/mandos/release : revision 237.7.156

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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*/

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

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strtoimax() */

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

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

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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, inet_ntop() */

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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

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114

init_gnutls_session(),

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115

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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130

#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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133

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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136

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 circular linked when ever used */

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

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145

typedef struct server{

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146

const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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149

int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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157

AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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161

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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166

} mandos_context;

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167

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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", .current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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170

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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

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int e = errno;

177

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

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program_invocation_short_name);

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errno = e;

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180

perror(print_text);

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}

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182

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

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

185

va_list ap;

186

va_start (ap, format);

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

189

program_invocation_short_name));

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

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}

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/*

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

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195

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

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* "buffer_length" is how much is already used.

174

197

*/

175

198

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

199

size_t buffer_capacity){

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200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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201

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

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202

if(buffer == NULL){

184

207

return buffer_capacity;

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}

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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

211

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

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int af, server **current_server){

190

213

int ret;

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

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215

if(new_server == NULL){

193

216

perror_plus("malloc");

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return -1;

217

return false;

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218

}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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}

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/* uniqe case of first server */

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if (mc.current_server == NULL){

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/* Special case of first server */

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

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

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} else {

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new_server->next = mc.current_server;

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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(*current_server)->prev = new_server;

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}

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

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

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240

if(ret == -1){

218

241

perror_plus("clock_gettime");

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return -1;

242

return false;

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243

}

221

return 0;

244

return true;

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245

}

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/*

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* Initialize GPGME.

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249

*/

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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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254

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233

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/*

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

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257

*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

249

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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293

}

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294

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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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298

if(rc != GPG_ERR_NO_ERROR){

277

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

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gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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302

}

281

303

282

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

304

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

283

305

rc = gpgme_get_engine_info(&engine_info);

284

306

if(rc != GPG_ERR_NO_ERROR){

285

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

286

gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

287

309

return false;

288

310

}

289

311

while(engine_info != NULL){

295

317

engine_info = engine_info->next;

296

318

}

297

319

if(engine_info == NULL){

298

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

320

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

321

tempdir);

299

322

return false;

300

323

}

301

324

302

325

/* Create new GPGME "context" */

303

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

326

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

304

327

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

307

331

return false;

308

332

}

309

333

320

344

*/

321

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

322

346

size_t crypto_size,

323

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

324

349

gpgme_data_t dh_crypto, dh_plain;

325

350

gpgme_error_t rc;

326

351

ssize_t ret;

328

353

ssize_t plaintext_length = 0;

329

354

330

355

if(debug){

331

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

356

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

332

357

}

333

358

334

359

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

335

360

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

336

361

0);

337

362

if(rc != GPG_ERR_NO_ERROR){

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

340

365

return -1;

341

366

}

342

367

343

368

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

344

369

rc = gpgme_data_new(&dh_plain);

345

370

if(rc != GPG_ERR_NO_ERROR){

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

348

374

gpgme_data_release(dh_crypto);

349

375

return -1;

350

376

}

351

377

352

378

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

353

379

data buffer */

354

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

380

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

355

381

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

358

384

plaintext_length = -1;

359

385

if(debug){

360

386

gpgme_decrypt_result_t result;

361

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

362

388

if(result == NULL){

363

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

389

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

364

390

} else {

365

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

366

result->unsupported_algorithm);

367

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

368

result->wrong_key_usage);

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

369

395

if(result->file_name != NULL){

370

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

396

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

371

397

}

372

398

gpgme_recipient_t recipient;

373

399

recipient = result->recipients;

374

400

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

381

408

recipient = recipient->next;

382

409

}

383

410

}

386

413

}

387

414

388

415

if(debug){

389

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

416

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

390

417

}

391

418

392

419

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

399

426

*plaintext = NULL;

400

427

while(true){

401

428

plaintext_capacity = incbuffer(plaintext,

402

(size_t)plaintext_length,

403

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

404

431

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

408

435

}

409

436

410

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

423

450

}

424

451

425

452

if(debug){

426

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

453

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

427

454

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

428

455

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

429

456

}

441

468

}

442

469

443

470

static const char * safer_gnutls_strerror(int value){

444

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

445

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

446

472

if(ret == NULL)

447

473

ret = "(unknown)";

448

474

return ret;

451

477

/* GnuTLS log function callback */

452

478

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

453

479

const char* string){

454

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

480

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

455

481

}

456

482

457

483

static int init_gnutls_global(const char *pubkeyfilename,

458

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

459

486

int ret;

