/mandos/release : revision 237.16.2

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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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opendir(), DIR */

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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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getnameinfo() */

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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

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

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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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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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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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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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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return false;

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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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}

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return true;

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mc.current_server->prev = new_server;

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}

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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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}

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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);

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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" */

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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",

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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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static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

327

size_t crypto_size,

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char **plaintext,

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mandos_context *mc){

328

char **plaintext){

357

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gpgme_data_t dh_crypto, dh_plain;

358

330

gpgme_error_t rc;

359

331

ssize_t ret;

361

333

ssize_t plaintext_length = 0;

362

334

363

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if(debug){

364

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

336

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

365

337

}

366

338

367

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

368

340

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

369

341

0);

370

342

if(rc != GPG_ERR_NO_ERROR){

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

373

345

return -1;

374

346

}

375

347

376

348

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

377

349

rc = gpgme_data_new(&dh_plain);

378

350

if(rc != GPG_ERR_NO_ERROR){

379

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

380

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

381

gpgme_strsource(rc), gpgme_strerror(rc));

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

382

353

gpgme_data_release(dh_crypto);

383

354

return -1;

384

355

}

385

356

386

357

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

387

358

data buffer */

388

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

359

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

389

360

if(rc != GPG_ERR_NO_ERROR){

390

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

391

gpgme_strsource(rc), gpgme_strerror(rc));

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

392

363

plaintext_length = -1;

393

364

if(debug){

394

365

gpgme_decrypt_result_t result;

395

result = gpgme_op_decrypt_result(mc->ctx);

366

result = gpgme_op_decrypt_result(mc.ctx);

396

367

if(result == NULL){

397

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

368

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

398

369

} else {

399

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

400

result->unsupported_algorithm);

401

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

402

result->wrong_key_usage);

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

403

374

if(result->file_name != NULL){

404

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

375

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

405

376

}

406

377

gpgme_recipient_t recipient;

407

378

recipient = result->recipients;

408

379

while(recipient != NULL){

409

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

410

gpgme_pubkey_algo_name

411

(recipient->pubkey_algo));

412

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

413

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

414

recipient->status == GPG_ERR_NO_SECKEY

415

? "No" : "Yes");

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

416

386

recipient = recipient->next;

417

387

}

418

388

}

421

391

}

422

392

423

393

if(debug){

424

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

394

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

425

395

}

426

396

427

397

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

434

404

*plaintext = NULL;

435

405

while(true){

436

406

plaintext_capacity = incbuffer(plaintext,

437

(size_t)plaintext_length,

438

plaintext_capacity);

407

(size_t)plaintext_length,

408

plaintext_capacity);

439

409

if(plaintext_capacity == 0){

440

perror_plus("incbuffer");

441

plaintext_length = -1;

442

goto decrypt_end;

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

443

413

}

444

414

445

415

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

458

428

}

459

429

460

430

if(debug){

461

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

431

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

462

432

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

463

433

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

464

434

}

476

446

}

477

447

478

448

static const char * safer_gnutls_strerror(int value){

479

const char *ret = gnutls_strerror(value);

449

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

450

-Wunreachable-code */

480

451

if(ret == NULL)

481

452

ret = "(unknown)";

482

453

return ret;

485

456

/* GnuTLS log function callback */

486

457

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

487

458

const char* string){

488

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

459

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

489

460

}

490

461

491

462

static int init_gnutls_global(const char *pubkeyfilename,

492

const char *seckeyfilename,

493

mandos_context *mc){

463

const char *seckeyfilename){

494

464

int ret;

495

465

496

466

if(debug){

497

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

467

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

498

468

}

499

469

500

470

ret = gnutls_global_init();

501

471

if(ret != GNUTLS_E_SUCCESS){

502

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

503

safer_gnutls_strerror(ret));

472

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

473

safer_gnutls_strerror(ret));

504

474

return -1;

505

475

}

506

476

513

483

}

514

484

515

485

/* OpenPGP credentials */

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

517

487

if(ret != GNUTLS_E_SUCCESS){

518

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

519

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

520

490

gnutls_global_deinit();

521

491

return -1;

522

492

}

523

493

524

494

if(debug){

525

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

526

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

527

pubkeyfilename,

528

seckeyfilename);

495

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

496

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

497

seckeyfilename);

529

498

}

530

499

531

500

ret = gnutls_certificate_set_openpgp_key_file

532

(mc->cred, pubkeyfilename, seckeyfilename,

501

(mc.cred, pubkeyfilename, seckeyfilename,

533

502

GNUTLS_OPENPGP_FMT_BASE64);

534

503

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr,

536

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

537

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

538

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

539

safer_gnutls_strerror(ret));

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

540

509

goto globalfail;

541

510

}

542

511

543

512

/* GnuTLS server initialization */

544

ret = gnutls_dh_params_init(&mc->dh_params);

