/mandos/release : revision 237.7.151

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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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* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@fukt.bsnet.se>.

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* Contact the authors at <mandos@recompile.se>.

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*/

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/* Needed by GPGME, specifically gpgme_data_seek() */

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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 */

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

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

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

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inet_pton(), connect() */

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause() */

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

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

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

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

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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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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uint16_t port;

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in_port_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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159

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 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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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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return buffer_capacity;

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}

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

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

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int af, server **current_server){

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int 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 -1;

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return false;

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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 -1;

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return false;

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}

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/* unique case of first server */

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if (mc.current_server == NULL){

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/* Special case of first server */

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if(*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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mc.current_server = new_server;

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

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*current_server = new_server;

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

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} else {

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new_server->next = mc.current_server;

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

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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->prev->next = new_server;

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mc.current_server->prev = new_server;

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(*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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ret = clock_gettime(CLOCK_MONOTONIC, &(*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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return false;

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}

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return 0;

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return true;

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245

}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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return false;

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}

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}

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if(debug){

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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return false;

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302

}

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

307

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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return false;

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}

292

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while(engine_info != NULL){

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317

engine_info = engine_info->next;

299

318

}

300

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if(engine_info == NULL){

301

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

320

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

321

tempdir);

302

322

return false;

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323

}

304

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305

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/* Create new GPGME "context" */

306

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

326

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

307

327

if(rc != GPG_ERR_NO_ERROR){

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

310

331

return false;

311

332

}

312

333

323

344

*/

324

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

325

346

size_t crypto_size,

326

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

327

349

gpgme_data_t dh_crypto, dh_plain;

328

350

gpgme_error_t rc;

329

351

ssize_t ret;

331

353

ssize_t plaintext_length = 0;

332

354

333

355

if(debug){

334

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

356

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

335

357

}

336

358

337

359

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

338

360

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

339

361

0);

340

362

if(rc != GPG_ERR_NO_ERROR){

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

343

365

return -1;

344

366

}

345

367

346

368

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

347

369

rc = gpgme_data_new(&dh_plain);

348

370

if(rc != GPG_ERR_NO_ERROR){

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

351

374

gpgme_data_release(dh_crypto);

352

375

return -1;

353

376

}

354

377

355

378

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

356

379

data buffer */

357

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

380

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

358

381

if(rc != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

361

384

plaintext_length = -1;

362

385

if(debug){

363

386

gpgme_decrypt_result_t result;

364

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

365

388

if(result == NULL){

366

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

389

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

367

390

} else {

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

372

395

if(result->file_name != NULL){

373

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

396

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

374

397

}

375

398

gpgme_recipient_t recipient;

376

399

recipient = result->recipients;

377

400

while(recipient != NULL){

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

384

408

recipient = recipient->next;

385

409

}

386

410

}

389

413

}

390

414

391

415

if(debug){

392

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

416

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

393

417

}

394

418

395

419

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

402

426

*plaintext = NULL;

403

427

while(true){

404

428

plaintext_capacity = incbuffer(plaintext,

405

(size_t)plaintext_length,

406

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

407

431

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

411

435

}

412

436

413

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

426

450

}

427

451

428

452

if(debug){

429

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

453

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

430

454

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

431

455

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

432

456

}

444

468

}

445

469

446

470

static const char * safer_gnutls_strerror(int value){

447

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

448

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

449

472

if(ret == NULL)

450

473

ret = "(unknown)";

451

474

return ret;

454

477

/* GnuTLS log function callback */

455

478

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

456

479

const char* string){

457

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

480

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

458

481

}

459

482

460

483

static int init_gnutls_global(const char *pubkeyfilename,

461

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

462

486

int ret;

463

487

464

488

if(debug){

465

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

489

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

466

490

}

467

491

468

492

ret = gnutls_global_init();

469

493

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

494

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

495

safer_gnutls_strerror(ret));

472

496

return -1;

473

497

}

474

498

481

505

}

482

506

483

507

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

509

if(ret != GNUTLS_E_SUCCESS){

486

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

487

safer_gnutls_strerror(ret));

510

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

511

safer_gnutls_strerror(ret));

488

512

gnutls_global_deinit();

489

513

return -1;

490

514

}

491

515

492

516

if(debug){

493

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

494

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

495

seckeyfilename);

517

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

496

521

}

497

522

498

523

ret = gnutls_certificate_set_openpgp_key_file

499

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

500

525

GNUTLS_OPENPGP_FMT_BASE64);

501

526

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

527

fprintf_plus(stderr,

528

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

529

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

530

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

531

safer_gnutls_strerror(ret));

507

532

goto globalfail;

508

533

}

509

534

510

535

/* GnuTLS server initialization */

511

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

512

537

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

515

541

goto globalfail;

516

542

}

517

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

543

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

518

544

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

521

547

goto globalfail;

522

548

}

523

549

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

525

551

526

552

return 0;

527

553

528

554

globalfail:

529

555

530

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

531

557

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

533

559

return -1;

534

560

}

535

561

536

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

537

564

int ret;

538

565

/* GnuTLS session creation */

539

566

do {

543

570

}

544

571

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

545

572

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

548

576

}

549

577

550

578

{

551

579

const char *err;

