/mandos/release : revision 237.7.156

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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@fukt.bsnet.se>.

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

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stdout, ferror(), remove() */

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

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

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

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

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srand(), strtof() */

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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> /* memset(), strcmp(), strlen(),

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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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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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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*/

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

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

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setgid() */

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

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

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

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

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

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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#include <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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114

init_gnutls_session(),

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115

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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129

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

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130

#define SECKEY "seckey.txt"

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131

#define PUBKEY "pubkey.txt"

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

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133

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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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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159

unsigned int dh_bits;

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gnutls_dh_params_t dh_params;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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AvahiSimplePoll *simple_poll;

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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 */

175

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;

186

va_start (ap, format);

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188

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

189

program_invocation_short_name));

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

191

}

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/*

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

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* "buffer_length" is how much is already used.

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197

*/

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198

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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200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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201

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

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202

if(buffer == NULL){

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207

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, server **current_server){

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int ret;

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

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if(new_server == NULL){

216

perror_plus("malloc");

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return false;

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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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if(new_server->ip == NULL){

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perror_plus("strdup");

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return false;

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}

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/* Special case of first server */

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if(*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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*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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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

return true;

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}

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/*

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* Initialize GPGME.

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249

*/

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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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int ret;

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

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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257

*/

175

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bool import_key(const char *filename){

259

int ret;

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int fd;

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gpgme_data_t pgp_data;

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

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264

if(fd == -1){

181

perror("open");

265

perror_plus("open");

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266

return false;

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267

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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270

if(rc != GPG_ERR_NO_ERROR){

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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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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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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

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

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if(ret == -1){

201

perror("close");

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perror_plus("close");

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}

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gpgme_data_release(pgp_data);

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return true;

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}

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if(debug){

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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return false;

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302

}

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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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305

rc = gpgme_get_engine_info(&engine_info);

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306

if(rc != GPG_ERR_NO_ERROR){

223

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

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gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

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309

return false;

226

310

}

227

311

while(engine_info != NULL){

233

317

engine_info = engine_info->next;

234

318

}

235

319

if(engine_info == NULL){

236

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

320

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

321

tempdir);

237

322

return false;

238

323

}

239

324

240

325

/* Create new GPGME "context" */

241

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

326

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

242

327

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

245

331

return false;

246

332

}

247

333

258

344

*/

259

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

260

346

size_t crypto_size,

261

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

262

349

gpgme_data_t dh_crypto, dh_plain;

263

350

gpgme_error_t rc;

264

351

ssize_t ret;

266

353

ssize_t plaintext_length = 0;

267

354

268

355

if(debug){

269

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

356

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

270

357

}

271

358

272

359

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

273

360

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

361

0);

275

362

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

278

365

return -1;

279

366

}

280

367

281

368

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

282

369

rc = gpgme_data_new(&dh_plain);

283

370

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

286

374

gpgme_data_release(dh_crypto);

287

375

return -1;

288

376

}

289

377

290

378

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

291

379

data buffer */

292

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

380

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

293

381

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

296

384

plaintext_length = -1;

297

385

if(debug){

298

386

gpgme_decrypt_result_t result;

299

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

300

388

if(result == NULL){

301

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

389

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

302

390

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

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);

307

395

if(result->file_name != NULL){

308

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

396

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

309

397

}

310

398

gpgme_recipient_t recipient;

311

399

recipient = result->recipients;

312

400

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

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");

319

408

recipient = recipient->next;

320

409

}

321

410

}

324

413

}

325

414

326

415

if(debug){

327

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

416

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

328

417

}

329

418

330

419

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

331

420

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

332

perror("gpgme_data_seek");

421

perror_plus("gpgme_data_seek");

333

422

plaintext_length = -1;

334

423

goto decrypt_end;

335

424

}

337

426

*plaintext = NULL;

338

427

while(true){

339

428

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

342

431

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

346

435

}

347

436

348

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

442

break;

354

443

}

355

444

if(ret < 0){

356

perror("gpgme_data_read");

445

perror_plus("gpgme_data_read");

357

446

plaintext_length = -1;

358

447

goto decrypt_end;

359

448

}

361

450

}

362

451

363

452

if(debug){

364

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

453

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

365

454

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

366

455

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

367

456

}

379

468

}

380

469

381

470

static const char * safer_gnutls_strerror(int value){

382

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

383

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

384

472

if(ret == NULL)

385

473

ret = "(unknown)";

386

474

return ret;

389

477

/* GnuTLS log function callback */

390

478

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

391

479

const char* string){

392

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

480

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

393

481

}

394

482

395

483

static int init_gnutls_global(const char *pubkeyfilename,

396

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

397

486

int ret;

398

487

399

488

if(debug){

400

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

489

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

401

490

}

402

491

403

492

ret = gnutls_global_init();

404

493

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

494

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

495

safer_gnutls_strerror(ret));

407

496

return -1;

408

497

}

409

498

416

505

}

417

506

418

507

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

420

509

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

510

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

511

safer_gnutls_strerror(ret));

426

512

gnutls_global_deinit();

427

513

return -1;

428

514

}

429

515

430

516

if(debug){

431

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

432

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

433

seckeyfilename);

517

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

434

521

}

435

522

436

523

ret = gnutls_certificate_set_openpgp_key_file

437

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

438

525

GNUTLS_OPENPGP_FMT_BASE64);

439

526

if(ret != GNUTLS_E_SUCCESS){

440

fprintf(stderr,

441

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

442

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

443

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

444

safer_gnutls_strerror(ret));

