/mandos/trunk : revision 505.1.12

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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, 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_bug_address = "<mandos@recompile.se>";

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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

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if(buffer == NULL){

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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

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int af, server **current_server){

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int 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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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 */

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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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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){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

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

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tempdir);

302

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

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return false;

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}

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/* Create new GPGME "context" */

331

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

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

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if(rc != GPG_ERR_NO_ERROR){

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

337

312

}

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313

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*/

350

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

351

326

size_t crypto_size,

352

char **plaintext,

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mandos_context *mc){

327

char **plaintext){

354

328

gpgme_data_t dh_crypto, dh_plain;

355

329

gpgme_error_t rc;

356

330

ssize_t ret;

358

332

ssize_t plaintext_length = 0;

359

333

360

334

if(debug){

361

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

335

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

362

336

}

363

337

364

338

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

365

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

366

340

0);

367

341

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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));

370

344

return -1;

371

345

}

372

346

373

347

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

374

348

rc = gpgme_data_new(&dh_plain);

375

349

if(rc != GPG_ERR_NO_ERROR){

376

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

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

379

352

gpgme_data_release(dh_crypto);

380

353

return -1;

381

354

}

382

355

383

356

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

384

357

data buffer */

385

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

358

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

386

359

if(rc != GPG_ERR_NO_ERROR){

387

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

388

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

389

362

plaintext_length = -1;

390

363

if(debug){

391

364

gpgme_decrypt_result_t result;

392

result = gpgme_op_decrypt_result(mc->ctx);

365

result = gpgme_op_decrypt_result(mc.ctx);

393

366

if(result == NULL){

394

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

367

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

395

368

} else {

396

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

397

result->unsupported_algorithm);

398

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

399

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);

400

373

if(result->file_name != NULL){

401

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

374

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

402

375

}

403

376

gpgme_recipient_t recipient;

404

377

recipient = result->recipients;

405

378

while(recipient != NULL){

406

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

407

gpgme_pubkey_algo_name

408

(recipient->pubkey_algo));

409

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

410

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

411

recipient->status == GPG_ERR_NO_SECKEY

412

? "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");

413

385

recipient = recipient->next;

414

386

}

415

387

}

418

390

}

419

391

420

392

if(debug){

421

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

393

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

422

394

}

423

395

424

396

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

431

403

*plaintext = NULL;

432

404

while(true){

433

405

plaintext_capacity = incbuffer(plaintext,

434

(size_t)plaintext_length,

435

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

436

408

if(plaintext_capacity == 0){

437

perror_plus("incbuffer");

438

plaintext_length = -1;

439

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

440

412

}

441

413

442

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

455

427

}

456

428

457

429

if(debug){

458

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

430

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

459

431

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

460

432

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

461

433

}

473

445

}

474

446

475

447

static const char * safer_gnutls_strerror(int value){

476

const char *ret = gnutls_strerror(value);

448

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

449

-Wunreachable-code */

477

450

if(ret == NULL)

478

451

ret = "(unknown)";

479

452

return ret;

482

455

/* GnuTLS log function callback */

483

456

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

484

457

const char* string){

485

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

458

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

486

459

}

487

460

488

461

static int init_gnutls_global(const char *pubkeyfilename,

489

const char *seckeyfilename,

490

mandos_context *mc){

462

const char *seckeyfilename){

491

463

int ret;

492

464

493

465

if(debug){

494

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

466

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

495

467

}

496

468

497

469

ret = gnutls_global_init();

498

470

if(ret != GNUTLS_E_SUCCESS){

499

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

500

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

501

473

return -1;

502

474

}

503

475

510

482

}

511

483

512

484

/* OpenPGP credentials */

513

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

514

486

if(ret != GNUTLS_E_SUCCESS){

515

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

516

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

517

489

gnutls_global_deinit();

518

490

return -1;

519

491

}

520

492

521

493

if(debug){

522

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

523

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

524

pubkeyfilename,

525

seckeyfilename);

494

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

495

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

496

seckeyfilename);

526

497

}

527

498

528

499

ret = gnutls_certificate_set_openpgp_key_file

529

(mc->cred, pubkeyfilename, seckeyfilename,

500

(mc.cred, pubkeyfilename, seckeyfilename,

530

501

GNUTLS_OPENPGP_FMT_BASE64);

531

502

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr,

533

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

534

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

535

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

536

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));

537

508

goto globalfail;

538

509

}

539

510

540

511

/* GnuTLS server initialization */

541

ret = gnutls_dh_params_init(&mc->dh_params);

512

ret = gnutls_dh_params_init(&mc.dh_params);

542

513

if(ret != GNUTLS_E_SUCCESS){

543

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

544

" initialization: %s\n",

545

safer_gnutls_strerror(ret));

514

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

515

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

546

516

goto globalfail;

547

517

}

548

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

518

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

549

519

if(ret != GNUTLS_E_SUCCESS){

550

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

551

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

552

522

goto globalfail;

553

523

}

554

524

555

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

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

556

526

557

527

return 0;

558

528

559

529

globalfail:

560

530

561

gnutls_certificate_free_credentials(mc->cred);

531

gnutls_certificate_free_credentials(mc.cred);

562

532

gnutls_global_deinit();

563

gnutls_dh_params_deinit(mc->dh_params);

533

gnutls_dh_params_deinit(mc.dh_params);

564

534

return -1;

565

535

}

566

536

567

static int init_gnutls_session(gnutls_session_t *session,

568

mandos_context *mc){

537

static int init_gnutls_session(gnutls_session_t *session){

569

538

int ret;

570

539

/* GnuTLS session creation */

571

540

do {

575

544

}

576

545

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

577

546

if(ret != GNUTLS_E_SUCCESS){

578

fprintf_plus(stderr,

579

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

580

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

581

549

}

582

550

583

551

{

584

552

const char *err;

585

553

do {

586

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

554

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

587

555

if(quit_now){

588

556

gnutls_deinit(*session);

589

557

return -1;

590

558

}

591

559

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

592

560

if(ret != GNUTLS_E_SUCCESS){

593

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

594

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

595

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));

596

564

gnutls_deinit(*session);

597

565

return -1;

598

566

}

600

568

601

569

do {

602

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

603

mc->cred);

571

mc.cred);

604

572

if(quit_now){

605

573

gnutls_deinit(*session);

606

574

return -1;

607

575

}

608

576

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

609

577

if(ret != GNUTLS_E_SUCCESS){

610

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

611

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

612

580

gnutls_deinit(*session);

613

581

return -1;

614

582

}

616

584

/* ignore client certificate if any. */

617

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

618

586

619

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

620

588

621

589

return 0;

622

590

}

626

594

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

627

595

628

596

/* Called when a Mandos server is found */

629

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

597

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

630

598

AvahiIfIndex if_index,

631

int af, mandos_context *mc){

599

int af){

632

600

int ret, tcp_sd = -1;

633

601

ssize_t sret;

634

602

union {

659

627

pf = PF_INET;

660

628

break;

661

629

default:

662

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

630

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

663

631

errno = EINVAL;

664

632

return -1;

665

633

}

666

634

667

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

668

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

669

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

670

bool match = false;

671

{

672

char *interface = NULL;

673

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

674

interface))){

675

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

676

match = true;

677

break;

678

}

679

}

680

}

681

if(not match){

682

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

683

connect to the server */

684

if(debug){

685

char interface[IF_NAMESIZE];

686

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

687

perror_plus("if_indextoname");

688

} else {

689

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

690

" \"%s\"\n",

691

if_indextoname((unsigned int)if_index,

692

interface));

693

}

694

}

695

return -1;

696

}

697

}

698

699

ret = init_gnutls_session(&session, mc);

635

ret = init_gnutls_session(&session);

700

636

if(ret != 0){

701

637

return -1;

702

638

}

703

639

704

640

if(debug){

705

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

706

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

641

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

642

"\n", ip, port);

707

643

}

708

644

709

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

671

}

736

672

if(ret == 0){

737

673

int e = errno;

738

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

674

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

739

675

errno = e;

740

676

goto mandos_end;

741

677

}

742

678

if(af == AF_INET6){

743

to.in6.sin6_port = htons(port);

744

#ifdef __GNUC__

745

#pragma GCC diagnostic push

746

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

747

#endif

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

748

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

749

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

750

#ifdef __GNUC__

751

#pragma GCC diagnostic pop

752

#endif

684

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

685

-Wunreachable-code*/

753

686

if(if_index == AVAHI_IF_UNSPEC){

754

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

755

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

756

689

errno = EINVAL;

757

690

goto mandos_end;

758

691

}

760

693

to.in6.sin6_scope_id = (uint32_t)if_index;

761

694

}

762

695

} else {

763

to.in.sin_port = htons(port);

696

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

697

-Wconversion and

698

-Wunreachable-code */

764

699

}

765

700

766

701

if(quit_now){

774

709

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

775

710

perror_plus("if_indextoname");

776

711

} else {

777

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

778

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

712

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

713

ip, interface, port);

779

714

}

780

715

} else {

781

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

782

ip, (uintmax_t)port);

716

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

717

port);

783

718

}

784

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

785

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

795

730

perror_plus("inet_ntop");

796

731

} else {

797

732

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

798

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

733

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

799

734

}

800

735

}

801

736

}

829

764

while(true){

830

765

size_t out_size = strlen(out);

831

766

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

832

out_size - written));

767

out_size - written));

833

768

if(ret == -1){

834

769

int e = errno;

835

770

perror_plus("write");

855

790

}

856

791

857

792

if(debug){

858

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

793

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

859

794

}

860

795

861

796

if(quit_now){

863

798

goto mandos_end;

864

799

}

865

800

866

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

867

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

868

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

869

gnutls_transport_set_ptr(session,

870

(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);

871

803

872

804

if(quit_now){

873

805

errno = EINTR;

884

816

885

817

if(ret != GNUTLS_E_SUCCESS){

886

818

if(debug){

887

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

819

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

888

820

gnutls_perror(ret);

