/mandos/release : revision 237.7.34

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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@recompile.se>.

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* Contact the authors at <mandos@fukt.bsnet.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, 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_bug_address = "<mandos@fukt.bsnet.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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180

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);

182

if(buffer == NULL){

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183

return 0;

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184

}

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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){

239

perror_plus("clock_gettime");

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return false;

241

}

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/* Special case of first server */

243

if(*current_server == NULL){

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return -1;

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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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209

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

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213

} 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);

220

if(ret == -1){

221

perror_plus("clock_gettime");

222

return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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*/

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__attribute__((nonnull, warn_unused_result))

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

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const char *tempdir, mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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

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rc = gpgme_get_engine_info(&engine_info);

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287

if(rc != GPG_ERR_NO_ERROR){

318

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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290

return false;

321

291

}

322

292

while(engine_info != NULL){

328

298

engine_info = engine_info->next;

329

299

}

330

300

if(engine_info == NULL){

331

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

332

tempdir);

301

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

333

302

return false;

334

303

}

335

304

336

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/* Create new GPGME "context" */

337

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

306

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

338

307

if(rc != GPG_ERR_NO_ERROR){

339

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

340

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

341

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

342

310

return false;

343

311

}

344

312

353

321

* Decrypt OpenPGP data.

354

322

* Returns -1 on error

355

323

*/

356

__attribute__((nonnull, warn_unused_result))

357

324

static ssize_t pgp_packet_decrypt(const char *cryptotext,

358

325

size_t crypto_size,

359

char **plaintext,

360

mandos_context *mc){

326

char **plaintext){

361

327

gpgme_data_t dh_crypto, dh_plain;

362

328

gpgme_error_t rc;

363

329

ssize_t ret;

365

331

ssize_t plaintext_length = 0;

366

332

367

333

if(debug){

368

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

334

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

369

335

}

370

336

371

337

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

372

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

373

339

0);

374

340

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

377

343

return -1;

378

344

}

379

345

380

346

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

381

347

rc = gpgme_data_new(&dh_plain);

382

348

if(rc != GPG_ERR_NO_ERROR){

383

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

384

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

385

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

386

351

gpgme_data_release(dh_crypto);

387

352

return -1;

388

353

}

389

354

390

355

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

391

356

data buffer */

392

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

357

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

393

358

if(rc != GPG_ERR_NO_ERROR){

394

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

395

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

396

361

plaintext_length = -1;

397

362

if(debug){

398

363

gpgme_decrypt_result_t result;

399

result = gpgme_op_decrypt_result(mc->ctx);

364

result = gpgme_op_decrypt_result(mc.ctx);

400

365

if(result == NULL){

401

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

366

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

402

367

} else {

403

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

404

result->unsupported_algorithm);

405

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

406

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

407

372

if(result->file_name != NULL){

408

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

373

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

409

374

}

410

375

gpgme_recipient_t recipient;

411

376

recipient = result->recipients;

412

377

while(recipient != NULL){

413

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

414

gpgme_pubkey_algo_name

415

(recipient->pubkey_algo));

416

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

417

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

418

recipient->status == GPG_ERR_NO_SECKEY

419

? "No" : "Yes");

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");

420

384

recipient = recipient->next;

421

385

}

422

386

}

425

389

}

426

390

427

391

if(debug){

428

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

392

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

429

393

}

430

394

431

395

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

438

402

*plaintext = NULL;

439

403

while(true){

440

404

plaintext_capacity = incbuffer(plaintext,

441

(size_t)plaintext_length,

442

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

443

407

if(plaintext_capacity == 0){

444

perror_plus("incbuffer");

445

plaintext_length = -1;

446

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

447

411

}

448

412

449

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

462

426

}

463

427

464

428

if(debug){

465

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

429

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

466

430

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

467

431

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

468

432

}

479

443

return plaintext_length;

480

444

}

481

445

482

__attribute__((warn_unused_result))

483

static const char *safer_gnutls_strerror(int value){

484

const char *ret = gnutls_strerror(value);

446

static const char * safer_gnutls_strerror(int value){

447

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

448

-Wunreachable-code */

485

449

if(ret == NULL)

486

450

ret = "(unknown)";

487

451

return ret;

488

452

}

489

453

490

454

/* GnuTLS log function callback */

491

__attribute__((nonnull))

492

455

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

493

456

const char* string){

494

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

457

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

495

458

}

496

459

497

__attribute__((nonnull, warn_unused_result))

498

460

static int init_gnutls_global(const char *pubkeyfilename,

499

const char *seckeyfilename,

500

mandos_context *mc){

461

const char *seckeyfilename){

501

462

int ret;

502

463

503

464

if(debug){

504

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

465

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

505

466

}

506

467

507

468

ret = gnutls_global_init();

508

469

if(ret != GNUTLS_E_SUCCESS){

509

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

510

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

511

472

return -1;

512

473

}

513

474

520

481

}

521

482

522

483

/* OpenPGP credentials */

523

ret = gnutls_certificate_allocate_credentials(&mc->cred);

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

524

485

if(ret != GNUTLS_E_SUCCESS){

525

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

526

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

527

488

gnutls_global_deinit();

528

489

return -1;

529

490

}

530

491

531

492

if(debug){

532

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

533

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

534

pubkeyfilename,

535

seckeyfilename);

493

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

494

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

495

seckeyfilename);

536

496

}

537

497

538

498

ret = gnutls_certificate_set_openpgp_key_file

539

(mc->cred, pubkeyfilename, seckeyfilename,

499

(mc.cred, pubkeyfilename, seckeyfilename,

540

500

GNUTLS_OPENPGP_FMT_BASE64);

541

501

if(ret != GNUTLS_E_SUCCESS){

542

fprintf_plus(stderr,

543

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

544

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

545

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

546

safer_gnutls_strerror(ret));

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));

547

507

goto globalfail;

548

508

}

549

509

550

510

/* GnuTLS server initialization */

551

ret = gnutls_dh_params_init(&mc->dh_params);

511

ret = gnutls_dh_params_init(&mc.dh_params);

552

512

if(ret != GNUTLS_E_SUCCESS){

553

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

554

" initialization: %s\n",

555

safer_gnutls_strerror(ret));

513

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

514

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

556

515

goto globalfail;

557

516

}

558

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

517

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

559

518

if(ret != GNUTLS_E_SUCCESS){

560

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

561

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

562

521

goto globalfail;

563

522

}

564

523

565

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

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

566

525

567

526

return 0;

568

527

569

528

globalfail:

570

529

571

gnutls_certificate_free_credentials(mc->cred);

530

gnutls_certificate_free_credentials(mc.cred);

572

531

gnutls_global_deinit();

573

gnutls_dh_params_deinit(mc->dh_params);

