/mandos/release : revision 237.14.3

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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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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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#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), nonnull))

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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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__attribute__((nonnull, warn_unused_result))

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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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__attribute__((nonnull, warn_unused_result))

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

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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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__attribute__((nonnull, warn_unused_result))

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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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336

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/* Create new GPGME "context" */

337

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

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

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if(rc != GPG_ERR_NO_ERROR){

339

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));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

344

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* Decrypt OpenPGP data.

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* Returns -1 on error

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*/

356

__attribute__((nonnull, warn_unused_result))

357

325

static ssize_t pgp_packet_decrypt(const char *cryptotext,

358

326

size_t crypto_size,

359

char **plaintext,

360

mandos_context *mc){

327

char **plaintext){

361

328

gpgme_data_t dh_crypto, dh_plain;

362

329

gpgme_error_t rc;

363

330

ssize_t ret;

365

332

ssize_t plaintext_length = 0;

366

333

367

334

if(debug){

368

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

335

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

369

336

}

370

337

371

338

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

372

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

373

340

0);

374

341

if(rc != GPG_ERR_NO_ERROR){

375

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

376

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));

377

344

return -1;

378

345

}

379

346

380

347

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

381

348

rc = gpgme_data_new(&dh_plain);

382

349

if(rc != GPG_ERR_NO_ERROR){

383

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

384

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

385

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

386

352

gpgme_data_release(dh_crypto);

387

353

return -1;

388

354

}

389

355

390

356

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

391

357

data buffer */

392

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

358

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

393

359

if(rc != GPG_ERR_NO_ERROR){

394

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

395

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

396

362

plaintext_length = -1;

397

363

if(debug){

398

364

gpgme_decrypt_result_t result;

399

result = gpgme_op_decrypt_result(mc->ctx);

365

result = gpgme_op_decrypt_result(mc.ctx);

400

366

if(result == NULL){

401

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

367

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

402

368

} else {

403

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

404

result->unsupported_algorithm);

405

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

406

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);

407

373

if(result->file_name != NULL){

408

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

374

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

409

375

}

410

376

gpgme_recipient_t recipient;

411

377

recipient = result->recipients;

412

378

while(recipient != NULL){

413

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

414

gpgme_pubkey_algo_name

415

(recipient->pubkey_algo));

416

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

417

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

418

recipient->status == GPG_ERR_NO_SECKEY

419

? "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");

420

385

recipient = recipient->next;

421

386

}

422

387

}

425

390

}

426

391

427

392

if(debug){

428

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

393

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

429

394

}

430

395

431

396

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

438

403

*plaintext = NULL;

439

404

while(true){

440

405

plaintext_capacity = incbuffer(plaintext,

441

(size_t)plaintext_length,

442

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

443

408

if(plaintext_capacity == 0){

444

perror_plus("incbuffer");

445

plaintext_length = -1;

446

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

447

412

}

448

413

449

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

462

427

}

463

428

464

429

if(debug){

465

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

430

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

466

431

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

467

432

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

468

433

}

479

444

return plaintext_length;

480

445

}

481

446

482

__attribute__((warn_unused_result))

483

static const char *safer_gnutls_strerror(int value){

484

const char *ret = gnutls_strerror(value);

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

485

450

if(ret == NULL)

486

451

ret = "(unknown)";

487

452

return ret;

488

453

}

489

454

490

455

/* GnuTLS log function callback */

491

__attribute__((nonnull))

492

456

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

493

457

const char* string){

494

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

458

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

495

459

}

496

460

497

__attribute__((nonnull, warn_unused_result))

498

461

static int init_gnutls_global(const char *pubkeyfilename,

499

const char *seckeyfilename,

500

mandos_context *mc){

462

const char *seckeyfilename){

501

463

int ret;

502

464

503

465

if(debug){

504

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

466

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

505

467

}

506

468

507

469

ret = gnutls_global_init();

508

470

if(ret != GNUTLS_E_SUCCESS){

509

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

510

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

511

473

return -1;

512

474

}

513

475

520

482

}

521

483

522

484

/* OpenPGP credentials */

523

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

524

486

if(ret != GNUTLS_E_SUCCESS){

525

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

526

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

527

489

gnutls_global_deinit();

528

490

return -1;

529

491

}

530

492

531

493

if(debug){

532

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

533

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

534

pubkeyfilename,

535

seckeyfilename);

494

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

495

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

496

seckeyfilename);

536

497

}

537

498

538

499

ret = gnutls_certificate_set_openpgp_key_file

539

(mc->cred, pubkeyfilename, seckeyfilename,

500

(mc.cred, pubkeyfilename, seckeyfilename,

540

501

GNUTLS_OPENPGP_FMT_BASE64);

541

502

if(ret != GNUTLS_E_SUCCESS){

542

fprintf_plus(stderr,

543

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

544

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

545

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

546

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));

547

508

goto globalfail;

548

509

}

549

510

550

511

/* GnuTLS server initialization */

551

ret = gnutls_dh_params_init(&mc->dh_params);

512

ret = gnutls_dh_params_init(&mc.dh_params);

552

513

if(ret != GNUTLS_E_SUCCESS){

553

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

554

" initialization: %s\n",

555

safer_gnutls_strerror(ret));

514

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

515

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

556

516

goto globalfail;

557

517

}

558

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

518

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

559

519

if(ret != GNUTLS_E_SUCCESS){

560

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

561

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

562

522

goto globalfail;

563

523

}

564

524

565

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

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

566

526

567

527

return 0;

568

528

569

529

globalfail:

570

530

571

gnutls_certificate_free_credentials(mc->cred);

531

gnutls_certificate_free_credentials(mc.cred);

572

532

gnutls_global_deinit();

573

gnutls_dh_params_deinit(mc->dh_params);

533

gnutls_dh_params_deinit(mc.dh_params);