527

fprintf_plus(stderr,

528

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

529

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

530

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

531

safer_gnutls_strerror(ret));

445

532

goto globalfail;

446

533

}

447

534

448

535

/* GnuTLS server initialization */

449

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

450

537

if(ret != GNUTLS_E_SUCCESS){

451

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

452

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

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

453

541

goto globalfail;

454

542

}

455

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

543

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

456

544

if(ret != GNUTLS_E_SUCCESS){

457

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

458

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

459

547

goto globalfail;

460

548

}

461

549

462

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

463

551

464

552

return 0;

465

553

466

554

globalfail:

467

555

468

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

469

557

gnutls_global_deinit();

470

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

471

559

return -1;

472

560

}

473

561

474

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

475

564

int ret;

476

565

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

566

do {

567

ret = gnutls_init(session, GNUTLS_SERVER);

568

if(quit_now){

569

return -1;

570

}

571

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

478

572

if(ret != GNUTLS_E_SUCCESS){

479

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

480

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

481

576

}

482

577

483

578

{

484

579

const char *err;

485

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

580

do {

581

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

582

if(quit_now){

583

gnutls_deinit(*session);

584

return -1;

585

}

586

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

486

587

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

safer_gnutls_strerror(ret));

588

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

589

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

590

safer_gnutls_strerror(ret));

490

591

gnutls_deinit(*session);

491

592

return -1;

492

593

}

493

594

}

494

595

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

596

do {

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

599

if(quit_now){

600

gnutls_deinit(*session);

601

return -1;

602

}

603

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

497

604

if(ret != GNUTLS_E_SUCCESS){

498

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

499

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

500

607

gnutls_deinit(*session);

501

608

return -1;

502

609

}

503

610

504

611

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

613

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

509

615

510

616

return 0;

511

617

}

514

620

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

515

621

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

516

622

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

623

/* Called when a Mandos server is found */

521

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

624

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

522

625

AvahiIfIndex if_index,

523

int af){

626

int af, mandos_context *mc){

524

627

int ret, tcp_sd = -1;

525

628

ssize_t sret;

526

629

union {

528

631

struct sockaddr_in6 in6;

529

632

} to;

530

633

char *buffer = NULL;

531

char *decrypted_buffer;

634

char *decrypted_buffer = NULL;

532

635

size_t buffer_length = 0;

533

636

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

535

637

size_t written;

536

int retval = 0;

638

int retval = -1;

537

639

gnutls_session_t session;

538

640

int pf; /* Protocol family */

539

641

642

errno = 0;

643

540

644

if(quit_now){

645

errno = EINTR;

541

646

return -1;

542

647

}

543

648

549

654

pf = PF_INET;

550

655

break;

551

656

default:

552

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

657

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

658

errno = EINVAL;

553

659

return -1;

554

660

}

555

661

556

ret = init_gnutls_session(&session);

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

557

695

if(ret != 0){

558

696

return -1;

559

697

}

560

698

561

699

if(debug){

562

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

563

"\n", ip, port);

700

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

701

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

564

702

}

565

703

566

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

705

if(tcp_sd < 0){

568

perror("socket");

569

retval = -1;

706

int e = errno;

707

perror_plus("socket");

708

errno = e;

570

709

goto mandos_end;

571

710

}

572

711

573

712

if(quit_now){

713

errno = EINTR;

574

714

goto mandos_end;

575

715

}

576

716

583

723

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

584

724

}

585

725

if(ret < 0 ){

586

perror("inet_pton");

587

retval = -1;

726

int e = errno;

727

perror_plus("inet_pton");

728

errno = e;

588

729

goto mandos_end;

589

730

}

590

731

if(ret == 0){

591

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

592

retval = -1;

732

int e = errno;

733

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

734

errno = e;

593

735

goto mandos_end;

594

736

}

595

737

if(af == AF_INET6){

596

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

597

-Wconversion and

598

-Wunreachable-code */

599

738

to.in6.sin6_port = htons(port);

600

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

601

740

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

602

-Wunreachable-code*/

741

-Wunreachable-code*/

603

742

if(if_index == AVAHI_IF_UNSPEC){

604

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

605

" without a network interface\n");

606

retval = -1;

743

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

744

" incomplete without a network interface\n");

745

errno = EINVAL;

607

746

goto mandos_end;

608

747

}

609

748

/* Set the network interface number as scope */

616

755

}

617

756

618

757

if(quit_now){

758

errno = EINTR;

619

759

goto mandos_end;

620

760

}

621

761

623

763

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

624

764

char interface[IF_NAMESIZE];

625

765

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

626

perror("if_indextoname");

766

perror_plus("if_indextoname");

627

767

} else {

628

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

629

ip, interface, port);

768

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

769

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

630

770

}

631

771

} else {

632

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

633

port);

772

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

773

ip, (uintmax_t)port);

634

774

}

635

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

636

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

643

783

sizeof(addrstr));

644

784

}

645

785

if(pcret == NULL){

646

perror("inet_ntop");

786

perror_plus("inet_ntop");

647

787

} else {

648

788

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

649

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

789

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

650

790

}

651

791

}

652

792

}

653

793

654

794

if(quit_now){

795

errno = EINTR;

655

796

goto mandos_end;

656

797

}

657

798

661

802

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

662

803

}

663

804

if(ret < 0){

664

perror("connect");

665

retval = -1;

805

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

806

int e = errno;

807

perror_plus("connect");