513

ret = gnutls_dh_params_init(&mc.dh_params);

545

514

if(ret != GNUTLS_E_SUCCESS){

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

" initialization: %s\n",

548

safer_gnutls_strerror(ret));

515

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

516

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

549

517

goto globalfail;

550

518

}

551

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

519

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

552

520

if(ret != GNUTLS_E_SUCCESS){

553

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

554

safer_gnutls_strerror(ret));

521

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

522

safer_gnutls_strerror(ret));

555

523

goto globalfail;

556

524

}

557

525

558

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

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

559

527

560

528

return 0;

561

529

562

530

globalfail:

563

531

564

gnutls_certificate_free_credentials(mc->cred);

532

gnutls_certificate_free_credentials(mc.cred);

565

533

gnutls_global_deinit();

566

gnutls_dh_params_deinit(mc->dh_params);

534

gnutls_dh_params_deinit(mc.dh_params);

567

535

return -1;

568

536

}

569

537

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

538

static int init_gnutls_session(gnutls_session_t *session){

572

539

int ret;

573

540

/* GnuTLS session creation */

574

541

do {

578

545

}

579

546

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

580

547

if(ret != GNUTLS_E_SUCCESS){

581

fprintf_plus(stderr,

582

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

583

safer_gnutls_strerror(ret));

548

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

549

safer_gnutls_strerror(ret));

584

550

}

585

551

586

552

{

587

553

const char *err;

588

554

do {

589

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

555

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

590

556

if(quit_now){

591

557

gnutls_deinit(*session);

592

558

return -1;

593

559

}

594

560

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

595

561

if(ret != GNUTLS_E_SUCCESS){

596

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

597

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

598

safer_gnutls_strerror(ret));

562

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

563

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

564

safer_gnutls_strerror(ret));

599

565

gnutls_deinit(*session);

600

566

return -1;

601

567

}

603

569

604

570

do {

605

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

606

mc->cred);

572

mc.cred);

607

573

if(quit_now){

608

574

gnutls_deinit(*session);

609

575

return -1;

610

576

}

611

577

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

612

578

if(ret != GNUTLS_E_SUCCESS){

613

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

614

safer_gnutls_strerror(ret));

579

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

580

safer_gnutls_strerror(ret));

615

581

gnutls_deinit(*session);

616

582

return -1;

617

583

}

619

585

/* ignore client certificate if any. */

620

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

621

587

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

623

589

624

590

return 0;

625

591

}

629

595

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

630

596

631

597

/* Called when a Mandos server is found */

632

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

598

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

633

599

AvahiIfIndex if_index,

634

int af, mandos_context *mc){

600

int af){

635

601

int ret, tcp_sd = -1;

636

602

ssize_t sret;

637

603

union {

662

628

pf = PF_INET;

663

629

break;

664

630

default:

665

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

631

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

666

632

errno = EINVAL;

667

633

return -1;

668

634

}

669

635

670

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

671

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

672

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

673

bool match = false;

674

{

675

char *interface = NULL;

676

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

677

interface))){

678

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

679

match = true;

680

break;

681

}

682

}

683

}

684

if(not match){

685

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

686

connect to the server */

687

if(debug){

688

char interface[IF_NAMESIZE];

689

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

690

perror_plus("if_indextoname");

691

} else {

692

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

693

" \"%s\"\n",

694

if_indextoname((unsigned int)if_index,

695

interface));

696

}

697

}

698

return -1;

699

}

700

}

701

702

ret = init_gnutls_session(&session, mc);

636

ret = init_gnutls_session(&session);

703

637

if(ret != 0){

704

638

return -1;

705

639

}

706

640

707

641

if(debug){

708

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

709

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

642

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

643

"\n", ip, port);

710

644

}

711

645

712

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

738

672

}

739

673

if(ret == 0){

740

674

int e = errno;

741

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

675

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

742

676

errno = e;

743

677

goto mandos_end;

744

678

}

745

679

if(af == AF_INET6){

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

751

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

685

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

686

-Wunreachable-code*/

756

687

if(if_index == AVAHI_IF_UNSPEC){

757

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

758

" incomplete without a network interface\n");

688

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

689

" without a network interface\n");

759

690

errno = EINVAL;

760

691

goto mandos_end;

761

692

}

763

694

to.in6.sin6_scope_id = (uint32_t)if_index;

764

695

}

765

696

} else {

766

to.in.sin_port = htons(port);

697

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

698

-Wconversion and

699

-Wunreachable-code */

767

700

}

768

701

769

702

if(quit_now){

777

710

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

778

711

perror_plus("if_indextoname");

779

712

} else {

780

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

781

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

713

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

714

ip, interface, port);

782

715

}

783

716

} else {

784

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

785

ip, (uintmax_t)port);

717

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

718

port);

786

719

}

787

720

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

788

721

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

722

const char *pcret;

789

723

if(af == AF_INET6){

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

724

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

725

sizeof(addrstr));

