/mandos/trunk : revision 237.4.92

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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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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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*

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* This file is part of Mandos.

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*

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* Mandos is free software: you can redistribute it and/or modify it

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* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* General Public License for more details.

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*

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* You should have received a copy of the GNU General Public License

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* along with this program. If not, see

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

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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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*

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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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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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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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stdout, ferror() */

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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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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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#include <string.h> /* strcmp(), strlen(), strerror(),

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asprintf(), strncpy(), strsignal()

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*/

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#include <sys/ioctl.h> /* ioctl */

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

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

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

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

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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*/

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

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strtoimax() */

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

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

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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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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*/

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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, inet_ntop() */

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setgid(), pause(), _exit(),

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unlinkat() */

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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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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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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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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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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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int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

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int af){

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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 -1;

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return false;

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}

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

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.port = port,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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free(new_server);

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return false;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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#ifdef __GNUC__

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#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wcast-qual"

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#endif

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free((char *)(new_server->ip));

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#ifdef __GNUC__

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#pragma GCC diagnostic pop

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#endif

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free(new_server);

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

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} else {

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new_server->next = mc.current_server;

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

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/* 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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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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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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*/

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

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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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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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"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, "Mandos plugin mandos-client: "

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"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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ret = close(fd);

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if(ret == -1){

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perror_plus("close");

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}

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}

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if(debug){

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

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"Initializing GPGME\n");

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

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

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

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

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tempdir);

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return false;

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}

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/* Create new GPGME "context" */

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

357

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

317

358

if(rc != GPG_ERR_NO_ERROR){

318

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

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

320

gpgme_strerror(rc));

359

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

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

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gpgme_strerror(rc));

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return false;

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}

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* Decrypt OpenPGP data.

333

374

* Returns -1 on error

334

375

*/

376

__attribute__((nonnull, warn_unused_result))

335

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

336

378

size_t crypto_size,

337

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

338

381

gpgme_data_t dh_crypto, dh_plain;

339

382

gpgme_error_t rc;

340

383

ssize_t ret;

342

385

ssize_t plaintext_length = 0;

343

386

344

387

if(debug){

345

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

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"Trying to decrypt OpenPGP data\n");

388

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

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389

}

348

390

349

391

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

350

392

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

393

0);

352

394

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

395

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

396

gpgme_strsource(rc), gpgme_strerror(rc));

356

397

return -1;

357

398

}

358

399

359

400

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

360

401

rc = gpgme_data_new(&dh_plain);

361

402

if(rc != GPG_ERR_NO_ERROR){

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

403

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

404

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

405

gpgme_strsource(rc), gpgme_strerror(rc));

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406

gpgme_data_release(dh_crypto);

366

407

return -1;

367

408

}

368

409

369

410

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

370

411

data buffer */

371

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

412

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

372

413

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

376

416

plaintext_length = -1;

377

417

if(debug){

378

418

gpgme_decrypt_result_t result;

379

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

380

420

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

421

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

383

422

} else {

384

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

385

"Unsupported algorithm: %s\n",

386

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

389

result->wrong_key_usage);

423

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

424

result->unsupported_algorithm);

425

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

426

result->wrong_key_usage);

390

427

if(result->file_name != NULL){

391

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

392

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

428

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

393

429

}

394

430

gpgme_recipient_t recipient;

395

431

recipient = result->recipients;

396

432

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

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

402

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

403

"Secret key available: %s\n",

404

recipient->status == GPG_ERR_NO_SECKEY

405

? "No" : "Yes");

433

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

434

gpgme_pubkey_algo_name

435

(recipient->pubkey_algo));

436

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

437

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

438

recipient->status == GPG_ERR_NO_SECKEY

439

? "No" : "Yes");

406

440

recipient = recipient->next;

407

441

}

408

442

}

411

445

}

412

446

413

447

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

448

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

416

449

}

417

450

418

451

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

449

482

}

450

483

451

484

if(debug){

452

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

453

"Decrypted password is: ");

485

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

454

486

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

455

487

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

456

488

}

467

499

return plaintext_length;

468

500

}

469

501

470

static const char * safer_gnutls_strerror(int value){

471

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

472

-Wunreachable-code */

473

if(ret == NULL)

474

ret = "(unknown)";

475

return ret;

502

__attribute__((warn_unused_result, const))

503

static const char *safe_string(const char *str){

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

509

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

511

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

476

513

}

477

514

478

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

479

517

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

480

518

const char* string){

481

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

519

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

482

520

}

483

521

522

__attribute__((nonnull(1, 2, 4), warn_unused_result))

484

523

static int init_gnutls_global(const char *pubkeyfilename,

485

const char *seckeyfilename){

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

486

527

int ret;

528

unsigned int uret;

487

529

488

530

if(debug){

489

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

490

"Initializing GnuTLS\n");

491

}

492

493

ret = gnutls_global_init();

494

if(ret != GNUTLS_E_SUCCESS){

495

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

496

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

497

return -1;

531

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

498

532

}

499

533

500

534

if(debug){

506

540

}

507

541

508

542

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

544

if(ret != GNUTLS_E_SUCCESS){

511

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

512

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

513

gnutls_global_deinit();

545

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

546

safer_gnutls_strerror(ret));

514

547

return -1;

515

548

}

516

549

517

550

if(debug){

518

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

519

"Attempting to use OpenPGP public key %s and"

520

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

521

seckeyfilename);

551

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

552

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

553

pubkeyfilename,

554

seckeyfilename);

522

555

}

523

556

524

557

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

558

(mc->cred, pubkeyfilename, seckeyfilename,

526

559

GNUTLS_OPENPGP_FMT_BASE64);

527

560

if(ret != GNUTLS_E_SUCCESS){

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

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

531

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

532

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

533

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

561

fprintf_plus(stderr,

562

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

563

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

564

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

565

safer_gnutls_strerror(ret));

534

566

goto globalfail;

535

567

}

536

568

537

569

/* GnuTLS server initialization */

538

ret = gnutls_dh_params_init(&mc.dh_params);

539

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

542

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

543

goto globalfail;

544

}

545

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

546

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

549

safer_gnutls_strerror(ret));

550

goto globalfail;

551

}

552

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

ret = gnutls_dh_params_init(&mc->dh_params);

571

if(ret != GNUTLS_E_SUCCESS){

572

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

573

" initialization: %s\n",

574

safer_gnutls_strerror(ret));

575

goto globalfail;

576

}

577

/* If a Diffie-Hellman parameters file was given, try to use it */

578

if(dhparamsfilename != NULL){

579

gnutls_datum_t params = { .data = NULL, .size = 0 };

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

588

while(true){

589

params_capacity = incbuffer((char **)&params.data,

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

fprintf_plus(stderr, "Failed to parse DH parameters in file"

626

" \"%s\": %s\n", dhparamsfilename,

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

/* Find out the optimal number of DH bits */

636

/* Try to read the private key file */

637

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

buffer_capacity = incbuffer((char **)&buffer.data,

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

/* If successful, use buffer to parse private key */

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

679

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

682

safer_gnutls_strerror(ret));

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

688

if(ret != GNUTLS_E_SUCCESS){

689

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

" a GnuTLS security parameter \"%s\".\n",

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

707

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

717

}

718

}

719

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

723

if(debug){

724

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

725

" implies %u DH bits; using that.\n",

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

729

}

730

} else {

731

fprintf_plus(stderr, "Failed to get implied number of DH"

732

" bits for security parameter \"%s\"): %s\n",

733

safe_string(gnutls_sec_param_get_name

734

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

737

}

738

} else if(debug){

739

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

740

mc->dh_bits);

741

}

742

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

743

if(ret != GNUTLS_E_SUCCESS){

744

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

745

" bits): %s\n", mc->dh_bits,

746

safer_gnutls_strerror(ret));

747

goto globalfail;

748

}

749

}

750

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

554

751

555

752

return 0;

556

753

557

754

globalfail:

558

755

559

gnutls_certificate_free_credentials(mc.cred);

560

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

756

gnutls_certificate_free_credentials(mc->cred);

757

gnutls_dh_params_deinit(mc->dh_params);

562

758

return -1;