552

580

do {

553

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

581

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

554

582

if(quit_now){

555

583

gnutls_deinit(*session);

556

584

return -1;

557

585

}

558

586

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

559

587

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

588

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

589

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

590

safer_gnutls_strerror(ret));

563

591

gnutls_deinit(*session);

564

592

return -1;

565

593

}

567

595

568

596

do {

569

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

598

mc->cred);

571

599

if(quit_now){

572

600

gnutls_deinit(*session);

573

601

return -1;

574

602

}

575

603

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

576

604

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

579

607

gnutls_deinit(*session);

580

608

return -1;

581

609

}

583

611

/* ignore client certificate if any. */

584

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

585

613

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

615

588

616

return 0;

589

617

}

593

621

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

594

622

595

623

/* Called when a Mandos server is found */

596

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

624

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

597

625

AvahiIfIndex if_index,

598

int af){

626

int af, mandos_context *mc){

599

627

int ret, tcp_sd = -1;

600

628

ssize_t sret;

601

629

union {

626

654

pf = PF_INET;

627

655

break;

628

656

default:

629

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

657

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

630

658

errno = EINVAL;

631

659

return -1;

632

660

}

633

661

634

ret = init_gnutls_session(&session);

662

ret = init_gnutls_session(&session, mc);

635

663

if(ret != 0){

636

664

return -1;

637

665

}

638

666

639

667

if(debug){

640

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

641

"\n", ip, port);

668

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

669

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

642

670

}

643

671

644

672

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

698

}

671

699

if(ret == 0){

672

700

int e = errno;

673

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

701

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

674

702

errno = e;

675

703

goto mandos_end;

676

704

}

677

705

if(af == AF_INET6){

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

706

to.in6.sin6_port = htons(port);

682

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

708

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

684

-Wunreachable-code*/

709

-Wunreachable-code*/

685

710

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

711

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

712

" incomplete without a network interface\n");

688

713

errno = EINVAL;

689

714

goto mandos_end;

690

715

}

708

733

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

709

734

perror_plus("if_indextoname");

710

735

} else {

711

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

712

ip, interface, port);

736

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

737

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

713

738

}

714

739

} else {

715

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

716

port);

740

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

741

ip, (uintmax_t)port);

717

742

}

718

743

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

744

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

754

perror_plus("inet_ntop");

730

755

} else {

731

756

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

732

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

757

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

733

758

}

734

759

}

735

760

}

763

788

while(true){

764

789

size_t out_size = strlen(out);

765

790

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

766

out_size - written));

791

out_size - written));

767

792

if(ret == -1){

768

793

int e = errno;

769

794

perror_plus("write");

789

814

}

790

815

791

816

if(debug){

792

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

817

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

793

818

}

794

819

795

820

if(quit_now){

797

822

goto mandos_end;

798

823

}

799

824

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

825

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

826

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

827

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

828

gnutls_transport_set_ptr(session,

829

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

830

803

831

if(quit_now){

804

832

errno = EINTR;

815

843

816

844

if(ret != GNUTLS_E_SUCCESS){

817

845

if(debug){

818

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

846

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

819

847

gnutls_perror(ret);

820

848

}

821

849

errno = EPROTO;

825

853

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

826

854

827

855

if(debug){

828

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

829

ip);

856

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

857

" %s\n", ip);

830

858

}

831

859

832

860

while(true){

837

865

}

838

866

839

867

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

868

buffer_capacity);

841

869

if(buffer_capacity == 0){

842

870

int e = errno;

843

871

perror_plus("incbuffer");

870

898

}

871

899

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

872

900

if(ret < 0){

873

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

901

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

902

"***\n");

874

903

gnutls_perror(ret);

875

904

errno = EPROTO;

876

905

goto mandos_end;

877

906

}

878

907

break;

879

908

default:

880

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

881

" encrypted session with Mandos server\n");

909

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

910

" encrypted session with Mandos server\n");

882

911

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

912

errno = EIO;

884

913

goto mandos_end;

889

918

}

890

919

891

920

if(debug){

892

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

921

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

893

922

}

894

923

895

924

if(quit_now){

907

936

908

937

if(buffer_length > 0){

909

938

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

939

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer, mc);

913

941

if(decrypted_buffer_size >= 0){

914

942

915

943

written = 0;

925

953

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

926

954

int e = errno;

927

955

if(debug){

928

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

929

strerror(errno));

956

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

957

strerror(errno));

930

958

}

931

959

errno = e;

932

960

goto mandos_end;

976

1004

AVAHI_GCC_UNUSED AvahiStringList *txt,

977

1005

AVAHI_GCC_UNUSED AvahiLookupResultFlags

978

1006

flags,

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1007

void* mc){

1008

if(r == NULL){

1009

return;

1010

}

981

1011

982

1012

/* Called whenever a service has been resolved successfully or

983

1013

timed out */

989

1019

switch(event){

990

1020

default:

991

1021

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1022

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

1023

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

1024

domain,

1025

avahi_strerror(avahi_server_errno

1026

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

995

1027

break;

996

1028

997

1029

case AVAHI_RESOLVER_FOUND:

999

1031

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1032

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

1001

1033

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1034

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

1035

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

1036

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

1005

1037

}

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1038

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

1039

interface,

1040

avahi_proto_to_af(proto),

1041

mc);

