interfaces_hooks = NULL;

1765

size_t interfaces_hooks_size = 0;

1766

1292

1767

1293

bool gnutls_initialized = false;

1768

1294

bool gpgme_initialized = false;

1830

1356

.group = 2 },

1831

1357

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

1832

1358

.arg = "SECONDS",

1833

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

1834

.group = 2 },

1835

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

1836

.arg = "DIR",

1837

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

1359

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

1838

1360

.group = 2 },

1839

1361

/*

1840

1362

* These reproduce what we would get without ARGP_NO_HELP

1859

1381

connect_to = arg;

1860

1382

break;

1861

1383

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

1862

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1863

(int)',');

1864

if(ret_errno != 0){

1865

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

1866

}

1384

interface = arg;

1867

1385

break;

1868

1386

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

1869

1387

seckey = arg;

1893

1411

errno = 0;

1894

1412

retry_interval = strtod(arg, &tmp);

1895

1413

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

1896

or (retry_interval * 1000) > INT_MAX

1897

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1898

1415

argp_error(state, "Bad retry interval");

1899

1416

}

1900

1417

break;

1901

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

1902

hookdir = arg;

1903

break;

1904

1418

/*

1905

1419

* These reproduce what we would get without ARGP_NO_HELP

1906

1420

*/

1912

1426

argp_state_help(state, state->out_stream,

1913

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1914

1428

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

1915

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

1429

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

1916

1430

exit(argp_err_exit_status);

1917

1431

break;

1918

1432

default:

1945

1459

{

1946

1460

/* Work around Debian bug #633582:

1947

1461

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

1462

struct stat st;

1948

1463

1949

1464

/* Re-raise priviliges */

1950

if(raise_privileges() == 0){

1951

struct stat st;

1952

1953

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

1954

int seckey_fd = open(seckey, O_RDONLY);

1955

if(seckey_fd == -1){

1956

perror_plus("open");

1957

} else {

1958

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

1959

if(ret == -1){

1960

perror_plus("fstat");

1961

} else {

1962

if(S_ISREG(st.st_mode)

1963

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

1964

ret = fchown(seckey_fd, uid, gid);

1965

if(ret == -1){

1966

perror_plus("fchown");

1967

}

1968

}

1969

}

1970

TEMP_FAILURE_RETRY(close(seckey_fd));

1971

}

1972

}

1973

1974

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

1975

int pubkey_fd = open(pubkey, O_RDONLY);

1976

if(pubkey_fd == -1){

1977

perror_plus("open");

1978

} else {

1979

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

1980

if(ret == -1){

1981

perror_plus("fstat");

1982

} else {

1983

if(S_ISREG(st.st_mode)

1984

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

1985

ret = fchown(pubkey_fd, uid, gid);

1986

if(ret == -1){

1987

perror_plus("fchown");

1988

}

1989

}

1990

}

1991

TEMP_FAILURE_RETRY(close(pubkey_fd));

1992

}

1993

}

1994

1995

/* Lower privileges */

1996

errno = 0;

1997

ret = seteuid(uid);

1998

if(ret == -1){

1999

perror_plus("seteuid");

2000

}

2001

}

2002

}

2003

2004

/* Remove empty interface names */

2005

{

2006

char *interface = NULL;

2007

while((interface = argz_next(interfaces, interfaces_size,

2008

interface))){

2009

if(if_nametoindex(interface) == 0){

2010

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2011

fprintf_plus(stderr, "Not using nonexisting interface"

2012

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

2013

}

2014

argz_delete(&interfaces, &interfaces_size, interface);

2015

interface = NULL;

2016

}

2017

}

2018

}

2019

2020

/* Run network hooks */

2021

{

2022

2023

if(interfaces != NULL){

2024

interfaces_hooks = malloc(interfaces_size);

2025

if(interfaces_hooks == NULL){

2026

perror_plus("malloc");

2027

goto end;

2028

}

2029

memcpy(interfaces_hooks, interfaces, interfaces_size);

2030

interfaces_hooks_size = interfaces_size;

2031

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2032

(int)',');

2033

}

2034

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2035

interfaces_hooks : "", delay)){

2036

goto end;

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

2037

1512

}

2038

1513

}

2039

1514

2040

1515

if(not debug){

2041

1516

avahi_set_log_function(empty_log);

2042

1517

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

2043

1543

2044

1544

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

2045

1545

from the signal handler */

2046

1546

/* Initialize the pseudo-RNG for Avahi */

2047

1547

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

2048

simple_poll = avahi_simple_poll_new();

2049

if(simple_poll == NULL){

2050

fprintf_plus(stderr,

2051

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

1548

mc.simple_poll = avahi_simple_poll_new();

1549

if(mc.simple_poll == NULL){

1550

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

2052

1551

exitcode = EX_UNAVAILABLE;

2053

1552

goto end;

2054

1553

}

2116

1615

}

2117

1616

}

2118

1617

2119

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

2120

if(interfaces == NULL){

2121

struct dirent **direntries;

2122

/* Look for any good interfaces */

2123

ret = scandir(sys_class_net, &direntries, good_interface,

2124

alphasort);