460

487

461

488

if(debug){

462

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

489

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

463

490

}

464

491

465

492

ret = gnutls_global_init();

466

493

if(ret != GNUTLS_E_SUCCESS){

467

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

468

safer_gnutls_strerror(ret));

494

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

495

safer_gnutls_strerror(ret));

469

496

return -1;

470

497

}

471

498

478

505

}

479

506

480

507

/* OpenPGP credentials */

481

gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

482

509

if(ret != GNUTLS_E_SUCCESS){

483

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

484

from

485

-Wunreachable-code

486

*/

487

safer_gnutls_strerror(ret));

510

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

511

safer_gnutls_strerror(ret));

488

512

gnutls_global_deinit();

489

513

return -1;

490

514

}

491

515

492

516

if(debug){

493

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

494

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

495

seckeyfilename);

517

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

496

521

}

497

522

498

523

ret = gnutls_certificate_set_openpgp_key_file

499

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

500

525

GNUTLS_OPENPGP_FMT_BASE64);

501

526

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

527

fprintf_plus(stderr,

528

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

529

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

530

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

531

safer_gnutls_strerror(ret));

507

532

goto globalfail;

508

533

}

509

534

510

535

/* GnuTLS server initialization */

511

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

512

537

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

515

541

goto globalfail;

516

542

}

517

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

543

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

518

544

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

521

547

goto globalfail;

522

548

}

523

549

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

525

551

526

552

return 0;

527

553

528

554

globalfail:

529

555

530

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

531

557

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

533

559

return -1;

534

560

}

535

561

536

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

537

564

int ret;

538

565

/* GnuTLS session creation */

539

566

do {

543

570

}

544

571

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

545

572

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

548

576

}

549

577

550

578

{

551

579

const char *err;

552

580

do {

553

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

581

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

554

582

if(quit_now){

555

583

gnutls_deinit(*session);

556

584

return -1;

557

585

}

558

586

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

559

587

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

588

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

589

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

590

safer_gnutls_strerror(ret));

563

591

gnutls_deinit(*session);

564

592

return -1;

565

593

}

567

595

568

596

do {

569

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

598

mc->cred);

571

599

if(quit_now){

572

600

gnutls_deinit(*session);

573

601

return -1;

574

602

}

575

603

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

576

604

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

579

607

gnutls_deinit(*session);

580

608

return -1;

581

609

}

583

611

/* ignore client certificate if any. */

584

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

585

613

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

615

588

616

return 0;

589

617

}

593

621

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

594

622

595

623

/* Called when a Mandos server is found */

596

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

624

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

597

625

AvahiIfIndex if_index,

598

int af){

626

int af, mandos_context *mc){

599

627

int ret, tcp_sd = -1;

600

628

ssize_t sret;

601

629

union {

626

654

pf = PF_INET;

627

655

break;

628

656

default:

629

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

657

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

630

658

errno = EINVAL;

631

659

return -1;

632

660

}

633

661

634

ret = init_gnutls_session(&session);

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

635

695

if(ret != 0){

636

696

return -1;

637

697

}

638

698

639

699

if(debug){

640

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

641

"\n", ip, port);

700

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

701

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

642

702

}

643

703

644

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

730

}

671

731

if(ret == 0){

672

732

int e = errno;

673

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

733

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

674

734

errno = e;

675

735

goto mandos_end;

676

736

}

677

737

if(af == AF_INET6){

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

738

to.in6.sin6_port = htons(port);

682

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

740

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

684

-Wunreachable-code*/

741

-Wunreachable-code*/

685

742

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

743

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

744

" incomplete without a network interface\n");

688

745

errno = EINVAL;

689

746

goto mandos_end;

690

747

}

708

765

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

709

766

perror_plus("if_indextoname");

710

767

} else {

711

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

712

ip, interface, port);

768

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

769

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

713

770

}

714

771

} else {

715

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

716

port);

772

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

773

ip, (uintmax_t)port);

717

774

}

718

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

786

perror_plus("inet_ntop");

730

787

} else {

731

788

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

732

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

789

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

733

790

}

734

791

}

735

792

}

763

820

while(true){

764

821

size_t out_size = strlen(out);

765

822

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

766

out_size - written));

823

out_size - written));

767

824

if(ret == -1){

768

825

int e = errno;

769

826

perror_plus("write");

