/mandos/trunk : revision 237.4.42

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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 <time.h> /* nanosleep(), time() */

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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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if_nametoindex(), IF_NAMESIZE */

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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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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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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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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*/

201

__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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*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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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

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return false;

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}

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/* Special case of first server */

243

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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} else {

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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/*

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* Initialize GPGME.

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259

*/

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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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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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bool import_key(const char *filename){

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bool import_key(const char * const filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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

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if(fd == -1){

186

perror("open");

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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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283

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){

206

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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311

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));

312

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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315

}

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

317

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

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rc = gpgme_get_engine_info(&engine_info);

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319

if(rc != GPG_ERR_NO_ERROR){

228

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

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gpgme_strsource(rc), gpgme_strerror(rc));

320

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

321

gpgme_strsource(rc), gpgme_strerror(rc));

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322

return false;

231

323

}

232

324

while(engine_info != NULL){

238

330

engine_info = engine_info->next;

239

331

}

240

332

if(engine_info == NULL){

241

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

333

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

334

tempdir);

242

335

return false;

243

336

}

244

337

245

338

/* Create new GPGME "context" */

246

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

339

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

247

340

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

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

343

gpgme_strerror(rc));

250

344

return false;

251

345

}

252

346

261

355

* Decrypt OpenPGP data.

262

356

* Returns -1 on error

263

357

*/

358

__attribute__((nonnull, warn_unused_result))

264

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

360

size_t crypto_size,

266

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

267

363

gpgme_data_t dh_crypto, dh_plain;

268

364

gpgme_error_t rc;

269

365

ssize_t ret;

271

367

ssize_t plaintext_length = 0;

272

368

273

369

if(debug){

274

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

370

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

275

371

}

276

372

277

373

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

278

374

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

375

0);

280

376

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

283

379

return -1;

284

380

}

285

381

286

382

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

287

383

rc = gpgme_data_new(&dh_plain);

288

384

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

385

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

291

388

gpgme_data_release(dh_crypto);

292

389

return -1;

293

390

}

294

391

295

392

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

296

393

data buffer */

297

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

394

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

298

395

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

396

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

301

398

plaintext_length = -1;

302

399

if(debug){

303

400

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

305

402

if(result == NULL){

306

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

403

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

307

404

} else {

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

405

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

406

result->unsupported_algorithm);

407

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

408

result->wrong_key_usage);

312

409

if(result->file_name != NULL){

313

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

410

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

314

411

}

315

412

gpgme_recipient_t recipient;

316

413

recipient = result->recipients;

317

414

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

415

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

416

gpgme_pubkey_algo_name

417

(recipient->pubkey_algo));

418

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

419

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

420

recipient->status == GPG_ERR_NO_SECKEY

421

? "No" : "Yes");

324

422

recipient = recipient->next;

325

423

}

326

424

}

329

427

}

330

428

331

429

if(debug){

332

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

430

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

333

431

}

334

432

335

433

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

336

434

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

337

perror("gpgme_data_seek");

435

perror_plus("gpgme_data_seek");

338

436

plaintext_length = -1;

339

437

goto decrypt_end;

340

438

}

342

440

*plaintext = NULL;

343

441

while(true){

344

442

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

443

(size_t)plaintext_length,

444

plaintext_capacity);

347

445

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

446

perror_plus("incbuffer");

447

plaintext_length = -1;

448

goto decrypt_end;

351

449

}

352

450

353

451

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

456

break;

359

457

}

360

458

if(ret < 0){

361

perror("gpgme_data_read");

459

perror_plus("gpgme_data_read");

362

460

plaintext_length = -1;

363

461

goto decrypt_end;

364

462

}

366

464

}

367

465

368

466

if(debug){

369

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

467

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

370

468

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

371

469

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

372

470

}

383

481

return plaintext_length;

384

482

}

385

483

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

389

487

if(ret == NULL)

390

488

ret = "(unknown)";

391

489

return ret;

392

490

}

393

491

394

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

395

494

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

396

495

const char* string){

397

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

496

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

398

497

}

399

498

499

__attribute__((nonnull, warn_unused_result))

400

500

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

402

503

int ret;

403

504

404

505

if(debug){

405

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

506

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

406

507

}

407

508

408

509

ret = gnutls_global_init();

409

510

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

511

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

512

safer_gnutls_strerror(ret));

412

513

return -1;

413

514

}

414

515

421

522

}

422

523

423

524

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

526

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

527

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

528

safer_gnutls_strerror(ret));

431

529

gnutls_global_deinit();

432

530

return -1;

433

531

}

434

532

435

533

if(debug){

436

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

437

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

438

seckeyfilename);

534

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

439

538

}

440

539

441

540

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

443

542

GNUTLS_OPENPGP_FMT_BASE64);

444

543

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

544

fprintf_plus(stderr,

545

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

546

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

547

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

548

safer_gnutls_strerror(ret));

450

549

goto globalfail;

451

550

}

452

551

453

552

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

455

554

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

458

558

goto globalfail;

459

559

}

460

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

560

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

461

561

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

562

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

563

safer_gnutls_strerror(ret));

464

564

goto globalfail;

465

565

}

466

566

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

468

568

469

569

return 0;

470

570

471

571

globalfail:

472

572

473

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

474

574

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

476

576

return -1;

477

577

}

478

578

479

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

480

582

int ret;