793

726

} else {

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

727

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

728

sizeof(addrstr));

797

729

}

798

if(ret == EAI_SYSTEM){

799

perror_plus("getnameinfo");

800

} else if(ret != 0) {

801

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

802

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

803

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

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

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

734

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

735

}

804

736

}

805

737

}

806

738

833

765

while(true){

834

766

size_t out_size = strlen(out);

835

767

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

836

out_size - written));

768

out_size - written));

837

769

if(ret == -1){

838

770

int e = errno;

839

771

perror_plus("write");

859

791

}

860

792

861

793

if(debug){

862

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

794

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

863

795

}

864

796

865

797

if(quit_now){

867

799

goto mandos_end;

868

800

}

869

801

870

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

871

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

872

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

873

gnutls_transport_set_ptr(session,

874

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

804

876

805

if(quit_now){

877

806

errno = EINTR;

888

817

889

818

if(ret != GNUTLS_E_SUCCESS){

890

819

if(debug){

891

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

820

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

892

821

gnutls_perror(ret);

893

822

}

894

823

errno = EPROTO;

898

827

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

899

828

900

829

if(debug){

901

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

902

" %s\n", ip);

830

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

831

ip);

903

832

}

904

833

905

834

while(true){

910

839

}

911

840

912

841

buffer_capacity = incbuffer(&buffer, buffer_length,

913

buffer_capacity);

842

buffer_capacity);

914

843

if(buffer_capacity == 0){

915

844

int e = errno;

916

845

perror_plus("incbuffer");

943

872

}

944

873

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

945

874

if(ret < 0){

946

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

947

"***\n");

875

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

948

876

gnutls_perror(ret);

949

877

errno = EPROTO;

950

878

goto mandos_end;

951

879

}

952

880

break;

953

881

default:

954

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

955

" encrypted session with Mandos server\n");

882

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

883

" encrypted session with Mandos server\n");

956

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

957

885

errno = EIO;

958

886

goto mandos_end;

963

891

}

964

892

965

893

if(debug){

966

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

894

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

967

895

}

968

896

969

897

if(quit_now){

981

909

982

910

if(buffer_length > 0){

983

911

ssize_t decrypted_buffer_size;

984

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

985

&decrypted_buffer, mc);

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

986

915

if(decrypted_buffer_size >= 0){

987

916

988

917

written = 0;

998

927

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

999

928

int e = errno;

1000

929

if(debug){

1001

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

1002

strerror(errno));

930

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

931

strerror(errno));

1003

932

}

1004

933

errno = e;

1005

934

goto mandos_end;

1049

978

AVAHI_GCC_UNUSED AvahiStringList *txt,

1050

979

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1051

980

flags,

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1056

983

1057

984

/* Called whenever a service has been resolved successfully or

1058

985

timed out */

1064

991

switch(event){

1065

992

default:

1066

993

case AVAHI_RESOLVER_FAILURE:

1067

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

1068

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

1069

domain,

1070

avahi_strerror(avahi_server_errno

1071

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

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1072

997

break;

1073

998

1074

999

case AVAHI_RESOLVER_FOUND:

1076

1001

char ip[AVAHI_ADDRESS_STR_MAX];

1077

1002

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

1078

1003

if(debug){

1079

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

1080

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

1081

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

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1082

1007

}

1083

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

1084

interface,

1085

avahi_proto_to_af(proto),

1086

mc);

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1087

1010

if(ret == 0){

1088

avahi_simple_poll_quit(simple_poll);

1011

avahi_simple_poll_quit(mc.simple_poll);

1089

1012

} else {

1090

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

1091

avahi_proto_to_af(proto),

1092

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

1093

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

1094

" list\n", name);

1095

}

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1096

1015

}

1097

1016

}

1098

1017

}

1108

1027

const char *domain,

1109

1028

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1110

1029

flags,

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1115

1032

1116

1033

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

1117

1034

is removed from the LAN */

1124

1041

default:

1125

1042

case AVAHI_BROWSER_FAILURE:

1126

1043

1127

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

1128

avahi_strerror(avahi_server_errno

1129

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

1130

avahi_simple_poll_quit(simple_poll);

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1131

1047

return;

1132

1048

1133

1049

case AVAHI_BROWSER_NEW:

1136

1052

the callback function is called the Avahi server will free the

1137

1053

resolver for us. */

1138

1054

1139

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

1140

interface, protocol, name, type,

1141

domain, protocol, 0,

1142

resolve_callback, mc) == NULL)

1143

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

1144

" %s\n", name,

1145

avahi_strerror(avahi_server_errno

1146

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

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1147

1060

break;

1148

1061

1149

1062

case AVAHI_BROWSER_REMOVE:

1152

1065

case AVAHI_BROWSER_ALL_FOR_NOW:

1153

1066

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1154

1067

if(debug){

1155

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

1156

" searching...\n");

