/mandos/release : revision 237.7.215

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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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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#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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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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SIOCSIFFLAGS, if_indextoname(),

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*/

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

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

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setgid(), pause() */

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

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

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

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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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132

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

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133

#define SECKEY "seckey.txt"

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134

#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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138

static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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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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gnutls_dh_params_t dh_params;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP" };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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173

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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 */

178

void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

194

}

195

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/*

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

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198

* 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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200

*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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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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return 0;

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211

}

212

*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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214

}

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return buffer_capacity;

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}

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

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

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int af, server **current_server){

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int 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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}

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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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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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/* Special case of first server */

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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

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} else {

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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

248

if(ret == -1){

249

perror_plus("clock_gettime");

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return false;

251

}

252

return true;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

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272

if(fd == -1){

188

perror("open");

273

perror_plus("open");

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return false;

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}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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if(ret == -1){

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perror("close");

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perror_plus("close");

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}

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gpgme_data_release(pgp_data);

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return true;

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

312

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

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313

rc = gpgme_get_engine_info(&engine_info);

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314

if(rc != GPG_ERR_NO_ERROR){

230

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

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gpgme_strsource(rc), gpgme_strerror(rc));

315

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

233

318

}

234

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while(engine_info != NULL){

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325

engine_info = engine_info->next;

241

326

}

242

327

if(engine_info == NULL){

243

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

328

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

329

tempdir);

244

330

return false;

245

331

}

246

332

247

333

/* Create new GPGME "context" */

248

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

334

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

249

335

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

336

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

337

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

338

gpgme_strerror(rc));

252

339

return false;

253

340

}

254

341

265

352

*/

266

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

267

354

size_t crypto_size,

268

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

269

357

gpgme_data_t dh_crypto, dh_plain;

270

358

gpgme_error_t rc;

271

359

ssize_t ret;

273

361

ssize_t plaintext_length = 0;

274

362

275

363

if(debug){

276

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

364

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

277

365

}

278

366

279

367

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

280

368

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

369

0);

282

370

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

285

373

return -1;

286

374

}

287

375

288

376

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

289

377

rc = gpgme_data_new(&dh_plain);

290

378

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

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

381

gpgme_strsource(rc), gpgme_strerror(rc));

293

382

gpgme_data_release(dh_crypto);

294

383

return -1;

295

384

}

296

385

297

386

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

298

387

data buffer */

299

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

388

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

300

389

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

390

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

391

gpgme_strsource(rc), gpgme_strerror(rc));

303

392

plaintext_length = -1;

304

393

if(debug){

305

394

gpgme_decrypt_result_t result;

306

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

307

396

if(result == NULL){

308

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

397

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

309

398

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

399

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

400

result->unsupported_algorithm);

401

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

402

result->wrong_key_usage);

314

403

if(result->file_name != NULL){

315

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

404

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

316

405

}

317

406

gpgme_recipient_t recipient;

318

407

recipient = result->recipients;

319

408

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

409

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

410

gpgme_pubkey_algo_name

411

(recipient->pubkey_algo));

412

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

413

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

414

recipient->status == GPG_ERR_NO_SECKEY

415

? "No" : "Yes");

326

416

recipient = recipient->next;

327

417

}

328

418

}

331

421

}

332

422

333

423

if(debug){

334

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

424

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

335

425

}

336

426

337

427

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

338

428

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

339

perror("gpgme_data_seek");

429

perror_plus("gpgme_data_seek");

340

430

plaintext_length = -1;

341

431

goto decrypt_end;

342

432

}

344

434

*plaintext = NULL;

345

435

while(true){

346

436

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

437

(size_t)plaintext_length,

438

plaintext_capacity);

349

439

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

440

perror_plus("incbuffer");

441

plaintext_length = -1;

442

goto decrypt_end;

353

443

}

354

444

355

445

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

450

break;

361

451

}

362

452

if(ret < 0){

363

perror("gpgme_data_read");

453

perror_plus("gpgme_data_read");

364

454

plaintext_length = -1;

365

455

goto decrypt_end;

366

456

}

368

458

}

369

459

370

460

if(debug){

371

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

461

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

372

462

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

373

463

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

374

464

}

386

476

}

387

477

388

478

static const char * safer_gnutls_strerror(int value){

389

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

390

-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

391

480

if(ret == NULL)

392

481

ret = "(unknown)";

393

482

return ret;

396

485

/* GnuTLS log function callback */

397

486

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

398

487

const char* string){

399

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

488

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

400

489

}

401

490

402

491

static int init_gnutls_global(const char *pubkeyfilename,

403

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

404

494

int ret;

405

495

406

496

if(debug){

407

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

497

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

408

498

}

409

499

410

500

ret = gnutls_global_init();

411

501

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

502

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

503

safer_gnutls_strerror(ret));

414

504

return -1;

415

505

}

416

506

423

513

}

424

514

425

515

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

427

517

if(ret != GNUTLS_E_SUCCESS){

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

518

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

519

safer_gnutls_strerror(ret));

433

520

gnutls_global_deinit();

434

521

return -1;

435

522

}

436

523

437

524

if(debug){

438

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

439

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

440

seckeyfilename);

525

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

526

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

527

pubkeyfilename,

528

seckeyfilename);

441

529

}

442

530

443

531

ret = gnutls_certificate_set_openpgp_key_file

444

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

445

533

GNUTLS_OPENPGP_FMT_BASE64);

446

534

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

535

fprintf_plus(stderr,

536

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

537

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

538

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

539

safer_gnutls_strerror(ret));

452

540

goto globalfail;

453

541

}

454

542

455

543

/* GnuTLS server initialization */

456

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

457

545

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

" initialization: %s\n",

548

safer_gnutls_strerror(ret));

460

549

goto globalfail;