789

846

}

790

847

791

848

if(debug){

792

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

849

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

793

850

}

794

851

795

852

if(quit_now){

796

853

errno = EINTR;

797

854

goto mandos_end;

798

855

}

799

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

856

857

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

858

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

859

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

860

gnutls_transport_set_ptr(session,

861

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

862

803

863

if(quit_now){

804

864

errno = EINTR;

815

875

816

876

if(ret != GNUTLS_E_SUCCESS){

817

877

if(debug){

818

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

878

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

819

879

gnutls_perror(ret);

820

880

}

821

881

errno = EPROTO;

825

885

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

826

886

827

887

if(debug){

828

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

829

ip);

888

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

889

" %s\n", ip);

830

890

}

831

891

832

892

while(true){

837

897

}

838

898

839

899

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

900

buffer_capacity);

841

901

if(buffer_capacity == 0){

842

902

int e = errno;

843

903

perror_plus("incbuffer");

870

930

}

871

931

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

872

932

if(ret < 0){

873

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

933

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

934

"***\n");

874

935

gnutls_perror(ret);

875

936

errno = EPROTO;

876

937

goto mandos_end;

877

938

}

878

939

break;

879

940

default:

880

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

881

" encrypted session with Mandos server\n");

941

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

942

" encrypted session with Mandos server\n");

882

943

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

944

errno = EIO;

884

945

goto mandos_end;

889

950

}

890

951

891

952

if(debug){

892

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

953

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

893

954

}

894

955

895

956

if(quit_now){

907

968

908

969

if(buffer_length > 0){

909

970

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

913

973

if(decrypted_buffer_size >= 0){

914

974

915

975

written = 0;

925

985

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

926

986

int e = errno;

927

987

if(debug){

928

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

929

strerror(errno));

988

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

989

strerror(errno));

930

990

}

931

991

errno = e;

932

992

goto mandos_end;

976

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

977

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

978

1038

flags,

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

981

1043

982

1044

/* Called whenever a service has been resolved successfully or

983

1045

timed out */

989

1051

switch(event){

990

1052

default:

991

1053

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1054

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

1055

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

1056

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

995

1059

break;

996

1060

997

1061

case AVAHI_RESOLVER_FOUND:

999

1063

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1064

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

1001

1065

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1066

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

1067

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

1068

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

1005

1069

}

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1008

1074

if(ret == 0){

1009

avahi_simple_poll_quit(mc.simple_poll);

1075

avahi_simple_poll_quit(simple_poll);

1010

1076

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1080

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

1081

" list\n", name);

1082

}

1013

1083

}

1014

1084

}

1015

1085

}

1025

1095

const char *domain,

1026

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1027

1097

flags,

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1030

1102

1031

1103

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

1032

1104

is removed from the LAN */

1039

1111

default:

1040

1112

case AVAHI_BROWSER_FAILURE:

1041

1113

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1114

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1045

1118

return;

1046

1119

1047

1120

case AVAHI_BROWSER_NEW:

1050

1123

the callback function is called the Avahi server will free the

1051

1124

resolver for us. */

1052

1125

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

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

1057

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

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1130

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

1131

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

1058

1134

break;

1059

1135

1060

1136

case AVAHI_BROWSER_REMOVE:

1063

1139

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1140

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1141

if(debug){

1066

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

1142

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

1143

" searching...\n");

1067

1144

}

1068

1145

break;

1069

1146

}

1070

1147

}

1071

1148

1072

/* Signal handler that stops main loop after sigterm has been called */

1149

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

1073

1150

static void handle_sigterm(int sig){

1074

1151

if(quit_now){

1075

1152

return;

1078

1155

signal_received = sig;

1079

1156

int old_errno = errno;

1080

1157

/* set main loop to exit */

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1083

1160

}

1084

1161

errno = old_errno;

1085

1162

}

1086

1163

1164

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

1165

int ret;

1166

error_t ret_errno;

1167

1168

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

1169

if(s < 0){

1170

ret_errno = errno;

1171

perror_plus("socket");

1172

errno = ret_errno;

1173

return false;

1174

}

1175

strcpy(ifr->ifr_name, ifname);

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

if(ret == -1){

1178

if(debug){

1179

ret_errno = errno;

1180

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

}

1183

return false;

1184

}

1185

return true;

