/mandos/trunk : revision 505.2.4

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

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

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}

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/*

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* "buffer_length" is how much is already used.

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*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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

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if(buffer == NULL){

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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

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int af, server **current_server){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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int ret;

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

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if(new_server == NULL){

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206

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){

237

perror_plus("clock_gettime");

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return false;

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return -1;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

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} else {

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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mc.current_server->prev = new_server;

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}

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

230

if(ret == -1){

231

perror_plus("clock_gettime");

232

return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey, const char *pubkey,

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const char *tempdir, mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

279

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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265

}

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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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301

}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

327

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if(engine_info == NULL){

328

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

329

tempdir);

311

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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333

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/* Create new GPGME "context" */

334

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

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

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if(rc != GPG_ERR_NO_ERROR){

336

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

337

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

338

gpgme_strerror(rc));

318

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

319

gpgme_strsource(rc), gpgme_strerror(rc));

339

320

return false;

340

321

}

341

322

352

333

*/

353

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

335

size_t crypto_size,

355

char **plaintext,

356

mandos_context *mc){

336

char **plaintext){

357

337

gpgme_data_t dh_crypto, dh_plain;

358

338

gpgme_error_t rc;

359

339

ssize_t ret;

361

341

ssize_t plaintext_length = 0;

362

342

363

343

if(debug){

364

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

344

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

365

345

}

366

346

367

347

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

368

348

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

369

349

0);

370

350

if(rc != GPG_ERR_NO_ERROR){

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

373

353

return -1;

374

354

}

375

355

376

356

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

377

357

rc = gpgme_data_new(&dh_plain);

378

358

if(rc != GPG_ERR_NO_ERROR){

379

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

380

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

381

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

382

361

gpgme_data_release(dh_crypto);

383

362

return -1;

384

363

}

385

364

386

365

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

387

366

data buffer */

388

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

367

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

389

368

if(rc != GPG_ERR_NO_ERROR){

390

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

391

gpgme_strsource(rc), gpgme_strerror(rc));

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

392

371

plaintext_length = -1;

393

372

if(debug){

394

373

gpgme_decrypt_result_t result;

395

result = gpgme_op_decrypt_result(mc->ctx);

374

result = gpgme_op_decrypt_result(mc.ctx);

396

375

if(result == NULL){

397

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

376

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

398

377

} else {

399

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

400

result->unsupported_algorithm);

401

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

402

result->wrong_key_usage);

378

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

379

result->unsupported_algorithm);

380

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

381

result->wrong_key_usage);

403

382

if(result->file_name != NULL){

404

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

383

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

405

384

}

406

385

gpgme_recipient_t recipient;

407

386

recipient = result->recipients;

408

387

while(recipient != NULL){

409

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

410

gpgme_pubkey_algo_name

411

(recipient->pubkey_algo));

412

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

413

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

414

recipient->status == GPG_ERR_NO_SECKEY

415

? "No" : "Yes");

388

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

389

gpgme_pubkey_algo_name(recipient->pubkey_algo));

390

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

391

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

392

recipient->status == GPG_ERR_NO_SECKEY

393

? "No" : "Yes");

416

394

recipient = recipient->next;

417

395

}

418

396

}

421

399

}

422

400

423

401

if(debug){

424

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

402

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

425

403

}

426

404

427

405

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

434

412

*plaintext = NULL;

435

413

while(true){

436

414

plaintext_capacity = incbuffer(plaintext,

437

(size_t)plaintext_length,

438

plaintext_capacity);

415

(size_t)plaintext_length,

416

plaintext_capacity);

439

417

if(plaintext_capacity == 0){

440

perror_plus("incbuffer");

441

plaintext_length = -1;

442

goto decrypt_end;

418

perror_plus("incbuffer");

419

plaintext_length = -1;

420

goto decrypt_end;

443

421

}

444

422

445

423

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

458

436

}

459

437

460

438

if(debug){

461

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

439

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

462

440

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

463

441

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

464

442

}

476

454

}

477

455

478

456

static const char * safer_gnutls_strerror(int value){

479

const char *ret = gnutls_strerror(value);

457

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

458

-Wunreachable-code */

480

459

if(ret == NULL)

481

460

ret = "(unknown)";

482

461

return ret;

485

464

/* GnuTLS log function callback */

486

465

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

487

466

const char* string){

488

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

467

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

489

468

}

490

469

491

470

static int init_gnutls_global(const char *pubkeyfilename,

492

const char *seckeyfilename,

493

mandos_context *mc){

471

const char *seckeyfilename){

494

472

int ret;

495

473

496

474

if(debug){

497

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

475

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

498

476

}

499

477

500

478

ret = gnutls_global_init();

501

479

if(ret != GNUTLS_E_SUCCESS){

502

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

503

safer_gnutls_strerror(ret));

480

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

481

safer_gnutls_strerror(ret));

504

482

return -1;

505

483

}

506

484

513

491

}

514

492

515

493

/* OpenPGP credentials */

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

517

495

if(ret != GNUTLS_E_SUCCESS){

518

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

519

safer_gnutls_strerror(ret));

496

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

497

safer_gnutls_strerror(ret));

520

498

gnutls_global_deinit();

521

499

return -1;

522

500

}

523

501

524

502

if(debug){

525

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

526

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

527

pubkeyfilename,

528

seckeyfilename);

503

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

504

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

505

seckeyfilename);

529

506

}

530

507

531

508

ret = gnutls_certificate_set_openpgp_key_file

532

(mc->cred, pubkeyfilename, seckeyfilename,

509

(mc.cred, pubkeyfilename, seckeyfilename,

533

510

GNUTLS_OPENPGP_FMT_BASE64);

534

511

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr,

536

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

537

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

538

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

539

safer_gnutls_strerror(ret));

512

fprintf(stderr,

513

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

514

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

515

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

516

safer_gnutls_strerror(ret));

540

517

goto globalfail;

541

518

}

542

519

543

520

/* GnuTLS server initialization */

544

ret = gnutls_dh_params_init(&mc->dh_params);

521

ret = gnutls_dh_params_init(&mc.dh_params);