1008

1042

if(ret == 0){

1009

avahi_simple_poll_quit(mc.simple_poll);

1043

avahi_simple_poll_quit(simple_poll);

1010

1044

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1045

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

1046

avahi_proto_to_af(proto),

1047

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

1048

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

1049

" list\n", name);

1050

}

1013

1051

}

1014

1052

}

1015

1053

}

1025

1063

const char *domain,

1026

1064

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1027

1065

flags,

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1066

void* mc){

1067

if(b == NULL){

1068

return;

1069

}

1030

1070

1031

1071

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

1032

1072

is removed from the LAN */

1039

1079

default:

1040

1080

case AVAHI_BROWSER_FAILURE:

1041

1081

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1082

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

1083

avahi_strerror(avahi_server_errno

1084

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

1085

avahi_simple_poll_quit(simple_poll);

1045

1086

return;

1046

1087

1047

1088

case AVAHI_BROWSER_NEW:

1050

1091

the callback function is called the Avahi server will free the

1051

1092

resolver for us. */

1052

1093

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

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

1057

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

1094

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

1095

interface, protocol, name, type,

1096

domain, protocol, 0,

1097

resolve_callback, mc) == NULL)

1098

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

1099

" %s\n", name,

1100

avahi_strerror(avahi_server_errno

1101

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

1058

1102

break;

1059

1103

1060

1104

case AVAHI_BROWSER_REMOVE:

1063

1107

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1108

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1109

if(debug){

1066

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

1110

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

1111

" searching...\n");

1067

1112

}

1068

1113

break;

1069

1114

}

1078

1123

signal_received = sig;

1079

1124

int old_errno = errno;

1080

1125

/* set main loop to exit */

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1126

if(simple_poll != NULL){

1127

avahi_simple_poll_quit(simple_poll);

1083

1128

}

1084

1129

errno = old_errno;

1085

1130

}

1086

1131

1132

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

1133

int ret;

1134

error_t ret_errno;

1135

1136

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

1137

if(s < 0){

1138

ret_errno = errno;

1139

perror_plus("socket");

1140

errno = ret_errno;

1141

return false;

1142

}

1143

strcpy(ifr->ifr_name, ifname);

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

if(ret == -1){

1146

if(debug){

1147

ret_errno = errno;

1148

perror_plus("ioctl SIOCGIFFLAGS");

1149

errno = ret_errno;

1150

}

1151

return false;

1152

}

1153

return true;

1154

}

1155

1156

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

1157

1158

/* Reject the loopback device */

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1160

if(debug){

1161

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

1162

ifname);

1163

}

1164

return false;

1165

}

1166

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

1167

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

1168

if(debug){

1169

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

1170

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

1171

}

1172

return true;

1173

}

1174

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

1175

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

1176

if(debug){

1177

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1178

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

1179

}

1180

return false;

1181

}

1182

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

1183

if(ifr->ifr_flags & IFF_NOARP){

1184

if(debug){

1185

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

1186

ifname);

1187

}

1188

return false;

1189

}

1190

1191

/* Accept this device */

1192

if(debug){

1193

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

1194

}

1195

return true;

1196

}

1197

1087

1198

/*

1088

1199

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

1089

1200

* corresponds to an acceptable network device.

1090

1201

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

1091

1202

*/

1092

1203

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

1204

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

1096

1205

return 0;

1097

1206

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1207

1208

struct ifreq ifr;

1209

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

1210

if(debug){

1211

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

1212

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

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1188

1219

}

1189

1220

return 1;

1190

1221

}

1191

1222

1223

/*

1224

* This function determines if a network interface is up.

1225

*/

1226

bool interface_is_up(const char *interface){

1227

struct ifreq ifr;

1228

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

1229

if(debug){

1230

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

1231

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

1232

}

1233

return false;

1234

}

1235

1236

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

1237

}

1238

1239

/*

1240

* This function determines if a network interface is running

1241

*/

1242

bool interface_is_running(const char *interface){

1243

struct ifreq ifr;

1244

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

1245

if(debug){

1246

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

1247

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

1248

}

1249

return false;

1250

}

1251

1252

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

1253

}

1254

1192

1255

int notdotentries(const struct dirent *direntry){

1193

1256

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

1194

1257

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

1200

1263

return 1;

1201

1264

}

1202

1265

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1266

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

1267

int runnable_hook(const struct dirent *direntry){

1268

int ret;

1269

size_t sret;

1270

struct stat st;

1271

1272

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

1273

/* Empty name? */

1274

return 0;

1275

}

1276

1277

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

1278

"abcdefghijklmnopqrstuvwxyz"

1279

"0123456789"

1280

"_-");

1281

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

1282

/* Contains non-allowed characters */

1283

if(debug){

1284

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

1285

direntry->d_name);

1286

}

1287

return 0;

1288

}

1289

1290

char *fullname = NULL;

1291

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

1292

if(ret < 0){

1293

perror_plus("asprintf");

1294

return 0;

1295

}

1296

1297

ret = stat(fullname, &st);

1298

if(ret == -1){

1299

if(debug){

1300

perror_plus("Could not stat hook");