563

759

}

564

760

565

static int init_gnutls_session(gnutls_session_t *session){

761

__attribute__((nonnull, warn_unused_result))

762

static int init_gnutls_session(gnutls_session_t *session,

763

mandos_context *mc){

566

764

int ret;

567

765

/* GnuTLS session creation */

568

766

do {

572

770

}

573

771

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

574

772

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

577

safer_gnutls_strerror(ret));

773

fprintf_plus(stderr,

774

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

775

safer_gnutls_strerror(ret));

578

776

}

579

777

580

778

{

581

779

const char *err;

582

780

do {

583

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

781

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

584

782

if(quit_now){

585

783

gnutls_deinit(*session);

586

784

return -1;

587

785

}

588

786

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

589

787

if(ret != GNUTLS_E_SUCCESS){

590

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

591

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

592

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

593

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

788

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

789

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

790

safer_gnutls_strerror(ret));

594

791

gnutls_deinit(*session);

595

792

return -1;

596

793

}

598

795

599

796

do {

600

797

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

601

mc.cred);

798

mc->cred);

602

799

if(quit_now){

603

800

gnutls_deinit(*session);

604

801

return -1;

605

802

}

606

803

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

607

804

if(ret != GNUTLS_E_SUCCESS){

608

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

609

"Error setting GnuTLS credentials: %s\n",

610

safer_gnutls_strerror(ret));

805

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

806

safer_gnutls_strerror(ret));

611

807

gnutls_deinit(*session);

612

808

return -1;

613

809

}

615

811

/* ignore client certificate if any. */

616

812

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

617

813

618

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

619

620

814

return 0;

621

815

}

622

816

624

818

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

625

819

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

626

820

821

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

822

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

826

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

827

ret = errno;

828

}

829

errno = old_errno;

830

return ret;

831

}

832

833

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

834

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

839

errno = old_errno;

840

return ret;

841

}

842

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

843

ret = errno;

844

}

845

errno = old_errno;

846

return ret;

847

}

848

849

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

850

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

854

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

855

ret = errno;

856

}

857

errno = old_errno;

858

return ret;

859

}

860

861

/* Lower privileges permanently */

862

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

866

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

867

ret = errno;

868

}

869

errno = old_errno;

870

return ret;

871

}

872

873

/* Helper function to add_local_route() and delete_local_route() */

874

__attribute__((nonnull, warn_unused_result))

875

static bool add_delete_local_route(const bool add,

876

const char *address,

877

AvahiIfIndex if_index){

878

int ret;

879

char helper[] = "mandos-client-iprouteadddel";

880

char add_arg[] = "add";

881

char delete_arg[] = "delete";

882

char debug_flag[] = "--debug";

883

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

884

if(pluginhelperdir == NULL){

885

if(debug){

886

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

887

" variable not set; cannot run helper\n");

888

}

889

return false;

890

}

891

892

char interface[IF_NAMESIZE];

893

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

894

perror_plus("if_indextoname");

895

return false;

896

}

897

898

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

899

if(devnull == -1){

900

perror_plus("open(\"/dev/null\", O_RDONLY)");

901

return false;

902

}

903

pid_t pid = fork();

904

if(pid == 0){

905

/* Child */

906

/* Raise privileges */

907

errno = raise_privileges_permanently();

908

if(errno != 0){

909

perror_plus("Failed to raise privileges");

910

/* _exit(EX_NOPERM); */

911

} else {

912

/* Set group */

913

errno = 0;

914

ret = setgid(0);

915

if(ret == -1){

916

perror_plus("setgid");

917

_exit(EX_NOPERM);

918

}

919

/* Reset supplementary groups */

920

errno = 0;

921

ret = setgroups(0, NULL);

922

if(ret == -1){

923

perror_plus("setgroups");

924

_exit(EX_NOPERM);

925

}

926

}

927

ret = dup2(devnull, STDIN_FILENO);

928

if(ret == -1){

929

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

930

_exit(EX_OSERR);

931

}

932

ret = close(devnull);

933

if(ret == -1){

934

perror_plus("close");

935

_exit(EX_OSERR);

936

}

937

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

938

if(ret == -1){

939

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

940

_exit(EX_OSERR);

941

}

942

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

943

O_RDONLY

944

| O_DIRECTORY

945

| O_PATH

946

| O_CLOEXEC));

947

if(helperdir_fd == -1){

948

perror_plus("open");

949

_exit(EX_UNAVAILABLE);

950

}

951

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

952

helper, O_RDONLY));

953

if(helper_fd == -1){

954

perror_plus("openat");

955

close(helperdir_fd);

956

_exit(EX_UNAVAILABLE);

957

}

958

close(helperdir_fd);

959

#ifdef __GNUC__

960

#pragma GCC diagnostic push

961

#pragma GCC diagnostic ignored "-Wcast-qual"

962

#endif

963

if(fexecve(helper_fd, (char *const [])

964

{ helper, add ? add_arg : delete_arg, (char *)address,

965

interface, debug ? debug_flag : NULL, NULL },

966

environ) == -1){

967

#ifdef __GNUC__

968

#pragma GCC diagnostic pop

969

#endif

970

perror_plus("fexecve");

971

_exit(EXIT_FAILURE);

972

}

973

}

974

if(pid == -1){

975

perror_plus("fork");

976

return false;

977

}

978

int status;

979

pid_t pret = -1;

980

errno = 0;

981

do {

982

pret = waitpid(pid, &status, 0);

983

if(pret == -1 and errno == EINTR and quit_now){

984

int errno_raising = 0;

985

if((errno = raise_privileges()) != 0){

986

errno_raising = errno;

987

perror_plus("Failed to raise privileges in order to"

988

" kill helper program");

989

}

990

if(kill(pid, SIGTERM) == -1){

991

perror_plus("kill");

992

}

993

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

994

perror_plus("Failed to lower privileges after killing"

995

" helper program");

996

}

997

return false;

998

}

999

} while(pret == -1 and errno == EINTR);

1000

if(pret == -1){

1001

perror_plus("waitpid");

1002

return false;

1003

}

1004

if(WIFEXITED(status)){

1005

if(WEXITSTATUS(status) != 0){

1006

fprintf_plus(stderr, "Error: iprouteadddel exited"

1007

" with status %d\n", WEXITSTATUS(status));

1008

return false;

1009

}

1010

return true;

1011

}

1012

if(WIFSIGNALED(status)){

1013

fprintf_plus(stderr, "Error: iprouteadddel died by"

1014

" signal %d\n", WTERMSIG(status));

1015

return false;

1016

}

1017

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1018

return false;

1019

}

1020

1021

__attribute__((nonnull, warn_unused_result))

1022

static bool add_local_route(const char *address,

1023

AvahiIfIndex if_index){

1024

if(debug){

1025

fprintf_plus(stderr, "Adding route to %s\n", address);

1026

}

1027

return add_delete_local_route(true, address, if_index);

1028

}

1029

1030

__attribute__((nonnull, warn_unused_result))

1031

static bool delete_local_route(const char *address,

1032

AvahiIfIndex if_index){

1033

if(debug){

1034

fprintf_plus(stderr, "Removing route to %s\n", address);

1035

}

1036

return add_delete_local_route(false, address, if_index);

1037

}

1038

627

1039

/* Called when a Mandos server is found */

628

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

1040

__attribute__((nonnull, warn_unused_result))

1041

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

629

1042

AvahiIfIndex if_index,

630

int af){

1043

int af, mandos_context *mc){

631

1044

int ret, tcp_sd = -1;

632

1045

ssize_t sret;

633

union {

634

struct sockaddr_in in;

635

struct sockaddr_in6 in6;

636

} to;

1046

struct sockaddr_storage to;

637

1047

char *buffer = NULL;

638

1048

char *decrypted_buffer = NULL;

639

1049

size_t buffer_length = 0;

642

1052

int retval = -1;

643

1053

gnutls_session_t session;

644

1054

int pf; /* Protocol family */

1055

bool route_added = false;

645

1056

646

1057

errno = 0;

647

1058

658

1069

pf = PF_INET;

659

1070

break;

660

1071

default:

661

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

662

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

1072

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

663

1073

errno = EINVAL;

664

1074

return -1;

665

1075

}

666

1076

667

ret = init_gnutls_session(&session);

1077

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

1078

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

1079

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

1080

bool match = false;

1081

{

1082

char *interface = NULL;

1083

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

1084

mc->interfaces_size,

1085

interface))){

1086

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

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

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

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

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

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

668

1111

if(ret != 0){

669

1112

return -1;

670

1113

}

671

1114

672

1115

if(debug){

673

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

674

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

675

"\n", ip, port);

1116

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

1117

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

676

1118

}

677

1119

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

679

1121

if(tcp_sd < 0){

680

1122

int e = errno;

681

1123

perror_plus("socket");

688

1130

goto mandos_end;

689

1131

}

690

1132

691

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

692

1133

if(af == AF_INET6){

693

to.in6.sin6_family = (sa_family_t)af;

694

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

1134

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1135

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1136

ret = inet_pton(af, ip, &to6->sin6_addr);

695

1137

} else { /* IPv4 */

696

to.in.sin_family = (sa_family_t)af;

697

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

1138

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1139

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1140

ret = inet_pton(af, ip, &to4->sin_addr);

698

1141

}

699

1142

if(ret < 0 ){

700

1143

int e = errno;

704

1147

}

705

1148

if(ret == 0){

706

1149

int e = errno;

707

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

708

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

1150

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

709

1151

errno = e;

710

1152

goto mandos_end;

711

1153

}

712

1154

if(af == AF_INET6){

713

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

714

-Wconversion and

715

-Wunreachable-code */

716

717

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

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

719

-Wunreachable-code*/

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

720

1158

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

1159

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

1160

" incomplete without a network interface\n");

724

1161

errno = EINVAL;

725

1162

goto mandos_end;

726

1163

}

727

1164

/* Set the network interface number as scope */

728

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

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

729

1166

}

730

1167

} else {

731

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

732

-Wconversion and

733

-Wunreachable-code */

1168

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

734

1169

}

735

1170

736

1171

if(quit_now){

744

1179

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

745

1180

perror_plus("if_indextoname");

746

1181

} else {

747

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

748

"Connection to: %s%%%s, port %" PRIu16 "\n",

749

ip, interface, port);

1182

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

1183

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

750

1184

}

751

1185

} else {

752

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

753

"Connection to: %s, port %" PRIu16 "\n", ip, port);

1186

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

1187

ip, (uintmax_t)port);

754

1188

}

755

1189

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

1190

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

757

const char *pcret;

758

if(af == AF_INET6){

759

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

760

sizeof(addrstr));

761

} else {

762

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

763

sizeof(addrstr));

764

}

765

if(pcret == NULL){

766

perror_plus("inet_ntop");

767

} else {

768

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

769

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

770

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

771

}

772

}

773

}

774

775

if(quit_now){

776

errno = EINTR;

777

goto mandos_end;

778

}

779

780

if(af == AF_INET6){

781

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

782

} else {

783

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

784

}

785

if(ret < 0){

786

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

787

int e = errno;

788

perror_plus("connect");

789

errno = e;

790

}

791

goto mandos_end;

792

}

793

794

if(quit_now){

795

errno = EINTR;

796

goto mandos_end;

1191

if(af == AF_INET6){

1192

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

1193

sizeof(struct sockaddr_in6),

1194

addrstr, sizeof(addrstr), NULL, 0,

1195

NI_NUMERICHOST);

1196

} else {

1197

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

1198

sizeof(struct sockaddr_in),

1199

addrstr, sizeof(addrstr), NULL, 0,

1200

NI_NUMERICHOST);

1201

}

1202

if(ret == EAI_SYSTEM){

1203

perror_plus("getnameinfo");

1204

} else if(ret != 0) {

1205

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

1206

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

1207

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

1208

}

1209

}

1210

1211

if(quit_now){

1212

errno = EINTR;

1213

goto mandos_end;

1214

}

1215

1216

while(true){

1217

if(af == AF_INET6){

1218

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

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

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

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1235

& 0xFFFF0000L) != 0xA9FE0000L))){

1236

/* Work around Avahi bug - Avahi does not announce link-local

1237

addresses if it has a global address, so local hosts with

1238

*only* a link-local address (e.g. Mandos clients) cannot

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

with an explicit route added with the server's address.

1242

1243

Avahi bug reference:

1244

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

797

1271

}

798

1272

799

1273

const char *out = mandos_protocol_version;

827

1301

}

828

1302

829

1303

if(debug){

830

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

831

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

1304

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

832

1305

}

833

1306

834

1307

if(quit_now){

836

1309

goto mandos_end;

837

1310

}

838

1311

839

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

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1312

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

1313

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

1314

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

1315

gnutls_transport_set_ptr(session,

1316

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

841

1317

842

1318

if(quit_now){

843

1319

errno = EINTR;

854

1330

855

1331

if(ret != GNUTLS_E_SUCCESS){

856

1332

if(debug){

857

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

858

"*** GnuTLS Handshake failed ***\n");

1333

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

859

1334

gnutls_perror(ret);

860

1335

}

861

1336

errno = EPROTO;

865

1340

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

866

1341

867

1342

if(debug){

868

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

869

"Retrieving OpenPGP encrypted password from %s\n", ip);

1343

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1344

" %s\n", ip);

870

1345

}

871

1346

872

1347

while(true){

910

1385

}

911

1386

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

912

1387

if(ret < 0){

913

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

914

"*** GnuTLS Re-handshake failed ***\n");

1388

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

1389

"***\n");

915

1390

gnutls_perror(ret);

916

1391

errno = EPROTO;

917

1392

goto mandos_end;

918

1393

}

919

1394

break;

920

1395

default:

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

1396

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

1397

" encrypted session with Mandos server\n");

924

1398

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

1399

errno = EIO;

926

1400

goto mandos_end;

931

1405

}

932

1406

933

1407

if(debug){

934

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

935

"Closing TLS session\n");

1408

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

936

1409

}

937

1410

938

1411

if(quit_now){

951

1424

if(buffer_length > 0){

952

1425

ssize_t decrypted_buffer_size;

953

1426

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

954

&decrypted_buffer);

1427

&decrypted_buffer, mc);

955

1428

if(decrypted_buffer_size >= 0){

956

1429

1430

clearerr(stdout);

957

1431

written = 0;

958

1432

while(written < (size_t) decrypted_buffer_size){

959

1433

if(quit_now){

967

1441

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

968

1442

int e = errno;

969

1443

if(debug){

970

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

971

"Error writing encrypted data: %s\n",

972

strerror(errno));

1444

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

1445

strerror(errno));

973

1446

}

974

1447

errno = e;

975

1448

goto mandos_end;

976

1449

}

977

1450

written += (size_t)ret;

978

1451

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

979

1462

retval = 0;

980

1463

}

981

1464

}

984

1467

985

1468

mandos_end:

986

1469

{

1470

if(route_added){

1471

if(not delete_local_route(ip, if_index)){

1472

fprintf_plus(stderr, "Failed to delete local route to %s on"

1473

" interface %d", ip, if_index);

1474

}

1475

}

987

1476

int e = errno;

988

1477

free(decrypted_buffer);

989

1478

free(buffer);

990

1479

if(tcp_sd >= 0){

991

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

1480

ret = close(tcp_sd);

992

1481

}

993

1482

if(ret == -1){

994

1483

if(e == 0){

1019

1508

AVAHI_GCC_UNUSED AvahiStringList *txt,

1020

1509

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1021

1510

flags,

1022

AVAHI_GCC_UNUSED void* userdata){

1023

assert(r);

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

1024

1515

1025

1516

/* Called whenever a service has been resolved successfully or

1026

1517

timed out */

1027

1518

1028

1519

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1029

1521

return;

1030

1522

}

1031

1523

1032

1524

switch(event){

1033

1525

default:

1034

1526

case AVAHI_RESOLVER_FAILURE:

1035

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

1036

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

1037

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

1038

avahi_strerror(avahi_server_errno(mc.server)));

