/mandos/release : revision 237.7.42

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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

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setgid(), pause() */

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

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

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

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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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 add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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int ret;

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

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if(new_server == NULL){

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197

perror_plus("malloc");

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return false;

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return -1;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return false;

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return -1;

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}

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/* Special case of first server */

228

if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

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} else {

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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mc.current_server->prev = new_server;

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}

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

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

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if(ret == -1){

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222

perror_plus("clock_gettime");

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return false;

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return -1;

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}

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return true;

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return 0;

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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, const char *pubkey,

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const char *tempdir, mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

307

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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292

}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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300

}

319

301

if(engine_info == NULL){

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

321

tempdir);

302

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

322

303

return false;

323

304

}

324

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325

306

/* Create new GPGME "context" */

326

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

307

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

327

308

if(rc != GPG_ERR_NO_ERROR){

328

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

329

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

330

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

331

311

return false;

332

312

}

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313

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324

*/

345

325

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

326

size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

327

char **plaintext){

349

328

gpgme_data_t dh_crypto, dh_plain;

350

329

gpgme_error_t rc;

351

330

ssize_t ret;

353

332

ssize_t plaintext_length = 0;

354

333

355

334

if(debug){

356

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

335

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

357

336

}

358

337

359

338

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

360

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

361

340

0);

362

341

if(rc != GPG_ERR_NO_ERROR){

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

365

344

return -1;

366

345

}

367

346

368

347

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

369

348

rc = gpgme_data_new(&dh_plain);

370

349

if(rc != GPG_ERR_NO_ERROR){

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

374

352

gpgme_data_release(dh_crypto);

375

353

return -1;

376

354

}

377

355

378

356

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

379

357

data buffer */

380

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

358

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

381

359

if(rc != GPG_ERR_NO_ERROR){

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

384

362

plaintext_length = -1;

385

363

if(debug){

386

364

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

365

result = gpgme_op_decrypt_result(mc.ctx);

388

366

if(result == NULL){

389

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

367

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

390

368

} else {

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

395

373

if(result->file_name != NULL){

396

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

374

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

397

375

}

398

376

gpgme_recipient_t recipient;

399

377

recipient = result->recipients;

400

378

while(recipient != NULL){

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

408

385

recipient = recipient->next;

409

386

}

410

387

}

413

390

}

414

391

415

392

if(debug){

416

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

393

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

417

394

}

418

395

419

396

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

426

403

*plaintext = NULL;

427

404

while(true){

428

405

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

431

408

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

435

412

}

436

413

437

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

427

}

451

428

452

429

if(debug){

453

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

430

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

454

431

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

455

432

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

456

433

}

468

445

}

469

446

470

447

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

448

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

449

-Wunreachable-code */

472

450

if(ret == NULL)

473

451

ret = "(unknown)";

474

452

return ret;

477

455

/* GnuTLS log function callback */

478

456

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

479

457

const char* string){

480

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

458

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

481

459

}

482

460

483

461

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

462

const char *seckeyfilename){

486

463

int ret;

487

464

488

465

if(debug){

489

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

466

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

490

467

}

491

468

492

469

ret = gnutls_global_init();

493

470

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

496

473

return -1;

497

474

}

498

475

505

482

}

506

483

507

484

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

486

if(ret != GNUTLS_E_SUCCESS){

510

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

511

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

512

489

gnutls_global_deinit();

513

490

return -1;

514

491

}

515

492

516

493

if(debug){

517

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

494

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

495

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

496

seckeyfilename);

521

497

}

522

498

523

499

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

500

(mc.cred, pubkeyfilename, seckeyfilename,

525

501

GNUTLS_OPENPGP_FMT_BASE64);

526

502

if(ret != GNUTLS_E_SUCCESS){

527

fprintf_plus(stderr,

528

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

529

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

530

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

531

safer_gnutls_strerror(ret));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

532

508

goto globalfail;

533

509

}

534

510

535

511

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

512

ret = gnutls_dh_params_init(&mc.dh_params);

537

513

if(ret != GNUTLS_E_SUCCESS){

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

514

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

515

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

541

516

goto globalfail;

542

517

}

543

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

518

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

544

519

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

547

522

goto globalfail;

548

523

}

549

524

550

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

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

526

552

527

return 0;

553

528

554

529

globalfail:

555

530

556

gnutls_certificate_free_credentials(mc->cred);

531

gnutls_certificate_free_credentials(mc.cred);

557

532

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

533

gnutls_dh_params_deinit(mc.dh_params);

559

534

return -1;

560

535

}

561

536

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

537

static int init_gnutls_session(gnutls_session_t *session){

564

538

int ret;

