/mandos/trunk : revision 505.3.6

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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 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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*

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

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* along with this program. If not, see

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

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*

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

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*/

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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 /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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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() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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

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

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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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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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#include <time.h> /* nanosleep(), time(), sleep() */

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#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(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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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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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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

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if(buffer == NULL){

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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

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int af){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return false;

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return -1;

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}

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

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.port = port,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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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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return -1;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

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} else {

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

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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mc.current_server->prev = new_server;

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}

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

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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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}

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/*

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* Initialize GPGME.

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*/

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__attribute__((nonnull, warn_unused_result))

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

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const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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bool import_key(const char * const filename){

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bool import_key(const char *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_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf(stderr, "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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return false;

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf(stderr, "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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return false;

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}

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ret = close(fd);

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ret = (int)TEMP_FAILURE_RETRY(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_plus(stderr, "Initializing GPGME\n");

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

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"Initializing GPGME\n");

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf(stderr, "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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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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}

350

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if(engine_info == NULL){

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

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tempdir);

310

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

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

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return false;

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}

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/* Create new GPGME "context" */

357

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

316

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

358

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if(rc != GPG_ERR_NO_ERROR){

359

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

360

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

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gpgme_strerror(rc));

318

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

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

320

gpgme_strerror(rc));

362

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return false;

363

322

}

364

323

373

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* Decrypt OpenPGP data.

374

333

* Returns -1 on error

375

334

*/

376

__attribute__((nonnull, warn_unused_result))

377

335

static ssize_t pgp_packet_decrypt(const char *cryptotext,

378

336

size_t crypto_size,

379

char **plaintext,

380

mandos_context *mc){

337

char **plaintext){

381

338

gpgme_data_t dh_crypto, dh_plain;

382

339

gpgme_error_t rc;

383

340

ssize_t ret;

385

342

ssize_t plaintext_length = 0;

386

343

387

344

if(debug){

388

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

345

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

346

"Trying to decrypt OpenPGP data\n");

389

347

}

390

348

391

349

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

392

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

393

351

0);

394

352

if(rc != GPG_ERR_NO_ERROR){

395

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

396

gpgme_strsource(rc), gpgme_strerror(rc));

353

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

397

356

return -1;

398

357

}

399

358

400

359

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

401

360

rc = gpgme_data_new(&dh_plain);

402

361

if(rc != GPG_ERR_NO_ERROR){

403

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

404

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

405

gpgme_strsource(rc), gpgme_strerror(rc));

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

406

365

gpgme_data_release(dh_crypto);

407

366

return -1;

408

367

}

409

368

410

369

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

411

370

data buffer */

412

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

371

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

413

372

if(rc != GPG_ERR_NO_ERROR){

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

416

376

plaintext_length = -1;

417

377

if(debug){

418

378

gpgme_decrypt_result_t result;

419

result = gpgme_op_decrypt_result(mc->ctx);

379

result = gpgme_op_decrypt_result(mc.ctx);

420

380

if(result == NULL){

421

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

381

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

382

"gpgme_op_decrypt_result failed\n");

422

383

} else {

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);

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);

427

390

if(result->file_name != NULL){

428

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

391

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

392

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

429

393

}

430

394

gpgme_recipient_t recipient;

431

395

recipient = result->recipients;

432

396

while(recipient != NULL){

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");

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");

440

406

recipient = recipient->next;

441

407

}

442

408

}

445

411

}

446

412

447

413

if(debug){

448

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

449

416

}

450

417

451

418

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

482

449

}

483

450

484

451

if(debug){

485

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

452

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

453

"Decrypted password is: ");

486

454

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

487

455

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

488

456

}

499

467

return plaintext_length;

500

468

}

501

469

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);

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;

513

476

}

514

477

515

478

/* GnuTLS log function callback */

516

__attribute__((nonnull))

517

479

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

518

480

const char* string){

519

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

481

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

520

482

}

521

483

522

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

523

484

static int init_gnutls_global(const char *pubkeyfilename,

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

485

const char *seckeyfilename){

527

486

int ret;

528

unsigned int uret;

529

487

530

488

if(debug){

531

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

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;

532

498

}

533

499

534

500

if(debug){

540

506

}

541

507

542

508

/* OpenPGP credentials */

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

544

510

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

511

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

512

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

513

gnutls_global_deinit();

547

514

return -1;

548

515

}

549

516

550

517

if(debug){

551

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

552

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

553

pubkeyfilename,

554

seckeyfilename);

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);

555

522

}

556

523

557

524

ret = gnutls_certificate_set_openpgp_key_file

558

(mc->cred, pubkeyfilename, seckeyfilename,

525

(mc.cred, pubkeyfilename, seckeyfilename,

559

526

GNUTLS_OPENPGP_FMT_BASE64);

560

527

if(ret != GNUTLS_E_SUCCESS){

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));

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));

566

534

goto globalfail;

567

535

}

568

536

569

537

/* GnuTLS server initialization */

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);

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);

751

554

752

555

return 0;

753

556

754

557

globalfail:

755

558

756

gnutls_certificate_free_credentials(mc->cred);

757

gnutls_dh_params_deinit(mc->dh_params);

559

gnutls_certificate_free_credentials(mc.cred);

560

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

758

562

return -1;

759

563

}

760

564

761

__attribute__((nonnull, warn_unused_result))

762

static int init_gnutls_session(gnutls_session_t *session,

763

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

764

566

int ret;

765

567

/* GnuTLS session creation */

766

568

do {

770

572

}

771

573

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

772

574

if(ret != GNUTLS_E_SUCCESS){

773

fprintf_plus(stderr,

774

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

775

safer_gnutls_strerror(ret));

575

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

576

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

577

safer_gnutls_strerror(ret));

776

578

}

777

579

778

580

{

779

581

const char *err;

780

582

do {

781

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

583

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

782

584

if(quit_now){

783

585

gnutls_deinit(*session);

784

586

return -1;

785

587

}

786

588

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

787

589

if(ret != GNUTLS_E_SUCCESS){

788

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

789

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

790

safer_gnutls_strerror(ret));

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));

791

594

gnutls_deinit(*session);

792

595

return -1;

793

596

}

795

598

796

599

do {

797

600

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

798

mc->cred);

601

mc.cred);

799

602

if(quit_now){

800

603

gnutls_deinit(*session);

801

604

return -1;

802

605

}

803

606

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

804

607

if(ret != GNUTLS_E_SUCCESS){

805

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

806

safer_gnutls_strerror(ret));

608

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

609

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

610

safer_gnutls_strerror(ret));