808

errno = e;

809

}

666

810

goto mandos_end;

667

811

}

668

812

669

813

if(quit_now){

814

errno = EINTR;

670

815

goto mandos_end;

671

816

}

672

817

675

820

while(true){

676

821

size_t out_size = strlen(out);

677

822

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

678

out_size - written));

823

out_size - written));

679

824

if(ret == -1){

680

perror("write");

681

retval = -1;

825

int e = errno;

826

perror_plus("write");

827

errno = e;

682

828

goto mandos_end;

683

829

}

684

830

written += (size_t)ret;

694

840

}

695

841

696

842

if(quit_now){

843

errno = EINTR;

697

844

goto mandos_end;

698

845

}

699

846

}

700

847

701

848

if(debug){

702

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

703

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

708

709

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

711

if(quit_now){

712

goto mandos_end;

713

}

714

715

do{

849

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

850

}

851

852

if(quit_now){

853

errno = EINTR;

854

goto mandos_end;

855

}

856

857

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

858

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

859

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

860

gnutls_transport_set_ptr(session,

861

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

862

863

if(quit_now){

864

errno = EINTR;

865

goto mandos_end;

866

}

867

868

do {

716

869

ret = gnutls_handshake(session);

717

870

if(quit_now){

871

errno = EINTR;

718

872

goto mandos_end;

719

873

}

720

874

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

721

875

722

876

if(ret != GNUTLS_E_SUCCESS){

723

877

if(debug){

724

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

878

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

725

879

gnutls_perror(ret);

726

880

}

727

retval = -1;

881

errno = EPROTO;

728

882

goto mandos_end;

729

883

}

730

884

731

885

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

732

886

733

887

if(debug){

734

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

735

ip);

888

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

889

" %s\n", ip);

736

890

}

737

891

738

892

while(true){

739

893

740

894

if(quit_now){

895

errno = EINTR;

741

896

goto mandos_end;

742

897

}

743

898

744

899

buffer_capacity = incbuffer(&buffer, buffer_length,

745

buffer_capacity);

900

buffer_capacity);

746

901

if(buffer_capacity == 0){

747

perror("incbuffer");

748

retval = -1;

902

int e = errno;

903

perror_plus("incbuffer");

904

errno = e;

749

905

goto mandos_end;

750

906

}

751

907

752

908

if(quit_now){

909

errno = EINTR;

753

910

goto mandos_end;

754

911

}

755

912

764

921

case GNUTLS_E_AGAIN:

765

922

break;

766

923

case GNUTLS_E_REHANDSHAKE:

767

do{

924

do {

768

925

ret = gnutls_handshake(session);

769

926

770

927

if(quit_now){

928

errno = EINTR;

771

929

goto mandos_end;

772

930

}

773

931

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

774

932

if(ret < 0){

775

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

933

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

934

"***\n");

776

935

gnutls_perror(ret);

777

retval = -1;

936

errno = EPROTO;

778

937

goto mandos_end;

779

938

}

780

939

break;

781

940

default:

782

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

783

" encrypted session with Mandos server\n");

784

retval = -1;

941

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

942

" encrypted session with Mandos server\n");

785

943

gnutls_bye(session, GNUTLS_SHUT_RDWR);

944

errno = EIO;

786

945

goto mandos_end;

787

946

}

788

947

} else {

791

950

}

792

951

793

952

if(debug){

794

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

795

}

796

797

if(quit_now){

798

goto mandos_end;

799

}

800

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

803

if(quit_now){

804

goto mandos_end;

805

}

953

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

954

}

955

956

if(quit_now){

957

errno = EINTR;

958

goto mandos_end;

959

}

960

961

do {

962

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

963

if(quit_now){

964

errno = EINTR;

965

goto mandos_end;

966

}

967

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

806

968

807

969

if(buffer_length > 0){

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

buffer_length,

810

&decrypted_buffer);

970

ssize_t decrypted_buffer_size;

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

811

973

if(decrypted_buffer_size >= 0){

974

812

975

written = 0;

813

976

while(written < (size_t) decrypted_buffer_size){

814

977

if(quit_now){

978

errno = EINTR;

815

979

goto mandos_end;

816

980

}

817

981

819

983

(size_t)decrypted_buffer_size - written,

820

984

stdout);

821

985

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

986

int e = errno;

822

987

if(debug){

823

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

824

strerror(errno));

988

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

989

strerror(errno));

825

990

}

826

retval = -1;

827

break;

991

errno = e;

992

goto mandos_end;

828

993

}

829

994

written += (size_t)ret;

830

995

}

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

996

retval = 0;

834

997

}

835

} else {

836

retval = -1;

837

998

}

838

999

839

1000

/* Shutdown procedure */

840

1001

841

1002

mandos_end:

842

free(buffer);

843

if(tcp_sd >= 0){

844

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

845

}

846

if(ret == -1){

847

perror("close");

848

}

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

1003

{

1004

int e = errno;

1005

free(decrypted_buffer);

1006

free(buffer);

1007

if(tcp_sd >= 0){

1008

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

1009

}

1010

if(ret == -1){

1011

if(e == 0){

1012

e = errno;

1013

}

1014

perror_plus("close");

1015

}

1016

gnutls_deinit(session);

1017

errno = e;

1018

if(quit_now){

1019

errno = EINTR;

1020

retval = -1;

1021

}

852

1022

}

853

1023

return retval;

854

1024

}

866

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

867

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

868

1038

flags,

869

AVAHI_GCC_UNUSED void* userdata){

870

assert(r);