574

534

return -1;

575

535

}

576

536

577

__attribute__((nonnull, warn_unused_result))

578

static int init_gnutls_session(gnutls_session_t *session,

579

mandos_context *mc){

537

static int init_gnutls_session(gnutls_session_t *session){

580

538

int ret;

581

539

/* GnuTLS session creation */

582

540

do {

586

544

}

587

545

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

588

546

if(ret != GNUTLS_E_SUCCESS){

589

fprintf_plus(stderr,

590

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

591

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

592

549

}

593

550

594

551

{

595

552

const char *err;

596

553

do {

597

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

554

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

598

555

if(quit_now){

599

556

gnutls_deinit(*session);

600

557

return -1;

601

558

}

602

559

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

603

560

if(ret != GNUTLS_E_SUCCESS){

604

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

605

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

606

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));

607

564

gnutls_deinit(*session);

608

565

return -1;

609

566

}

611

568

612

569

do {

613

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

614

mc->cred);

571

mc.cred);

615

572

if(quit_now){

616

573

gnutls_deinit(*session);

617

574

return -1;

618

575

}

619

576

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

620

577

if(ret != GNUTLS_E_SUCCESS){

621

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

622

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

623

580

gnutls_deinit(*session);

624

581

return -1;

625

582

}

627

584

/* ignore client certificate if any. */

628

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

629

586

630

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

631

588

632

589

return 0;

633

590

}

637

594

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

638

595

639

596

/* Called when a Mandos server is found */

640

__attribute__((nonnull, warn_unused_result))

641

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

597

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

642

598

AvahiIfIndex if_index,

643

int af, mandos_context *mc){

599

int af){

644

600

int ret, tcp_sd = -1;

645

601

ssize_t sret;

646

struct sockaddr_storage to;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

647

606

char *buffer = NULL;

648

607

char *decrypted_buffer = NULL;

649

608

size_t buffer_length = 0;

668

627

pf = PF_INET;

669

628

break;

670

629

default:

671

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

630

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

672

631

errno = EINVAL;

673

632

return -1;

674

633

}

675

634

676

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

677

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

678

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

679

bool match = false;

680

{

681

char *interface = NULL;

682

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

683

interface))){

684

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

685

match = true;

686

break;

687

}

688

}

689

}

690

if(not match){

691

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

692

connect to the server */

693

if(debug){

694

char interface[IF_NAMESIZE];

695

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

696

perror_plus("if_indextoname");

697

} else {

698

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

699

" \"%s\"\n",

700

if_indextoname((unsigned int)if_index,

701

interface));

702

}

703

}

704

return -1;

705

}

706

}

707

708

ret = init_gnutls_session(&session, mc);

635

ret = init_gnutls_session(&session);

709

636

if(ret != 0){

710

637

return -1;

711

638

}

712

639

713

640

if(debug){

714

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

715

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

641

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

642

"\n", ip, port);

716

643

}

717

644

718

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

730

657

731

658

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

732

659

if(af == AF_INET6){

733

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

734

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

660

to.in6.sin6_family = (sa_family_t)af;

661

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

735

662

} else { /* IPv4 */

736

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

737

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

663

to.in.sin_family = (sa_family_t)af;

664

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

738

665

}

739

666

if(ret < 0 ){

740

667

int e = errno;

744

671

}

745

672

if(ret == 0){

746

673

int e = errno;

747

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

674

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

748

675

errno = e;

749

676

goto mandos_end;

750

677

}

751

678

if(af == AF_INET6){

752

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

753

if(IN6_IS_ADDR_LINKLOCAL

754

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

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

755

686

if(if_index == AVAHI_IF_UNSPEC){

756

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

757

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

758

689

errno = EINVAL;

759

690

goto mandos_end;

760

691

}

761

692

/* Set the network interface number as scope */

762

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

693

to.in6.sin6_scope_id = (uint32_t)if_index;

763

694

}

764

695

} else {

765

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

696

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

697

-Wconversion and

698

-Wunreachable-code */

766

699

}

767

700

768

701

if(quit_now){

776

709

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

777

710

perror_plus("if_indextoname");

778

711

} else {

779

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

780

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

712

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

713

ip, interface, port);

781

714

}

782

715

} else {

783

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

784

ip, (uintmax_t)port);

716

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

717

port);

785

718

}

786

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

787

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

721

const char *pcret;

788

722

if(af == AF_INET6){

789

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

790

sizeof(struct sockaddr_in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

723

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

724

sizeof(addrstr));

793

725

} else {

794

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

795

sizeof(struct sockaddr_in),

796

addrstr, sizeof(addrstr), NULL, 0,

797

NI_NUMERICHOST);

726

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

727

sizeof(addrstr));

798

728

}

799

if(ret == EAI_SYSTEM){

800

perror_plus("getnameinfo");

801

} else if(ret != 0) {

802

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

803

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

804

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

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

805

735

}

806

736

}

807

737

811

741

}

812

742

813

743

if(af == AF_INET6){

814

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

815

sizeof(struct sockaddr_in6));

744

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

816

745

} else {

817

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

818

sizeof(struct sockaddr_in));

746

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

819

747

}

820

748

if(ret < 0){

821

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

749

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

822

750

int e = errno;

823

751

perror_plus("connect");

824

752

errno = e;

836

764

while(true){

837

765

size_t out_size = strlen(out);

838

766

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

839

out_size - written));

767

out_size - written));

840

768

if(ret == -1){

841

769

int e = errno;

842

770

perror_plus("write");

862

790

}

863

791

864

792

if(debug){

865

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

793

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

866

794

}

867

795

868

796

if(quit_now){

870

798

goto mandos_end;

871

799

}

872

800

873

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

874

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

875

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

876

gnutls_transport_set_ptr(session,

877

(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);