461

550

}

462

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

551

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

463

552

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

553

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

554

safer_gnutls_strerror(ret));

466

555

goto globalfail;

467

556

}

468

557

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

470

559

471

560

return 0;

472

561

473

562

globalfail:

474

563

475

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

476

565

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

478

567

return -1;

479

568

}

480

569

481

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

482

572

int ret;

483

573

/* GnuTLS session creation */

484

574

do {

488

578

}

489

579

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

490

580

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

581

fprintf_plus(stderr,

582

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

583

safer_gnutls_strerror(ret));

493

584

}

494

585

495

586

{

496

587

const char *err;

497

588

do {

498

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

589

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

499

590

if(quit_now){

500

591

gnutls_deinit(*session);

501

592

return -1;

502

593

}

503

594

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

504

595

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

596

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

597

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

598

safer_gnutls_strerror(ret));

508

599

gnutls_deinit(*session);

509

600

return -1;

510

601

}

512

603

513

604

do {

514

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

606

mc->cred);

516

607

if(quit_now){

517

608

gnutls_deinit(*session);

518

609

return -1;

519

610

}

520

611

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

521

612

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

613

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

614

safer_gnutls_strerror(ret));

524

615

gnutls_deinit(*session);

525

616

return -1;

526

617

}

528

619

/* ignore client certificate if any. */

529

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

530

621

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

532

623

533

624

return 0;

534

625

}

538

629

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

539

630

540

631

/* Called when a Mandos server is found */

541

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

632

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

542

633

AvahiIfIndex if_index,

543

int af){

634

int af, mandos_context *mc){

544

635

int ret, tcp_sd = -1;

545

636

ssize_t sret;

546

637

union {

571

662

pf = PF_INET;

572

663

break;

573

664

default:

574

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

665

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

575

666

errno = EINVAL;

576

667

return -1;

577

668

}

578

669

579

ret = init_gnutls_session(&session);

670

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

671

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

672

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

673

bool match = false;

674

{

675

char *interface = NULL;

676

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

677

interface))){

678

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

679

match = true;

680

break;

681

}

682

}

683

}

684

if(not match){

685

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

686

connect to the server */

687

if(debug){

688

char interface[IF_NAMESIZE];

689

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

690

perror_plus("if_indextoname");

691

} else {

692

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

693

" \"%s\"\n",

694

if_indextoname((unsigned int)if_index,

695

interface));

696

}

697

}

698

return -1;

699

}

700

}

701

702

ret = init_gnutls_session(&session, mc);

580

703

if(ret != 0){

581

704

return -1;

582

705

}

583

706

584

707

if(debug){

585

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

586

"\n", ip, port);

708

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

709

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

587

710

}

588

711

589

712

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

713

if(tcp_sd < 0){

591

714

int e = errno;

592

perror("socket");

715

perror_plus("socket");

593

716

errno = e;

594

717

goto mandos_end;

595

718

}

609

732

}

610

733

if(ret < 0 ){

611

734

int e = errno;

612

perror("inet_pton");

735

perror_plus("inet_pton");

613

736

errno = e;

614

737

goto mandos_end;

615

738

}

616

739

if(ret == 0){

617

740

int e = errno;

618

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

741

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

619

742

errno = e;

620

743

goto mandos_end;

621

744

}

622

745

if(af == AF_INET6){

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

627

751

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

630

756

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

757

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

758

" incomplete without a network interface\n");

633

759

errno = EINVAL;

634

760

goto mandos_end;

635

761

}

637

763

to.in6.sin6_scope_id = (uint32_t)if_index;

638

764

}

639

765

} else {

640

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

641

-Wconversion and

642

-Wunreachable-code */

766

to.in.sin_port = htons(port);

643

767

}

644

768

645

769

if(quit_now){

651

775

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

776

char interface[IF_NAMESIZE];

653

777

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

654

perror("if_indextoname");

778

perror_plus("if_indextoname");

655

779

} else {

656

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

657

ip, interface, port);

780

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

781

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

658

782

}

659

783

} else {

660

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

661

port);

784

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

785

ip, (uintmax_t)port);

662

786

}

663

787

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

788

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

665

const char *pcret;

666

789

if(af == AF_INET6){

667

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

668

sizeof(addrstr));

790

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

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

669

793

} else {

670

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

671

sizeof(addrstr));

794

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

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

672

797

}

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

798

if(ret == EAI_SYSTEM){

799

perror_plus("getnameinfo");

800

} else if(ret != 0) {

801

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

802

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

803

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

679

804

}

680

805

}

681

806

692

817

if(ret < 0){

693

818

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

694

819

int e = errno;

695

perror("connect");

820

perror_plus("connect");

696

821

errno = e;

697

822

}

698

823

goto mandos_end;

708

833

while(true){

709

834

size_t out_size = strlen(out);

710

835

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

711

out_size - written));

836

out_size - written));

712

837

if(ret == -1){

713

838

int e = errno;

714

perror("write");

839

perror_plus("write");

715

840

errno = e;

716

841

goto mandos_end;

717

842

}

734

859

}

735

860

736

861

if(debug){

737

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

862

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

738

863

}

739

864

740

865

if(quit_now){

742

867

goto mandos_end;

743

868

}

744

869

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

870

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

871

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

872

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

873

gnutls_transport_set_ptr(session,

874

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

746

875

747

876

if(quit_now){

748

877

errno = EINTR;

759

888

760

889

if(ret != GNUTLS_E_SUCCESS){

761

890

if(debug){

762

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

891

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

763

892

gnutls_perror(ret);

764

893

}

765

894

errno = EPROTO;

769

898

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

770

899

771

900

if(debug){

772

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

773

ip);

901

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

902

" %s\n", ip);

774

903

}

775

904

776

905

while(true){

781

910

}

782

911

783

912

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

913

buffer_capacity);