545

522

if(ret != GNUTLS_E_SUCCESS){

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

" initialization: %s\n",

548

safer_gnutls_strerror(ret));

523

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

524

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

549

525

goto globalfail;

550

526

}

551

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

527

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

552

528

if(ret != GNUTLS_E_SUCCESS){

553

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

554

safer_gnutls_strerror(ret));

529

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

530

safer_gnutls_strerror(ret));

555

531

goto globalfail;

556

532

}

557

533

558

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

534

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

559

535

560

536

return 0;

561

537

562

538

globalfail:

563

539

564

gnutls_certificate_free_credentials(mc->cred);

540

gnutls_certificate_free_credentials(mc.cred);

565

541

gnutls_global_deinit();

566

gnutls_dh_params_deinit(mc->dh_params);

542

gnutls_dh_params_deinit(mc.dh_params);

567

543

return -1;

568

544

}

569

545

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

546

static int init_gnutls_session(gnutls_session_t *session){

572

547

int ret;

573

548

/* GnuTLS session creation */

574

549

do {

578

553

}

579

554

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

580

555

if(ret != GNUTLS_E_SUCCESS){

581

fprintf_plus(stderr,

582

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

583

safer_gnutls_strerror(ret));

556

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

557

safer_gnutls_strerror(ret));

584

558

}

585

559

586

560

{

587

561

const char *err;

588

562

do {

589

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

563

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

590

564

if(quit_now){

591

565

gnutls_deinit(*session);

592

566

return -1;

593

567

}

594

568

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

595

569

if(ret != GNUTLS_E_SUCCESS){

596

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

597

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

598

safer_gnutls_strerror(ret));

570

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

571

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

572

safer_gnutls_strerror(ret));

599

573

gnutls_deinit(*session);

600

574

return -1;

601

575

}

603

577

604

578

do {

605

579

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

606

mc->cred);

580

mc.cred);

607

581

if(quit_now){

608

582

gnutls_deinit(*session);

609

583

return -1;

610

584

}

611

585

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

612

586

if(ret != GNUTLS_E_SUCCESS){

613

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

614

safer_gnutls_strerror(ret));

587

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

588

safer_gnutls_strerror(ret));

615

589

gnutls_deinit(*session);

616

590

return -1;

617

591

}

619

593

/* ignore client certificate if any. */

620

594

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

621

595

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

623

597

624

598

return 0;

625

599

}

629

603

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

630

604

631

605

/* Called when a Mandos server is found */

632

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

606

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

633

607

AvahiIfIndex if_index,

634

int af, mandos_context *mc){

608

int af){

635

609

int ret, tcp_sd = -1;

636

610

ssize_t sret;

637

611

union {

662

636

pf = PF_INET;

663

637

break;

664

638

default:

665

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

639

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

666

640

errno = EINVAL;

667

641

return -1;

668

642

}

669

643

670

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

671

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

672

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

673

bool match = false;

674

{

675

char *interface = NULL;

676

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

677

interface))){

678

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

679

match = true;

680

break;

681

}

682

}

683

}

684

if(not match){

685

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

686

connect to the server */

687

if(debug){

688

char interface[IF_NAMESIZE];

689

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

690

perror_plus("if_indextoname");

691

} else {

692

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

693

" \"%s\"\n",

694

if_indextoname((unsigned int)if_index,

695

interface));

696

}

697

}

698

return -1;

699

}

700

}

701

702

ret = init_gnutls_session(&session, mc);

644

ret = init_gnutls_session(&session);

703

645

if(ret != 0){

704

646

return -1;

705

647

}

706

648

707

649

if(debug){

708

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

709

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

650

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

651

"\n", ip, port);

710

652

}

711

653

712

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

738

680

}

739

681

if(ret == 0){

740

682

int e = errno;

741

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

683

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

742

684

errno = e;

743

685

goto mandos_end;

744

686

}

745

687

if(af == AF_INET6){

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

688

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

689

-Wconversion and

690

-Wunreachable-code */

691

751

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

693

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

694

-Wunreachable-code*/

756

695

if(if_index == AVAHI_IF_UNSPEC){

757

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

758

" incomplete without a network interface\n");

696

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

697

" without a network interface\n");

759

698

errno = EINVAL;

760

699

goto mandos_end;

761

700

}

763

702

to.in6.sin6_scope_id = (uint32_t)if_index;

764

703

}

765

704

} else {

766

to.in.sin_port = htons(port);

705

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

706

-Wconversion and

707

-Wunreachable-code */

767

708

}

768

709

769

710

if(quit_now){

777

718

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

778

719

perror_plus("if_indextoname");

779

720

} else {

780

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

781

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

721

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

722

ip, interface, port);

782

723

}

783

724

} else {

784

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

785

ip, (uintmax_t)port);

725

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

726

port);

786

727

}

787

728

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

788

729

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

const char *pcret;

789

731

if(af == AF_INET6){

790

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

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

732

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

733

sizeof(addrstr));

793

734

} else {

794

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

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

735

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

736

sizeof(addrstr));

797

737

}

798

if(ret == EAI_SYSTEM){

799

perror_plus("getnameinfo");

800

} else if(ret != 0) {

801

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

802

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

803

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

738

if(pcret == NULL){

739

perror_plus("inet_ntop");

740

} else {

741

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

742

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

743

}

804

744

}

805

745

}

806

746

833

773

while(true){

834

774

size_t out_size = strlen(out);

835

775

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

836

out_size - written));

776

out_size - written));

837

777

if(ret == -1){

838

778

int e = errno;

839

779

perror_plus("write");

859

799

}

860

800

861

801

if(debug){

862

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

802

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

863

803

}

864

804

865

805

if(quit_now){

867

807

goto mandos_end;

868

808

}

869

809

870

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

871

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

872

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

873

gnutls_transport_set_ptr(session,

874

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

810

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

811

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

812

876

813

if(quit_now){

877

814

errno = EINTR;

888

825

889

826

if(ret != GNUTLS_E_SUCCESS){

890

827

if(debug){

891

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

828

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

892

829

gnutls_perror(ret);

893

830

}

894

831

errno = EPROTO;