532

gnutls_dh_params_deinit(mc.dh_params);

574

533

return -1;

575

534

}

576

535

577

__attribute__((nonnull, warn_unused_result))

578

static int init_gnutls_session(gnutls_session_t *session,

579

mandos_context *mc){

536

static int init_gnutls_session(gnutls_session_t *session){

580

537

int ret;

581

538

/* GnuTLS session creation */

582

539

do {

586

543

}

587

544

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

588

545

if(ret != GNUTLS_E_SUCCESS){

589

fprintf_plus(stderr,

590

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

591

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

592

548

}

593

549

594

550

{

595

551

const char *err;

596

552

do {

597

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

553

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

598

554

if(quit_now){

599

555

gnutls_deinit(*session);

600

556

return -1;

601

557

}

602

558

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

603

559

if(ret != GNUTLS_E_SUCCESS){

604

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

605

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

606

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

607

563

gnutls_deinit(*session);

608

564

return -1;

609

565

}

611

567

612

568

do {

613

569

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

614

mc->cred);

570

mc.cred);

615

571

if(quit_now){

616

572

gnutls_deinit(*session);

617

573

return -1;

618

574

}

619

575

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

620

576

if(ret != GNUTLS_E_SUCCESS){

621

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

622

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

623

579

gnutls_deinit(*session);

624

580

return -1;

625

581

}

627

583

/* ignore client certificate if any. */

628

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

629

585

630

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

631

587

632

588

return 0;

633

589

}

637

593

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

638

594

639

595

/* Called when a Mandos server is found */

640

__attribute__((nonnull, warn_unused_result))

641

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

596

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

642

597

AvahiIfIndex if_index,

643

int af, mandos_context *mc){

598

int af){

644

599

int ret, tcp_sd = -1;

645

600

ssize_t sret;

646

struct sockaddr_storage to;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

647

605

char *buffer = NULL;

648

606

char *decrypted_buffer = NULL;

649

607

size_t buffer_length = 0;

668

626

pf = PF_INET;

669

627

break;

670

628

default:

671

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

629

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

672

630

errno = EINVAL;

673

631

return -1;

674

632

}

675

633

676

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

677

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

678

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

679

bool match = false;

680

{

681

char *interface = NULL;

682

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

683

interface))){

684

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

685

match = true;

686

break;

687

}

688

}

689

}

690

if(not match){

691

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

692

connect to the server */

693

if(debug){

694

char interface[IF_NAMESIZE];

695

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

696

perror_plus("if_indextoname");

697

} else {

698

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

699

" \"%s\"\n",

700

if_indextoname((unsigned int)if_index,

701

interface));

702

}

703

}

704

return -1;

705

}

706

}

707

708

ret = init_gnutls_session(&session, mc);

634

ret = init_gnutls_session(&session);

709

635

if(ret != 0){

710

636

return -1;

711

637

}

712

638

713

639

if(debug){

714

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

715

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

640

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

641

"\n", ip, port);

716

642

}

717

643

718

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

730

656

731

657

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

732

658

if(af == AF_INET6){

733

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

734

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

659

to.in6.sin6_family = (sa_family_t)af;

660

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

735

661

} else { /* IPv4 */

736

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

737

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

662

to.in.sin_family = (sa_family_t)af;

663

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

738

664

}

739

665

if(ret < 0 ){

740

666

int e = errno;

744

670

}

745

671

if(ret == 0){

746

672

int e = errno;

747

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

673

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

748

674

errno = e;

749

675

goto mandos_end;

750

676

}

751

677

if(af == AF_INET6){

752

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

753

if(IN6_IS_ADDR_LINKLOCAL

754

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

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

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

684

-Wunreachable-code*/

755

685

if(if_index == AVAHI_IF_UNSPEC){

756

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

757

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

758

688

errno = EINVAL;

759

689

goto mandos_end;

760

690

}

761

691

/* Set the network interface number as scope */

762

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

692

to.in6.sin6_scope_id = (uint32_t)if_index;

763

693

}

764

694

} else {

765

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

695

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

696

-Wconversion and

697

-Wunreachable-code */

766

698

}

767

699

768

700

if(quit_now){

776

708

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

777

709

perror_plus("if_indextoname");

778

710

} else {

779

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

780

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

711

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

712

ip, interface, port);

781

713

}

782

714

} else {

783

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

784

ip, (uintmax_t)port);

715

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

716

port);

785

717

}

786

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

787

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

720

const char *pcret;

788

721

if(af == AF_INET6){

789

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

790

sizeof(struct sockaddr_in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

722

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

723

sizeof(addrstr));

793

724

} else {

794

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

795

sizeof(struct sockaddr_in),

796

addrstr, sizeof(addrstr), NULL, 0,

797

NI_NUMERICHOST);

725

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

726

sizeof(addrstr));

798

727

}

799

if(ret == EAI_SYSTEM){

800

perror_plus("getnameinfo");

801

} else if(ret != 0) {

802

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

803

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

804

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

728

if(pcret == NULL){

729

perror_plus("inet_ntop");

730

} else {

731

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

732

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

733

}

805

734

}

806

735

}

807

736

811

740

}

812

741

813

742

if(af == AF_INET6){

814

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

815

sizeof(struct sockaddr_in6));

743

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

816

744

} else {

817

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

818

sizeof(struct sockaddr_in));

745

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

819

746

}

820

747

if(ret < 0){

821

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

748

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

822

749

int e = errno;

823

750

perror_plus("connect");

824

751

errno = e;

836

763

while(true){

837

764

size_t out_size = strlen(out);

838

765

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

839

out_size - written));

766

out_size - written));

840

767

if(ret == -1){

841

768

int e = errno;

842

769

perror_plus("write");

862

789

}

863

790

864

791

if(debug){

865

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

792

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

866

793

}

867

794

868

795

if(quit_now){

870

797

goto mandos_end;

871

798

}

872

799

873

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

874

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

875

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

876

gnutls_transport_set_ptr(session,

877

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

878

802

879

803

if(quit_now){

880

804

errno = EINTR;

891

815

892

816

if(ret != GNUTLS_E_SUCCESS){

893

817

if(debug){

894

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

818

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

895

819

gnutls_perror(ret);

896

820

}

897

821

errno = EPROTO;

901

825

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

902

826

903

827

if(debug){

904

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

905

" %s\n", ip);

828

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

829

ip);

906

830

}

907

831

908

832

while(true){

913

837

}

914

838

915

839

buffer_capacity = incbuffer(&buffer, buffer_length,

916

buffer_capacity);

840

buffer_capacity);

917

841

if(buffer_capacity == 0){

918

842

int e = errno;

919

843

perror_plus("incbuffer");

946

870

}

947

871

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

948

872

if(ret < 0){

949

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

950

"***\n");