878

803

879

804

if(quit_now){

880

805

errno = EINTR;

891

816

892

817

if(ret != GNUTLS_E_SUCCESS){

893

818

if(debug){

894

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

819

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

895

820

gnutls_perror(ret);

896

821

}

897

822

errno = EPROTO;

901

826

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

902

827

903

828

if(debug){

904

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

905

" %s\n", ip);

829

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

830

ip);

906

831

}

907

832

908

833

while(true){

913

838

}

914

839

915

840

buffer_capacity = incbuffer(&buffer, buffer_length,

916

buffer_capacity);

841

buffer_capacity);

917

842

if(buffer_capacity == 0){

918

843

int e = errno;

919

844

perror_plus("incbuffer");

946

871

}

947

872

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

948

873

if(ret < 0){

949

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

950

"***\n");

874

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

951

875

gnutls_perror(ret);

952

876

errno = EPROTO;

953

877

goto mandos_end;

954

878

}

955

879

break;

956

880

default:

957

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

958

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

959

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

960

884

errno = EIO;

961

885

goto mandos_end;

966

890

}

967

891

968

892

if(debug){

969

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

893

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

970

894

}

971

895

972

896

if(quit_now){

984

908

985

909

if(buffer_length > 0){

986

910

ssize_t decrypted_buffer_size;

987

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

988

&decrypted_buffer, mc);

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

989

914

if(decrypted_buffer_size >= 0){

990

915

991

916

written = 0;

1001

926

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

1002

927

int e = errno;

1003

928

if(debug){

1004

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

1005

strerror(errno));

929

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

930

strerror(errno));

1006

931

}

1007

932

errno = e;

1008

933

goto mandos_end;

1039

964

return retval;

1040

965

}

1041

966

1042

__attribute__((nonnull))

1043

967

static void resolve_callback(AvahiSServiceResolver *r,

1044

968

AvahiIfIndex interface,

1045

969

AvahiProtocol proto,

1053

977

AVAHI_GCC_UNUSED AvahiStringList *txt,

1054

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

979

flags,

1056

void *mc){

1057

if(r == NULL){

1058

return;

1059

}

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1060

982

1061

983

/* Called whenever a service has been resolved successfully or

1062

984

timed out */

1068

990

switch(event){

1069

991

default:

1070

992

case AVAHI_RESOLVER_FAILURE:

1071

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

1072

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

1073

domain,

1074

avahi_strerror(avahi_server_errno

1075

(((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)));

1076

996

break;

1077

997

1078

998

case AVAHI_RESOLVER_FOUND:

1080

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1081

1001

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

1082

1002

if(debug){

1083

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

1084

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

1085

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);

1086

1006

}

1087

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

1088

interface,

1089

avahi_proto_to_af(proto),

1090

mc);

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1091

1009

if(ret == 0){

1092

avahi_simple_poll_quit(simple_poll);

1010

avahi_simple_poll_quit(mc.simple_poll);

1093

1011

} else {

1094

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

1095

avahi_proto_to_af(proto),

1096

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

1097

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

1098

" list\n", name);

1099

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1100

1014

}

1101

1015

}

1102

1016

}

1112

1026

const char *domain,

1113

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1114

1028

flags,

1115

void *mc){

1116

if(b == NULL){

1117

return;

1118

}

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1119

1031

1120

1032

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

1121

1033

is removed from the LAN */

1128

1040

default:

1129

1041

case AVAHI_BROWSER_FAILURE:

1130

1042

1131

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

1132

avahi_strerror(avahi_server_errno

1133

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

1134

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);

1135

1046

return;

1136

1047

1137

1048

case AVAHI_BROWSER_NEW:

1140

1051

the callback function is called the Avahi server will free the

1141

1052

resolver for us. */

1142

1053

1143

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

1144

interface, protocol, name, type,

1145

domain, protocol, 0,

1146

resolve_callback, mc) == NULL)

1147

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

1148

" %s\n", name,

1149

avahi_strerror(avahi_server_errno

1150

(((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)));

1151

1059

break;

1152

1060

1153

1061

case AVAHI_BROWSER_REMOVE:

1156

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1157

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1158

1066

if(debug){

1159

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

1160

" searching...\n");

1067

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

1161

1068

}

1162

1069

break;

1163

1070

}

1172

1079

signal_received = sig;

1173

1080

int old_errno = errno;

1174

1081

/* set main loop to exit */

1175

if(simple_poll != NULL){

1176

avahi_simple_poll_quit(simple_poll);

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1177

1084

}

1178

1085

errno = old_errno;

1179

1086

}

1180

1087

1181

__attribute__((nonnull, warn_unused_result))

1182

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

1183

int ret;

1184

error_t ret_errno;

1185

1186

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

1187

if(s < 0){

1188

ret_errno = errno;

1189

perror_plus("socket");

1190

errno = ret_errno;

1191

return false;

1192

}

1193

strcpy(ifr->ifr_name, ifname);

1194

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1195

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){

1196

1144

if(debug){

1197

ret_errno = errno;

1198

perror_plus("ioctl SIOCGIFFLAGS");

1199

errno = ret_errno;

1145

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

1146

flagstring, if_entry->d_name);

1200

1147

}

1201

return false;

1148

free(flagstring);

1149

return 0;

1202

1150

}

1203

return true;

1204

}

1205

1206

__attribute__((nonnull, warn_unused_result))

1207

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

1208

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1209

1153

/* Reject the loopback device */

1210

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1211

1155

if(debug){

1212

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

1213

ifname);

1156

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

1157

if_entry->d_name);

1214

1158

}

1215

return false;

1159

return 0;

1216

1160

}

1217

1161

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

1218

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

1162

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

1219

1163

if(debug){

1220

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

1221

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

1164

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

1165

if_entry->d_name);

1222

1166

}

1223

return true;

1167

return 1;

1224

1168

}

1225

1169

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

1226

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

1170

if(not (flags & IFF_BROADCAST)){

1227

1171

if(debug){

1228

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1229

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

1172

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

1173

if_entry->d_name);

1230

1174

}

1231

return false;

1175

return 0;

1232

1176

}

1233

1177

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

1234

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1235

1179

if(debug){

1236

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

1237

ifname);

1180

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

1181

if_entry->d_name);

1238

1182

}

1239

return false;

1183

return 0;

1240

1184

}

1241

1242

1185

/* Accept this device */

1243

1186

if(debug){

1244

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

1245

}

1246

return true;

1247

}

1248

1249

/*

1250

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

1251

* corresponds to an acceptable network device.