898

835

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

899

836

900

837

if(debug){

901

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

902

" %s\n", ip);

838

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

839

ip);

903

840

}

904

841

905

842

while(true){

910

847

}

911

848

912

849

buffer_capacity = incbuffer(&buffer, buffer_length,

913

buffer_capacity);

850

buffer_capacity);

914

851

if(buffer_capacity == 0){

915

852

int e = errno;

916

853

perror_plus("incbuffer");

943

880

}

944

881

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

945

882

if(ret < 0){

946

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

947

"***\n");

883

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

948

884

gnutls_perror(ret);

949

885

errno = EPROTO;

950

886

goto mandos_end;

951

887

}

952

888

break;

953

889

default:

954

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

955

" encrypted session with Mandos server\n");

890

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

891

" encrypted session with Mandos server\n");

956

892

gnutls_bye(session, GNUTLS_SHUT_RDWR);

957

893

errno = EIO;

958

894

goto mandos_end;

963

899

}

964

900

965

901

if(debug){

966

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

902

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

967

903

}

968

904

969

905

if(quit_now){

981

917

982

918

if(buffer_length > 0){

983

919

ssize_t decrypted_buffer_size;

984

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

985

&decrypted_buffer, mc);

920

decrypted_buffer_size = pgp_packet_decrypt(buffer,

921

buffer_length,

922

&decrypted_buffer);

986

923

if(decrypted_buffer_size >= 0){

987

924

988

925

written = 0;

998

935

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

999

936

int e = errno;

1000

937

if(debug){

1001

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

1002

strerror(errno));

938

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

939

strerror(errno));

1003

940

}

1004

941

errno = e;

1005

942

goto mandos_end;

1049

986

AVAHI_GCC_UNUSED AvahiStringList *txt,

1050

987

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1051

988

flags,

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

989

AVAHI_GCC_UNUSED void* userdata){

990

assert(r);

1056

991

1057

992

/* Called whenever a service has been resolved successfully or

1058

993

timed out */

1064

999

switch(event){

1065

1000

default:

1066

1001

case AVAHI_RESOLVER_FAILURE:

1067

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

1068

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

1069

domain,

1070

avahi_strerror(avahi_server_errno

1071

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

1002

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

1003

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

1004

avahi_strerror(avahi_server_errno(mc.server)));

1072

1005

break;

1073

1006

1074

1007

case AVAHI_RESOLVER_FOUND:

1076

1009

char ip[AVAHI_ADDRESS_STR_MAX];

1077

1010

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

1078

1011

if(debug){

1079

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

1080

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

1081

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

1012

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

1013

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

1014

ip, (intmax_t)interface, port);

1082

1015

}

1083

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

1084

interface,

1085

avahi_proto_to_af(proto),

1086

mc);

1016

int ret = start_mandos_communication(ip, port, interface,

1017

avahi_proto_to_af(proto));

1087

1018

if(ret == 0){

1088

avahi_simple_poll_quit(simple_poll);

1019

avahi_simple_poll_quit(mc.simple_poll);

1089

1020

} else {

1090

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

1091

avahi_proto_to_af(proto),

1092

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

1093

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

1094

" list\n", name);

1095

}

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

1096

1023

}

1097

1024

}

1098

1025

}

1108

1035

const char *domain,

1109

1036

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1110

1037

flags,

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

1038

AVAHI_GCC_UNUSED void* userdata){

1039

assert(b);

1115

1040

1116

1041

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

1117

1042

is removed from the LAN */

1124

1049

default:

1125

1050

case AVAHI_BROWSER_FAILURE:

1126

1051

1127

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

1128

avahi_strerror(avahi_server_errno

1129

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

1130

avahi_simple_poll_quit(simple_poll);

1052

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

1053

avahi_strerror(avahi_server_errno(mc.server)));

1054

avahi_simple_poll_quit(mc.simple_poll);

1131

1055

return;

1132

1056

1133

1057

case AVAHI_BROWSER_NEW:

1136

1060

the callback function is called the Avahi server will free the

1137

1061

resolver for us. */

1138

1062

1139

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

1140

interface, protocol, name, type,

1141

domain, protocol, 0,

1142

resolve_callback, mc) == NULL)

1143

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

1144

" %s\n", name,

1145

avahi_strerror(avahi_server_errno

1146

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

1063

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

1064

name, type, domain, protocol, 0,

1065

resolve_callback, NULL) == NULL)

1066

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

1067

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

1147

1068

break;

1148

1069

1149

1070

case AVAHI_BROWSER_REMOVE:

1152

1073

case AVAHI_BROWSER_ALL_FOR_NOW:

1153

1074

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1154

1075

if(debug){

1155

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

1156

" searching...\n");

1076

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

1157

1077

}

1158

1078

break;

1159

1079

}

1168

1088

signal_received = sig;

1169

1089

int old_errno = errno;

1170

1090

/* set main loop to exit */

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1091

if(mc.simple_poll != NULL){

1092

avahi_simple_poll_quit(mc.simple_poll);

1173

1093

}

1174

1094

errno = old_errno;

1175

1095

}

1176

1096

1177

1097

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

1178

1098

int ret;

1179

error_t ret_errno;

1180

1099

1181

1100

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

1182

1101

if(s < 0){

1183

ret_errno = errno;

1184

1102

perror_plus("socket");

1185

errno = ret_errno;

1186

1103

return false;

1187

1104

}

1188

1105

strcpy(ifr->ifr_name, ifname);

1189

1106

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1190

1107

if(ret == -1){

1191

1108

if(debug){

1192

ret_errno = errno;

1193

1109

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1195

1110

}

1196

1111

return false;

1197

1112

}

1203

1118

/* Reject the loopback device */

1204

1119

if(ifr->ifr_flags & IFF_LOOPBACK){

1205

1120

if(debug){

1206

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

1207

ifname);

1121

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

1122

ifname);

1208

1123

}

1209

1124

return false;

1210

1125

}

1211

1126

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

1212

1127

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

1213

1128

if(debug){

1214

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

1215

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

1129

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

1130

ifname);

1216

1131

}

1217

1132

return true;