807

611

gnutls_deinit(*session);

808

612

return -1;

809

613

}

811

615

/* ignore client certificate if any. */

812

616

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

813

617

618

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

619

814

620

return 0;

815

621

}

816

622

818

624

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

819

625

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

820

626

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

1039

627

/* Called when a Mandos server is found */

1040

__attribute__((nonnull, warn_unused_result))

1041

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

628

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

1042

629

AvahiIfIndex if_index,

1043

int af, mandos_context *mc){

630

int af){

1044

631

int ret, tcp_sd = -1;

1045

632

ssize_t sret;

1046

struct sockaddr_storage to;

633

union {

634

struct sockaddr_in in;

635

struct sockaddr_in6 in6;

636

} to;

1047

637

char *buffer = NULL;

1048

638

char *decrypted_buffer = NULL;

1049

639

size_t buffer_length = 0;

1052

642

int retval = -1;

1053

643

gnutls_session_t session;

1054

644

int pf; /* Protocol family */

1055

bool route_added = false;

1056

645

1057

646

errno = 0;

1058

647

1069

658

pf = PF_INET;

1070

659

break;

1071

660

default:

1072

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

661

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

662

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

1073

663

errno = EINVAL;

1074

664

return -1;

1075

665

}

1076

666

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);

667

ret = init_gnutls_session(&session);

1111

668

if(ret != 0){

1112

669

return -1;

1113

670

}

1114

671

1115

672

if(debug){

1116

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

1117

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

673

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

674

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

675

"\n", ip, port);

1118

676

}

1119

677

1120

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

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

679

if(tcp_sd < 0){

1122

680

int e = errno;

1123

681

perror_plus("socket");

1130

688

goto mandos_end;

1131

689

}

1132

690

691

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

1133

692

if(af == AF_INET6){

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);

693

to.in6.sin6_family = (sa_family_t)af;

694

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

1137

695

} else { /* IPv4 */

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);

696

to.in.sin_family = (sa_family_t)af;

697

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

1141

698

}

1142

699

if(ret < 0 ){

1143

700

int e = errno;

1147

704

}

1148

705

if(ret == 0){

1149

706

int e = errno;

1150

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

707

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

708

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

1151

709

errno = e;

1152

710

goto mandos_end;

1153

711

}

1154

712

if(af == AF_INET6){

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

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*/

1158

720

if(if_index == AVAHI_IF_UNSPEC){

1159

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

1160

" incomplete without a network interface\n");

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

1161

724

errno = EINVAL;

1162

725

goto mandos_end;

1163

726

}

1164

727

/* Set the network interface number as scope */

1165

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

728

to.in6.sin6_scope_id = (uint32_t)if_index;

1166

729

}

1167

730

} else {

1168

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

731

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

732

-Wconversion and

733

-Wunreachable-code */

1169

734

}

1170

735

1171

736

if(quit_now){

1179

744

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

1180

745

perror_plus("if_indextoname");

1181

746

} else {

1182

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

1183

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

747

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

748

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

749

ip, interface, port);

1184

750

}

1185

751

} else {

1186

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

1187

ip, (uintmax_t)port);

752

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

753

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

1188

754

}

1189

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1190

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

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;

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;

1271

797

}

1272

798

1273

799

const char *out = mandos_protocol_version;

1301

827

}

1302

828

1303

829

if(debug){

1304

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

830

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

831

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

1305

832

}

1306

833

1307

834

if(quit_now){

1309

836

goto mandos_end;

1310

837

}

1311

838

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);

839

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

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1317

841

1318

842

if(quit_now){

1319

843

errno = EINTR;

1330

854

1331

855

if(ret != GNUTLS_E_SUCCESS){

1332

856

if(debug){

1333

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

857

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

858

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

1334

859

gnutls_perror(ret);

1335

860

}

1336

861

errno = EPROTO;

1340

865

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

1341

866

1342

867

if(debug){

1343

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1344

" %s\n", ip);

868

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

869

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

1345

870

}

1346

871

1347

872

while(true){

1385

910

}

1386

911

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

1387

912

if(ret < 0){

1388

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

1389

"***\n");

913

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

914

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

1390

915

gnutls_perror(ret);

1391

916

errno = EPROTO;

1392

917

goto mandos_end;

1393

918

}

1394

919

break;

1395

920

default:

1396

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

1397

" encrypted session with Mandos server\n");

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

1398

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1399

925

errno = EIO;

1400

926

goto mandos_end;

1405

931

}

1406

932

1407

933

if(debug){

1408

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

934

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

935

"Closing TLS session\n");

1409

936

}

1410

937

1411

938

if(quit_now){

1424

951

if(buffer_length > 0){

1425

952

ssize_t decrypted_buffer_size;

1426

953

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1427

&decrypted_buffer, mc);

954

&decrypted_buffer);

1428

955

if(decrypted_buffer_size >= 0){

1429

956

1430

clearerr(stdout);

1431

957

written = 0;

1432

958

while(written < (size_t) decrypted_buffer_size){

1433

959

if(quit_now){

1441

967

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

1442

968

int e = errno;

1443

969

if(debug){

1444

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

1445

strerror(errno));

970

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

971

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

972

strerror(errno));

1446

973

}

1447

974

errno = e;

1448

975

goto mandos_end;

1449

976

}

1450

977

written += (size_t)ret;

1451

978

}

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

}

1462

979

retval = 0;

1463

980

}

1464

981

}

1467

984

1468

985

mandos_end:

1469

986

{

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

}

1476

987

int e = errno;

1477

988

free(decrypted_buffer);

1478

989

free(buffer);

1479

990

if(tcp_sd >= 0){

1480

ret = close(tcp_sd);

991

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

1481

992

}

1482

993

if(ret == -1){

1483

994

if(e == 0){

1508

1019

AVAHI_GCC_UNUSED AvahiStringList *txt,

1509

1020

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1510

1021

flags,

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

1022

AVAHI_GCC_UNUSED void* userdata){

1023

assert(r);

1515

1024

1516

1025

/* Called whenever a service has been resolved successfully or

1517

1026

timed out */

1518

1027

1519

1028

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1521

1029

return;

1522

1030

}

1523

1031

1524

1032

switch(event){

1525

1033

default:

1526

1034

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

1532

1039

break;

1533

1040

1534

1041

case AVAHI_RESOLVER_FOUND:

1536

1043

char ip[AVAHI_ADDRESS_STR_MAX];

1537

1044

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

1538

1045

if(debug){

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);

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);