1527

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

1528

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

1529

domain,

1530

avahi_strerror(avahi_server_errno

1531

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

1039

1532

break;

1040

1533

1041

1534

case AVAHI_RESOLVER_FOUND:

1043

1536

char ip[AVAHI_ADDRESS_STR_MAX];

1044

1537

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

1045

1538

if(debug){

1046

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

1047

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

1048

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

1049

ip, (intmax_t)interface, port);

1539

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

1540

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

1541

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

1050

1542

}

1051

int ret = start_mandos_communication(ip, port, interface,

1052

avahi_proto_to_af(proto));

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

1053

1547

if(ret == 0){

1054

avahi_simple_poll_quit(mc.simple_poll);

1548

avahi_simple_poll_quit(simple_poll);

1055

1549

} else {

1056

ret = add_server(ip, port, interface,

1057

avahi_proto_to_af(proto));

1550

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

1551

avahi_proto_to_af(proto),

1552

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

1553

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

1554

" list\n", name);

1555

}

1058

1556

}

1059

1557

}

1060

1558

}

1070

1568

const char *domain,

1071

1569

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1072

1570

flags,

1073

AVAHI_GCC_UNUSED void* userdata){

1074

assert(b);

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

1075

1575

1076

1576

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

1077

1577

is removed from the LAN */

1084

1584

default:

1085

1585

case AVAHI_BROWSER_FAILURE:

1086

1586

1087

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

1088

"(Avahi browser) %s\n",

1089

avahi_strerror(avahi_server_errno(mc.server)));

1090

avahi_simple_poll_quit(mc.simple_poll);

1587

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

1588

avahi_strerror(avahi_server_errno

1589

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

1590

avahi_simple_poll_quit(simple_poll);

1091

1591

return;

1092

1592

1093

1593

case AVAHI_BROWSER_NEW:

1096

1596

the callback function is called the Avahi server will free the

1097

1597

resolver for us. */

1098

1598

1099

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

1100

name, type, domain, protocol, 0,

1101

resolve_callback, NULL) == NULL)

1102

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

1103

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

1104

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

1599

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

1600

interface, protocol, name, type,

1601

domain, protocol, 0,

1602

resolve_callback, mc) == NULL)

1603

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

1604

" %s\n", name,

1605

avahi_strerror(avahi_server_errno

1606

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

1105

1607

break;

1106

1608

1107

1609

case AVAHI_BROWSER_REMOVE:

1110

1612

case AVAHI_BROWSER_ALL_FOR_NOW:

1111

1613

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1112

1614

if(debug){

1113

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

1114

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

1615

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

1616

" searching...\n");

1115

1617

}

1116

1618

break;

1117

1619

}

1126

1628

signal_received = sig;

1127

1629

int old_errno = errno;

1128

1630

/* set main loop to exit */

1129

if(mc.simple_poll != NULL){

1130

avahi_simple_poll_quit(mc.simple_poll);

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1131

1633

}

1132

1634

errno = old_errno;

1133

1635

}

1134

1636

1637

__attribute__((nonnull, warn_unused_result))

1135

1638

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

1136

1639

int ret;

1640

int old_errno;

1137

1641

1138

1642

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

1139

1643

if(s < 0){

1644

old_errno = errno;

1140

1645

perror_plus("socket");

1646

errno = old_errno;

1141

1647

return false;

1142

1648

}

1143

strcpy(ifr->ifr_name, ifname);

1649

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1650

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1144

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

1652

if(ret == -1){

1146

1653

if(debug){

1654

old_errno = errno;

1147

1655

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1148

1657

}

1149

1658

return false;

1150

1659

}

1151

1660

return true;

1152

1661

}

1153

1662

1663

__attribute__((nonnull, warn_unused_result))

1154

1664

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

1155

1665

1156

1666

/* Reject the loopback device */

1157

1667

if(ifr->ifr_flags & IFF_LOOPBACK){

1158

1668

if(debug){

1159

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

1160

"Rejecting loopback interface \"%s\"\n", ifname);

1669

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

1670

ifname);

1161

1671

}

1162

1672

return false;

1163

1673

}

1164

1674

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

1165

1675

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

1166

1676

if(debug){

1167

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

1168

"Accepting point-to-point interface \"%s\"\n", ifname);

1677

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

1678

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

1169

1679

}

1170

1680

return true;

1171

1681

}

1172

1682

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

1173

1683

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

1174

1684

if(debug){

1175

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

1176

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1685

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1686

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

1177

1687

}

1178

1688

return false;

1179

1689

}

1180

1690

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

1181

1691

if(ifr->ifr_flags & IFF_NOARP){

1182

1692

if(debug){

1183

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

1184

"Rejecting non-ARP interface \"%s\"\n", ifname);

1693

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

1694

ifname);

1185

1695

}

1186

1696

return false;

1187

1697

}

1188

1698

1189

1699

/* Accept this device */

1190

1700

if(debug){

1191

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

1192

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

1701

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

1193

1702

}

1194

1703

return true;

1195

1704

}

1199

1708

* corresponds to an acceptable network device.

1200

1709

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

1201

1710

*/

1711

__attribute__((nonnull, warn_unused_result))

1202

1712

int good_interface(const struct dirent *if_entry){

1203

1713

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

1204

1714

return 0;

1207

1717

struct ifreq ifr;

1208

1718

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

1209

1719

if(debug){

1210

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

1211

"Failed to get flags for interface \"%s\"\n",

1212

if_entry->d_name);

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1219

}

1220

return 1;

1221

}

1222

1223

/*

1224

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

1225

* corresponds to an acceptable network device which is up.

1226

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

1227

*/

1228

int up_interface(const struct dirent *if_entry){

1229

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

1230

return 0;

1231

}

1232

1233

struct ifreq ifr;

1234

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

1235

if(debug){

1236

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

1237

"Failed to get flags for interface \"%s\"\n",

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

/* Reject down interfaces */

1244

if(not (ifr.ifr_flags & IFF_UP)){

1245

if(debug){

1246

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

1247

"Rejecting down interface \"%s\"\n",

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject non-running interfaces */

1254

if(not (ifr.ifr_flags & IFF_RUNNING)){

1255

if(debug){

1256

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

1257

"Rejecting non-running interface \"%s\"\n",

1258

if_entry->d_name);

1259

}

1260

return 0;

1261

}

1262

1263

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

1264

return 0;

1265

}

1266

return 1;

1267

}

1268

1720

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

1721

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

1722

}

1723

return 0;

1724

}

1725

1726

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

1727

return 0;

1728

}

1729

return 1;

1730

}

1731

1732

/*

1733

* This function determines if a network interface is up.

1734

*/

1735

__attribute__((nonnull, warn_unused_result))

1736

bool interface_is_up(const char *interface){

1737

struct ifreq ifr;

1738

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

1739

if(debug){

1740

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

1741

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

1742

}

1743

return false;

1744

}

1745

1746

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

1747

}

1748

1749

/*

1750

* This function determines if a network interface is running

1751

*/

1752

__attribute__((nonnull, warn_unused_result))

1753

bool interface_is_running(const char *interface){

1754

struct ifreq ifr;

1755

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

1756

if(debug){

1757

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

1758

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

1759

}

1760

return false;

1761

}

1762

1763

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

1764

}

1765

1766

__attribute__((nonnull, pure, warn_unused_result))

1269

1767

int notdotentries(const struct dirent *direntry){

1270

1768

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

1271

1769

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

1278

1776

}

1279

1777

1280

1778

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

1779

__attribute__((nonnull, warn_unused_result))

1281

1780

int runnable_hook(const struct dirent *direntry){

1282

1781

int ret;

1283

1782

size_t sret;

1291

1790

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

1292

1791

"abcdefghijklmnopqrstuvwxyz"

1293

1792

"0123456789"

1294

"_-");

1793

"_.-");

1295

1794

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

1296

1795

/* Contains non-allowed characters */

1297

1796

if(debug){

1298

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

1299

"Ignoring hook \"%s\" with bad name\n",

1300

direntry->d_name);

1797

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

1798

direntry->d_name);

1301

1799

}

1302

1800

return 0;

1303

1801

}

1304

1802

1305

char *fullname = NULL;

