/mandos/release : revision 237.7.218

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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, srand(),

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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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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inet_pton(), connect(),

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getnameinfo() */

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

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

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*/

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

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strtoimax() */

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

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

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#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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*/

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

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

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setgid(), pause() */

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

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

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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118

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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132

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

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133

#define SECKEY "seckey.txt"

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134

#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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138

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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162

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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173

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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 */

178

void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

194

}

195

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/*

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

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198

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

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* "buffer_length" is how much is already used.

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200

*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

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

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if(buffer == NULL){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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211

}

212

*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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214

}

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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){

224

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

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if(ret == -1){

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perror_plus("clock_gettime");

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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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return true;

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}

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/*

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* Initialize GPGME.

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*/

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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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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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265

*/

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

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272

if(fd == -1){

188

perror("open");

273

perror_plus("open");

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return false;

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}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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fprintf(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){

208

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));

307

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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310

}

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311

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

312

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

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313

rc = gpgme_get_engine_info(&engine_info);

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314

if(rc != GPG_ERR_NO_ERROR){

230

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

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gpgme_strsource(rc), gpgme_strerror(rc));

315

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

316

gpgme_strsource(rc), gpgme_strerror(rc));

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317

return false;

233

318

}

234

319

while(engine_info != NULL){

240

325

engine_info = engine_info->next;

241

326

}

242

327

if(engine_info == NULL){

243

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

328

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

329

tempdir);

244

330

return false;

245

331

}

246

332

247

333

/* Create new GPGME "context" */

248

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

334

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

249

335

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

336

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

337

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

338

gpgme_strerror(rc));

252

339

return false;

253

340

}

254

341

265

352

*/

266

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

267

354

size_t crypto_size,

268

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

269

357

gpgme_data_t dh_crypto, dh_plain;

270

358

gpgme_error_t rc;

271

359

ssize_t ret;

273

361

ssize_t plaintext_length = 0;

274

362

275

363

if(debug){

276

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

364

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

277

365

}

278

366

279

367

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

280

368

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

369

0);

282

370

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

285

373

return -1;

286

374

}

287

375

288

376

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

289

377

rc = gpgme_data_new(&dh_plain);

290

378

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

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

381

gpgme_strsource(rc), gpgme_strerror(rc));

293

382

gpgme_data_release(dh_crypto);

294

383

return -1;

295

384

}

296

385

297

386

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

298

387

data buffer */

299

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

388

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

300

389

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

390

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

391

gpgme_strsource(rc), gpgme_strerror(rc));

303

392

plaintext_length = -1;

304

393

if(debug){

305

394

gpgme_decrypt_result_t result;

306

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

307

396

if(result == NULL){

308

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

397

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

309

398

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

399

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

400

result->unsupported_algorithm);

401

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

402

result->wrong_key_usage);

314

403

if(result->file_name != NULL){

315

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

404

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

316

405

}

317

406

gpgme_recipient_t recipient;

318

407

recipient = result->recipients;

319

408

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

409

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

410

gpgme_pubkey_algo_name

411

(recipient->pubkey_algo));

412

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

413

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

414

recipient->status == GPG_ERR_NO_SECKEY

415

? "No" : "Yes");

326

416

recipient = recipient->next;

327

417

}

328

418

}

331

421

}

332

422

333

423

if(debug){

334

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

424

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

335

425

}

336

426

337

427

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

338

428

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

339

perror("gpgme_data_seek");

429

perror_plus("gpgme_data_seek");

340

430

plaintext_length = -1;

341

431

goto decrypt_end;

342

432

}

344

434

*plaintext = NULL;

345

435

while(true){

346

436

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

437

(size_t)plaintext_length,

438

plaintext_capacity);

349

439

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

440

perror_plus("incbuffer");

441

plaintext_length = -1;

442

goto decrypt_end;

353

443

}

354

444

355

445

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

450

break;

361

451

}

362

452

if(ret < 0){

363

perror("gpgme_data_read");

453

perror_plus("gpgme_data_read");

364

454

plaintext_length = -1;

365

455

goto decrypt_end;

366

456

}

368

458

}

369

459

370

460

if(debug){

371

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

461

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

372

462

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

373

463

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

374

464

}

386

476

}

387

477

388

478

static const char * safer_gnutls_strerror(int value){

389

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

390

-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

391

480

if(ret == NULL)

392

481

ret = "(unknown)";

393

482

return ret;

396

485

/* GnuTLS log function callback */

397

486

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

398

487

const char* string){

399

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

488

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

400

489

}

401

490

402

491

static int init_gnutls_global(const char *pubkeyfilename,

403

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

404

494

int ret;

405

495

406

496

if(debug){

407

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

497

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

408

498

}

409

499

410

500

ret = gnutls_global_init();

411

501

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

502

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

503

safer_gnutls_strerror(ret));

414

504

return -1;

415

505

}

416

506

423

513

}

424

514

425

515

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

427

517

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

518

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

519

safer_gnutls_strerror(ret));

433

520

gnutls_global_deinit();

434

521

return -1;

435

522

}

436

523

437

524

if(debug){

438

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

439

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

440

seckeyfilename);

525

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

526

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

527

pubkeyfilename,

528

seckeyfilename);

441

529

}

442

530

443

531

ret = gnutls_certificate_set_openpgp_key_file

444

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

445

533

GNUTLS_OPENPGP_FMT_BASE64);

446

534

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

535

fprintf_plus(stderr,

536

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

537

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

538

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

539

safer_gnutls_strerror(ret));

452

540

goto globalfail;

453

541

}

454

542

455

543

/* GnuTLS server initialization */

456

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

457

545

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

" initialization: %s\n",

548

safer_gnutls_strerror(ret));

460

549

goto globalfail;