785

914

if(buffer_capacity == 0){

786

915

int e = errno;

787

perror("incbuffer");

916

perror_plus("incbuffer");

788

917

errno = e;

789

918

goto mandos_end;

790

919

}

814

943

}

815

944

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

816

945

if(ret < 0){

817

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

946

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

947

"***\n");

818

948

gnutls_perror(ret);

819

949

errno = EPROTO;

820

950

goto mandos_end;

821

951

}

822

952

break;

823

953

default:

824

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

825

" encrypted session with Mandos server\n");

954

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

955

" encrypted session with Mandos server\n");

826

956

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

957

errno = EIO;

828

958

goto mandos_end;

833

963

}

834

964

835

965

if(debug){

836

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

966

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

837

967

}

838

968

839

969

if(quit_now){

851

981

852

982

if(buffer_length > 0){

853

983

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

856

&decrypted_buffer);

984

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

985

&decrypted_buffer, mc);

857

986

if(decrypted_buffer_size >= 0){

858

987

859

988

written = 0;

869

998

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

870

999

int e = errno;

871

1000

if(debug){

872

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

873

strerror(errno));

1001

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

1002

strerror(errno));

874

1003

}

875

1004

errno = e;

876

1005

goto mandos_end;

895

1024

if(e == 0){

896

1025

e = errno;

897

1026

}

898

perror("close");

1027

perror_plus("close");

899

1028

}

900

1029

gnutls_deinit(session);

1030

errno = e;

901

1031

if(quit_now){

902

e = EINTR;

1032

errno = EINTR;

903

1033

retval = -1;

904

1034

}

905

errno = e;

906

1035

}

907

1036

return retval;

908

1037

}

920

1049

AVAHI_GCC_UNUSED AvahiStringList *txt,

921

1050

AVAHI_GCC_UNUSED AvahiLookupResultFlags

922

1051

flags,

923

AVAHI_GCC_UNUSED void* userdata){

924

assert(r);

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

925

1056

926

1057

/* Called whenever a service has been resolved successfully or

927

1058

timed out */

933

1064

switch(event){

934

1065

default:

935

1066

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1067

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

1068

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

1069

domain,

1070

avahi_strerror(avahi_server_errno

1071

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

939

1072

break;

940

1073

941

1074

case AVAHI_RESOLVER_FOUND:

943

1076

char ip[AVAHI_ADDRESS_STR_MAX];

944

1077

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

945

1078

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1079

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

1080

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

1081

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

949

1082

}

950

int ret = start_mandos_communication(ip, port, interface,

951

avahi_proto_to_af(proto));

1083

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

1084

interface,

1085

avahi_proto_to_af(proto),

1086

mc);

952

1087

if(ret == 0){

953

avahi_simple_poll_quit(mc.simple_poll);

1088

avahi_simple_poll_quit(simple_poll);

1089

} else {

1090

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

1091

avahi_proto_to_af(proto),

1092

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

1093

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

1094

" list\n", name);

1095

}

954

1096

}

955

1097

}

956

1098

}

966

1108

const char *domain,

967

1109

AVAHI_GCC_UNUSED AvahiLookupResultFlags

968

1110

flags,

969

AVAHI_GCC_UNUSED void* userdata){

970

assert(b);

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

971

1115

972

1116

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

973

1117

is removed from the LAN */

980

1124

default:

981

1125

case AVAHI_BROWSER_FAILURE:

982

1126

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

1127

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

1128

avahi_strerror(avahi_server_errno

1129

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

1130

avahi_simple_poll_quit(simple_poll);

986

1131

return;

987

1132

988

1133

case AVAHI_BROWSER_NEW:

991

1136

the callback function is called the Avahi server will free the

992

1137

resolver for us. */

993

1138

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

997

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

998

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

1139

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

1140

interface, protocol, name, type,

1141

domain, protocol, 0,

1142

resolve_callback, mc) == NULL)

1143

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

1144

" %s\n", name,

1145

avahi_strerror(avahi_server_errno

1146

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

999

1147

break;

1000

1148

1001

1149

case AVAHI_BROWSER_REMOVE:

1004

1152

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1153

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1154

if(debug){

1007

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

1155

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

1156

" searching...\n");

1008

1157

}

1009

1158

break;

1010

1159

}

1011

1160

}

1012

1161

1013

/* stop main loop after sigterm has been called */

1162

/* Signal handler that stops main loop after SIGTERM */

1014

1163

static void handle_sigterm(int sig){

1015

1164

if(quit_now){

1016

1165

return;

1018

1167

quit_now = 1;

1019

1168

signal_received = sig;

1020

1169

int old_errno = errno;

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1170

/* set main loop to exit */

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1023

1173

}

1024

1174

errno = old_errno;

1025

1175

}

1026

1176

1177

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

1178

int ret;

1179

error_t ret_errno;

1180

1181

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

1182

if(s < 0){

1183

ret_errno = errno;

1184

perror_plus("socket");

1185

errno = ret_errno;

1186

return false;

1187

}

1188

strcpy(ifr->ifr_name, ifname);

1189

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1190

if(ret == -1){

1191

if(debug){

1192

ret_errno = errno;

1193

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1195

}

1196

return false;

1197

}

1198

return true;

1199

}

1200

1201

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

1202

1203

/* Reject the loopback device */

1204

if(ifr->ifr_flags & IFF_LOOPBACK){

1205

if(debug){

1206

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

1207

ifname);

1208

}

1209

return false;

1210

}

1211

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

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return true;

1218

}

1219

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

1220

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

1221

if(debug){

1222

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1223

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

1224

}

1225

return false;

1226

}

1227

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

1228

if(ifr->ifr_flags & IFF_NOARP){

1229

if(debug){

1230

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

1231

ifname);

1232

}

1233

return false;

1234

}

1235

1236

/* Accept this device */

1237

if(debug){

1238

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

1239

}

1240

return true;

1241

}

1242

1027

1243

/*

1028

1244

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

1029

1245

* corresponds to an acceptable network device.