1306

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

1307

if(ret < 0){

1308

perror_plus("asprintf");

1309

return 0;

1310

}

1311

1312

ret = stat(fullname, &st);

1803

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1313

1804

if(ret == -1){

1314

1805

if(debug){

1315

1806

perror_plus("Could not stat hook");

1319

1810

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

1320

1811

/* Not a regular file */

1321

1812

if(debug){

1322

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

1323

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

1324

direntry->d_name);

1813

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

1814

direntry->d_name);

1325

1815

}

1326

1816

return 0;

1327

1817

}

1328

1818

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

1329

1819

/* Not executable */

1330

1820

if(debug){

1331

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

1332

"Ignoring hook \"%s\" - not executable\n",

1333

direntry->d_name);

1821

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

1822

direntry->d_name);

1334

1823

}

1335

1824

return 0;

1336

1825

}

1826

if(debug){

1827

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

1828

direntry->d_name);

1829

}

1337

1830

return 1;

1338

1831

}

1339

1832

1340

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1341

1836

int ret;

1342

1837

struct timespec now;

1343

1838

struct timespec waited_time;

1344

1839

intmax_t block_time;

1345

1840

1346

1841

while(true){

1347

if(mc.current_server == NULL){

1348

if (debug){

1349

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

1350

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

1842

if(mc->current_server == NULL){

1843

if(debug){

1844

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

1845

" No timeout!\n");

1351

1846

}

1352

1847

ret = avahi_simple_poll_iterate(s, -1);

1353

1848

} else {

1354

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1849

if(debug){

1850

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

1851

" it, or wait\n");

1358

1852

}

1359

1853

/* the current time */

1360

1854

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1365

1859

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

1366

1860

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

1367

1861

waited_time.tv_sec = (now.tv_sec

1368

- mc.current_server->last_seen.tv_sec);

1862

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

1369

1863

waited_time.tv_nsec = (now.tv_nsec

1370

- mc.current_server->last_seen.tv_nsec);

1864

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

1371

1865

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

1372

1866

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

1373

1867

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

1375

1869

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

1376

1870

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

1377

1871

1378

if (debug){

1379

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

1380

"Blocking for %" PRIdMAX " ms\n", block_time);

1872

if(debug){

1873

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

1874

block_time);

1381

1875

}

1382

1876

1383

1877

if(block_time <= 0){

1384

ret = start_mandos_communication(mc.current_server->ip,

1385

mc.current_server->port,

1386

mc.current_server->if_index,

1387

mc.current_server->af);

1878

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

1879

mc->current_server->port,

1880

mc->current_server->if_index,

1881

mc->current_server->af, mc);

1388

1882

if(ret == 0){

1389

avahi_simple_poll_quit(mc.simple_poll);

1883

avahi_simple_poll_quit(s);

1390

1884

return 0;

1391

1885

}

1392

1886

ret = clock_gettime(CLOCK_MONOTONIC,

1393

&mc.current_server->last_seen);

1887

&mc->current_server->last_seen);

1394

1888

if(ret == -1){

1395

1889

perror_plus("clock_gettime");

1396

1890

return -1;

1397

1891

}

1398

mc.current_server = mc.current_server->next;

1892

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

1399

1893

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

1400

1894

servers, but don't block */

1401

1895

}

1403

1897

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

1404

1898

}

1405

1899

if(ret != 0){

1406

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

1900

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

1407

1901

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

1408

1902

}

1409

1903

}

1410

1904

}

1411

1905

}

1412

1906

1907

__attribute__((nonnull))

1908

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

1909

const float delay){

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

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

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1927

runnable_hook, alphasort);

1928

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

perror_plus("open(\"/dev/null\", O_RDONLY)");

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1991

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1996

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

if(close(hookdir_fd) == -1){

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

2065

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

if(close(hookdir_fd) == -1){

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

2085

}

2086

2087

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2091

int ret;

2092

struct ifreq network;

2093

unsigned int if_index = if_nametoindex(interface);

2094

if(if_index == 0){

2095

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

2096

errno = old_errno;

2097

return ENXIO;

2098

}

2099

2100

if(quit_now){

2101

errno = old_errno;

2102

return EINTR;

2103

}

2104

2105

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

2109

ret_errno = errno;

2110

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

2111

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

2112

errno = old_errno;

2113

return ret_errno;

2114

}

2115

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

2116

2117

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

2118

if(sd == -1){

2119

ret_errno = errno;

2120

perror_plus("socket");

2121

errno = old_errno;

2122

return ret_errno;

2123

}

2124

2125

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

2130

errno = old_errno;

2131

return EINTR;

2132

}

2133

2134

if(debug){

2135

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

2136

interface);

2137

}

2138

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

2145

2146

#ifdef __linux__

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

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

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

2158

}

2159

#endif /* __linux__ */

2160

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

2161

ioctl_errno = errno;

2162

#ifdef __linux__

2163

if(restore_loglevel){

2164

ret_linux = klogctl(7, NULL, 0);

2165

if(ret_linux == -1){

2166

perror_plus("klogctl");

2167

}

2168

}

2169

#endif /* __linux__ */

2170

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

2180

2181

/* Close the socket */

2182

ret = close(sd);

2183

if(ret == -1){

2184

perror_plus("close");

2185

}

2186

2187

if(ret_setflags == -1){

2188

errno = ioctl_errno;

2189

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

errno = old_errno;

2191

return ioctl_errno;

2192

}

2193

} else if(debug){

2194

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

2195

interface);

2196

}

2197

2198

/* Sleep checking until interface is running.

2199

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

2200

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

2201

if(interface_is_running(interface)){

2202

break;

2203

}

2204

struct timespec sleeptime = { .tv_nsec = 250000000 };

2205

ret = nanosleep(&sleeptime, NULL);

2206

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

2207

perror_plus("nanosleep");

2208

}

2209

}

2210

2211

errno = old_errno;

2212

return 0;

2213

}

2214

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

2218

struct ifreq network;

2219

unsigned int if_index = if_nametoindex(interface);

2220

if(if_index == 0){

2221

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

2222

errno = old_errno;

2223

return ENXIO;

2224

}

2225

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2228

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

2229

ret_errno = errno;

2230

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

2231

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

2232

errno = old_errno;

2233

return ret_errno;

2234

}

2235

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

2236

2237

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

2238

if(sd == -1){

2239

ret_errno = errno;

2240

perror_plus("socket");

2241

errno = old_errno;

2242

return ret_errno;

2243

}

2244

2245

if(debug){

2246

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

2247

interface);

2248

}

2249

2250

/* Raise privileges */

2251

ret_errno = raise_privileges();

2252

if(ret_errno != 0){

2253

errno = ret_errno;

2254

perror_plus("Failed to raise privileges");

2255

}

2256

2257

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

2258

ioctl_errno = errno;

2259

2260

/* If raise_privileges() succeeded above */

2261

if(ret_errno == 0){

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

2269

2270

/* Close the socket */

2271

int ret = close(sd);

2272

if(ret == -1){

2273

perror_plus("close");

2274

}

2275

2276

if(ret_setflags == -1){

2277

errno = ioctl_errno;

2278

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2279

errno = old_errno;

2280

return ioctl_errno;

2281

}

2282

} else if(debug){

2283

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

2284

interface);

2285

}

2286

2287

errno = old_errno;

2288

return 0;

2289

}

2290

1413

2291

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

2292

mandos_context mc = { .server = NULL, .dh_bits = 0,

2293

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

2294

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

1414

2297

AvahiSServiceBrowser *sb = NULL;

1415

int error;

2298

error_t ret_errno;

1416

2299

int ret;

1417

2300

intmax_t tmpmax;

1418

2301

char *tmp;

1419

2302

int exitcode = EXIT_SUCCESS;

1420

const char *interface = "";

1421

struct ifreq network;

1422

int sd = -1;

1423

bool take_down_interface = false;

1424

uid_t uid;

1425

gid_t gid;

1426

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

1427

bool tempdir_created = false;

2303

char *interfaces_to_take_down = NULL;

2304

size_t interfaces_to_take_down_size = 0;

2305

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

2306

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

2307

char *tempdir = NULL;