1068

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

1157

1069

}

1158

1070

break;

1159

1071

}

1168

1080

signal_received = sig;

1169

1081

int old_errno = errno;

1170

1082

/* set main loop to exit */

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1173

1085

}

1174

1086

errno = old_errno;

1175

1087

}

1176

1088

1177

1089

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

1178

1090

int ret;

1179

error_t ret_errno;

1180

1091

1181

1092

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

1182

1093

if(s < 0){

1183

ret_errno = errno;

1184

1094

perror_plus("socket");

1185

errno = ret_errno;

1186

1095

return false;

1187

1096

}

1188

1097

strcpy(ifr->ifr_name, ifname);

1189

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1190

1099

if(ret == -1){

1191

1100

if(debug){

1192

ret_errno = errno;

1193

1101

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1195

1102

}

1196

1103

return false;

1197

1104

}

1203

1110

/* Reject the loopback device */

1204

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1205

1112

if(debug){

1206

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

1207

ifname);

1113

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

1114

ifname);

1208

1115

}

1209

1116

return false;

1210

1117

}

1211

1118

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

1212

1119

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

1213

1120

if(debug){

1214

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

1215

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

1121

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

1122

ifname);

1216

1123

}

1217

1124

return true;

1218

1125

}

1219

1126

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

1220

1127

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

1221

1128

if(debug){

1222

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1223

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

1129

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

1130

ifname);

1224

1131

}

1225

1132

return false;

1226

1133

}

1227

1134

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

1228

1135

if(ifr->ifr_flags & IFF_NOARP){

1229

1136

if(debug){

1230

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

1231

ifname);

1137

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

1232

1138

}

1233

1139

return false;

1234

1140

}

1235

1141

1236

1142

/* Accept this device */

1237

1143

if(debug){

1238

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

1144

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

1239

1145

}

1240

1146

return true;

1241

1147

}

1253

1159

struct ifreq ifr;

1254

1160

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

1255

1161

if(debug){

1256

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

1257

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

1258

}

1259

return 0;

1260

}

1261

1262

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

1263

return 0;

1264

}

1265

return 1;

1266

}

1267

1268

/*

1269

* This function determines if a network interface is up.

1270

*/

1271

bool interface_is_up(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1282

}

1283

1284

/*

1285

* This function determines if a network interface is running

1286

*/

1287

bool interface_is_running(const char *interface){

1288

struct ifreq ifr;

1289

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

1290

if(debug){

1291

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

1292

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

1293

}

1294

return false;

1295

}

1296

1297

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

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

if(not (ifr.ifr_flags & IFF_UP)){

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

if(not (ifr.ifr_flags & IFF_RUNNING)){

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1298

1215

}

1299

1216

1300

1217

int notdotentries(const struct dirent *direntry){

1311

1228

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

1312

1229

int runnable_hook(const struct dirent *direntry){

1313

1230

int ret;

1314

size_t sret;

1315

1231

struct stat st;

1316

1232

1317

1233

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

1319

1235

return 0;

1320

1236

}

1321

1237

1322

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

1323

"abcdefghijklmnopqrstuvwxyz"

1324

"0123456789"

1325

"_-");

1326

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

1327

/* Contains non-allowed characters */

1328

if(debug){

1329

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

1330

direntry->d_name);

1331

}

1332

return 0;

1333

}

1334

1335

char *fullname = NULL;

1336

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

1337

if(ret < 0){

1338

perror_plus("asprintf");

1339

return 0;

1340

}

1341

1342

ret = stat(fullname, &st);

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1343

1255

if(ret == -1){

1344

1256

if(debug){

1345

perror_plus("Could not stat hook");

1257

perror_plus("Could not stat plugin");

1346

1258

}

1347

1259

return 0;

1348

1260

}

1349

1261

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

1350

1262

/* Not a regular file */

1351

if(debug){

1352

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

1353

direntry->d_name);

1354

}

1355

1263

return 0;

1356

1264

}

1357

1265

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

1358

1266

/* Not executable */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

1267

return 0;

1364

1268

}

1365

if(debug){

1366

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

1367

direntry->d_name);

1368

}

1369

1269

return 1;

1370

1270

}

1371

1271

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

mandos_context *mc){

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1374

1273

int ret;

1375

1274

struct timespec now;

1376

1275

struct timespec waited_time;

1377

1276

intmax_t block_time;

1378

1277

1379

1278

while(true){

1380

if(mc->current_server == NULL){

1279

if(mc.current_server == NULL){

1381

1280

if (debug){

1382

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

1383

" No timeout!\n");

1281

fprintf(stderr,

1282

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

1384

1283

}

1385

1284

ret = avahi_simple_poll_iterate(s, -1);

1386

1285

} else {

1387

1286

if (debug){

1388

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

1389

" it, or wait\n");

1287

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

1288

" or wait\n");