1542

1050

}

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

1051

int ret = start_mandos_communication(ip, port, interface,

1052

avahi_proto_to_af(proto));

1547

1053

if(ret == 0){

1548

avahi_simple_poll_quit(simple_poll);

1054

avahi_simple_poll_quit(mc.simple_poll);

1549

1055

} else {

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

}

1056

ret = add_server(ip, port, interface,

1057

avahi_proto_to_af(proto));

1556

1058

}

1557

1059

}

1558

1060

}

1568

1070

const char *domain,

1569

1071

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1570

1072

flags,

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

1073

AVAHI_GCC_UNUSED void* userdata){

1074

assert(b);

1575

1075

1576

1076

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

1577

1077

is removed from the LAN */

1584

1084

default:

1585

1085

case AVAHI_BROWSER_FAILURE:

1586

1086

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);

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);

1591

1091

return;

1592

1092

1593

1093

case AVAHI_BROWSER_NEW:

1596

1096

the callback function is called the Avahi server will free the

1597

1097

resolver for us. */

1598

1098

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)));

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)));

1607

1105

break;

1608

1106

1609

1107

case AVAHI_BROWSER_REMOVE:

1612

1110

case AVAHI_BROWSER_ALL_FOR_NOW:

1613

1111

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1614

1112

if(debug){

1615

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

1616

" searching...\n");

1113

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

1114

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

1617

1115

}

1618

1116

break;

1619

1117

}

1628

1126

signal_received = sig;

1629

1127

int old_errno = errno;

1630

1128

/* set main loop to exit */

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1129

if(mc.simple_poll != NULL){

1130

avahi_simple_poll_quit(mc.simple_poll);

1633

1131

}

1634

1132

errno = old_errno;

1635

1133

}

1636

1134

1637

__attribute__((nonnull, warn_unused_result))

1638

1135

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

1639

1136

int ret;

1640

int old_errno;

1641

1137

1642

1138

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

1643

1139

if(s < 0){

1644

old_errno = errno;

1645

1140

perror_plus("socket");

1646

errno = old_errno;

1647

1141

return false;

1648

1142

}

1649

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

1650

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

1143

strcpy(ifr->ifr_name, ifname);

1651

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

1145

if(ret == -1){

1653

1146

if(debug){

1654

old_errno = errno;

1655

1147

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1657

1148

}

1658

1149

return false;

1659

1150

}

1660

1151

return true;

1661

1152

}

1662

1153

1663

__attribute__((nonnull, warn_unused_result))

1664

1154

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

1665

1155

1666

1156

/* Reject the loopback device */

1667

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1668

1158

if(debug){

1669

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

1670

ifname);

1159

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

1160

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

1671

1161

}

1672

1162

return false;

1673

1163

}

1674

1164

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

1675

1165

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

1676

1166

if(debug){

1677

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

1678

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

1167

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

1168

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

1679

1169

}

1680

1170

return true;

1681

1171

}

1682

1172

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

1683

1173

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

1684

1174

if(debug){

1685

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1686

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

1175

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

1176

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

1687

1177

}

1688

1178

return false;

1689

1179

}

1690

1180

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

1691

1181

if(ifr->ifr_flags & IFF_NOARP){

1692

1182

if(debug){

1693

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

1694

ifname);

1183

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

1184

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

1695

1185

}

1696

1186

return false;

1697

1187

}

1698

1188

1699

1189

/* Accept this device */

1700

1190

if(debug){

1701

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

1191

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

1192

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

1702

1193

}

1703

1194

return true;

1704

1195

}

1708

1199

* corresponds to an acceptable network device.

1709

1200

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

1710

1201

*/

1711

__attribute__((nonnull, warn_unused_result))

1712

1202

int good_interface(const struct dirent *if_entry){

1713

1203

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

1714

1204

return 0;

1717

1207

struct ifreq ifr;

1718

1208

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

1719

1209

if(debug){

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))

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

1767

1269

int notdotentries(const struct dirent *direntry){

1768

1270

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

1769

1271

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

1776

1278

}

1777

1279

1778

1280

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

1779

__attribute__((nonnull, warn_unused_result))

1780

1281

int runnable_hook(const struct dirent *direntry){

1781

1282

int ret;

1782

1283

size_t sret;

1790

1291

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

1791

1292

"abcdefghijklmnopqrstuvwxyz"

1792

1293

"0123456789"

1793

"_.-");

1294

"_-");

1794

1295

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

1795

1296

/* Contains non-allowed characters */

1796

1297

if(debug){

1797

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

1798

direntry->d_name);

1298

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

1299

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

1300

direntry->d_name);

1799

1301

}

1800

1302

return 0;

1801

1303

}

1802

1304

1803

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

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);

1804

1313

if(ret == -1){

1805

1314

if(debug){

1806

1315

perror_plus("Could not stat hook");

1810

1319

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

1811

1320

/* Not a regular file */

1812

1321

if(debug){

1813

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

1814

direntry->d_name);

1322

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

1323

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

1324

direntry->d_name);

1815

1325

}

1816

1326

return 0;

1817

1327

}

1818

1328

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

1819

1329

/* Not executable */

1820

1330

if(debug){

1821

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

1822

direntry->d_name);

1331

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

1332

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

1333

direntry->d_name);

1823

1334

}

1824

1335

return 0;

1825

1336

}

1826

if(debug){

1827

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

1828

direntry->d_name);

1829

}

1830

1337

return 1;

1831

1338

}

1832

1339

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1340

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1836

1341

int ret;

1837

1342

struct timespec now;

1838

1343

struct timespec waited_time;

1839

1344

intmax_t block_time;

1840

1345

1841

1346

while(true){

1842

if(mc->current_server == NULL){

1843

if(debug){

1844

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

1845

" No timeout!\n");

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");

1846

1351

}

1847

1352

ret = avahi_simple_poll_iterate(s, -1);

1848

1353

} else {

1849

if(debug){

1850

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

1851

" it, or wait\n");

1354

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1852

1358

}

1853

1359

/* the current time */

1854

1360

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1859

1365

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

1860

1366

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

1861

1367

waited_time.tv_sec = (now.tv_sec

1862

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

1368

- mc.current_server->last_seen.tv_sec);

1863

1369

waited_time.tv_nsec = (now.tv_nsec

1864

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

1370

- mc.current_server->last_seen.tv_nsec);

1865

1371

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

1866

1372

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

1867

1373

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

1869

1375

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

1870

1376

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

1871

1377

1872

if(debug){

1873

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

1874

block_time);

1378

if (debug){

1379

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

1380

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

1875

1381

}

1876

1382

1877

1383

if(block_time <= 0){

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);