461

550

}

462

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

551

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

463

552

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

553

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

554

safer_gnutls_strerror(ret));

466

555

goto globalfail;

467

556

}

468

557

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

470

559

471

560

return 0;

472

561

473

562

globalfail:

474

563

475

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

476

565

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

478

567

return -1;

479

568

}

480

569

481

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

482

572

int ret;

483

573

/* GnuTLS session creation */

484

574

do {

488

578

}

489

579

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

490

580

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

581

fprintf_plus(stderr,

582

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

583

safer_gnutls_strerror(ret));

493

584

}

494

585

495

586

{

496

587

const char *err;

497

588

do {

498

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

589

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

499

590

if(quit_now){

500

591

gnutls_deinit(*session);

501

592

return -1;

502

593

}

503

594

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

504

595

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

596

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

597

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

598

safer_gnutls_strerror(ret));

508

599

gnutls_deinit(*session);

509

600

return -1;

510

601

}

512

603

513

604

do {

514

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

606

mc->cred);

516

607

if(quit_now){

517

608

gnutls_deinit(*session);

518

609

return -1;

519

610

}

520

611

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

521

612

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

613

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

614

safer_gnutls_strerror(ret));

524

615

gnutls_deinit(*session);

525

616

return -1;

526

617

}

528

619

/* ignore client certificate if any. */

529

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

530

621

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

532

623

533

624

return 0;

534

625

}

538

629

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

539

630

540

631

/* Called when a Mandos server is found */

541

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

632

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

542

633

AvahiIfIndex if_index,

543

int af){

634

int af, mandos_context *mc){

544

635

int ret, tcp_sd = -1;

545

636

ssize_t sret;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

637

struct sockaddr_storage to;

550

638

char *buffer = NULL;

551

639

char *decrypted_buffer = NULL;

552

640

size_t buffer_length = 0;

571

659

pf = PF_INET;

572

660

break;

573

661

default:

574

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

662

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

575

663

errno = EINVAL;

576

664

return -1;

577

665

}

578

666

579

ret = init_gnutls_session(&session);

667

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

668

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

669

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

670

bool match = false;

671

{

672

char *interface = NULL;

673

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

674

interface))){

675

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

676

match = true;

677

break;

678

}

679

}

680

}

681

if(not match){

682

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

683

connect to the server */

684

if(debug){

685

char interface[IF_NAMESIZE];

686

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

687

perror_plus("if_indextoname");

688

} else {

689

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

690

" \"%s\"\n",

691

if_indextoname((unsigned int)if_index,

692

interface));

693

}

694

}

695

return -1;

696

}

697

}

698

699

ret = init_gnutls_session(&session, mc);

580

700

if(ret != 0){

581

701

return -1;

582

702

}

583

703

584

704

if(debug){

585

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

586

"\n", ip, port);

705

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

706

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

587

707

}

588

708

589

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

710

if(tcp_sd < 0){

591

711

int e = errno;

592

perror("socket");

712

perror_plus("socket");

593

713

errno = e;

594

714

goto mandos_end;

595

715

}

601

721

602

722

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

603

723

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

605

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

724

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

725

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

606

726

} else { /* IPv4 */

607

to.in.sin_family = (sa_family_t)af;

608

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

727

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

728

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

609

729

}

610

730

if(ret < 0 ){

611

731

int e = errno;

612

perror("inet_pton");

732

perror_plus("inet_pton");

613

733

errno = e;

614

734

goto mandos_end;

615

735

}

616

736

if(ret == 0){

617

737

int e = errno;

618

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

738

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

619

739

errno = e;

620

740

goto mandos_end;

621

741

}

622

742

if(af == AF_INET6){

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

743

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

744

if(IN6_IS_ADDR_LINKLOCAL

745

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

630

746

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

747

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

748

" incomplete without a network interface\n");

633

749

errno = EINVAL;

634

750

goto mandos_end;

635

751

}

636

752

/* Set the network interface number as scope */

637

to.in6.sin6_scope_id = (uint32_t)if_index;

753

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

638

754

}

639

755

} else {

640

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

641

-Wconversion and

642

-Wunreachable-code */

756

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

643

757

}

644

758

645

759

if(quit_now){

651

765

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

652

766

char interface[IF_NAMESIZE];

653

767

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

654

perror("if_indextoname");

768

perror_plus("if_indextoname");

655

769

} else {

656

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

657

ip, interface, port);

770

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

771

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

658

772

}

659

773

} else {

660

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

661

port);

774

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

775

ip, (uintmax_t)port);

662

776

}

663

777

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

778

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

665

const char *pcret;

666

779

if(af == AF_INET6){

667

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

668

sizeof(addrstr));

780

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

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

669

784

} else {

670

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

671

sizeof(addrstr));

785

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

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

672

789

}

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

790

if(ret == EAI_SYSTEM){

791

perror_plus("getnameinfo");

792

} else if(ret != 0) {

793

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

794

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

795

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

679

796

}

680

797

}

681

798

685

802

}

686

803

687

804

if(af == AF_INET6){

688

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

805

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

806

sizeof(struct sockaddr_in6));

689

807

} else {

690

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

808

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

809

sizeof(struct sockaddr_in));

691

810

}

692

811

if(ret < 0){

693

812

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

694

813

int e = errno;

695

perror("connect");

814

perror_plus("connect");

696

815

errno = e;

697

816

}

698

817

goto mandos_end;

708

827

while(true){

709

828

size_t out_size = strlen(out);

710

829

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

711

out_size - written));

830

out_size - written));

712

831

if(ret == -1){

713

832

int e = errno;

714

perror("write");

833

perror_plus("write");

715

834

errno = e;

716

835

goto mandos_end;