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

871

1043

872

1044

/* Called whenever a service has been resolved successfully or

873

1045

timed out */

879

1051

switch(event){

880

1052

default:

881

1053

case AVAHI_RESOLVER_FAILURE:

882

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

883

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

884

avahi_strerror(avahi_server_errno(mc.server)));

1054

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

1055

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

1056

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

885

1059

break;

886

1060

887

1061

case AVAHI_RESOLVER_FOUND:

889

1063

char ip[AVAHI_ADDRESS_STR_MAX];

890

1064

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

891

1065

if(debug){

892

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

893

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

894

ip, (intmax_t)interface, port);

1066

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

1067

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

1068

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

895

1069

}

896

int ret = start_mandos_communication(ip, port, interface,

897

avahi_proto_to_af(proto));

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

898

1074

if(ret == 0){

899

avahi_simple_poll_quit(mc.simple_poll);

1075

avahi_simple_poll_quit(simple_poll);

1076

} else {

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1080

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

1081

" list\n", name);

1082

}

900

1083

}

901

1084

}

902

1085

}

912

1095

const char *domain,

913

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

914

1097

flags,

915

AVAHI_GCC_UNUSED void* userdata){

916

assert(b);

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

917

1102

918

1103

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

919

1104

is removed from the LAN */

926

1111

default:

927

1112

case AVAHI_BROWSER_FAILURE:

928

1113

929

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

930

avahi_strerror(avahi_server_errno(mc.server)));

931

avahi_simple_poll_quit(mc.simple_poll);

1114

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

932

1118

return;

933

1119

934

1120

case AVAHI_BROWSER_NEW:

937

1123

the callback function is called the Avahi server will free the

938

1124

resolver for us. */

939

1125

940

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

941

name, type, domain, protocol, 0,

942

resolve_callback, NULL) == NULL)

943

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

944

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

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1130

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

1131

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

945

1134

break;

946

1135

947

1136

case AVAHI_BROWSER_REMOVE:

950

1139

case AVAHI_BROWSER_ALL_FOR_NOW:

951

1140

case AVAHI_BROWSER_CACHE_EXHAUSTED:

952

1141

if(debug){

953

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

1142

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

1143

" searching...\n");

954

1144

}

955

1145

break;

956

1146

}

957

1147

}

958

1148

959

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

1149

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

960

1150

static void handle_sigterm(int sig){

961

1151

if(quit_now){

962

1152

return;

964

1154

quit_now = 1;

965

1155

signal_received = sig;

966

1156

int old_errno = errno;

967

if(mc.simple_poll != NULL){

968

avahi_simple_poll_quit(mc.simple_poll);

969

}

970

errno = old_errno;

1157

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1160

}

1161

errno = old_errno;

1162

}

1163

1164

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

1165

int ret;

1166

error_t ret_errno;

1167

1168

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

1169

if(s < 0){

1170

ret_errno = errno;

1171

perror_plus("socket");

1172

errno = ret_errno;

1173

return false;

1174

}

1175

strcpy(ifr->ifr_name, ifname);

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

if(ret == -1){

1178

if(debug){

1179

ret_errno = errno;

1180

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

}

1183

return false;

1184

}

1185

return true;

1186

}

1187

1188

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

1189

1190

/* Reject the loopback device */

1191

if(ifr->ifr_flags & IFF_LOOPBACK){

1192

if(debug){

1193

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

1194

ifname);

1195

}

1196

return false;

1197

}

1198

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

1199

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

1200

if(debug){

1201

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

1202

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

1203

}

1204

return true;

1205

}

1206

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

1207

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

1208

if(debug){

1209

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1210

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

1211

}

1212

return false;

1213

}

1214

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

1215

if(ifr->ifr_flags & IFF_NOARP){

1216

if(debug){

1217

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

1218

ifname);

1219

}

1220

return false;

1221

}

1222

1223

/* Accept this device */

1224

if(debug){

1225

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

1226

}

1227

return true;

1228

}

1229

1230

/*

1231

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

1232

* corresponds to an acceptable network device.

1233

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

1234

*/

1235

int good_interface(const struct dirent *if_entry){

1236

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

1237

return 0;

1238

}

1239

1240

struct ifreq ifr;

1241

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

1242

if(debug){

1243

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

1244

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

1245

}

1246

return 0;

1247

}

1248

1249

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

1250

return 0;

1251

}

1252

return 1;

1253

}

1254

1255

/*

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

1285

}

1286

1287

int notdotentries(const struct dirent *direntry){

1288

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

1289

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

1290

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

1291

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

1292

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

1293

return 0;

1294

}

1295

return 1;

1296

}

1297

1298

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

1299

int runnable_hook(const struct dirent *direntry){

1300

int ret;

1301

size_t sret;

1302

struct stat st;

1303

1304

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

1305

/* Empty name? */

1306

return 0;

1307

}

1308

1309

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

1310

"abcdefghijklmnopqrstuvwxyz"

1311

"0123456789"

1312

"_-");

1313

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

1314

/* Contains non-allowed characters */

1315

if(debug){

1316

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

1317

direntry->d_name);

1318

}

1319

return 0;

1320

}

1321

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1330

if(ret == -1){

1331

if(debug){

1332

perror_plus("Could not stat hook");

1333

}

1334

return 0;

1335

}

1336

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

1337

/* Not a regular file */

1338

if(debug){

1339

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

1340

direntry->d_name);

1341

}

1342

return 0;