1186

}

1187

1188

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

1189

1190

/* Reject the loopback device */

1191

if(ifr->ifr_flags & IFF_LOOPBACK){

1192

if(debug){

1193

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

1194

ifname);

1195

}

1196

return false;

1197

}

1198

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

1199

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

1200

if(debug){

1201

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

1202

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

1203

}

1204

return true;

1205

}

1206

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

1207

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

1208

if(debug){

1209

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1210

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

1211

}

1212

return false;

1213

}

1214

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

1215

if(ifr->ifr_flags & IFF_NOARP){

1216

if(debug){

1217

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

1218

ifname);

1219

}

1220

return false;

1221

}

1222

1223

/* Accept this device */

1224

if(debug){

1225

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

1226

}

1227

return true;

1228

}

1229

1087

1230

/*

1088

1231

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

1089

1232

* corresponds to an acceptable network device.

1090

1233

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

1091

1234

*/

1092

1235

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

1236

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

1096

1237

return 0;

1097

1238

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1239

1240

struct ifreq ifr;

1241

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

1242

if(debug){

1243

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

1244

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

1245

}

1246

return 0;

1247

}

1248

1249

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

1250

return 0;

1188

1251

}

1189

1252

return 1;

1190

1253

}

1191

1254

1255

/*

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

1285

}

1286

1192

1287

int notdotentries(const struct dirent *direntry){

1193

1288

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

1194

1289

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

1200

1295

return 1;

1201

1296

}

1202

1297

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1298

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

1299

int runnable_hook(const struct dirent *direntry){

1300

int ret;

1301

size_t sret;

1302

struct stat st;

1303

1304

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

1305

/* Empty name? */

1306

return 0;

1307

}

1308

1309

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

1310

"abcdefghijklmnopqrstuvwxyz"

1311

"0123456789"

1312

"_-");

1313

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

1314

/* Contains non-allowed characters */

1315

if(debug){

1316

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

1317

direntry->d_name);

1318

}

1319

return 0;

1320

}

1321

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1330

if(ret == -1){

1331

if(debug){

1332

perror_plus("Could not stat hook");

1333

}

1334

return 0;

1335

}

1336

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

1337

/* Not a regular file */

1338

if(debug){

1339

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

1340

direntry->d_name);

1341

}

1342

return 0;

1343

}

1344

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

1345

/* Not executable */

1346

if(debug){

1347

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

1348

direntry->d_name);

1349

}

1350

return 0;

1351

}

1352

if(debug){

1353

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

1354

direntry->d_name);

1355

}

1356

return 1;

1357

}

1358

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1204

1361

int ret;

1205

1362

struct timespec now;

1206

1363

struct timespec waited_time;

1207

1364

intmax_t block_time;

1208

1365

1209

1366

while(true){

1210

if(mc.current_server == NULL){

1367

if(mc->current_server == NULL){

1211

1368

if (debug){

1212

fprintf(stderr, "Wait until first server is found. No timeout!\n");

1369

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

1370

" No timeout!\n");

1213

1371

}

1214

1372

ret = avahi_simple_poll_iterate(s, -1);

1215

1373

} else {

1216

1374

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1375

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

1376

" it, or wait\n");

1218

1377

}

1219

1378

/* the current time */

1220

1379

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

1383

}

1225

1384

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

1226

1385

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1386

waited_time.tv_sec = (now.tv_sec

1387

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

1388

waited_time.tv_nsec = (now.tv_nsec

1389

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

1390

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

1391

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

1392

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

1393

block_time = ((retry_interval

1394

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

1395

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

1396

1232

1397

if (debug){

1233

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

1398

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

1399

block_time);

1234

1400

}

1235

1401

1236

1402

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

1241

1407

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1408

avahi_simple_poll_quit(s);

1243

1409

return 0;

1244

1410

}

1245

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

1411

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1246

1413

if(ret == -1){

1247

1414

perror_plus("clock_gettime");

1248

1415

return -1;

1249

1416

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1417

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

1418

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

1419

servers, but don't block */

1252

1420

}

1253

1421

1254

1422

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

1255

1423

}

1256

1424

if(ret != 0){

1257

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

1425

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

1258

1426

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

1259

1427

}

1260

1428

}

1261

1429

}

1262

1430

}

1263

1431

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

const float delay){

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

1507

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1566

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1578

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1615

}

1616

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

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

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

1787

}

1788

1264

1789

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1265

1794

AvahiSServiceBrowser *sb = NULL;

1266

int error;

