/mandos/release : revision 237.7.149

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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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#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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#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() */

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

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

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

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

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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_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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uint16_t port;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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159

unsigned int dh_bits;

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server *current_server;

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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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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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

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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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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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bool add_server(const char *ip, in_port_t port, 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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perror_plus("malloc");

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return -1;

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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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.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 -1;

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

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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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perror_plus("clock_gettime");

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return -1;

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return false;

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}

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return 0;

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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){

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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(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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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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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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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){

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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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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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return false;

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}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

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

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

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tempdir);

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return false;

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}

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/* Create new GPGME "context" */

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strerror(rc));

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return false;

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}

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353

ssize_t plaintext_length = 0;

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if(debug){

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

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

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}

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

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

361

0);

341

362

if(rc != GPG_ERR_NO_ERROR){

342

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

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gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

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366

}

346

367

347

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

348

369

rc = gpgme_data_new(&dh_plain);

349

370

if(rc != GPG_ERR_NO_ERROR){

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

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374

gpgme_data_release(dh_crypto);

353

375

return -1;

354

376

}

357

379

data buffer */

358

380

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

359

381

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

362

384

plaintext_length = -1;

363

385

if(debug){

364

386

gpgme_decrypt_result_t result;

365

387

result = gpgme_op_decrypt_result(mc.ctx);

366

388

if(result == NULL){

367

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

389

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

368

390

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

373

395

if(result->file_name != NULL){

374

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

396

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

375

397

}

376

398

gpgme_recipient_t recipient;

377

399

recipient = result->recipients;

378

400

while(recipient != NULL){

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");

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");

385

408

recipient = recipient->next;

386

409

}

387

410

}

390

413

}

391

414

392

415

if(debug){

393

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

416

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

394

417

}

395

418

396

419

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

403

426

*plaintext = NULL;

404

427

while(true){

405

428

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

408

431

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

412

435

}

413

436

414

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

450

}

428

451

429

452

if(debug){

430

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

453

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

431

454

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

432

455

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

433

456

}

445

468

}

446

469

447

470

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

450

472

if(ret == NULL)

451

473

ret = "(unknown)";

452

474

return ret;

455

477

/* GnuTLS log function callback */

456

478

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

457

479

const char* string){

458

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

480

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

459

481

}

460

482

461

483

static int init_gnutls_global(const char *pubkeyfilename,

463

485

int ret;

464

486

465

487

if(debug){

466

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

488

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

467

489

}

468

490

469

491

ret = gnutls_global_init();

470

492

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

473

495

return -1;

474

496

}

475

497

484

506

/* OpenPGP credentials */

485

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

508

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

509

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

510

safer_gnutls_strerror(ret));

489

511

gnutls_global_deinit();

490

512

return -1;

491

513

}

492

514

493

515

if(debug){

494

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

495

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

496

seckeyfilename);

516

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

517

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

518

pubkeyfilename,

519

seckeyfilename);

497

520

}

498

521

499

522

ret = gnutls_certificate_set_openpgp_key_file

500

523

(mc.cred, pubkeyfilename, seckeyfilename,

501

524

GNUTLS_OPENPGP_FMT_BASE64);

502

525

if(ret != GNUTLS_E_SUCCESS){

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));

526

fprintf_plus(stderr,

527

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

528

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

529

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

530

safer_gnutls_strerror(ret));

508

531

goto globalfail;

509

532

}

510

533

511

534

/* GnuTLS server initialization */

512

535

ret = gnutls_dh_params_init(&mc.dh_params);

513

536

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

516

540

goto globalfail;

517

541

}

518

542

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

519

543

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

544

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

545

safer_gnutls_strerror(ret));

522

546

goto globalfail;

523

547

}

524

548

544

568

}

545

569

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

546

570

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

549

574

}

550

575

551

576

{

558

583

}

559

584

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

560

585

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

safer_gnutls_strerror(ret));

586

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

587

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

588

safer_gnutls_strerror(ret));

564

589

gnutls_deinit(*session);

565

590

return -1;

566

591

}

575

600

}

576

601

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

577

602

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

603

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

604

safer_gnutls_strerror(ret));

580

605

gnutls_deinit(*session);

581

606

return -1;

582

607

}

594

619

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

595

620

596

621

/* Called when a Mandos server is found */

597

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

622

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

598

623

AvahiIfIndex if_index,

599

624

int af){

600

625

int ret, tcp_sd = -1;

627

652

pf = PF_INET;

628

653

break;