873

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

951

874

gnutls_perror(ret);

952

875

errno = EPROTO;

953

876

goto mandos_end;

954

877

}

955

878

break;

956

879

default:

957

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

958

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

959

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

960

883

errno = EIO;

961

884

goto mandos_end;

966

889

}

967

890

968

891

if(debug){

969

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

892

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

970

893

}

971

894

972

895

if(quit_now){

984

907

985

908

if(buffer_length > 0){

986

909

ssize_t decrypted_buffer_size;

987

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

988

&decrypted_buffer, mc);

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

989

913

if(decrypted_buffer_size >= 0){

990

914

991

915

written = 0;

1001

925

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

1002

926

int e = errno;

1003

927

if(debug){

1004

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

1005

strerror(errno));

928

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

929

strerror(errno));

1006

930

}

1007

931

errno = e;

1008

932

goto mandos_end;

1039

963

return retval;

1040

964

}

1041

965

1042

__attribute__((nonnull))

1043

966

static void resolve_callback(AvahiSServiceResolver *r,

1044

967

AvahiIfIndex interface,

1045

968

AvahiProtocol proto,

1053

976

AVAHI_GCC_UNUSED AvahiStringList *txt,

1054

977

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

978

flags,

1056

void *mc){

1057

if(r == NULL){

1058

return;

1059

}

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1060

981

1061

982

/* Called whenever a service has been resolved successfully or

1062

983

timed out */

1068

989

switch(event){

1069

990

default:

1070

991

case AVAHI_RESOLVER_FAILURE:

1071

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

1072

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

1073

domain,

1074

avahi_strerror(avahi_server_errno

1075

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

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)));

1076

995

break;

1077

996

1078

997

case AVAHI_RESOLVER_FOUND:

1080

999

char ip[AVAHI_ADDRESS_STR_MAX];

1081

1000

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

1082

1001

if(debug){

1083

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

1084

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

1085

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

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);

1086

1005

}

1087

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

1088

interface,

1089

avahi_proto_to_af(proto),

1090

mc);

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1091

1008

if(ret == 0){

1092

avahi_simple_poll_quit(simple_poll);

1009

avahi_simple_poll_quit(mc.simple_poll);

1093

1010

} else {

1094

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

1095

avahi_proto_to_af(proto),

1096

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

1097

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

1098

" list\n", name);

1099

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1100

1013

}

1101

1014

}

1102

1015

}

1112

1025

const char *domain,

1113

1026

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1114

1027

flags,

1115

void *mc){

1116

if(b == NULL){

1117

return;

1118

}

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1119

1030

1120

1031

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

1121

1032

is removed from the LAN */

1128

1039

default:

1129

1040

case AVAHI_BROWSER_FAILURE:

1130

1041

1131

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

1132

avahi_strerror(avahi_server_errno

1133

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

1134

avahi_simple_poll_quit(simple_poll);

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1135

1045

return;

1136

1046

1137

1047

case AVAHI_BROWSER_NEW:

1140

1050

the callback function is called the Avahi server will free the

1141

1051

resolver for us. */

1142

1052

1143

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

1144

interface, protocol, name, type,

1145

domain, protocol, 0,

1146

resolve_callback, mc) == NULL)

1147

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

1148

" %s\n", name,

1149

avahi_strerror(avahi_server_errno

1150

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

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)));

1151

1058

break;

1152

1059

1153

1060

case AVAHI_BROWSER_REMOVE:

1156

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1157

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1158

1065

if(debug){

1159

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

1160

" searching...\n");

1066

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

1161

1067

}

1162

1068

break;

1163

1069

}

1172

1078

signal_received = sig;

1173

1079

int old_errno = errno;

1174

1080

/* set main loop to exit */

1175

if(simple_poll != NULL){

1176

avahi_simple_poll_quit(simple_poll);

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1177

1083

}

1178

1084

errno = old_errno;

1179

1085

}

1180

1086

1181

__attribute__((nonnull, warn_unused_result))

1182

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

1183

int ret;

1184

error_t ret_errno;

1185

1186

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

1187

if(s < 0){

1188

ret_errno = errno;

1189

perror_plus("socket");

1190

errno = ret_errno;

1191

return false;

1192

}

1193

strcpy(ifr->ifr_name, ifname);

1194

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1195

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

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){

1196

1143

if(debug){

1197

ret_errno = errno;

1198

perror_plus("ioctl SIOCGIFFLAGS");

1199

errno = ret_errno;

1144

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

1145

flagstring, if_entry->d_name);

1200

1146

}

1201

return false;

1147

free(flagstring);

1148

return 0;

1202

1149

}

1203

return true;

1204

}

1205

1206

__attribute__((nonnull, warn_unused_result))

1207

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

1208

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1209

1152

/* Reject the loopback device */

1210

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1211

1154

if(debug){

1212

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

1213

ifname);

1155

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

1156

if_entry->d_name);

1214

1157

}

1215

return false;

1158

return 0;

1216

1159

}

1217

1160

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

1218

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

1161

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

1219

1162

if(debug){

1220

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

1221

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

1163

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

1164

if_entry->d_name);

1222

1165

}

1223

return true;

1166

return 1;

1224

1167

}

1225

1168

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

1226

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

1169

if(not (flags & IFF_BROADCAST)){

1227

1170

if(debug){

1228

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1229

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

1171

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

1172

if_entry->d_name);

1230

1173

}

1231

return false;

1174

return 0;

1232

1175

}

1233

1176

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

1234

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1235

1178

if(debug){

1236

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

1237

ifname);

1179

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

1180

if_entry->d_name);

1238

1181

}

1239

return false;

1182

return 0;

1240

1183

}

1241

1242

1184

/* Accept this device */

1243

1185

if(debug){

1244

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

1245

}

1246

return true;

1247

}

1248

1249

/*

1250

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

1251

* corresponds to an acceptable network device.

1252

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

1253

*/

1254

__attribute__((nonnull, warn_unused_result))

1255

int good_interface(const struct dirent *if_entry){

1256

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

1257

return 0;

1258

}

1259

1260

struct ifreq ifr;

1261

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

1262

if(debug){

1263

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

1264

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

1265

}

1266

return 0;

1267

}

1268

1269

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

1270

return 0;

1186

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

1187

if_entry->d_name);

1271

1188

}

1272

1189

return 1;

1273

1190

}

1274

1191

1275

/*

1276

* This function determines if a network interface is up.