1795

error_t ret_errno;

1267

1796

int ret;

1268

1797

intmax_t tmpmax;

1269

1798

char *tmp;

1270

1799

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

1272

struct ifreq network;

1273

int sd = -1;

1274

bool take_down_interface = false;

1275

uid_t uid;

1276

gid_t gid;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1277

1802

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

1278

1803

bool tempdir_created = false;

1279

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1280

1805

const char *seckey = PATHDIR "/" SECKEY;

1281

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1282

1809

1283

1810

bool gnutls_initialized = false;

1284

1811

bool gpgme_initialized = false;

1285

1812

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1813

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

1814

retrying the same server again */

1287

1815

1288

1816

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

1817

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1345

1873

.group = 2 },

1346

1874

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

1347

1875

.arg = "SECONDS",

1348

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

1876

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

1877

.group = 2 },

1878

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

1879

.arg = "DIR",

1880

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

1349

1881

.group = 2 },

1350

1882

/*

1351

1883

* These reproduce what we would get without ARGP_NO_HELP

1370

1902

connect_to = arg;

1371

1903

break;

1372

1904

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

1373

interface = arg;

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1374

1910

break;

1375

1911

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

1376

1912

seckey = arg;

1400

1936

errno = 0;

1401

1937

retry_interval = strtod(arg, &tmp);

1402

1938

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

1403

or (retry_interval * 1000) > INT_MAX){

1939

or (retry_interval * 1000) > INT_MAX

1940

or retry_interval < 0){

1404

1941

argp_error(state, "Bad retry interval");

1405

1942

}

1406

1943

break;

1944

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

1945

hookdir = arg;

1946

break;

1407

1947

/*

1408

1948

* These reproduce what we would get without ARGP_NO_HELP

1409

1949

*/

1415

1955

argp_state_help(state, state->out_stream,

1416

1956

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

1957

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

1418

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

1958

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

1419

1959

exit(argp_err_exit_status);

1420

1960

break;

1421

1961

default:

1444

1984

goto end;

1445

1985

}

1446

1986

}

1987

1988

{

1989

/* Work around Debian bug #633582:

1990

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

1991

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

1994

struct stat st;

1995

1996

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

1997

int seckey_fd = open(seckey, O_RDONLY);

1998

if(seckey_fd == -1){

1999

perror_plus("open");

2000

} else {

2001

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

2002

if(ret == -1){

2003

perror_plus("fstat");

2004

} else {

2005

if(S_ISREG(st.st_mode)

2006

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

2007

ret = fchown(seckey_fd, uid, gid);

2008

if(ret == -1){

2009

perror_plus("fchown");

2010

}

2011

}

2012

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2014

}

2015

}

2016

2017

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

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2019

if(pubkey_fd == -1){

2020

perror_plus("open");

2021

} else {

2022

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

2023

if(ret == -1){

2024

perror_plus("fstat");

2025

} else {

2026

if(S_ISREG(st.st_mode)

2027

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

2028

ret = fchown(pubkey_fd, uid, gid);

2029

if(ret == -1){

2030

perror_plus("fchown");

2031

}

2032

}

2033

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2038

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

2056

}

2057

}

2058

}

2059

2060

/* Run network hooks */

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2077

}

1447

2078

1448

2079

if(not debug){

1449

2080

avahi_set_log_function(empty_log);

1450

2081

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1476

2082

1477

2083

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

1478

2084

from the signal handler */

1479

2085

/* Initialize the pseudo-RNG for Avahi */

1480

2086

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

1481

mc.simple_poll = avahi_simple_poll_new();

1482

if(mc.simple_poll == NULL){

1483

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

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

2089

fprintf_plus(stderr,

2090

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

1484

2091

exitcode = EX_UNAVAILABLE;

1485

2092

goto end;

1486

2093

}

1548

2155

}

1549

2156

}

1550

2157

1551

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

1552

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

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

if(if_index == 0){

1555

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

1556

exitcode = EX_UNAVAILABLE;

1557

goto end;

1558

}

1559

1560

if(quit_now){

1561

goto end;

1562

}

1563

1564

/* Re-raise priviliges */

1565

errno = 0;

1566

ret = seteuid(0);

1567

if(ret == -1){

1568

perror_plus("seteuid");

1569

}

1570

1571

#ifdef __linux__

1572

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1573

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

1574

ret = klogctl(8, NULL, 5);

1575

bool restore_loglevel = true;