889

821

}

890

822

errno = EPROTO;

894

826

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

895

827

896

828

if(debug){

897

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

898

" %s\n", ip);

829

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

830

ip);

899

831

}

900

832

901

833

while(true){

906

838

}

907

839

908

840

buffer_capacity = incbuffer(&buffer, buffer_length,

909

buffer_capacity);

841

buffer_capacity);

910

842

if(buffer_capacity == 0){

911

843

int e = errno;

912

844

perror_plus("incbuffer");

939

871

}

940

872

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

941

873

if(ret < 0){

942

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

943

"***\n");

874

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

944

875

gnutls_perror(ret);

945

876

errno = EPROTO;

946

877

goto mandos_end;

947

878

}

948

879

break;

949

880

default:

950

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

951

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

952

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

953

884

errno = EIO;

954

885

goto mandos_end;

959

890

}

960

891

961

892

if(debug){

962

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

893

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

963

894

}

964

895

965

896

if(quit_now){

977

908

978

909

if(buffer_length > 0){

979

910

ssize_t decrypted_buffer_size;

980

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

981

&decrypted_buffer, mc);

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

982

914

if(decrypted_buffer_size >= 0){

983

915

984

916

written = 0;

994

926

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

995

927

int e = errno;

996

928

if(debug){

997

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

998

strerror(errno));

929

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

930

strerror(errno));

999

931

}

1000

932

errno = e;

1001

933

goto mandos_end;

1045

977

AVAHI_GCC_UNUSED AvahiStringList *txt,

1046

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1047

979

flags,

1048

void* mc){

1049

if(r == NULL){

1050

return;

1051

}

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1052

982

1053

983

/* Called whenever a service has been resolved successfully or

1054

984

timed out */

1060

990

switch(event){

1061

991

default:

1062

992

case AVAHI_RESOLVER_FAILURE:

1063

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

1064

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

1065

domain,

1066

avahi_strerror(avahi_server_errno

1067

(((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)));

1068

996

break;

1069

997

1070

998

case AVAHI_RESOLVER_FOUND:

1072

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1073

1001

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

1074

1002

if(debug){

1075

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

1076

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

1077

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);

1078

1006

}

1079

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

1080

interface,

1081

avahi_proto_to_af(proto),

1082

mc);

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1083

1009

if(ret == 0){

1084

avahi_simple_poll_quit(simple_poll);

1010

avahi_simple_poll_quit(mc.simple_poll);

1085

1011

} else {

1086

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

1087

avahi_proto_to_af(proto),

1088

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

1089

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

1090

" list\n", name);

1091

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1092

1014

}

1093

1015

}

1094

1016

}

1104

1026

const char *domain,

1105

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1106

1028

flags,

1107

void* mc){

1108

if(b == NULL){

1109

return;

1110

}

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1111

1031

1112

1032

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

1113

1033

is removed from the LAN */

1120

1040

default:

1121

1041

case AVAHI_BROWSER_FAILURE:

1122

1042

1123

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

1124

avahi_strerror(avahi_server_errno

1125

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

1126

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);

1127

1046

return;

1128

1047

1129

1048

case AVAHI_BROWSER_NEW:

1132

1051

the callback function is called the Avahi server will free the

1133

1052

resolver for us. */

1134

1053

1135

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

1136

interface, protocol, name, type,

1137

domain, protocol, 0,

1138

resolve_callback, mc) == NULL)

1139

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

1140

" %s\n", name,

1141

avahi_strerror(avahi_server_errno

1142

(((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)));

1143

1059

break;

1144

1060

1145

1061

case AVAHI_BROWSER_REMOVE:

1148

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1149

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1150

1066

if(debug){

1151

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

1152

" searching...\n");

1067

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

1153

1068

}

1154

1069

break;

1155

1070

}

1164

1079

signal_received = sig;

1165

1080

int old_errno = errno;

1166

1081

/* set main loop to exit */

1167

if(simple_poll != NULL){

1168

avahi_simple_poll_quit(simple_poll);

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1169

1084

}

1170

1085

errno = old_errno;

1171

1086

}

1172

1087

1173

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

1174

int ret;

1175

error_t ret_errno;

1176

1177

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

1178

if(s < 0){

1179

ret_errno = errno;

1180

perror_plus("socket");

1181

errno = ret_errno;

1182

return false;

1183

}

1184

strcpy(ifr->ifr_name, ifname);

1185

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1186

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){

1187

1144

if(debug){

1188

ret_errno = errno;

1189

perror_plus("ioctl SIOCGIFFLAGS");

1190

errno = ret_errno;

1145

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

1146

flagstring, if_entry->d_name);

1191

1147

}

1192

return false;

1148

free(flagstring);

1149

return 0;

1193

1150

}

1194

return true;

1195

}

1196

1197

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

1198

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1199

1153

/* Reject the loopback device */

1200

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1201

1155

if(debug){

1202

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

1203

ifname);

1156

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

1157

if_entry->d_name);

1204

1158

}

1205

return false;

1159

return 0;