717

836

}

734

853

}

735

854

736

855

if(debug){

737

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

856

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

738

857

}

739

858

740

859

if(quit_now){

742

861

goto mandos_end;

743

862

}

744

863

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

864

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

865

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

866

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

867

gnutls_transport_set_ptr(session,

868

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

746

869

747

870

if(quit_now){

748

871

errno = EINTR;

759

882

760

883

if(ret != GNUTLS_E_SUCCESS){

761

884

if(debug){

762

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

885

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

763

886

gnutls_perror(ret);

764

887

}

765

888

errno = EPROTO;

769

892

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

770

893

771

894

if(debug){

772

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

773

ip);

895

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

896

" %s\n", ip);

774

897

}

775

898

776

899

while(true){

781

904

}

782

905

783

906

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

907

buffer_capacity);

785

908

if(buffer_capacity == 0){

786

909

int e = errno;

787

perror("incbuffer");

910

perror_plus("incbuffer");

788

911

errno = e;

789

912

goto mandos_end;

790

913

}

814

937

}

815

938

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

816

939

if(ret < 0){

817

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

940

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

941

"***\n");

818

942

gnutls_perror(ret);

819

943

errno = EPROTO;

820

944

goto mandos_end;

821

945

}

822

946

break;

823

947

default:

824

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

825

" encrypted session with Mandos server\n");

948

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

949

" encrypted session with Mandos server\n");

826

950

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

951

errno = EIO;

828

952

goto mandos_end;

833

957

}

834

958

835

959

if(debug){

836

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

960

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

837

961

}

838

962

839

963

if(quit_now){

851

975

852

976

if(buffer_length > 0){

853

977

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

856

&decrypted_buffer);

978

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

979

&decrypted_buffer, mc);

857

980

if(decrypted_buffer_size >= 0){

858

981

859

982

written = 0;

869

992

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

870

993

int e = errno;

871

994

if(debug){

872

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

873

strerror(errno));

995

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

996

strerror(errno));

874

997

}

875

998

errno = e;

876

999

goto mandos_end;

895

1018

if(e == 0){

896

1019

e = errno;

897

1020

}

898

perror("close");

1021

perror_plus("close");

899

1022

}

900

1023

gnutls_deinit(session);

1024

errno = e;

901

1025

if(quit_now){

902

e = EINTR;

1026

errno = EINTR;

903

1027

retval = -1;

904

1028

}

905

errno = e;

906

1029

}

907

1030

return retval;

908

1031

}

920

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

921

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

922

1045

flags,

923

AVAHI_GCC_UNUSED void* userdata){

924

assert(r);

1046

void* mc){

1047

if(r == NULL){

1048

return;

1049

}

925

1050

926

1051

/* Called whenever a service has been resolved successfully or

927

1052

timed out */

933

1058

switch(event){

934

1059

default:

935

1060

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1061

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

1062

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

1063

domain,

1064

avahi_strerror(avahi_server_errno

1065

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

939

1066

break;

940

1067

941

1068

case AVAHI_RESOLVER_FOUND:

943

1070

char ip[AVAHI_ADDRESS_STR_MAX];

944

1071

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

945

1072

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1073

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

1074

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

1075

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

949

1076

}

950

int ret = start_mandos_communication(ip, port, interface,

951

avahi_proto_to_af(proto));

1077

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

1078

interface,

1079

avahi_proto_to_af(proto),

1080

mc);

952

1081

if(ret == 0){

953

avahi_simple_poll_quit(mc.simple_poll);

1082

avahi_simple_poll_quit(simple_poll);

1083

} else {

1084

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

1085

avahi_proto_to_af(proto),

1086

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

1087

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

1088

" list\n", name);

1089

}

954

1090

}

955

1091

}

956

1092

}

966

1102

const char *domain,

967

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

968

1104

flags,

969

AVAHI_GCC_UNUSED void* userdata){

970

assert(b);

1105

void* mc){

1106

if(b == NULL){

1107

return;

1108

}

971

1109

972

1110

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

973

1111

is removed from the LAN */

980

1118

default:

981

1119

case AVAHI_BROWSER_FAILURE:

982

1120

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

1121

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

1122

avahi_strerror(avahi_server_errno

1123

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

1124

avahi_simple_poll_quit(simple_poll);

986

1125

return;

987

1126

988

1127

case AVAHI_BROWSER_NEW:

991

1130

the callback function is called the Avahi server will free the

992

1131

resolver for us. */

993

1132

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

997

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

998

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

1133

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

1134

interface, protocol, name, type,

1135

domain, protocol, 0,

1136

resolve_callback, mc) == NULL)

1137

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

1138

" %s\n", name,

1139

avahi_strerror(avahi_server_errno

1140

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

999

1141

break;

1000

1142

1001

1143

case AVAHI_BROWSER_REMOVE:

1004

1146

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1147

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1148

if(debug){

1007

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

1149

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

1150

" searching...\n");

1008

1151

}

1009

1152

break;

1010

1153

}

1011

1154

}

1012

1155

1013

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

1156

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

1014

1157

static void handle_sigterm(int sig){

1015

1158

if(quit_now){

1016

1159

return;

1018

1161

quit_now = 1;

1019

1162

signal_received = sig;

1020

1163

int old_errno = errno;

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1164

/* set main loop to exit */

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1023

1167

}

1024

1168

errno = old_errno;

1025

1169

}

1026

1170

1171

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

1172

int ret;

1173

error_t ret_errno;

1174

1175

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

1176

if(s < 0){

1177

ret_errno = errno;

1178

perror_plus("socket");

1179

errno = ret_errno;

1180

return false;

1181

}

1182

strcpy(ifr->ifr_name, ifname);

1183

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1184

if(ret == -1){

1185

if(debug){

1186

ret_errno = errno;

1187

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1189

}

1190

return false;