1301

}

1302

return 0;

1303

}

1304

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

1305

/* Not a regular file */

1306

if(debug){

1307

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

1308

direntry->d_name);

1309

}

1310

return 0;

1311

}

1312

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

1313

/* Not executable */

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 0;

1319

}

1320

if(debug){

1321

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

1322

direntry->d_name);

1323

}

1324

return 1;

1325

}

1326

1327

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

mandos_context *mc){

1204

1329

int ret;

1205

1330

struct timespec now;

1206

1331

struct timespec waited_time;

1207

1332

intmax_t block_time;

1208

1333

1209

1334

while(true){

1210

if(mc.current_server == NULL){

1335

if(mc->current_server == NULL){

1211

1336

if (debug){

1212

fprintf(stderr,

1213

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

1337

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

1338

" No timeout!\n");

1214

1339

}

1215

1340

ret = avahi_simple_poll_iterate(s, -1);

1216

1341

} else {

1217

1342

if (debug){

1218

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

1219

" or wait\n");

1343

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

1344

" it, or wait\n");

1220

1345

}

1221

1346

/* the current time */

1222

1347

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1227

1352

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

1228

1353

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

1229

1354

waited_time.tv_sec = (now.tv_sec

1230

- mc.current_server->last_seen.tv_sec);

1355

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

1231

1356

waited_time.tv_nsec = (now.tv_nsec

1232

- mc.current_server->last_seen.tv_nsec);

1357

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

1233

1358

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

1234

1359

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

1235

1360

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

1236

1361

block_time = ((retry_interval

1237

1362

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

1238

1363

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

1239

1364

1240

1365

if (debug){

1241

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

1366

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

1367

block_time);

1242

1368

}

1243

1369

1244

1370

if(block_time <= 0){

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1371

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

1372

mc->current_server->port,

1373

mc->current_server->if_index,

1374

mc->current_server->af, mc);

1249

1375

if(ret == 0){

1250

avahi_simple_poll_quit(mc.simple_poll);

1376

avahi_simple_poll_quit(s);

1251

1377

return 0;

1252

1378

}

1253

1379

ret = clock_gettime(CLOCK_MONOTONIC,

1254

&mc.current_server->last_seen);

1380

&mc->current_server->last_seen);

1255

1381

if(ret == -1){

1256

1382

perror_plus("clock_gettime");

1257

1383

return -1;

1258

1384

}

1259

mc.current_server = mc.current_server->next;

1385

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

1260

1386

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

1261

1387

servers, but don't block */

1262

1388

}

1264

1390

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

1265

1391

}

1266

1392

if(ret != 0){

1267

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

1393

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

1268

1394

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

1269

1395

}

1270

1396

}

1271

1397

}

1272

1398

}

1273

1399

1400

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

1401

error_t raise_privileges(void){

1402

error_t old_errno = errno;

1403

error_t ret_errno = 0;

1404

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

1405

ret_errno = errno;

1406

perror_plus("seteuid");

1407

}

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

1412

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

1413

error_t raise_privileges_permanently(void){

1414

error_t old_errno = errno;

1415

error_t ret_errno = raise_privileges();

1416

if(ret_errno != 0){

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

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

1421

ret_errno = errno;

1422

perror_plus("seteuid");

1423

}

1424

errno = old_errno;

1425

return ret_errno;

1426

}

1427

1428

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

1429

error_t lower_privileges(void){

1430

error_t old_errno = errno;

1431

error_t ret_errno = 0;

1432

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

1433

ret_errno = errno;

1434

perror_plus("seteuid");

1435

}

1436

errno = old_errno;

1437

return ret_errno;

1438

}

1439

1440

/* Lower privileges permanently */

1441

error_t lower_privileges_permanently(void){

1442

error_t old_errno = errno;

1443

error_t ret_errno = 0;

1444

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

1445

ret_errno = errno;

1446

perror_plus("setuid");

1447

}

1448

errno = old_errno;

1449

return ret_errno;

1450

}

1451

1452

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

1453

const float delay){

1454

struct dirent **direntries;

1455

struct dirent *direntry;

1456

int ret;

1457

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

1458

alphasort);

1459

if(numhooks == -1){

1460

if(errno == ENOENT){

1461

if(debug){

1462

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

1463

" found\n", hookdir);

1464

}

1465

} else {

1466

perror_plus("scandir");

1467

}

1468

} else {

1469

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

1470

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

1471

direntry = direntries[i];

1472

char *fullname = NULL;

1473

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

1474

if(ret < 0){

1475

perror_plus("asprintf");

1476

continue;

1477

}

1478

if(debug){

1479

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

1480

direntry->d_name);

1481

}

1482

pid_t hook_pid = fork();

1483

if(hook_pid == 0){

1484

/* Child */

1485

/* Raise privileges */

1486

raise_privileges_permanently();

1487

/* Set group */

1488

errno = 0;

1489

ret = setgid(0);

1490

if(ret == -1){

1491

perror_plus("setgid");

1492

}

1493

/* Reset supplementary groups */

1494

errno = 0;

1495

ret = setgroups(0, NULL);

1496

if(ret == -1){

1497

perror_plus("setgroups");

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1502

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

1503

if(ret == -1){

1504

perror_plus("setenv");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

perror_plus("setenv");

