/mandos/release : revision 237.11.2

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* "browse_callback", and parts of "main".

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*

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* Everything else is

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*

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* This program is free software: you can redistribute it and/or

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* modify it under the terms of the GNU General Public License as

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

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stdout, ferror(), remove() */

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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

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#include <stdint.h> /* uint16_t, uint32_t */

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#include <stddef.h> /* NULL, size_t, ssize_t */

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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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#include <sys/stat.h> /* open(), S_ISREG */

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#include <sys/stat.h> /* open() */

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#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect(),

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getnameinfo() */

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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#include <time.h> /* nanosleep(), time(), sleep() */

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*/

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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

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getuid(), getgid(), seteuid(),

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

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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#include <gpgme.h> /* All GPGME types, constants and

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#define PATHDIR "/conf/conf.d/mandos"

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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#define HOOKDIR "/lib/mandos/network-hooks.d"

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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const char * argp_program_version = "mandos-client " VERSION;

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

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const char *argp_program_version = "mandos-client " VERSION;

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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* Make additional room in "buffer" for at least BUFFER_SIZE more

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* bytes. "buffer_capacity" is how much is currently allocated,

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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

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if(buffer == NULL){

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return false;

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return -1;

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}

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*new_server = (server){ .ip = strdup(ip),

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return false;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return false;

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return -1;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

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} else {

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

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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*/

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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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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bool import_key(const char * const filename){

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bool import_key(const char *filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc->ctx, pgp_data);

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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/* Set GPGME home directory for the OpenPGP engine only */

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

324

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

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

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tempdir);

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

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return false;

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}

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/* Create new GPGME "context" */

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

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

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if(rc != GPG_ERR_NO_ERROR){

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

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

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gpgme_strerror(rc));

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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* Decrypt OpenPGP data.

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* Returns -1 on error

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*/

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__attribute__((nonnull, warn_unused_result))

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325

static ssize_t pgp_packet_decrypt(const char *cryptotext,

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size_t crypto_size,

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char **plaintext,

362

mandos_context *mc){

327

char **plaintext){

363

328

gpgme_data_t dh_crypto, dh_plain;

364

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gpgme_error_t rc;

365

330

ssize_t ret;

367

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ssize_t plaintext_length = 0;

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if(debug){

370

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

335

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

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}

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

374

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

375

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0);

376

341

if(rc != GPG_ERR_NO_ERROR){

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

379

344

return -1;

380

345

}

381

346

382

347

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

383

348

rc = gpgme_data_new(&dh_plain);

384

349

if(rc != GPG_ERR_NO_ERROR){

385

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

388

352

gpgme_data_release(dh_crypto);

389

353

return -1;

390

354

}

391

355

392

356

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

393

357

data buffer */

394

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

358

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

395

359

if(rc != GPG_ERR_NO_ERROR){

396

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

398

362

plaintext_length = -1;

399

363

if(debug){

400

364

gpgme_decrypt_result_t result;

401

result = gpgme_op_decrypt_result(mc->ctx);

365

result = gpgme_op_decrypt_result(mc.ctx);

402

366

if(result == NULL){

403

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

367

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

404

368

} else {

405

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

406

result->unsupported_algorithm);

407

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

408

result->wrong_key_usage);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

409

373

if(result->file_name != NULL){

410

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

374

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

411

375

}

412

376

gpgme_recipient_t recipient;

413

377

recipient = result->recipients;

414

378

while(recipient != NULL){

415

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

416

gpgme_pubkey_algo_name

417

(recipient->pubkey_algo));

418

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

419

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

420

recipient->status == GPG_ERR_NO_SECKEY

421

? "No" : "Yes");

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

422

385

recipient = recipient->next;

423

386

}

424

387

}

427

390

}

428

391

429

392

if(debug){

430

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

393

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

431

394

}

432

395

433

396

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

440

403

*plaintext = NULL;

441

404

while(true){

442

405

plaintext_capacity = incbuffer(plaintext,

443

(size_t)plaintext_length,

444

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

445

408

if(plaintext_capacity == 0){

446

perror_plus("incbuffer");

447

plaintext_length = -1;

448

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

449

412

}

450

413

451

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

464

427

}

465

428

466

429

if(debug){

467

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

430

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

468

431

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

469

432

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

470

433

}

481

444

return plaintext_length;

482

445

}

483

446

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

487

450

if(ret == NULL)

488

451

ret = "(unknown)";

489

452

return ret;

490

453

}

491

454

492

455

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

456

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

495

457

const char* string){

496

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

458

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

497

459

}

498

460

499

__attribute__((nonnull, warn_unused_result))

500

461

static int init_gnutls_global(const char *pubkeyfilename,

501

const char *seckeyfilename,

502

mandos_context *mc){

462

const char *seckeyfilename){

503

463

int ret;

504

464

505

465

if(debug){

506

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

466

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

507

467

}

508

468

509

469

ret = gnutls_global_init();

510

470

if(ret != GNUTLS_E_SUCCESS){

511

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

512

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

513

473

return -1;