1030

1246

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

1031

1247

*/

1032

1248

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

1249

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

1042

1250

return 0;

1043

1251

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1252

1253

struct ifreq ifr;

1254

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

1255

if(debug){

1256

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

1257

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

1258

}

1259

return 0;

1260

}

1261

1262

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

1263

return 0;

1264

}

1265

return 1;

1266

}

1267

1268

/*

1269

* This function determines if a network interface is up.

1270

*/

1271

bool interface_is_up(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1282

}

1283

1284

/*

1285

* This function determines if a network interface is running

1286

*/

1287

bool interface_is_running(const char *interface){

1288

struct ifreq ifr;

1289

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

1290

if(debug){

1291

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

1292

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

1293

}

1294

return false;

1295

}

1296

1297

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

1298

}

1299

1300

int notdotentries(const struct dirent *direntry){

1301

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

1302

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

1303

and (direntry->d_name[1] == '\0'

1304

or (direntry->d_name[1] == '.'

1305

and direntry->d_name[2] == '\0'))){

1306

return 0;

1307

}

1308

return 1;

1309

}

1310

1311

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

1312

int runnable_hook(const struct dirent *direntry){

1313

int ret;

1314

size_t sret;

1315

struct stat st;

1316

1317

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

1318

/* Empty name? */

1319

return 0;

1320

}

1321

1322

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

1323

"abcdefghijklmnopqrstuvwxyz"

1324

"0123456789"

1325

"_-");

1326

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

1327

/* Contains non-allowed characters */

1328

if(debug){

1329

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

1330

direntry->d_name);

1331

}

1332

return 0;

1333

}

1334

1335

char *fullname = NULL;

1336

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

1337

if(ret < 0){

1338

perror_plus("asprintf");

1339

return 0;

1340

}

1341

1342

ret = stat(fullname, &st);

1343

if(ret == -1){

1344

if(debug){

1345

perror_plus("Could not stat hook");

1346

}

1347

return 0;

1348

}

1349

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

1350

/* Not a regular file */

1351

if(debug){

1352

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

1353

direntry->d_name);

1354

}

1355

return 0;

1356

}

1357

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

1358

/* Not executable */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

return 0;

1364

}

1365

if(debug){

1366

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

1367

direntry->d_name);

1368

}

1369

return 1;

1370

}

1371

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

mandos_context *mc){

1374

int ret;

1375

struct timespec now;

1376

struct timespec waited_time;

1377

intmax_t block_time;

1378

1379

while(true){

1380

if(mc->current_server == NULL){

1381

if (debug){

1382

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

1383

" No timeout!\n");

1384

}

1385

ret = avahi_simple_poll_iterate(s, -1);

1386

} else {

1387

if (debug){

1388

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

1389

" it, or wait\n");

1390

}

1391

/* the current time */

1392

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1393

if(ret == -1){

1394

perror_plus("clock_gettime");

1395

return -1;

1396

}

1397

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

1398

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

1399

waited_time.tv_sec = (now.tv_sec

1400

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

1401

waited_time.tv_nsec = (now.tv_nsec

1402

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

1403

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

1404

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

1405

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

1406

block_time = ((retry_interval

1407

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

1408

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

1409

1410

if (debug){

1411

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

1412

block_time);

1413

}

1414

1415

if(block_time <= 0){

1416

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

1417

mc->current_server->port,

1418

mc->current_server->if_index,

1419

mc->current_server->af, mc);

1420

if(ret == 0){

1421

avahi_simple_poll_quit(s);

1422

return 0;

1423

}

1424

ret = clock_gettime(CLOCK_MONOTONIC,

1425

&mc->current_server->last_seen);

1426

if(ret == -1){

1427

perror_plus("clock_gettime");

1428

return -1;

1429

}

1430

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

1431

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

1432

servers, but don't block */

1433

}

1434

1435

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

1436

}

1437

if(ret != 0){

1438

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

1439

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

1440

}

1441

}

1442

}

1443

}

1444

1445

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

1446

error_t raise_privileges(void){

1447

error_t old_errno = errno;

1448

error_t ret_errno = 0;

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t raise_privileges_permanently(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = raise_privileges();

1461

if(ret_errno != 0){

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

error_t lower_privileges(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = 0;

1477

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

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

/* Lower privileges permanently */

1486

error_t lower_privileges_permanently(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("setuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

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

1498

const float delay){

1499

struct dirent **direntries;

1500

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

1501

alphasort);

1502

if(numhooks == -1){

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1510

}

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

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

1515

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

1516

direntry = direntries[i];

1517

char *fullname = NULL;

1518

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

1519

if(ret < 0){

1520

perror_plus("asprintf");

1521

continue;

1522

}

1523

if(debug){

1524

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

1525

direntry->d_name);

1526

}

1527

pid_t hook_pid = fork();

1528

if(hook_pid == 0){

1529

/* Child */

1530

/* Raise privileges */

1531

raise_privileges_permanently();

1532

/* Set group */

1533

errno = 0;

1534

ret = setgid(0);

1535

if(ret == -1){

1536

perror_plus("setgid");

1537

}

1538

/* Reset supplementary groups */

1539

errno = 0;

1540

ret = setgroups(0, NULL);

1541

if(ret == -1){

1542

perror_plus("setgroups");

1543

}

1544

dup2(devnull, STDIN_FILENO);

1545

close(devnull);

1546

dup2(STDERR_FILENO, STDOUT_FILENO);

1547

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

1548

if(ret == -1){

1549

perror_plus("setenv");

1550

_exit(EX_OSERR);