1277

*/

1278

__attribute__((nonnull, warn_unused_result))

1279

bool interface_is_up(const char *interface){

1280

struct ifreq ifr;

1281

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

1282

if(debug){

1283

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

1284

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

1285

}

1286

return false;

1287

}

1288

1289

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

1290

}

1291

1292

/*

1293

* This function determines if a network interface is running

1294

*/

1295

__attribute__((nonnull, warn_unused_result))

1296

bool interface_is_running(const char *interface){

1297

struct ifreq ifr;

1298

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

1299

if(debug){

1300

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

1301

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

1302

}

1303

return false;

1304

}

1305

1306

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

1307

}

1308

1309

__attribute__((nonnull, pure, warn_unused_result))

1310

1192

int notdotentries(const struct dirent *direntry){

1311

1193

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

1312

1194

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

1318

1200

return 1;

1319

1201

}

1320

1202

1321

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

1322

__attribute__((nonnull, warn_unused_result))

1323

int runnable_hook(const struct dirent *direntry){

1324

int ret;

1325

size_t sret;

1326

struct stat st;

1327

1328

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

1329

/* Empty name? */

1330

return 0;

1331

}

1332

1333

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

1334

"abcdefghijklmnopqrstuvwxyz"

1335

"0123456789"

1336

"_-");

1337

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

1338

/* Contains non-allowed characters */

1339

if(debug){

1340

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

1341

direntry->d_name);

1342

}

1343

return 0;

1344

}

1345

1346

char *fullname = NULL;

1347

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

1348

if(ret < 0){

1349

perror_plus("asprintf");

1350

return 0;

1351

}

1352

1353

ret = stat(fullname, &st);

1354

if(ret == -1){

1355

if(debug){

1356

perror_plus("Could not stat hook");

1357

}

1358

return 0;

1359

}

1360

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

1361

/* Not a regular file */

1362

if(debug){

1363

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

1364

direntry->d_name);

1365

}

1366

return 0;

1367

}

1368

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

1369

/* Not executable */

1370

if(debug){

1371

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

1372

direntry->d_name);

1373

}

1374

return 0;

1375

}

1376

if(debug){

1377

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

1378

direntry->d_name);

1379

}

1380

return 1;

1381

}

1382

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

1204

int ret;

1387

1205

struct timespec now;

1388

1206

struct timespec waited_time;

1389

1207

intmax_t block_time;

1390

1208

1391

1209

while(true){

1392

if(mc->current_server == NULL){

1393

if(debug){

1394

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

1395

" No timeout!\n");

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

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

1396

1214

}

1397

1215

ret = avahi_simple_poll_iterate(s, -1);

1398

1216

} else {

1399

if(debug){

1400

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

1401

" it, or wait\n");

1217

if (debug){

1218

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

1219

" or wait\n");

1402

1220

}

1403

1221

/* the current time */

1404

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1409

1227

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

1410

1228

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

1411

1229

waited_time.tv_sec = (now.tv_sec

1412

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

1230

- mc.current_server->last_seen.tv_sec);

1413

1231

waited_time.tv_nsec = (now.tv_nsec

1414

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

1232

- mc.current_server->last_seen.tv_nsec);

1415

1233

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

1416

1234

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

1417

1235

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

1418

1236

block_time = ((retry_interval

1419

1237

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

1420

1238

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

1421

1422

if(debug){

1423

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

1424

block_time);

1239

1240

if (debug){

1241

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

1425

1242

}

1426

1243

1427

1244

if(block_time <= 0){

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

mc->current_server->af, mc);

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);

1432

1249

if(ret == 0){

1433

avahi_simple_poll_quit(s);

1250

avahi_simple_poll_quit(mc.simple_poll);

1434

1251

return 0;

1435

1252

}

1436

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1437

&mc->current_server->last_seen);

1254

&mc.current_server->last_seen);

1438

1255

if(ret == -1){

1439

1256

perror_plus("clock_gettime");

1440

1257

return -1;

1441

1258

}

1442

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

1259

mc.current_server = mc.current_server->next;

1443

1260

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

1444

1261

servers, but don't block */

1445

1262

}

1447

1264

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

1448

1265

}

1449

1266

if(ret != 0){

1450

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

1267

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

1451

1268

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

1452

1269

}

1453

1270

}

1454

1271

}

1455

1272

}

1456

1273

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

perror_plus("seteuid");

1465

}

1466

errno = old_errno;

1467

return ret_errno;

1468

}

1469

1470

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

1471

__attribute__((warn_unused_result))

1472

error_t raise_privileges_permanently(void){

1473

error_t old_errno = errno;

1474

error_t ret_errno = raise_privileges();

1475

if(ret_errno != 0){

1476

errno = old_errno;

1477

return ret_errno;

1478

}

1479

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

1480

ret_errno = errno;

1481

perror_plus("seteuid");

1482

}

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

1487

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

1488

__attribute__((warn_unused_result))

1489

error_t lower_privileges(void){

1490

error_t old_errno = errno;

1491

error_t ret_errno = 0;

1492

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

1493

ret_errno = errno;

1494

perror_plus("seteuid");

1495

}

1496

errno = old_errno;

1497

return ret_errno;

1498

}

1499

1500

/* Lower privileges permanently */

1501

__attribute__((warn_unused_result))

1502

error_t lower_privileges_permanently(void){

1503

error_t old_errno = errno;

1504

error_t ret_errno = 0;

1505

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

1506

ret_errno = errno;

1507

perror_plus("setuid");

1508

}

1509

errno = old_errno;

1510

return ret_errno;

1511

}

1512

1513

__attribute__((nonnull))

1514

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

1515

const float delay){

1516

struct dirent **direntries;

1517

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

1518

alphasort);

1519

if(numhooks == -1){

1520

if(errno == ENOENT){

1521

if(debug){

1522

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

1523

" found\n", hookdir);

1524

}

1525

} else {

1526

perror_plus("scandir");

1527

}

1528

} else {

1529

struct dirent *direntry;

1530

int ret;

1531

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

1532

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

1533

direntry = direntries[i];

1534

char *fullname = NULL;

1535

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

1536

if(ret < 0){

1537

perror_plus("asprintf");

1538

continue;

1539

}

1540

if(debug){

1541

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

1542

direntry->d_name);

1543

}

1544

pid_t hook_pid = fork();

1545

if(hook_pid == 0){

1546

/* Child */

1547

/* Raise privileges */

1548

if(raise_privileges_permanently() != 0){

1549

perror_plus("Failed to raise privileges");

1550

_exit(EX_NOPERM);

1551

}

1552

/* Set group */

1553

errno = 0;

1554

ret = setgid(0);

1555

if(ret == -1){

1556

perror_plus("setgid");

1557

_exit(EX_NOPERM);

1558

}

1559

/* Reset supplementary groups */

1560

errno = 0;

1561

ret = setgroups(0, NULL);

1562

if(ret == -1){

1563

perror_plus("setgroups");

1564

_exit(EX_NOPERM);

1565

}

1566

ret = dup2(devnull, STDIN_FILENO);

1567

if(ret == -1){

1568

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

1569

_exit(EX_OSERR);