1510

_exit(EX_OSERR);

1511

}

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

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

1518

if(ret == -1){

1519

perror_plus("setenv");

1520

_exit(EX_OSERR);

1521

}

1522

char *delaystring;

1523

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

1524

if(ret == -1){

1525

perror_plus("asprintf");

1526

_exit(EX_OSERR);

1527

}

1528

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

1529

if(ret == -1){

1530

free(delaystring);

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1534

free(delaystring);

1535

if(connect_to != NULL){

1536

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

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

}

1542

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

1543

perror_plus("execl");

1544

_exit(EXIT_FAILURE);

1545

}

1546

} else {

1547

int status;

1548

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

1549

perror_plus("waitpid");

1550

free(fullname);

1551

continue;

1552

}

1553

if(WIFEXITED(status)){

1554

if(WEXITSTATUS(status) != 0){

1555

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

1556

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

1557

WEXITSTATUS(status));

1558

free(fullname);

1559

continue;

1560

}

1561

} else if(WIFSIGNALED(status)){

1562

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

1563

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

1564

WTERMSIG(status));

1565

free(fullname);

1566

continue;

1567

} else {

1568

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

1569

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

1570

free(fullname);

1571

continue;

1572

}

1573

}

1574

free(fullname);

1575

if(debug){

1576

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

1577

direntry->d_name);

1578

}

1579

}

1580

close(devnull);

1581

}

1582

return true;

1583

}

1584

1585

error_t bring_up_interface(const char *const interface,

1586

const float delay){

1587

int sd = -1;

1588

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1591

struct ifreq network;

1592

unsigned int if_index = if_nametoindex(interface);

1593

if(if_index == 0){

1594

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

1595

errno = old_errno;

1596

return ENXIO;

1597

}

1598

1599

if(quit_now){

1600

errno = old_errno;

1601

return EINTR;

1602

}

1603

1604

if(not interface_is_up(interface)){

1605

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

1606

ret_errno = errno;

1607

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

1608

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

1609

return ret_errno;

1610

}

1611

network.ifr_flags |= IFF_UP;

1612

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1615

ret_errno = errno;

1616

perror_plus("socket");

1617

errno = old_errno;

1618

return ret_errno;

1619

}

1620

1621

if(quit_now){

1622

close(sd);

1623

errno = old_errno;

1624

return EINTR;

1625

}

1626

1627

if(debug){

1628

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

1629

interface);

1630

}

1631

1632

/* Raise priviliges */

1633

raise_privileges();

1634

1635

#ifdef __linux__

1636

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1637

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

1638

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

1639

bool restore_loglevel = true;

1640

if(ret_linux == -1){

1641

restore_loglevel = false;

1642

perror_plus("klogctl");

1643

}

1644

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

1647

#ifdef __linux__

1648

if(restore_loglevel){

1649

ret_linux = klogctl(7, NULL, 0);

1650

if(ret_linux == -1){

1651

perror_plus("klogctl");

1652

}

1653

}

1654

#endif /* __linux__ */

1655

1656

/* Lower privileges */

1657

lower_privileges();

1658

1659

/* Close the socket */

1660

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

1661

if(ret == -1){

1662

perror_plus("close");

1663

}

1664

1665

if(ret_setflags == -1){

1666

errno = ret_errno;

1667

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

errno = old_errno;

1669

return ret_errno;

1670

}

1671

} else if(debug){

1672

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

1673

interface);

1674

}

1675

1676

/* Sleep checking until interface is running.

1677

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

1678

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

1679

if(interface_is_running(interface)){

1680

break;

1681

}

1682

struct timespec sleeptime = { .tv_nsec = 250000000 };

1683

ret = nanosleep(&sleeptime, NULL);

1684

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

1685

perror_plus("nanosleep");

1686

}

1687

}

1688

1689

errno = old_errno;

1690

return 0;

1691

}

1692

1693

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1698

struct ifreq network;

1699

unsigned int if_index = if_nametoindex(interface);

1700

if(if_index == 0){

1701

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

1702

errno = old_errno;

1703

return ENXIO;

1704

}

1705

if(interface_is_up(interface)){

1706

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

1707

ret_errno = errno;

1708

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

1709

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

1710

return ret_errno;

1711

}

1712

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

1713

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1716

ret_errno = errno;

1717

perror_plus("socket");

1718

errno = old_errno;

1719

return ret_errno;

1720

}

1721

1722

if(debug){

1723

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

1724

interface);

1725

}

1726

1727

/* Raise priviliges */

1728

raise_privileges();

1729

1730

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

1731

ret_errno = errno;

1732

1733

/* Lower privileges */

1734

lower_privileges();

1735

1736

/* Close the socket */

1737

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

1738

if(ret == -1){

1739

perror_plus("close");

1740

}

1741

1742

if(ret_setflags == -1){

1743

errno = ret_errno;

1744

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

errno = old_errno;

1746

return ret_errno;

1747

}

1748

} else if(debug){

1749

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

1750

interface);

1751

}

1752

1753

errno = old_errno;

1754

return 0;

1755

}

1756

1274

1757

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

1758

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

1759

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

1760

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

1761

.interfaces = NULL, .interfaces_size = 0 };