629

654

default:

630

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

655

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

631

656

errno = EINVAL;

632

657

return -1;

633

658

}

638

663

}

639

664

640

665

if(debug){

641

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

642

"\n", ip, port);

666

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

667

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

643

668

}

644

669

645

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

671

696

}

672

697

if(ret == 0){

673

698

int e = errno;

674

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

699

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

675

700

errno = e;

676

701

goto mandos_end;

677

702

}

678

703

if(af == AF_INET6){

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

704

to.in6.sin6_port = htons(port);

683

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

706

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

685

-Wunreachable-code*/

707

-Wunreachable-code*/

686

708

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

709

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

710

" incomplete without a network interface\n");

689

711

errno = EINVAL;

690

712

goto mandos_end;

691

713

}

709

731

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

710

732

perror_plus("if_indextoname");

711

733

} else {

712

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

713

ip, interface, port);

734

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

735

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

714

736

}

715

737

} else {

716

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

717

port);

738

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

739

ip, (uintmax_t)port);

718

740

}

719

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

742

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

752

perror_plus("inet_ntop");

731

753

} else {

732

754

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

733

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

755

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

734

756

}

735

757

}

736

758

}

764

786

while(true){

765

787

size_t out_size = strlen(out);

766

788

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

767

out_size - written));

789

out_size - written));

768

790

if(ret == -1){

769

791

int e = errno;

770

792

perror_plus("write");

790

812

}

791

813

792

814

if(debug){

793

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

815

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

794

816

}

795

817

796

818

if(quit_now){

798

820

goto mandos_end;

799

821

}

800

822

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

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

824

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

825

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

826

gnutls_transport_set_ptr(session,

827

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

803

828

804

829

if(quit_now){

805

830

errno = EINTR;

816

841

817

842

if(ret != GNUTLS_E_SUCCESS){

818

843

if(debug){

819

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

844

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

820

845

gnutls_perror(ret);

821

846

}

822

847

errno = EPROTO;

826

851

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

827

852

828

853

if(debug){

829

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

830

ip);

854

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

855

" %s\n", ip);

831

856

}

832

857

833

858

while(true){

838

863

}

839

864

840

865

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

866

buffer_capacity);

842

867

if(buffer_capacity == 0){

843

868

int e = errno;

844

869

perror_plus("incbuffer");

871

896

}

872

897

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

873

898

if(ret < 0){

874

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

899

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

900

"***\n");

875

901

gnutls_perror(ret);

876

902

errno = EPROTO;

877

903

goto mandos_end;

878

904

}

879

905

break;

880

906

default:

881

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

882

" encrypted session with Mandos server\n");

907

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

908

" encrypted session with Mandos server\n");

883

909

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

910

errno = EIO;

885

911

goto mandos_end;

890

916

}

891

917

892

918

if(debug){

893

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

919

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

894

920

}

895

921

896

922

if(quit_now){

908

934

909

935

if(buffer_length > 0){

910

936

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

937

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

913

938

&decrypted_buffer);

914

939

if(decrypted_buffer_size >= 0){

915

940

926

951

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

927

952

int e = errno;

928

953

if(debug){

929

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

930

strerror(errno));

954

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

955

strerror(errno));

931

956

}

932

957

errno = e;

933

958

goto mandos_end;

978

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

979

1004

flags,

980

1005

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1006

if(r == NULL){

1007

return;

1008

}

982

1009

983

1010

/* Called whenever a service has been resolved successfully or

984

1011

timed out */

990

1017

switch(event){

991

1018

default:

992

1019

case AVAHI_RESOLVER_FAILURE:

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)));

1020

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

1021

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

1022

domain,

1023

avahi_strerror(avahi_server_errno(mc.server)));

996

1024

break;

997

1025

998

1026

case AVAHI_RESOLVER_FOUND:

1000

1028

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1029

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

1002

1030

if(debug){

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);

1031

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

1032

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

1033

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

1006

1034

}

1007

int ret = start_mandos_communication(ip, port, interface,

1035

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

1036

interface,

1008

1037

avahi_proto_to_af(proto));

1009

1038

if(ret == 0){

1010

avahi_simple_poll_quit(mc.simple_poll);

1039

avahi_simple_poll_quit(simple_poll);

1011

1040

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1041

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

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1045

}

1014

1046

}

1015

1047

}

1016

1048

}

1027

1059

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1028

1060

flags,

1029

1061

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1062

if(b == NULL){

1063

return;