514

474

}

515

475

522

482

}

523

483

524

484

/* OpenPGP credentials */

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

486

if(ret != GNUTLS_E_SUCCESS){

527

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

528

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

529

489

gnutls_global_deinit();

530

490

return -1;

531

491

}

532

492

533

493

if(debug){

534

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

494

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

495

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

496

seckeyfilename);

538

497

}

539

498

540

499

ret = gnutls_certificate_set_openpgp_key_file

541

(mc->cred, pubkeyfilename, seckeyfilename,

500

(mc.cred, pubkeyfilename, seckeyfilename,

542

501

GNUTLS_OPENPGP_FMT_BASE64);

543

502

if(ret != GNUTLS_E_SUCCESS){

544

fprintf_plus(stderr,

545

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

546

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

547

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

548

safer_gnutls_strerror(ret));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

549

508

goto globalfail;

550

509

}

551

510

552

511

/* GnuTLS server initialization */

553

ret = gnutls_dh_params_init(&mc->dh_params);

512

ret = gnutls_dh_params_init(&mc.dh_params);

554

513

if(ret != GNUTLS_E_SUCCESS){

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

514

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

515

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

558

516

goto globalfail;

559

517

}

560

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

518

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

561

519

if(ret != GNUTLS_E_SUCCESS){

562

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

563

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

564

522

goto globalfail;

565

523

}

566

524

567

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

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

526

569

527

return 0;

570

528

571

529

globalfail:

572

530

573

gnutls_certificate_free_credentials(mc->cred);

531

gnutls_certificate_free_credentials(mc.cred);

574

532

gnutls_global_deinit();

575

gnutls_dh_params_deinit(mc->dh_params);

533

gnutls_dh_params_deinit(mc.dh_params);

576

534

return -1;

577

535

}

578

536

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

537

static int init_gnutls_session(gnutls_session_t *session){

582

538

int ret;

583

539

/* GnuTLS session creation */

584

540

do {

588

544

}

589

545

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

590

546

if(ret != GNUTLS_E_SUCCESS){

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

594

549

}

595

550

596

551

{

597

552

const char *err;

598

553

do {

599

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

554

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

600

555

if(quit_now){

601

556

gnutls_deinit(*session);

602

557

return -1;

603

558

}

604

559

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

605

560

if(ret != GNUTLS_E_SUCCESS){

606

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

607

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

608

safer_gnutls_strerror(ret));

561

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

562

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

563

safer_gnutls_strerror(ret));

609

564

gnutls_deinit(*session);

610

565

return -1;

611

566

}

613

568

614

569

do {

615

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

616

mc->cred);

571

mc.cred);

617

572

if(quit_now){

618

573

gnutls_deinit(*session);

619

574

return -1;

620

575

}

621

576

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

622

577

if(ret != GNUTLS_E_SUCCESS){

623

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

624

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

625

580

gnutls_deinit(*session);

626

581

return -1;

627

582

}

629

584

/* ignore client certificate if any. */

630

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

631

586

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

588

634

589

return 0;

635

590

}

639

594

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

640

595

641

596

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

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

597

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

644

598

AvahiIfIndex if_index,

645

int af, mandos_context *mc){

599

int af){

646

600

int ret, tcp_sd = -1;

647

601

ssize_t sret;

648

struct sockaddr_storage to;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

649

606

char *buffer = NULL;

650

607

char *decrypted_buffer = NULL;

651

608

size_t buffer_length = 0;

670

627

pf = PF_INET;

671

628

break;

672

629

default:

673

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

630

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

674

631

errno = EINVAL;

675

632

return -1;

676

633

}

677

634

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

635

ret = init_gnutls_session(&session);

711

636

if(ret != 0){

712

637

return -1;

713

638

}

714

639

715

640

if(debug){

716

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

717

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

641

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

642

"\n", ip, port);

718

643

}

719

644

720

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

732

657

733

658

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

734

659

if(af == AF_INET6){

735

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

736

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

660

to.in6.sin6_family = (sa_family_t)af;

661

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

737

662

} else { /* IPv4 */

738

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

739

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

663

to.in.sin_family = (sa_family_t)af;

664

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

740

665

}

741

666

if(ret < 0 ){

742

667

int e = errno;

746

671

}

747

672

if(ret == 0){

748

673

int e = errno;

749

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

674

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

750

675

errno = e;

751

676

goto mandos_end;

752

677

}

753

678

if(af == AF_INET6){

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

757

686

if(if_index == AVAHI_IF_UNSPEC){

758

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

759

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

760

689

errno = EINVAL;

761

690

goto mandos_end;

762

691

}

763

692

/* Set the network interface number as scope */

764

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

693

to.in6.sin6_scope_id = (uint32_t)if_index;

765

694

}

766

695

} else {

767

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

696

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

697

-Wconversion and

698

-Wunreachable-code */

768

699

}

769

700

770

701

if(quit_now){

778

709

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

779

710

perror_plus("if_indextoname");

780

711

} else {

781

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

782

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

712

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

713

ip, interface, port);

783

714

}

784

715

} else {

785

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

786

ip, (uintmax_t)port);

716

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

717

port);