565

539

/* GnuTLS session creation */

566

540

do {

570

544

}

571

545

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

572

546

if(ret != GNUTLS_E_SUCCESS){

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

576

549

}

577

550

578

551

{

579

552

const char *err;

580

553

do {

581

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

554

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

582

555

if(quit_now){

583

556

gnutls_deinit(*session);

584

557

return -1;

585

558

}

586

559

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

587

560

if(ret != GNUTLS_E_SUCCESS){

588

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

589

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

590

safer_gnutls_strerror(ret));

561

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

562

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

563

safer_gnutls_strerror(ret));

591

564

gnutls_deinit(*session);

592

565

return -1;

593

566

}

595

568

596

569

do {

597

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

571

mc.cred);

599

572

if(quit_now){

600

573

gnutls_deinit(*session);

601

574

return -1;

602

575

}

603

576

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

604

577

if(ret != GNUTLS_E_SUCCESS){

605

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

606

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

607

580

gnutls_deinit(*session);

608

581

return -1;

609

582

}

611

584

/* ignore client certificate if any. */

612

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

586

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

588

616

589

return 0;

617

590

}

621

594

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

622

595

623

596

/* Called when a Mandos server is found */

624

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

597

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

625

598

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

599

int af){

627

600

int ret, tcp_sd = -1;

628

601

ssize_t sret;

629

602

union {

654

627

pf = PF_INET;

655

628

break;

656

629

default:

657

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

630

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

658

631

errno = EINVAL;

659

632

return -1;

660

633

}

661

634

662

ret = init_gnutls_session(&session, mc);

635

ret = init_gnutls_session(&session);

663

636

if(ret != 0){

664

637

return -1;

665

638

}

666

639

667

640

if(debug){

668

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

669

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

641

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

642

"\n", ip, port);

670

643

}

671

644

672

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

698

671

}

699

672

if(ret == 0){

700

673

int e = errno;

701

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

674

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

702

675

errno = e;

703

676

goto mandos_end;

704

677

}

705

678

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

707

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

684

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

709

-Wunreachable-code*/

685

-Wunreachable-code*/

710

686

if(if_index == AVAHI_IF_UNSPEC){

711

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

712

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

713

689

errno = EINVAL;

714

690

goto mandos_end;

715

691

}

733

709

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

734

710

perror_plus("if_indextoname");

735

711

} else {

736

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

737

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

712

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

713

ip, interface, port);

738

714

}

739

715

} else {

740

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

741

ip, (uintmax_t)port);

716

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

717

port);

742

718

}

743

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

754

730

perror_plus("inet_ntop");

755

731

} else {

756

732

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

757

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

733

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

758

734

}

759

735

}

760

736

}

788

764

while(true){

789

765

size_t out_size = strlen(out);

790

766

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

791

out_size - written));

767

out_size - written));

792

768

if(ret == -1){

793

769

int e = errno;

794

770

perror_plus("write");

814

790

}

815

791

816

792

if(debug){

817

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

793

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

818

794

}

819

795

820

796

if(quit_now){

822

798

goto mandos_end;

823

799

}

824

800

825

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

826

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

827

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

828

gnutls_transport_set_ptr(session,

829

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

830

803

831

804

if(quit_now){

832

805

errno = EINTR;

843

816

844

817

if(ret != GNUTLS_E_SUCCESS){

845

818

if(debug){

846

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

819

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

847

820

gnutls_perror(ret);

848

821

}

849

822

errno = EPROTO;

853

826

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

854

827

855

828

if(debug){

856

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

857

" %s\n", ip);

829

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

830

ip);

858

831

}

859

832

860

833

while(true){

865

838

}

866

839

867

840

buffer_capacity = incbuffer(&buffer, buffer_length,

868

buffer_capacity);

841

buffer_capacity);

869

842

if(buffer_capacity == 0){

870

843

int e = errno;

871

844

perror_plus("incbuffer");

898

871

}

899

872

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

900

873

if(ret < 0){

901

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

902

"***\n");

874

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

903

875

gnutls_perror(ret);

904

876

errno = EPROTO;

905

877

goto mandos_end;

906

878

}

907

879

break;

908

880

default:

909

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

910

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

911

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

912

884

errno = EIO;

913

885

goto mandos_end;

918

890

}

919

891

920

892

if(debug){

921

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

893

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

922

894

}

923

895

924

896

if(quit_now){

936

908

937

909

if(buffer_length > 0){

938

910

ssize_t decrypted_buffer_size;

939

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer, mc);

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

941

914

if(decrypted_buffer_size >= 0){

942

915

943

916

written = 0;

953

926

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

954

927

int e = errno;

955

928

if(debug){

956

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

957

strerror(errno));

929

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

930

strerror(errno));

958

931

}

959

932

errno = e;

960

933

goto mandos_end;