1206

1160

}

1207

1161

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

1208

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

1162

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

1209

1163

if(debug){

1210

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

1211

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

1164

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

1165

if_entry->d_name);

1212

1166

}

1213

return true;

1167

return 1;

1214

1168

}

1215

1169

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

1216

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

1170

if(not (flags & IFF_BROADCAST)){

1217

1171

if(debug){

1218

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1219

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

1172

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

1173

if_entry->d_name);

1220

1174

}

1221

return false;

1175

return 0;

1222

1176

}

1223

1177

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

1224

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1225

1179

if(debug){

1226

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

1227

ifname);

1180

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

1181

if_entry->d_name);

1228

1182

}

1229

return false;

1183

return 0;

1230

1184

}

1231

1232

1185

/* Accept this device */

1233

1186

if(debug){

1234

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

1235

}

1236

return true;

1237

}

1238

1239

/*

1240

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

1241

* corresponds to an acceptable network device.

1242

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

1243

*/

1244

int good_interface(const struct dirent *if_entry){

1245

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

1246

return 0;

1247

}

1248

1249

struct ifreq ifr;

1250

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

1251

if(debug){

1252

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

1253

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

1254

}

1255

return 0;

1256

}

1257

1258

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

1259

return 0;

1187

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

1188

if_entry->d_name);

1260

1189

}

1261

1190

return 1;

1262

1191

}

1263

1192

1264

/*

1265

* This function determines if a network interface is up.

1266

*/

1267

bool interface_is_up(const char *interface){

1268

struct ifreq ifr;

1269

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

1270

if(debug){

1271

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

1272

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

1273

}

1274

return false;

1275

}

1276

1277

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

1278

}

1279

1280

/*

1281

* This function determines if a network interface is running

1282

*/

1283

bool interface_is_running(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

1193

int notdotentries(const struct dirent *direntry){

1297

1194

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

1298

1195

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

1304

1201

return 1;

1305

1202

}

1306

1203

1307

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

1308

int runnable_hook(const struct dirent *direntry){

1309

int ret;

1310

size_t sret;

1311

struct stat st;

1312

1313

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

1314

/* Empty name? */

1315

return 0;

1316

}

1317

1318

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

1319

"abcdefghijklmnopqrstuvwxyz"

1320

"0123456789"

1321

"_-");

1322

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

1323

/* Contains non-allowed characters */

1324

if(debug){

1325

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

1326

direntry->d_name);

1327

}

1328

return 0;

1329

}

1330

1331

char *fullname = NULL;

1332

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

1333

if(ret < 0){

1334

perror_plus("asprintf");

1335

return 0;

1336

}

1337

1338

ret = stat(fullname, &st);

1339

if(ret == -1){

1340

if(debug){

1341

perror_plus("Could not stat hook");

1342

}

1343

return 0;

1344

}

1345

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

1346

/* Not a regular file */

1347

if(debug){

1348

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

1349

direntry->d_name);

1350

}

1351

return 0;

1352

}

1353

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

1354

/* Not executable */

1355

if(debug){

1356

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

1357

direntry->d_name);

1358

}

1359

return 0;

1360

}

1361

if(debug){

1362

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

1363

direntry->d_name);

1364

}

1365

return 1;

1366

}

1367

1368

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1369

mandos_context *mc){

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1370

1205

int ret;

1371

1206

struct timespec now;

1372

1207

struct timespec waited_time;

1373

1208

intmax_t block_time;

1374

1209

1375

1210

while(true){

1376

if(mc->current_server == NULL){

1211

if(mc.current_server == NULL){

1377

1212

if (debug){

1378

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

1379

" No timeout!\n");

1213

fprintf(stderr,

1214

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

1380

1215

}

1381

1216

ret = avahi_simple_poll_iterate(s, -1);

1382

1217

} else {

1383

1218

if (debug){

1384

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

1385

" it, or wait\n");

1219

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

1220

" or wait\n");

1386

1221

}

1387

1222

/* the current time */

1388

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1393

1228

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

1394

1229

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

1395

1230

waited_time.tv_sec = (now.tv_sec

1396

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

1231

- mc.current_server->last_seen.tv_sec);

1397

1232

waited_time.tv_nsec = (now.tv_nsec

1398

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

1233

- mc.current_server->last_seen.tv_nsec);

1399

1234

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

1400

1235

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

1401

1236

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

1404

1239

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

1405

1240

1406

1241

if (debug){

1407

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

1408

block_time);

1242

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

1409

1243

}

1410

1244

1411

1245

if(block_time <= 0){

1412

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

1413

mc->current_server->port,

1414

mc->current_server->if_index,

1415

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);

1416

1250

if(ret == 0){

1417

avahi_simple_poll_quit(s);

1251

avahi_simple_poll_quit(mc.simple_poll);

1418

1252

return 0;

1419

1253

}

1420

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1421

&mc->current_server->last_seen);

1255

&mc.current_server->last_seen);

1422

1256

if(ret == -1){

1423

1257

perror_plus("clock_gettime");

1424

1258

return -1;

1425

1259

}

1426

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

1260

mc.current_server = mc.current_server->next;