1191

}

1192

return true;

1193

}

1194

1195

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

1196

1197

/* Reject the loopback device */

1198

if(ifr->ifr_flags & IFF_LOOPBACK){

1199

if(debug){

1200

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

1201

ifname);

1202

}

1203

return false;

1204

}

1205

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

1206

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

1207

if(debug){

1208

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

1209

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

1210

}

1211

return true;

1212

}

1213

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

1214

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

1215

if(debug){

1216

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1217

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

1218

}

1219

return false;

1220

}

1221

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

1222

if(ifr->ifr_flags & IFF_NOARP){

1223

if(debug){

1224

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

1225

ifname);

1226

}

1227

return false;

1228

}

1229

1230

/* Accept this device */

1231

if(debug){

1232

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

1233

}

1234

return true;

1235

}

1236

1027

1237

/*

1028

1238

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

1029

1239

* corresponds to an acceptable network device.

1030

1240

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

1031

1241

*/

1032

1242

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

1243

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

1042

1244

return 0;

1043

1245

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1246

1247

struct ifreq ifr;

1248

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

1249

if(debug){

1250

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

1251

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

1252

}

1253

return 0;

1254

}

1255

1256

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

1257

return 0;

1258

}

1259

return 1;

1260

}

1261

1262

/*

1263

* This function determines if a network interface is up.

1264

*/

1265

bool interface_is_up(const char *interface){

1266

struct ifreq ifr;

1267

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

1268

if(debug){

1269

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

1270

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

1271

}

1272

return false;

1273

}

1274

1275

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

1276

}

1277

1278

/*

1279

* This function determines if a network interface is running

1280

*/

1281

bool interface_is_running(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

int notdotentries(const struct dirent *direntry){

1295

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

1296

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

1297

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

1298

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

1299

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

1300

return 0;

1301

}

1302

return 1;

1303

}

1304

1305

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

1306

int runnable_hook(const struct dirent *direntry){

1307

int ret;

1308

size_t sret;

1309

struct stat st;

1310

1311

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

1312

/* Empty name? */

1313

return 0;

1314

}

1315

1316

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

1317

"abcdefghijklmnopqrstuvwxyz"

1318

"0123456789"

1319

"_-");

1320

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

1321

/* Contains non-allowed characters */

1322

if(debug){

1323

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

1324

direntry->d_name);

1325

}

1326

return 0;

1327

}

1328

1329

char *fullname = NULL;

1330

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

1331

if(ret < 0){

1332

perror_plus("asprintf");

1333

return 0;

1334

}

1335

1336

ret = stat(fullname, &st);

1337

if(ret == -1){

1338

if(debug){

1339

perror_plus("Could not stat hook");

1340

}

1341

return 0;

1342

}

1343

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

1344

/* Not a regular file */

1345

if(debug){

1346

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

1347

direntry->d_name);

1348

}

1349

return 0;

1350

}

1351

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

1352

/* Not executable */

1353

if(debug){

1354

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

1355

direntry->d_name);

1356

}

1357

return 0;

1358

}

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

return 1;

1364

}

1365

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

mandos_context *mc){

1368

int ret;

1369

struct timespec now;

1370

struct timespec waited_time;

1371

intmax_t block_time;

1372

1373

while(true){

1374

if(mc->current_server == NULL){

1375

if (debug){

1376

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

1377

" No timeout!\n");

1378

}

1379

ret = avahi_simple_poll_iterate(s, -1);

1380

} else {

1381

if (debug){

1382

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

1383

" it, or wait\n");

1384

}

1385

/* the current time */

1386

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1387

if(ret == -1){

1388

perror_plus("clock_gettime");

1389

return -1;

1390

}

1391

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

1392

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

1393

waited_time.tv_sec = (now.tv_sec

1394

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

1395

waited_time.tv_nsec = (now.tv_nsec

1396

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

1397

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

1398

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

1399

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

1400

block_time = ((retry_interval

1401

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

1402

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

1403

1404

if (debug){

1405

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

1406

block_time);

1407

}

1408

1409

if(block_time <= 0){

1410

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

1411

mc->current_server->port,

1412

mc->current_server->if_index,

1413

mc->current_server->af, mc);

1414

if(ret == 0){

1415

avahi_simple_poll_quit(s);

1416

return 0;

1417

}

1418

ret = clock_gettime(CLOCK_MONOTONIC,

1419

&mc->current_server->last_seen);

1420

if(ret == -1){

1421

perror_plus("clock_gettime");

1422

return -1;

1423

}

1424

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

1425

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

1426

servers, but don't block */

1427

}

1428

1429

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

1430

}

1431

if(ret != 0){

1432

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

1433

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

1434

}

1435

}

1436

}

1437

}

1438

1439

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

1440

error_t raise_privileges(void){

1441

error_t old_errno = errno;

1442

error_t ret_errno = 0;

1443

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

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1446

}

1447

errno = old_errno;

1448

return ret_errno;

1449

}

1450

1451

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

1452

error_t raise_privileges_permanently(void){

1453

error_t old_errno = errno;

1454

error_t ret_errno = raise_privileges();

1455

if(ret_errno != 0){

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

error_t lower_privileges(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = 0;

1471

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

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1474

}

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

1479

/* Lower privileges permanently */

1480

error_t lower_privileges_permanently(void){

1481

error_t old_errno = errno;

1482

error_t ret_errno = 0;

1483

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

1484

ret_errno = errno;

1485

perror_plus("setuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

1492

const float delay){

1493

struct dirent **direntries;

1494

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

1495

alphasort);

1496

if(numhooks == -1){

1497

if(errno == ENOENT){

1498

if(debug){

1499

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

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

1504

}

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1508

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

1509

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

1510

direntry = direntries[i];

1511

char *fullname = NULL;