1570

}

1571

ret = close(devnull);

1572

if(ret == -1){

1573

perror_plus("close");

1574

_exit(EX_OSERR);

1575

}

1576

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1577

if(ret == -1){

1578

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

1579

_exit(EX_OSERR);

1580

}

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

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

1587

if(ret == -1){

1588

perror_plus("setenv");

1589

_exit(EX_OSERR);

1590

}

1591

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

1592

if(ret == -1){

1593

perror_plus("setenv");

1594

_exit(EX_OSERR);

1595

}

1596

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

1597

if(ret == -1){

1598

perror_plus("setenv");

1599

_exit(EX_OSERR);

1600

}

1601

char *delaystring;

1602

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

1603

if(ret == -1){

1604

perror_plus("asprintf");

1605

_exit(EX_OSERR);

1606

}

1607

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

1608

if(ret == -1){

1609

free(delaystring);

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

free(delaystring);

1614

if(connect_to != NULL){

1615

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

1616

if(ret == -1){

1617

perror_plus("setenv");

1618

_exit(EX_OSERR);

1619

}

1620

}

1621

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

1622

perror_plus("execl");

1623

_exit(EXIT_FAILURE);

1624

}

1625

} else {

1626

int status;

1627

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

1628

perror_plus("waitpid");

1629

free(fullname);

1630

continue;

1631

}

1632

if(WIFEXITED(status)){

1633

if(WEXITSTATUS(status) != 0){

1634

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

1635

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

1636

WEXITSTATUS(status));

1637

free(fullname);

1638

continue;

1639

}

1640

} else if(WIFSIGNALED(status)){

1641

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

1642

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

1643

WTERMSIG(status));

1644

free(fullname);

1645

continue;

1646

} else {

1647

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

1648

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

1649

free(fullname);

1650

continue;

1651

}

1652

}

1653

free(fullname);

1654

if(debug){

1655

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

1656

direntry->d_name);

1657

}

1658

}

1659

close(devnull);

1660

}

1661

}

1662

1663

__attribute__((nonnull, warn_unused_result))

1664

error_t bring_up_interface(const char *const interface,

1665

const float delay){

1666

error_t old_errno = errno;

1667

int ret;

1668

struct ifreq network;

1669

unsigned int if_index = if_nametoindex(interface);

1670

if(if_index == 0){

1671

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

1672

errno = old_errno;

1673

return ENXIO;

1674

}

1675

1676

if(quit_now){

1677

errno = old_errno;

1678

return EINTR;

1679

}

1680

1681

if(not interface_is_up(interface)){

1682

error_t ret_errno = 0, ioctl_errno = 0;

1683

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

1684

ret_errno = errno;

1685

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

1686

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

1687

errno = old_errno;

1688

return ret_errno;

1689

}

1690

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

1691

1692

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

1693

if(sd == -1){

1694

ret_errno = errno;

1695

perror_plus("socket");

1696

errno = old_errno;

1697

return ret_errno;

1698

}

1699

1700

if(quit_now){

1701

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

1702

if(ret == -1){

1703

perror_plus("close");

1704

}

1705

errno = old_errno;

1706

return EINTR;

1707

}

1708

1709

if(debug){

1710

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

1711

interface);

1712

}

1713

1714

/* Raise privileges */

1715

ret_errno = raise_privileges();

1716

bool restore_loglevel = false;

1717

if(ret_errno != 0){

1718

perror_plus("Failed to raise privileges");

1719

}

1720

#ifdef __linux__

1721

int ret_linux;

1722

if(ret_errno == 0){

1723

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1724

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

1725

ret_linux = klogctl(8, NULL, 5);

1726

if(ret_linux == -1){

1727

perror_plus("klogctl");

1728

} else {

1729

restore_loglevel = true;

1730

}

1731

}

1732

#endif /* __linux__ */

1733

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

1734

ioctl_errno = errno;

1735

#ifdef __linux__

1736

if(restore_loglevel){

1737

ret_linux = klogctl(7, NULL, 0);

1738

if(ret_linux == -1){

1739

perror_plus("klogctl");

1740

}

1741

}

1742

#endif /* __linux__ */

1743

1744

/* If raise_privileges() succeeded above */

1745

if(ret_errno == 0){

1746

/* Lower privileges */

1747

ret_errno = lower_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to lower privileges");

1751

}

1752

}

1753

1754

/* Close the socket */

1755

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

1756

if(ret == -1){

1757

perror_plus("close");

1758

}

1759

1760

if(ret_setflags == -1){

1761

errno = ioctl_errno;

1762

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1763

errno = old_errno;

1764

return ioctl_errno;

1765

}

1766

} else if(debug){

1767

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

1768

interface);

1769

}

1770

1771

/* Sleep checking until interface is running.

1772

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

1773

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

1774

if(interface_is_running(interface)){

1775

break;

1776

}

1777

struct timespec sleeptime = { .tv_nsec = 250000000 };

1778

ret = nanosleep(&sleeptime, NULL);

1779

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

1780

perror_plus("nanosleep");

1781

}

1782

}

1783

1784

errno = old_errno;

1785

return 0;

1786

}

1787

1788

__attribute__((nonnull, warn_unused_result))

1789

error_t take_down_interface(const char *const interface){

1790

error_t old_errno = errno;

1791

struct ifreq network;

1792

unsigned int if_index = if_nametoindex(interface);

1793

if(if_index == 0){

1794

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

1795

errno = old_errno;

1796

return ENXIO;

1797

}

1798

if(interface_is_up(interface)){

1799

error_t ret_errno = 0, ioctl_errno = 0;

1800

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

1801

ret_errno = errno;

1802

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

1803

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

1804

errno = old_errno;

1805

return ret_errno;

1806

}

1807

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

1808

1809

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

1810

if(sd == -1){

1811

ret_errno = errno;

1812

perror_plus("socket");

1813

errno = old_errno;

1814

return ret_errno;

1815

}

1816

1817

if(debug){

1818

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

1819

interface);

1820

}

1821

1822

/* Raise privileges */

1823

ret_errno = raise_privileges();

1824

if(ret_errno != 0){

1825

perror_plus("Failed to raise privileges");

1826

}

1827

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

1828

ioctl_errno = errno;

1829

1830

/* If raise_privileges() succeeded above */

1831

if(ret_errno == 0){

1832

/* Lower privileges */

1833

ret_errno = lower_privileges();

1834

if(ret_errno != 0){

1835

errno = ret_errno;

1836

perror_plus("Failed to lower privileges");

1837

}

1838

}

1839

1840

/* Close the socket */

1841

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

1842

if(ret == -1){

1843

perror_plus("close");

1844

}

1845

1846

if(ret_setflags == -1){

1847

errno = ioctl_errno;