1428

2308

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1429

2309

const char *seckey = PATHDIR "/" SECKEY;

1430

2310

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

char *interfaces_hooks = NULL;

1431

2313

1432

2314

bool gnutls_initialized = false;

1433

2315

bool gpgme_initialized = false;

1485

2367

.doc = "Bit length of the prime number used in the"

1486

2368

" Diffie-Hellman key exchange",

1487

2369

.group = 2 },

2370

{ .name = "dh-params", .key = 134,

2371

.arg = "FILE",

2372

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

1488

2375

{ .name = "priority", .key = 130,

1489

2376

.arg = "STRING",

1490

2377

.doc = "GnuTLS priority string for the TLS handshake",

1495

2382

.group = 2 },

1496

2383

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

1497

2384

.arg = "SECONDS",

1498

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

2385

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

1499

2386

.group = 2 },

1500

2387

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

1501

2388

.arg = "DIR",

1524

2411

connect_to = arg;

1525

2412

break;

1526

2413

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

1527

interface = arg;

2414

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

2415

arg, (int)',');

2416

if(ret_errno != 0){

2417

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

2418

}

1528

2419

break;

1529

2420

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

1530

2421

seckey = arg;

1541

2432

}

1542

2433

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1543

2434

break;

2435

case 134: /* --dh-params */

2436

dh_params_file = arg;

2437

break;

1544

2438

case 130: /* --priority */

1545

2439

mc.priority = arg;

1546

2440

break;

1573

2467

argp_state_help(state, state->out_stream,

1574

2468

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1575

2469

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

1576

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1577

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

2470

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

1578

2471

exit(argp_err_exit_status);

1579

2472

break;

1580

2473

default:

1587

2480

.args_doc = "",

1588

2481

.doc = "Mandos client -- Get and decrypt"

1589

2482

" passwords from a Mandos server" };

1590

ret = argp_parse(&argp, argc, argv,

1591

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1592

switch(ret){

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

1593

2486

case 0:

1594

2487

break;

1595

2488

case ENOMEM:

1596

2489

default:

1597

errno = ret;

2490

errno = ret_errno;

1598

2491

perror_plus("argp_parse");

1599

2492

exitcode = EX_OSERR;

1600

2493

goto end;

1603

2496

goto end;

1604

2497

}

1605

2498

}

1606

2499

1607

2500

{

1608

2501

/* Work around Debian bug #633582:

1609

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

1610

struct stat st;

1611

1612

/* Re-raise priviliges */

1613

errno = 0;

1614

ret = seteuid(0);

1615

if(ret == -1){

1616

perror_plus("seteuid");

1617

}

1618

1619

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

1620

int seckey_fd = open(seckey, O_RDONLY);

1621

if(seckey_fd == -1){

1622

perror_plus("open");

1623

} else {

1624

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

1625

if(ret == -1){

1626

perror_plus("fstat");

1627

} else {

1628

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

1629

ret = fchown(seckey_fd, uid, gid);

1630

if(ret == -1){

1631

perror_plus("fchown");

1632

}

1633

}

1634

}

1635

TEMP_FAILURE_RETRY(close(seckey_fd));

1636

}

1637

}

1638

1639

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

1640

int pubkey_fd = open(pubkey, O_RDONLY);

1641

if(pubkey_fd == -1){

1642

perror_plus("open");

1643

} else {

1644

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

1645

if(ret == -1){

1646

perror_plus("fstat");

1647

} else {

1648

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

1649

ret = fchown(pubkey_fd, uid, gid);

1650

if(ret == -1){

1651

perror_plus("fchown");

1652

}

1653

}

1654

}

1655

TEMP_FAILURE_RETRY(close(pubkey_fd));

1656

}

1657

}

1658

1659

/* Lower privileges */

1660

errno = 0;

1661

ret = seteuid(uid);

1662

if(ret == -1){

1663

perror_plus("seteuid");

1664

}

1665

}

1666

1667

/* Find network hooks and run them */

1668

{

1669

struct dirent **direntries;

1670

struct dirent *direntry;

1671

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

1672

alphasort);

1673

if(numhooks == -1){

1674

perror_plus("scandir");

2502

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

2503

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

1675

2509

} else {

1676

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

1677

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

1678

direntry = direntries[0];

1679

char *fullname = NULL;

1680

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

1681

if(ret < 0){

1682

perror_plus("asprintf");

1683

continue;

1684

}

1685

pid_t hook_pid = fork();

1686

if(hook_pid == 0){

1687

/* Child */

1688

dup2(devnull, STDIN_FILENO);

1689

close(devnull);

1690

dup2(STDERR_FILENO, STDOUT_FILENO);

1691

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

1692

if(ret == -1){

1693

perror_plus("setenv");

1694

exit(1);

1695

}

1696

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

1697

if(ret == -1){

1698

perror_plus("setenv");

1699

exit(1);

1700

}

1701

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

1702

if(ret == -1){

1703

perror_plus("setenv");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

perror_plus("setenv");

1709

exit(1);

1710

}

1711

char *delaystring;

1712

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

1713

if(ret == -1){

1714

perror_plus("asprintf");

1715

exit(1);

1716

}

1717

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

1718

if(ret == -1){

1719

free(delaystring);

1720

perror_plus("setenv");

1721

exit(1);

1722

}

1723

free(delaystring);

1724

ret = execl(fullname, direntry->d_name, "start", NULL);

1725

perror_plus("execl");

1726

} else {

1727

int status;

1728

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

1729

perror_plus("waitpid");

1730

free(fullname);

1731

continue;

1732

}

1733

if(WIFEXITED(status)){

1734

if(WEXITSTATUS(status) != 0){

1735

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

1736

"Warning: network hook \"%s\" exited"

1737

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

1738

WEXITSTATUS(status));

1739

free(fullname);

1740

continue;

1741

}

1742

} else if(WIFSIGNALED(status)){

1743

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

1744

"Warning: network hook \"%s\" died by"

1745

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

1746

WTERMSIG(status));

1747

free(fullname);

1748

continue;

1749

} else {

1750

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

1751

"Warning: network hook \"%s\" crashed\n",

1752

direntry->d_name);

1753

free(fullname);

1754

continue;

1755

}

1756

}

1757

free(fullname);

1758

if(quit_now){

1759

goto end;

1760

}

1761

}

1762

close(devnull);

1763

}

2510

struct stat st;

2511

2512

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

2513

int seckey_fd = open(seckey, O_RDONLY);

2514

if(seckey_fd == -1){

2515

perror_plus("open");

2516

} else {

2517

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

2518

if(ret == -1){

2519

perror_plus("fstat");

2520

} else {

2521

if(S_ISREG(st.st_mode)

2522

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

2523

ret = fchown(seckey_fd, uid, gid);

2524

if(ret == -1){

2525

perror_plus("fchown");

2526

}

2527

}

2528

}

2529

close(seckey_fd);

2530

}

2531

}

2532

2533

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

2534

int pubkey_fd = open(pubkey, O_RDONLY);

2535

if(pubkey_fd == -1){

2536

perror_plus("open");

2537

} else {

2538

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

2539

if(ret == -1){

2540

perror_plus("fstat");

2541

} else {

2542

if(S_ISREG(st.st_mode)

2543

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

2544

ret = fchown(pubkey_fd, uid, gid);

2545

if(ret == -1){

2546

perror_plus("fchown");

2547

}

2548

}

2549

}

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

2576

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

2581

}

2582

}

2583

}

2584

2585

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

2586

{

2587

char *interface = NULL;

2588

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

2589

interface))){

2590

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

2591

and if_nametoindex(interface) == 0){

2592

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

2593

fprintf_plus(stderr, "Not using nonexisting interface"

2594

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

2595

}

2596

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

2597

interface = NULL;

2598

}

2599

}

2600

}

2601

2602

/* Run network hooks */

2603

{

2604

if(mc.interfaces != NULL){

2605

interfaces_hooks = malloc(mc.interfaces_size);

2606

if(interfaces_hooks == NULL){

2607

perror_plus("malloc");

2608

goto end;