1390

1289

}

1391

1290

/* the current time */

1392

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1397

1296

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

1398

1297

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

1399

1298

waited_time.tv_sec = (now.tv_sec

1400

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

1299

- mc.current_server->last_seen.tv_sec);

1401

1300

waited_time.tv_nsec = (now.tv_nsec

1402

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

1301

- mc.current_server->last_seen.tv_nsec);

1403

1302

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

1404

1303

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

1405

1304

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

1408

1307

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

1409

1308

1410

1309

if (debug){

1411

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

1412

block_time);

1310

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

1413

1311

}

1414

1312

1415

1313

if(block_time <= 0){

1416

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

1417

mc->current_server->port,

1418

mc->current_server->if_index,

1419

mc->current_server->af, mc);

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1420

1318

if(ret == 0){

1421

avahi_simple_poll_quit(s);

1319

avahi_simple_poll_quit(mc.simple_poll);

1422

1320

return 0;

1423

1321

}

1424

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1425

&mc->current_server->last_seen);

1323

&mc.current_server->last_seen);

1426

1324

if(ret == -1){

1427

1325

perror_plus("clock_gettime");

1428

1326

return -1;

1429

1327

}

1430

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

1328

mc.current_server = mc.current_server->next;

1431

1329

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

1432

1330

servers, but don't block */

1433

1331

}

1435

1333

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

1436

1334

}

1437

1335

if(ret != 0){

1438

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

1336

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

1439

1337

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

1440

1338

}

1441

1339

}

1442

1340

}

1443

1341

}

1444

1342

1445

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

1446

error_t raise_privileges(void){

1447

error_t old_errno = errno;

1448

error_t ret_errno = 0;

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t raise_privileges_permanently(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = raise_privileges();

1461

if(ret_errno != 0){

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

error_t lower_privileges(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = 0;

1477

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

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

/* Lower privileges permanently */

1486

error_t lower_privileges_permanently(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("setuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

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

1498

const float delay){

1499

struct dirent **direntries;

1500

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

1501

alphasort);

1502

if(numhooks == -1){

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1510

}

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

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

1515

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

1516

direntry = direntries[i];

1517

char *fullname = NULL;

1518

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

1519

if(ret < 0){

1520

perror_plus("asprintf");

1521

continue;

1522

}

1523

if(debug){

1524

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

1525

direntry->d_name);

1526

}

1527

pid_t hook_pid = fork();

1528

if(hook_pid == 0){

1529

/* Child */

1530

/* Raise privileges */

1531

raise_privileges_permanently();

1532

/* Set group */

1533

errno = 0;

1534

ret = setgid(0);

1535

if(ret == -1){

1536

perror_plus("setgid");

1537

}

1538

/* Reset supplementary groups */

1539

errno = 0;

1540

ret = setgroups(0, NULL);

1541

if(ret == -1){

1542

perror_plus("setgroups");

1543

}

1544

dup2(devnull, STDIN_FILENO);

1545

close(devnull);

1546

dup2(STDERR_FILENO, STDOUT_FILENO);

1547

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

1548

if(ret == -1){

1549

perror_plus("setenv");

1550

_exit(EX_OSERR);

1551

}

1552

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

1553

if(ret == -1){

1554

perror_plus("setenv");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

perror_plus("setenv");

1560

_exit(EX_OSERR);

1561

}

1562

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

1563

if(ret == -1){

1564

perror_plus("setenv");

1565

_exit(EX_OSERR);

1566

}

1567

char *delaystring;

1568

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

1569

if(ret == -1){

1570

perror_plus("asprintf");

1571

_exit(EX_OSERR);

1572

}

1573

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

1574

if(ret == -1){

1575

free(delaystring);

1576

perror_plus("setenv");

1577

_exit(EX_OSERR);

1578

}

1579

free(delaystring);

1580

if(connect_to != NULL){

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

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

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1591

} else {

1592

int status;

1593

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

1594

perror_plus("waitpid");

1595

free(fullname);

1596

continue;

1597

}

1598

if(WIFEXITED(status)){

1599

if(WEXITSTATUS(status) != 0){

1600

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

1601

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

1602

WEXITSTATUS(status));

1603

free(fullname);

1604

continue;

1605

}

1606

} else if(WIFSIGNALED(status)){

1607

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

1608

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

1609

WTERMSIG(status));

1610

free(fullname);

1611

continue;

1612

} else {

1613

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

1614

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

1615

free(fullname);

1616

continue;

1617

}

1618

}

1619

free(fullname);

1620

if(debug){

1621

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

1622

direntry->d_name);

1623

}

1624

}

1625

close(devnull);

1626

}

1627

return true;

1628

}

1629

1630

error_t bring_up_interface(const char *const interface,

1631

const float delay){

1632

int sd = -1;

1633

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1636

struct ifreq network;

1637

unsigned int if_index = if_nametoindex(interface);