2125

if(ret >= 1){

2126

/* Add all found interfaces to interfaces list */

2127

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

2128

ret_errno = argz_add(&interfaces, &interfaces_size,

2129

direntries[i]->d_name);

2130

if(ret_errno != 0){

2131

perror_plus("argz_add");

2132

continue;

2133

}

2134

if(debug){

2135

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

2136

direntries[i]->d_name);

2137

}

2138

}

2139

free(direntries);

1618

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

1619

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

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

if(if_index == 0){

1622

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

1623

exitcode = EX_UNAVAILABLE;

1624

goto end;

1625

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

#ifdef __linux__

1639

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1641

ret = klogctl(8, NULL, 5);

1642

bool restore_loglevel = true;

1643

if(ret == -1){

1644

restore_loglevel = false;

1645

perror_plus("klogctl");

1646

}

1647

#endif /* __linux__ */

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1653

#ifdef __linux__

1654

if(restore_loglevel){

1655

ret = klogctl(7, NULL, 0);

1656

if(ret == -1){

1657

perror_plus("klogctl");

1658

}

1659

}

1660

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

goto end;

1668

}

1669

strcpy(network.ifr_name, interface);

1670

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

1671

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1673

#ifdef __linux__

1674

if(restore_loglevel){

1675

ret = klogctl(7, NULL, 0);

1676

if(ret == -1){

1677

perror_plus("klogctl");

1678

}

1679

}

1680

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1688

goto end;

1689

}

1690

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

1691

network.ifr_flags |= IFF_UP;

1692

take_down_interface = true;

1693

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

1694

if(ret == -1){

1695

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1698

#ifdef __linux__

1699

if(restore_loglevel){

1700

ret = klogctl(7, NULL, 0);

1701

if(ret == -1){

1702

perror_plus("klogctl");

1703

}

1704

}

1705

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

goto end;

1713

}

1714

}

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

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

1719

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1721

} else if(network.ifr_flags & IFF_RUNNING){

1722

break;

1723

}

1724

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

ret = nanosleep(&sleeptime, NULL);

1726

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

1727

perror_plus("nanosleep");

1728

}

1729

}

1730

if(not take_down_interface){

1731

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

1732

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

1733

if(ret == -1){

1734

perror_plus("close");

1735

}

1736

}

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

/* Restores kernel loglevel to default */

1740

ret = klogctl(7, NULL, 0);

1741

if(ret == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

2140

1754

} else {

2141

free(direntries);

2142

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

2143

exitcode = EXIT_FAILURE;

2144

goto end;

2145

}

2146

}

2147

2148

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

2149

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

2150

if(debug){

2151

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

2152

interfaces);

2153

}

2154

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2155

}

2156

2157

/* Bring up interfaces which are down */

2158

if(not (argz_count(interfaces, interfaces_size) == 1

2159

and strcmp(interfaces, "none") == 0)){

2160

char *interface = NULL;

2161

while((interface = argz_next(interfaces, interfaces_size,

2162

interface))){

2163

bool interface_was_up = interface_is_up(interface);

2164

ret = bring_up_interface(interface, delay);

2165

if(not interface_was_up){

2166

if(ret != 0){

2167

errno = ret;

2168

perror_plus("Failed to bring up interface");

2169

} else {

2170

ret_errno = argz_add(&interfaces_to_take_down,

2171

&interfaces_to_take_down_size,

2172

interface);

2173

}

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

2174

1759

}

2175

1760

}

2176

free(interfaces);

2177

interfaces = NULL;

2178

interfaces_size = 0;

2179

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

2180

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

2181

}

2182

1761

}

2183

1762

2184

1763

if(quit_now){

2187

1766

2188

1767

ret = init_gnutls_global(pubkey, seckey);

2189

1768

if(ret == -1){

2190

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

1769

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

2191

1770

exitcode = EX_UNAVAILABLE;

2192

1771

goto end;

2193

1772

} else {

2209

1788

}

2210

1789

2211

1790

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

2212

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

1791

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

2213

1792

exitcode = EX_UNAVAILABLE;

2214

1793

goto end;

2215

1794

} else {

2224

1803

/* Connect directly, do not use Zeroconf */

2225

1804

/* (Mainly meant for debugging) */

2226

1805

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

2227

2228

1806

if(address == NULL){

2229

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

1807

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

2230

1808

exitcode = EX_USAGE;

2231

1809

goto end;

2232

1810

}

2235

1813

goto end;

2236

1814

}

2237

1815

2238

in_port_t port;

1816

uint16_t port;

2239

1817

errno = 0;

2240

1818

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

2241

1819

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

2242

or tmpmax != (in_port_t)tmpmax){

2243

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

1820

or tmpmax != (uint16_t)tmpmax){

1821

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

2244

1822

exitcode = EX_USAGE;

2245

1823

goto end;

2246

1824

}

2249

1827

goto end;

2250

1828

}

2251

1829

2252

port = (in_port_t)tmpmax;

1830

port = (uint16_t)tmpmax;

2253

1831

*address = '\0';