1512

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

1513

if(ret < 0){

1514

perror_plus("asprintf");

1515

continue;

1516

}

1517

if(debug){

1518

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

1519

direntry->d_name);

1520

}

1521

pid_t hook_pid = fork();

1522

if(hook_pid == 0){

1523

/* Child */

1524

/* Raise privileges */

1525

raise_privileges_permanently();

1526

/* Set group */

1527

errno = 0;

1528

ret = setgid(0);

1529

if(ret == -1){

1530

perror_plus("setgid");

1531

}

1532

/* Reset supplementary groups */

1533

errno = 0;

1534

ret = setgroups(0, NULL);

1535

if(ret == -1){

1536

perror_plus("setgroups");

1537

}

1538

dup2(devnull, STDIN_FILENO);

1539

close(devnull);

1540

dup2(STDERR_FILENO, STDOUT_FILENO);

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

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

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

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

1552

if(ret == -1){

1553

perror_plus("setenv");

1554

_exit(EX_OSERR);

1555

}

1556

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

1557

if(ret == -1){

1558

perror_plus("setenv");

1559

_exit(EX_OSERR);

1560

}

1561

char *delaystring;

1562

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

1563

if(ret == -1){

1564

perror_plus("asprintf");

1565

_exit(EX_OSERR);

1566

}

1567

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

1568

if(ret == -1){

1569

free(delaystring);

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

free(delaystring);

1574

if(connect_to != NULL){

1575

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

1576

if(ret == -1){

1577

perror_plus("setenv");

1578

_exit(EX_OSERR);

1579

}

1580

}

1581

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

1582

perror_plus("execl");

1583

_exit(EXIT_FAILURE);

1584

}

1585

} else {

1586

int status;

1587

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

1588

perror_plus("waitpid");

1589

free(fullname);

1590

continue;

1591

}

1592

if(WIFEXITED(status)){

1593

if(WEXITSTATUS(status) != 0){

1594

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

1595

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

1596

WEXITSTATUS(status));

1597

free(fullname);

1598

continue;

1599

}

1600

} else if(WIFSIGNALED(status)){

1601

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

1602

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

1603

WTERMSIG(status));

1604

free(fullname);

1605

continue;

1606

} else {

1607

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

1608

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

1609

free(fullname);

1610

continue;

1611

}

1612

}

1613

free(fullname);

1614

if(debug){

1615

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

1616

direntry->d_name);

1617

}

1618

}

1619

close(devnull);

1620

}

1621

return true;

1622

}

1623

1624

error_t bring_up_interface(const char *const interface,

1625

const float delay){

1626

int sd = -1;

1627

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1630

struct ifreq network;

1631

unsigned int if_index = if_nametoindex(interface);

1632

if(if_index == 0){

1633

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

1634

errno = old_errno;

1635

return ENXIO;

1636

}

1637

1638

if(quit_now){

1639

errno = old_errno;

1640

return EINTR;

1641

}

1642

1643

if(not interface_is_up(interface)){

1644

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

1645

ret_errno = errno;

1646

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

1647

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

1648

return ret_errno;

1649

}

1650

network.ifr_flags |= IFF_UP;

1651

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1654

ret_errno = errno;

1655

perror_plus("socket");

1656

errno = old_errno;

1657

return ret_errno;

1658

}

1659

1660

if(quit_now){

1661

close(sd);

1662

errno = old_errno;

1663

return EINTR;

1664

}

1665

1666

if(debug){

1667

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

1668

interface);

1669

}

1670

1671

/* Raise priviliges */

1672

raise_privileges();

1673

1674

#ifdef __linux__

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

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

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

1682

}

1683

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1686

#ifdef __linux__

1687

if(restore_loglevel){

1688

ret_linux = klogctl(7, NULL, 0);

1689

if(ret_linux == -1){

1690

perror_plus("klogctl");

1691

}

1692

}

1693

#endif /* __linux__ */

1694

1695

/* Lower privileges */

1696

lower_privileges();

1697

1698

/* Close the socket */

1699

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

1700

if(ret == -1){

1701

perror_plus("close");

1702

}

1703

1704

if(ret_setflags == -1){

1705

errno = ret_errno;

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

errno = old_errno;

1708

return ret_errno;

1709

}

1710

} else if(debug){

1711

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

1712

interface);

1713

}

1714

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

if(interface_is_running(interface)){

1070

1719

break;

1071

1720

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1721

struct timespec sleeptime = { .tv_nsec = 250000000 };

1722

ret = nanosleep(&sleeptime, NULL);

1723

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

1724

perror_plus("nanosleep");

1725

}

1726

}

1727

1728

errno = old_errno;

1729

return 0;

1730

}

1731

1732

error_t take_down_interface(const char *const interface){

1733

error_t old_errno = errno;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1743

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

1744

ret_errno = errno;

1745

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

1746

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

1747

return ret_errno;

1748

}

1749

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

1750

1751

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

1752

if(sd < 0){

1753

ret_errno = errno;

1754

perror_plus("socket");

1755

errno = old_errno;

1756

return ret_errno;

1757

}

1758

1759

if(debug){

1760

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

1761

interface);

1762

}

1763

1764

/* Raise priviliges */

1765

raise_privileges();

1766

1767

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

1768

ret_errno = errno;

1769

1770

/* Lower privileges */

1771

lower_privileges();

1772

1773

/* Close the socket */

1774

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

1775

if(ret == -1){

1776

perror_plus("close");

1777

}

1778

1779

if(ret_setflags == -1){

1780

errno = ret_errno;

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

errno = old_errno;

1783

return ret_errno;

1784

}

1785

} else if(debug){

1786

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

1787

interface);

1788

}

1789

1790

errno = old_errno;

1791

return 0;