787

718

}

788

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

721

const char *pcret;

790

722

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

723

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

724

sizeof(addrstr));

795

725

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

726

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

727

sizeof(addrstr));

800

728

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

807

735

}

808

736

}

809

737

813

741

}

814

742

815

743

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

744

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

818

745

} else {

819

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

820

sizeof(struct sockaddr_in));

746

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

821

747

}

822

748

if(ret < 0){

823

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

749

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

824

750

int e = errno;

825

751

perror_plus("connect");

826

752

errno = e;

838

764

while(true){

839

765

size_t out_size = strlen(out);

840

766

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

841

out_size - written));

767

out_size - written));

842

768

if(ret == -1){

843

769

int e = errno;

844

770

perror_plus("write");

864

790

}

865

791

866

792

if(debug){

867

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

793

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

868

794

}

869

795

870

796

if(quit_now){

872

798

goto mandos_end;

873

799

}

874

800

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

880

803

881

804

if(quit_now){

882

805

errno = EINTR;

893

816

894

817

if(ret != GNUTLS_E_SUCCESS){

895

818

if(debug){

896

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

819

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

897

820

gnutls_perror(ret);

898

821

}

899

822

errno = EPROTO;

903

826

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

904

827

905

828

if(debug){

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

829

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

830

ip);

908

831

}

909

832

910

833

while(true){

915

838

}

916

839

917

840

buffer_capacity = incbuffer(&buffer, buffer_length,

918

buffer_capacity);

841

buffer_capacity);

919

842

if(buffer_capacity == 0){

920

843

int e = errno;

921

844

perror_plus("incbuffer");

948

871

}

949

872

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

950

873

if(ret < 0){

951

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

952

"***\n");

874

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

953

875

gnutls_perror(ret);

954

876

errno = EPROTO;

955

877

goto mandos_end;

956

878

}

957

879

break;

958

880

default:

959

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

960

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

961

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

962

884

errno = EIO;

963

885

goto mandos_end;

968

890

}

969

891

970

892

if(debug){

971

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

893

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

972

894

}

973

895

974

896

if(quit_now){

986

908

987

909

if(buffer_length > 0){

988

910

ssize_t decrypted_buffer_size;

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

991

914

if(decrypted_buffer_size >= 0){

992

915

993

916

written = 0;

1003

926

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

1004

927

int e = errno;

1005

928

if(debug){

1006

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

1007

strerror(errno));

929

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

930

strerror(errno));

1008

931

}

1009

932

errno = e;

1010

933

goto mandos_end;

1041

964

return retval;

1042

965

}

1043

966

1044

__attribute__((nonnull))

1045

967

static void resolve_callback(AvahiSServiceResolver *r,

1046

968

AvahiIfIndex interface,

1047

969

AvahiProtocol proto,

1055

977

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

979

flags,

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1062

982

1063

983

/* Called whenever a service has been resolved successfully or

1064

984

timed out */

1070

990

switch(event){

1071

991

default:

1072

992

case AVAHI_RESOLVER_FAILURE:

1073

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

1074

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

1075

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1078

996

break;

1079

997

1080

998

case AVAHI_RESOLVER_FOUND:

1082

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1083

1001

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

1084

1002

if(debug){

1085

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

1086

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

1087

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

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1088

1006

}

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1093

1009

if(ret == 0){

1094

avahi_simple_poll_quit(simple_poll);

1010

avahi_simple_poll_quit(mc.simple_poll);

1095

1011

} else {

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1102

1014

}

1103

1015

}

1104

1016

}

1114

1026

const char *domain,

1115

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1028

flags,

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1121

1031

1122

1032

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

1123

1033

is removed from the LAN */

1130

1040

default:

1131

1041

case AVAHI_BROWSER_FAILURE:

1132

1042

1133

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1137

1046

return;

1138

1047

1139

1048

case AVAHI_BROWSER_NEW:

1142

1051

the callback function is called the Avahi server will free the

1143

1052

resolver for us. */

1144

1053

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1149

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

1150

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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

1153

1059

break;

1154

1060

1155

1061

case AVAHI_BROWSER_REMOVE:

1158

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1159

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1160

1066

if(debug){

1161

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

1162

" searching...\n");

1067

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

1163

1068

}

1164

1069

break;

1165

1070

}

1174

1079

signal_received = sig;

1175

1080

int old_errno = errno;

1176

1081

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1179

1084

}

1180

1085

errno = old_errno;

1181

1086

}

1182

1087

1183

__attribute__((nonnull, warn_unused_result))

1184

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

1185

int ret;

1186

error_t ret_errno;

1187

1188

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

1189

if(s < 0){

1190

ret_errno = errno;

1191

perror_plus("socket");

1192

errno = ret_errno;

1193

return false;

1194

}

1195

strcpy(ifr->ifr_name, ifname);

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

if(ret == -1){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1198

1144

if(debug){

1199

ret_errno = errno;

1200

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1145

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

1146

flagstring, if_entry->d_name);

1202

1147

}

1203

return false;

1148

free(flagstring);

1149

return 0;

1204

1150

}

1205

return true;