1064

}

1031

1065

1032

1066

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

1033

1067

is removed from the LAN */

1040

1074

default:

1041

1075

case AVAHI_BROWSER_FAILURE:

1042

1076

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1077

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

1078

avahi_strerror(avahi_server_errno(mc.server)));

1079

avahi_simple_poll_quit(simple_poll);

1046

1080

return;

1047

1081

1048

1082

case AVAHI_BROWSER_NEW:

1054

1088

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

1055

1089

name, type, domain, protocol, 0,

1056

1090

resolve_callback, NULL) == NULL)

1057

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

1058

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

1091

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

1092

" %s\n", name,

1093

avahi_strerror(avahi_server_errno(mc.server)));

1059

1094

break;

1060

1095

1061

1096

case AVAHI_BROWSER_REMOVE:

1064

1099

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1100

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1101

if(debug){

1067

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

1102

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

1103

" searching...\n");

1068

1104

}

1069

1105

break;

1070

1106

}

1079

1115

signal_received = sig;

1080

1116

int old_errno = errno;

1081

1117

/* set main loop to exit */

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1118

if(simple_poll != NULL){

1119

avahi_simple_poll_quit(simple_poll);

1084

1120

}

1085

1121

errno = old_errno;

1086

1122

}

1087

1123

1124

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

1125

int ret;

1126

error_t ret_errno;

1127

1128

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

1129

if(s < 0){

1130

ret_errno = errno;

1131

perror_plus("socket");

1132

errno = ret_errno;

1133

return false;

1134

}

1135

strcpy(ifr->ifr_name, ifname);

1136

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1137

if(ret == -1){

1138

if(debug){

1139

ret_errno = errno;

1140

perror_plus("ioctl SIOCGIFFLAGS");

1141

errno = ret_errno;

1142

}

1143

return false;

1144

}

1145

return true;

1146

}

1147

1148

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

1149

1150

/* Reject the loopback device */

1151

if(ifr->ifr_flags & IFF_LOOPBACK){

1152

if(debug){

1153

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

1154

ifname);

1155

}

1156

return false;

1157

}

1158

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

1159

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

1160

if(debug){

1161

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

1162

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

1163

}

1164

return true;

1165

}

1166

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

1167

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

1168

if(debug){

1169

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1170

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

1171

}

1172

return false;

1173

}

1174

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

1175

if(ifr->ifr_flags & IFF_NOARP){

1176

if(debug){

1177

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

1178

ifname);

1179

}

1180

return false;

1181

}

1182

1183

/* Accept this device */

1184

if(debug){

1185

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

1186

}

1187

return true;

1188

}

1189

1088

1190

/*

1089

1191

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

1090

1192

* corresponds to an acceptable network device.

1091

1193

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

1092

1194

*/

1093

1195

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

1196

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

1097

1197

return 0;

1098

1198

}

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){

1144

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1155

if(debug){

1156

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

1157

if_entry->d_name);

1158

}

1159

return 0;

1160

}

1161

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

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 1;

1168

}

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1171

if(debug){

1172

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

1173

if_entry->d_name);

1174

}

1175

return 0;

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

if_entry->d_name);

1199

1200

struct ifreq ifr;

1201

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

1202

if(debug){

1203

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

1204

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

1205

}

1206

return 0;

1207

}

1208

1209

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

1210

return 0;

1189

1211

}

1190

1212

return 1;

1191

1213

}

1192

1214

1215

/*

1216

* This function determines if a network interface is up.

1217

*/

1218

bool interface_is_up(const char *interface){

1219

struct ifreq ifr;

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return false;

1226

}

1227

1228

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

1229

}

1230

1231

/*

1232

* This function determines if a network interface is running

1233

*/

1234

bool interface_is_running(const char *interface){

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

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

1240

}

1241

return false;

1242

}

1243

1244

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

1245

}

1246

1193

1247

int notdotentries(const struct dirent *direntry){

1194

1248

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

1195

1249

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

1201

1255

return 1;

1202

1256

}

1203

1257

1258

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

1259

int runnable_hook(const struct dirent *direntry){

1260

int ret;

1261

size_t sret;

1262

struct stat st;

1263

1264

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

1265

/* Empty name? */

1266

return 0;

1267

}

1268

1269

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

1270

"abcdefghijklmnopqrstuvwxyz"

1271

"0123456789"

1272

"_-");

1273

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

1274

/* Contains non-allowed characters */

1275

if(debug){

1276

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

1277

direntry->d_name);

1278

}

1279

return 0;