1576

if(ret == -1){

1577

restore_loglevel = false;

1578

perror_plus("klogctl");

1579

}

1580

#endif /* __linux__ */

1581

1582

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

if(sd < 0){

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1586

#ifdef __linux__

1587

if(restore_loglevel){

1588

ret = klogctl(7, NULL, 0);

1589

if(ret == -1){

1590

perror_plus("klogctl");

1591

}

1592

}

1593

#endif /* __linux__ */

1594

/* Lower privileges */

1595

errno = 0;

1596

ret = seteuid(uid);

1597

if(ret == -1){

1598

perror_plus("seteuid");

1599

}

1600

goto end;

1601

}

1602

strcpy(network.ifr_name, interface);

1603

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

1604

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1606

#ifdef __linux__

1607

if(restore_loglevel){

1608

ret = klogctl(7, NULL, 0);

1609

if(ret == -1){

1610

perror_plus("klogctl");

1611

}

1612

}

1613

#endif /* __linux__ */

1614

exitcode = EX_OSERR;

1615

/* Lower privileges */

1616

errno = 0;

1617

ret = seteuid(uid);

1618

if(ret == -1){

1619

perror_plus("seteuid");

1620

}

1621

goto end;

1622

}

1623

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

1624

network.ifr_flags |= IFF_UP;

1625

take_down_interface = true;

1626

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

1627

if(ret == -1){

1628

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1631

#ifdef __linux__

1632

if(restore_loglevel){

1633

ret = klogctl(7, NULL, 0);

1634

if(ret == -1){

1635

perror_plus("klogctl");

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

1636

2204

}

1637

2205

}

1638

#endif /* __linux__ */

1639

/* Lower privileges */

1640

errno = 0;

1641

ret = seteuid(uid);

1642

if(ret == -1){

1643

perror_plus("seteuid");

1644

}

1645

goto end;

1646

}

1647

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1649

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

1650

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

1651

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_RUNNING){

1654

2206

break;

1655

2207

}

1656

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

ret = nanosleep(&sleeptime, NULL);

1658

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

1659

perror_plus("nanosleep");

1660

}

1661

}

1662

if(not take_down_interface){

1663

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

1664

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

1665

if(ret == -1){

1666

perror_plus("close");

1667

}

1668

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1673

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1676

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

1686

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

1691

}

1692

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

1693

2233

}

1694

2234

1695

2235

if(quit_now){

1696

2236

goto end;

1697

2237

}

1698

2238

1699

ret = init_gnutls_global(pubkey, seckey);

2239

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

1700

2240

if(ret == -1){

1701

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

2241

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

1702

2242

exitcode = EX_UNAVAILABLE;

1703

2243

goto end;

1704

2244

} else {

1719

2259

goto end;

1720

2260

}

1721

2261

1722

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

1723

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

2262

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

2263

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

1724

2264

exitcode = EX_UNAVAILABLE;

1725

2265

goto end;

1726

2266

} else {

1735

2275

/* Connect directly, do not use Zeroconf */

1736

2276

/* (Mainly meant for debugging) */

1737

2277

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

2278

1738

2279

if(address == NULL){

1739

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

2280

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

1740

2281

exitcode = EX_USAGE;

1741

2282

goto end;

1742

2283

}

1745

2286

goto end;

1746

2287

}

1747

2288

1748

uint16_t port;

2289

in_port_t port;

1749

2290

errno = 0;

1750

2291

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

1751

2292

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

1752

or tmpmax != (uint16_t)tmpmax){

1753

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

2293

or tmpmax != (in_port_t)tmpmax){

2294

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

1754

2295

exitcode = EX_USAGE;

1755

2296

goto end;

1756

2297

}

1757

2298

1758

2299

if(quit_now){

1759

2300

goto end;

1760

2301

}

1761

2302

1762

port = (uint16_t)tmpmax;

2303

port = (in_port_t)tmpmax;

1763

2304

*address = '\0';

1764

address = connect_to;

1765

2305

/* Colon in address indicates IPv6 */

1766

2306

int af;

1767

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

2307

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

1768

2308

af = AF_INET6;

2309

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

2310

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

2311

{

2312

connect_to++;

2313

address[-1] = '\0';

2314

}

1769

2315

} else {

1770

2316

af = AF_INET;

1771

2317

}

2318

address = connect_to;

1772

2319

1773

2320

if(quit_now){

1774

2321

goto end;