1004

977

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

979

flags,

1007

void* mc){

1008

if(r == NULL){

1009

return;

1010

}

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1011

982

1012

983

/* Called whenever a service has been resolved successfully or

1013

984

timed out */

1019

990

switch(event){

1020

991

default:

1021

992

case AVAHI_RESOLVER_FAILURE:

1022

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

1023

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

1024

domain,

1025

avahi_strerror(avahi_server_errno

1026

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

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1027

996

break;

1028

997

1029

998

case AVAHI_RESOLVER_FOUND:

1031

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1032

1001

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

1033

1002

if(debug){

1034

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

1035

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

1036

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

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1037

1006

}

1038

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

1039

interface,

1040

avahi_proto_to_af(proto),

1041

mc);

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1042

1009

if(ret == 0){

1043

avahi_simple_poll_quit(simple_poll);

1010

avahi_simple_poll_quit(mc.simple_poll);

1044

1011

} else {

1045

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

1046

avahi_proto_to_af(proto),

1047

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

1048

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

1049

" list\n", name);

1050

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1051

1014

}

1052

1015

}

1053

1016

}

1063

1026

const char *domain,

1064

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1065

1028

flags,

1066

void* mc){

1067

if(b == NULL){

1068

return;

1069

}

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1070

1031

1071

1032

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

1072

1033

is removed from the LAN */

1079

1040

default:

1080

1041

case AVAHI_BROWSER_FAILURE:

1081

1042

1082

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

1083

avahi_strerror(avahi_server_errno

1084

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

1085

avahi_simple_poll_quit(simple_poll);

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1086

1046

return;

1087

1047

1088

1048

case AVAHI_BROWSER_NEW:

1091

1051

the callback function is called the Avahi server will free the

1092

1052

resolver for us. */

1093

1053

1094

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

1095

interface, protocol, name, type,

1096

domain, protocol, 0,

1097

resolve_callback, mc) == NULL)

1098

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

1099

" %s\n", name,

1100

avahi_strerror(avahi_server_errno

1101

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

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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

1102

1059

break;

1103

1060

1104

1061

case AVAHI_BROWSER_REMOVE:

1107

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1108

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1109

1066

if(debug){

1110

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

1111

" searching...\n");

1067

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

1112

1068

}

1113

1069

break;

1114

1070

}

1123

1079

signal_received = sig;

1124

1080

int old_errno = errno;

1125

1081

/* set main loop to exit */

1126

if(simple_poll != NULL){

1127

avahi_simple_poll_quit(simple_poll);

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1128

1084

}

1129

1085

errno = old_errno;

1130

1086

}

1131

1087

1132

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

1133

int ret;

1134

error_t ret_errno;

1135

1136

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

1137

if(s < 0){

1138

ret_errno = errno;

1139

perror_plus("socket");

1140

errno = ret_errno;

1141

return false;

1142

}

1143

strcpy(ifr->ifr_name, ifname);

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

if(ret == -1){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1146

1144

if(debug){

1147

ret_errno = errno;

1148

perror_plus("ioctl SIOCGIFFLAGS");

1149

errno = ret_errno;

1145

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

1146

flagstring, if_entry->d_name);

1150

1147

}

1151

return false;

1148

free(flagstring);

1149

return 0;

1152

1150

}

1153

return true;

1154

}

1155

1156

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

1157

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1158

1153

/* Reject the loopback device */

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1160

1155

if(debug){

1161

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

1162

ifname);

1156

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

1157

if_entry->d_name);

1163

1158

}

1164

return false;

1159

return 0;

1165

1160

}

1166

1161

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

1167

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

1162

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

1168

1163

if(debug){

1169

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

1170

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

1164

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

1165

if_entry->d_name);

1171

1166

}

1172

return true;

1167

return 1;

1173

1168

}

1174

1169

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

1175

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

1170

if(not (flags & IFF_BROADCAST)){

1176

1171

if(debug){

1177

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1178

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

1172

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

1173

if_entry->d_name);

1179

1174

}

1180

return false;

1175

return 0;

1181

1176

}

1182

1177

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

1183

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1184

1179

if(debug){

1185

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

1186

ifname);

1180

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

1181

if_entry->d_name);

1187

1182

}

1188

return false;

1183

return 0;

1189

1184

}

1190

1191

1185

/* Accept this device */

1192

1186

if(debug){

1193

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

1194

}

1195

return true;

1196

}

1197

1198

/*

1199

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

1200

* corresponds to an acceptable network device.

1201

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

1202

*/

1203

int good_interface(const struct dirent *if_entry){

1204

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

1205

return 0;

1206

}

1207

1208

struct ifreq ifr;

1209

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

1210

if(debug){

1211

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

1212

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

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1187

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

1188

if_entry->d_name);

1219

1189

}

1220

1190

return 1;

1221

1191

}

1222

1192

1223

/*

1224

* This function determines if a network interface is up.