1280

}

1281

1282

char *fullname = NULL;

1283

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

1284

if(ret < 0){

1285

perror_plus("asprintf");

1286

return 0;

1287

}

1288

1289

ret = stat(fullname, &st);

1290

if(ret == -1){

1291

if(debug){

1292

perror_plus("Could not stat hook");

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not a regular file */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

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

1305

/* Not executable */

1306

if(debug){

1307

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

1308

direntry->d_name);

1309

}

1310

return 0;

1311

}

1312

if(debug){

1313

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

1314

direntry->d_name);

1315

}

1316

return 1;

1317

}

1318

1204

1319

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1320

int ret;

1206

1321

struct timespec now;

1210

1325

while(true){

1211

1326

if(mc.current_server == NULL){

1212

1327

if (debug){

1213

fprintf(stderr,

1214

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

1328

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

1329

" No timeout!\n");

1215

1330

}

1216

1331

ret = avahi_simple_poll_iterate(s, -1);

1217

1332

} else {

1218

1333

if (debug){

1219

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

1220

" or wait\n");

1334

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

1335

" it, or wait\n");

1221

1336

}

1222

1337

/* the current time */

1223

1338

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1239

1354

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

1240

1355

1241

1356

if (debug){

1242

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

1357

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

1358

block_time);

1243

1359

}

1244

1360

1245

1361

if(block_time <= 0){

1248

1364

mc.current_server->if_index,

1249

1365

mc.current_server->af);

1250

1366

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1367

avahi_simple_poll_quit(simple_poll);

1252

1368

return 0;

1253

1369

}

1254

1370

ret = clock_gettime(CLOCK_MONOTONIC,

1265

1381

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

1266

1382

}

1267

1383

if(ret != 0){

1268

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

1384

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

1269

1385

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

1270

1386

}

1271

1387

}

1272

1388

}

1273

1389

}

1274

1390

1391

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

1392

error_t raise_privileges(void){

1393

error_t old_errno = errno;

1394

error_t ret_errno = 0;

1395

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

1396

ret_errno = errno;

1397

perror_plus("seteuid");

1398

}

1399

errno = old_errno;

1400

return ret_errno;

1401

}

1402

1403

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

1404

error_t raise_privileges_permanently(void){

1405

error_t old_errno = errno;

1406

error_t ret_errno = raise_privileges();

1407

if(ret_errno != 0){

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

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

1412

ret_errno = errno;

1413

perror_plus("seteuid");

1414

}

1415

errno = old_errno;

1416

return ret_errno;

1417

}

1418

1419

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

1420

error_t lower_privileges(void){

1421

error_t old_errno = errno;

1422

error_t ret_errno = 0;

1423

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

1424

ret_errno = errno;

1425

perror_plus("seteuid");

1426

}

1427

errno = old_errno;

1428

return ret_errno;

1429

}

1430

1431

/* Lower privileges permanently */

1432

error_t lower_privileges_permanently(void){

1433

error_t old_errno = errno;

1434

error_t ret_errno = 0;

1435

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

1436

ret_errno = errno;

1437

perror_plus("setuid");

1438

}

1439

errno = old_errno;

1440

return ret_errno;

1441

}

1442

1443

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

1444

const float delay){

1445

struct dirent **direntries;

1446

struct dirent *direntry;

1447

int ret;

1448

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

1449

alphasort);

1450

if(numhooks == -1){

1451

if(errno == ENOENT){

1452

if(debug){

1453

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

1454

" found\n", hookdir);

1455

}

1456

} else {

1457

perror_plus("scandir");

1458

}

1459

} else {

1460

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

1461

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

1462

direntry = direntries[i];

1463

char *fullname = NULL;

1464

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

1465

if(ret < 0){

1466

perror_plus("asprintf");

1467

continue;

1468

}

1469

if(debug){

1470

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

1471

direntry->d_name);

1472

}

1473

pid_t hook_pid = fork();

1474

if(hook_pid == 0){

1475

/* Child */

1476

/* Raise privileges */

1477

raise_privileges_permanently();

1478

/* Set group */

1479

errno = 0;

1480

ret = setgid(0);

1481

if(ret == -1){

1482

perror_plus("setgid");

1483

}

1484

/* Reset supplementary groups */

1485

errno = 0;

1486

ret = setgroups(0, NULL);

1487

if(ret == -1){

1488

perror_plus("setgroups");

1489

}

1490

dup2(devnull, STDIN_FILENO);

1491

close(devnull);