2609

}

2610

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

2611

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

2612

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

1764

2615

}

1765

2616

1766

2617

if(not debug){

1767

2618

avahi_set_log_function(empty_log);

1768

2619

}

1769

2620

1770

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

1771

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1774

alphasort);

1775

if(ret == 0){

1776

/* No up interfaces, look for any good interfaces */

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1781

if(ret >= 1){

1782

/* Pick the first interface returned */

1783

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

1784

if(debug){

1785

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

1786

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

1787

}

1788

if(interface == NULL){

1789

perror_plus("malloc");

1790

free(direntries);

1791

exitcode = EXIT_FAILURE;

1792

goto end;

1793

}

1794

free(direntries);

1795

} else {

1796

free(direntries);

1797

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

1798

"Could not find a network interface\n");

1799

exitcode = EXIT_FAILURE;

1800

goto end;

1801

}

1802

}

1803

1804

2621

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

1805

2622

from the signal handler */

1806

2623

/* Initialize the pseudo-RNG for Avahi */

1807

2624

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

1808

mc.simple_poll = avahi_simple_poll_new();

1809

if(mc.simple_poll == NULL){

1810

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

1811

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

2625

simple_poll = avahi_simple_poll_new();

2626

if(simple_poll == NULL){

2627

fprintf_plus(stderr,

2628

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

1812

2629

exitcode = EX_UNAVAILABLE;

1813

2630

goto end;

1814

2631

}

1876

2693

}

1877

2694

}

1878

2695

1879

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

1880

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

1881

if_index = (AvahiIfIndex) if_nametoindex(interface);

1882

if(if_index == 0){

1883

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

1884

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

1885

exitcode = EX_UNAVAILABLE;

1886

goto end;

1887

}

1888

1889

if(quit_now){

1890

goto end;

1891

}

1892

1893

/* Re-raise priviliges */

1894

errno = 0;

1895

ret = seteuid(0);

1896

if(ret == -1){

1897

perror_plus("seteuid");

1898

}

1899

1900

#ifdef __linux__

1901

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1902

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

1903

ret = klogctl(8, NULL, 5);

1904

bool restore_loglevel = true;

1905

if(ret == -1){

1906

restore_loglevel = false;

1907

perror_plus("klogctl");

1908

}

1909

#endif /* __linux__ */

1910

1911

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1912

if(sd < 0){

1913

perror_plus("socket");

1914

exitcode = EX_OSERR;

1915

#ifdef __linux__

1916

if(restore_loglevel){

1917

ret = klogctl(7, NULL, 0);

1918

if(ret == -1){

1919

perror_plus("klogctl");

1920

}

1921

}

1922

#endif /* __linux__ */

1923

/* Lower privileges */

1924

errno = 0;

1925

ret = seteuid(uid);

1926

if(ret == -1){

1927

perror_plus("seteuid");

1928

}

1929

goto end;

1930

}

1931

strcpy(network.ifr_name, interface);

1932

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

1933

if(ret == -1){

1934

perror_plus("ioctl SIOCGIFFLAGS");

1935

#ifdef __linux__

1936

if(restore_loglevel){

1937

ret = klogctl(7, NULL, 0);

1938

if(ret == -1){

1939

perror_plus("klogctl");

1940

}

1941

}

1942

#endif /* __linux__ */

1943

exitcode = EX_OSERR;

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

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

1953

network.ifr_flags |= IFF_UP;

1954

take_down_interface = true;

1955

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

1956

if(ret == -1){

1957

take_down_interface = false;

1958

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1959

exitcode = EX_OSERR;

1960

#ifdef __linux__

1961

if(restore_loglevel){

1962

ret = klogctl(7, NULL, 0);

1963

if(ret == -1){

1964

perror_plus("klogctl");

2696

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

2697

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2699

/* Look for any good interfaces */

2700

ret = scandir(sys_class_net, &direntries, good_interface,

2701

alphasort);

2702

if(ret >= 1){

2703

/* Add all found interfaces to interfaces list */

2704

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

2705

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

2706

direntries[i]->d_name);

2707

if(ret_errno != 0){

2708

errno = ret_errno;

2709

perror_plus("argz_add");

2710

free(direntries[i]);

2711

continue;

2712

}

2713

if(debug){

2714

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

2715

direntries[i]->d_name);

2716

}

2717

free(direntries[i]);

2718

}

2719

free(direntries);

2720

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2724

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

2725

exitcode = EXIT_FAILURE;

2726

goto end;

2727

}

2728

}

2729

2730

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

2731

{

2732

char *interface = NULL;

2733

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

2734

interface))){

2735

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

2736

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

2737

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

2738

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

2739

interface);

2740

interface = NULL;

2741

while((interface = argz_next(mc.interfaces,

2742

mc.interfaces_size, interface))){

2743

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

2744

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

2745

interface);

2746

interface = NULL;

1965

2747

}

1966

2748

}

1967

#endif /* __linux__ */

1968

/* Lower privileges */

1969

errno = 0;

1970

ret = seteuid(uid);

1971

if(ret == -1){

1972

perror_plus("seteuid");

1973

}

1974

goto end;

1975

}

1976

}

1977

/* Sleep checking until interface is running.

1978

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

1979

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

1980

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

1981

if(ret == -1){

1982

perror_plus("ioctl SIOCGIFFLAGS");

1983

} else if(network.ifr_flags & IFF_RUNNING){

1984

2749

break;

1985

2750

}

1986

struct timespec sleeptime = { .tv_nsec = 250000000 };

1987

ret = nanosleep(&sleeptime, NULL);

1988

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

1989

perror_plus("nanosleep");

1990

}

1991

}

1992

if(not take_down_interface){

1993

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

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

}

1999

#ifdef __linux__

2000

if(restore_loglevel){

2001

/* Restores kernel loglevel to default */

2002

ret = klogctl(7, NULL, 0);

2003

if(ret == -1){

2004

perror_plus("klogctl");

2005

}

2006

}

2007

#endif /* __linux__ */

2008

/* Lower privileges */

2009

errno = 0;

2010

if(take_down_interface){

2011

/* Lower privileges */

2012

ret = seteuid(uid);

2013

if(ret == -1){

2014

perror_plus("seteuid");

2015

}

2016

} else {

2017

/* Lower privileges permanently */

2018

ret = setuid(uid);

2019

if(ret == -1){

2020

perror_plus("setuid");

2021

}

2022

}

2751

bool interface_was_up = interface_is_up(interface);

2752

errno = bring_up_interface(interface, delay);

2753

if(not interface_was_up){

2754

if(errno != 0){

2755

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2756

" %s\n", interface, strerror(errno));

2757

} else {

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2762

perror_plus("argz_add");

2763

}

2764

}

2765

}

2766

}

2767

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

2768

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

2769

}

2770

}

2771

2772

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

2773

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

2774

if(debug){

2775

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

2776

mc.interfaces);

2777

}

2778

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

2023

2779

}

2024

2780

2025

2781

if(quit_now){

2026

2782

goto end;

2027

2783

}

2028

2784

2029

ret = init_gnutls_global(pubkey, seckey);

2785

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

2030

2786

if(ret == -1){

2031

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

2032

"init_gnutls_global failed\n");

2787

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

2033

2788

exitcode = EX_UNAVAILABLE;

2034

2789

goto end;

2035

2790

} else {

2040

2795

goto end;

2041

2796

}

2042

2797

2043

if(mkdtemp(tempdir) == NULL){

2798

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

2799

tempdir = mkdtemp(run_tempdir);

2800

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

2801

if(debug){

2802

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

2803

run_tempdir, old_tempdir);

2804

}

2805

tempdir = mkdtemp(old_tempdir);

2806

}

2807

if(tempdir == NULL){

2044

2808

perror_plus("mkdtemp");

2045

2809

goto end;

2046

2810

}

2047

tempdir_created = true;

2048

2811

2049

2812

if(quit_now){

2050

2813

goto end;

2051

2814

}

2052

2815

2053

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

2054

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

2055

"init_gpgme failed\n");

2816

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

2817

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

2056

2818

exitcode = EX_UNAVAILABLE;

2057

2819

goto end;