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);

1882

1388

if(ret == 0){

1883

avahi_simple_poll_quit(s);

1389

avahi_simple_poll_quit(mc.simple_poll);

1884

1390

return 0;

1885

1391

}

1886

1392

ret = clock_gettime(CLOCK_MONOTONIC,

1887

&mc->current_server->last_seen);

1393

&mc.current_server->last_seen);

1888

1394

if(ret == -1){

1889

1395

perror_plus("clock_gettime");

1890

1396

return -1;

1891

1397

}

1892

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

1398

mc.current_server = mc.current_server->next;

1893

1399

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

1894

1400

servers, but don't block */

1895

1401

}

1897

1403

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

1898

1404

}

1899

1405

if(ret != 0){

1900

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

1406

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

1901

1407

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

1902

1408

}

1903

1409

}

1904

1410

}

1905

1411

}

1906

1412

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

1927

if(devnull == -1){

1928

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

1929

return;

1930

}

1931

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

1932

runnable_hook, alphasort);

1933

if(numhooks == -1){

1934

perror_plus("scandir");

1935

close(devnull);

1936

return;

1937

}

1938

struct dirent *direntry;

1939

int ret;

1940

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

1941

direntry = direntries[i];

1942

if(debug){

1943

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

1944

direntry->d_name);

1945

}

1946

pid_t hook_pid = fork();

1947

if(hook_pid == 0){

1948

/* Child */

1949

/* Raise privileges */

1950

errno = raise_privileges_permanently();

1951

if(errno != 0){

1952

perror_plus("Failed to raise privileges");

1953

_exit(EX_NOPERM);

1954

}

1955

/* Set group */

1956

errno = 0;

1957

ret = setgid(0);

1958

if(ret == -1){

1959

perror_plus("setgid");

1960

_exit(EX_NOPERM);

1961

}

1962

/* Reset supplementary groups */

1963

errno = 0;

1964

ret = setgroups(0, NULL);

1965

if(ret == -1){

1966

perror_plus("setgroups");

1967

_exit(EX_NOPERM);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

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

1975

if(ret == -1){

1976

perror_plus("setenv");

1977

_exit(EX_OSERR);

1978

}

1979

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

1980

if(ret == -1){

1981

perror_plus("setenv");

1982

_exit(EX_OSERR);

1983

}

1984

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

1985

if(ret == -1){

1986

perror_plus("setenv");

1987

_exit(EX_OSERR);

1988

}

1989

char *delaystring;

1990

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

1991

if(ret == -1){

1992

perror_plus("asprintf");

1993

_exit(EX_OSERR);

1994

}

1995

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

1996

if(ret == -1){

1997

free(delaystring);

1998

perror_plus("setenv");

1999

_exit(EX_OSERR);

2000

}

2001

free(delaystring);

2002

if(connect_to != NULL){

2003

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

2004

if(ret == -1){

2005

perror_plus("setenv");

2006

_exit(EX_OSERR);

2007

}

2008

}

2009

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

2010

direntry->d_name,

2011

O_RDONLY));

2012

if(hook_fd == -1){

2013

perror_plus("openat");

2014

_exit(EXIT_FAILURE);

2015

}

2016

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

2017

perror_plus("close");

2018

_exit(EXIT_FAILURE);

2019

}

2020

ret = dup2(devnull, STDIN_FILENO);

2021

if(ret == -1){

2022

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

2023

_exit(EX_OSERR);

2024

}

2025

ret = close(devnull);

2026

if(ret == -1){

2027

perror_plus("close");

2028

_exit(EX_OSERR);

2029

}

2030

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2031

if(ret == -1){

2032

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

2033

_exit(EX_OSERR);

2034

}

2035

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

2036

environ) == -1){

2037

perror_plus("fexecve");

2038

_exit(EXIT_FAILURE);

2039

}

2040

} else {

2041

if(hook_pid == -1){

2042

perror_plus("fork");

2043

free(direntry);

2044

continue;

2045

}

2046

int status;

2047

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

2048

perror_plus("waitpid");

2049

free(direntry);

2050

continue;

2051

}

2052

if(WIFEXITED(status)){

2053

if(WEXITSTATUS(status) != 0){

2054

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

2055

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

2056

WEXITSTATUS(status));

2057

free(direntry);

2058

continue;

2059

}

2060

} else if(WIFSIGNALED(status)){

2061

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

2062

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

2063

WTERMSIG(status));

2064

free(direntry);

2065

continue;

2066

} else {

2067

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

2068

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

2069

free(direntry);

2070

continue;

2071

}

2072

}

2073

if(debug){

2074

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

2075

direntry->d_name);

2076

}

2077

free(direntry);

2078

}

2079

free(direntries);

2080

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

2081

perror_plus("close");

2082

} else {

2083

hookdir_fd = -1;

2084

}

2085

close(devnull);

2086

}

2087

2088

__attribute__((nonnull, warn_unused_result))

2089

int bring_up_interface(const char *const interface,

2090

const float delay){

2091

int old_errno = errno;

2092

int ret;

2093

struct ifreq network;

2094

unsigned int if_index = if_nametoindex(interface);

2095

if(if_index == 0){

2096

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

2097

errno = old_errno;

2098

return ENXIO;

2099

}

2100

2101

if(quit_now){

2102

errno = old_errno;

2103

return EINTR;

2104

}

2105

2106

if(not interface_is_up(interface)){

2107

int ret_errno = 0;

2108

int ioctl_errno = 0;

2109

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

2110

ret_errno = errno;

2111

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

2112

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

2113

errno = old_errno;

2114

return ret_errno;

2115

}

2116

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

2117

2118

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

2119

if(sd == -1){

2120

ret_errno = errno;

2121

perror_plus("socket");

2122

errno = old_errno;

2123

return ret_errno;

2124

}

2125

2126

if(quit_now){

2127

ret = close(sd);

2128

if(ret == -1){

2129

perror_plus("close");

2130

}

2131

errno = old_errno;

2132

return EINTR;

2133

}

2134

2135

if(debug){

2136

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

2137

interface);

2138

}

2139

2140

/* Raise privileges */

2141

ret_errno = raise_privileges();

2142

if(ret_errno != 0){

2143

errno = ret_errno;

2144

perror_plus("Failed to raise privileges");

2145

}

2146

2147

#ifdef __linux__

2148

int ret_linux;

2149

bool restore_loglevel = false;

2150

if(ret_errno == 0){

2151

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2152

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

2153

ret_linux = klogctl(8, NULL, 5);