1638

if(if_index == 0){

1639

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

1640

errno = old_errno;

1641

return ENXIO;

1642

}

1643

1644

if(quit_now){

1645

errno = old_errno;

1646

return EINTR;

1647

}

1648

1649

if(not interface_is_up(interface)){

1650

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

1651

ret_errno = errno;

1652

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

1653

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

1654

return ret_errno;

1655

}

1656

network.ifr_flags |= IFF_UP;

1657

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1660

ret_errno = errno;

1661

perror_plus("socket");

1662

errno = old_errno;

1663

return ret_errno;

1664

}

1665

1666

if(quit_now){

1667

close(sd);

1668

errno = old_errno;

1669

return EINTR;

1670

}

1671

1672

if(debug){

1673

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

1674

interface);

1675

}

1676

1677

/* Raise priviliges */

1678

raise_privileges();

1679

1680

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

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

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1688

}

1689

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1692

#ifdef __linux__

1693

if(restore_loglevel){

1694

ret_linux = klogctl(7, NULL, 0);

1695

if(ret_linux == -1){

1696

perror_plus("klogctl");

1697

}

1698

}

1699

#endif /* __linux__ */

1700

1701

/* Lower privileges */

1702

lower_privileges();

1703

1704

/* Close the socket */

1705

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

1706

if(ret == -1){

1707

perror_plus("close");

1708

}

1709

1710

if(ret_setflags == -1){

1711

errno = ret_errno;

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1713

errno = old_errno;

1714

return ret_errno;

1715

}

1716

} else if(debug){

1717

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

1718

interface);

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

if(interface_is_running(interface)){

1725

break;

1726

}

1727

struct timespec sleeptime = { .tv_nsec = 250000000 };

1728

ret = nanosleep(&sleeptime, NULL);

1729

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

1730

perror_plus("nanosleep");

1731

}

1732

}

1733

1734

errno = old_errno;

1735

return 0;

1736

}

1737

1738

error_t take_down_interface(const char *const interface){

1739

error_t old_errno = errno;

1740

struct ifreq network;

1741

unsigned int if_index = if_nametoindex(interface);

1742

if(if_index == 0){

1743

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

1744

errno = old_errno;

1745

return ENXIO;

1746

}

1747

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1749

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

1750

ret_errno = errno;

1751

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

1752

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

1753

return ret_errno;

1754

}

1755

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

1756

1757

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

1758

if(sd < 0){

1759

ret_errno = errno;

1760

perror_plus("socket");

1761

errno = old_errno;

1762

return ret_errno;

1763

}

1764

1765

if(debug){

1766

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

1767

interface);

1768

}

1769

1770

/* Raise priviliges */

1771

raise_privileges();

1772

1773

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

1774

ret_errno = errno;

1775

1776

/* Lower privileges */

1777

lower_privileges();

1778

1779

/* Close the socket */

1780

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

1781

if(ret == -1){

1782

perror_plus("close");

1783

}

1784

1785

if(ret_setflags == -1){

1786

errno = ret_errno;

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

errno = old_errno;

1789

return ret_errno;

1790

}

1791

} else if(debug){

1792

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

1793

interface);

1794

}

1795

1796

errno = old_errno;

1797

return 0;

1798

}

1799

1800

1343

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

1801

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

1802

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

1803

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

1804

.interfaces = NULL, .interfaces_size = 0 };

1805

1344

AvahiSServiceBrowser *sb = NULL;

1806

error_t ret_errno;

1345

int error;

1807

1346

int ret;

1808

1347

intmax_t tmpmax;

1809

1348

char *tmp;

1810

1349

int exitcode = EXIT_SUCCESS;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1813

1356

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

1814

1357

bool tempdir_created = false;

1815

1358

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1816

1359

const char *seckey = PATHDIR "/" SECKEY;

1817

1360

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1819

1361

1820

1362

bool gnutls_initialized = false;

1821

1363

bool gpgme_initialized = false;

1883

1425

.group = 2 },

1884

1426

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

1885

1427

.arg = "SECONDS",

1886

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

1887

.group = 2 },

1888

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

1889

.arg = "DIR",

1890

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

1428

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

1891

1429

.group = 2 },

1892

1430

/*

1893

1431

* These reproduce what we would get without ARGP_NO_HELP

1912

1450

connect_to = arg;

1913

1451

break;

1914

1452

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

1915

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

1916

arg, (int)',');

1917

if(ret_errno != 0){

1918

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

1919

}

1453

interface = arg;

1920

1454

break;

1921

1455

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

1922

1456

seckey = arg;

1951

1485

argp_error(state, "Bad retry interval");

1952

1486

}

1953

1487

break;

1954

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

1955

hookdir = arg;

1956

break;

1957

1488

/*

1958

1489

* These reproduce what we would get without ARGP_NO_HELP

1959

1490

*/

1965

1496

argp_state_help(state, state->out_stream,

1966

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1967

1498

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

1968

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

1499

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

1969

1500

exit(argp_err_exit_status);