1206

}

1207

1208

__attribute__((nonnull, warn_unused_result))

1209

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

1210

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1211

1153

/* Reject the loopback device */

1212

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1213

1155

if(debug){

1214

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

1215

ifname);

1156

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

1157

if_entry->d_name);

1216

1158

}

1217

return false;

1159

return 0;

1218

1160

}

1219

1161

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

1220

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

1162

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

1221

1163

if(debug){

1222

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

1223

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

1164

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

1165

if_entry->d_name);

1224

1166

}

1225

return true;

1167

return 1;

1226

1168

}

1227

1169

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

1228

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

1170

if(not (flags & IFF_BROADCAST)){

1229

1171

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1172

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

1173

if_entry->d_name);

1232

1174

}

1233

return false;

1175

return 0;

1234

1176

}

1235

1177

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

1236

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1237

1179

if(debug){

1238

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

1239

ifname);

1180

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

1181

if_entry->d_name);

1240

1182

}

1241

return false;

1183

return 0;

1242

1184

}

1243

1244

1185

/* Accept this device */

1245

1186

if(debug){

1246

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

1247

}

1248

return true;

1249

}

1250

1251

/*

1252

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

1253

* corresponds to an acceptable network device.

1254

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

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

int good_interface(const struct dirent *if_entry){

1258

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

1259

return 0;

1260

}

1261

1262

struct ifreq ifr;

1263

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

1264

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1187

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

1188

if_entry->d_name);

1273

1189

}

1274

1190

return 1;

1275

1191

}

1276

1192

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

1193

int notdotentries(const struct dirent *direntry){

1313

1194

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

1314

1195

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

1320

1201

return 1;

1321

1202

}

1322

1203

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1325

int runnable_hook(const struct dirent *direntry){

1326

int ret;

1327

size_t sret;

1328

struct stat st;

1329

1330

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

1331

/* Empty name? */

1332

return 0;

1333

}

1334

1335

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

1336

"abcdefghijklmnopqrstuvwxyz"

1337

"0123456789"

1338

"_-");

1339

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

1340

/* Contains non-allowed characters */

1341

if(debug){

1342

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

1343

direntry->d_name);

1344

}

1345

return 0;

1346

}

1347

1348

char *fullname = NULL;

1349

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

1350

if(ret < 0){

1351

perror_plus("asprintf");

1352

return 0;

1353

}

1354

1355

ret = stat(fullname, &st);

1356

if(ret == -1){

1357

if(debug){

1358

perror_plus("Could not stat hook");

1359

}

1360

return 0;

1361

}

1362

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

1363

/* Not a regular file */

1364

if(debug){

1365

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

1366

direntry->d_name);

1367

}

1368

return 0;

1369

}

1370

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

1371

/* Not executable */

1372

if(debug){

1373

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

1374

direntry->d_name);

1375

}

1376

return 0;

1377

}

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

return 1;

1383

}

1384

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1388

1205

int ret;

1389

1206

struct timespec now;

1390

1207

struct timespec waited_time;

1391

1208

intmax_t block_time;

1392

1209

1393

1210

while(true){

1394

if(mc->current_server == NULL){

1395

if(debug){

1396

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

1397

" No timeout!\n");

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1398

1215

}

1399

1216

ret = avahi_simple_poll_iterate(s, -1);

1400

1217

} else {

1401

if(debug){

1402

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

1403

" it, or wait\n");

1218

if (debug){

1219

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

1220

" or wait\n");

1404

1221

}

1405

1222

/* the current time */

1406

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1411

1228

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

1412

1229

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

1413

1230

waited_time.tv_sec = (now.tv_sec

1414

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

1231

- mc.current_server->last_seen.tv_sec);

1415

1232

waited_time.tv_nsec = (now.tv_nsec

1416

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

1233

- mc.current_server->last_seen.tv_nsec);

1417

1234

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

1418

1235

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

1419

1236

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

1421

1238

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

1422

1239

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

1423

1240

1424

if(debug){

1425

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

1426

block_time);

1241

if (debug){

1242

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

1427

1243

}

1428

1244

1429

1245

if(block_time <= 0){

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1434

1250

if(ret == 0){

1435

avahi_simple_poll_quit(s);

1251

avahi_simple_poll_quit(mc.simple_poll);

1436

1252

return 0;

1437

1253

}

1438

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1439

&mc->current_server->last_seen);

1255

&mc.current_server->last_seen);

1440

1256

if(ret == -1){

1441

1257

perror_plus("clock_gettime");

1442

1258

return -1;

1443

1259

}

1444

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

1260

mc.current_server = mc.current_server->next;

1445

1261

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

1446

1262

servers, but don't block */

1447

1263

}

1449

1265

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

1450

1266

}

1451

1267

if(ret != 0){

1452

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

1268

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

1453

1269

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

1454

1270

}

1455

1271

}

1456

1272

}

1457

1273

}

1458

1274

1459

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

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

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

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

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

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

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

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

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

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

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

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1515

__attribute__((nonnull))

1516

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

1517

const float delay){

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1521

if(numhooks == -1){

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

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

1534

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

1535

direntry = direntries[i];