1551

}

1552

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

1553

if(ret == -1){

1554

perror_plus("setenv");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

perror_plus("setenv");

1560

_exit(EX_OSERR);

1561

}

1562

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

1563

if(ret == -1){

1564

perror_plus("setenv");

1565

_exit(EX_OSERR);

1566

}

1567

char *delaystring;

1568

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

1569

if(ret == -1){

1570

perror_plus("asprintf");

1571

_exit(EX_OSERR);

1572

}

1573

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

1574

if(ret == -1){

1575

free(delaystring);

1576

perror_plus("setenv");

1577

_exit(EX_OSERR);

1578

}

1579

free(delaystring);

1580

if(connect_to != NULL){

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

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

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1591

} else {

1592

int status;

1593

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

1594

perror_plus("waitpid");

1595

free(fullname);

1596

continue;

1597

}

1598

if(WIFEXITED(status)){

1599

if(WEXITSTATUS(status) != 0){

1600

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

1601

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

1602

WEXITSTATUS(status));

1603

free(fullname);

1604

continue;

1605

}

1606

} else if(WIFSIGNALED(status)){

1607

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

1608

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

1609

WTERMSIG(status));

1610

free(fullname);

1611

continue;

1612

} else {

1613

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

1614

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

1615

free(fullname);

1616

continue;

1617

}

1618

}

1619

free(fullname);

1620

if(debug){

1621

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

1622

direntry->d_name);

1623

}

1624

}

1625

close(devnull);

1626

}

1627

return true;

1628

}

1629

1630

error_t bring_up_interface(const char *const interface,

1631

const float delay){

1632

int sd = -1;

1633

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1636

struct ifreq network;

1637

unsigned int if_index = if_nametoindex(interface);

1638

if(if_index == 0){

1639

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

1640

errno = old_errno;

1641

return ENXIO;

1642

}

1643

1644

if(quit_now){

1645

errno = old_errno;

1646

return EINTR;

1647

}

1648

1649

if(not interface_is_up(interface)){

1650

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

1651

ret_errno = errno;

1652

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

1653

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

1654

return ret_errno;

1655

}

1656

network.ifr_flags |= IFF_UP;

1657

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1660

ret_errno = errno;

1661

perror_plus("socket");

1662

errno = old_errno;

1663

return ret_errno;

1664

}

1665

1666

if(quit_now){

1667

close(sd);

1668

errno = old_errno;

1669

return EINTR;

1670

}

1671

1672

if(debug){

1673

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

1674

interface);

1675

}

1676

1677

/* Raise priviliges */

1678

raise_privileges();

1679

1680

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

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

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1688

}

1689

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1692

#ifdef __linux__

1693

if(restore_loglevel){

1694

ret_linux = klogctl(7, NULL, 0);

1695

if(ret_linux == -1){

1696

perror_plus("klogctl");

1697

}

1698

}

1699

#endif /* __linux__ */

1700

1701

/* Lower privileges */

1702

lower_privileges();

1703

1704

/* Close the socket */

1705

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

1706

if(ret == -1){

1707

perror_plus("close");

1708

}

1709

1710

if(ret_setflags == -1){

1711

errno = ret_errno;

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1713

errno = old_errno;

1714

return ret_errno;

1715

}

1716

} else if(debug){

1717

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

1718

interface);

1719

}

1720

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

if(interface_is_running(interface)){

1070

1725

break;

1071

1726

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1727

struct timespec sleeptime = { .tv_nsec = 250000000 };

1728

ret = nanosleep(&sleeptime, NULL);

1729

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

1730

perror_plus("nanosleep");

1731

}

1732

}

1733

1734

errno = old_errno;

1735

return 0;

1736

}

1737

1738

error_t take_down_interface(const char *const interface){

1739

error_t old_errno = errno;

1740

struct ifreq network;

1741

unsigned int if_index = if_nametoindex(interface);

1742

if(if_index == 0){

1743

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

1744

errno = old_errno;

1745

return ENXIO;

1746

}

1747

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1749

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

1750

ret_errno = errno;

1751

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

1752

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

1753

return ret_errno;

1754

}

1755

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

1756

1757

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

1758

if(sd < 0){

1759

ret_errno = errno;

1760

perror_plus("socket");

1761

errno = old_errno;

1762

return ret_errno;

1763

}

1764

1765

if(debug){

1766

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

1767

interface);

1768

}

1769

1770

/* Raise priviliges */

1771

raise_privileges();

1772

1773

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

1774

ret_errno = errno;

1775

1776

/* Lower privileges */

1777

lower_privileges();

1778

1779

/* Close the socket */

1780

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

1781

if(ret == -1){

1782

perror_plus("close");

1783

}

1784

1785

if(ret_setflags == -1){

1786

errno = ret_errno;

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

errno = old_errno;

1789

return ret_errno;

1790

}

1791

} else if(debug){

1792

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

1793

interface);

1794

}

1795

1796

errno = old_errno;

1797

return 0;

1120

1798

}

1121

1799

1122

1800

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

1801

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

1802

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

1803

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

1804

.interfaces = NULL, .interfaces_size = 0 };

1123

1805

AvahiSServiceBrowser *sb = NULL;

1124

int error;

1806

error_t ret_errno;

1125

1807

int ret;

1126

1808

intmax_t tmpmax;

1127

1809

char *tmp;

1128

1810

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

1130

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

1133

uid_t uid;

1134

gid_t gid;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1135

1813

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

1136

1814

bool tempdir_created = false;

1137

1815

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1138

1816

const char *seckey = PATHDIR "/" SECKEY;

1139

1817

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1140

1819

1141

1820

bool gnutls_initialized = false;

1142

1821

bool gpgme_initialized = false;

1143

1822

float delay = 2.5f;