1225

*/

1226

bool interface_is_up(const char *interface){

1227

struct ifreq ifr;

1228

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

1229

if(debug){

1230

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

1231

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

1232

}

1233

return false;

1234

}

1235

1236

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

1237

}

1238

1239

/*

1240

* This function determines if a network interface is running

1241

*/

1242

bool interface_is_running(const char *interface){

1243

struct ifreq ifr;

1244

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

1245

if(debug){

1246

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

1247

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

1248

}

1249

return false;

1250

}

1251

1252

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

1253

}

1254

1255

1193

int notdotentries(const struct dirent *direntry){

1256

1194

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

1257

1195

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

1263

1201

return 1;

1264

1202

}

1265

1203

1266

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

1267

int runnable_hook(const struct dirent *direntry){

1268

int ret;

1269

size_t sret;

1270

struct stat st;

1271

1272

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

1273

/* Empty name? */

1274

return 0;

1275

}

1276

1277

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

1278

"abcdefghijklmnopqrstuvwxyz"

1279

"0123456789"

1280

"_-");

1281

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

1282

/* Contains non-allowed characters */

1283

if(debug){

1284

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

1285

direntry->d_name);

1286

}

1287

return 0;

1288

}

1289

1290

char *fullname = NULL;

1291

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

1292

if(ret < 0){

1293

perror_plus("asprintf");

1294

return 0;

1295

}

1296

1297

ret = stat(fullname, &st);

1298

if(ret == -1){

1299

if(debug){

1300

perror_plus("Could not stat hook");

1301

}

1302

return 0;

1303

}

1304

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

1305

/* Not a regular file */

1306

if(debug){

1307

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

1308

direntry->d_name);

1309

}

1310

return 0;

1311

}

1312

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

1313

/* Not executable */

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 0;

1319

}

1320

if(debug){

1321

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

1322

direntry->d_name);

1323

}

1324

return 1;

1325

}

1326

1327

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

mandos_context *mc){

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1329

1205

int ret;

1330

1206

struct timespec now;

1331

1207

struct timespec waited_time;

1332

1208

intmax_t block_time;

1333

1209

1334

1210

while(true){

1335

if(mc->current_server == NULL){

1211

if(mc.current_server == NULL){

1336

1212

if (debug){

1337

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

1338

" No timeout!\n");

1213

fprintf(stderr,

1214

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

1339

1215

}

1340

1216

ret = avahi_simple_poll_iterate(s, -1);

1341

1217

} else {

1342

1218

if (debug){

1343

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

1344

" it, or wait\n");

1219

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

1220

" or wait\n");

1345

1221

}

1346

1222

/* the current time */

1347

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1352

1228

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

1353

1229

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

1354

1230

waited_time.tv_sec = (now.tv_sec

1355

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

1231

- mc.current_server->last_seen.tv_sec);

1356

1232

waited_time.tv_nsec = (now.tv_nsec

1357

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

1233

- mc.current_server->last_seen.tv_nsec);

1358

1234

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

1359

1235

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

1360

1236

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

1363

1239

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

1364

1240

1365

1241

if (debug){

1366

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

1367

block_time);

1242

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

1368

1243

}

1369

1244

1370

1245

if(block_time <= 0){

1371

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

1372

mc->current_server->port,

1373

mc->current_server->if_index,

1374

mc->current_server->af, mc);

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1375

1250

if(ret == 0){

1376

avahi_simple_poll_quit(s);

1251

avahi_simple_poll_quit(mc.simple_poll);

1377

1252

return 0;

1378

1253

}

1379

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1380

&mc->current_server->last_seen);

1255

&mc.current_server->last_seen);

1381

1256

if(ret == -1){

1382

1257

perror_plus("clock_gettime");

1383

1258

return -1;

1384

1259

}

1385

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

1260

mc.current_server = mc.current_server->next;

1386

1261

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

1387

1262

servers, but don't block */

1388

1263

}

1390

1265

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

1391

1266

}

1392

1267

if(ret != 0){

1393

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

1268

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

1394

1269

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

1395

1270

}

1396

1271

}

1397

1272

}

1398

1273

}

1399

1274

1400

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

1401

error_t raise_privileges(void){

1402

error_t old_errno = errno;

1403

error_t ret_errno = 0;

1404

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

1405

ret_errno = errno;

1406

perror_plus("seteuid");

1407

}

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

1412

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

1413

error_t raise_privileges_permanently(void){

1414

error_t old_errno = errno;

1415

error_t ret_errno = raise_privileges();

1416

if(ret_errno != 0){

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

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

1421

ret_errno = errno;

1422

perror_plus("seteuid");