1427

1261

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

1428

1262

servers, but don't block */

1429

1263

}

1431

1265

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

1432

1266

}

1433

1267

if(ret != 0){

1434

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

1268

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

1435

1269

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

1436

1270

}

1437

1271

}

1438

1272

}

1439

1273

}

1440

1274

1441

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

1442

error_t raise_privileges(void){

1443

error_t old_errno = errno;

1444

error_t ret_errno = 0;

1445

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

1446

ret_errno = errno;

1447

perror_plus("seteuid");

1448

}

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

1453

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

1454

error_t raise_privileges_permanently(void){

1455

error_t old_errno = errno;

1456

error_t ret_errno = raise_privileges();

1457

if(ret_errno != 0){

1458

errno = old_errno;

1459

return ret_errno;

1460

}

1461

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

1462

ret_errno = errno;

1463

perror_plus("seteuid");

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

error_t lower_privileges(void){

1471

error_t old_errno = errno;

1472

error_t ret_errno = 0;

1473

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

1474

ret_errno = errno;

1475

perror_plus("seteuid");

1476

}

1477

errno = old_errno;

1478

return ret_errno;

1479

}

1480

1481

/* Lower privileges permanently */

1482

error_t lower_privileges_permanently(void){

1483

error_t old_errno = errno;

1484

error_t ret_errno = 0;

1485

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

1486

ret_errno = errno;

1487

perror_plus("setuid");

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1494

const float delay){

1495

struct dirent **direntries;

1496

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

1497

alphasort);

1498

if(numhooks == -1){

1499

if(errno == ENOENT){

1500

if(debug){

1501

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

1502

" found\n", hookdir);

1503

}

1504

} else {

1505

perror_plus("scandir");

1506

}

1507

} else {

1508

struct dirent *direntry;

1509

int ret;

1510

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

1511

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

1512

direntry = direntries[i];

1513

char *fullname = NULL;

1514

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

1515

if(ret < 0){

1516

perror_plus("asprintf");

1517

continue;

1518

}

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

pid_t hook_pid = fork();

1524

if(hook_pid == 0){

1525

/* Child */

1526

/* Raise privileges */

1527

raise_privileges_permanently();

1528

/* Set group */

1529

errno = 0;

1530

ret = setgid(0);

1531

if(ret == -1){

1532

perror_plus("setgid");

1533

}

1534

/* Reset supplementary groups */

1535

errno = 0;

1536

ret = setgroups(0, NULL);

1537

if(ret == -1){

1538

perror_plus("setgroups");

1539

}

1540

dup2(devnull, STDIN_FILENO);

1541

close(devnull);

1542

dup2(STDERR_FILENO, STDOUT_FILENO);

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

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

1559

if(ret == -1){

1560

perror_plus("setenv");

1561

_exit(EX_OSERR);

1562

}

1563

char *delaystring;

1564

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

1565

if(ret == -1){

1566

perror_plus("asprintf");

1567

_exit(EX_OSERR);

1568

}

1569

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

1570

if(ret == -1){

1571

free(delaystring);

1572

perror_plus("setenv");

1573

_exit(EX_OSERR);

1574

}

1575

free(delaystring);

1576

if(connect_to != NULL){

1577

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

1578

if(ret == -1){

1579

perror_plus("setenv");

1580

_exit(EX_OSERR);

1581

}

1582

}

1583

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

1584

perror_plus("execl");

1585

_exit(EXIT_FAILURE);

1586

}

1587

} else {

1588

int status;

1589

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

1590

perror_plus("waitpid");

1591

free(fullname);

1592

continue;

1593

}

1594

if(WIFEXITED(status)){

1595

if(WEXITSTATUS(status) != 0){

1596

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

1597

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

1598

WEXITSTATUS(status));

1599

free(fullname);

1600

continue;

1601

}

1602

} else if(WIFSIGNALED(status)){

1603

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

1604

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

1605

WTERMSIG(status));

1606

free(fullname);

1607

continue;

1608

} else {

1609

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

1610

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

1611

free(fullname);

1612

continue;

1613

}

1614

}

1615

free(fullname);

1616

if(debug){

1617

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

1618

direntry->d_name);

1619

}

1620

}

1621

close(devnull);

1622

}

1623

return true;

1624

}

1625

1626

error_t bring_up_interface(const char *const interface,

1627

const float delay){

1628

int sd = -1;

1629

error_t old_errno = errno;

1630

error_t ret_errno = 0;

1631

int ret, ret_setflags;

1632

struct ifreq network;

1633

unsigned int if_index = if_nametoindex(interface);

1634

if(if_index == 0){

1635

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

1636

errno = old_errno;

1637

return ENXIO;

1638

}

1639

1640

if(quit_now){

1641

errno = old_errno;

1642

return EINTR;

1643

}

1644

1645

if(not interface_is_up(interface)){

1646

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

1647

ret_errno = errno;

1648

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

1649

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

1650

return ret_errno;

1651

}

1652

network.ifr_flags |= IFF_UP;

1653

1654

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1655

if(sd < 0){

1656

ret_errno = errno;