1218

1133

}

1219

1134

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

1220

1135

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

1221

1136

if(debug){

1222

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1223

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

1137

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

1138

ifname);

1224

1139

}

1225

1140

return false;

1226

1141

}

1227

1142

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

1228

1143

if(ifr->ifr_flags & IFF_NOARP){

1229

1144

if(debug){

1230

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

1231

ifname);

1145

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

1232

1146

}

1233

1147

return false;

1234

1148

}

1235

1149

1236

1150

/* Accept this device */

1237

1151

if(debug){

1238

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

1152

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

1239

1153

}

1240

1154

return true;

1241

1155

}

1246

1160

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

1247

1161

*/

1248

1162

int good_interface(const struct dirent *if_entry){

1163

int ret;

1249

1164

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

1250

1165

return 0;

1251

1166

}

1252

1253

1167

struct ifreq ifr;

1168

1254

1169

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

1255

if(debug){

1256

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

1257

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

1258

}

1259

1170

return 0;

1260

1171

}

1261

1172

1266

1177

}

1267

1178

1268

1179

/*

1269

* This function determines if a network interface is up.

1180

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

1181

* corresponds to an acceptable network device which is up.

1182

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

1270

1183

*/

1271

bool interface_is_up(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1282

}

1184

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

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

1188

return 0;

1189

}

1190

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

1191

if_entry->d_name);

1192

if(ret < 0){

1193

perror_plus("asprintf");

1194

return 0;

1195

}

1196

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

1197

if(flags_fd == -1){

1198

perror_plus("open");

1199

free(flagname);

1200

return 0;

1201

}

1202

free(flagname);

1203

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

1204

/* read line from flags_fd */

1205

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

1206

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

1207

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

1208

if(flagstring == NULL){

1209

perror_plus("malloc");

1210

close(flags_fd);

1211

return 0;

1212

}

1213

while(to_read > 0){

1214

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

1215

(size_t)to_read));

1216

if(ssret == -1){

1217

perror_plus("read");

1218

free(flagstring);

1219

close(flags_fd);

1220

return 0;

1221

}

1222

to_read -= ssret;

1223

if(ssret == 0){

1224

break;

1225

}

1226

}

1227

close(flags_fd);

1228

intmax_t tmpmax;

1229

char *tmp;

1230

errno = 0;

1231

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

1232

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

1233

and not (isspace(*tmp)))

1234

or tmpmax != (ifreq_flags)tmpmax){

1235

if(debug){

1236

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

1237

flagstring, if_entry->d_name);

1238

}

1239

free(flagstring);

1240

return 0;

1241

}

1242

free(flagstring);

1243

ifreq_flags flags = (ifreq_flags)tmpmax;

1244

/* Reject the loopback device */

1245

if(flags & IFF_LOOPBACK){

1246

if(debug){

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1283

1252

1284

/*

1285

* This function determines if a network interface is running

1286

*/

1287

bool interface_is_running(const char *interface){

1288

struct ifreq ifr;

1289

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

1290

if(debug){

1291

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

1292

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

1293

}

1294

return false;

1253

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1295

1256

}

1296

1257

1297

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

1258

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

1259

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

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

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

1285

if_entry->d_name);

1286

}

1287

return 1;

1298

1288

}

1299

1289

1300

1290

int notdotentries(const struct dirent *direntry){

1311

1301

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

1312

1302

int runnable_hook(const struct dirent *direntry){

1313

1303

int ret;

1314

size_t sret;

1315

1304

struct stat st;

1316

1305

1317

1306

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

1319

1308

return 0;

1320

1309

}

1321

1310

1322

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

1323

"abcdefghijklmnopqrstuvwxyz"

1324

"0123456789"

1325

"_-");

1326

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

1327

/* Contains non-allowed characters */

1328

if(debug){

1329

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

1330

direntry->d_name);

1331

}

1332

return 0;

1333

}

1334

1335

char *fullname = NULL;

1336

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

1337

if(ret < 0){

1338

perror_plus("asprintf");

1339

return 0;

1340

}

1341

1342

ret = stat(fullname, &st);

1311

/* Save pointer to last character */

1312

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

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

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

1320

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

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

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

1343

1328

if(ret == -1){

1344

1329

if(debug){

1345

perror_plus("Could not stat hook");

1330

perror_plus("Could not stat plugin");

1346

1331

}

1347

1332

return 0;

1348

1333

}

1349

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

1334

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

1350

1335

/* Not a regular file */

1351

if(debug){

1352

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

1353

direntry->d_name);

1354

}

1355

1336

return 0;

1356

1337

}

1357

1338

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

1358

1339

/* Not executable */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

1340

return 0;

1364

1341

}

1365

if(debug){

1366

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

1367

direntry->d_name);

1368

}

1369

1342

return 1;

1370

1343

}

1371

1344

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

mandos_context *mc){

1345

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1374

1346

int ret;

1375

1347

struct timespec now;

1376

1348

struct timespec waited_time;

1377

1349

intmax_t block_time;

1378

1350

1379

1351

while(true){

1380

if(mc->current_server == NULL){

1352

if(mc.current_server == NULL){

1381

1353

if (debug){

1382

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

1383

" No timeout!\n");

1354

fprintf(stderr,

1355

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

1384

1356

}

1385

1357

ret = avahi_simple_poll_iterate(s, -1);

1386

1358

} else {

1387

1359

if (debug){

1388

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

1389

" it, or wait\n");

1360

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

1361

" or wait\n");

1390

1362

}

1391

1363

/* the current time */

1392

1364

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1397

1369

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

1398

1370

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

1399

1371

waited_time.tv_sec = (now.tv_sec

1400

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

1372

- mc.current_server->last_seen.tv_sec);

1401

1373

waited_time.tv_nsec = (now.tv_nsec

1402

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

1374

- mc.current_server->last_seen.tv_nsec);

1403

1375

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

1404

1376

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

1405

1377

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

1408

1380

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

1409

1381

1410

1382

if (debug){

1411

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

1412

block_time);

1383

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

1413

1384

}

1414

1385

1415

1386

if(block_time <= 0){

1416

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

1417

mc->current_server->port,

1418

mc->current_server->if_index,

1419

mc->current_server->af, mc);