1120

1792

}

1121

1793

1122

1794

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

1795

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

1796

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

1797

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

1798

.interfaces = NULL, .interfaces_size = 0 };

1123

1799

AvahiSServiceBrowser *sb = NULL;

1124

int error;

1800

error_t ret_errno;

1125

1801

int ret;

1126

1802

intmax_t tmpmax;

1127

1803

char *tmp;

1128

1804

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

1130

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

1133

uid_t uid;

1134

gid_t gid;

1805

char *interfaces_to_take_down = NULL;

1806

size_t interfaces_to_take_down_size = 0;

1135

1807

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

1136

1808

bool tempdir_created = false;

1137

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1138

1810

const char *seckey = PATHDIR "/" SECKEY;

1139

1811

const char *pubkey = PATHDIR "/" PUBKEY;

1812

char *interfaces_hooks = NULL;

1140

1813

1141

1814

bool gnutls_initialized = false;

1142

1815

bool gpgme_initialized = false;

1143

1816

float delay = 2.5f;

1817

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

1818

retrying the same server again */

1144

1819

1145

1820

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1821

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1827

errno = 0;

1153

1828

ret = setgid(gid);

1154

1829

if(ret == -1){

1155

perror("setgid");

1830

perror_plus("setgid");

1156

1831

}

1157

1832

1158

1833

/* Lower user privileges (temporarily) */

1159

1834

errno = 0;

1160

1835

ret = seteuid(uid);

1161

1836

if(ret == -1){

1162

perror("seteuid");

1837

perror_plus("seteuid");

1163

1838

}

1164

1839

1165

1840

if(quit_now){

1200

1875

.arg = "SECONDS",

1201

1876

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

1202

1877

.group = 2 },

1878

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

1879

.arg = "SECONDS",

1880

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

1881

.group = 2 },

1882

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

1883

.arg = "DIR",

1884

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

1885

.group = 2 },

1203

1886

/*

1204

1887

* These reproduce what we would get without ARGP_NO_HELP

1205

1888

*/

1223

1906

connect_to = arg;

1224

1907

break;

1225

1908

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

1226

interface = arg;

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1227

1914

break;

1228

1915

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

1229

1916

seckey = arg;

1249

1936

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

1250

1937

argp_error(state, "Bad delay");

1251

1938

}

1939

case 132: /* --retry */

1940

errno = 0;

1941

retry_interval = strtod(arg, &tmp);

1942

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

1943

or (retry_interval * 1000) > INT_MAX

1944

or retry_interval < 0){

1945

argp_error(state, "Bad retry interval");

1946

}

1947

break;

1948

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

1949

hookdir = arg;

1252

1950

break;

1253

1951

/*

1254

1952

* These reproduce what we would get without ARGP_NO_HELP

1261

1959

argp_state_help(state, state->out_stream,

1262

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1961

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

1264

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

1962

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

1265

1963

exit(argp_err_exit_status);

1266

1964

break;

1267

1965

default:

1282

1980

case ENOMEM:

1283

1981

default:

1284

1982

errno = ret;

1285

perror("argp_parse");

1983

perror_plus("argp_parse");

1286

1984

exitcode = EX_OSERR;

1287

1985

goto end;

1288

1986

case EINVAL:

1290

1988

goto end;

1291

1989

}

1292

1990

}

1991

1992

{

1993

/* Work around Debian bug #633582:

1994

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

1995

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

1998

struct stat st;

1999

2000

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

2001

int seckey_fd = open(seckey, O_RDONLY);

2002

if(seckey_fd == -1){

2003

perror_plus("open");

2004

} else {

2005

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

2006

if(ret == -1){

2007

perror_plus("fstat");

2008

} else {

2009

if(S_ISREG(st.st_mode)

2010

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

2011

ret = fchown(seckey_fd, uid, gid);

2012

if(ret == -1){

2013

perror_plus("fchown");

2014

}

2015

}

2016

}

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2018

}

2019

}

2020

2021

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

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2023

if(pubkey_fd == -1){

2024

perror_plus("open");

2025

} else {

2026

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

2027

if(ret == -1){

2028

perror_plus("fstat");

2029

} else {

2030

if(S_ISREG(st.st_mode)

2031

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

2032

ret = fchown(pubkey_fd, uid, gid);

2033

if(ret == -1){

2034

perror_plus("fchown");

2035

}

2036

}

2037

}

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2042

/* Lower privileges */

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

2060

}

2061

}

2062

}

2063

2064

/* Run network hooks */

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

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

2073

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

2074

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2079

}

1293

2080

1294

2081

if(not debug){

1295

2082

avahi_set_log_function(empty_log);

1296

2083

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

2084

1323

2085

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

1324

2086

from the signal handler */

1325

2087

/* Initialize the pseudo-RNG for Avahi */

1326

2088

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

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

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

2091

fprintf_plus(stderr,

2092

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

1330

2093

exitcode = EX_UNAVAILABLE;

1331

2094

goto end;

1332

2095

}

1334

2097

sigemptyset(&sigterm_action.sa_mask);

1335

2098

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

1336

2099

if(ret == -1){

1337

perror("sigaddset");

2100

perror_plus("sigaddset");

1338

2101

exitcode = EX_OSERR;

1339

2102

goto end;

1340

2103

}

1341

2104

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

1342

2105

if(ret == -1){

1343

perror("sigaddset");

2106

perror_plus("sigaddset");

1344

2107

exitcode = EX_OSERR;

1345

2108

goto end;

1346

2109

}

1347

2110

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

1348

2111

if(ret == -1){

1349

perror("sigaddset");

2112

perror_plus("sigaddset");

1350

2113

exitcode = EX_OSERR;

1351

2114

goto end;