1423

}

1424

errno = old_errno;

1425

return ret_errno;

1426

}

1427

1428

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

1429

error_t lower_privileges(void){

1430

error_t old_errno = errno;

1431

error_t ret_errno = 0;

1432

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

1433

ret_errno = errno;

1434

perror_plus("seteuid");

1435

}

1436

errno = old_errno;

1437

return ret_errno;

1438

}

1439

1440

/* Lower privileges permanently */

1441

error_t lower_privileges_permanently(void){

1442

error_t old_errno = errno;

1443

error_t ret_errno = 0;

1444

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

1445

ret_errno = errno;

1446

perror_plus("setuid");

1447

}

1448

errno = old_errno;

1449

return ret_errno;

1450

}

1451

1452

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

1453

const float delay){

1454

struct dirent **direntries;

1455

struct dirent *direntry;

1456

int ret;

1457

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

1458

alphasort);

1459

if(numhooks == -1){

1460

if(errno == ENOENT){

1461

if(debug){

1462

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

1463

" found\n", hookdir);

1464

}

1465

} else {

1466

perror_plus("scandir");

1467

}

1468

} else {

1469

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

1470

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

1471

direntry = direntries[i];

1472

char *fullname = NULL;

1473

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

1474

if(ret < 0){

1475

perror_plus("asprintf");

1476

continue;

1477

}

1478

if(debug){

1479

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

1480

direntry->d_name);

1481

}

1482

pid_t hook_pid = fork();

1483

if(hook_pid == 0){

1484

/* Child */

1485

/* Raise privileges */

1486

raise_privileges_permanently();

1487

/* Set group */

1488

errno = 0;

1489

ret = setgid(0);

1490

if(ret == -1){

1491

perror_plus("setgid");

1492

}

1493

/* Reset supplementary groups */

1494

errno = 0;

1495

ret = setgroups(0, NULL);

1496

if(ret == -1){

1497

perror_plus("setgroups");

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1502

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

1503

if(ret == -1){

1504

perror_plus("setenv");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

perror_plus("setenv");

1510

_exit(EX_OSERR);

1511

}

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

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

1518

if(ret == -1){

1519

perror_plus("setenv");

1520

_exit(EX_OSERR);

1521

}

1522

char *delaystring;

1523

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

1524

if(ret == -1){

1525

perror_plus("asprintf");

1526

_exit(EX_OSERR);

1527

}

1528

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

1529

if(ret == -1){

1530

free(delaystring);

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1534

free(delaystring);

1535

if(connect_to != NULL){

1536

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

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

}

1542

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

1543

perror_plus("execl");

1544

_exit(EXIT_FAILURE);

1545

}

1546

} else {

1547

int status;

1548

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

1549

perror_plus("waitpid");

1550

free(fullname);

1551

continue;

1552

}

1553

if(WIFEXITED(status)){

1554

if(WEXITSTATUS(status) != 0){

1555

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

1556

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

1557

WEXITSTATUS(status));

1558

free(fullname);

1559

continue;

1560

}

1561

} else if(WIFSIGNALED(status)){

1562

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

1563

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

1564

WTERMSIG(status));

1565

free(fullname);

1566

continue;

1567

} else {

1568

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

1569

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

1570

free(fullname);

1571

continue;

1572

}

1573

}

1574

free(fullname);

1575

if(debug){

1576

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

1577

direntry->d_name);

1578

}

1579

}

1580

close(devnull);

1581

}

1582

return true;

1583

}

1584

1585

error_t bring_up_interface(const char *const interface,

1586

const float delay){

1587

int sd = -1;

1588

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1591

struct ifreq network;

1592

unsigned int if_index = if_nametoindex(interface);

1593

if(if_index == 0){

1594

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

1595

errno = old_errno;

1596

return ENXIO;

1597

}

1598

1599

if(quit_now){

1600

errno = old_errno;

1601

return EINTR;

1602

}

1603

1604

if(not interface_is_up(interface)){

1605

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

1606

ret_errno = errno;

1607

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

1608

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

1609

return ret_errno;

1610

}

1611

network.ifr_flags |= IFF_UP;

1612

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1615

ret_errno = errno;

1616

perror_plus("socket");

1617

errno = old_errno;

1618

return ret_errno;

1619

}

1620

1621

if(quit_now){

1622

close(sd);

1623

errno = old_errno;

1624

return EINTR;

1625

}

1626

1627

if(debug){

1628

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

1629

interface);

1630

}

1631

1632

/* Raise priviliges */

1633

raise_privileges();

1634

1635

#ifdef __linux__

1636

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1637

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

1638

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

1639

bool restore_loglevel = true;

1640

if(ret_linux == -1){

1641

restore_loglevel = false;