1492

dup2(STDERR_FILENO, STDOUT_FILENO);

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

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

1509

if(ret == -1){

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1513

char *delaystring;

1514

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

1515

if(ret == -1){

1516

perror_plus("asprintf");

1517

_exit(EX_OSERR);

1518

}

1519

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

1520

if(ret == -1){

1521

free(delaystring);

1522

perror_plus("setenv");

1523

_exit(EX_OSERR);

1524

}

1525

free(delaystring);

1526

if(connect_to != NULL){

1527

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

1528

if(ret == -1){

1529

perror_plus("setenv");

1530

_exit(EX_OSERR);

1531

}

1532

}

1533

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

1534

perror_plus("execl");

1535

_exit(EXIT_FAILURE);

1536

}

1537

} else {

1538

int status;

1539

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

1540

perror_plus("waitpid");

1541

free(fullname);

1542

continue;

1543

}

1544

if(WIFEXITED(status)){

1545

if(WEXITSTATUS(status) != 0){

1546

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

1547

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

1548

WEXITSTATUS(status));

1549

free(fullname);

1550

continue;

1551

}

1552

} else if(WIFSIGNALED(status)){

1553

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

1554

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

1555

WTERMSIG(status));

1556

free(fullname);

1557

continue;

1558

} else {

1559

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

1560

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

1561

free(fullname);

1562

continue;

1563

}

1564

}

1565

free(fullname);

1566

if(debug){

1567

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

1568

direntry->d_name);

1569

}

1570

}

1571

close(devnull);

1572

}

1573

return true;

1574

}

1575

1576

error_t bring_up_interface(const char *const interface,

1577

const float delay){

1578

int sd = -1;

1579

error_t old_errno = errno;

1580

error_t ret_errno = 0;

1581

int ret, ret_setflags;

1582

struct ifreq network;

1583

unsigned int if_index = if_nametoindex(interface);

1584

if(if_index == 0){

1585

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

1586

errno = old_errno;

1587

return ENXIO;

1588

}

1589

1590

if(quit_now){

1591

errno = old_errno;

1592

return EINTR;

1593

}

1594

1595

if(not interface_is_up(interface)){

1596

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

1597

ret_errno = errno;

1598

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

1599

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

1600

return ret_errno;

1601

}

1602

network.ifr_flags |= IFF_UP;

1603

1604

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1605

if(sd < 0){

1606

ret_errno = errno;

1607

perror_plus("socket");

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

if(quit_now){

1613

close(sd);

1614

errno = old_errno;

1615

return EINTR;

1616

}

1617

1618

if(debug){

1619

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

1620

interface);

1621

}

1622

1623

/* Raise priviliges */

1624

raise_privileges();

1625

1626

#ifdef __linux__

1627

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1628

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

1629

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

1630

bool restore_loglevel = true;

1631

if(ret_linux == -1){

1632

restore_loglevel = false;

1633

perror_plus("klogctl");

1634

}

1635

#endif /* __linux__ */

1636

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

1637

ret_errno = errno;

1638

#ifdef __linux__

1639

if(restore_loglevel){

1640

ret_linux = klogctl(7, NULL, 0);

1641

if(ret_linux == -1){

1642

perror_plus("klogctl");

1643

}

1644

}

1645

#endif /* __linux__ */

1646

1647

/* Lower privileges */

1648

lower_privileges();

1649

1650

/* Close the socket */

1651

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

1652

if(ret == -1){

1653

perror_plus("close");

1654

}

1655

1656

if(ret_setflags == -1){

1657

errno = ret_errno;

1658

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1659

errno = old_errno;

1660

return ret_errno;

1661

}

1662

} else if(debug){

1663

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

1664

interface);

1665

}

1666

1667

/* Sleep checking until interface is running.

1668

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

1669

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

1670

if(interface_is_running(interface)){

1671

break;

1672

}

1673

struct timespec sleeptime = { .tv_nsec = 250000000 };

1674

ret = nanosleep(&sleeptime, NULL);

1675

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

1676

perror_plus("nanosleep");

1677

}

1678

}

1679

1680

errno = old_errno;

1681

return 0;

1682

}

1683

1684

error_t take_down_interface(const char *const interface){

1685

int sd = -1;

1686

error_t old_errno = errno;

1687

error_t ret_errno = 0;

1688

int ret, ret_setflags;

1689

struct ifreq network;

1690

unsigned int if_index = if_nametoindex(interface);

1691

if(if_index == 0){

1692

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

1693

errno = old_errno;