1352

2115

}

1356

2119

*/

1357

2120

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

1358

2121

if(ret == -1){

1359

perror("sigaction");

2122

perror_plus("sigaction");

1360

2123

return EX_OSERR;

1361

2124

}

1362

2125

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

2126

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

1364

2127

if(ret == -1){

1365

perror("sigaction");

2128

perror_plus("sigaction");

1366

2129

exitcode = EX_OSERR;

1367

2130

goto end;

1368

2131

}

1369

2132

}

1370

2133

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

1371

2134

if(ret == -1){

1372

perror("sigaction");

2135

perror_plus("sigaction");

1373

2136

return EX_OSERR;

1374

2137

}

1375

2138

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

2139

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

1377

2140

if(ret == -1){

1378

perror("sigaction");

2141

perror_plus("sigaction");

1379

2142

exitcode = EX_OSERR;

1380

2143

goto end;

1381

2144

}

1382

2145

}

1383

2146

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

1384

2147

if(ret == -1){

1385

perror("sigaction");

2148

perror_plus("sigaction");

1386

2149

return EX_OSERR;

1387

2150

}

1388

2151

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

2152

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

1390

2153

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

1395

}

1396

1397

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

#ifdef __linux__

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1420

ret = klogctl(8, NULL, 5);

1421

bool restore_loglevel = true;

1422

if(ret == -1){

1423

restore_loglevel = false;

1424

perror("klogctl");

1425

}

1426

#endif /* __linux__ */

1427

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

if(sd < 0){

1430

perror("socket");

1431

exitcode = EX_OSERR;

1432

#ifdef __linux__

1433

if(restore_loglevel){

1434

ret = klogctl(7, NULL, 0);

1435

if(ret == -1){

1436

perror("klogctl");

1437

}

1438

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

goto end;

1447

}

1448

strcpy(network.ifr_name, interface);

1449

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

1450

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1452

#ifdef __linux__

1453

if(restore_loglevel){

1454

ret = klogctl(7, NULL, 0);

1455

if(ret == -1){

1456

perror("klogctl");

1457

}

1458

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1467

goto end;

1468

}

1469

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

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

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

1473

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1477

#ifdef __linux__

1478

if(restore_loglevel){

1479

ret = klogctl(7, NULL, 0);

1480

if(ret == -1){

1481

perror("klogctl");

2154

perror_plus("sigaction");

2155

exitcode = EX_OSERR;

2156

goto end;

2157

}

2158

}

2159

2160

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

2161

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2163

/* Look for any good interfaces */

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2165

alphasort);

2166

if(ret >= 1){

2167

/* Add all found interfaces to interfaces list */

2168

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

2169

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

2170

direntries[i]->d_name);

2171

if(ret_errno != 0){

2172

errno = ret_errno;

2173

perror_plus("argz_add");

2174

continue;

2175

}

2176

if(debug){

2177

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

2178

direntries[i]->d_name);

2179

}

2180

}

2181

free(direntries);

2182

} else {

2183

free(direntries);

2184

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

2185

exitcode = EXIT_FAILURE;

2186

goto end;

2187

}

2188

}

2189

2190

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

2191

{

2192

char *interface = NULL;

2193

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

2194

interface))){

2195

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

2196

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

2197

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

2198

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

2199

interface);

2200

interface = NULL;

2201

while((interface = argz_next(mc.interfaces,

2202

mc.interfaces_size, interface))){

2203

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

2204

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

2205

interface);

2206

interface = NULL;

1482

2207

}

1483

2208

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

goto end;

1492

}

1493

}

1494

/* sleep checking until interface is running */

1495

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

1496

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

1497

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_RUNNING){

1500

2209

break;

1501

2210

}

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

ret = nanosleep(&sleeptime, NULL);

1504

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

1505

perror("nanosleep");

1506

}

1507

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1514

}

1515

#ifdef __linux__

1516

if(restore_loglevel){

1517

/* Restores kernel loglevel to default */

1518

ret = klogctl(7, NULL, 0);

1519

if(ret == -1){

1520

perror("klogctl");

1521

}

1522

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

2211

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2213

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2216

perror_plus("Failed to bring up interface");

2217

} else {

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2223

perror_plus("argz_add");

2224

}

2225

}

2226

}

2227

}

2228

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

2229

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

2230

}

2231

}

2232

2233

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

2234

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

2235

if(debug){

2236

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

2237

mc.interfaces);

2238

}

2239

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

1539

2240

}

1540

2241

1541

2242

if(quit_now){

1542

2243

goto end;

1543

2244

}

1544

2245

1545

ret = init_gnutls_global(pubkey, seckey);

2246

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

1546

2247

if(ret == -1){

1547

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

2248

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

1548

2249

exitcode = EX_UNAVAILABLE;

1549

2250

goto end;

1550

2251

} else {

1555

2256

goto end;

1556

2257

}

1557

2258

2259

if(mkdtemp(tempdir) == NULL){

2260

perror_plus("mkdtemp");

2261

goto end;

2262

}

1558

2263

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2264

1565

2265

if(quit_now){

1566

2266

goto end;

1567

2267

}

1568

2268

1569

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

1570

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

2269

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

2270

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

1571

2271

exitcode = EX_UNAVAILABLE;

1572

2272

goto end;

1573

2273

} else {

1582

2282

/* Connect directly, do not use Zeroconf */

1583

2283

/* (Mainly meant for debugging) */

1584

2284

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

2285

1585

2286

if(address == NULL){

1586

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

2287

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

1587

2288

exitcode = EX_USAGE;

1588

2289

goto end;

1589

2290

}

1592

2293

goto end;

1593

2294

}

1594

2295

1595

uint16_t port;

2296

in_port_t port;

1596

2297

errno = 0;