2154

if(ret_linux == -1){

2155

perror_plus("klogctl");

2156

} else {

2157

restore_loglevel = true;

2158

}

2159

}

2160

#endif /* __linux__ */

2161

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

2162

ioctl_errno = errno;

2163

#ifdef __linux__

2164

if(restore_loglevel){

2165

ret_linux = klogctl(7, NULL, 0);

2166

if(ret_linux == -1){

2167

perror_plus("klogctl");

2168

}

2169

}

2170

#endif /* __linux__ */

2171

2172

/* If raise_privileges() succeeded above */

2173

if(ret_errno == 0){

2174

/* Lower privileges */

2175

ret_errno = lower_privileges();

2176

if(ret_errno != 0){

2177

errno = ret_errno;

2178

perror_plus("Failed to lower privileges");

2179

}

2180

}

2181

2182

/* Close the socket */

2183

ret = close(sd);

2184

if(ret == -1){

2185

perror_plus("close");

2186

}

2187

2188

if(ret_setflags == -1){

2189

errno = ioctl_errno;

2190

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2191

errno = old_errno;

2192

return ioctl_errno;

2193

}

2194

} else if(debug){

2195

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

2196

interface);

2197

}

2198

2199

/* Sleep checking until interface is running.

2200

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

2201

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

2202

if(interface_is_running(interface)){

2203

break;

2204

}

2205

struct timespec sleeptime = { .tv_nsec = 250000000 };

2206

ret = nanosleep(&sleeptime, NULL);

2207

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

2208

perror_plus("nanosleep");

2209

}

2210

}

2211

2212

errno = old_errno;

2213

return 0;

2214

}

2215

2216

__attribute__((nonnull, warn_unused_result))

2217

int take_down_interface(const char *const interface){

2218

int old_errno = errno;

2219

struct ifreq network;

2220

unsigned int if_index = if_nametoindex(interface);

2221

if(if_index == 0){

2222

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

2223

errno = old_errno;

2224

return ENXIO;

2225

}

2226

if(interface_is_up(interface)){

2227

int ret_errno = 0;

2228

int ioctl_errno = 0;

2229

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

2230

ret_errno = errno;

2231

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

2232

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

2233

errno = old_errno;

2234

return ret_errno;

2235

}

2236

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

2237

2238

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

2239

if(sd == -1){

2240

ret_errno = errno;

2241

perror_plus("socket");

2242

errno = old_errno;

2243

return ret_errno;

2244

}

2245

2246

if(debug){

2247

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

2248

interface);

2249

}

2250

2251

/* Raise privileges */

2252

ret_errno = raise_privileges();

2253

if(ret_errno != 0){

2254

errno = ret_errno;

2255

perror_plus("Failed to raise privileges");

2256

}

2257

2258

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

2259

ioctl_errno = errno;

2260

2261

/* If raise_privileges() succeeded above */

2262

if(ret_errno == 0){

2263

/* Lower privileges */

2264

ret_errno = lower_privileges();

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("Failed to lower privileges");

2268

}

2269

}

2270

2271

/* Close the socket */

2272

int ret = close(sd);

2273

if(ret == -1){

2274

perror_plus("close");

2275

}

2276

2277

if(ret_setflags == -1){

2278

errno = ioctl_errno;

2279

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2280

errno = old_errno;

2281

return ioctl_errno;

2282

}

2283

} else if(debug){

2284

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

2285

interface);

2286

}

2287

2288

errno = old_errno;

2289

return 0;

2290

}

2291

2292

1413

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

2293

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

2294

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

2295

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

2296

.current_server = NULL, .interfaces = NULL,

2297

.interfaces_size = 0 };

2298

1414

AvahiSServiceBrowser *sb = NULL;

2299

error_t ret_errno;

1415

int error;

2300

1416

int ret;

2301

1417

intmax_t tmpmax;

2302

1418

char *tmp;

2303

1419

int exitcode = EXIT_SUCCESS;

2304

char *interfaces_to_take_down = NULL;

2305

size_t interfaces_to_take_down_size = 0;

2306

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

2307

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

2308

char *tempdir = NULL;

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;

2309

1428

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2310

1429

const char *seckey = PATHDIR "/" SECKEY;

2311

1430

const char *pubkey = PATHDIR "/" PUBKEY;

2312

const char *dh_params_file = NULL;

2313

char *interfaces_hooks = NULL;

2314

1431

2315

1432

bool gnutls_initialized = false;

2316

1433

bool gpgme_initialized = false;

2368

1485

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

2369

1486

" Diffie-Hellman key exchange",

2370

1487

.group = 2 },

2371

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

2372

.arg = "FILE",

2373

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

2374

" for the Diffie-Hellman key exchange",

2375

.group = 2 },

2376

1488

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

2377

1489

.arg = "STRING",

2378

1490

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

2383

1495

.group = 2 },

2384

1496

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

2385

1497

.arg = "SECONDS",

2386

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

1498

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

2387

1499

.group = 2 },

2388

1500

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

2389

1501

.arg = "DIR",

2412

1524

connect_to = arg;

2413

1525

break;

2414

1526

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

2415

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

2416

arg, (int)',');

2417

if(ret_errno != 0){

2418

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

2419

}

1527

interface = arg;

2420

1528

break;

2421

1529

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

2422

1530

seckey = arg;

2433

1541

}

2434

1542

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

2435

1543

break;

2436

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

2437

dh_params_file = arg;

2438

break;

2439

1544

case 130: /* --priority */

2440

1545

mc.priority = arg;

2441

1546

break;

2468

1573

argp_state_help(state, state->out_stream,

2469

1574

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2470

1575

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

2471

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

1576

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

1577

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

2472

1578

exit(argp_err_exit_status);

2473

1579

break;

2474

1580

default:

2481

1587

.args_doc = "",

2482

1588

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

2483

1589

" passwords from a Mandos server" };

2484

ret_errno = argp_parse(&argp, argc, argv,

2485

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2486

switch(ret_errno){

1590

ret = argp_parse(&argp, argc, argv,

1591

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1592

switch(ret){

2487

1593

case 0:

2488

1594

break;

2489

1595

case ENOMEM:

2490

1596

default:

2491

errno = ret_errno;

1597

errno = ret;

2492

1598

perror_plus("argp_parse");

2493

1599

exitcode = EX_OSERR;

2494

1600

goto end;

2497

1603

goto end;

2498

1604

}

2499

1605

}

2500

1606

2501

1607

{

2502

1608

/* Work around Debian bug #633582:

2503

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

2504

2505

/* Re-raise privileges */

2506

ret = raise_privileges();