1252

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

1253

*/

1254

__attribute__((nonnull, warn_unused_result))

1255

int good_interface(const struct dirent *if_entry){

1256

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

1257

return 0;

1258

}

1259

1260

struct ifreq ifr;

1261

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

1262

if(debug){

1263

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

1264

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

1265

}

1266

return 0;

1267

}

1268

1269

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

1270

return 0;

1187

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

1188

if_entry->d_name);

1271

1189

}

1272

1190

return 1;

1273

1191

}

1274

1192

1275

/*

1276

* This function determines if a network interface is up.

1277

*/

1278

__attribute__((nonnull, warn_unused_result))

1279

bool interface_is_up(const char *interface){

1280

struct ifreq ifr;

1281

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

1282

if(debug){

1283

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

1284

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

1285

}

1286

return false;

1287

}

1288

1289

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

1290

}

1291

1292

/*

1293

* This function determines if a network interface is running

1294

*/

1295

__attribute__((nonnull, warn_unused_result))

1296

bool interface_is_running(const char *interface){

1297

struct ifreq ifr;

1298

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

1299

if(debug){

1300

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

1301

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

1302

}

1303

return false;

1304

}

1305

1306

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

1307

}

1308

1309

__attribute__((nonnull, pure, warn_unused_result))

1310

1193

int notdotentries(const struct dirent *direntry){

1311

1194

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

1312

1195

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

1318

1201

return 1;

1319

1202

}

1320

1203

1321

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

1322

__attribute__((nonnull, warn_unused_result))

1323

int runnable_hook(const struct dirent *direntry){

1324

int ret;

1325

size_t sret;

1326

struct stat st;

1327

1328

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

1329

/* Empty name? */

1330

return 0;

1331

}

1332

1333

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

1334

"abcdefghijklmnopqrstuvwxyz"

1335

"0123456789"

1336

"_-");

1337

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

1338

/* Contains non-allowed characters */

1339

if(debug){

1340

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

1341

direntry->d_name);

1342

}

1343

return 0;

1344

}

1345

1346

char *fullname = NULL;

1347

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

1348

if(ret < 0){

1349

perror_plus("asprintf");

1350

return 0;

1351

}

1352

1353

ret = stat(fullname, &st);

1354

if(ret == -1){

1355

if(debug){

1356

perror_plus("Could not stat hook");

1357

}

1358

return 0;

1359

}

1360

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

1361

/* Not a regular file */

1362

if(debug){

1363

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

1364

direntry->d_name);

1365

}

1366

return 0;

1367

}

1368

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

1369

/* Not executable */

1370

if(debug){

1371

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

1372

direntry->d_name);

1373

}

1374

return 0;

1375

}

1376

if(debug){

1377

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

1378

direntry->d_name);

1379

}

1380

return 1;

1381

}

1382

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

1205

int ret;

1387

1206

struct timespec now;

1388

1207

struct timespec waited_time;

1389

1208

intmax_t block_time;

1390

1209

1391

1210

while(true){

1392

if(mc->current_server == NULL){

1393

if(debug){

1394

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

1395

" No timeout!\n");

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1396

1215

}

1397

1216

ret = avahi_simple_poll_iterate(s, -1);

1398

1217

} else {

1399

if(debug){

1400

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

1401

" it, or wait\n");

1218

if (debug){

1219

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

1220

" or wait\n");

1402

1221

}

1403

1222

/* the current time */

1404

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1409

1228

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

1410

1229

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

1411

1230

waited_time.tv_sec = (now.tv_sec

1412

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

1231

- mc.current_server->last_seen.tv_sec);

1413

1232

waited_time.tv_nsec = (now.tv_nsec

1414

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

1233

- mc.current_server->last_seen.tv_nsec);

1415

1234

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

1416

1235

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

1417

1236

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

1419

1238

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

1420

1239

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

1421

1240

1422

if(debug){

1423

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

1424

block_time);

1241

if (debug){

1242

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

1425

1243

}

1426

1244

1427

1245

if(block_time <= 0){

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

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);

1432

1250

if(ret == 0){

1433

avahi_simple_poll_quit(s);

1251

avahi_simple_poll_quit(mc.simple_poll);

1434

1252

return 0;

1435

1253

}

1436

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1437

&mc->current_server->last_seen);

1255

&mc.current_server->last_seen);

1438

1256

if(ret == -1){

1439

1257

perror_plus("clock_gettime");

1440

1258

return -1;

1441

1259

}

1442

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

1260

mc.current_server = mc.current_server->next;

1443

1261

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

1444

1262

servers, but don't block */

1445

1263

}

1447

1265

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

1448

1266

}

1449

1267

if(ret != 0){

1450

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

1268

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

1451

1269

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

1452

1270

}

1453

1271

}

1454

1272

}

1455

1273

}

1456

1274

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

perror_plus("seteuid");

1465

}

1466

errno = old_errno;

1467

return ret_errno;

1468

}

1469

1470

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

1471

__attribute__((warn_unused_result))

1472

error_t raise_privileges_permanently(void){

1473

error_t old_errno = errno;