481

583

/* GnuTLS session creation */

482

584

do {

486

588

}

487

589

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

488

590

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

491

594

}

492

595

493

596

{

494

597

const char *err;

495

598

do {

496

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

599

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

497

600

if(quit_now){

498

601

gnutls_deinit(*session);

499

602

return -1;

500

603

}

501

604

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

502

605

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

safer_gnutls_strerror(ret));

606

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

607

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

608

safer_gnutls_strerror(ret));

506

609

gnutls_deinit(*session);

507

610

return -1;

508

611

}

510

613

511

614

do {

512

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

616

mc->cred);

514

617

if(quit_now){

515

618

gnutls_deinit(*session);

516

619

return -1;

517

620

}

518

621

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

519

622

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

623

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

624

safer_gnutls_strerror(ret));

522

625

gnutls_deinit(*session);

523

626

return -1;

524

627

}

526

629

/* ignore client certificate if any. */

527

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

631

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

530

633

531

634

return 0;

532

635

}

536

639

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

537

640

538

641

/* Called when a Mandos server is found */

539

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

642

__attribute__((nonnull, warn_unused_result))

643

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

540

644

AvahiIfIndex if_index,

541

int af){

645

int af, mandos_context *mc){

542

646

int ret, tcp_sd = -1;

543

647

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

648

struct sockaddr_storage to;

548

649

char *buffer = NULL;

549

650

char *decrypted_buffer = NULL;

550

651

size_t buffer_length = 0;

569

670

pf = PF_INET;

570

671

break;

571

672

default:

572

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

673

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

573

674

errno = EINVAL;

574

675

return -1;

575

676

}

576

677

577

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

578

711

if(ret != 0){

579

712

return -1;

580

713

}

581

714

582

715

if(debug){

583

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

584

"\n", ip, port);

716

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

717

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

585

718

}

586

719

587

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

721

if(tcp_sd < 0){

589

722

int e = errno;

590

perror("socket");

723

perror_plus("socket");

591

724

errno = e;

592

725

goto mandos_end;

593

726

}

599

732

600

733

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

601

734

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

735

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

736

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

604

737

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

738

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

739

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

607

740

}

608

741

if(ret < 0 ){

609

742

int e = errno;

610

perror("inet_pton");

743

perror_plus("inet_pton");

611

744

errno = e;

612

745

goto mandos_end;

613

746

}

614

747

if(ret == 0){

615

748

int e = errno;

616

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

749

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

617

750

errno = e;

618

751

goto mandos_end;

619

752

}

620

753

if(af == AF_INET6){

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

628

757

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

758

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

759

" incomplete without a network interface\n");

631

760

errno = EINVAL;

632

761

goto mandos_end;

633

762

}

634

763

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

636

765

}

637

766

} else {

638

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

639

-Wconversion and

640

-Wunreachable-code */

767

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

641

768

}

642

769

643

770

if(quit_now){

649

776

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

650

777

char interface[IF_NAMESIZE];

651

778

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

652

perror("if_indextoname");

779

perror_plus("if_indextoname");

653

780

} else {

654

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

655

ip, interface, port);

781

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

782

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

656

783

}

657

784

} else {

658

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

659

port);

785

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

786

ip, (uintmax_t)port);

660

787

}

661

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

790

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

667

795

} else {

668

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

669

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

670

800

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

677

807

}

678

808

}

679

809

683

813

}

684

814

685

815

if(af == AF_INET6){

686

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

816

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

817

sizeof(struct sockaddr_in6));

687

818

} else {

688

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

819

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

820

sizeof(struct sockaddr_in));

689

821

}

690

822

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

823

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

824

int e = errno;

825

perror_plus("connect");

826

errno = e;

827

}

694

828

goto mandos_end;

695

829

}

696

830

704

838

while(true){

705

839

size_t out_size = strlen(out);

706

840

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

707

out_size - written));

841

out_size - written));

708

842

if(ret == -1){

709

843

int e = errno;

710

perror("write");

844

perror_plus("write");

711

845

errno = e;

712

846

goto mandos_end;

713

847

}

730

864

}

731

865

732

866

if(debug){

733

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

867

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

734

868

}

735

869

736

870

if(quit_now){

738

872

goto mandos_end;

739

873

}

740

874

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

880

743

881

if(quit_now){

744

882

errno = EINTR;

755

893

756

894

if(ret != GNUTLS_E_SUCCESS){

757

895

if(debug){

758

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

896

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

759

897

gnutls_perror(ret);

760

898

}

761

899

errno = EPROTO;

765

903

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

766

904

767

905

if(debug){

768

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

769

ip);

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

770

908

}

771

909

772

910

while(true){

777

915

}

778

916

779

917

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

918

buffer_capacity);

781

919

if(buffer_capacity == 0){

782

920

int e = errno;

783

perror("incbuffer");

921

perror_plus("incbuffer");

784

922

errno = e;

785

923

goto mandos_end;

786

924

}

810

948

}

811

949

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

812

950

if(ret < 0){

813

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

951

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

952

"***\n");

814

953

gnutls_perror(ret);

815

954

errno = EPROTO;

816

955

goto mandos_end;

817

956

}

818

957

break;

819

958

default:

820

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

821

" encrypted session with Mandos server\n");

959

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

960

" encrypted session with Mandos server\n");