1694

return ENXIO;

1695

}

1696

if(interface_is_up(interface)){

1697

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

1698

ret_errno = errno;

1699

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

1700

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

1701

return ret_errno;

1702

}

1703

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

1704

1705

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1706

if(sd < 0){

1707

ret_errno = errno;

1708

perror_plus("socket");

1709

errno = old_errno;

1710

return ret_errno;

1711

}

1712

1713

if(debug){

1714

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

1715

interface);

1716

}

1717

1718

/* Raise priviliges */

1719

raise_privileges();

1720

1721

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

1722

ret_errno = errno;

1723

1724

/* Lower privileges */

1725

lower_privileges();

1726

1727

/* Close the socket */

1728

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

1729

if(ret == -1){

1730

perror_plus("close");

1731

}

1732

1733

if(ret_setflags == -1){

1734

errno = ret_errno;

1735

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1736

errno = old_errno;

1737

return ret_errno;

1738

}

1739

} else if(debug){

1740

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

1741

interface);

1742

}

1743

1744

errno = old_errno;

1745

return 0;

1746

}

1747

1275

1748

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

1276

1749

AvahiSServiceBrowser *sb = NULL;

1277

int error;

1750

error_t ret_errno;

1278

1751

int ret;

1279

1752

intmax_t tmpmax;

1280

1753

char *tmp;

1281

1754

int exitcode = EXIT_SUCCESS;

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;

1755

char *interfaces = NULL;

1756

size_t interfaces_size = 0;

1757

char *interfaces_to_take_down = NULL;

1758

size_t interfaces_to_take_down_size = 0;

1288

1759

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

1289

1760

bool tempdir_created = false;

1290

1761

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1291

1762

const char *seckey = PATHDIR "/" SECKEY;

1292

1763

const char *pubkey = PATHDIR "/" PUBKEY;

1764

char *interfaces_hooks = NULL;

1765

size_t interfaces_hooks_size = 0;

1293

1766

1294

1767

bool gnutls_initialized = false;

1295

1768

bool gpgme_initialized = false;

1357

1830

.group = 2 },

1358

1831

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

1359

1832

.arg = "SECONDS",

1360

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

1833

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

1834

.group = 2 },

1835

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

1836

.arg = "DIR",

1837

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

1361

1838

.group = 2 },

1362

1839

/*

1363

1840

* These reproduce what we would get without ARGP_NO_HELP

1382

1859

connect_to = arg;

1383

1860

break;

1384

1861

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

1385

interface = arg;

1862

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

1863

(int)',');

1864

if(ret_errno != 0){

1865

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

1866

}

1386

1867

break;

1387

1868

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

1388

1869

seckey = arg;

1417

1898

argp_error(state, "Bad retry interval");

1418

1899

}

1419

1900

break;

1901

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

1902

hookdir = arg;

1903

break;

1420

1904

/*

1421

1905

* These reproduce what we would get without ARGP_NO_HELP

1422

1906

*/

1428

1912

argp_state_help(state, state->out_stream,

1429

1913

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1914

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

1431

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

1915

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

1432

1916

exit(argp_err_exit_status);

1433

1917

break;

1434

1918

default:

1461

1945

{

1462

1946

/* Work around Debian bug #633582:

1463

1947

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

1464

struct stat st;

1465

1948

1466

1949

/* Re-raise priviliges */

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");

1950

if(raise_privileges() == 0){

1951

struct stat st;

1952

1953

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

1954

int seckey_fd = open(seckey, O_RDONLY);

1955

if(seckey_fd == -1){

1956

perror_plus("open");

1957

} else {

1958

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

1959

if(ret == -1){

1960

perror_plus("fstat");

1961

} else {

1962

if(S_ISREG(st.st_mode)

1963

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

1964

ret = fchown(seckey_fd, uid, gid);

1965

if(ret == -1){

1966

perror_plus("fchown");

1967

}

1968

}

1969

}

1970

TEMP_FAILURE_RETRY(close(seckey_fd));

1971

}

1972

}

1973

1974

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

1975

int pubkey_fd = open(pubkey, O_RDONLY);

1976

if(pubkey_fd == -1){

1977

perror_plus("open");

1978

} else {

1979

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

1980

if(ret == -1){

1981

perror_plus("fstat");

1982

} else {

1983

if(S_ISREG(st.st_mode)

1984

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

1985

ret = fchown(pubkey_fd, uid, gid);

1986

if(ret == -1){

1987

perror_plus("fchown");