1474

error_t ret_errno = raise_privileges();

1475

if(ret_errno != 0){

1476

errno = old_errno;

1477

return ret_errno;

1478

}

1479

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

1480

ret_errno = errno;

1481

perror_plus("seteuid");

1482

}

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

1487

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

1488

__attribute__((warn_unused_result))

1489

error_t lower_privileges(void){

1490

error_t old_errno = errno;

1491

error_t ret_errno = 0;

1492

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

1493

ret_errno = errno;

1494

perror_plus("seteuid");

1495

}

1496

errno = old_errno;

1497

return ret_errno;

1498

}

1499

1500

/* Lower privileges permanently */

1501

__attribute__((warn_unused_result))

1502

error_t lower_privileges_permanently(void){

1503

error_t old_errno = errno;

1504

error_t ret_errno = 0;

1505

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

1506

ret_errno = errno;

1507

perror_plus("setuid");

1508

}

1509

errno = old_errno;

1510

return ret_errno;

1511

}

1512

1513

__attribute__((nonnull))

1514

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

1515

const float delay){

1516

struct dirent **direntries;

1517

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

1518

alphasort);

1519

if(numhooks == -1){

1520

if(errno == ENOENT){

1521

if(debug){

1522

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

1523

" found\n", hookdir);

1524

}

1525

} else {

1526

perror_plus("scandir");

1527

}

1528

} else {

1529

struct dirent *direntry;

1530

int ret;

1531

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

1532

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

1533

direntry = direntries[i];

1534

char *fullname = NULL;

1535

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

1536

if(ret < 0){

1537

perror_plus("asprintf");

1538

continue;

1539

}

1540

if(debug){

1541

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

1542

direntry->d_name);

1543

}

1544

pid_t hook_pid = fork();

1545

if(hook_pid == 0){

1546

/* Child */

1547

/* Raise privileges */

1548

if(raise_privileges_permanently() != 0){

1549

perror_plus("Failed to raise privileges");

1550

_exit(EX_NOPERM);

1551

}

1552

/* Set group */

1553

errno = 0;

1554

ret = setgid(0);

1555

if(ret == -1){

1556

perror_plus("setgid");

1557

_exit(EX_NOPERM);

1558

}

1559

/* Reset supplementary groups */

1560

errno = 0;

1561

ret = setgroups(0, NULL);

1562

if(ret == -1){

1563

perror_plus("setgroups");

1564

_exit(EX_NOPERM);

1565

}

1566

ret = dup2(devnull, STDIN_FILENO);

1567

if(ret == -1){

1568

perror_plus("dup2(devnull, STDIN_FILENO)");

1569

_exit(EX_OSERR);

1570

}

1571

ret = close(devnull);

1572

if(ret == -1){

1573

perror_plus("close");

1574

_exit(EX_OSERR);

1575

}

1576

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1577

if(ret == -1){

1578

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1579

_exit(EX_OSERR);

1580

}

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

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

1587

if(ret == -1){

1588

perror_plus("setenv");

1589

_exit(EX_OSERR);

1590

}

1591

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

1592

if(ret == -1){

1593

perror_plus("setenv");

1594

_exit(EX_OSERR);

1595

}

1596

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

1597

if(ret == -1){

1598

perror_plus("setenv");

1599

_exit(EX_OSERR);

1600

}

1601

char *delaystring;

1602

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

1603

if(ret == -1){

1604

perror_plus("asprintf");

1605

_exit(EX_OSERR);

1606

}

1607

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

1608

if(ret == -1){

1609

free(delaystring);

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

free(delaystring);

1614

if(connect_to != NULL){

1615

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

1616

if(ret == -1){

1617

perror_plus("setenv");

1618

_exit(EX_OSERR);

1619

}

1620

}

1621

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

1622

perror_plus("execl");

1623

_exit(EXIT_FAILURE);

1624

}

1625

} else {

1626

int status;

1627

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

1628

perror_plus("waitpid");

1629

free(fullname);

1630

continue;

1631

}

1632

if(WIFEXITED(status)){

1633

if(WEXITSTATUS(status) != 0){

1634

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

1635

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

1636

WEXITSTATUS(status));

1637

free(fullname);

1638

continue;

1639

}

1640

} else if(WIFSIGNALED(status)){

1641

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

1642

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

1643

WTERMSIG(status));

1644

free(fullname);

1645

continue;

1646

} else {

1647

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

1648

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

1649

free(fullname);

1650

continue;

1651

}

1652

}

1653

free(fullname);

1654

if(debug){

1655

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

1656

direntry->d_name);

1657

}

1658

}

1659

close(devnull);

1660

}

1661

}

1662

1663

__attribute__((nonnull, warn_unused_result))

1664

error_t bring_up_interface(const char *const interface,

1665

const float delay){

1666

error_t old_errno = errno;

1667

int ret;

1668

struct ifreq network;

1669

unsigned int if_index = if_nametoindex(interface);

1670

if(if_index == 0){

1671

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

1672

errno = old_errno;

1673

return ENXIO;

1674

}

1675

1676

if(quit_now){

1677

errno = old_errno;

1678

return EINTR;

1679

}

1680

1681

if(not interface_is_up(interface)){

1682

error_t ret_errno = 0, ioctl_errno = 0;

1683

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

1684

ret_errno = errno;

1685

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

1686

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

1687

errno = old_errno;

1688

return ret_errno;

1689

}

1690

network.ifr_flags |= IFF_UP; /* set flag */

1691

1692

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

1693

if(sd == -1){

1694

ret_errno = errno;

1695

perror_plus("socket");

1696

errno = old_errno;

1697

return ret_errno;

1698

}

1699

1700

if(quit_now){

1701

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

1702

if(ret == -1){

1703

perror_plus("close");