1387

ret = start_mandos_communication(mc.current_server->ip,

1388

mc.current_server->port,

1389

mc.current_server->if_index,

1390

mc.current_server->af);

1420

1391

if(ret == 0){

1421

avahi_simple_poll_quit(s);

1392

avahi_simple_poll_quit(mc.simple_poll);

1422

1393

return 0;

1423

1394

}

1424

1395

ret = clock_gettime(CLOCK_MONOTONIC,

1425

&mc->current_server->last_seen);

1396

&mc.current_server->last_seen);

1426

1397

if(ret == -1){

1427

1398

perror_plus("clock_gettime");

1428

1399

return -1;

1429

1400

}

1430

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

1401

mc.current_server = mc.current_server->next;

1431

1402

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

1432

1403

servers, but don't block */

1433

1404

}

1435

1406

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

1436

1407

}

1437

1408

if(ret != 0){

1438

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

1409

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

1439

1410

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

1440

1411

}

1441

1412

}

1442

1413

}

1443

1414

}

1444

1415

1445

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

1446

error_t raise_privileges(void){

1447

error_t old_errno = errno;

1448

error_t ret_errno = 0;

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t raise_privileges_permanently(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = raise_privileges();

1461

if(ret_errno != 0){

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

error_t lower_privileges(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = 0;

1477

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

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

/* Lower privileges permanently */

1486

error_t lower_privileges_permanently(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("setuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

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

1498

const float delay){

1499

struct dirent **direntries;

1500

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

1501

alphasort);

1502

if(numhooks == -1){

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1510

}

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

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

1515

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

1516

direntry = direntries[i];

1517

char *fullname = NULL;

1518

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

1519

if(ret < 0){

1520

perror_plus("asprintf");

1521

continue;

1522

}

1523

if(debug){

1524

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

1525

direntry->d_name);

1526

}

1527

pid_t hook_pid = fork();

1528

if(hook_pid == 0){

1529

/* Child */

1530

/* Raise privileges */

1531

raise_privileges_permanently();

1532

/* Set group */

1533

errno = 0;

1534

ret = setgid(0);

1535

if(ret == -1){

1536

perror_plus("setgid");

1537

}

1538

/* Reset supplementary groups */

1539

errno = 0;

1540

ret = setgroups(0, NULL);

1541

if(ret == -1){

1542

perror_plus("setgroups");

1543

}

1544

dup2(devnull, STDIN_FILENO);

1545

close(devnull);

1546

dup2(STDERR_FILENO, STDOUT_FILENO);

1547

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

1548

if(ret == -1){

1549

perror_plus("setenv");

1550

_exit(EX_OSERR);

1551

}

1552

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

1553

if(ret == -1){

1554

perror_plus("setenv");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

perror_plus("setenv");

1560

_exit(EX_OSERR);

1561

}

1562

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

1563

if(ret == -1){

1564

perror_plus("setenv");

1565

_exit(EX_OSERR);

1566

}

1567

char *delaystring;

1568

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

1569

if(ret == -1){

1570

perror_plus("asprintf");

1571

_exit(EX_OSERR);

1572

}

1573

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

1574

if(ret == -1){

1575

free(delaystring);

1576

perror_plus("setenv");

1577

_exit(EX_OSERR);

1578

}

1579

free(delaystring);

1580

if(connect_to != NULL){

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

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

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1591

} else {

1592

int status;

1593

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

1594

perror_plus("waitpid");

1595

free(fullname);

1596

continue;

1597

}

1598

if(WIFEXITED(status)){

1599

if(WEXITSTATUS(status) != 0){

1600

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

1601

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

1602

WEXITSTATUS(status));

1603

free(fullname);

1604

continue;

1605

}

1606

} else if(WIFSIGNALED(status)){

1607

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

1608

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

1609

WTERMSIG(status));

1610

free(fullname);

1611

continue;

1612

} else {

1613

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

1614

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

1615

free(fullname);

1616

continue;

1617

}

1618

}

1619

free(fullname);

1620

if(debug){

1621

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

1622

direntry->d_name);

1623

}

1624

}

1625

close(devnull);

1626

}

1627

return true;

1628

}

1629

1630

error_t bring_up_interface(const char *const interface,

1631

const float delay){

1632

int sd = -1;

1633

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1636

struct ifreq network;

1637

unsigned int if_index = if_nametoindex(interface);

1638

if(if_index == 0){

1639

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

1640

errno = old_errno;

1641

return ENXIO;

1642

}

1643

1644

if(quit_now){

1645

errno = old_errno;

1646

return EINTR;

1647

}

1648

1649

if(not interface_is_up(interface)){

1650

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

1651

ret_errno = errno;

1652

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

1653

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

1654

return ret_errno;

1655

}

1656

network.ifr_flags |= IFF_UP;

1657

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1660

ret_errno = errno;

1661

perror_plus("socket");

1662

errno = old_errno;

1663

return ret_errno;

1664

}

1665

1666

if(quit_now){

1667

close(sd);

1668

errno = old_errno;

1669

return EINTR;

1670

}

1671

1672

if(debug){

1673

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

1674

interface);

1675

}

1676

1677

/* Raise priviliges */

1678

raise_privileges();

1679

1680

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

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

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1688

}

1689

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1692

#ifdef __linux__

1693

if(restore_loglevel){

1694

ret_linux = klogctl(7, NULL, 0);

1695

if(ret_linux == -1){

1696

perror_plus("klogctl");

1697

}

1698

}

1699

#endif /* __linux__ */

1700

1701

/* Lower privileges */

1702

lower_privileges();

1703

1704

/* Close the socket */

1705

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

1706

if(ret == -1){

1707

perror_plus("close");

1708

}

1709

1710

if(ret_setflags == -1){

1711

errno = ret_errno;

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1713

errno = old_errno;

1714

return ret_errno;

1715

}

1716

} else if(debug){

1717

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

1718

interface);

1719

}

1720

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

if(interface_is_running(interface)){

1725

break;

1726

}

1727

struct timespec sleeptime = { .tv_nsec = 250000000 };