1343

}

1344

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

1345

/* Not executable */

1346

if(debug){

1347

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

1348

direntry->d_name);

1349

}

1350

return 0;

1351

}

1352

if(debug){

1353

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

1354

direntry->d_name);

1355

}

1356

return 1;

1357

}

1358

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1361

int ret;

1362

struct timespec now;

1363

struct timespec waited_time;

1364

intmax_t block_time;

1365

1366

while(true){

1367

if(mc->current_server == NULL){

1368

if (debug){

1369

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

1370

" No timeout!\n");

1371

}

1372

ret = avahi_simple_poll_iterate(s, -1);

1373

} else {

1374

if (debug){

1375

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

1376

" it, or wait\n");

1377

}

1378

/* the current time */

1379

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1380

if(ret == -1){

1381

perror_plus("clock_gettime");

1382

return -1;

1383

}

1384

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

1385

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

1386

waited_time.tv_sec = (now.tv_sec

1387

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

1388

waited_time.tv_nsec = (now.tv_nsec

1389

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

1390

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

1391

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

1392

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

1393

block_time = ((retry_interval

1394

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

1395

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

1396

1397

if (debug){

1398

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

1399

block_time);

1400

}

1401

1402

if(block_time <= 0){

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

1407

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1409

return 0;

1410

}

1411

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1413

if(ret == -1){

1414

perror_plus("clock_gettime");

1415

return -1;

1416

}

1417

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

1418

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

1419

servers, but don't block */

1420

}

1421

1422

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

1423

}

1424

if(ret != 0){

1425

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

1426

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

1427

}

1428

}

1429

}

1430

}

1431

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

const float delay){

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

1507

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1566

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1578

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1615

}

1616

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

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

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

971

1787

}

972

1788

973

1789

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

974

1794

AvahiSServiceBrowser *sb = NULL;

975

int error;

1795

error_t ret_errno;

976

1796

int ret;

977

1797

intmax_t tmpmax;

978

1798

char *tmp;

979

1799

int exitcode = EXIT_SUCCESS;

980

const char *interface = "eth0";

981

struct ifreq network;

982

int sd = -1;

983

bool take_down_interface = false;

984

uid_t uid;

985

gid_t gid;

986

char *connect_to = NULL;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

987

1802

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

988

1803

bool tempdir_created = false;

989

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

990

1805

const char *seckey = PATHDIR "/" SECKEY;

991

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

992

1809

993

1810

bool gnutls_initialized = false;

994

1811

bool gpgme_initialized = false;

995

1812

float delay = 2.5f;

1813

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

1814

retrying the same server again */

996

1815

997

struct sigaction old_sigterm_action;

1816

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

1817

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

999

1818

1819

uid = getuid();

1820

gid = getgid();

1821

1822

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

1823

errno = 0;

1824

ret = setgid(gid);

1825

if(ret == -1){

1826

perror_plus("setgid");

1827

}

1828

1829

/* Lower user privileges (temporarily) */

1830

errno = 0;

1831

ret = seteuid(uid);

1832

if(ret == -1){

1833

perror_plus("seteuid");

1834

}

1835

1836

if(quit_now){

1837

goto end;

1838

}

1839

1000

1840

{

1001

1841

struct argp_option options[] = {

1002

1842

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

1031

1871

.arg = "SECONDS",

1032

1872

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

1033

1873

.group = 2 },

1874

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

1875

.arg = "SECONDS",

1876

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

1877

.group = 2 },

1878

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

1879

.arg = "DIR",

1880

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

1881

.group = 2 },

1882

/*

1883

* These reproduce what we would get without ARGP_NO_HELP

1884

*/

1885

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

1886

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

1887

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

1888

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

1889

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

1890

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

1034

1891

{ .name = NULL }

1035

1892

};

1036

1893

1037

1894

error_t parse_opt(int key, char *arg,

1038

1895

struct argp_state *state){

1896

errno = 0;

1039

1897

switch(key){

1040

1898

case 128: /* --debug */

1041

1899

debug = true;

1044

1902

connect_to = arg;

1045

1903

break;

1046

1904

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

1047

interface = arg;

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1048

1910

break;

1049

1911

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

1050

1912

seckey = arg;

1057

1919

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

1058

1920

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

1059

1921

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

1060

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

1061

exit(EXIT_FAILURE);

1922

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

1062

1923

}

1063

1924

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

1064

1925

break;

1069

1930

errno = 0;

1070

1931

delay = strtof(arg, &tmp);

1071

1932

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

1072

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

1073

exit(EXIT_FAILURE);

1074

}

1075

break;

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

case ARGP_KEY_END:

1933

argp_error(state, "Bad delay");

1934

}

1935

case 132: /* --retry */

1936

errno = 0;

1937

retry_interval = strtod(arg, &tmp);

1938

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

1939

or (retry_interval * 1000) > INT_MAX

1940

or retry_interval < 0){

1941

argp_error(state, "Bad retry interval");

1942

}

1943

break;

1944

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

1945

hookdir = arg;

1946

break;

1947

/*

1948

* These reproduce what we would get without ARGP_NO_HELP

1949

*/

1950

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

1951

argp_state_help(state, state->out_stream,

1952

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1953

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1954

case -3: /* --usage */

1955

argp_state_help(state, state->out_stream,

1956

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1957

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

1958

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

1959

exit(argp_err_exit_status);

1079

1960

break;

1080

1961

default:

1081

1962

return ARGP_ERR_UNKNOWN;