1704

}

1705

errno = old_errno;

1706

return EINTR;

1707

}

1708

1709

if(debug){

1710

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

1711

interface);

1712

}

1713

1714

/* Raise privileges */

1715

ret_errno = raise_privileges();

1716

bool restore_loglevel = false;

1717

if(ret_errno != 0){

1718

perror_plus("Failed to raise privileges");

1719

}

1720

#ifdef __linux__

1721

int ret_linux;

1722

if(ret_errno == 0){

1723

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1724

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

1725

ret_linux = klogctl(8, NULL, 5);

1726

if(ret_linux == -1){

1727

perror_plus("klogctl");

1728

} else {

1729

restore_loglevel = true;

1730

}

1731

}

1732

#endif /* __linux__ */

1733

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

1734

ioctl_errno = errno;

1735

#ifdef __linux__

1736

if(restore_loglevel){

1737

ret_linux = klogctl(7, NULL, 0);

1738

if(ret_linux == -1){

1739

perror_plus("klogctl");

1740

}

1741

}

1742

#endif /* __linux__ */

1743

1744

/* If raise_privileges() succeeded above */

1745

if(ret_errno == 0){

1746

/* Lower privileges */

1747

ret_errno = lower_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to lower privileges");

1751

}

1752

}

1753

1754

/* Close the socket */

1755

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

1756

if(ret == -1){

1757

perror_plus("close");

1758

}

1759

1760

if(ret_setflags == -1){

1761

errno = ioctl_errno;

1762

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1763

errno = old_errno;

1764

return ioctl_errno;

1765

}

1766

} else if(debug){

1767

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

1768

interface);

1769

}

1770

1771

/* Sleep checking until interface is running.

1772

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

1773

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

1774

if(interface_is_running(interface)){

1775

break;

1776

}

1777

struct timespec sleeptime = { .tv_nsec = 250000000 };

1778

ret = nanosleep(&sleeptime, NULL);

1779

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

1780

perror_plus("nanosleep");

1781

}

1782

}

1783

1784

errno = old_errno;

1785

return 0;

1786

}

1787

1788

__attribute__((nonnull, warn_unused_result))

1789

error_t take_down_interface(const char *const interface){

1790

error_t old_errno = errno;

1791

struct ifreq network;

1792

unsigned int if_index = if_nametoindex(interface);

1793

if(if_index == 0){

1794

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

1795

errno = old_errno;

1796

return ENXIO;

1797

}

1798

if(interface_is_up(interface)){

1799

error_t ret_errno = 0, ioctl_errno = 0;

1800

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

1801

ret_errno = errno;

1802

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

1803

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

1804

errno = old_errno;

1805

return ret_errno;

1806

}

1807

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

1808

1809

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

1810

if(sd == -1){

1811

ret_errno = errno;

1812

perror_plus("socket");

1813

errno = old_errno;

1814

return ret_errno;

1815

}

1816

1817

if(debug){

1818

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

1819

interface);

1820

}

1821

1822

/* Raise privileges */

1823

ret_errno = raise_privileges();

1824

if(ret_errno != 0){

1825

perror_plus("Failed to raise privileges");

1826

}

1827

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

1828

ioctl_errno = errno;

1829

1830

/* If raise_privileges() succeeded above */

1831

if(ret_errno == 0){

1832

/* Lower privileges */

1833

ret_errno = lower_privileges();

1834

if(ret_errno != 0){

1835

errno = ret_errno;

1836

perror_plus("Failed to lower privileges");

1837

}

1838

}

1839

1840

/* Close the socket */

1841

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

1842

if(ret == -1){

1843

perror_plus("close");

1844

}

1845

1846

if(ret_setflags == -1){

1847

errno = ioctl_errno;

1848

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1849

errno = old_errno;

1850

return ioctl_errno;

1851

}

1852

} else if(debug){

1853

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

1854

interface);

1855

}

1856

1857

errno = old_errno;

1858

return 0;

1859

}

1860

1861

1275

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

1862

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

1863

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

1864

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

1865

.interfaces = NULL, .interfaces_size = 0 };

1866

1276

AvahiSServiceBrowser *sb = NULL;

1867

error_t ret_errno;

1277

int error;

1868

1278

int ret;

1869

1279

intmax_t tmpmax;

1870

1280

char *tmp;

1871

1281

int exitcode = EXIT_SUCCESS;

1872

char *interfaces_to_take_down = NULL;

1873

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;

1874

1288

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

1875

1289

bool tempdir_created = false;

1876

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1877

1291

const char *seckey = PATHDIR "/" SECKEY;

1878

1292

const char *pubkey = PATHDIR "/" PUBKEY;

1879

char *interfaces_hooks = NULL;

1880

1293

1881

1294

bool gnutls_initialized = false;

1882

1295

bool gpgme_initialized = false;

1944

1357

.group = 2 },

1945

1358

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

1946

1359

.arg = "SECONDS",

1947

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

1948

.group = 2 },

1949

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

1950

.arg = "DIR",

1951

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

1360

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

1952

1361

.group = 2 },

1953

1362

/*

1954

1363

* These reproduce what we would get without ARGP_NO_HELP

1973

1382

connect_to = arg;

1974

1383

break;

1975

1384

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

1976

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

1977

arg, (int)',');

1978

if(ret_errno != 0){

1979

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

1980

}

1385

interface = arg;

1981

1386

break;

1982

1387

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

1983

1388

seckey = arg;

2012

1417

argp_error(state, "Bad retry interval");

2013

1418

}

2014

1419

break;

2015

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

2016

hookdir = arg;

2017

break;

2018

1420

/*

2019

1421

* These reproduce what we would get without ARGP_NO_HELP

2020

1422

*/

2026

1428

argp_state_help(state, state->out_stream,

2027

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2028

1430

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

2029

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

1431

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

2030

1432

exit(argp_err_exit_status);