1970

1501

break;

1971

1502

default:

1998

1529

{

1999

1530

/* Work around Debian bug #633582:

2000

1531

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

1532

struct stat st;

2001

1533

2002

1534

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2004

struct stat st;

2005

2006

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

2007

int seckey_fd = open(seckey, O_RDONLY);

2008

if(seckey_fd == -1){

2009

perror_plus("open");

2010

} else {

2011

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

2012

if(ret == -1){

2013

perror_plus("fstat");

2014

} else {

2015

if(S_ISREG(st.st_mode)

2016

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

2017

ret = fchown(seckey_fd, uid, gid);

2018

if(ret == -1){

2019

perror_plus("fchown");

2020

}

2021

}

2022

}

2023

TEMP_FAILURE_RETRY(close(seckey_fd));

2024

}

2025

}

2026

2027

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

2028

int pubkey_fd = open(pubkey, O_RDONLY);

2029

if(pubkey_fd == -1){

2030

perror_plus("open");

2031

} else {

2032

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

2033

if(ret == -1){

2034

perror_plus("fstat");

2035

} else {

2036

if(S_ISREG(st.st_mode)

2037

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

2038

ret = fchown(pubkey_fd, uid, gid);

2039

if(ret == -1){

2040

perror_plus("fchown");

2041

}

2042

}

2043

}

2044

TEMP_FAILURE_RETRY(close(pubkey_fd));

2045

}

2046

}

2047

2048

/* Lower privileges */

2049

lower_privileges();

2050

}

2051

}

2052

2053

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

2054

{

2055

char *interface = NULL;

2056

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

2057

interface))){

2058

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

2059

and if_nametoindex(interface) == 0){

2060

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

2061

fprintf_plus(stderr, "Not using nonexisting interface"

2062

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

2063

}

2064

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

2065

interface = NULL;

2066

}

2067

}

2068

}

2069

2070

/* Run network hooks */

2071

{

2072

if(mc.interfaces != NULL){

2073

interfaces_hooks = malloc(mc.interfaces_size);

2074

if(interfaces_hooks == NULL){

2075

perror_plus("malloc");

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

ret = execl(fullname, direntry->d_name, "start", NULL);

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

2076

1644

goto end;

2077

1645

}

2078

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

2079

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

2080

}

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

1646

}

1647

close(devnull);

2085

1648

}

2086

1649

2087

1650

if(not debug){

2088

1651

avahi_set_log_function(empty_log);

2089

1652

}

2090

1653

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

/* No up interfaces, look for any good interfaces */

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

2091

1686

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

2092

1687

from the signal handler */

2093

1688

/* Initialize the pseudo-RNG for Avahi */

2094

1689

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

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

2097

fprintf_plus(stderr,

2098

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

1690

mc.simple_poll = avahi_simple_poll_new();

1691

if(mc.simple_poll == NULL){

1692

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

2099

1693

exitcode = EX_UNAVAILABLE;

2100

1694

goto end;

2101

1695

}

2163

1757

}

2164

1758

}

2165

1759

2166

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

2167

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2169

/* Look for any good interfaces */

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2171

alphasort);

2172

if(ret >= 1){

2173

/* Add all found interfaces to interfaces list */

2174

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

2175

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

2176

direntries[i]->d_name);

2177

if(ret_errno != 0){

2178

errno = ret_errno;

2179

perror_plus("argz_add");

2180

continue;

2181

}

2182

if(debug){

2183

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

2184

direntries[i]->d_name);

2185

}

2186

}

2187

free(direntries);

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

1845

}

1846

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

1864

break;

1865

}

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

2188

1896

} else {

2189

free(direntries);

2190

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

2191

exitcode = EXIT_FAILURE;

2192

goto end;

2193

}

2194

}

2195

2196

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

2197

{

2198

char *interface = NULL;

2199

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

2200

interface))){

2201

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

2202

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

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

while((interface = argz_next(mc.interfaces,

2208

mc.interfaces_size, interface))){

2209

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

2210

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

2211

interface);

2212

interface = NULL;

2213

}

2214

}

2215

break;

2216

}

2217

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2219

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2222

perror_plus("Failed to bring up interface");

2223

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2229

perror_plus("argz_add");

2230

}

2231

}

2232

}

2233

}

2234

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

2235

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

2236

}

2237

}

2238

2239

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

2240

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

2241

if(debug){

2242

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

2243

mc.interfaces);

2244

}

2245

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

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

2246

1903

}

2247

1904

2248

1905

if(quit_now){

2249

1906

goto end;

2250

1907

}

2251

1908

2252

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

1909

ret = init_gnutls_global(pubkey, seckey);

2253

1910

if(ret == -1){

2254

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

1911

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

2255

1912

exitcode = EX_UNAVAILABLE;