1832

address = connect_to;

2254

1833

/* Colon in address indicates IPv6 */

2255

1834

int af;

2256

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

1835

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

2257

1836

af = AF_INET6;

2258

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

2259

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

2260

{

2261

connect_to++;

2262

address[-1] = '\0';

2263

}

2264

1837

} else {

2265

1838

af = AF_INET;

2266

1839

}

2267

address = connect_to;

2268

1840

2269

1841

if(quit_now){

2270

1842

goto end;

2271

1843

}

2272

1844

2273

1845

while(not quit_now){

2274

1846

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

2275

1847

if(quit_now or ret == 0){

2276

1848

break;

2277

1849

}

2278

if(debug){

2279

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

2280

(int)retry_interval);

2281

}

2282

sleep((int)retry_interval);

2283

}

2284

1850

sleep((int)retry_interval or 1);

1851

};

1852

2285

1853

if (not quit_now){

2286

1854

exitcode = EXIT_SUCCESS;

2287

1855

}

2288

1856

2289

1857

goto end;

2290

1858

}

2291

1859

2303

1871

config.publish_domain = 0;

2304

1872

2305

1873

/* Allocate a new server */

2306

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2307

&config, NULL, NULL, &ret_errno);

1874

mc.server = avahi_server_new(avahi_simple_poll_get

1875

(mc.simple_poll), &config, NULL,

1876

NULL, &error);

2308

1877

2309

1878

/* Free the Avahi configuration data */

2310

1879

avahi_server_config_free(&config);

2312

1881

2313

1882

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

2314

1883

if(mc.server == NULL){

2315

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

2316

avahi_strerror(ret_errno));

1884

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

1885

avahi_strerror(error));

2317

1886

exitcode = EX_UNAVAILABLE;

2318

1887

goto end;

2319

1888

}

2327

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2328

1897

NULL, 0, browse_callback, NULL);

2329

1898

if(sb == NULL){

2330

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

2331

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2332

1901

exitcode = EX_UNAVAILABLE;

2333

1902

goto end;

2334

1903

}

2340

1909

/* Run the main loop */

2341

1910

2342

1911

if(debug){

2343

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

1912

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

2344

1913

}

2345

1914

2346

ret = avahi_loop_with_timeout(simple_poll,

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

2347

1916

(int)(retry_interval * 1000));

2348

1917

if(debug){

2349

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

2350

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

1918

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

1919

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

2351

1920

}

2352

1921

2353

1922

end:

2354

1923

2355

1924

if(debug){

2356

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

1925

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

2357

1926

}

2358

1927

2359

1928

/* Cleanup things */

2363

1932

if(mc.server != NULL)

2364

1933

avahi_server_free(mc.server);

2365

1934

2366

if(simple_poll != NULL)

2367

avahi_simple_poll_free(simple_poll);

1935

if(mc.simple_poll != NULL)

1936

avahi_simple_poll_free(mc.simple_poll);

2368

1937

2369

1938

if(gnutls_initialized){

2370

1939

gnutls_certificate_free_credentials(mc.cred);

2375

1944

if(gpgme_initialized){

2376

1945

gpgme_release(mc.ctx);

2377

1946

}

2378

1947

2379

1948

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

2380

1949

has seen */

2381

1950

if(mc.current_server != NULL){

2387

1956

}

2388

1957

}

2389

1958

2390

/* Re-raise priviliges */

2391

{

2392

raise_privileges();

2393

2394

/* Run network hooks */

2395

run_network_hooks("stop", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

2397

2398

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

2399

{

2400

char *interface = NULL;

2401

while((interface=argz_next(interfaces_to_take_down,

2402

interfaces_to_take_down_size,

2403

interface))){

2404

ret_errno = take_down_interface(interface);

2405

if(ret_errno != 0){

2406

errno = ret_errno;

2407

perror_plus("Failed to take down interface");

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

1966

}

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2408

1976

}

2409

1977

}

2410

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

2411

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

2412

" down\n");

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

2413

1987

}

2414

1988

}

2415

2416

lower_privileges_permanently();

2417

1989

}

2418

1990

2419

free(interfaces_to_take_down);

2420

free(interfaces_hooks);

2421

2422

1991

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

2423

1992

if(tempdir_created){

2424

1993

struct dirent **direntries = NULL;

2425

1994

struct dirent *direntry = NULL;

2426

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

2427

alphasort);

2428

if (numentries > 0){

2429

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

1995

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

1996

if (ret > 0){

1997

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

2430

1998

direntry = direntries[i];

2431

1999

char *fullname = NULL;

2432

2000

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

2437

2005

}

2438

2006

ret = remove(fullname);

2439

2007

if(ret == -1){

2440

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

2441

strerror(errno));

2008

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

2009

strerror(errno));

2442

2010

}

2443

2011

free(fullname);

2444

2012

}

2445

2013

}

2446

2014

2447

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

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2448

2017

free(direntries);

2449

if (numentries == -1){

2018

if (ret == -1){

2450

2019

perror_plus("scandir");

2451

2020

}

2452

2021

ret = rmdir(tempdir);