1082

1963

}

1083

return 0;

1964

return errno;

1084

1965

}

1085

1966

1086

1967

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

1087

1968

.args_doc = "",

1088

1969

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

1089

1970

" passwords from a Mandos server" };

1090

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

1091

if(ret == ARGP_ERR_UNKNOWN){

1092

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

1093

exitcode = EXIT_FAILURE;

1971

ret = argp_parse(&argp, argc, argv,

1972

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1973

switch(ret){

1974

case 0:

1975

break;

1976

case ENOMEM:

1977

default:

1978

errno = ret;

1979

perror_plus("argp_parse");

1980

exitcode = EX_OSERR;

1981

goto end;

1982

case EINVAL:

1983

exitcode = EX_USAGE;

1984

goto end;

1985

}

1986

}

1987

1988

{

1989

/* Work around Debian bug #633582:

1990

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

1991

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

1994

struct stat st;

1995

1996

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

1997

int seckey_fd = open(seckey, O_RDONLY);

1998

if(seckey_fd == -1){

1999

perror_plus("open");

2000

} else {

2001

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

2002

if(ret == -1){

2003

perror_plus("fstat");

2004

} else {

2005

if(S_ISREG(st.st_mode)

2006

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

2007

ret = fchown(seckey_fd, uid, gid);

2008

if(ret == -1){

2009

perror_plus("fchown");

2010

}

2011

}

2012

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2014

}

2015

}

2016

2017

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

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2019

if(pubkey_fd == -1){

2020

perror_plus("open");

2021

} else {

2022

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

2023

if(ret == -1){

2024

perror_plus("fstat");

2025

} else {

2026

if(S_ISREG(st.st_mode)

2027

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

2028

ret = fchown(pubkey_fd, uid, gid);

2029

if(ret == -1){

2030

perror_plus("fchown");

2031

}

2032

}

2033

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2038

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

2056

}

2057

}

2058

}

2059

2060

/* Run network hooks */

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

1094

2075

goto end;

1095

2076

}

1096

2077

}

1103

2084

from the signal handler */

1104

2085

/* Initialize the pseudo-RNG for Avahi */

1105

2086

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

1106

mc.simple_poll = avahi_simple_poll_new();

1107

if(mc.simple_poll == NULL){

1108

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

1109

exitcode = EXIT_FAILURE;

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

2089

fprintf_plus(stderr,

2090

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

2091

exitcode = EX_UNAVAILABLE;

1110

2092

goto end;

1111

2093

}

1112

2094

1113

2095

sigemptyset(&sigterm_action.sa_mask);

1114

2096

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

1115

2097

if(ret == -1){

1116

perror("sigaddset");

1117

exitcode = EXIT_FAILURE;

2098

perror_plus("sigaddset");

2099

exitcode = EX_OSERR;

1118

2100

goto end;

1119

2101

}

1120

2102

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

1121

2103

if(ret == -1){

1122

perror("sigaddset");

1123

exitcode = EXIT_FAILURE;

2104

perror_plus("sigaddset");

2105

exitcode = EX_OSERR;

1124

2106

goto end;

1125

2107

}

1126

2108

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

1127

2109

if(ret == -1){

1128

perror("sigaddset");

1129

exitcode = EXIT_FAILURE;

2110

perror_plus("sigaddset");

2111

exitcode = EX_OSERR;

1130

2112

goto end;

1131

2113

}

1132

2114

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

1135

2117

*/

1136

2118

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

1137

2119

if(ret == -1){

1138

perror("sigaction");

1139

return EXIT_FAILURE;

2120

perror_plus("sigaction");

2121

return EX_OSERR;

1140

2122

}

1141

2123

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

2124

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

1143

2125

if(ret == -1){

1144

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

2126

perror_plus("sigaction");

2127

exitcode = EX_OSERR;

1146

2128

goto end;

1147

2129

}

1148

2130

}

1149

2131

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

1150

2132

if(ret == -1){

1151

perror("sigaction");

1152

return EXIT_FAILURE;

2133

perror_plus("sigaction");

2134

return EX_OSERR;

1153

2135

}

1154

2136

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

2137

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

1156

2138

if(ret == -1){

1157

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

2139

perror_plus("sigaction");

2140

exitcode = EX_OSERR;

1159

2141

goto end;

1160

2142

}

1161

2143

}

1162

2144

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

1163

2145

if(ret == -1){

1164

perror("sigaction");

1165

return EXIT_FAILURE;

2146

perror_plus("sigaction");

2147

return EX_OSERR;

1166

2148

}

1167

2149

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

2150

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

1169

2151

if(ret == -1){

1170

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1172

goto end;

1173

}

1174

}

1175

1176

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

1177

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

1178

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

if(if_index == 0){

1180

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

1181

exitcode = EXIT_FAILURE;

1182

goto end;

1183

}

1184

1185

if(quit_now){

1186

goto end;

1187

}

1188

1189

#ifdef __linux__

1190

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

messages to mess up the prompt */

1192

ret = klogctl(8, NULL, 5);

1193

bool restore_loglevel = true;

1194

if(ret == -1){

1195

restore_loglevel = false;

1196

perror("klogctl");

1197

}

1198

#endif /* __linux__ */

1199

1200

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1201

if(sd < 0){

1202

perror("socket");

1203

exitcode = EXIT_FAILURE;

1204

#ifdef __linux__

1205

if(restore_loglevel){

1206

ret = klogctl(7, NULL, 0);

1207

if(ret == -1){

1208

perror("klogctl");