1536

char *fullname = NULL;

1537

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

1538

if(ret < 0){

1539

perror_plus("asprintf");

1540

continue;

1541

}

1542

if(debug){

1543

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

1544

direntry->d_name);

1545

}

1546

pid_t hook_pid = fork();

1547

if(hook_pid == 0){

1548

/* Child */

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1583

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

1584

if(ret == -1){

1585

perror_plus("setenv");

1586

_exit(EX_OSERR);

1587

}

1588

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

1589

if(ret == -1){

1590

perror_plus("setenv");

1591

_exit(EX_OSERR);

1592

}

1593

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

1594

if(ret == -1){

1595

perror_plus("setenv");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

char *delaystring;

1604

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

1605

if(ret == -1){

1606

perror_plus("asprintf");

1607

_exit(EX_OSERR);

1608

}

1609

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

1610

if(ret == -1){

1611

free(delaystring);

1612

perror_plus("setenv");

1613

_exit(EX_OSERR);

1614

}

1615

free(delaystring);

1616

if(connect_to != NULL){

1617

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

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

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

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

1627

} else {

1628

int status;

1629

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

1630

perror_plus("waitpid");

1631

free(fullname);

1632

continue;

1633

}

1634

if(WIFEXITED(status)){

1635

if(WEXITSTATUS(status) != 0){

1636

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

1637

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

1638

WEXITSTATUS(status));

1639

free(fullname);

1640

continue;

1641

}

1642

} else if(WIFSIGNALED(status)){

1643

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

1644

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

1645

WTERMSIG(status));

1646

free(fullname);

1647

continue;

1648

} else {

1649

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

1650

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

1651

free(fullname);

1652

continue;

1653

}

1654

}

1655

free(fullname);

1656

if(debug){

1657

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

1658

direntry->d_name);

1659

}

1660

}

1661

close(devnull);

1662

}

1663

}

1664

1665

__attribute__((nonnull, warn_unused_result))

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

1669

int ret;

1670

struct ifreq network;

1671

unsigned int if_index = if_nametoindex(interface);

1672

if(if_index == 0){

1673

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

1674

errno = old_errno;

1675

return ENXIO;

1676

}

1677

1678

if(quit_now){

1679

errno = old_errno;

1680

return EINTR;

1681

}

1682

1683

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1686

ret_errno = errno;

1687

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

1688

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

1689

errno = old_errno;

1690

return ret_errno;

1691

}

1692

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

1693

1694

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

1695

if(sd == -1){

1696

ret_errno = errno;

1697

perror_plus("socket");

1698

errno = old_errno;

1699

return ret_errno;

1700

}

1701

1702

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1707

errno = old_errno;

1708

return EINTR;

1709

}

1710

1711

if(debug){

1712

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

1713

interface);

1714

}

1715

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1722

#ifdef __linux__

1723

int ret_linux;

1724

if(ret_errno == 0){

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1726

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

1727

ret_linux = klogctl(8, NULL, 5);

1728

if(ret_linux == -1){

1729

perror_plus("klogctl");

1730

} else {

1731

restore_loglevel = true;

1732

}

1733

}

1734

#endif /* __linux__ */

1735

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

1736

ioctl_errno = errno;

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

ret_linux = klogctl(7, NULL, 0);

1740

if(ret_linux == -1){

1741

perror_plus("klogctl");

1742

}

1743

}

1744

#endif /* __linux__ */

1745

1746

/* If raise_privileges() succeeded above */

1747

if(ret_errno == 0){

1748

/* Lower privileges */

1749

ret_errno = lower_privileges();

1750

if(ret_errno != 0){

1751

errno = ret_errno;

1752

perror_plus("Failed to lower privileges");

1753

}

1754

}

1755

1756

/* Close the socket */

1757

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

1758

if(ret == -1){

1759

perror_plus("close");

1760

}

1761

1762

if(ret_setflags == -1){

1763

errno = ioctl_errno;

1764

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1765

errno = old_errno;

1766

return ioctl_errno;

1767

}

1768

} else if(debug){

1769

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

1770

interface);

1771

}

1772

1773

/* Sleep checking until interface is running.

1774

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

1775

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

1776

if(interface_is_running(interface)){

1777

break;

1778

}

1779

struct timespec sleeptime = { .tv_nsec = 250000000 };

1780

ret = nanosleep(&sleeptime, NULL);

1781

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

1782

perror_plus("nanosleep");

1783

}

1784

}

1785

1786

errno = old_errno;

1787

return 0;

1788

}

1789

1790

__attribute__((nonnull, warn_unused_result))

1791

error_t take_down_interface(const char *const interface){

1792

error_t old_errno = errno;

1793

struct ifreq network;

1794

unsigned int if_index = if_nametoindex(interface);

1795

if(if_index == 0){

1796

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

1797

errno = old_errno;

1798

return ENXIO;

1799

}

1800

if(interface_is_up(interface)){

1801

error_t ret_errno = 0, ioctl_errno = 0;

1802

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

1803

ret_errno = errno;

1804

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

1805

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

1806

errno = old_errno;