1848

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1849

errno = old_errno;

1850

return ioctl_errno;

1851

}

1852

} else if(debug){

1853

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

1854

interface);

1855

}

1856

1857

errno = old_errno;

1858

return 0;

1859

}

1860

1861

1274

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

1862

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

1863

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

1864

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

1865

.interfaces = NULL, .interfaces_size = 0 };

1866

1275

AvahiSServiceBrowser *sb = NULL;

1867

error_t ret_errno;

1276

int error;

1868

1277

int ret;

1869

1278

intmax_t tmpmax;

1870

1279

char *tmp;

1871

1280

int exitcode = EXIT_SUCCESS;

1872

char *interfaces_to_take_down = NULL;

1873

size_t interfaces_to_take_down_size = 0;

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;

1874

1287

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

1875

1288

bool tempdir_created = false;

1876

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1877

1290

const char *seckey = PATHDIR "/" SECKEY;

1878

1291

const char *pubkey = PATHDIR "/" PUBKEY;

1879

char *interfaces_hooks = NULL;

1880

1292

1881

1293

bool gnutls_initialized = false;

1882

1294

bool gpgme_initialized = false;

1944

1356

.group = 2 },

1945

1357

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

1946

1358

.arg = "SECONDS",

1947

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

1948

.group = 2 },

1949

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

1950

.arg = "DIR",

1951

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

1359

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

1952

1360

.group = 2 },

1953

1361

/*

1954

1362

* These reproduce what we would get without ARGP_NO_HELP

1973

1381

connect_to = arg;

1974

1382

break;

1975

1383

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

1976

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

1977

arg, (int)',');

1978

if(ret_errno != 0){

1979

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

1980

}

1384

interface = arg;

1981

1385

break;

1982

1386

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

1983

1387

seckey = arg;

2007

1411

errno = 0;

2008

1412

retry_interval = strtod(arg, &tmp);

2009

1413

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

2010

or (retry_interval * 1000) > INT_MAX

2011

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

2012

1415

argp_error(state, "Bad retry interval");

2013

1416

}

2014

1417

break;

2015

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

2016

hookdir = arg;

2017

break;

2018

1418

/*

2019

1419

* These reproduce what we would get without ARGP_NO_HELP

2020

1420

*/

2026

1426

argp_state_help(state, state->out_stream,

2027

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2028

1428

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

2029

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

1429

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

2030

1430

exit(argp_err_exit_status);

2031

1431

break;

2032

1432

default:

2055

1455

goto end;

2056

1456

}

2057

1457

}

2058

2059

{

2060

/* Work around Debian bug #633582:

2061

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

2062

2063

/* Re-raise privileges */

2064

ret_errno = raise_privileges();

2065

if(ret_errno != 0){

2066

errno = ret_errno;

2067

perror_plus("Failed to raise privileges");

2068

} else {

2069

struct stat st;

2070

2071

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

2072

int seckey_fd = open(seckey, O_RDONLY);

2073

if(seckey_fd == -1){

2074

perror_plus("open");

2075

} else {

2076

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

2077

if(ret == -1){

2078

perror_plus("fstat");

2079

} else {

2080

if(S_ISREG(st.st_mode)

2081

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

2082

ret = fchown(seckey_fd, uid, gid);

2083

if(ret == -1){

2084

perror_plus("fchown");

2085

}

2086

}

2087

}

2088

TEMP_FAILURE_RETRY(close(seckey_fd));

2089

}

2090

}

2091

2092

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

2093

int pubkey_fd = open(pubkey, O_RDONLY);

2094

if(pubkey_fd == -1){

2095

perror_plus("open");

2096

} else {

2097

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

2098

if(ret == -1){

2099

perror_plus("fstat");

2100

} else {

2101

if(S_ISREG(st.st_mode)

2102

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

2103

ret = fchown(pubkey_fd, uid, gid);

2104

if(ret == -1){

2105

perror_plus("fchown");

2106

}

2107

}

2108

}

2109

TEMP_FAILURE_RETRY(close(pubkey_fd));

2110

}

2111

}

2112

2113

/* Lower privileges */

2114

ret_errno = lower_privileges();

2115

if(ret_errno != 0){

2116

errno = ret_errno;

2117

perror_plus("Failed to lower privileges");

2118

}

2119

}

2120

}

2121

2122

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

2123

{

2124

char *interface = NULL;

2125

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

2126

interface))){

2127

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

2128

and if_nametoindex(interface) == 0){

2129

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

2130

fprintf_plus(stderr, "Not using nonexisting interface"

2131

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

2132

}

2133

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

2134

interface = NULL;

2135

}

2136

}

2137

}

2138

2139

/* Run network hooks */

2140

{

2141

if(mc.interfaces != NULL){

2142

interfaces_hooks = malloc(mc.interfaces_size);

2143

if(interfaces_hooks == NULL){

2144

perror_plus("malloc");

2145

goto end;

2146

}

2147

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

2148

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

2149

}

2150

run_network_hooks("start", interfaces_hooks != NULL ?

2151

interfaces_hooks : "", delay);

2152

}

2153

1458

2154

1459

if(not debug){

2155

1460

avahi_set_log_function(empty_log);

2156

1461

}

1462

1463

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

1464

struct dirent **direntries;

1465

ret = scandir(sys_class_net, &direntries, good_interface,

1466

alphasort);

1467

if(ret >= 1){

1468

/* Pick the first good interface */

1469

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

1470

if(debug){

1471

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

1472

}

1473

if(interface == NULL){

1474

perror_plus("malloc");

1475

free(direntries);

1476

exitcode = EXIT_FAILURE;

1477

goto end;

1478

}

1479

free(direntries);

1480

} else {

1481

free(direntries);

1482

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

1483

exitcode = EXIT_FAILURE;

1484

goto end;

1485

}

1486

}

2157

1487

2158

1488

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

2159

1489

from the signal handler */

2160

1490

/* Initialize the pseudo-RNG for Avahi */

2161

1491

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

2162

simple_poll = avahi_simple_poll_new();

2163

if(simple_poll == NULL){

2164

fprintf_plus(stderr,

2165

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

1492

mc.simple_poll = avahi_simple_poll_new();

1493

if(mc.simple_poll == NULL){

1494

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

2166

1495

exitcode = EX_UNAVAILABLE;

2167

1496

goto end;

2168

1497

}

2230

1559

}

2231

1560

}

2232

1561

2233

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

2234

if(mc.interfaces == NULL){

2235

struct dirent **direntries;

2236

/* Look for any good interfaces */

2237

ret = scandir(sys_class_net, &direntries, good_interface,

2238

alphasort);

2239

if(ret >= 1){

2240

/* Add all found interfaces to interfaces list */

2241

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

2242

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

2243

direntries[i]->d_name);