822

961

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

962

errno = EIO;

824

963

goto mandos_end;

829

968

}

830

969

831

970

if(debug){

832

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

971

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

833

972

}

834

973

835

974

if(quit_now){

847

986

848

987

if(buffer_length > 0){

849

988

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

853

991

if(decrypted_buffer_size >= 0){

854

992

855

993

written = 0;

865

1003

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

866

1004

int e = errno;

867

1005

if(debug){

868

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

869

strerror(errno));

1006

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

1007

strerror(errno));

870

1008

}

871

1009

errno = e;

872

1010

goto mandos_end;

891

1029

if(e == 0){

892

1030

e = errno;

893

1031

}

894

perror("close");

1032

perror_plus("close");

895

1033

}

896

1034

gnutls_deinit(session);

1035

errno = e;

897

1036

if(quit_now){

898

e = EINTR;

1037

errno = EINTR;

899

1038

retval = -1;

900

1039

}

901

errno = e;

902

1040

}

903

1041

return retval;

904

1042

}

905

1043

1044

__attribute__((nonnull))

906

1045

static void resolve_callback(AvahiSServiceResolver *r,

907

1046

AvahiIfIndex interface,

908

1047

AvahiProtocol proto,

916

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1057

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

921

1062

922

1063

/* Called whenever a service has been resolved successfully or

923

1064

timed out */

929

1070

switch(event){

930

1071

default:

931

1072

case AVAHI_RESOLVER_FAILURE:

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

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

1075

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

935

1078

break;

936

1079

937

1080

case AVAHI_RESOLVER_FOUND:

939

1082

char ip[AVAHI_ADDRESS_STR_MAX];

940

1083

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

941

1084

if(debug){

942

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

943

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

944

ip, (intmax_t)interface, port);

1085

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

1086

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

1087

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

945

1088

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

948

1093

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1095

} else {

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

950

1102

}

951

1103

}

952

1104

}

962

1114

const char *domain,

963

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1116

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

967

1121

968

1122

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

969

1123

is removed from the LAN */

976

1130

default:

977

1131

case AVAHI_BROWSER_FAILURE:

978

1132

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1133

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

982

1137

return;

983

1138

984

1139

case AVAHI_BROWSER_NEW:

987

1142

the callback function is called the Avahi server will free the

988

1143

resolver for us. */

989

1144

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1149

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

1150

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

995

1153

break;

996

1154

997

1155

case AVAHI_BROWSER_REMOVE:

1000

1158

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1159

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1160

if(debug){

1003

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

1161

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

1162

" searching...\n");

1004

1163

}

1005

1164

break;

1006

1165

}

1007

1166

}

1008

1167

1009

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

1168

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

1010

1169

static void handle_sigterm(int sig){

1011

1170

if(quit_now){

1012

1171

return;

1014

1173

quit_now = 1;

1015

1174

signal_received = sig;

1016

1175

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1176

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1179

}

1180

errno = old_errno;

1181

}

1182

1183

__attribute__((nonnull, warn_unused_result))

1184

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

1185

int ret;

1186

error_t ret_errno;

1187

1188

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

1189

if(s < 0){

1190

ret_errno = errno;

1191

perror_plus("socket");

1192

errno = ret_errno;

1193

return false;

1194

}

1195

strcpy(ifr->ifr_name, ifname);

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

if(ret == -1){

1198

if(debug){

1199

ret_errno = errno;

1200

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1202

}

1203

return false;

1204

}

1205

return true;

1206

}

1207

1208

__attribute__((nonnull, warn_unused_result))

1209

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

1210

1211

/* Reject the loopback device */

1212

if(ifr->ifr_flags & IFF_LOOPBACK){

1213

if(debug){

1214

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

1215

ifname);

1216

}

1217

return false;

1218

}

1219

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

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return true;

1226

}

1227

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

1228

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

1229

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1232

}

1233

return false;

1234

}

1235

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

1236

if(ifr->ifr_flags & IFF_NOARP){

1237

if(debug){

1238

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

1239

ifname);

1240

}

1241

return false;

1242

}

1243

1244

/* Accept this device */

1245

if(debug){

1246

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

1247

}

1248

return true;

1249

}

1250

1251

/*

1252

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

1253

* corresponds to an acceptable network device.

1254

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

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

int good_interface(const struct dirent *if_entry){

1258

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

1259

return 0;

1260

}

1261

1262

struct ifreq ifr;

1263

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

1264

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1273

}

1274

return 1;

1275

}

1276

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

int notdotentries(const struct dirent *direntry){

1313

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

1314

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

1315

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

1316

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

1317

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

1318

return 0;

1319

}

1320

return 1;

1321

}

1322

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1325

int runnable_hook(const struct dirent *direntry){

1326

int ret;

1327

size_t sret;

1328

struct stat st;

1329

1330

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

1331

/* Empty name? */

1332

return 0;

1333

}

1334

1335

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

1336

"abcdefghijklmnopqrstuvwxyz"

1337

"0123456789"

1338

"_-");

1339

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

1340

/* Contains non-allowed characters */

1341

if(debug){

1342

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

1343

direntry->d_name);

1344

}

1345

return 0;

1346

}

1347

1348

char *fullname = NULL;

1349

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

1350

if(ret < 0){

1351

perror_plus("asprintf");

1352

return 0;

1353

}

1354

1355

ret = stat(fullname, &st);