2256

1913

goto end;

2257

1914

} else {

2272

1929

goto end;

2273

1930

}

2274

1931

2275

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

2276

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

1932

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

1933

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

2277

1934

exitcode = EX_UNAVAILABLE;

2278

1935

goto end;

2279

1936

} else {

2288

1945

/* Connect directly, do not use Zeroconf */

2289

1946

/* (Mainly meant for debugging) */

2290

1947

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

2291

2292

1948

if(address == NULL){

2293

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

1949

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

2294

1950

exitcode = EX_USAGE;

2295

1951

goto end;

2296

1952

}

2299

1955

goto end;

2300

1956

}

2301

1957

2302

in_port_t port;

1958

uint16_t port;

2303

1959

errno = 0;

2304

1960

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

2305

1961

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

2306

or tmpmax != (in_port_t)tmpmax){

2307

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

1962

or tmpmax != (uint16_t)tmpmax){

1963

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

2308

1964

exitcode = EX_USAGE;

2309

1965

goto end;

2310

1966

}

2311

1967

2312

1968

if(quit_now){

2313

1969

goto end;

2314

1970

}

2315

1971

2316

port = (in_port_t)tmpmax;

1972

port = (uint16_t)tmpmax;

2317

1973

*address = '\0';

2318

1974

/* Colon in address indicates IPv6 */

2319

1975

int af;

2335

1991

}

2336

1992

2337

1993

while(not quit_now){

2338

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

2339

&mc);

1994

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

2340

1995

if(quit_now or ret == 0){

2341

1996

break;

2342

1997

}

2343

1998

if(debug){

2344

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

2345

(int)retry_interval);

1999

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

2000

(int)retry_interval);

2346

2001

}

2347

sleep((unsigned int)retry_interval);

2002

sleep((int)retry_interval);

2348

2003

}

2349

2004

2350

2005

if (not quit_now){

2368

2023

config.publish_domain = 0;

2369

2024

2370

2025

/* Allocate a new server */

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

2026

mc.server = avahi_server_new(avahi_simple_poll_get

2027

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2373

2029

2374

2030

/* Free the Avahi configuration data */

2375

2031

avahi_server_config_free(&config);

2377

2033

2378

2034

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

2379

2035

if(mc.server == NULL){

2380

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

2381

avahi_strerror(ret_errno));

2036

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

2037

avahi_strerror(error));

2382

2038

exitcode = EX_UNAVAILABLE;

2383

2039

goto end;

2384

2040

}

2390

2046

/* Create the Avahi service browser */

2391

2047

sb = avahi_s_service_browser_new(mc.server, if_index,

2392

2048

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

2049

NULL, 0, browse_callback, NULL);

2395

2050

if(sb == NULL){

2396

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

2397

avahi_strerror(avahi_server_errno(mc.server)));

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2398

2053

exitcode = EX_UNAVAILABLE;

2399

2054

goto end;

2400

2055

}

2406

2061

/* Run the main loop */

2407

2062

2408

2063

if(debug){

2409

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

2064

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

2410

2065

}

2411

2066

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2414

2069

if(debug){

2415

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

2416

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

2070

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

2071

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

2417

2072

}

2418

2073

2419

2074

end:

2420

2075

2421

2076

if(debug){

2422

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

2077

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

2423

2078

}

2424

2079

2425

2080

/* Cleanup things */

2426

free(mc.interfaces);

2427

2428

2081

if(sb != NULL)

2429

2082

avahi_s_service_browser_free(sb);

2430

2083

2431

2084

if(mc.server != NULL)

2432

2085

avahi_server_free(mc.server);

2433

2086

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

2087

if(mc.simple_poll != NULL)

2088

avahi_simple_poll_free(mc.simple_poll);

2436

2089

2437

2090

if(gnutls_initialized){

2438

2091

gnutls_certificate_free_credentials(mc.cred);

2443

2096

if(gpgme_initialized){

2444

2097

gpgme_release(mc.ctx);

2445

2098

}

2446

2099

2447

2100

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

2448

2101

has seen */

2449

2102

if(mc.current_server != NULL){

2455

2108

}

2456

2109

}

2457

2110

2458

/* Re-raise priviliges */

2459

{

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2111

/* XXX run network hooks "stop" here */

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2120

}

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2476

2130

}

2477

2131

}

2478

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

2479

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

2480

" down\n");

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2481

2141

}

2482

2142

}

2483

2484

lower_privileges_permanently();

2485

2143

}

2486

2144

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2489

2490

2145

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

2491

2146

if(tempdir_created){

2492

2147

struct dirent **direntries = NULL;

2505

2160

}

2506

2161

ret = remove(fullname);

2507

2162

if(ret == -1){

2508

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

2509

strerror(errno));

2163

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

2164

strerror(errno));

2510

2165

}

2511

2166

free(fullname);

2512

2167

}