2244

if(ret_errno != 0){

2245

errno = ret_errno;

2246

perror_plus("argz_add");

2247

continue;

2248

}

2249

if(debug){

2250

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

2251

direntries[i]->d_name);

2252

}

2253

}

2254

free(direntries);

1562

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

1563

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

1564

if_index = (AvahiIfIndex) if_nametoindex(interface);

1565

if(if_index == 0){

1566

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

1567

exitcode = EX_UNAVAILABLE;

1568

goto end;

1569

}

1570

1571

if(quit_now){

1572

goto end;

1573

}

1574

1575

/* Re-raise priviliges */

1576

errno = 0;

1577

ret = seteuid(0);

1578

if(ret == -1){

1579

perror_plus("seteuid");

1580

}

1581

1582

#ifdef __linux__

1583

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1584

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

1585

ret = klogctl(8, NULL, 5);

1586

bool restore_loglevel = true;

1587

if(ret == -1){

1588

restore_loglevel = false;

1589

perror_plus("klogctl");

1590

}

1591

#endif /* __linux__ */

1592

1593

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1594

if(sd < 0){

1595

perror_plus("socket");

1596

exitcode = EX_OSERR;

1597

#ifdef __linux__

1598

if(restore_loglevel){

1599

ret = klogctl(7, NULL, 0);

1600

if(ret == -1){

1601

perror_plus("klogctl");

1602

}

1603

}

1604

#endif /* __linux__ */

1605

/* Lower privileges */

1606

errno = 0;

1607

ret = seteuid(uid);

1608

if(ret == -1){

1609

perror_plus("seteuid");

1610

}

1611

goto end;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

perror_plus("ioctl SIOCGIFFLAGS");

1617

#ifdef __linux__

1618

if(restore_loglevel){

1619

ret = klogctl(7, NULL, 0);

1620

if(ret == -1){

1621

perror_plus("klogctl");

1622

}

1623

}

1624

#endif /* __linux__ */

1625

exitcode = EX_OSERR;

1626

/* Lower privileges */

1627

errno = 0;

1628

ret = seteuid(uid);

1629

if(ret == -1){

1630

perror_plus("seteuid");

1631

}

1632

goto end;

1633

}

1634

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

1635

network.ifr_flags |= IFF_UP;

1636

take_down_interface = true;

1637

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

1638

if(ret == -1){

1639

take_down_interface = false;

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1641

exitcode = EX_OSERR;

1642

#ifdef __linux__

1643

if(restore_loglevel){

1644

ret = klogctl(7, NULL, 0);

1645

if(ret == -1){

1646

perror_plus("klogctl");

1647

}

1648

}

1649

#endif /* __linux__ */

1650

/* Lower privileges */

1651

errno = 0;

1652

ret = seteuid(uid);

1653

if(ret == -1){

1654

perror_plus("seteuid");

1655

}

1656

goto end;

1657

}

1658

}

1659

/* Sleep checking until interface is running.

1660

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

1661

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

1662

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

1663

if(ret == -1){

1664

perror_plus("ioctl SIOCGIFFLAGS");

1665

} else if(network.ifr_flags & IFF_RUNNING){

1666

break;

1667

}

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

ret = nanosleep(&sleeptime, NULL);

1670

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

1671

perror_plus("nanosleep");

1672

}

1673

}

1674

if(not take_down_interface){

1675

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

1676

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

1677

if(ret == -1){

1678

perror_plus("close");

1679

}

1680

}

1681

#ifdef __linux__

1682

if(restore_loglevel){

1683

/* Restores kernel loglevel to default */

1684

ret = klogctl(7, NULL, 0);

1685

if(ret == -1){

1686

perror_plus("klogctl");

1687

}

1688

}

1689

#endif /* __linux__ */

1690

/* Lower privileges */

1691

errno = 0;

1692

if(take_down_interface){

1693

/* Lower privileges */

1694

ret = seteuid(uid);

1695

if(ret == -1){

1696

perror_plus("seteuid");

1697

}

2255

1698

} else {

2256

free(direntries);

2257

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

2258

exitcode = EXIT_FAILURE;

2259

goto end;

2260

}

2261

}

2262

2263

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

2264

{

2265

char *interface = NULL;

2266

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

2267

interface))){

2268

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

2269

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

2270

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

2271

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

2272

interface);

2273

interface = NULL;

2274

while((interface = argz_next(mc.interfaces,

2275

mc.interfaces_size, interface))){

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

}

2281

}

2282

break;

2283

}

2284

bool interface_was_up = interface_is_up(interface);

2285

errno = bring_up_interface(interface, delay);

2286

if(not interface_was_up){

2287

if(errno != 0){

2288

perror_plus("Failed to bring up interface");

2289

} else {

2290

errno = argz_add(&interfaces_to_take_down,

2291

&interfaces_to_take_down_size,

2292

interface);

2293

if(errno != 0){

2294

perror_plus("argz_add");

2295

}

2296

}

2297

}

2298

}

2299

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

2300

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

2301

}

2302

}

2303

2304

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

2305

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

2306

if(debug){

2307

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

2308

mc.interfaces);

2309

}

2310

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

1699

/* Lower privileges permanently */

1700

ret = setuid(uid);

1701

if(ret == -1){

1702

perror_plus("setuid");

1703

}

1704

}

2311

1705

}

2312

1706

2313

1707

if(quit_now){

2314

1708

goto end;

2315

1709

}

2316

1710

2317

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

1711

ret = init_gnutls_global(pubkey, seckey);

2318

1712

if(ret == -1){

2319

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

1713

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

2320

1714

exitcode = EX_UNAVAILABLE;

2321

1715

goto end;

2322

1716

} else {

2337

1731

goto end;

2338

1732

}

2339

1733

2340

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

2341

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

1734

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

1735

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

2342

1736

exitcode = EX_UNAVAILABLE;

2343

1737

goto end;

2344

1738

} else {

2353

1747

/* Connect directly, do not use Zeroconf */

2354

1748

/* (Mainly meant for debugging) */

2355

1749

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

2356

2357

1750

if(address == NULL){

2358

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

1751

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

2359

1752

exitcode = EX_USAGE;

2360

1753

goto end;

2361

1754

}

2364

1757

goto end;

2365

1758

}

2366

1759

2367

in_port_t port;

1760

uint16_t port;

2368

1761

errno = 0;

2369

1762

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

2370

1763

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

2371

or tmpmax != (in_port_t)tmpmax){

2372

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

1764

or tmpmax != (uint16_t)tmpmax){

1765

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

2373

1766

exitcode = EX_USAGE;

2374

1767

goto end;

2375

1768

}

2376

1769

2377

1770

if(quit_now){

2378

1771

goto end;

2379

1772

}

2380

1773

2381

port = (in_port_t)tmpmax;