1807

return ret_errno;

1808

}

1809

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

1810

1811

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

1812

if(sd == -1){

1813

ret_errno = errno;

1814

perror_plus("socket");

1815

errno = old_errno;

1816

return ret_errno;

1817

}

1818

1819

if(debug){

1820

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

1821

interface);

1822

}

1823

1824

/* Raise privileges */

1825

ret_errno = raise_privileges();

1826

if(ret_errno != 0){

1827

perror_plus("Failed to raise privileges");

1828

}

1829

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

1830

ioctl_errno = errno;

1831

1832

/* If raise_privileges() succeeded above */

1833

if(ret_errno == 0){

1834

/* Lower privileges */

1835

ret_errno = lower_privileges();

1836

if(ret_errno != 0){

1837

errno = ret_errno;

1838

perror_plus("Failed to lower privileges");

1839

}

1840

}

1841

1842

/* Close the socket */

1843

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

1844

if(ret == -1){

1845

perror_plus("close");

1846

}

1847

1848

if(ret_setflags == -1){

1849

errno = ioctl_errno;

1850

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1851

errno = old_errno;

1852

return ioctl_errno;

1853

}

1854

} else if(debug){

1855

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

1856

interface);

1857

}

1858

1859

errno = old_errno;

1860

return 0;

1861

}

1862

1863

1275

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

1864

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

1865

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

1866

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

1867

.interfaces = NULL, .interfaces_size = 0 };

1868

1276

AvahiSServiceBrowser *sb = NULL;

1869

error_t ret_errno;

1277

int error;

1870

1278

int ret;

1871

1279

intmax_t tmpmax;

1872

1280

char *tmp;

1873

1281

int exitcode = EXIT_SUCCESS;

1874

char *interfaces_to_take_down = NULL;

1875

size_t interfaces_to_take_down_size = 0;

1876

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1877

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

1878

char *tempdir = NULL;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1288

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

1289

bool tempdir_created = false;

1879

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1880

1291

const char *seckey = PATHDIR "/" SECKEY;

1881

1292

const char *pubkey = PATHDIR "/" PUBKEY;

1882

char *interfaces_hooks = NULL;

1883

1293

1884

1294

bool gnutls_initialized = false;

1885

1295

bool gpgme_initialized = false;

1947

1357

.group = 2 },

1948

1358

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

1949

1359

.arg = "SECONDS",

1950

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

1951

.group = 2 },

1952

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

1953

.arg = "DIR",

1954

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

1360

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

1955

1361

.group = 2 },

1956

1362

/*

1957

1363

* These reproduce what we would get without ARGP_NO_HELP

1976

1382

connect_to = arg;

1977

1383

break;

1978

1384

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

1979

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

1980

arg, (int)',');

1981

if(ret_errno != 0){

1982

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

1983

}

1385

interface = arg;

1984

1386

break;

1985

1387

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

1986

1388

seckey = arg;

2015

1417

argp_error(state, "Bad retry interval");

2016

1418

}

2017

1419

break;

2018

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

2019

hookdir = arg;

2020

break;

2021

1420

/*

2022

1421

* These reproduce what we would get without ARGP_NO_HELP

2023

1422

*/

2029

1428

argp_state_help(state, state->out_stream,

2030

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2031

1430

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

2032

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

1431

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

2033

1432

exit(argp_err_exit_status);

2034

1433

break;

2035

1434

default:

2062

1461

{

2063

1462

/* Work around Debian bug #633582:

2064

1463

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

2065

2066

/* Re-raise privileges */

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2070

perror_plus("Failed to raise privileges");

2071

} else {

2072

struct stat st;

2073

2074

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

2075

int seckey_fd = open(seckey, O_RDONLY);

2076

if(seckey_fd == -1){

2077

perror_plus("open");

2078

} else {

2079

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

2080

if(ret == -1){

2081

perror_plus("fstat");

2082

} else {

2083

if(S_ISREG(st.st_mode)

2084

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

2085

ret = fchown(seckey_fd, uid, gid);

2086

if(ret == -1){

2087

perror_plus("fchown");

2088

}

2089

}

2090

}

2091

TEMP_FAILURE_RETRY(close(seckey_fd));

2092

}

2093

}

2094

2095

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

2096

int pubkey_fd = open(pubkey, O_RDONLY);

2097

if(pubkey_fd == -1){

2098

perror_plus("open");

2099

} else {

2100

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

2101

if(ret == -1){

2102

perror_plus("fstat");

2103

} else {

2104

if(S_ISREG(st.st_mode)

2105

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

2106

ret = fchown(pubkey_fd, uid, gid);

2107

if(ret == -1){

2108

perror_plus("fchown");

2109

}

2110

}

2111

}

2112

TEMP_FAILURE_RETRY(close(pubkey_fd));

2113

}

2114

}

2115

2116

/* Lower privileges */

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2120

perror_plus("Failed to lower privileges");

2121

}

2122

}

2123

}

2124

2125

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

2126

{

2127

char *interface = NULL;

2128

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

2129

interface))){

2130

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

2131

and if_nametoindex(interface) == 0){

2132

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

2133

fprintf_plus(stderr, "Not using nonexisting interface"

2134

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

2135

}

2136

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

2137

interface = NULL;

2138

}

2139

}

2140

}

2141

2142

/* Run network hooks */

2143

{

2144

if(mc.interfaces != NULL){

2145

interfaces_hooks = malloc(mc.interfaces_size);

2146

if(interfaces_hooks == NULL){

2147

perror_plus("malloc");

2148

goto end;

2149

}

2150

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

2151

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

2152

}

2153

run_network_hooks("start", interfaces_hooks != NULL ?