2031

1433

break;

2032

1434

default:

2059

1461

{

2060

1462

/* Work around Debian bug #633582:

2061

1463

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

2062

2063

/* Re-raise privileges */

2064

ret_errno = raise_privileges();

2065

if(ret_errno != 0){

2066

errno = ret_errno;

2067

perror_plus("Failed to raise privileges");

2068

} else {

2069

struct stat st;

2070

2071

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

2072

int seckey_fd = open(seckey, O_RDONLY);

2073

if(seckey_fd == -1){

2074

perror_plus("open");

2075

} else {

2076

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

2077

if(ret == -1){

2078

perror_plus("fstat");

2079

} else {

2080

if(S_ISREG(st.st_mode)

2081

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

2082

ret = fchown(seckey_fd, uid, gid);

2083

if(ret == -1){

2084

perror_plus("fchown");

2085

}

2086

}

2087

}

2088

TEMP_FAILURE_RETRY(close(seckey_fd));

2089

}

2090

}

2091

2092

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

2093

int pubkey_fd = open(pubkey, O_RDONLY);

2094

if(pubkey_fd == -1){

2095

perror_plus("open");

2096

} else {

2097

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

2098

if(ret == -1){

2099

perror_plus("fstat");

2100

} else {

2101

if(S_ISREG(st.st_mode)

2102

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

2103

ret = fchown(pubkey_fd, uid, gid);

2104

if(ret == -1){

2105

perror_plus("fchown");

2106

}

2107

}

2108

}

2109

TEMP_FAILURE_RETRY(close(pubkey_fd));

2110

}

2111

}

2112

2113

/* Lower privileges */

2114

ret_errno = lower_privileges();

2115

if(ret_errno != 0){

2116

errno = ret_errno;

2117

perror_plus("Failed to lower privileges");

2118

}

2119

}

2120

}

2121

2122

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

2123

{

2124

char *interface = NULL;

2125

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

2126

interface))){

2127

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

2128

and if_nametoindex(interface) == 0){

2129

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

2130

fprintf_plus(stderr, "Not using nonexisting interface"

2131

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

2132

}

2133

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

2134

interface = NULL;

2135

}

2136

}

2137

}

2138

2139

/* Run network hooks */

2140

{

2141

if(mc.interfaces != NULL){

2142

interfaces_hooks = malloc(mc.interfaces_size);

2143

if(interfaces_hooks == NULL){

2144

perror_plus("malloc");

2145

goto end;

2146

}

2147

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

2148

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

2149

}

2150

run_network_hooks("start", interfaces_hooks != NULL ?

2151

interfaces_hooks : "", delay);

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

2152

1519

}

2153

1520

2154

1521

if(not debug){

2155

1522

avahi_set_log_function(empty_log);

2156

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

}

2157

1549

2158

1550

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

2159

1551

from the signal handler */

2160

1552

/* Initialize the pseudo-RNG for Avahi */

2161

1553

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

2162

simple_poll = avahi_simple_poll_new();

2163

if(simple_poll == NULL){

2164

fprintf_plus(stderr,

2165

"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");

2166

1557

exitcode = EX_UNAVAILABLE;

2167

1558

goto end;

2168

1559

}

2230

1621

}

2231

1622

}

2232

1623

2233

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

2234

if(mc.interfaces == NULL){

2235

struct dirent **direntries;

2236

/* Look for any good interfaces */

2237

ret = scandir(sys_class_net, &direntries, good_interface,

2238

alphasort);

2239

if(ret >= 1){

2240

/* Add all found interfaces to interfaces list */

2241

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

2242

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

2243

direntries[i]->d_name);

2244

if(ret_errno != 0){

2245

errno = ret_errno;

2246

perror_plus("argz_add");

2247

continue;

2248

}

2249

if(debug){

2250

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

2251

direntries[i]->d_name);

2252

}

2253

}

2254

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

}

2255

1760

} else {

2256

free(direntries);

2257

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

2258

exitcode = EXIT_FAILURE;

2259

goto end;

2260

}

2261

}

2262

2263

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

2264

{

2265

char *interface = NULL;

2266

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

2267

interface))){

2268

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

2269

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

2270

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

2271

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

2272

interface);

2273

interface = NULL;

2274

while((interface = argz_next(mc.interfaces,

2275

mc.interfaces_size, interface))){

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

}

2281

}

2282

break;

2283

}

2284

bool interface_was_up = interface_is_up(interface);

2285

errno = bring_up_interface(interface, delay);

2286

if(not interface_was_up){

2287

if(errno != 0){

2288

perror_plus("Failed to bring up interface");

2289

} else {

2290

errno = argz_add(&interfaces_to_take_down,

2291

&interfaces_to_take_down_size,

2292

interface);

2293

if(errno != 0){

2294

perror_plus("argz_add");

2295

}

2296

}

2297

}

2298

}

2299

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

2300

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

2301

}

2302

}

2303

2304

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

2305

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

2306

if(debug){

2307

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

2308

mc.interfaces);

2309

}

2310

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

}

2311

1767

}

2312

1768

2313

1769

if(quit_now){

2314

1770

goto end;

2315

1771

}

2316

1772

2317

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

1773

ret = init_gnutls_global(pubkey, seckey);

2318

1774

if(ret == -1){

2319

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

1775

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

2320

1776

exitcode = EX_UNAVAILABLE;

2321

1777

goto end;

2322

1778

} else {

2337

1793

goto end;

2338

1794

}

2339

1795

2340

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

2341

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

1796

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

1797

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

2342

1798

exitcode = EX_UNAVAILABLE;

2343

1799

goto end;