1356

if(ret == -1){

1357

if(debug){

1358

perror_plus("Could not stat hook");

1359

}

1360

return 0;

1361

}

1362

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

1363

/* Not a regular file */

1364

if(debug){

1365

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

1366

direntry->d_name);

1367

}

1368

return 0;

1369

}

1370

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

1371

/* Not executable */

1372

if(debug){

1373

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

1374

direntry->d_name);

1375

}

1376

return 0;

1377

}

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

return 1;

1383

}

1384

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1388

int ret;

1389

struct timespec now;

1390

struct timespec waited_time;

1391

intmax_t block_time;

1392

1393

while(true){

1394

if(mc->current_server == NULL){

1395

if(debug){

1396

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

1397

" No timeout!\n");

1398

}

1399

ret = avahi_simple_poll_iterate(s, -1);

1400

} else {

1401

if(debug){

1402

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

1403

" it, or wait\n");

1404

}

1405

/* the current time */

1406

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1407

if(ret == -1){

1408

perror_plus("clock_gettime");

1409

return -1;

1410

}

1411

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

1412

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

1413

waited_time.tv_sec = (now.tv_sec

1414

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

1415

waited_time.tv_nsec = (now.tv_nsec

1416

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

1417

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

1418

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

1419

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

1420

block_time = ((retry_interval

1421

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

1422

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

1423

1424

if(debug){

1425

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

1426

block_time);

1427

}

1428

1429

if(block_time <= 0){

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1434

if(ret == 0){

1435

avahi_simple_poll_quit(s);

1436

return 0;

1437

}

1438

ret = clock_gettime(CLOCK_MONOTONIC,

1439

&mc->current_server->last_seen);

1440

if(ret == -1){

1441

perror_plus("clock_gettime");

1442

return -1;

1443

}

1444

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

1445

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

1446

servers, but don't block */

1447

}

1448

1449

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

1450

}

1451

if(ret != 0){

1452

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

1453

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

1454

}

1455

}

1456

}

1457

}

1458

1459

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

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

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

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

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

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

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

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

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

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

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

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1515

__attribute__((nonnull))

1516

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

1517

const float delay){

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1521

if(numhooks == -1){

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

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

1534

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

1535

direntry = direntries[i];

1536

char *fullname = NULL;

1537

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

1538

if(ret < 0){

1539

perror_plus("asprintf");

1540

continue;

1541

}

1542

if(debug){

1543

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

1544

direntry->d_name);

1545

}

1546

pid_t hook_pid = fork();

1547

if(hook_pid == 0){

1548

/* Child */

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1583

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

1584

if(ret == -1){

1585

perror_plus("setenv");

1586

_exit(EX_OSERR);

1587

}

1588

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

1589

if(ret == -1){

1590

perror_plus("setenv");

1591

_exit(EX_OSERR);

1592

}

1593

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

1594

if(ret == -1){

1595

perror_plus("setenv");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

char *delaystring;

1604

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

1605

if(ret == -1){

1606

perror_plus("asprintf");

1607

_exit(EX_OSERR);

1608

}

1609

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

1610

if(ret == -1){

1611

free(delaystring);

1612

perror_plus("setenv");

1613

_exit(EX_OSERR);

1614

}

1615

free(delaystring);

1616

if(connect_to != NULL){

1617

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

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

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

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

1627

} else {

1628

int status;

1629

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

1630

perror_plus("waitpid");

1631

free(fullname);

1632

continue;

1633

}

1634

if(WIFEXITED(status)){

1635

if(WEXITSTATUS(status) != 0){

1636

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

1637

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

1638

WEXITSTATUS(status));

1639

free(fullname);

1640

continue;

1641

}

1642

} else if(WIFSIGNALED(status)){

1643

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

1644

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

1645

WTERMSIG(status));

1646

free(fullname);

1647

continue;

1648

} else {

1649

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

1650

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

1651

free(fullname);

1652

continue;

1653

}

1654

}

1655

free(fullname);

1656

if(debug){

1657

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

1658

direntry->d_name);

1659

}

1660

}

1661

close(devnull);

1662

}

1663

}

1664

1665

__attribute__((nonnull, warn_unused_result))

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

1669

int ret;

1670

struct ifreq network;

1671

unsigned int if_index = if_nametoindex(interface);

1672

if(if_index == 0){

1673

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

1674

errno = old_errno;

1675

return ENXIO;

1676

}

1677

1678

if(quit_now){

1679

errno = old_errno;

1680

return EINTR;

1681

}

1682

1683

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1686

ret_errno = errno;

1687

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

1688

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

1689

errno = old_errno;

1690

return ret_errno;

1691

}

1692

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

1693

1694

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

1695

if(sd == -1){

1696

ret_errno = errno;

1697

perror_plus("socket");

1698

errno = old_errno;

1699

return ret_errno;

1700

}

1701

1702

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1707

errno = old_errno;

1708

return EINTR;

1709

}

1710

1711

if(debug){

1712

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

1713

interface);

1714

}

1715

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

if(ret_errno != 0){

1719

perror_plus("Failed to raise privileges");

1720

}

1721

1722

#ifdef __linux__

1723

int ret_linux;

1724

bool restore_loglevel = false;

1725

if(ret_errno == 0){

1726

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1727

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

1728

ret_linux = klogctl(8, NULL, 5);