2154

interfaces_hooks : "", delay);

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

2155

1519

}

2156

1520

2157

1521

if(not debug){

2158

1522

avahi_set_log_function(empty_log);

2159

1523

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

2160

1549

2161

1550

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

2162

1551

from the signal handler */

2163

1552

/* Initialize the pseudo-RNG for Avahi */

2164

1553

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

2165

simple_poll = avahi_simple_poll_new();

2166

if(simple_poll == NULL){

2167

fprintf_plus(stderr,

2168

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

1554

mc.simple_poll = avahi_simple_poll_new();

1555

if(mc.simple_poll == NULL){

1556

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

2169

1557

exitcode = EX_UNAVAILABLE;

2170

1558

goto end;

2171

1559

}

2233

1621

}

2234

1622

}

2235

1623

2236

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

2237

if(mc.interfaces == NULL){

2238

struct dirent **direntries;

2239

/* Look for any good interfaces */

2240

ret = scandir(sys_class_net, &direntries, good_interface,

2241

alphasort);

2242

if(ret >= 1){

2243

/* Add all found interfaces to interfaces list */

2244

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

2245

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

2246

direntries[i]->d_name);

2247

if(ret_errno != 0){

2248

errno = ret_errno;

2249

perror_plus("argz_add");

2250

continue;

2251

}

2252

if(debug){

2253

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

2254

direntries[i]->d_name);

2255

}

2256

}

2257

free(direntries);

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

1709

}

1710

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

break;

1729

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

2258

1760

} else {

2259

free(direntries);

2260

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

2261

exitcode = EXIT_FAILURE;

2262

goto end;

2263

}

2264

}

2265

2266

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

2267

{

2268

char *interface = NULL;

2269

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

2270

interface))){

2271

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

2272

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

2273

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

2274

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

2275

interface);

2276

interface = NULL;

2277

while((interface = argz_next(mc.interfaces,

2278

mc.interfaces_size, interface))){

2279

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

2280

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

2281

interface);

2282

interface = NULL;

2283

}

2284

}

2285

break;

2286

}

2287

bool interface_was_up = interface_is_up(interface);

2288

errno = bring_up_interface(interface, delay);

2289

if(not interface_was_up){

2290

if(errno != 0){

2291

perror_plus("Failed to bring up interface");

2292

} else {

2293

errno = argz_add(&interfaces_to_take_down,

2294

&interfaces_to_take_down_size,

2295

interface);

2296

if(errno != 0){

2297

perror_plus("argz_add");

2298

}

2299

}

2300

}

2301

}

2302

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

2303

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

2304

}

2305

}

2306

2307

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

2308

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

2309

if(debug){

2310

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

2311

mc.interfaces);

2312

}

2313

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

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

2314

1767

}

2315

1768

2316

1769

if(quit_now){

2317

1770

goto end;

2318

1771

}

2319

1772

2320

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

1773

ret = init_gnutls_global(pubkey, seckey);

2321

1774

if(ret == -1){

2322

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

1775

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

2323

1776

exitcode = EX_UNAVAILABLE;

2324

1777

goto end;

2325

1778

} else {

2330

1783

goto end;

2331

1784

}

2332

1785

2333

/* Try /run/tmp before /tmp */

2334

tempdir = mkdtemp(run_tempdir);

2335

if(tempdir == NULL and errno == ENOENT){

2336

if(debug){

2337

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2338

run_tempdir, old_tempdir);

2339

}

2340

tempdir = mkdtemp(old_tempdir);

2341

}

2342

if(tempdir == NULL){

1786

if(mkdtemp(tempdir) == NULL){

2343

1787

perror_plus("mkdtemp");

2344

1788

goto end;

2345

1789

}

1790

tempdir_created = true;

2346

1791

2347

1792

if(quit_now){

2348

1793

goto end;

2349

1794

}

2350

1795

2351

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

2352

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

1796

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

1797

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

2353

1798

exitcode = EX_UNAVAILABLE;

2354

1799

goto end;

2355

1800

} else {

2364

1809

/* Connect directly, do not use Zeroconf */

2365

1810

/* (Mainly meant for debugging) */

2366

1811

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

2367

2368

1812

if(address == NULL){

2369

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

1813

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

2370

1814

exitcode = EX_USAGE;

2371

1815

goto end;

2372

1816

}

2375

1819

goto end;

2376

1820

}

2377

1821

2378

in_port_t port;

1822

uint16_t port;

2379

1823

errno = 0;