1728

ret = nanosleep(&sleeptime, NULL);

1729

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

1730

perror_plus("nanosleep");

1731

}

1732

}

1733

1734

errno = old_errno;

1735

return 0;

1736

}

1737

1738

error_t take_down_interface(const char *const interface){

1739

error_t old_errno = errno;

1740

struct ifreq network;

1741

unsigned int if_index = if_nametoindex(interface);

1742

if(if_index == 0){

1743

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

1744

errno = old_errno;

1745

return ENXIO;

1746

}

1747

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1749

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

1750

ret_errno = errno;

1751

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

1752

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

1753

return ret_errno;

1754

}

1755

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

1756

1757

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

1758

if(sd < 0){

1759

ret_errno = errno;

1760

perror_plus("socket");

1761

errno = old_errno;

1762

return ret_errno;

1763

}

1764

1765

if(debug){

1766

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

1767

interface);

1768

}

1769

1770

/* Raise priviliges */

1771

raise_privileges();

1772

1773

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

1774

ret_errno = errno;

1775

1776

/* Lower privileges */

1777

lower_privileges();

1778

1779

/* Close the socket */

1780

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

1781

if(ret == -1){

1782

perror_plus("close");

1783

}

1784

1785

if(ret_setflags == -1){

1786

errno = ret_errno;

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

errno = old_errno;

1789

return ret_errno;

1790

}

1791

} else if(debug){

1792

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

1793

interface);

1794

}

1795

1796

errno = old_errno;

1797

return 0;

1798

}

1799

1800

1416

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

1801

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

1802

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

1803

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

1804

.interfaces = NULL, .interfaces_size = 0 };

1805

1417

AvahiSServiceBrowser *sb = NULL;

1806

error_t ret_errno;

1418

int error;

1807

1419

int ret;

1808

1420

intmax_t tmpmax;

1809

1421

char *tmp;

1810

1422

int exitcode = EXIT_SUCCESS;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1423

const char *interface = "";

1424

struct ifreq network;

1425

int sd = -1;

1426

bool take_down_interface = false;

1427

uid_t uid;

1428

gid_t gid;

1813

1429

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

1814

1430

bool tempdir_created = false;

1815

1431

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1816

1432

const char *seckey = PATHDIR "/" SECKEY;

1817

1433

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1819

1434

1820

1435

bool gnutls_initialized = false;

1821

1436

bool gpgme_initialized = false;

1883

1498

.group = 2 },

1884

1499

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

1885

1500

.arg = "SECONDS",

1886

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

1887

.group = 2 },

1888

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

1889

.arg = "DIR",

1890

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

1501

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

1891

1502

.group = 2 },

1892

1503

/*

1893

1504

* These reproduce what we would get without ARGP_NO_HELP

1912

1523

connect_to = arg;

1913

1524

break;

1914

1525

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

1915

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

1916

arg, (int)',');

1917

if(ret_errno != 0){

1918

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

1919

}

1526

interface = arg;

1920

1527

break;

1921

1528

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

1922

1529

seckey = arg;

1951

1558

argp_error(state, "Bad retry interval");

1952

1559

}

1953

1560

break;

1954

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

1955

hookdir = arg;

1956

break;

1957

1561

/*

1958

1562

* These reproduce what we would get without ARGP_NO_HELP

1959

1563

*/

1965

1569

argp_state_help(state, state->out_stream,

1966

1570

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1967

1571

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

1968

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

1572

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

1969

1573

exit(argp_err_exit_status);

1970

1574

break;

1971

1575

default:

1998

1602

{

1999

1603

/* Work around Debian bug #633582:

2000

1604

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

1605

struct stat st;

2001

1606

2002

1607

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2004

struct stat st;

2005

2006

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

2007

int seckey_fd = open(seckey, O_RDONLY);

2008

if(seckey_fd == -1){

2009

perror_plus("open");

2010

} else {

2011

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

2012

if(ret == -1){

2013

perror_plus("fstat");

2014

} else {

2015

if(S_ISREG(st.st_mode)

2016

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

2017

ret = fchown(seckey_fd, uid, gid);

2018

if(ret == -1){

2019

perror_plus("fchown");

2020

}

2021

}

2022

}

2023

TEMP_FAILURE_RETRY(close(seckey_fd));

2024

}

2025

}

2026

2027

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

2028

int pubkey_fd = open(pubkey, O_RDONLY);

2029

if(pubkey_fd == -1){

2030

perror_plus("open");

2031

} else {

2032

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

2033

if(ret == -1){

2034

perror_plus("fstat");

2035

} else {

2036

if(S_ISREG(st.st_mode)

2037

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

2038

ret = fchown(pubkey_fd, uid, gid);

2039

if(ret == -1){

2040

perror_plus("fchown");

2041

}

2042

}

2043

}

2044

TEMP_FAILURE_RETRY(close(pubkey_fd));

2045

}

2046

}

2047

2048

/* Lower privileges */

2049

lower_privileges();

2050

}

2051

}

2052

2053

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

2054

{

2055

char *interface = NULL;

2056

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

2057

interface))){

2058

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

2059

and if_nametoindex(interface) == 0){

2060

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

2061

fprintf_plus(stderr, "Not using nonexisting interface"

2062

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

2063

}

2064

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

2065

interface = NULL;

2066

}

2067

}

2068

}

2069

2070

/* Run network hooks */

2071

{

2072

if(mc.interfaces != NULL){

2073

interfaces_hooks = malloc(mc.interfaces_size);

2074

if(interfaces_hooks == NULL){

2075

perror_plus("malloc");

1608

errno = 0;

1609

ret = seteuid(0);

1610

if(ret == -1){

1611

perror_plus("seteuid");

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

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

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

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

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

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

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

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

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

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

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1659

}

1660

}

1661

1662

/* Find network hooks and run them */

1663

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

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

1667

alphasort);

1668

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

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

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

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

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

1686

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

1687

/* setenv( XXX more here */

1688

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

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

2076

1693

goto end;

2077

1694

}

2078

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

2079

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

2080

}

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

1695

}

1696

close(devnull);