1657

perror_plus("socket");

1658

errno = old_errno;

1659

return ret_errno;

1660

}

1661

1662

if(quit_now){

1663

close(sd);

1664

errno = old_errno;

1665

return EINTR;

1666

}

1667

1668

if(debug){

1669

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

1670

interface);

1671

}

1672

1673

/* Raise priviliges */

1674

raise_privileges();

1675

1676

#ifdef __linux__

1677

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1678

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

1679

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

1680

bool restore_loglevel = true;

1681

if(ret_linux == -1){

1682

restore_loglevel = false;

1683

perror_plus("klogctl");

1684

}

1685

#endif /* __linux__ */

1686

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

1687

ret_errno = errno;

1688

#ifdef __linux__

1689

if(restore_loglevel){

1690

ret_linux = klogctl(7, NULL, 0);

1691

if(ret_linux == -1){

1692

perror_plus("klogctl");

1693

}

1694

}

1695

#endif /* __linux__ */

1696

1697

/* Lower privileges */

1698

lower_privileges();

1699

1700

/* Close the socket */

1701

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

1702

if(ret == -1){

1703

perror_plus("close");

1704

}

1705

1706

if(ret_setflags == -1){

1707

errno = ret_errno;

1708

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1709

errno = old_errno;

1710

return ret_errno;

1711

}

1712

} else if(debug){

1713

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

1714

interface);

1715

}

1716

1717

/* Sleep checking until interface is running.

1718

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

1719

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

1720

if(interface_is_running(interface)){

1721

break;

1722

}

1723

struct timespec sleeptime = { .tv_nsec = 250000000 };

1724

ret = nanosleep(&sleeptime, NULL);

1725

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

1726

perror_plus("nanosleep");

1727

}

1728

}

1729

1730

errno = old_errno;

1731

return 0;

1732

}

1733

1734

error_t take_down_interface(const char *const interface){

1735

error_t old_errno = errno;

1736

struct ifreq network;

1737

unsigned int if_index = if_nametoindex(interface);

1738

if(if_index == 0){

1739

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

1740

errno = old_errno;

1741

return ENXIO;

1742

}

1743

if(interface_is_up(interface)){

1744

error_t ret_errno = 0;

1745

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

1746

ret_errno = errno;

1747

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

1748

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

1749

return ret_errno;

1750

}

1751

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

1752

1753

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

1754

if(sd < 0){

1755

ret_errno = errno;

1756

perror_plus("socket");

1757

errno = old_errno;

1758

return ret_errno;

1759

}

1760

1761

if(debug){

1762

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

1763

interface);

1764

}

1765

1766

/* Raise priviliges */

1767

raise_privileges();

1768

1769

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

1770

ret_errno = errno;

1771

1772

/* Lower privileges */

1773

lower_privileges();

1774

1775

/* Close the socket */

1776

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

1777

if(ret == -1){

1778

perror_plus("close");

1779

}

1780

1781

if(ret_setflags == -1){

1782

errno = ret_errno;

1783

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1784

errno = old_errno;

1785

return ret_errno;

1786

}

1787

} else if(debug){

1788

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

1789

interface);

1790

}

1791

1792

errno = old_errno;

1793

return 0;

1794

}

1795

1796

1275

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

1797

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

1798

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

1799

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

1800

.interfaces = NULL, .interfaces_size = 0 };

1801

1276

AvahiSServiceBrowser *sb = NULL;

1802

error_t ret_errno;

1277

int error;

1803

1278

int ret;

1804

1279

intmax_t tmpmax;

1805

1280

char *tmp;

1806

1281

int exitcode = EXIT_SUCCESS;

1807

char *interfaces_to_take_down = NULL;

1808

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;

1809

1288

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

1810

1289

bool tempdir_created = false;

1811

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1812

1291

const char *seckey = PATHDIR "/" SECKEY;

1813

1292

const char *pubkey = PATHDIR "/" PUBKEY;

1814

char *interfaces_hooks = NULL;

1815

1293

1816

1294

bool gnutls_initialized = false;

1817

1295

bool gpgme_initialized = false;

1879

1357

.group = 2 },

1880

1358

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

1881

1359

.arg = "SECONDS",

1882

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

1883

.group = 2 },

1884

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

1885

.arg = "DIR",

1886

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

1360

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

1887

1361

.group = 2 },

1888

1362

/*

1889

1363

* These reproduce what we would get without ARGP_NO_HELP

1908

1382

connect_to = arg;

1909

1383

break;

1910

1384

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

1911

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

1912

arg, (int)',');

1913

if(ret_errno != 0){

1914

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

1915

}

1385

interface = arg;

1916

1386

break;

1917

1387

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

1918

1388

seckey = arg;

1947

1417

argp_error(state, "Bad retry interval");

1948

1418

}

1949

1419

break;

1950

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

1951

hookdir = arg;

1952

break;

1953

1420

/*

1954

1421

* These reproduce what we would get without ARGP_NO_HELP

1955

1422

*/

1961

1428

argp_state_help(state, state->out_stream,

1962

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1963

1430

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

1964

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

1431

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

1965

1432

exit(argp_err_exit_status);