1275

1762

AvahiSServiceBrowser *sb = NULL;

1276

int error;

1763

error_t ret_errno;

1277

1764

int ret;

1278

1765

intmax_t tmpmax;

1279

1766

char *tmp;

1280

1767

int exitcode = EXIT_SUCCESS;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1768

char *interfaces_to_take_down = NULL;

1769

size_t interfaces_to_take_down_size = 0;

1287

1770

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

1288

1771

bool tempdir_created = false;

1289

1772

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1290

1773

const char *seckey = PATHDIR "/" SECKEY;

1291

1774

const char *pubkey = PATHDIR "/" PUBKEY;

1775

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1292

1777

1293

1778

bool gnutls_initialized = false;

1294

1779

bool gpgme_initialized = false;

1356

1841

.group = 2 },

1357

1842

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

1358

1843

.arg = "SECONDS",

1359

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

1844

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

1845

.group = 2 },

1846

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

1847

.arg = "DIR",

1848

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

1360

1849

.group = 2 },

1361

1850

/*

1362

1851

* These reproduce what we would get without ARGP_NO_HELP

1381

1870

connect_to = arg;

1382

1871

break;

1383

1872

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

1384

interface = arg;

1873

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

1874

arg, (int)',');

1875

if(ret_errno != 0){

1876

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

1877

}

1385

1878

break;

1386

1879

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

1387

1880

seckey = arg;

1411

1904

errno = 0;

1412

1905

retry_interval = strtod(arg, &tmp);

1413

1906

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

1414

or (retry_interval * 1000) > INT_MAX){

1907

or (retry_interval * 1000) > INT_MAX

1908

or retry_interval < 0){

1415

1909

argp_error(state, "Bad retry interval");

1416

1910

}

1417

1911

break;

1912

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

1913

hookdir = arg;

1914

break;

1418

1915

/*

1419

1916

* These reproduce what we would get without ARGP_NO_HELP

1420

1917

*/

1426

1923

argp_state_help(state, state->out_stream,

1427

1924

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

1925

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

1429

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

1926

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

1430

1927

exit(argp_err_exit_status);

1431

1928

break;

1432

1929

default:

1459

1956

{

1460

1957

/* Work around Debian bug #633582:

1461

1958

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

1462

struct stat st;

1463

1959

1464

1960

/* Re-raise priviliges */

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1961

if(raise_privileges() == 0){

1962

struct stat st;

1963

1964

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

1965

int seckey_fd = open(seckey, O_RDONLY);

1966

if(seckey_fd == -1){

1967

perror_plus("open");

1968

} else {

1969

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

1970

if(ret == -1){

1971

perror_plus("fstat");

1972

} else {

1973

if(S_ISREG(st.st_mode)

1974

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

1975

ret = fchown(seckey_fd, uid, gid);

1976

if(ret == -1){

1977

perror_plus("fchown");

1978

}

1979

}

1980

}

1981

TEMP_FAILURE_RETRY(close(seckey_fd));

1982

}

1983

}

1984

1985

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

1986

int pubkey_fd = open(pubkey, O_RDONLY);

1987

if(pubkey_fd == -1){

1988

perror_plus("open");

1989

} else {

1990

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

1991

if(ret == -1){

1992

perror_plus("fstat");

1993

} else {

1994

if(S_ISREG(st.st_mode)

1995

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

1996

ret = fchown(pubkey_fd, uid, gid);

1997

if(ret == -1){

1998

perror_plus("fchown");

1999

}

2000

}

2001

}

2002

TEMP_FAILURE_RETRY(close(pubkey_fd));

2003

}

2004

}

2005

2006

/* Lower privileges */

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

2012

}

2013

}

2014

2015

/* Remove empty interface names */

2016

{

2017

char *interface = NULL;

2018

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

2019

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2022

fprintf_plus(stderr, "Not using nonexisting interface"

2023

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

2024

}

2025

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

2026

interface = NULL;

2027

}

2028

}

2029

}

2030

2031

/* Run network hooks */

2032

{

2033

2034

if(mc.interfaces != NULL){

2035

interfaces_hooks = malloc(mc.interfaces_size);

2036

if(interfaces_hooks == NULL){

2037

perror_plus("malloc");

2038

goto end;

2039

}

2040

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

2041

interfaces_hooks_size = mc.interfaces_size;

2042

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2043

(int)',');

2044

}

2045

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

2046

interfaces_hooks : "", delay)){

2047

goto end;

1512

2048

}

1513

2049

}

1514

2050

1515

2051

if(not debug){

1516

2052

avahi_set_log_function(empty_log);

1517

2053

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

1543

2054

1544

2055

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

1545

2056

from the signal handler */

1546

2057

/* Initialize the pseudo-RNG for Avahi */

1547

2058

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

1548

mc.simple_poll = avahi_simple_poll_new();

1549

if(mc.simple_poll == NULL){

1550

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

2059

simple_poll = avahi_simple_poll_new();

2060

if(simple_poll == NULL){

2061

fprintf_plus(stderr,

2062

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

1551

2063

exitcode = EX_UNAVAILABLE;

1552

2064

goto end;