2507

if(ret != 0){

2508

errno = ret;

2509

perror_plus("Failed to raise privileges");

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");

2510

1675

} else {

2511

struct stat st;

2512

2513

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

2514

int seckey_fd = open(seckey, O_RDONLY);

2515

if(seckey_fd == -1){

2516

perror_plus("open");

2517

} else {

2518

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

2519

if(ret == -1){

2520

perror_plus("fstat");

2521

} else {

2522

if(S_ISREG(st.st_mode)

2523

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

2524

ret = fchown(seckey_fd, uid, gid);

2525

if(ret == -1){

2526

perror_plus("fchown");

2527

}

2528

}

2529

}

2530

close(seckey_fd);

2531

}

2532

}

2533

2534

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

2535

int pubkey_fd = open(pubkey, O_RDONLY);

2536

if(pubkey_fd == -1){

2537

perror_plus("open");

2538

} else {

2539

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

2540

if(ret == -1){

2541

perror_plus("fstat");

2542

} else {

2543

if(S_ISREG(st.st_mode)

2544

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

2545

ret = fchown(pubkey_fd, uid, gid);

2546

if(ret == -1){

2547

perror_plus("fchown");

2548

}

2549

}

2550

}

2551

close(pubkey_fd);

2552

}

2553

}

2554

2555

if(dh_params_file != NULL

2556

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

2557

int dhparams_fd = open(dh_params_file, O_RDONLY);

2558

if(dhparams_fd == -1){

2559

perror_plus("open");

2560

} else {

2561

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

2562

if(ret == -1){

2563

perror_plus("fstat");

2564

} else {

2565

if(S_ISREG(st.st_mode)

2566

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

2567

ret = fchown(dhparams_fd, uid, gid);

2568

if(ret == -1){

2569

perror_plus("fchown");

2570

}

2571

}

2572

}

2573

close(dhparams_fd);

2574

}

2575

}

2576

2577

/* Lower privileges */

2578

ret = lower_privileges();

2579

if(ret != 0){

2580

errno = ret;

2581

perror_plus("Failed to lower privileges");

2582

}

2583

}

2584

}

2585

2586

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

2587

{

2588

char *interface = NULL;

2589

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

2590

interface))){

2591

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

2592

and if_nametoindex(interface) == 0){

2593

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

2594

fprintf_plus(stderr, "Not using nonexisting interface"

2595

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

2596

}

2597

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

2598

interface = NULL;

2599

}

2600

}

2601

}

2602

2603

/* Run network hooks */

2604

{

2605

if(mc.interfaces != NULL){

2606

interfaces_hooks = malloc(mc.interfaces_size);

2607

if(interfaces_hooks == NULL){

2608

perror_plus("malloc");

2609

goto end;

2610

}

2611

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

2612

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

2613

}

2614

run_network_hooks("start", interfaces_hooks != NULL ?

2615

interfaces_hooks : "", delay);

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("DEVICE", interface, 1);

1692

if(ret == -1){

1693

perror_plus("setenv");

1694

exit(1);

1695

}

1696

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

1697

if(ret == -1){

1698

perror_plus("setenv");

1699

exit(1);

1700

}

1701

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

1702

if(ret == -1){

1703

perror_plus("setenv");

1704

exit(1);

1705

}

1706

char *delaystring;

1707

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

1708

if(ret == -1){

1709

perror_plus("asprintf");

1710

exit(1);

1711

}

1712

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

1713

if(ret == -1){

1714

free(delaystring);

1715

perror_plus("setenv");

1716

exit(1);

1717

}

1718

free(delaystring);

1719

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

1720

perror_plus("execl");

1721

} else {

1722

int status;

1723

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

1724

perror_plus("waitpid");

1725

free(fullname);

1726

continue;

1727

}

1728

if(WIFEXITED(status)){

1729

if(WEXITSTATUS(status) != 0){

1730

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

1731

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

1732

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

1733

WEXITSTATUS(status));

1734

free(fullname);

1735

continue;

1736

}

1737

} else if(WIFSIGNALED(status)){

1738

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

1739

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

1740

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

1741

WTERMSIG(status));

1742

free(fullname);

1743

continue;

1744

} else {

1745

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

1746

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

1747

direntry->d_name);

1748

free(fullname);

1749

continue;

1750

}

1751

}

1752

free(fullname);

1753

if(quit_now){

1754

goto end;

1755

}

1756

}

1757

close(devnull);

1758

}

2616

1759

}

2617

1760

2618

1761

if(not debug){

2619

1762

avahi_set_log_function(empty_log);

2620

1763

}

2621

1764

1765

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

1766

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

if(ret >= 1){

1777

/* Pick the first interface returned */

1778

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

1779

if(debug){

1780

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

1781

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

1782

}

1783

if(interface == NULL){

1784

perror_plus("malloc");

1785

free(direntries);

1786

exitcode = EXIT_FAILURE;

1787

goto end;

1788

}

1789

free(direntries);

1790

} else {

1791

free(direntries);

1792

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

1793

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

1794

exitcode = EXIT_FAILURE;

1795

goto end;

1796

}

1797

}

1798

2622

1799

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

2623

1800

from the signal handler */

2624

1801

/* Initialize the pseudo-RNG for Avahi */

2625

1802

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

2626

simple_poll = avahi_simple_poll_new();

2627

if(simple_poll == NULL){

2628

fprintf_plus(stderr,

2629

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

1803

mc.simple_poll = avahi_simple_poll_new();

1804

if(mc.simple_poll == NULL){

1805

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

1806

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

2630

1807

exitcode = EX_UNAVAILABLE;

2631

1808

goto end;

2632

1809

}

2694

1871

}

2695

1872

}

2696

1873

2697

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

2698

if(mc.interfaces == NULL){

2699

struct dirent **direntries = NULL;

2700

/* Look for any good interfaces */

2701

ret = scandir(sys_class_net, &direntries, good_interface,

2702

alphasort);

2703

if(ret >= 1){

2704

/* Add all found interfaces to interfaces list */

2705

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

2706

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

2707

direntries[i]->d_name);

2708

if(ret_errno != 0){

2709

errno = ret_errno;

2710

perror_plus("argz_add");

2711

free(direntries[i]);

2712

continue;

2713

}

2714

if(debug){

2715

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

2716

direntries[i]->d_name);

2717

}

2718

free(direntries[i]);

2719

}

2720

free(direntries);

1874

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

1875

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

1876

if_index = (AvahiIfIndex) if_nametoindex(interface);