1823

double retry_interval = 10; /* 10s between trying a server and

1824

retrying the same server again */

1144

1825

1145

1826

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1827

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1833

errno = 0;

1153

1834

ret = setgid(gid);

1154

1835

if(ret == -1){

1155

perror("setgid");

1836

perror_plus("setgid");

1156

1837

}

1157

1838

1158

1839

/* Lower user privileges (temporarily) */

1159

1840

errno = 0;

1160

1841

ret = seteuid(uid);

1161

1842

if(ret == -1){

1162

perror("seteuid");

1843

perror_plus("seteuid");

1163

1844

}

1164

1845

1165

1846

if(quit_now){

1200

1881

.arg = "SECONDS",

1201

1882

.doc = "Maximum delay to wait for interface startup",

1202

1883

.group = 2 },

1884

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

1885

.arg = "SECONDS",

1886

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

1887

.group = 2 },

1888

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

1889

.arg = "DIR",

1890

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

1891

.group = 2 },

1203

1892

/*

1204

1893

* These reproduce what we would get without ARGP_NO_HELP

1205

1894

*/

1223

1912

connect_to = arg;

1224

1913

break;

1225

1914

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

1226

interface = arg;

1915

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

1916

arg, (int)',');

1917

if(ret_errno != 0){

1918

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

1919

}

1227

1920

break;

1228

1921

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

1229

1922

seckey = arg;

1249

1942

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

1250

1943

argp_error(state, "Bad delay");

1251

1944

}

1945

case 132: /* --retry */

1946

errno = 0;

1947

retry_interval = strtod(arg, &tmp);

1948

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

1949

or (retry_interval * 1000) > INT_MAX

1950

or retry_interval < 0){

1951

argp_error(state, "Bad retry interval");

1952

}

1953

break;

1954

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

1955

hookdir = arg;

1252

1956

break;

1253

1957

/*

1254

1958

* These reproduce what we would get without ARGP_NO_HELP

1261

1965

argp_state_help(state, state->out_stream,

1262

1966

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1967

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

1264

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

1968

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

1265

1969

exit(argp_err_exit_status);

1266

1970

break;

1267

1971

default:

1282

1986

case ENOMEM:

1283

1987

default:

1284

1988

errno = ret;

1285

perror("argp_parse");

1989

perror_plus("argp_parse");

1286

1990

exitcode = EX_OSERR;

1287

1991

goto end;

1288

1992

case EINVAL:

1290

1994

goto end;

1291

1995

}

1292

1996

}

1997

1998

{

1999

/* Work around Debian bug #633582:

2000

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

2001

2002

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2004

struct stat st;

2005

2006

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

2007

int seckey_fd = open(seckey, O_RDONLY);

2008

if(seckey_fd == -1){

2009

perror_plus("open");

2010

} else {

2011

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

2012

if(ret == -1){

2013

perror_plus("fstat");

2014

} else {

2015

if(S_ISREG(st.st_mode)

2016

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

2017

ret = fchown(seckey_fd, uid, gid);

2018

if(ret == -1){

2019

perror_plus("fchown");

2020

}

2021

}

2022

}

2023

TEMP_FAILURE_RETRY(close(seckey_fd));

2024

}

2025

}

2026

2027

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

2028

int pubkey_fd = open(pubkey, O_RDONLY);

2029

if(pubkey_fd == -1){

2030

perror_plus("open");

2031

} else {

2032

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

2033

if(ret == -1){

2034

perror_plus("fstat");

2035

} else {

2036

if(S_ISREG(st.st_mode)

2037

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

2038

ret = fchown(pubkey_fd, uid, gid);

2039

if(ret == -1){

2040

perror_plus("fchown");

2041

}

2042

}

2043

}

2044

TEMP_FAILURE_RETRY(close(pubkey_fd));

2045

}

2046

}

2047

2048

/* Lower privileges */

2049

lower_privileges();

2050

}

2051

}

2052

2053

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

2054

{

2055

char *interface = NULL;

2056

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

2057

interface))){

2058

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

2059

and if_nametoindex(interface) == 0){

2060

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

2061

fprintf_plus(stderr, "Not using nonexisting interface"

2062

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

2063

}

2064

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

2065

interface = NULL;

2066

}

2067

}

2068

}

2069

2070

/* Run network hooks */

2071

{

2072

if(mc.interfaces != NULL){

2073

interfaces_hooks = malloc(mc.interfaces_size);

2074

if(interfaces_hooks == NULL){

2075

perror_plus("malloc");

2076

goto end;

2077

}

2078

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

2079

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

2080

}

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

2085

}

1293

2086

1294

2087

if(not debug){

1295

2088

avahi_set_log_function(empty_log);

1296

2089

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

2090

1323

2091

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

1324

2092

from the signal handler */

1325

2093

/* Initialize the pseudo-RNG for Avahi */

1326

2094

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

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

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

2097

fprintf_plus(stderr,

2098

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

1330

2099

exitcode = EX_UNAVAILABLE;

1331

2100

goto end;

1332

2101

}

1334

2103

sigemptyset(&sigterm_action.sa_mask);

1335

2104

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1336

2105

if(ret == -1){

1337

perror("sigaddset");

2106

perror_plus("sigaddset");

1338

2107

exitcode = EX_OSERR;

1339

2108

goto end;

1340

2109

}

1341

2110

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1342

2111

if(ret == -1){

1343

perror("sigaddset");

2112

perror_plus("sigaddset");

1344

2113

exitcode = EX_OSERR;

1345

2114

goto end;

1346

2115

}

1347

2116

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1348

2117

if(ret == -1){

1349

perror("sigaddset");

2118

perror_plus("sigaddset");

1350

2119

exitcode = EX_OSERR;

1351

2120

goto end;

1352

2121

}

1356

2125

*/

1357

2126

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1358

2127

if(ret == -1){

1359

perror("sigaction");