1775

2322

}

1776

2323

1777

2324

while(not quit_now){

1778

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

2325

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

2326

&mc);

1779

2327

if(quit_now or ret == 0){

1780

2328

break;

1781

2329

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

2330

if(debug){

2331

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

2332

(int)retry_interval);

2333

}

2334

sleep((int)retry_interval);

2335

}

2336

1785

2337

if (not quit_now){

1786

2338

exitcode = EXIT_SUCCESS;

1787

2339

}

1788

2340

1789

2341

goto end;

1790

2342

}

1791

2343

1803

2355

config.publish_domain = 0;

1804

2356

1805

2357

/* Allocate a new server */

1806

mc.server = avahi_server_new(avahi_simple_poll_get

1807

(mc.simple_poll), &config, NULL,

1808

NULL, &error);

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

1809

2360

1810

2361

/* Free the Avahi configuration data */

1811

2362

avahi_server_config_free(&config);

1813

2364

1814

2365

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

1815

2366

if(mc.server == NULL){

1816

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

1817

avahi_strerror(error));

2367

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

2368

avahi_strerror(ret_errno));

1818

2369

exitcode = EX_UNAVAILABLE;

1819

2370

goto end;

1820

2371

}

1826

2377

/* Create the Avahi service browser */

1827

2378

sb = avahi_s_service_browser_new(mc.server, if_index,

1828

2379

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1829

NULL, 0, browse_callback, NULL);

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

1830

2382

if(sb == NULL){

1831

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

1832

avahi_strerror(avahi_server_errno(mc.server)));

2383

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

2384

avahi_strerror(avahi_server_errno(mc.server)));

1833

2385

exitcode = EX_UNAVAILABLE;

1834

2386

goto end;

1835

2387

}

1841

2393

/* Run the main loop */

1842

2394

1843

2395

if(debug){

1844

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

2396

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

1845

2397

}

1846

2398

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

1848

2401

if(debug){

1849

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

1850

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

2402

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

2403

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

1851

2404

}

1852

2405

1853

2406

end:

1854

2407

1855

2408

if(debug){

1856

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

2409

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

1857

2410

}

1858

2411

1859

2412

/* Cleanup things */

2413

free(mc.interfaces);

2414

1860

2415

if(sb != NULL)

1861

2416

avahi_s_service_browser_free(sb);

1862

2417

1863

2418

if(mc.server != NULL)

1864

2419

avahi_server_free(mc.server);

1865

2420

1866

if(mc.simple_poll != NULL)

1867

avahi_simple_poll_free(mc.simple_poll);

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

1868

2423

1869

2424

if(gnutls_initialized){

1870

2425

gnutls_certificate_free_credentials(mc.cred);

1875

2430

if(gpgme_initialized){

1876

2431

gpgme_release(mc.ctx);

1877

2432

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

2433

2434

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

2435

has seen */

1880

2436

if(mc.current_server != NULL){

1881

2437

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

1882

2438

while(mc.current_server != NULL){

1886

2442

}

1887

2443

}

1888

2444

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

1892

errno = 0;

1893

ret = seteuid(0);

1894

if(ret == -1){

1895

perror_plus("seteuid");

1896

}

1897

if(geteuid() == 0){

1898

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

1899

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

1902

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

1903

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

1904

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2445

/* Re-raise priviliges */

2446

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

1906

2463

}

1907

2464

}

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

2465

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

2466

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

2467

" down\n");

1917

2468

}

1918

2469

}

2470

2471

lower_privileges_permanently();

1919

2472

}

1920

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2476

1921

2477

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

1922

2478

if(tempdir_created){

1923

2479

struct dirent **direntries = NULL;

1924

2480

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

2481

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

2482

alphasort);

2483

if (numentries > 0){

2484

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

1928

2485

direntry = direntries[i];

1929

2486

char *fullname = NULL;

1930

2487

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

1935

2492

}

1936

2493

ret = remove(fullname);

1937

2494

if(ret == -1){

1938

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

1939

strerror(errno));

2495

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

2496

strerror(errno));

1940

2497

}

1941

2498

free(fullname);

1942

2499

}

1943

2500

}

1944

2501

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

2502

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

1946

2503

free(direntries);

1947

if (ret == -1){

2504

if (numentries == -1){

1948

2505

perror_plus("scandir");

1949

2506

}

1950

2507

ret = rmdir(tempdir);