2058

2820

} else {

2067

2829

/* Connect directly, do not use Zeroconf */

2068

2830

/* (Mainly meant for debugging) */

2069

2831

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

2832

2070

2833

if(address == NULL){

2071

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

2072

"No colon in address\n");

2834

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

2073

2835

exitcode = EX_USAGE;

2074

2836

goto end;

2075

2837

}

2078

2840

goto end;

2079

2841

}

2080

2842

2081

uint16_t port;

2843

in_port_t port;

2082

2844

errno = 0;

2083

2845

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

2084

2846

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

2085

or tmpmax != (uint16_t)tmpmax){

2086

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

2087

"Bad port number\n");

2847

or tmpmax != (in_port_t)tmpmax){

2848

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

2088

2849

exitcode = EX_USAGE;

2089

2850

goto end;

2090

2851

}

2091

2852

2092

2853

if(quit_now){

2093

2854

goto end;

2094

2855

}

2095

2856

2096

port = (uint16_t)tmpmax;

2857

port = (in_port_t)tmpmax;

2097

2858

*address = '\0';

2098

2859

/* Colon in address indicates IPv6 */

2099

2860

int af;

2115

2876

}

2116

2877

2117

2878

while(not quit_now){

2118

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

2879

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

2880

&mc);

2119

2881

if(quit_now or ret == 0){

2120

2882

break;

2121

2883

}

2122

2884

if(debug){

2123

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

2124

"Retrying in %d seconds\n", (int)retry_interval);

2885

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

2886

(int)retry_interval);

2125

2887

}

2126

sleep((int)retry_interval);

2888

sleep((unsigned int)retry_interval);

2127

2889

}

2128

2890

2129

if (not quit_now){

2891

if(not quit_now){

2130

2892

exitcode = EXIT_SUCCESS;

2131

2893

}

2132

2894

2147

2909

config.publish_domain = 0;

2148

2910

2149

2911

/* Allocate a new server */

2150

mc.server = avahi_server_new(avahi_simple_poll_get

2151

(mc.simple_poll), &config, NULL,

2152

NULL, &error);

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2153

2914

2154

2915

/* Free the Avahi configuration data */

2155

2916

avahi_server_config_free(&config);

2157

2918

2158

2919

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

2159

2920

if(mc.server == NULL){

2160

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

2161

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

2162

avahi_strerror(error));

2921

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

2922

avahi_strerror(ret));

2163

2923

exitcode = EX_UNAVAILABLE;

2164

2924

goto end;

2165

2925

}

2171

2931

/* Create the Avahi service browser */

2172

2932

sb = avahi_s_service_browser_new(mc.server, if_index,

2173

2933

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2174

NULL, 0, browse_callback, NULL);

2934

NULL, 0, browse_callback,

2935

(void *)&mc);

2175

2936

if(sb == NULL){

2176

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

2177

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

2178

avahi_strerror(avahi_server_errno(mc.server)));

2937

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

2938

avahi_strerror(avahi_server_errno(mc.server)));

2179

2939

exitcode = EX_UNAVAILABLE;

2180

2940

goto end;

2181

2941

}

2187

2947

/* Run the main loop */

2188

2948

2189

2949

if(debug){

2190

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

2191

"Starting Avahi loop search\n");

2950

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

2192

2951

}

2193

2194

ret = avahi_loop_with_timeout(mc.simple_poll,

2195

(int)(retry_interval * 1000));

2952

2953

ret = avahi_loop_with_timeout(simple_poll,

2954

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

2196

2955

if(debug){

2197

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

2198

"avahi_loop_with_timeout exited %s\n",

2199

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

2956

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

2957

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

2200

2958

}

2201

2959

2202

2960

end:

2203

2961

2204

2962

if(debug){

2205

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

2206

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

2963

if(signal_received){

2964

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

2207

2970

}

2208

2971

2209

2972

/* Cleanup things */

2973

free(mc.interfaces);

2974

2210

2975

if(sb != NULL)

2211

2976

avahi_s_service_browser_free(sb);

2212

2977

2213

2978

if(mc.server != NULL)

2214

2979

avahi_server_free(mc.server);

2215

2980

2216

if(mc.simple_poll != NULL)

2217

avahi_simple_poll_free(mc.simple_poll);

2981

if(simple_poll != NULL)

2982

avahi_simple_poll_free(simple_poll);

2218

2983

2219

2984

if(gnutls_initialized){

2220

2985

gnutls_certificate_free_credentials(mc.cred);

2221

gnutls_global_deinit();

2222

2986

gnutls_dh_params_deinit(mc.dh_params);

2223

2987

}

2224

2988

2225

2989

if(gpgme_initialized){

2226

2990

gpgme_release(mc.ctx);

2227

2991

}

2228

2992

2229

2993

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

2230

2994

has seen */

2231

2995

if(mc.current_server != NULL){

2232

2996

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

2233

2997

while(mc.current_server != NULL){

2234

2998

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

free((char *)(mc.current_server->ip));

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

2235

3007

free(mc.current_server);

2236

3008

mc.current_server = next;

2237

3009

}

2238

3010

}

2239

3011

2240

/* XXX run network hooks "stop" here */

2241

2242

/* Take down the network interface */

2243

if(take_down_interface){

2244

/* Re-raise priviliges */

2245

errno = 0;

2246

ret = seteuid(0);

2247

if(ret == -1){

2248

perror_plus("seteuid");

2249

}

2250

if(geteuid() == 0){

2251

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

2252

if(ret == -1){

2253

perror_plus("ioctl SIOCGIFFLAGS");

2254

} else if(network.ifr_flags & IFF_UP){

2255

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

2256

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

2257

if(ret == -1){

2258

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2259

}

2260

}

2261

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

2262

if(ret == -1){

2263

perror_plus("close");

2264

}

2265

/* Lower privileges permanently */

2266

errno = 0;

2267

ret = setuid(uid);

2268

if(ret == -1){

2269

perror_plus("setuid");

2270

}

2271

}

3012

/* Re-raise privileges */

3013

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

3017

perror_plus("Failed to raise privileges");

3018

} else {

3019

3020

/* Run network hooks */

3021

run_network_hooks("stop", interfaces_hooks != NULL ?

3022

interfaces_hooks : "", delay);

3023

3024

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

3025

{

3026

char *interface = NULL;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

3033

perror_plus("Failed to take down interface");

3034

}

3035

}

3036

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

3037

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

3038

" down\n");

3039

}

3040

}

3041

}

3042

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

3046

perror_plus("Failed to lower privileges permanently");

3047

}

3048

}

3049

3050

free(interfaces_to_take_down);

3051

free(interfaces_hooks);

3052

3053

void clean_dir_at(int base, const char * const dirname,

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

int numentries = scandirat(dir_fd, ".", &direntries,

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3071

dirname, direntries[i]->d_name);

3072

}

3073

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

dret = unlinkat(dir_fd, direntries[i]->d_name,

3077

AT_REMOVEDIR);

3078

}

3079

if((dret == -1) and (errno == ENOTEMPTY)

3080

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3081

== 0) and (level == 0)){

3082

/* Recurse only in this special case */

3083

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3088

direntries[i]->d_name, strerror(errno));

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

2272

3107

}

2273

3108

2274

3109

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

2275

if(tempdir_created){

2276

struct dirent **direntries = NULL;

2277

struct dirent *direntry = NULL;

2278

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

2279

alphasort);

2280

if (numentries > 0){

2281

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

2282

direntry = direntries[i];

2283

char *fullname = NULL;

2284

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

2285

direntry->d_name);

2286

if(ret < 0){

2287

perror_plus("asprintf");

2288

continue;

2289

}

2290

ret = remove(fullname);

2291

if(ret == -1){

2292

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

2293

"remove(\"%s\"): %s\n", fullname, strerror(errno));

2294

}

2295

free(fullname);

2296

}

2297

}

2298

2299

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

2300

free(direntries);

2301

if (numentries == -1){

2302

perror_plus("scandir");

2303

}

2304

ret = rmdir(tempdir);

2305

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

2306

perror_plus("rmdir");

2307

}

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

2308

3112

}

2309

3113

2310

3114

if(quit_now){