2344

1800

} else {

2353

1809

/* Connect directly, do not use Zeroconf */

2354

1810

/* (Mainly meant for debugging) */

2355

1811

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

2356

2357

1812

if(address == NULL){

2358

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

1813

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

2359

1814

exitcode = EX_USAGE;

2360

1815

goto end;

2361

1816

}

2364

1819

goto end;

2365

1820

}

2366

1821

2367

in_port_t port;

1822

uint16_t port;

2368

1823

errno = 0;

2369

1824

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

2370

1825

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

2371

or tmpmax != (in_port_t)tmpmax){

2372

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2373

1828

exitcode = EX_USAGE;

2374

1829

goto end;

2375

1830

}

2376

1831

2377

1832

if(quit_now){

2378

1833

goto end;

2379

1834

}

2380

1835

2381

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2382

1837

*address = '\0';

2383

1838

/* Colon in address indicates IPv6 */

2384

1839

int af;

2400

1855

}

2401

1856

2402

1857

while(not quit_now){

2403

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

2404

&mc);

1858

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

2405

1859

if(quit_now or ret == 0){

2406

1860

break;

2407

1861

}

2408

1862

if(debug){

2409

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

2410

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2411

1865

}

2412

sleep((unsigned int)retry_interval);

1866

sleep((int)retry_interval);

2413

1867

}

2414

1868

2415

if(not quit_now){

1869

if (not quit_now){

2416

1870

exitcode = EXIT_SUCCESS;

2417

1871

}

2418

1872

2419

1873

goto end;

2420

1874

}

2421

1875

2433

1887

config.publish_domain = 0;

2434

1888

2435

1889

/* Allocate a new server */

2436

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2437

&config, NULL, NULL, &ret_errno);

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2438

1893

2439

1894

/* Free the Avahi configuration data */

2440

1895

avahi_server_config_free(&config);

2442

1897

2443

1898

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

2444

1899

if(mc.server == NULL){

2445

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

2446

avahi_strerror(ret_errno));

1900

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

1901

avahi_strerror(error));

2447

1902

exitcode = EX_UNAVAILABLE;

2448

1903

goto end;

2449

1904

}

2455

1910

/* Create the Avahi service browser */

2456

1911

sb = avahi_s_service_browser_new(mc.server, if_index,

2457

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2458

NULL, 0, browse_callback,

2459

(void *)&mc);

1913

NULL, 0, browse_callback, NULL);

2460

1914

if(sb == NULL){

2461

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

2462

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)));

2463

1917

exitcode = EX_UNAVAILABLE;

2464

1918

goto end;

2465

1919

}

2471

1925

/* Run the main loop */

2472

1926

2473

1927

if(debug){

2474

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

1928

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

2475

1929

}

2476

1930

2477

ret = avahi_loop_with_timeout(simple_poll,

2478

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

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2479

1933

if(debug){

2480

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

2481

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

1934

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

1935

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

2482

1936

}

2483

1937

2484

1938

end:

2485

1939

2486

1940

if(debug){

2487

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

1941

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

2488

1942

}

2489

1943

2490

1944

/* Cleanup things */

2491

free(mc.interfaces);

2492

2493

1945

if(sb != NULL)

2494

1946

avahi_s_service_browser_free(sb);

2495

1947

2496

1948

if(mc.server != NULL)

2497

1949

avahi_server_free(mc.server);

2498

1950

2499

if(simple_poll != NULL)

2500

avahi_simple_poll_free(simple_poll);

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2501

1953

2502

1954

if(gnutls_initialized){

2503

1955

gnutls_certificate_free_credentials(mc.cred);

2508

1960

if(gpgme_initialized){

2509

1961

gpgme_release(mc.ctx);

2510

1962

}

2511

1963

2512

1964

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

2513

1965

has seen */

2514

1966

if(mc.current_server != NULL){

2520

1972

}

2521

1973

}

2522

1974

2523

/* Re-raise privileges */

2524

{

2525

ret_errno = raise_privileges();

2526

if(ret_errno != 0){

2527

perror_plus("Failed to raise privileges");

2528

} else {

2529

2530

/* Run network hooks */

2531

run_network_hooks("stop", interfaces_hooks != NULL ?

2532

interfaces_hooks : "", delay);

2533

2534

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

2535

{

2536

char *interface = NULL;

2537

while((interface=argz_next(interfaces_to_take_down,

2538

interfaces_to_take_down_size,

2539

interface))){

2540

ret_errno = take_down_interface(interface);

2541

if(ret_errno != 0){

2542

errno = ret_errno;

2543

perror_plus("Failed to take down interface");

2544

}

2545

}

2546

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

2547

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

2548

" down\n");

2549

}

2550

}

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");

2551

1982

}

2552

ret_errno = lower_privileges_permanently();

2553

if(ret_errno != 0){

2554

perror_plus("Failed to lower privileges permanently");

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");

1992

}

1993

}

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");

2003

}

2555

2004

}

2556

2005

}

2557

2006

2558

free(interfaces_to_take_down);

2559

free(interfaces_hooks);

2560

2561

2007

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

2562

2008

if(tempdir_created){

2563

2009

struct dirent **direntries = NULL;

2564

2010

struct dirent *direntry = NULL;

2565

2011

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

2566

2012

alphasort);

2567

if(numentries > 0){

2013

if (numentries > 0){

2568

2014

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

2569

2015

direntry = direntries[i];

2570

2016

char *fullname = NULL;

2576

2022

}

2577

2023

ret = remove(fullname);

2578

2024

if(ret == -1){

2579

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

2580

strerror(errno));

2025

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

2026

strerror(errno));

2581

2027

}

2582

2028

free(fullname);

2583

2029

}

2585

2031

2586

2032

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

2587

2033

free(direntries);

2588

if(numentries == -1){

2034

if (numentries == -1){

2589

2035

perror_plus("scandir");

2590

2036

}

2591

2037

ret = rmdir(tempdir);