1553

2065

}

1615

2127

}

1616

2128

}

1617

2129

1618

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

1619

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

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

if(if_index == 0){

1622

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

1623

exitcode = EX_UNAVAILABLE;

1624

goto end;

1625

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

#ifdef __linux__

1639

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1641

ret = klogctl(8, NULL, 5);

1642

bool restore_loglevel = true;

1643

if(ret == -1){

1644

restore_loglevel = false;

1645

perror_plus("klogctl");

1646

}

1647

#endif /* __linux__ */

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1653

#ifdef __linux__

1654

if(restore_loglevel){

1655

ret = klogctl(7, NULL, 0);

1656

if(ret == -1){

1657

perror_plus("klogctl");

1658

}

1659

}

1660

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

goto end;

1668

}

1669

strcpy(network.ifr_name, interface);

1670

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

1671

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1673

#ifdef __linux__

1674

if(restore_loglevel){

1675

ret = klogctl(7, NULL, 0);

1676

if(ret == -1){

1677

perror_plus("klogctl");

1678

}

1679

}

1680

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1688

goto end;

1689

}

1690

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

1691

network.ifr_flags |= IFF_UP;

1692

take_down_interface = true;

1693

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

1694

if(ret == -1){

1695

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1698

#ifdef __linux__

1699

if(restore_loglevel){

1700

ret = klogctl(7, NULL, 0);

1701

if(ret == -1){

1702

perror_plus("klogctl");

1703

}

1704

}

1705

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

goto end;

1713

}

1714

}

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

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

1719

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1721

} else if(network.ifr_flags & IFF_RUNNING){

1722

break;

1723

}

1724

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

ret = nanosleep(&sleeptime, NULL);

1726

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

1727

perror_plus("nanosleep");

1728

}

1729

}

1730

if(not take_down_interface){

1731

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

1732

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

1733

if(ret == -1){

1734

perror_plus("close");

1735

}

1736

}

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

/* Restores kernel loglevel to default */

1740

ret = klogctl(7, NULL, 0);

1741

if(ret == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

2130

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

2131

if(mc.interfaces == NULL){

2132

struct dirent **direntries;

2133

/* Look for any good interfaces */

2134

ret = scandir(sys_class_net, &direntries, good_interface,

2135

alphasort);

2136

if(ret >= 1){

2137

/* Add all found interfaces to interfaces list */

2138

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

2139

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

2140

direntries[i]->d_name);

2141

if(ret_errno != 0){

2142

perror_plus("argz_add");

2143

continue;

2144

}

2145

if(debug){

2146

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

2147

direntries[i]->d_name);

2148

}

2149

}

2150

free(direntries);

1754

2151

} else {

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

2152

free(direntries);

2153

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

2154

exitcode = EXIT_FAILURE;

2155

goto end;

2156

}

2157

}

2158

2159

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

2160

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

2161

if(debug){

2162

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

2163

mc.interfaces);

2164

}

2165

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

2166

}

2167

2168

/* Bring up interfaces which are down */

2169

if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1

2170

and strcmp(mc.interfaces, "none") == 0)){

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

bool interface_was_up = interface_is_up(interface);

2175

ret = bring_up_interface(interface, delay);

2176

if(not interface_was_up){

2177

if(ret != 0){

2178

errno = ret;

2179

perror_plus("Failed to bring up interface");

2180

} else {

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2184

}

1759

2185

}

1760

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2190

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

2191

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

2192

}

1761

2193

}

1762

2194

1763

2195

if(quit_now){

1764

2196

goto end;

1765

2197

}

1766

2198

1767

ret = init_gnutls_global(pubkey, seckey);

2199

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

1768

2200

if(ret == -1){

1769

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

2201

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

1770

2202

exitcode = EX_UNAVAILABLE;

1771

2203

goto end;

1772

2204

} else {

1787

2219

goto end;

1788

2220

}

1789

2221

1790

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

1791

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

2222

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

2223

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

1792

2224

exitcode = EX_UNAVAILABLE;

1793

2225

goto end;

1794

2226

} else {

1803

2235

/* Connect directly, do not use Zeroconf */

1804

2236

/* (Mainly meant for debugging) */

1805

2237

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

2238

1806

2239

if(address == NULL){

1807

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

2240

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

1808

2241

exitcode = EX_USAGE;

1809

2242

goto end;

1810

2243

}

1813

2246

goto end;

1814

2247

}

1815

2248

1816

uint16_t port;

2249

in_port_t port;

1817

2250

errno = 0;

1818

2251

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

1819

2252

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

1820

or tmpmax != (uint16_t)tmpmax){

1821

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

2253

or tmpmax != (in_port_t)tmpmax){

2254

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

1822

2255

exitcode = EX_USAGE;

1823

2256

goto end;

1824

2257

}

1827

2260

goto end;

1828

2261

}

1829

2262

1830

port = (uint16_t)tmpmax;

2263

port = (in_port_t)tmpmax;

1831

2264

*address = '\0';

1832

address = connect_to;

1833

2265

/* Colon in address indicates IPv6 */

1834

2266

int af;

1835

if(strchr(address, ':') != NULL){

2267

if(strchr(connect_to, ':') != NULL){

1836

2268

af = AF_INET6;

2269

/* Accept [] around IPv6 address - see RFC 5952 */

2270

if(connect_to[0] == '[' and address[-1] == ']')