1966

1433

break;

1967

1434

default:

1994

1461

{

1995

1462

/* Work around Debian bug #633582:

1996

1463

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

1464

struct stat st;

1997

1465

1998

1466

/* Re-raise priviliges */

1999

if(raise_privileges() == 0){

2000

struct stat st;

2001

2002

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

2003

int seckey_fd = open(seckey, O_RDONLY);

2004

if(seckey_fd == -1){

2005

perror_plus("open");

2006

} else {

2007

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

2008

if(ret == -1){

2009

perror_plus("fstat");

2010

} else {

2011

if(S_ISREG(st.st_mode)

2012

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

2013

ret = fchown(seckey_fd, uid, gid);

2014

if(ret == -1){

2015

perror_plus("fchown");

2016

}

2017

}

2018

}

2019

TEMP_FAILURE_RETRY(close(seckey_fd));

2020

}

2021

}

2022

2023

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

2024

int pubkey_fd = open(pubkey, O_RDONLY);

2025

if(pubkey_fd == -1){

2026

perror_plus("open");

2027

} else {

2028

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

2029

if(ret == -1){

2030

perror_plus("fstat");

2031

} else {

2032

if(S_ISREG(st.st_mode)

2033

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

2034

ret = fchown(pubkey_fd, uid, gid);

2035

if(ret == -1){

2036

perror_plus("fchown");

2037

}

2038

}

2039

}

2040

TEMP_FAILURE_RETRY(close(pubkey_fd));

2041

}

2042

}

2043

2044

/* Lower privileges */

2045

lower_privileges();

2046

}

2047

}

2048

2049

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

2050

{

2051

char *interface = NULL;

2052

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

2053

interface))){

2054

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

2055

and if_nametoindex(interface) == 0){

2056

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

2057

fprintf_plus(stderr, "Not using nonexisting interface"

2058

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

2059

}

2060

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

2061

interface = NULL;

2062

}

2063

}

2064

}

2065

2066

/* Run network hooks */

2067

{

2068

if(mc.interfaces != NULL){

2069

interfaces_hooks = malloc(mc.interfaces_size);

2070

if(interfaces_hooks == NULL){

2071

perror_plus("malloc");

2072

goto end;

2073

}

2074

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

2075

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

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

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");

2080

1518

}

2081

1519

}

2082

1520

2083

1521

if(not debug){

2084

1522

avahi_set_log_function(empty_log);

2085

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

}

2086

1549

2087

1550

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

2088

1551

from the signal handler */

2089

1552

/* Initialize the pseudo-RNG for Avahi */

2090

1553

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

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

2093

fprintf_plus(stderr,

2094

"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");

2095

1557

exitcode = EX_UNAVAILABLE;

2096

1558

goto end;

2097

1559

}

2159

1621

}

2160

1622

}

2161

1623

2162

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

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

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

2171

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

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

errno = ret_errno;

2175

perror_plus("argz_add");

2176

continue;

2177

}

2178

if(debug){

2179

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

2180

direntries[i]->d_name);

2181

}

2182

}

2183

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

}

2184

1760

} else {

2185

free(direntries);

2186

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

2187

exitcode = EXIT_FAILURE;

2188

goto end;

2189

}

2190

}

2191

2192

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

2193

{

2194

char *interface = NULL;

2195

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

2196

interface))){

2197

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

2198

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

2199

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

2200

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

2201

interface);

2202

interface = NULL;

2203

while((interface = argz_next(mc.interfaces,

2204

mc.interfaces_size, interface))){

2205

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

2206

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

2207

interface);

2208

interface = NULL;

2209

}

2210

}

2211

break;

2212

}

2213

bool interface_was_up = interface_is_up(interface);

2214

ret = bring_up_interface(interface, delay);

2215

if(not interface_was_up){

2216

if(ret != 0){

2217

errno = ret;

2218

perror_plus("Failed to bring up interface");

2219

} else {

2220

ret_errno = argz_add(&interfaces_to_take_down,

2221

&interfaces_to_take_down_size,

2222

interface);

2223

if(ret_errno != 0){

2224

errno = ret_errno;

2225

perror_plus("argz_add");

2226

}

2227

}

2228

}

2229

}

2230

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

2231

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

2232

}

2233

}

2234

2235

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

2236

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

2237

if(debug){

2238

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

2239

mc.interfaces);

2240

}

2241

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

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

2242

1767

}

2243

1768

2244

1769

if(quit_now){

2245

1770

goto end;

2246

1771

}

2247

1772

2248

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

1773

ret = init_gnutls_global(pubkey, seckey);

2249

1774

if(ret == -1){

2250

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

1775

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

2251

1776

exitcode = EX_UNAVAILABLE;

2252

1777

goto end;

2253

1778

} else {

2268

1793

goto end;

2269

1794

}

2270

1795

2271

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

2272

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

1796

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

1797

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

2273

1798

exitcode = EX_UNAVAILABLE;

2274

1799

goto end;