2085

1697

}

2086

1698

2087

1699

if(not debug){

2088

1700

avahi_set_log_function(empty_log);

2089

1701

}

2090

1702

1703

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

1704

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1706

alphasort);

1707

if(ret >= 1){

1708

/* Pick the first good interface */

1709

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

1710

if(debug){

1711

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

1712

}

1713

if(interface == NULL){

1714

perror_plus("malloc");

1715

free(direntries);

1716

exitcode = EXIT_FAILURE;

1717

goto end;

1718

}

1719

free(direntries);

1720

} else {

1721

free(direntries);

1722

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

1723

exitcode = EXIT_FAILURE;

1724

goto end;

1725

}

1726

}

1727

2091

1728

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

2092

1729

from the signal handler */

2093

1730

/* Initialize the pseudo-RNG for Avahi */

2094

1731

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

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

2097

fprintf_plus(stderr,

2098

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

1732

mc.simple_poll = avahi_simple_poll_new();

1733

if(mc.simple_poll == NULL){

1734

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

2099

1735

exitcode = EX_UNAVAILABLE;

2100

1736

goto end;

2101

1737

}

2163

1799

}

2164

1800

}

2165

1801

2166

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

2167

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2169

/* Look for any good interfaces */

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2171

alphasort);

2172

if(ret >= 1){

2173

/* Add all found interfaces to interfaces list */

2174

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

2175

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

2176

direntries[i]->d_name);

2177

if(ret_errno != 0){

2178

errno = ret_errno;

2179

perror_plus("argz_add");

2180

continue;

2181

}

2182

if(debug){

2183

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

2184

direntries[i]->d_name);

2185

}

2186

}

2187

free(direntries);

1802

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

1803

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

1804

if_index = (AvahiIfIndex) if_nametoindex(interface);

1805

if(if_index == 0){

1806

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

1807

exitcode = EX_UNAVAILABLE;

1808

goto end;

1809

}

1810

1811

if(quit_now){

1812

goto end;

1813

}

1814

1815

/* Re-raise priviliges */

1816

errno = 0;

1817

ret = seteuid(0);

1818

if(ret == -1){

1819

perror_plus("seteuid");

1820

}

1821

1822

#ifdef __linux__

1823

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1824

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

1825

ret = klogctl(8, NULL, 5);

1826

bool restore_loglevel = true;

1827

if(ret == -1){

1828

restore_loglevel = false;

1829

perror_plus("klogctl");

1830

}

1831

#endif /* __linux__ */

1832

1833

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1834

if(sd < 0){

1835

perror_plus("socket");

1836

exitcode = EX_OSERR;

1837

#ifdef __linux__

1838

if(restore_loglevel){

1839

ret = klogctl(7, NULL, 0);

1840

if(ret == -1){

1841

perror_plus("klogctl");

1842

}

1843

}

1844

#endif /* __linux__ */

1845

/* Lower privileges */

1846

errno = 0;

1847

ret = seteuid(uid);

1848

if(ret == -1){

1849

perror_plus("seteuid");

1850

}

1851

goto end;

1852

}

1853

strcpy(network.ifr_name, interface);

1854

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

1855

if(ret == -1){

1856

perror_plus("ioctl SIOCGIFFLAGS");

1857

#ifdef __linux__

1858

if(restore_loglevel){

1859

ret = klogctl(7, NULL, 0);

1860

if(ret == -1){

1861

perror_plus("klogctl");

1862

}

1863

}

1864

#endif /* __linux__ */

1865

exitcode = EX_OSERR;

1866

/* Lower privileges */

1867

errno = 0;

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

goto end;

1873

}

1874

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

1875

network.ifr_flags |= IFF_UP;

1876

take_down_interface = true;

1877

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

1878

if(ret == -1){

1879

take_down_interface = false;

1880

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1881

exitcode = EX_OSERR;

1882

#ifdef __linux__

1883

if(restore_loglevel){

1884

ret = klogctl(7, NULL, 0);

1885

if(ret == -1){

1886

perror_plus("klogctl");

1887

}

1888

}

1889

#endif /* __linux__ */

1890

/* Lower privileges */

1891

errno = 0;

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

goto end;

1897

}

1898

}

1899

/* Sleep checking until interface is running.

1900

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

1901

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

1902

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

1903

if(ret == -1){

1904

perror_plus("ioctl SIOCGIFFLAGS");

1905

} else if(network.ifr_flags & IFF_RUNNING){

1906

break;

1907

}

1908

struct timespec sleeptime = { .tv_nsec = 250000000 };

1909

ret = nanosleep(&sleeptime, NULL);

1910

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

1911

perror_plus("nanosleep");

1912

}

1913

}

1914

if(not take_down_interface){

1915

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

1916

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

1917

if(ret == -1){

1918

perror_plus("close");

1919

}

1920

}

1921

#ifdef __linux__

1922

if(restore_loglevel){

1923

/* Restores kernel loglevel to default */

1924

ret = klogctl(7, NULL, 0);

1925

if(ret == -1){

1926

perror_plus("klogctl");

1927

}

1928

}

1929

#endif /* __linux__ */

1930

/* Lower privileges */

1931

errno = 0;

1932

if(take_down_interface){

1933

/* Lower privileges */

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

2188

1938

} else {

2189

free(direntries);

2190

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

2191

exitcode = EXIT_FAILURE;

2192

goto end;

2193

}

2194

}

2195

2196

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

2197

{

2198

char *interface = NULL;

2199

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

2200

interface))){

2201

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

2202

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

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

while((interface = argz_next(mc.interfaces,

2208

mc.interfaces_size, interface))){

2209

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

2210

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

2211

interface);

2212

interface = NULL;

2213

}

2214

}

2215

break;

2216

}

2217

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2219

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2222

perror_plus("Failed to bring up interface");

2223

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2229

perror_plus("argz_add");

2230

}

2231

}

2232

}

2233

}

2234

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

2235

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

2236

}

2237

}

2238

2239

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

2240

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

2241

if(debug){

2242

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

2243

mc.interfaces);

2244

}

2245

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

1939

/* Lower privileges permanently */

1940

ret = setuid(uid);

1941

if(ret == -1){

1942

perror_plus("setuid");