1642

perror_plus("klogctl");

1643

}

1644

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

1647

#ifdef __linux__

1648

if(restore_loglevel){

1649

ret_linux = klogctl(7, NULL, 0);

1650

if(ret_linux == -1){

1651

perror_plus("klogctl");

1652

}

1653

}

1654

#endif /* __linux__ */

1655

1656

/* Lower privileges */

1657

lower_privileges();

1658

1659

/* Close the socket */

1660

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

1661

if(ret == -1){

1662

perror_plus("close");

1663

}

1664

1665

if(ret_setflags == -1){

1666

errno = ret_errno;

1667

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

errno = old_errno;

1669

return ret_errno;

1670

}

1671

} else if(debug){

1672

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

1673

interface);

1674

}

1675

1676

/* Sleep checking until interface is running.

1677

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

1678

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

1679

if(interface_is_running(interface)){

1680

break;

1681

}

1682

struct timespec sleeptime = { .tv_nsec = 250000000 };

1683

ret = nanosleep(&sleeptime, NULL);

1684

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

1685

perror_plus("nanosleep");

1686

}

1687

}

1688

1689

errno = old_errno;

1690

return 0;

1691

}

1692

1693

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1698

struct ifreq network;

1699

unsigned int if_index = if_nametoindex(interface);

1700

if(if_index == 0){

1701

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

1702

errno = old_errno;

1703

return ENXIO;

1704

}

1705

if(interface_is_up(interface)){

1706

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

1707

ret_errno = errno;

1708

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

1709

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

1710

return ret_errno;

1711

}

1712

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

1713

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1716

ret_errno = errno;

1717

perror_plus("socket");

1718

errno = old_errno;

1719

return ret_errno;

1720

}

1721

1722

if(debug){

1723

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

1724

interface);

1725

}

1726

1727

/* Raise priviliges */

1728

raise_privileges();

1729

1730

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

1731

ret_errno = errno;

1732

1733

/* Lower privileges */

1734

lower_privileges();

1735

1736

/* Close the socket */

1737

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

1738

if(ret == -1){

1739

perror_plus("close");

1740

}

1741

1742

if(ret_setflags == -1){

1743

errno = ret_errno;

1744

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

errno = old_errno;

1746

return ret_errno;

1747

}

1748

} else if(debug){

1749

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

1750

interface);

1751

}

1752

1753

errno = old_errno;

1754

return 0;

1755

}

1756

1757

1275

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

1758

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

1759

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

1760

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

1761

.interfaces = NULL, .interfaces_size = 0 };

1762

1276

AvahiSServiceBrowser *sb = NULL;

1763

error_t ret_errno;

1277

int error;

1764

1278

int ret;

1765

1279

intmax_t tmpmax;

1766

1280

char *tmp;

1767

1281

int exitcode = EXIT_SUCCESS;

1768

char *interfaces_to_take_down = NULL;

1769

size_t interfaces_to_take_down_size = 0;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1770

1288

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

1771

1289

bool tempdir_created = false;

1772

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1773

1291

const char *seckey = PATHDIR "/" SECKEY;

1774

1292

const char *pubkey = PATHDIR "/" PUBKEY;

1775

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1777

1293

1778

1294

bool gnutls_initialized = false;

1779

1295

bool gpgme_initialized = false;

1841

1357

.group = 2 },

1842

1358

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

1843

1359

.arg = "SECONDS",

1844

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

1845

.group = 2 },

1846

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

1847

.arg = "DIR",

1848

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

1360

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

1849

1361

.group = 2 },

1850

1362

/*

1851

1363

* These reproduce what we would get without ARGP_NO_HELP

1870

1382

connect_to = arg;

1871

1383

break;

1872

1384

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

1873

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

1874

arg, (int)',');

1875

if(ret_errno != 0){

1876

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

1877

}

1385

interface = arg;

1878

1386

break;

1879

1387

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

1880

1388

seckey = arg;

1909

1417

argp_error(state, "Bad retry interval");

1910

1418

}

1911

1419

break;

1912

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

1913

hookdir = arg;

1914

break;

1915

1420

/*

1916

1421

* These reproduce what we would get without ARGP_NO_HELP

1917

1422

*/

1923

1428

argp_state_help(state, state->out_stream,

1924

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1925

1430

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

1926

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

1431

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

1927

1432

exit(argp_err_exit_status);

1928

1433

break;

1929

1434

default:

1956

1461

{

1957

1462

/* Work around Debian bug #633582:

1958

1463

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

1464

struct stat st;

1959

1465

1960

1466

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

1962

struct stat st;

1963

1964

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

1965

int seckey_fd = open(seckey, O_RDONLY);

1966

if(seckey_fd == -1){

1967

perror_plus("open");