2128

perror_plus("sigaction");

1360

2129

return EX_OSERR;

1361

2130

}

1362

2131

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

2132

ret = sigaction(SIGINT, &sigterm_action, NULL);

1364

2133

if(ret == -1){

1365

perror("sigaction");

2134

perror_plus("sigaction");

1366

2135

exitcode = EX_OSERR;

1367

2136

goto end;

1368

2137

}

1369

2138

}

1370

2139

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1371

2140

if(ret == -1){

1372

perror("sigaction");

2141

perror_plus("sigaction");

1373

2142

return EX_OSERR;

1374

2143

}

1375

2144

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

2145

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1377

2146

if(ret == -1){

1378

perror("sigaction");

2147

perror_plus("sigaction");

1379

2148

exitcode = EX_OSERR;

1380

2149

goto end;

1381

2150

}

1382

2151

}

1383

2152

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1384

2153

if(ret == -1){

1385

perror("sigaction");

2154

perror_plus("sigaction");

1386

2155

return EX_OSERR;

1387

2156

}

1388

2157

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

2158

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1390

2159

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

1395

}

1396

1397

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

#ifdef __linux__

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1420

ret = klogctl(8, NULL, 5);

1421

bool restore_loglevel = true;

1422

if(ret == -1){

1423

restore_loglevel = false;

1424

perror("klogctl");

1425

}

1426

#endif /* __linux__ */

1427

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

if(sd < 0){

1430

perror("socket");

1431

exitcode = EX_OSERR;

1432

#ifdef __linux__

1433

if(restore_loglevel){

1434

ret = klogctl(7, NULL, 0);

1435

if(ret == -1){

1436

perror("klogctl");

1437

}

1438

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

goto end;

1447

}

1448

strcpy(network.ifr_name, interface);

1449

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

1450

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1452

#ifdef __linux__

1453

if(restore_loglevel){

1454

ret = klogctl(7, NULL, 0);

1455

if(ret == -1){

1456

perror("klogctl");

1457

}

1458

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1467

goto end;

1468

}

1469

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

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

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

1473

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1477

#ifdef __linux__

1478

if(restore_loglevel){

1479

ret = klogctl(7, NULL, 0);

1480

if(ret == -1){

1481

perror("klogctl");

2160

perror_plus("sigaction");

2161

exitcode = EX_OSERR;

2162

goto end;

2163

}

2164

}

2165

2166

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

2167

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2169

/* Look for any good interfaces */

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2171

alphasort);

2172

if(ret >= 1){

2173

/* Add all found interfaces to interfaces list */

2174

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

2175

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

2176

direntries[i]->d_name);

2177

if(ret_errno != 0){

2178

errno = ret_errno;

2179

perror_plus("argz_add");

2180

continue;

2181

}

2182

if(debug){

2183

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

2184

direntries[i]->d_name);

2185

}

2186

}

2187

free(direntries);

2188

} else {

2189

free(direntries);

2190

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

2191

exitcode = EXIT_FAILURE;

2192

goto end;

2193

}

2194

}

2195

2196

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

2197

{

2198

char *interface = NULL;

2199

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

2200

interface))){

2201

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

2202

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

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

while((interface = argz_next(mc.interfaces,

2208

mc.interfaces_size, interface))){

2209

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

2210

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

2211

interface);

2212

interface = NULL;

1482

2213

}

1483

2214

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

goto end;

1492

}

1493

}

1494

/* sleep checking until interface is running */

1495

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

1496

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

1497

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_RUNNING){

1500

2215

break;

1501

2216

}

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

ret = nanosleep(&sleeptime, NULL);

1504

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

1505

perror("nanosleep");

1506

}

1507

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1514

}

1515

#ifdef __linux__

1516

if(restore_loglevel){

1517

/* Restores kernel loglevel to default */

1518

ret = klogctl(7, NULL, 0);

1519

if(ret == -1){

1520

perror("klogctl");

1521

}

1522

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

2217

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2219

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2222

perror_plus("Failed to bring up interface");

2223

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2229

perror_plus("argz_add");

2230

}

2231

}

2232

}

2233

}

2234

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

2235

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

2236

}

2237

}

2238

2239

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

2240

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

2241

if(debug){

2242

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

2243

mc.interfaces);

2244

}

2245

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

1539

2246

}

1540

2247

1541

2248

if(quit_now){

1542

2249

goto end;

1543

2250

}

1544

2251

1545

ret = init_gnutls_global(pubkey, seckey);

2252

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

1546

2253

if(ret == -1){

1547

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

2254

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

1548

2255

exitcode = EX_UNAVAILABLE;

1549

2256

goto end;

1550

2257

} else {

1555

2262

goto end;

1556

2263

}

1557

2264

2265

if(mkdtemp(tempdir) == NULL){

2266

perror_plus("mkdtemp");

2267

goto end;

2268

}

1558

2269

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2270

1565

2271

if(quit_now){

1566

2272

goto end;

1567

2273

}

1568

2274

1569

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

1570

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

2275

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

2276

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

1571

2277

exitcode = EX_UNAVAILABLE;

1572

2278

goto end;

1573

2279

} else {

1582

2288

/* Connect directly, do not use Zeroconf */

1583

2289

/* (Mainly meant for debugging) */

1584

2290

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

2291

1585

2292

if(address == NULL){

1586

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

2293

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

1587

2294

exitcode = EX_USAGE;

1588

2295

goto end;

1589

2296

}

1592

2299

goto end;

1593

2300

}

1594

2301

1595

uint16_t port;

2302

in_port_t port;

1596

2303

errno = 0;

1597

2304

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

1598

2305

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

1599

or tmpmax != (uint16_t)tmpmax){

1600

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

2306

or tmpmax != (in_port_t)tmpmax){

2307

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

1601

2308

exitcode = EX_USAGE;