2380

1824

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

2381

1825

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

2382

or tmpmax != (in_port_t)tmpmax){

2383

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2384

1828

exitcode = EX_USAGE;

2385

1829

goto end;

2386

1830

}

2387

1831

2388

1832

if(quit_now){

2389

1833

goto end;

2390

1834

}

2391

1835

2392

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2393

1837

*address = '\0';

2394

1838

/* Colon in address indicates IPv6 */

2395

1839

int af;

2411

1855

}

2412

1856

2413

1857

while(not quit_now){

2414

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

2415

&mc);

1858

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

2416

1859

if(quit_now or ret == 0){

2417

1860

break;

2418

1861

}

2419

1862

if(debug){

2420

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

2421

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2422

1865

}

2423

sleep((unsigned int)retry_interval);

1866

sleep((int)retry_interval);

2424

1867

}

2425

1868

2426

if(not quit_now){

1869

if (not quit_now){

2427

1870

exitcode = EXIT_SUCCESS;

2428

1871

}

2429

1872

2430

1873

goto end;

2431

1874

}

2432

1875

2444

1887

config.publish_domain = 0;

2445

1888

2446

1889

/* Allocate a new server */

2447

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2448

&config, NULL, NULL, &ret_errno);

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2449

1893

2450

1894

/* Free the Avahi configuration data */

2451

1895

avahi_server_config_free(&config);

2453

1897

2454

1898

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

2455

1899

if(mc.server == NULL){

2456

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

2457

avahi_strerror(ret_errno));

1900

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

1901

avahi_strerror(error));

2458

1902

exitcode = EX_UNAVAILABLE;

2459

1903

goto end;

2460

1904

}

2466

1910

/* Create the Avahi service browser */

2467

1911

sb = avahi_s_service_browser_new(mc.server, if_index,

2468

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2469

NULL, 0, browse_callback,

2470

(void *)&mc);

1913

NULL, 0, browse_callback, NULL);

2471

1914

if(sb == NULL){

2472

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

2473

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2474

1917

exitcode = EX_UNAVAILABLE;

2475

1918

goto end;

2476

1919

}

2482

1925

/* Run the main loop */

2483

1926

2484

1927

if(debug){

2485

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

1928

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

2486

1929

}

2487

1930

2488

ret = avahi_loop_with_timeout(simple_poll,

2489

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

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2490

1933

if(debug){

2491

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

2492

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

1934

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

1935

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

2493

1936

}

2494

1937

2495

1938

end:

2496

1939

2497

1940

if(debug){

2498

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

1941

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

2499

1942

}

2500

1943

2501

1944

/* Cleanup things */

2502

free(mc.interfaces);

2503

2504

1945

if(sb != NULL)

2505

1946

avahi_s_service_browser_free(sb);

2506

1947

2507

1948

if(mc.server != NULL)

2508

1949

avahi_server_free(mc.server);

2509

1950

2510

if(simple_poll != NULL)

2511

avahi_simple_poll_free(simple_poll);

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2512

1953

2513

1954

if(gnutls_initialized){

2514

1955

gnutls_certificate_free_credentials(mc.cred);

2519

1960

if(gpgme_initialized){

2520

1961

gpgme_release(mc.ctx);

2521

1962

}

2522

1963

2523

1964

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

2524

1965

has seen */

2525

1966

if(mc.current_server != NULL){

2531

1972

}

2532

1973

}

2533

1974

2534

/* Re-raise privileges */

2535

{

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

2538

perror_plus("Failed to raise privileges");

2539

} else {

2540

2541

/* Run network hooks */

2542

run_network_hooks("stop", interfaces_hooks != NULL ?

2543

interfaces_hooks : "", delay);

2544

2545

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

2546

{

2547

char *interface = NULL;

2548

while((interface=argz_next(interfaces_to_take_down,

2549

interfaces_to_take_down_size,

2550

interface))){

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

2554

perror_plus("Failed to take down interface");

2555

}

2556

}

2557

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

2558

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

2559

" down\n");

2560

}

2561

}

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

2562

1982

}

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

2565

perror_plus("Failed to lower privileges permanently");

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2566

2004

}

2567

2005

}

2568

2006

2569

free(interfaces_to_take_down);

2570

free(interfaces_hooks);

2571

2572

2007

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

2573

if(tempdir != NULL){

2008

if(tempdir_created){

2574

2009

struct dirent **direntries = NULL;

2575

2010

struct dirent *direntry = NULL;

2576

2011

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

2577

2012

alphasort);

2578

if(numentries > 0){

2013

if (numentries > 0){

2579

2014

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

2580

2015

direntry = direntries[i];

2581

2016

char *fullname = NULL;

2587

2022

}

2588

2023

ret = remove(fullname);

2589

2024

if(ret == -1){

2590

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

2591

strerror(errno));

2025

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

2026

strerror(errno));

2592

2027

}

2593

2028

free(fullname);

2594

2029

}

2596

2031

2597

2032

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

2598

2033

free(direntries);

2599

if(numentries == -1){

2034

if (numentries == -1){

2600

2035

perror_plus("scandir");

2601

2036

}

2602

2037

ret = rmdir(tempdir);