1209

}

1210

}

1211

#endif /* __linux__ */

1212

goto end;

1213

}

1214

strcpy(network.ifr_name, interface);

1215

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

1216

if(ret == -1){

1217

perror("ioctl SIOCGIFFLAGS");

1218

#ifdef __linux__

1219

if(restore_loglevel){

1220

ret = klogctl(7, NULL, 0);

1221

if(ret == -1){

1222

perror("klogctl");

1223

}

1224

}

1225

#endif /* __linux__ */

1226

exitcode = EXIT_FAILURE;

1227

goto end;

1228

}

1229

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

1230

network.ifr_flags |= IFF_UP;

1231

take_down_interface = true;

1232

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

1233

if(ret == -1){

1234

take_down_interface = false;

1235

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1237

#ifdef __linux__

1238

if(restore_loglevel){

1239

ret = klogctl(7, NULL, 0);

1240

if(ret == -1){

1241

perror("klogctl");

2152

perror_plus("sigaction");

2153

exitcode = EX_OSERR;

2154

goto end;

2155

}

2156

}

2157

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

1242

2204

}

1243

2205

}

1244

#endif /* __linux__ */

1245

goto end;

1246

}

1247

}

1248

/* sleep checking until interface is running */

1249

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

1250

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

1251

if(ret == -1){

1252

perror("ioctl SIOCGIFFLAGS");

1253

} else if(network.ifr_flags & IFF_RUNNING){

1254

2206

break;

1255

2207

}

1256

struct timespec sleeptime = { .tv_nsec = 250000000 };

1257

ret = nanosleep(&sleeptime, NULL);

1258

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

1259

perror("nanosleep");

1260

}

1261

}

1262

if(not take_down_interface){

1263

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

1264

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

1265

if(ret == -1){

1266

perror("close");

1267

}

1268

}

1269

#ifdef __linux__

1270

if(restore_loglevel){

1271

/* Restores kernel loglevel to default */

1272

ret = klogctl(7, NULL, 0);

1273

if(ret == -1){

1274

perror("klogctl");

1275

}

1276

}

1277

#endif /* __linux__ */

1278

}

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1284

uid = getuid();

1285

gid = getgid();

1286

1287

errno = 0;

1288

setgid(gid);

1289

if(ret == -1){

1290

perror("setgid");

1291

}

1292

1293

ret = setuid(uid);

1294

if(ret == -1){

1295

perror("setuid");

1296

}

1297

1298

if(quit_now){

1299

goto end;

1300

}

1301

1302

ret = init_gnutls_global(pubkey, seckey);

1303

if(ret == -1){

1304

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

1305

exitcode = EXIT_FAILURE;

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

2233

}

2234

2235

if(quit_now){

2236

goto end;

2237

}

2238

2239

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

2240

if(ret == -1){

2241

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

2242

exitcode = EX_UNAVAILABLE;

1306

2243

goto end;

1307

2244

} else {

1308

2245

gnutls_initialized = true;

1312

2249

goto end;

1313

2250

}

1314

2251

2252

if(mkdtemp(tempdir) == NULL){

2253

perror_plus("mkdtemp");

2254

goto end;

2255

}

1315

2256

tempdir_created = true;

1316

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1318

perror("mkdtemp");

1319

goto end;

1320

}

1321

2257

1322

2258

if(quit_now){

1323

2259

goto end;

1324

2260

}

1325

2261

1326

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

1327

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

1328

exitcode = EXIT_FAILURE;

2262

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

2263

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

2264

exitcode = EX_UNAVAILABLE;

1329

2265

goto end;

1330

2266

} else {

1331

2267

gpgme_initialized = true;

1339

2275

/* Connect directly, do not use Zeroconf */

1340

2276

/* (Mainly meant for debugging) */

1341

2277

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

2278

1342

2279

if(address == NULL){

1343

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

1344

exitcode = EXIT_FAILURE;

2280

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

2281

exitcode = EX_USAGE;

1345

2282

goto end;

1346

2283

}

1347

2284

1349

2286

goto end;

1350

2287

}

1351

2288

1352

uint16_t port;

2289

in_port_t port;

1353

2290

errno = 0;

1354

2291

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

1355

2292

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

1356

or tmpmax != (uint16_t)tmpmax){

1357

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

1358

exitcode = EXIT_FAILURE;

2293

or tmpmax != (in_port_t)tmpmax){

2294

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

2295

exitcode = EX_USAGE;

1359

2296

goto end;

1360

2297

}

1361

2298

1362

2299

if(quit_now){

1363

2300

goto end;

1364

2301

}

1365

2302

1366

port = (uint16_t)tmpmax;

2303

port = (in_port_t)tmpmax;

1367

2304

*address = '\0';

1368

address = connect_to;

1369

2305

/* Colon in address indicates IPv6 */

1370

2306

int af;

1371

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

2307

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

1372

2308

af = AF_INET6;

2309

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

2310

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

2311

{

2312

connect_to++;

2313

address[-1] = '\0';

2314

}

1373

2315

} else {

1374

2316

af = AF_INET;

1375

2317

}

2318

address = connect_to;

1376

2319

1377

2320

if(quit_now){

1378

2321

goto end;

1379

2322

}

1380

2323

1381

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

1382

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1384

} else {

2324

while(not quit_now){

2325

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

2326

&mc);

2327

if(quit_now or ret == 0){

2328

break;

2329

}

2330

if(debug){

2331

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

2332

(int)retry_interval);