1597

2298

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

1598

2299

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

1599

or tmpmax != (uint16_t)tmpmax){

1600

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

2300

or tmpmax != (in_port_t)tmpmax){

2301

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

1601

2302

exitcode = EX_USAGE;

1602

2303

goto end;

1603

2304

}

1604

2305

1605

2306

if(quit_now){

1606

2307

goto end;

1607

2308

}

1608

2309

1609

port = (uint16_t)tmpmax;

2310

port = (in_port_t)tmpmax;

1610

2311

*address = '\0';

1611

address = connect_to;

1612

2312

/* Colon in address indicates IPv6 */

1613

2313

int af;

1614

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

2314

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

1615

2315

af = AF_INET6;

2316

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

2317

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

2318

{

2319

connect_to++;

2320

address[-1] = '\0';

2321

}

1616

2322

} else {

1617

2323

af = AF_INET;

1618

2324

}

2325

address = connect_to;

1619

2326

1620

2327

if(quit_now){

1621

2328

goto end;

1622

2329

}

1623

2330

1624

2331

while(not quit_now){

1625

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

2332

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

2333

&mc);

1626

2334

if(quit_now or ret == 0){

1627

2335

break;

1628

2336

}

1629

sleep(15);

1630

};

1631

2337

if(debug){

2338

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

2339

(int)retry_interval);

2340

}

2341

sleep((unsigned int)retry_interval);

2342

}

2343

1632

2344

if (not quit_now){

1633

2345

exitcode = EXIT_SUCCESS;

1634

2346

}

1635

2347

1636

2348

goto end;

1637

2349

}

1638

2350

1650

2362

config.publish_domain = 0;

1651

2363

1652

2364

/* Allocate a new server */

1653

mc.server = avahi_server_new(avahi_simple_poll_get

1654

(mc.simple_poll), &config, NULL,

1655

NULL, &error);

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

1656

2367

1657

2368

/* Free the Avahi configuration data */

1658

2369

avahi_server_config_free(&config);

1660

2371

1661

2372

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

1662

2373

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2374

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

2375

avahi_strerror(ret_errno));

1665

2376

exitcode = EX_UNAVAILABLE;

1666

2377

goto end;

1667

2378

}

1673

2384

/* Create the Avahi service browser */

1674

2385

sb = avahi_s_service_browser_new(mc.server, if_index,

1675

2386

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

NULL, 0, browse_callback, NULL);

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

1677

2389

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2390

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

2391

avahi_strerror(avahi_server_errno(mc.server)));

1680

2392

exitcode = EX_UNAVAILABLE;

1681

2393

goto end;

1682

2394

}

1688

2400

/* Run the main loop */

1689

2401

1690

2402

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2403

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

2404

}

2405

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

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

2408

if(debug){

2409

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

2410

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

2411

}

1695

2412

1696

2413

end:

1697

2414

1698

2415

if(debug){

1699

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

2416

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

1700

2417

}

1701

2418

1702

2419

/* Cleanup things */

2420

free(mc.interfaces);

2421

1703

2422

if(sb != NULL)

1704

2423

avahi_s_service_browser_free(sb);

1705

2424

1706

2425

if(mc.server != NULL)

1707

2426

avahi_server_free(mc.server);

1708

2427

1709

if(mc.simple_poll != NULL)

1710

avahi_simple_poll_free(mc.simple_poll);

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

1711

2430

1712

2431

if(gnutls_initialized){

1713

2432

gnutls_certificate_free_credentials(mc.cred);

1719

2438

gpgme_release(mc.ctx);

1720

2439

}

1721

2440

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

2441

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

2442

has seen */

2443

if(mc.current_server != NULL){

2444

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

2445

while(mc.current_server != NULL){

2446

server *next = mc.current_server->next;

2447

free(mc.current_server);

2448

mc.current_server = next;

1729

2449

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2450

}

2451

2452

/* Re-raise priviliges */

2453

{

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

1739

2470

}

1740

2471

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

2472

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

2473

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

2474

" down\n");

1750

2475

}

1751

2476

}

2477

2478

lower_privileges_permanently();

1752

2479

}

1753

2480

1754

/* Removes the temp directory used by GPGME */

2481

free(interfaces_to_take_down);

2482

free(interfaces_hooks);

2483

2484

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

1755

2485

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

2486

struct dirent **direntries = NULL;

2487

struct dirent *direntry = NULL;

2488

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

2489

alphasort);

2490

if (numentries > 0){

2491

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

2492

direntry = direntries[i];

1776

2493

char *fullname = NULL;

1777

2494

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

1778

2495

direntry->d_name);

1779

2496

if(ret < 0){

1780

perror("asprintf");

2497

perror_plus("asprintf");

1781

2498

continue;

1782

2499

}

1783

2500

ret = remove(fullname);

1784

2501

if(ret == -1){

1785

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

1786

strerror(errno));

2502

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

2503

strerror(errno));

1787

2504

}

1788

2505

free(fullname);

1789

2506

}

1790

closedir(d);

2507

}

2508

2509

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

2510

free(direntries);

2511

if (numentries == -1){

2512

perror_plus("scandir");

1791

2513

}

1792

2514

ret = rmdir(tempdir);

1793

2515

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

1794

perror("rmdir");

2516

perror_plus("rmdir");

1795

2517

}

1796

2518

}

1797

2519

1802

2524

&old_sigterm_action,

1803

2525

NULL));

1804

2526

if(ret == -1){

1805

perror("sigaction");

2527

perror_plus("sigaction");

1806

2528

}

1807

2529

do {

1808

2530

ret = raise(signal_received);

1809

2531

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

1810

2532

if(ret != 0){

1811

perror("raise");

2533

perror_plus("raise");

1812

2534

abort();

1813

2535

}

1814

2536

TEMP_FAILURE_RETRY(pause());