1602

2309

goto end;

1603

2310

}

1604

2311

1605

2312

if(quit_now){

1606

2313

goto end;

1607

2314

}

1608

2315

1609

port = (uint16_t)tmpmax;

2316

port = (in_port_t)tmpmax;

1610

2317

*address = '\0';

1611

address = connect_to;

1612

2318

/* Colon in address indicates IPv6 */

1613

2319

int af;

1614

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

2320

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

1615

2321

af = AF_INET6;

2322

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

2323

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

2324

{

2325

connect_to++;

2326

address[-1] = '\0';

2327

}

1616

2328

} else {

1617

2329

af = AF_INET;

1618

2330

}

2331

address = connect_to;

1619

2332

1620

2333

if(quit_now){

1621

2334

goto end;

1622

2335

}

1623

2336

1624

2337

while(not quit_now){

1625

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

2338

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

2339

&mc);

1626

2340

if(quit_now or ret == 0){

1627

2341

break;

1628

2342

}

1629

sleep(15);

1630

};

1631

2343

if(debug){

2344

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

2345

(int)retry_interval);

2346

}

2347

sleep((unsigned int)retry_interval);

2348

}

2349

1632

2350

if (not quit_now){

1633

2351

exitcode = EXIT_SUCCESS;

1634

2352

}

1635

2353

1636

2354

goto end;

1637

2355

}

1638

2356

1650

2368

config.publish_domain = 0;

1651

2369

1652

2370

/* Allocate a new server */

1653

mc.server = avahi_server_new(avahi_simple_poll_get

1654

(mc.simple_poll), &config, NULL,

1655

NULL, &error);

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

1656

2373

1657

2374

/* Free the Avahi configuration data */

1658

2375

avahi_server_config_free(&config);

1660

2377

1661

2378

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

1662

2379

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2380

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

2381

avahi_strerror(ret_errno));

1665

2382

exitcode = EX_UNAVAILABLE;

1666

2383

goto end;

1667

2384

}

1673

2390

/* Create the Avahi service browser */

1674

2391

sb = avahi_s_service_browser_new(mc.server, if_index,

1675

2392

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

NULL, 0, browse_callback, NULL);

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

1677

2395

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2396

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

2397

avahi_strerror(avahi_server_errno(mc.server)));

1680

2398

exitcode = EX_UNAVAILABLE;

1681

2399

goto end;

1682

2400

}

1688

2406

/* Run the main loop */

1689

2407

1690

2408

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2409

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

2410

}

2411

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2414

if(debug){

2415

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

2416

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

2417

}

1695

2418

1696

2419

end:

1697

2420

1698

2421

if(debug){

1699

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

2422

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

1700

2423

}

1701

2424

1702

2425

/* Cleanup things */

2426

free(mc.interfaces);

2427

1703

2428

if(sb != NULL)

1704

2429

avahi_s_service_browser_free(sb);

1705

2430

1706

2431

if(mc.server != NULL)

1707

2432

avahi_server_free(mc.server);

1708

2433

1709

if(mc.simple_poll != NULL)

1710

avahi_simple_poll_free(mc.simple_poll);

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

1711

2436

1712

2437

if(gnutls_initialized){

1713

2438

gnutls_certificate_free_credentials(mc.cred);

1719

2444

gpgme_release(mc.ctx);

1720

2445

}

1721

2446

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

2447

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

2448

has seen */

2449

if(mc.current_server != NULL){

2450

mc.current_server->prev->next = NULL;

2451

while(mc.current_server != NULL){

2452

server *next = mc.current_server->next;

2453

free(mc.current_server);

2454

mc.current_server = next;

1729

2455

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2456

}

2457

2458

/* Re-raise priviliges */

2459

{

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

1739

2476

}

1740

2477

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

2478

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

2479

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

2480

" down\n");

1750

2481

}

1751

2482

}

2483

2484

lower_privileges_permanently();

1752

2485

}

1753

2486

1754

/* Removes the temp directory used by GPGME */

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2489

2490

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

1755

2491

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

and (direntry->d_name[1] == '\0'

1772

or (direntry->d_name[1] == '.'

1773

and direntry->d_name[2] == '\0'))){

1774

continue;

1775

}

2492

struct dirent **direntries = NULL;

2493

struct dirent *direntry = NULL;

2494

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

2495

alphasort);

2496

if (numentries > 0){

2497

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

2498

direntry = direntries[i];

1776

2499

char *fullname = NULL;

1777

2500

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

1778

2501

direntry->d_name);

1779

2502

if(ret < 0){

1780

perror("asprintf");

2503

perror_plus("asprintf");

1781

2504

continue;

1782

2505

}

1783

2506

ret = remove(fullname);

1784

2507

if(ret == -1){

1785

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

1786

strerror(errno));

2508

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

2509

strerror(errno));

1787

2510

}

1788

2511

free(fullname);

1789

2512

}

1790

closedir(d);

2513

}

2514

2515

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

2516

free(direntries);

2517

if (numentries == -1){

2518

perror_plus("scandir");

1791

2519

}

1792

2520

ret = rmdir(tempdir);

1793

2521

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

1794

perror("rmdir");

2522

perror_plus("rmdir");

1795

2523

}

1796

2524

}

1797

2525

1802

2530

&old_sigterm_action,

1803

2531

NULL));

1804

2532

if(ret == -1){

1805

perror("sigaction");

2533

perror_plus("sigaction");

1806

2534

}

1807

2535

do {

1808

2536

ret = raise(signal_received);

1809

2537

} while(ret != 0 and errno == EINTR);

1810

2538

if(ret != 0){

1811

perror("raise");

2539

perror_plus("raise");

1812

2540

abort();

1813

2541

}

1814

2542

TEMP_FAILURE_RETRY(pause());