1968

} else {

1969

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

1970

if(ret == -1){

1971

perror_plus("fstat");

1972

} else {

1973

if(S_ISREG(st.st_mode)

1974

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

1975

ret = fchown(seckey_fd, uid, gid);

1976

if(ret == -1){

1977

perror_plus("fchown");

1978

}

1979

}

1980

}

1981

TEMP_FAILURE_RETRY(close(seckey_fd));

1982

}

1983

}

1984

1985

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

1986

int pubkey_fd = open(pubkey, O_RDONLY);

1987

if(pubkey_fd == -1){

1988

perror_plus("open");

1989

} else {

1990

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

1991

if(ret == -1){

1992

perror_plus("fstat");

1993

} else {

1994

if(S_ISREG(st.st_mode)

1995

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

1996

ret = fchown(pubkey_fd, uid, gid);

1997

if(ret == -1){

1998

perror_plus("fchown");

1999

}

2000

}

2001

}

2002

TEMP_FAILURE_RETRY(close(pubkey_fd));

2003

}

2004

}

2005

2006

/* Lower privileges */

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

2012

}

2013

}

2014

2015

/* Remove empty interface names */

2016

{

2017

char *interface = NULL;

2018

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

2019

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

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

2022

fprintf_plus(stderr, "Not using nonexisting interface"

2023

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

2024

}

2025

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

2026

interface = NULL;

2027

}

2028

}

2029

}

2030

2031

/* Run network hooks */

2032

{

2033

2034

if(mc.interfaces != NULL){

2035

interfaces_hooks = malloc(mc.interfaces_size);

2036

if(interfaces_hooks == NULL){

2037

perror_plus("malloc");

2038

goto end;

2039

}

2040

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

2041

interfaces_hooks_size = mc.interfaces_size;

2042

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2043

(int)',');

2044

}

2045

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

2046

interfaces_hooks : "", delay)){

2047

goto end;

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

2048

1518

}

2049

1519

}

2050

1520

2051

1521

if(not debug){

2052

1522

avahi_set_log_function(empty_log);

2053

1523

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

2054

1549

2055

1550

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

2056

1551

from the signal handler */

2057

1552

/* Initialize the pseudo-RNG for Avahi */

2058

1553

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

2059

simple_poll = avahi_simple_poll_new();

2060

if(simple_poll == NULL){

2061

fprintf_plus(stderr,

2062

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

1554

mc.simple_poll = avahi_simple_poll_new();

1555

if(mc.simple_poll == NULL){

1556

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

2063

1557

exitcode = EX_UNAVAILABLE;

2064

1558

goto end;

2065

1559

}

2127

1621

}

2128

1622

}

2129

1623

2130

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

2131

if(mc.interfaces == NULL){

2132

struct dirent **direntries;

2133

/* Look for any good interfaces */

2134

ret = scandir(sys_class_net, &direntries, good_interface,

2135

alphasort);

2136

if(ret >= 1){

2137

/* Add all found interfaces to interfaces list */

2138

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

2139

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

2140

direntries[i]->d_name);

2141

if(ret_errno != 0){

2142

perror_plus("argz_add");

2143

continue;

2144

}

2145

if(debug){

2146

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

2147

direntries[i]->d_name);

2148

}

2149

}

2150

free(direntries);

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

1709

}

1710

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

break;

1729

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

2151

1760

} else {

2152

free(direntries);

2153

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

2154

exitcode = EXIT_FAILURE;

2155

goto end;

2156

}

2157

}

2158

2159

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

2160

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

2161

if(debug){

2162

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

2163

mc.interfaces);

2164

}

2165

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

2166

}

2167

2168

/* Bring up interfaces which are down */

2169

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

2170

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

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

bool interface_was_up = interface_is_up(interface);

2175

ret = bring_up_interface(interface, delay);

2176

if(not interface_was_up){

2177

if(ret != 0){

2178

errno = ret;

2179

perror_plus("Failed to bring up interface");

2180

} else {

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2184

}

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

2185

1765

}

2186

1766

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2190

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

2191

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

2192

}

2193

1767

}

2194

1768

2195

1769

if(quit_now){

2196

1770

goto end;

2197

1771

}

2198

1772

2199

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

1773

ret = init_gnutls_global(pubkey, seckey);

2200

1774

if(ret == -1){

2201

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

1775

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

2202

1776

exitcode = EX_UNAVAILABLE;

2203

1777

goto end;

2204

1778

} else {

2219

1793

goto end;

2220

1794

}

2221

1795

2222

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

2223

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

1796

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

1797

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

2224

1798

exitcode = EX_UNAVAILABLE;

2225

1799

goto end;