1729

if(ret_linux == -1){

1730

perror_plus("klogctl");

1731

} else {

1732

restore_loglevel = true;

1733

}

1734

}

1735

#endif /* __linux__ */

1736

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

1737

ioctl_errno = errno;

1738

#ifdef __linux__

1739

if(restore_loglevel){

1740

ret_linux = klogctl(7, NULL, 0);

1741

if(ret_linux == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

1747

/* If raise_privileges() succeeded above */

1748

if(ret_errno == 0){

1749

/* Lower privileges */

1750

ret_errno = lower_privileges();

1751

if(ret_errno != 0){

1752

errno = ret_errno;

1753

perror_plus("Failed to lower privileges");

1754

}

1755

}

1756

1757

/* Close the socket */

1758

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

1759

if(ret == -1){

1760

perror_plus("close");

1761

}

1762

1763

if(ret_setflags == -1){

1764

errno = ioctl_errno;

1765

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1766

errno = old_errno;

1767

return ioctl_errno;

1768

}

1769

} else if(debug){

1770

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

1771

interface);

1772

}

1773

1774

/* Sleep checking until interface is running.

1775

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

1776

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

1777

if(interface_is_running(interface)){

1778

break;

1779

}

1780

struct timespec sleeptime = { .tv_nsec = 250000000 };

1781

ret = nanosleep(&sleeptime, NULL);

1782

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

1783

perror_plus("nanosleep");

1784

}

1785

}

1786

1787

errno = old_errno;

1788

return 0;

1789

}

1790

1791

__attribute__((nonnull, warn_unused_result))

1792

error_t take_down_interface(const char *const interface){

1793

error_t old_errno = errno;

1794

struct ifreq network;

1795

unsigned int if_index = if_nametoindex(interface);

1796

if(if_index == 0){

1797

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

1798

errno = old_errno;

1799

return ENXIO;

1800

}

1801

if(interface_is_up(interface)){

1802

error_t ret_errno = 0, ioctl_errno = 0;

1803

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

1804

ret_errno = errno;

1805

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

1806

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

1807

errno = old_errno;

1808

return ret_errno;

1809

}

1810

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

1811

1812

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

1813

if(sd == -1){

1814

ret_errno = errno;

1815

perror_plus("socket");

1816

errno = old_errno;

1817

return ret_errno;

1818

}

1819

1820

if(debug){

1821

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

1822

interface);

1823

}

1824

1825

/* Raise privileges */

1826

ret_errno = raise_privileges();

1827

if(ret_errno != 0){

1828

perror_plus("Failed to raise privileges");

1829

}

1830

1831

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

1832

ioctl_errno = errno;

1833

1834

/* If raise_privileges() succeeded above */

1835

if(ret_errno == 0){

1836

/* Lower privileges */

1837

ret_errno = lower_privileges();

1838

if(ret_errno != 0){

1839

errno = ret_errno;

1840

perror_plus("Failed to lower privileges");

1841

}

1842

}

1843

1844

/* Close the socket */

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1849

1850

if(ret_setflags == -1){

1851

errno = ioctl_errno;

1852

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1853

errno = old_errno;

1854

return ioctl_errno;

1855

}

1856

} else if(debug){

1857

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

1858

interface);

1859

}

1860

1861

errno = old_errno;

1862

return 0;

1021

1863

}

1022

1864

1023

1865

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

1866

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

1867

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

1868

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

1869

.interfaces = NULL, .interfaces_size = 0 };

1024

1870

AvahiSServiceBrowser *sb = NULL;

1025

int error;

1871

error_t ret_errno;

1026

1872

int ret;

1027

1873

intmax_t tmpmax;

1028

1874

char *tmp;

1029

1875

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

1876

char *interfaces_to_take_down = NULL;

1877

size_t interfaces_to_take_down_size = 0;

1878

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

1879

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

1880

char *tempdir = NULL;

1039

1881

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

1882

const char *seckey = PATHDIR "/" SECKEY;

1041

1883

const char *pubkey = PATHDIR "/" PUBKEY;

1884

char *interfaces_hooks = NULL;

1042

1885

1043

1886

bool gnutls_initialized = false;

1044

1887

bool gpgme_initialized = false;

1045

1888

float delay = 2.5f;

1889

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

1890

retrying the same server again */

1046

1891

1047

1892

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1893

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1899

errno = 0;

1055

1900

ret = setgid(gid);

1056

1901

if(ret == -1){

1057

perror("setgid");

1902

perror_plus("setgid");

1058

1903

}

1059

1904

1060

1905

/* Lower user privileges (temporarily) */

1061

1906

errno = 0;

1062

1907

ret = seteuid(uid);

1063

1908

if(ret == -1){

1064

perror("seteuid");

1909

perror_plus("seteuid");

1065

1910

}

1066

1911

1067

1912

if(quit_now){

1102

1947

.arg = "SECONDS",

1103

1948

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

1104

1949

.group = 2 },

1950

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

1951

.arg = "SECONDS",

1952

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

1953

.group = 2 },

1954

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

1955

.arg = "DIR",

1956

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

1957

.group = 2 },

1105

1958

/*

1106

1959

* These reproduce what we would get without ARGP_NO_HELP

1107

1960

*/

1125

1978

connect_to = arg;

1126

1979

break;

1127

1980

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

1128

interface = arg;