1943

}

1944

}

2246

1945

}

2247

1946

2248

1947

if(quit_now){

2249

1948

goto end;

2250

1949

}

2251

1950

2252

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

1951

ret = init_gnutls_global(pubkey, seckey);

2253

1952

if(ret == -1){

2254

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

1953

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

2255

1954

exitcode = EX_UNAVAILABLE;

2256

1955

goto end;

2257

1956

} else {

2272

1971

goto end;

2273

1972

}

2274

1973

2275

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

2276

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

1974

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

1975

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

2277

1976

exitcode = EX_UNAVAILABLE;

2278

1977

goto end;

2279

1978

} else {

2288

1987

/* Connect directly, do not use Zeroconf */

2289

1988

/* (Mainly meant for debugging) */

2290

1989

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

2291

2292

1990

if(address == NULL){

2293

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

1991

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

2294

1992

exitcode = EX_USAGE;

2295

1993

goto end;

2296

1994

}

2299

1997

goto end;

2300

1998

}

2301

1999

2302

in_port_t port;

2000

uint16_t port;

2303

2001

errno = 0;

2304

2002

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

2305

2003

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

2306

or tmpmax != (in_port_t)tmpmax){

2307

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

2004

or tmpmax != (uint16_t)tmpmax){

2005

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

2308

2006

exitcode = EX_USAGE;

2309

2007

goto end;

2310

2008

}

2311

2009

2312

2010

if(quit_now){

2313

2011

goto end;

2314

2012

}

2315

2013

2316

port = (in_port_t)tmpmax;

2014

port = (uint16_t)tmpmax;

2317

2015

*address = '\0';

2318

2016

/* Colon in address indicates IPv6 */

2319

2017

int af;

2335

2033

}

2336

2034

2337

2035

while(not quit_now){

2338

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

2339

&mc);

2036

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

2340

2037

if(quit_now or ret == 0){

2341

2038

break;

2342

2039

}

2343

2040

if(debug){

2344

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

2345

(int)retry_interval);

2041

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

2042

(int)retry_interval);

2346

2043

}

2347

sleep((unsigned int)retry_interval);

2044

sleep((int)retry_interval);

2348

2045

}

2349

2046

2350

2047

if (not quit_now){

2368

2065

config.publish_domain = 0;

2369

2066

2370

2067

/* Allocate a new server */

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

2068

mc.server = avahi_server_new(avahi_simple_poll_get

2069

(mc.simple_poll), &config, NULL,

2070

NULL, &error);

2373

2071

2374

2072

/* Free the Avahi configuration data */

2375

2073

avahi_server_config_free(&config);

2377

2075

2378

2076

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

2379

2077

if(mc.server == NULL){

2380

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

2381

avahi_strerror(ret_errno));

2078

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

2079

avahi_strerror(error));

2382

2080

exitcode = EX_UNAVAILABLE;

2383

2081

goto end;

2384

2082

}

2390

2088

/* Create the Avahi service browser */

2391

2089

sb = avahi_s_service_browser_new(mc.server, if_index,

2392

2090

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

2091

NULL, 0, browse_callback, NULL);

2395

2092

if(sb == NULL){

2396

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

2397

avahi_strerror(avahi_server_errno(mc.server)));

2093

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

2094

avahi_strerror(avahi_server_errno(mc.server)));

2398

2095

exitcode = EX_UNAVAILABLE;

2399

2096

goto end;

2400

2097

}

2406

2103

/* Run the main loop */

2407

2104

2408

2105

if(debug){

2409

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

2106

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

2410

2107

}

2411

2108

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

(int)(retry_interval * 1000));

2414

2111

if(debug){

2415

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

2416

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

2112

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

2113

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

2417

2114

}

2418

2115

2419

2116

end:

2420

2117

2421

2118

if(debug){

2422

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

2119

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

2423

2120

}

2424

2121

2425

2122

/* Cleanup things */

2426

free(mc.interfaces);

2427

2428

2123

if(sb != NULL)

2429

2124

avahi_s_service_browser_free(sb);

2430

2125

2431

2126

if(mc.server != NULL)

2432

2127

avahi_server_free(mc.server);

2433

2128

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

2129

if(mc.simple_poll != NULL)

2130

avahi_simple_poll_free(mc.simple_poll);

2436

2131

2437

2132

if(gnutls_initialized){

2438

2133

gnutls_certificate_free_credentials(mc.cred);

2443

2138

if(gpgme_initialized){

2444

2139

gpgme_release(mc.ctx);

2445

2140

}

2446

2141

2447

2142

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

2448

2143

has seen */

2449

2144

if(mc.current_server != NULL){

2455

2150

}

2456

2151

}

2457

2152

2458

/* Re-raise priviliges */

2459

{

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2153

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

2154

2155

/* Take down the network interface */

2156

if(take_down_interface){

2157

/* Re-raise priviliges */

2158

errno = 0;

2159

ret = seteuid(0);

2160

if(ret == -1){

2161

perror_plus("seteuid");

2162

}

2163

if(geteuid() == 0){

2164

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

2165

if(ret == -1){

2166

perror_plus("ioctl SIOCGIFFLAGS");

2167

} else if(network.ifr_flags & IFF_UP) {

2168

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

2169

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

2170

if(ret == -1){

2171

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2476

2172

}

2477

2173

}

2478

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

2479

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

2480

" down\n");

2174

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

2175

if(ret == -1){

2176

perror_plus("close");

2177

}

2178

/* Lower privileges permanently */

2179

errno = 0;

2180

ret = setuid(uid);

2181

if(ret == -1){

2182

perror_plus("setuid");

2481

2183

}

2482

2184

}

2483

2484

lower_privileges_permanently();

2485

2185

}

2486

2186

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2489

2490

2187

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

2491

2188

if(tempdir_created){

2492

2189

struct dirent **direntries = NULL;

2505

2202

}

2506

2203

ret = remove(fullname);

2507

2204

if(ret == -1){

2508

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

2509

strerror(errno));

2205

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

2206

strerror(errno));

2510

2207

}

2511

2208

free(fullname);

2512

2209

}