1988

}

1989

}

1990

}

1991

TEMP_FAILURE_RETRY(close(pubkey_fd));

1992

}

1993

}

1994

1995

/* Lower privileges */

1996

errno = 0;

1997

ret = seteuid(uid);

1998

if(ret == -1){

1999

perror_plus("seteuid");

2000

}

2001

}

2002

}

2003

2004

/* Remove empty interface names */

2005

{

2006

char *interface = NULL;

2007

while((interface = argz_next(interfaces, interfaces_size,

2008

interface))){

2009

if(if_nametoindex(interface) == 0){

2010

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

2011

fprintf_plus(stderr, "Not using nonexisting interface"

2012

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

2013

}

2014

argz_delete(&interfaces, &interfaces_size, interface);

2015

interface = NULL;

2016

}

2017

}

2018

}

2019

2020

/* Run network hooks */

2021

{

2022

2023

if(interfaces != NULL){

2024

interfaces_hooks = malloc(interfaces_size);

2025

if(interfaces_hooks == NULL){

2026

perror_plus("malloc");

2027

goto end;

2028

}

2029

memcpy(interfaces_hooks, interfaces, interfaces_size);

2030

interfaces_hooks_size = interfaces_size;

2031

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2032

(int)',');

2033

}

2034

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

2035

interfaces_hooks : "", delay)){

2036

goto end;

1518

2037

}

1519

2038

}

1520

2039

1521

2040

if(not debug){

1522

2041

avahi_set_log_function(empty_log);

1523

2042

}

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

}

1549

2043

1550

2044

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

1551

2045

from the signal handler */

1552

2046

/* Initialize the pseudo-RNG for Avahi */

1553

2047

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

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");

2048

simple_poll = avahi_simple_poll_new();

2049

if(simple_poll == NULL){

2050

fprintf_plus(stderr,

2051

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

1557

2052

exitcode = EX_UNAVAILABLE;

1558

2053

goto end;

1559

2054

}

1621

2116

}

1622

2117

}

1623

2118

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

}

2119

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

2120

if(interfaces == NULL){

2121

struct dirent **direntries;

2122

/* Look for any good interfaces */

2123

ret = scandir(sys_class_net, &direntries, good_interface,

2124

alphasort);

2125

if(ret >= 1){

2126

/* Add all found interfaces to interfaces list */

2127

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

2128

ret_errno = argz_add(&interfaces, &interfaces_size,

2129

direntries[i]->d_name);

2130

if(ret_errno != 0){

2131

perror_plus("argz_add");

2132

continue;

2133

}

2134

if(debug){

2135

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

2136

direntries[i]->d_name);

2137

}

2138

}

2139

free(direntries);

1760

2140

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

2141

free(direntries);

2142

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

2143

exitcode = EXIT_FAILURE;

2144

goto end;

2145

}

2146

}

2147

2148

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

2149

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

2150

if(debug){

2151

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

2152

interfaces);

2153

}

2154

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2155

}

2156

2157

/* Bring up interfaces which are down */

2158

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

2159

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

2160

char *interface = NULL;

2161

while((interface = argz_next(interfaces, interfaces_size,

2162

interface))){

2163

bool interface_was_up = interface_is_up(interface);

2164

ret = bring_up_interface(interface, delay);

2165

if(not interface_was_up){

2166

if(ret != 0){

2167

errno = ret;

2168

perror_plus("Failed to bring up interface");

2169

} else {

2170

ret_errno = argz_add(&interfaces_to_take_down,

2171

&interfaces_to_take_down_size,

2172

interface);

2173

}

1765

2174

}

1766

2175

}

2176

free(interfaces);

2177

interfaces = NULL;

2178

interfaces_size = 0;

2179

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

2180

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

2181

}

1767

2182

}

1768

2183

1769

2184

if(quit_now){

1772

2187

1773

2188

ret = init_gnutls_global(pubkey, seckey);

1774

2189

if(ret == -1){

1775

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

2190

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

1776

2191

exitcode = EX_UNAVAILABLE;

1777

2192

goto end;

1778

2193

} else {

1794

2209

}

1795

2210

1796

2211

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

1797

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

2212

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

1798

2213

exitcode = EX_UNAVAILABLE;

1799

2214

goto end;

1800

2215

} else {

1809

2224

/* Connect directly, do not use Zeroconf */

1810

2225

/* (Mainly meant for debugging) */

1811

2226

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

2227

1812

2228

if(address == NULL){

1813

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

2229

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

1814

2230

exitcode = EX_USAGE;