1981

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

1982

arg, (int)',');

1983

if(ret_errno != 0){

1984

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

1985

}

1129

1986

break;

1130

1987

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

1131

1988

seckey = arg;

1151

2008

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

1152

2009

argp_error(state, "Bad delay");

1153

2010

}

2011

case 132: /* --retry */

2012

errno = 0;

2013

retry_interval = strtod(arg, &tmp);

2014

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

2015

or (retry_interval * 1000) > INT_MAX

2016

or retry_interval < 0){

2017

argp_error(state, "Bad retry interval");

2018

}

2019

break;

2020

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

2021

hookdir = arg;

1154

2022

break;

1155

2023

/*

1156

2024

* These reproduce what we would get without ARGP_NO_HELP

1163

2031

argp_state_help(state, state->out_stream,

1164

2032

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2033

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

1166

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

2034

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

1167

2035

exit(argp_err_exit_status);

1168

2036

break;

1169

2037

default:

1184

2052

case ENOMEM:

1185

2053

default:

1186

2054

errno = ret;

1187

perror("argp_parse");

2055

perror_plus("argp_parse");

1188

2056

exitcode = EX_OSERR;

1189

2057

goto end;

1190

2058

case EINVAL:

1192

2060

goto end;

1193

2061

}

1194

2062

}

2063

2064

{

2065

/* Work around Debian bug #633582:

2066

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

2067

2068

/* Re-raise privileges */

2069

ret_errno = raise_privileges();

2070

if(ret_errno != 0){

2071

errno = ret_errno;

2072

perror_plus("Failed to raise privileges");

2073

} else {

2074

struct stat st;

2075

2076

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

2077

int seckey_fd = open(seckey, O_RDONLY);

2078

if(seckey_fd == -1){

2079

perror_plus("open");

2080

} else {

2081

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

2082

if(ret == -1){

2083

perror_plus("fstat");

2084

} else {

2085

if(S_ISREG(st.st_mode)

2086

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

2087

ret = fchown(seckey_fd, uid, gid);

2088

if(ret == -1){

2089

perror_plus("fchown");

2090

}

2091

}

2092

}

2093

TEMP_FAILURE_RETRY(close(seckey_fd));

2094

}

2095

}

2096

2097

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

2098

int pubkey_fd = open(pubkey, O_RDONLY);

2099

if(pubkey_fd == -1){

2100

perror_plus("open");

2101

} else {

2102

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

2103

if(ret == -1){

2104

perror_plus("fstat");

2105

} else {

2106

if(S_ISREG(st.st_mode)

2107

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

2108

ret = fchown(pubkey_fd, uid, gid);

2109

if(ret == -1){

2110

perror_plus("fchown");

2111

}

2112

}

2113

}

2114

TEMP_FAILURE_RETRY(close(pubkey_fd));

2115

}

2116

}

2117

2118

/* Lower privileges */

2119

ret_errno = lower_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to lower privileges");

2123

}

2124

}

2125

}

2126

2127

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

2128

{

2129

char *interface = NULL;

2130

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

2131

interface))){

2132

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

2133

and if_nametoindex(interface) == 0){

2134

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

2135

fprintf_plus(stderr, "Not using nonexisting interface"

2136

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

2137

}

2138

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

2139

interface = NULL;

2140

}

2141

}

2142

}

2143

2144

/* Run network hooks */

2145

{

2146

if(mc.interfaces != NULL){

2147

interfaces_hooks = malloc(mc.interfaces_size);

2148

if(interfaces_hooks == NULL){

2149

perror_plus("malloc");

2150

goto end;

2151

}

2152

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

2153

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

2154

}

2155

run_network_hooks("start", interfaces_hooks != NULL ?

2156

interfaces_hooks : "", delay);

2157

}

1195

2158

1196

2159

if(not debug){

1197

2160

avahi_set_log_function(empty_log);

1201

2164

from the signal handler */

1202

2165

/* Initialize the pseudo-RNG for Avahi */

1203

2166

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2167

simple_poll = avahi_simple_poll_new();

2168

if(simple_poll == NULL){

2169

fprintf_plus(stderr,

2170

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

1207

2171

exitcode = EX_UNAVAILABLE;

1208

2172

goto end;

1209

2173

}

1211

2175

sigemptyset(&sigterm_action.sa_mask);

1212

2176

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

1213

2177

if(ret == -1){

1214

perror("sigaddset");

2178

perror_plus("sigaddset");

1215

2179

exitcode = EX_OSERR;

1216

2180

goto end;

1217

2181

}

1218

2182

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

1219

2183

if(ret == -1){

1220

perror("sigaddset");

2184

perror_plus("sigaddset");

1221

2185

exitcode = EX_OSERR;

1222

2186

goto end;

1223

2187

}

1224

2188

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

1225

2189

if(ret == -1){

1226

perror("sigaddset");

2190

perror_plus("sigaddset");

1227

2191

exitcode = EX_OSERR;

1228

2192

goto end;

1229

2193

}

1233

2197

*/

1234

2198

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

1235

2199

if(ret == -1){

1236

perror("sigaction");

2200

perror_plus("sigaction");

1237

2201

return EX_OSERR;

1238

2202

}

1239

2203

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2204

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

1241

2205

if(ret == -1){

1242

perror("sigaction");

2206

perror_plus("sigaction");