2271

{

2272

connect_to++;

2273

address[-1] = '\0';

2274

}

1837

2275

} else {

1838

2276

af = AF_INET;

1839

2277

}

2278

address = connect_to;

1840

2279

1841

2280

if(quit_now){

1842

2281

goto end;

1843

2282

}

1844

2283

1845

2284

while(not quit_now){

1846

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

2285

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

2286

&mc);

1847

2287

if(quit_now or ret == 0){

1848

2288

break;

1849

2289

}

1850

sleep((int)retry_interval or 1);

1851

};

1852

2290

if(debug){

2291

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

2292

(int)retry_interval);

2293

}

2294

sleep((int)retry_interval);

2295

}

2296

1853

2297

if (not quit_now){

1854

2298

exitcode = EXIT_SUCCESS;

1855

2299

}

1856

2300

1857

2301

goto end;

1858

2302

}

1859

2303

1871

2315

config.publish_domain = 0;

1872

2316

1873

2317

/* Allocate a new server */

1874

mc.server = avahi_server_new(avahi_simple_poll_get

1875

(mc.simple_poll), &config, NULL,

1876

NULL, &error);

2318

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2319

&config, NULL, NULL, &ret_errno);

1877

2320

1878

2321

/* Free the Avahi configuration data */

1879

2322

avahi_server_config_free(&config);

1881

2324

1882

2325

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

1883

2326

if(mc.server == NULL){

1884

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

1885

avahi_strerror(error));

2327

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

2328

avahi_strerror(ret_errno));

1886

2329

exitcode = EX_UNAVAILABLE;

1887

2330

goto end;

1888

2331

}

1894

2337

/* Create the Avahi service browser */

1895

2338

sb = avahi_s_service_browser_new(mc.server, if_index,

1896

2339

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1897

NULL, 0, browse_callback, NULL);

2340

NULL, 0, browse_callback,

2341

(void *)&mc);

1898

2342

if(sb == NULL){

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2343

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

2344

avahi_strerror(avahi_server_errno(mc.server)));

1901

2345

exitcode = EX_UNAVAILABLE;

1902

2346

goto end;

1903

2347

}

1909

2353

/* Run the main loop */

1910

2354

1911

2355

if(debug){

1912

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

2356

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

1913

2357

}

1914

2358

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

2359

ret = avahi_loop_with_timeout(simple_poll,

2360

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

1917

2361

if(debug){

1918

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

1919

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

2362

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

2363

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

1920

2364

}

1921

2365

1922

2366

end:

1923

2367

1924

2368

if(debug){

1925

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

2369

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

1926

2370

}

1927

2371

1928

2372

/* Cleanup things */

1932

2376

if(mc.server != NULL)

1933

2377

avahi_server_free(mc.server);

1934

2378

1935

if(mc.simple_poll != NULL)

1936

avahi_simple_poll_free(mc.simple_poll);

2379

if(simple_poll != NULL)

2380

avahi_simple_poll_free(simple_poll);

1937

2381

1938

2382

if(gnutls_initialized){

1939

2383

gnutls_certificate_free_credentials(mc.cred);

1944

2388

if(gpgme_initialized){

1945

2389

gpgme_release(mc.ctx);

1946

2390

}

1947

2391

1948

2392

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

1949

2393

has seen */

1950

2394

if(mc.current_server != NULL){

1956

2400

}

1957

2401

}

1958

2402

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

1966

}

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2403

/* Re-raise priviliges */

2404

{

2405

raise_privileges();

2406

2407

/* Run network hooks */

2408

run_network_hooks("stop", interfaces_hooks != NULL ?

2409

interfaces_hooks : "", delay);

2410

2411

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

2412

{

2413

char *interface = NULL;

2414

while((interface=argz_next(interfaces_to_take_down,

2415

interfaces_to_take_down_size,

2416

interface))){

2417

ret_errno = take_down_interface(interface);

2418

if(ret_errno != 0){

2419

errno = ret_errno;

2420

perror_plus("Failed to take down interface");

1976

2421

}

1977

2422

}

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

2423

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

2424

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

2425

" down\n");

1987

2426

}

1988

2427

}

2428

2429

lower_privileges_permanently();

1989

2430

}

1990

2431

2432

free(interfaces_to_take_down);

2433

free(interfaces_hooks);

2434

1991

2435

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

1992

2436

if(tempdir_created){

1993

2437

struct dirent **direntries = NULL;

1994

2438

struct dirent *direntry = NULL;

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

2439

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

2440

alphasort);

2441

if (numentries > 0){

2442

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

1998

2443

direntry = direntries[i];

1999

2444

char *fullname = NULL;

2000

2445

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

2005

2450

}

2006

2451

ret = remove(fullname);

2007

2452

if(ret == -1){

2008

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

2009

strerror(errno));

2453

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

2454

strerror(errno));

2010

2455

}

2011

2456

free(fullname);

2012

2457

}

2013

2458

}

2014

2459

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2460

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

2017

2461

free(direntries);

2018

if (ret == -1){

2462

if (numentries == -1){

2019

2463

perror_plus("scandir");

2020

2464

}

2021

2465

ret = rmdir(tempdir);