1877

if(if_index == 0){

1878

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

1879

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

1880

exitcode = EX_UNAVAILABLE;

1881

goto end;

1882

}

1883

1884

if(quit_now){

1885

goto end;

1886

}

1887

1888

/* Re-raise priviliges */

1889

errno = 0;

1890

ret = seteuid(0);

1891

if(ret == -1){

1892

perror_plus("seteuid");

1893

}

1894

1895

#ifdef __linux__

1896

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1897

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

1898

ret = klogctl(8, NULL, 5);

1899

bool restore_loglevel = true;

1900

if(ret == -1){

1901

restore_loglevel = false;

1902

perror_plus("klogctl");

1903

}

1904

#endif /* __linux__ */

1905

1906

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1907

if(sd < 0){

1908

perror_plus("socket");

1909

exitcode = EX_OSERR;

1910

#ifdef __linux__

1911

if(restore_loglevel){

1912

ret = klogctl(7, NULL, 0);

1913

if(ret == -1){

1914

perror_plus("klogctl");

1915

}

1916

}

1917

#endif /* __linux__ */

1918

/* Lower privileges */

1919

errno = 0;

1920

ret = seteuid(uid);

1921

if(ret == -1){

1922

perror_plus("seteuid");

1923

}

1924

goto end;

1925

}

1926

strcpy(network.ifr_name, interface);

1927

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

1928

if(ret == -1){

1929

perror_plus("ioctl SIOCGIFFLAGS");

1930

#ifdef __linux__

1931

if(restore_loglevel){

1932

ret = klogctl(7, NULL, 0);

1933

if(ret == -1){

1934

perror_plus("klogctl");

1935

}

1936

}

1937

#endif /* __linux__ */

1938

exitcode = EX_OSERR;

1939

/* Lower privileges */

1940

errno = 0;

1941

ret = seteuid(uid);

1942

if(ret == -1){

1943

perror_plus("seteuid");

1944

}

1945

goto end;

1946

}

1947

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

1948

network.ifr_flags |= IFF_UP;

1949

take_down_interface = true;

1950

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

1951

if(ret == -1){

1952

take_down_interface = false;

1953

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1954

exitcode = EX_OSERR;

1955

#ifdef __linux__

1956

if(restore_loglevel){

1957

ret = klogctl(7, NULL, 0);

1958

if(ret == -1){

1959

perror_plus("klogctl");

1960

}

1961

}

1962

#endif /* __linux__ */

1963

/* Lower privileges */

1964

errno = 0;

1965

ret = seteuid(uid);

1966

if(ret == -1){

1967

perror_plus("seteuid");

1968

}

1969

goto end;

1970

}

1971

}

1972

/* Sleep checking until interface is running.

1973

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

1974

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

1975

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

1976

if(ret == -1){

1977

perror_plus("ioctl SIOCGIFFLAGS");

1978

} else if(network.ifr_flags & IFF_RUNNING){

1979

break;

1980

}

1981

struct timespec sleeptime = { .tv_nsec = 250000000 };

1982

ret = nanosleep(&sleeptime, NULL);

1983

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

1984

perror_plus("nanosleep");

1985

}

1986

}

1987

if(not take_down_interface){

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("close");

1992

}

1993

}

1994

#ifdef __linux__

1995

if(restore_loglevel){

1996

/* Restores kernel loglevel to default */

1997

ret = klogctl(7, NULL, 0);

1998

if(ret == -1){

1999

perror_plus("klogctl");

2000

}

2001

}

2002

#endif /* __linux__ */

2003

/* Lower privileges */

2004

errno = 0;

2005

if(take_down_interface){

2006

/* Lower privileges */

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2010

}

2721

2011

} else {

2722

if(ret == 0){

2723

free(direntries);

2724

}

2725

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

2726

exitcode = EXIT_FAILURE;

2727

goto end;

2728

}

2729

}

2730

2731

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

2732

{

2733

char *interface = NULL;

2734

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

2735

interface))){

2736

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

2737

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

2738

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

2739

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

2740

interface);

2741

interface = NULL;

2742

while((interface = argz_next(mc.interfaces,

2743

mc.interfaces_size, interface))){

2744

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

2745

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

2746

interface);

2747

interface = NULL;

2748

}

2749

}

2750

break;

2751

}

2752

bool interface_was_up = interface_is_up(interface);

2753

errno = bring_up_interface(interface, delay);

2754

if(not interface_was_up){

2755

if(errno != 0){

2756

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

2757

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

2758

} else {

2759

errno = argz_add(&interfaces_to_take_down,

2760

&interfaces_to_take_down_size,

2761

interface);

2762

if(errno != 0){

2763

perror_plus("argz_add");

2764

}

2765

}

2766

}

2767

}

2768

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

2769

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

2770

}

2771

}

2772

2773

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

2774

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

2775

if(debug){

2776

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

2777

mc.interfaces);

2778

}

2779

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

2012

/* Lower privileges permanently */

2013

ret = setuid(uid);

2014

if(ret == -1){

2015

perror_plus("setuid");

2016

}

2017

}

2780

2018

}

2781

2019

2782

2020

if(quit_now){

2783

2021

goto end;

2784

2022

}

2785

2023

2786

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

2024

ret = init_gnutls_global(pubkey, seckey);

2787

2025

if(ret == -1){

2788

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

2026

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

2027

"init_gnutls_global failed\n");

2789

2028

exitcode = EX_UNAVAILABLE;

2790

2029

goto end;

2791

2030

} else {

2796

2035

goto end;

2797

2036

}

2798

2037

2799

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

2800

tempdir = mkdtemp(run_tempdir);

2801

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

2802

if(debug){

2803

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

2804

run_tempdir, old_tempdir);

2805

}

2806

tempdir = mkdtemp(old_tempdir);

2807

}

2808

if(tempdir == NULL){

2038

if(mkdtemp(tempdir) == NULL){

2809

2039

perror_plus("mkdtemp");

2810

2040

goto end;

2811

2041

}

2042

tempdir_created = true;

2812

2043

2813

2044

if(quit_now){

2814

2045

goto end;

2815

2046

}

2816

2047

2817

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

2818

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

2048

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

2049

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

2050

"init_gpgme failed\n");

2819

2051

exitcode = EX_UNAVAILABLE;

2820

2052

goto end;

2821

2053

} else {

2830

2062

/* Connect directly, do not use Zeroconf */

2831

2063

/* (Mainly meant for debugging) */

2832

2064

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

2833

2834

2065

if(address == NULL){

2835

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

2066

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

2067

"No colon in address\n");

2836

2068

exitcode = EX_USAGE;