1243

2207

exitcode = EX_OSERR;

1244

2208

goto end;

1245

2209

}

1246

2210

}

1247

2211

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

1248

2212

if(ret == -1){

1249

perror("sigaction");

2213

perror_plus("sigaction");

1250

2214

return EX_OSERR;

1251

2215

}

1252

2216

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2217

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

1254

2218

if(ret == -1){

1255

perror("sigaction");

2219

perror_plus("sigaction");

1256

2220

exitcode = EX_OSERR;

1257

2221

goto end;

1258

2222

}

1259

2223

}

1260

2224

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

1261

2225

if(ret == -1){

1262

perror("sigaction");

2226

perror_plus("sigaction");

1263

2227

return EX_OSERR;

1264

2228

}

1265

2229

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2230

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

1267

2231

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1273

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

2232

perror_plus("sigaction");

2233

exitcode = EX_OSERR;

2234

goto end;

2235

}

2236

}

2237

2238

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

2239

if(mc.interfaces == NULL){

2240

struct dirent **direntries;

2241

/* Look for any good interfaces */

2242

ret = scandir(sys_class_net, &direntries, good_interface,

2243

alphasort);

2244

if(ret >= 1){

2245

/* Add all found interfaces to interfaces list */

2246

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

2247

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

2248

direntries[i]->d_name);

2249

if(ret_errno != 0){

2250

errno = ret_errno;

2251

perror_plus("argz_add");

2252

continue;

2253

}

2254

if(debug){

2255

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

2256

direntries[i]->d_name);

2257

}

2258

}

2259

free(direntries);

2260

} else {

2261

free(direntries);

2262

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

2263

exitcode = EXIT_FAILURE;

2264

goto end;

2265

}

2266

}

2267

2268

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

2269

{

2270

char *interface = NULL;

2271

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

2272

interface))){

2273

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

2274

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

2275

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

2276

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

2277

interface);

2278

interface = NULL;

2279

while((interface = argz_next(mc.interfaces,

2280

mc.interfaces_size, interface))){

2281

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

2282

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

2283

interface);

2284

interface = NULL;

1359

2285

}

1360

2286

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

2287

break;

1378

2288

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2289

bool interface_was_up = interface_is_up(interface);

2290

errno = bring_up_interface(interface, delay);

2291

if(not interface_was_up){

2292

if(errno != 0){

2293

perror_plus("Failed to bring up interface");

2294

} else {

2295

errno = argz_add(&interfaces_to_take_down,

2296

&interfaces_to_take_down_size,

2297

interface);

2298

if(errno != 0){

2299

perror_plus("argz_add");

2300

}

2301

}

2302

}

2303

}

2304

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

2305

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

2306

}

2307

}

2308

2309

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

2310

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

2311

if(debug){

2312

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

2313

mc.interfaces);

2314

}

2315

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

1416

2316

}

1417

2317

1418

2318

if(quit_now){

1419

2319

goto end;

1420

2320

}

1421

2321

1422

ret = init_gnutls_global(pubkey, seckey);

2322

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

1423

2323

if(ret == -1){

1424

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

2324

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

1425

2325

exitcode = EX_UNAVAILABLE;

1426

2326

goto end;

1427

2327

} else {

1432

2332

goto end;

1433

2333

}

1434

2334

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2335

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

2336

tempdir = mkdtemp(run_tempdir);

2337

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

2338

if(debug){

2339

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

2340

run_tempdir, old_tempdir);

2341

}

2342

tempdir = mkdtemp(old_tempdir);

2343

}

2344

if(tempdir == NULL){

2345

perror_plus("mkdtemp");

1439

2346

goto end;

1440

2347

}

1441

2348

1443

2350

goto end;

1444

2351

}

1445

2352

1446

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

1447

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

2353

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

2354

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

1448

2355

exitcode = EX_UNAVAILABLE;

1449

2356

goto end;

1450

2357

} else {

1459

2366

/* Connect directly, do not use Zeroconf */

1460

2367

/* (Mainly meant for debugging) */

1461

2368

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

2369

1462

2370

if(address == NULL){

1463

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

2371

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

1464

2372

exitcode = EX_USAGE;

1465

2373

goto end;

1466

2374

}

1469

2377

goto end;

1470

2378

}

1471

2379

1472

uint16_t port;

2380

in_port_t port;

1473

2381

errno = 0;

1474

2382

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

1475

2383

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2384

or tmpmax != (in_port_t)tmpmax){

2385

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

1478

2386

exitcode = EX_USAGE;

1479

2387

goto end;

1480

2388

}

1481

2389

1482

2390

if(quit_now){

1483

2391

goto end;

1484

2392

}

1485

2393

1486

port = (uint16_t)tmpmax;

2394

port = (in_port_t)tmpmax;

1487

2395

*address = '\0';

1488

address = connect_to;

1489

2396

/* Colon in address indicates IPv6 */

1490

2397

int af;

1491

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

2398

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

1492

2399

af = AF_INET6;

2400

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

2401

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

2402

{

2403

connect_to++;

2404

address[-1] = '\0';

2405

}

1493

2406

} else {

1494

2407

af = AF_INET;

1495

2408

}

2409

address = connect_to;

1496

2410

1497

2411

if(quit_now){

1498

2412

goto end;

1499

2413

}

1500

2414

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2415

while(not quit_now){

2416

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

2417

&mc);