1774

port = (uint16_t)tmpmax;

2382

1775

*address = '\0';

1776

address = connect_to;

2383

1777

/* Colon in address indicates IPv6 */

2384

1778

int af;

2385

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

1779

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

2386

1780

af = AF_INET6;

2387

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

2388

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

2389

{

2390

connect_to++;

2391

address[-1] = '\0';

2392

}

2393

1781

} else {

2394

1782

af = AF_INET;

2395

1783

}

2396

address = connect_to;

2397

1784

2398

1785

if(quit_now){

2399

1786

goto end;

2400

1787

}

2401

1788

2402

1789

while(not quit_now){

2403

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

2404

&mc);

1790

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

2405

1791

if(quit_now or ret == 0){

2406

1792

break;

2407

1793

}

2408

if(debug){

2409

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

2410

(int)retry_interval);

2411

}

2412

sleep((unsigned int)retry_interval);

2413

}

2414

2415

if(not quit_now){

1794

sleep((int)retry_interval or 1);

1795

};

1796

1797

if (not quit_now){

2416

1798

exitcode = EXIT_SUCCESS;

2417

1799

}

2418

1800

2419

1801

goto end;

2420

1802

}

2421

1803

2433

1815

config.publish_domain = 0;

2434

1816

2435

1817

/* Allocate a new server */

2436

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2437

&config, NULL, NULL, &ret_errno);

1818

mc.server = avahi_server_new(avahi_simple_poll_get

1819

(mc.simple_poll), &config, NULL,

1820

NULL, &error);

2438

1821

2439

1822

/* Free the Avahi configuration data */

2440

1823

avahi_server_config_free(&config);

2442

1825

2443

1826

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

2444

1827

if(mc.server == NULL){

2445

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

2446

avahi_strerror(ret_errno));

1828

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

1829

avahi_strerror(error));

2447

1830

exitcode = EX_UNAVAILABLE;

2448

1831

goto end;

2449

1832

}

2455

1838

/* Create the Avahi service browser */

2456

1839

sb = avahi_s_service_browser_new(mc.server, if_index,

2457

1840

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2458

NULL, 0, browse_callback,

2459

(void *)&mc);

1841

NULL, 0, browse_callback, NULL);

2460

1842

if(sb == NULL){

2461

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

2462

avahi_strerror(avahi_server_errno(mc.server)));

1843

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

1844

avahi_strerror(avahi_server_errno(mc.server)));

2463

1845

exitcode = EX_UNAVAILABLE;

2464

1846

goto end;

2465

1847

}

2471

1853

/* Run the main loop */

2472

1854

2473

1855

if(debug){

2474

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

1856

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

2475

1857

}

2476

1858

2477

ret = avahi_loop_with_timeout(simple_poll,

2478

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

1859

ret = avahi_loop_with_timeout(mc.simple_poll,

1860

(int)(retry_interval * 1000));

2479

1861

if(debug){

2480

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

2481

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

1862

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

1863

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

2482

1864

}

2483

1865

2484

1866

end:

2485

1867

2486

1868

if(debug){

2487

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

1869

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

2488

1870

}

2489

1871

2490

1872

/* Cleanup things */

2491

free(mc.interfaces);

2492

2493

1873

if(sb != NULL)

2494

1874

avahi_s_service_browser_free(sb);

2495

1875

2496

1876

if(mc.server != NULL)

2497

1877

avahi_server_free(mc.server);

2498

1878

2499

if(simple_poll != NULL)

2500

avahi_simple_poll_free(simple_poll);

1879

if(mc.simple_poll != NULL)

1880

avahi_simple_poll_free(mc.simple_poll);

2501

1881

2502

1882

if(gnutls_initialized){

2503

1883

gnutls_certificate_free_credentials(mc.cred);

2508

1888

if(gpgme_initialized){

2509

1889

gpgme_release(mc.ctx);

2510

1890

}

2511

1891

2512

1892

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

2513

1893

has seen */

2514

1894

if(mc.current_server != NULL){

2520

1900

}

2521

1901

}

2522

1902

2523

/* Re-raise privileges */

2524

{

2525

ret_errno = raise_privileges();

2526

if(ret_errno != 0){

2527

perror_plus("Failed to raise privileges");

2528

} else {

2529

2530

/* Run network hooks */

2531

run_network_hooks("stop", interfaces_hooks != NULL ?

2532

interfaces_hooks : "", delay);

2533

2534

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

2535

{

2536

char *interface = NULL;

2537

while((interface=argz_next(interfaces_to_take_down,

2538

interfaces_to_take_down_size,

2539

interface))){

2540

ret_errno = take_down_interface(interface);

2541

if(ret_errno != 0){

2542

errno = ret_errno;

2543

perror_plus("Failed to take down interface");

2544

}

2545

}

2546

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

2547

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

2548

" down\n");

2549

}

2550

}

1903

/* Take down the network interface */

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

1906

errno = 0;

1907

ret = seteuid(0);

1908

if(ret == -1){

1909

perror_plus("seteuid");

2551

1910

}

2552

ret_errno = lower_privileges_permanently();

2553

if(ret_errno != 0){

2554

perror_plus("Failed to lower privileges permanently");

1911

if(geteuid() == 0){

1912

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

1913

if(ret == -1){

1914

perror_plus("ioctl SIOCGIFFLAGS");

1915

} else if(network.ifr_flags & IFF_UP) {

1916

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

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1920

}

1921

}

1922

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

1923

if(ret == -1){

1924

perror_plus("close");

1925

}

1926

/* Lower privileges permanently */

1927

errno = 0;

1928

ret = setuid(uid);

1929

if(ret == -1){

1930

perror_plus("setuid");

1931

}

2555

1932

}

2556

1933

}

2557

1934

2558

free(interfaces_to_take_down);

2559

free(interfaces_hooks);

2560

2561

1935

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

2562

1936

if(tempdir_created){

2563

1937

struct dirent **direntries = NULL;

2564

1938

struct dirent *direntry = NULL;

2565

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

2566

alphasort);

2567

if(numentries > 0){

2568

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

1939

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

1940

if (ret > 0){

1941

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

2569

1942

direntry = direntries[i];

2570

1943

char *fullname = NULL;

2571

1944

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

2576

1949

}

2577

1950

ret = remove(fullname);

2578

1951

if(ret == -1){

2579

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

2580

strerror(errno));

1952

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

1953

strerror(errno));

2581

1954

}

2582

1955

free(fullname);

2583

1956

}

2584

1957

}

2585

1958

2586

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

1959

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

1960

specify */

2587

1961

free(direntries);

2588

if(numentries == -1){

1962

if (ret == -1){

2589

1963

perror_plus("scandir");

2590

1964

}

2591

1965

ret = rmdir(tempdir);