1815

2231

goto end;

1816

2232

}

1819

2235

goto end;

1820

2236

}

1821

2237

1822

uint16_t port;

2238

in_port_t port;

1823

2239

errno = 0;

1824

2240

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

1825

2241

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2242

or tmpmax != (in_port_t)tmpmax){

2243

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

1828

2244

exitcode = EX_USAGE;

1829

2245

goto end;

1830

2246

}

1833

2249

goto end;

1834

2250

}

1835

2251

1836

port = (uint16_t)tmpmax;

2252

port = (in_port_t)tmpmax;

1837

2253

*address = '\0';

1838

2254

/* Colon in address indicates IPv6 */

1839

2255

int af;

1860

2276

break;

1861

2277

}

1862

2278

if(debug){

1863

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

1864

(int)retry_interval);

2279

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

2280

(int)retry_interval);

1865

2281

}

1866

2282

sleep((int)retry_interval);

1867

2283

}

1869

2285

if (not quit_now){

1870

2286

exitcode = EXIT_SUCCESS;

1871

2287

}

1872

2288

1873

2289

goto end;

1874

2290

}

1875

2291

1887

2303

config.publish_domain = 0;

1888

2304

1889

2305

/* Allocate a new server */

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2306

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2307

&config, NULL, NULL, &ret_errno);

1893

2308

1894

2309

/* Free the Avahi configuration data */

1895

2310

avahi_server_config_free(&config);

1897

2312

1898

2313

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

1899

2314

if(mc.server == NULL){

1900

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

1901

avahi_strerror(error));

2315

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

2316

avahi_strerror(ret_errno));

1902

2317

exitcode = EX_UNAVAILABLE;

1903

2318

goto end;

1904

2319

}

1912

2327

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2328

NULL, 0, browse_callback, NULL);

1914

2329

if(sb == NULL){

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2330

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

2331

avahi_strerror(avahi_server_errno(mc.server)));

1917

2332

exitcode = EX_UNAVAILABLE;

1918

2333

goto end;

1919

2334

}

1925

2340

/* Run the main loop */

1926

2341

1927

2342

if(debug){

1928

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

2343

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

1929

2344

}

1930

2345

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2346

ret = avahi_loop_with_timeout(simple_poll,

1932

2347

(int)(retry_interval * 1000));

1933

2348

if(debug){

1934

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

1935

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

2349

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

2350

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

1936

2351

}

1937

2352

1938

2353

end:

1939

2354

1940

2355

if(debug){

1941

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

2356

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

1942

2357

}

1943

2358

1944

2359

/* Cleanup things */

1948

2363

if(mc.server != NULL)

1949

2364

avahi_server_free(mc.server);

1950

2365

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2366

if(simple_poll != NULL)

2367

avahi_simple_poll_free(simple_poll);

1953

2368

1954

2369

if(gnutls_initialized){

1955

2370

gnutls_certificate_free_credentials(mc.cred);

1960

2375

if(gpgme_initialized){

1961

2376

gpgme_release(mc.ctx);

1962

2377

}

1963

2378

1964

2379

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

1965

2380

has seen */

1966

2381

if(mc.current_server != NULL){

1972

2387

}

1973

2388

}

1974

2389

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");

2390

/* Re-raise priviliges */

2391

{

2392

raise_privileges();

2393

2394

/* Run network hooks */

2395

run_network_hooks("stop", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

2397

2398

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

2399

{

2400

char *interface = NULL;

2401

while((interface=argz_next(interfaces_to_take_down,

2402

interfaces_to_take_down_size,

2403

interface))){

2404

ret_errno = take_down_interface(interface);

2405

if(ret_errno != 0){

2406

errno = ret_errno;

2407

perror_plus("Failed to take down interface");

1992

2408

}

1993

2409

}

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");

2410

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

2411

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

2412

" down\n");

2003

2413

}

2004

2414

}

2415

2416

lower_privileges_permanently();

2005

2417

}

2006

2418

2419

free(interfaces_to_take_down);

2420

free(interfaces_hooks);

2421

2007

2422

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

2008

2423

if(tempdir_created){

2009

2424

struct dirent **direntries = NULL;

2022

2437

}

2023

2438

ret = remove(fullname);

2024

2439

if(ret == -1){

2025

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

2026

strerror(errno));

2440

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

2441

strerror(errno));

2027

2442

}

2028

2443

free(fullname);

2029

2444

}