2418

if(quit_now or ret == 0){

2419

break;

2420

}

2421

if(debug){

2422

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

2423

(int)retry_interval);

2424

}

2425

sleep((unsigned int)retry_interval);

2426

}

2427

2428

if(not quit_now){

1523

2429

exitcode = EXIT_SUCCESS;

1524

2430

}

2431

1525

2432

goto end;

1526

2433

}

1527

2434

1539

2446

config.publish_domain = 0;

1540

2447

1541

2448

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2449

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2450

&config, NULL, NULL, &ret_errno);

1545

2451

1546

2452

/* Free the Avahi configuration data */

1547

2453

avahi_server_config_free(&config);

1549

2455

1550

2456

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

1551

2457

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2458

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

2459

avahi_strerror(ret_errno));

1554

2460

exitcode = EX_UNAVAILABLE;

1555

2461

goto end;

1556

2462

}

1562

2468

/* Create the Avahi service browser */

1563

2469

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2470

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2471

NULL, 0, browse_callback,

2472

(void *)&mc);

1566

2473

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2474

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

2475

avahi_strerror(avahi_server_errno(mc.server)));

1569

2476

exitcode = EX_UNAVAILABLE;

1570

2477

goto end;

1571

2478

}

1577

2484

/* Run the main loop */

1578

2485

1579

2486

if(debug){

1580

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

1581

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2487

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

2488

}

2489

2490

ret = avahi_loop_with_timeout(simple_poll,

2491

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

2492

if(debug){

2493

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

2494

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

2495

}

1584

2496

1585

2497

end:

1586

2498

1587

2499

if(debug){

1588

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

2500

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

1589

2501

}

1590

2502

1591

2503

/* Cleanup things */

2504

free(mc.interfaces);

2505

1592

2506

if(sb != NULL)

1593

2507

avahi_s_service_browser_free(sb);

1594

2508

1595

2509

if(mc.server != NULL)

1596

2510

avahi_server_free(mc.server);

1597

2511

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2512

if(simple_poll != NULL)

2513

avahi_simple_poll_free(simple_poll);

1600

2514

1601

2515

if(gnutls_initialized){

1602

2516

gnutls_certificate_free_credentials(mc.cred);

1608

2522

gpgme_release(mc.ctx);

1609

2523

}

1610

2524

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

2525

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

2526

has seen */

2527

if(mc.current_server != NULL){

2528

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

2529

while(mc.current_server != NULL){

2530

server *next = mc.current_server->next;

2531

free(mc.current_server);

2532

mc.current_server = next;

1640

2533

}

1641

2534

}

1642

2535

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

2536

/* Re-raise privileges */

2537

{

2538

ret_errno = raise_privileges();

2539

if(ret_errno != 0){

2540

perror_plus("Failed to raise privileges");

1652

2541

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

2542

2543

/* Run network hooks */

2544

run_network_hooks("stop", interfaces_hooks != NULL ?

2545

interfaces_hooks : "", delay);

2546

2547

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

2548

{

2549

char *interface = NULL;

2550

while((interface=argz_next(interfaces_to_take_down,

2551

interfaces_to_take_down_size,

2552

interface))){

2553

ret_errno = take_down_interface(interface);

2554

if(ret_errno != 0){

2555

errno = ret_errno;

2556

perror_plus("Failed to take down interface");

2557

}

2558

}

2559

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

2560

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

2561

" down\n");

2562

}

2563

}

2564

}

2565

2566

ret_errno = lower_privileges_permanently();

2567

if(ret_errno != 0){

2568

perror_plus("Failed to lower privileges permanently");

2569

}

2570

}

2571

2572

free(interfaces_to_take_down);

2573

free(interfaces_hooks);

2574

2575

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

2576

if(tempdir != NULL){

2577

struct dirent **direntries = NULL;

2578

struct dirent *direntry = NULL;

2579

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

2580

alphasort);

2581

if(numentries > 0){

2582

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

2583

direntry = direntries[i];

1665

2584

char *fullname = NULL;

1666

2585

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

1667

2586

direntry->d_name);

1668

2587

if(ret < 0){

1669

perror("asprintf");

2588

perror_plus("asprintf");

1670

2589

continue;

1671

2590

}

1672

2591

ret = remove(fullname);

1673

2592

if(ret == -1){

1674

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

1675

strerror(errno));

2593

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

2594

strerror(errno));

1676

2595

}

1677

2596

free(fullname);

1678

2597

}

1679

closedir(d);

2598

}

2599

2600

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

2601

free(direntries);

2602

if(numentries == -1){

2603

perror_plus("scandir");

1680

2604

}

1681

2605

ret = rmdir(tempdir);

1682

2606

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

1683

perror("rmdir");

2607

perror_plus("rmdir");

1684

2608

}

1685

2609

}

1686

2610

1691

2615

&old_sigterm_action,

1692

2616

NULL));

1693

2617

if(ret == -1){

1694

perror("sigaction");

2618

perror_plus("sigaction");

1695

2619

}

1696

2620

do {

1697

2621

ret = raise(signal_received);

1698

2622

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

1699

2623

if(ret != 0){

1700

perror("raise");

2624

perror_plus("raise");

1701

2625

abort();

1702

2626

}

1703

2627

TEMP_FAILURE_RETRY(pause());