2333

}

2334

sleep((int)retry_interval);

2335

}

2336

2337

if (not quit_now){

1385

2338

exitcode = EXIT_SUCCESS;

1386

2339

}

2340

1387

2341

goto end;

1388

2342

}

1389

2343

1401

2355

config.publish_domain = 0;

1402

2356

1403

2357

/* Allocate a new server */

1404

mc.server = avahi_server_new(avahi_simple_poll_get

1405

(mc.simple_poll), &config, NULL,

1406

NULL, &error);

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

1407

2360

1408

2361

/* Free the Avahi configuration data */

1409

2362

avahi_server_config_free(&config);

1411

2364

1412

2365

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

1413

2366

if(mc.server == NULL){

1414

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

1415

avahi_strerror(error));

1416

exitcode = EXIT_FAILURE;

2367

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

2368

avahi_strerror(ret_errno));

2369

exitcode = EX_UNAVAILABLE;

1417

2370

goto end;

1418

2371

}

1419

2372

1424

2377

/* Create the Avahi service browser */

1425

2378

sb = avahi_s_service_browser_new(mc.server, if_index,

1426

2379

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1427

NULL, 0, browse_callback, NULL);

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

1428

2382

if(sb == NULL){

1429

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

1430

avahi_strerror(avahi_server_errno(mc.server)));

1431

exitcode = EXIT_FAILURE;

2383

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

2384

avahi_strerror(avahi_server_errno(mc.server)));

2385

exitcode = EX_UNAVAILABLE;

1432

2386

goto end;

1433

2387

}

1434

2388

1439

2393

/* Run the main loop */

1440

2394

1441

2395

if(debug){

1442

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

1443

}

1444

1445

avahi_simple_poll_loop(mc.simple_poll);

2396

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

2397

}

2398

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2401

if(debug){

2402

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

2403

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

2404

}

1446

2405

1447

2406

end:

1448

2407

1449

2408

if(debug){

1450

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

2409

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

1451

2410

}

1452

2411

1453

2412

/* Cleanup things */

2413

free(mc.interfaces);

2414

1454

2415

if(sb != NULL)

1455

2416

avahi_s_service_browser_free(sb);

1456

2417

1457

2418

if(mc.server != NULL)

1458

2419

avahi_server_free(mc.server);

1459

2420

1460

if(mc.simple_poll != NULL)

1461

avahi_simple_poll_free(mc.simple_poll);

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

1462

2423

1463

2424

if(gnutls_initialized){

1464

2425

gnutls_certificate_free_credentials(mc.cred);

1470

2431

gpgme_release(mc.ctx);

1471

2432

}

1472

2433

1473

/* Take down the network interface */

1474

if(take_down_interface){

1475

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

1476

if(ret == -1){

1477

perror("ioctl SIOCGIFFLAGS");

1478

} else if(network.ifr_flags & IFF_UP) {

1479

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

1480

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

1481

if(ret == -1){

1482

perror("ioctl SIOCSIFFLAGS");

1483

}

1484

}

1485

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

1486

if(ret == -1){

1487

perror("close");

1488

}

1489

}

1490

1491

/* Removes the temp directory used by GPGME */

2434

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

2435

has seen */

2436

if(mc.current_server != NULL){

2437

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

2438

while(mc.current_server != NULL){

2439

server *next = mc.current_server->next;

2440

free(mc.current_server);

2441

mc.current_server = next;

2442

}

2443

}

2444

2445

/* Re-raise priviliges */

2446

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

2472

}

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2476

2477

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

1492

2478

if(tempdir_created){

1493

DIR *d;

1494

struct dirent *direntry;

1495

d = opendir(tempdir);

1496

if(d == NULL){

1497

if(errno != ENOENT){

1498

perror("opendir");

1499

}

1500

} else {

1501

while(true){

1502

direntry = readdir(d);

1503

if(direntry == NULL){

1504

break;

1505

}

1506

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

1507

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

1508

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

1509

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

1510

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

1511

continue;

1512

}

2479

struct dirent **direntries = NULL;

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

2484

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

2485

direntry = direntries[i];

1513

2486

char *fullname = NULL;

1514

2487

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

1515

2488

direntry->d_name);

1516

2489

if(ret < 0){

1517

perror("asprintf");

2490

perror_plus("asprintf");

1518

2491

continue;

1519

2492

}

1520

2493

ret = remove(fullname);

1521

2494

if(ret == -1){

1522

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

1523

strerror(errno));

2495

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

2496

strerror(errno));

1524

2497

}

1525

2498

free(fullname);

1526

2499

}

1527

closedir(d);

2500

}

2501

2502

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

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

1528

2506

}

1529

2507

ret = rmdir(tempdir);

1530

2508

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

1531

perror("rmdir");

2509

perror_plus("rmdir");

1532

2510

}

1533

2511

}

1534

2512

1535

2513

if(quit_now){

1536

2514

sigemptyset(&old_sigterm_action.sa_mask);

1537

2515

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

2516

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2517

&old_sigterm_action,

2518

NULL));

1539

2519

if(ret == -1){

1540

perror("sigaction");

1541

}

1542

raise(signal_received);

2520

perror_plus("sigaction");

2521

}

2522

do {

2523

ret = raise(signal_received);

2524

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

2525

if(ret != 0){

2526

perror_plus("raise");

2527

abort();

2528

}

2529

TEMP_FAILURE_RETRY(pause());

1543

2530

}

1544

2531

1545

2532

return exitcode;