2226

1800

} else {

2235

1809

/* Connect directly, do not use Zeroconf */

2236

1810

/* (Mainly meant for debugging) */

2237

1811

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

2238

2239

1812

if(address == NULL){

2240

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

1813

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

2241

1814

exitcode = EX_USAGE;

2242

1815

goto end;

2243

1816

}

2246

1819

goto end;

2247

1820

}

2248

1821

2249

in_port_t port;

1822

uint16_t port;

2250

1823

errno = 0;

2251

1824

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

2252

1825

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

2253

or tmpmax != (in_port_t)tmpmax){

2254

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2255

1828

exitcode = EX_USAGE;

2256

1829

goto end;

2257

1830

}

2260

1833

goto end;

2261

1834

}

2262

1835

2263

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2264

1837

*address = '\0';

2265

1838

/* Colon in address indicates IPv6 */

2266

1839

int af;

2282

1855

}

2283

1856

2284

1857

while(not quit_now){

2285

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

2286

&mc);

1858

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

2287

1859

if(quit_now or ret == 0){

2288

1860

break;

2289

1861

}

2290

1862

if(debug){

2291

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

2292

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2293

1865

}

2294

1866

sleep((int)retry_interval);

2295

1867

}

2297

1869

if (not quit_now){

2298

1870

exitcode = EXIT_SUCCESS;

2299

1871

}

2300

1872

2301

1873

goto end;

2302

1874

}

2303

1875

2315

1887

config.publish_domain = 0;

2316

1888

2317

1889

/* Allocate a new server */

2318

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2319

&config, NULL, NULL, &ret_errno);

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2320

1893

2321

1894

/* Free the Avahi configuration data */

2322

1895

avahi_server_config_free(&config);

2324

1897

2325

1898

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

2326

1899

if(mc.server == NULL){

2327

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

2328

avahi_strerror(ret_errno));

1900

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

1901

avahi_strerror(error));

2329

1902

exitcode = EX_UNAVAILABLE;

2330

1903

goto end;

2331

1904

}

2337

1910

/* Create the Avahi service browser */

2338

1911

sb = avahi_s_service_browser_new(mc.server, if_index,

2339

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2340

NULL, 0, browse_callback,

2341

(void *)&mc);

1913

NULL, 0, browse_callback, NULL);

2342

1914

if(sb == NULL){

2343

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

2344

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2345

1917

exitcode = EX_UNAVAILABLE;

2346

1918

goto end;

2347

1919

}

2353

1925

/* Run the main loop */

2354

1926

2355

1927

if(debug){

2356

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

1928

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

2357

1929

}

2358

1930

2359

ret = avahi_loop_with_timeout(simple_poll,

2360

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

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2361

1933

if(debug){

2362

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

2363

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

1934

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

1935

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

2364

1936

}

2365

1937

2366

1938

end:

2367

1939

2368

1940

if(debug){

2369

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

1941

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

2370

1942

}

2371

1943

2372

1944

/* Cleanup things */

2376

1948

if(mc.server != NULL)

2377

1949

avahi_server_free(mc.server);

2378

1950

2379

if(simple_poll != NULL)

2380

avahi_simple_poll_free(simple_poll);

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2381

1953

2382

1954

if(gnutls_initialized){

2383

1955

gnutls_certificate_free_credentials(mc.cred);

2388

1960

if(gpgme_initialized){

2389

1961

gpgme_release(mc.ctx);

2390

1962

}

2391

1963

2392

1964

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

2393

1965

has seen */

2394

1966

if(mc.current_server != NULL){

2400

1972

}

2401

1973

}

2402

1974

2403

/* Re-raise priviliges */

2404

{

2405

raise_privileges();

2406

2407

/* Run network hooks */

2408

run_network_hooks("stop", interfaces_hooks != NULL ?

2409

interfaces_hooks : "", delay);

2410

2411

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

2412

{

2413

char *interface = NULL;

2414

while((interface=argz_next(interfaces_to_take_down,

2415

interfaces_to_take_down_size,

2416

interface))){

2417

ret_errno = take_down_interface(interface);

2418

if(ret_errno != 0){

2419

errno = ret_errno;

2420

perror_plus("Failed to take down interface");

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2421

1992

}

2422

1993

}

2423

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

2424

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

2425

" down\n");

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2426

2003

}

2427

2004

}

2428

2429

lower_privileges_permanently();

2430

2005

}

2431

2006

2432

free(interfaces_to_take_down);

2433

free(interfaces_hooks);

2434

2435

2007

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

2436

2008

if(tempdir_created){

2437

2009

struct dirent **direntries = NULL;

2450

2022

}

2451

2023

ret = remove(fullname);

2452

2024

if(ret == -1){

2453

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

2454

strerror(errno));

2025

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

2026

strerror(errno));

2455

2027

}

2456

2028

free(fullname);

2457

2029

}