2275

1800

} else {

2284

1809

/* Connect directly, do not use Zeroconf */

2285

1810

/* (Mainly meant for debugging) */

2286

1811

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

2287

2288

1812

if(address == NULL){

2289

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

1813

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

2290

1814

exitcode = EX_USAGE;

2291

1815

goto end;

2292

1816

}

2295

1819

goto end;

2296

1820

}

2297

1821

2298

in_port_t port;

1822

uint16_t port;

2299

1823

errno = 0;

2300

1824

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

2301

1825

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

2302

or tmpmax != (in_port_t)tmpmax){

2303

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2304

1828

exitcode = EX_USAGE;

2305

1829

goto end;

2306

1830

}

2307

1831

2308

1832

if(quit_now){

2309

1833

goto end;

2310

1834

}

2311

1835

2312

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2313

1837

*address = '\0';

2314

1838

/* Colon in address indicates IPv6 */

2315

1839

int af;

2331

1855

}

2332

1856

2333

1857

while(not quit_now){

2334

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

2335

&mc);

1858

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

2336

1859

if(quit_now or ret == 0){

2337

1860

break;

2338

1861

}

2339

1862

if(debug){

2340

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

2341

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2342

1865

}

2343

sleep((unsigned int)retry_interval);

1866

sleep((int)retry_interval);

2344

1867

}

2345

1868

2346

1869

if (not quit_now){

2347

1870

exitcode = EXIT_SUCCESS;

2348

1871

}

2349

1872

2350

1873

goto end;

2351

1874

}

2352

1875

2364

1887

config.publish_domain = 0;

2365

1888

2366

1889

/* Allocate a new server */

2367

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2368

&config, NULL, NULL, &ret_errno);

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2369

1893

2370

1894

/* Free the Avahi configuration data */

2371

1895

avahi_server_config_free(&config);

2373

1897

2374

1898

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

2375

1899

if(mc.server == NULL){

2376

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

2377

avahi_strerror(ret_errno));

1900

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

1901

avahi_strerror(error));

2378

1902

exitcode = EX_UNAVAILABLE;

2379

1903

goto end;

2380

1904

}

2386

1910

/* Create the Avahi service browser */

2387

1911

sb = avahi_s_service_browser_new(mc.server, if_index,

2388

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2389

NULL, 0, browse_callback,

2390

(void *)&mc);

1913

NULL, 0, browse_callback, NULL);

2391

1914

if(sb == NULL){

2392

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

2393

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)));

2394

1917

exitcode = EX_UNAVAILABLE;

2395

1918

goto end;

2396

1919

}

2402

1925

/* Run the main loop */

2403

1926

2404

1927

if(debug){

2405

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

1928

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

2406

1929

}

2407

1930

2408

ret = avahi_loop_with_timeout(simple_poll,

2409

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

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2410

1933

if(debug){

2411

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

2412

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

1934

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

1935

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

2413

1936

}

2414

1937

2415

1938

end:

2416

1939

2417

1940

if(debug){

2418

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

1941

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

2419

1942

}

2420

1943

2421

1944

/* Cleanup things */

2422

free(mc.interfaces);

2423

2424

1945

if(sb != NULL)

2425

1946

avahi_s_service_browser_free(sb);

2426

1947

2427

1948

if(mc.server != NULL)

2428

1949

avahi_server_free(mc.server);

2429

1950

2430

if(simple_poll != NULL)

2431

avahi_simple_poll_free(simple_poll);

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2432

1953

2433

1954

if(gnutls_initialized){

2434

1955

gnutls_certificate_free_credentials(mc.cred);

2439

1960

if(gpgme_initialized){

2440

1961

gpgme_release(mc.ctx);

2441

1962

}

2442

1963

2443

1964

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

2444

1965

has seen */

2445

1966

if(mc.current_server != NULL){

2451

1972

}

2452

1973

}

2453

1974

2454

/* Re-raise priviliges */

2455

{

2456

raise_privileges();

2457

2458

/* Run network hooks */

2459

run_network_hooks("stop", interfaces_hooks != NULL ?

2460

interfaces_hooks : "", delay);

2461

2462

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

2463

{

2464

char *interface = NULL;

2465

while((interface=argz_next(interfaces_to_take_down,

2466

interfaces_to_take_down_size,

2467

interface))){

2468

ret_errno = take_down_interface(interface);

2469

if(ret_errno != 0){

2470

errno = ret_errno;

2471

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");

2472

1992

}

2473

1993

}

2474

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

2475

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

2476

" 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");

2477

2003

}

2478

2004

}

2479

2480

lower_privileges_permanently();

2481

2005

}

2482

2006

2483

free(interfaces_to_take_down);

2484

free(interfaces_hooks);

2485

2486

2007

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

2487

2008

if(tempdir_created){

2488

2009

struct dirent **direntries = NULL;

2501

2022

}

2502

2023

ret = remove(fullname);

2503

2024

if(ret == -1){

2504

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

2505

strerror(errno));

2025

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

2026

strerror(errno));

2506

2027

}

2507

2028

free(fullname);

2508

2029

}