2837

2069

goto end;

2838

2070

}

2841

2073

goto end;

2842

2074

}

2843

2075

2844

in_port_t port;

2076

uint16_t port;

2845

2077

errno = 0;

2846

2078

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

2847

2079

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

2848

or tmpmax != (in_port_t)tmpmax){

2849

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

2080

or tmpmax != (uint16_t)tmpmax){

2081

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

2082

"Bad port number\n");

2850

2083

exitcode = EX_USAGE;

2851

2084

goto end;

2852

2085

}

2853

2086

2854

2087

if(quit_now){

2855

2088

goto end;

2856

2089

}

2857

2090

2858

port = (in_port_t)tmpmax;

2091

port = (uint16_t)tmpmax;

2859

2092

*address = '\0';

2860

2093

/* Colon in address indicates IPv6 */

2861

2094

int af;

2877

2110

}

2878

2111

2879

2112

while(not quit_now){

2880

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

2881

&mc);

2113

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

2882

2114

if(quit_now or ret == 0){

2883

2115

break;

2884

2116

}

2885

2117

if(debug){

2886

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

2887

(int)retry_interval);

2118

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

2119

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

2888

2120

}

2889

sleep((unsigned int)retry_interval);

2121

sleep((int)retry_interval);

2890

2122

}

2891

2123

2892

if(not quit_now){

2124

if (not quit_now){

2893

2125

exitcode = EXIT_SUCCESS;

2894

2126

}

2895

2127

2910

2142

config.publish_domain = 0;

2911

2143

2912

2144

/* Allocate a new server */

2913

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2914

&config, NULL, NULL, &ret);

2145

mc.server = avahi_server_new(avahi_simple_poll_get

2146

(mc.simple_poll), &config, NULL,

2147

NULL, &error);

2915

2148

2916

2149

/* Free the Avahi configuration data */

2917

2150

avahi_server_config_free(&config);

2919

2152

2920

2153

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

2921

2154

if(mc.server == NULL){

2922

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

2923

avahi_strerror(ret));

2155

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

2156

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

2157

avahi_strerror(error));

2924

2158

exitcode = EX_UNAVAILABLE;

2925

2159

goto end;

2926

2160

}

2932

2166

/* Create the Avahi service browser */

2933

2167

sb = avahi_s_service_browser_new(mc.server, if_index,

2934

2168

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2935

NULL, 0, browse_callback,

2936

(void *)&mc);

2169

NULL, 0, browse_callback, NULL);

2937

2170

if(sb == NULL){

2938

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

2939

avahi_strerror(avahi_server_errno(mc.server)));

2171

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

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

2940

2174

exitcode = EX_UNAVAILABLE;

2941

2175

goto end;

2942

2176

}

2948

2182

/* Run the main loop */

2949

2183

2950

2184

if(debug){

2951

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

2185

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

2186

"Starting Avahi loop search\n");

2952

2187

}

2953

2954

ret = avahi_loop_with_timeout(simple_poll,

2955

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

2188

2189

ret = avahi_loop_with_timeout(mc.simple_poll,

2190

(int)(retry_interval * 1000));

2956

2191

if(debug){

2957

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

2958

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

2192

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

2193

"avahi_loop_with_timeout exited %s\n",

2194

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

2959

2195

}

2960

2196

2961

2197

end:

2962

2198

2963

2199

if(debug){

2964

if(signal_received){

2965

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

2966

argv[0], signal_received,

2967

strsignal(signal_received));

2968

} else {

2969

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

2970

}

2200

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

2201

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

2971

2202

}

2972

2203

2973

2204

/* Cleanup things */

2974

free(mc.interfaces);

2975

2976

2205

if(sb != NULL)

2977

2206

avahi_s_service_browser_free(sb);

2978

2207

2979

2208

if(mc.server != NULL)

2980

2209

avahi_server_free(mc.server);

2981

2210

2982

if(simple_poll != NULL)

2983

avahi_simple_poll_free(simple_poll);

2211

if(mc.simple_poll != NULL)

2212

avahi_simple_poll_free(mc.simple_poll);

2984

2213

2985

2214

if(gnutls_initialized){

2986

2215

gnutls_certificate_free_credentials(mc.cred);

2216

gnutls_global_deinit();

2987

2217

gnutls_dh_params_deinit(mc.dh_params);

2988

2218

}

2989

2219

2990

2220

if(gpgme_initialized){

2991

2221

gpgme_release(mc.ctx);

2992

2222

}

2993

2223

2994

2224

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

2995

2225

has seen */

2996

2226

if(mc.current_server != NULL){

2997

2227

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

2998

2228

while(mc.current_server != NULL){

2999

2229

server *next = mc.current_server->next;

3000

#ifdef __GNUC__

3001

#pragma GCC diagnostic push

3002

#pragma GCC diagnostic ignored "-Wcast-qual"

3003

#endif

3004

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

3005

#ifdef __GNUC__

3006

#pragma GCC diagnostic pop

3007

#endif

3008

2230

free(mc.current_server);

3009

2231

mc.current_server = next;

3010

2232

}

3011

2233

}

3012

2234

3013

/* Re-raise privileges */

3014

{

3015

ret = raise_privileges();

3016

if(ret != 0){

3017

errno = ret;

3018

perror_plus("Failed to raise privileges");

3019

} else {

3020

3021

/* Run network hooks */

3022

run_network_hooks("stop", interfaces_hooks != NULL ?

3023

interfaces_hooks : "", delay);

3024

3025

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

3026

{

3027

char *interface = NULL;

3028

while((interface = argz_next(interfaces_to_take_down,

3029

interfaces_to_take_down_size,

3030

interface))){

3031

ret = take_down_interface(interface);

3032

if(ret != 0){

3033

errno = ret;

3034

perror_plus("Failed to take down interface");

3035

}

3036

}

3037

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

3038

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

3039

" down\n");

3040

}

3041

}

2235

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

2236

2237

/* Take down the network interface */

2238

if(take_down_interface){

2239

/* Re-raise priviliges */

2240

errno = 0;

2241

ret = seteuid(0);

2242

if(ret == -1){

2243

perror_plus("seteuid");

3042

2244

}

3043

3044

ret = lower_privileges_permanently();

3045

if(ret != 0){

3046

errno = ret;

3047

perror_plus("Failed to lower privileges permanently");

2245

if(geteuid() == 0){

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCGIFFLAGS");

2249

} else if(network.ifr_flags & IFF_UP){

2250

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

2251

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

2252

if(ret == -1){

2253

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2254

}

2255

}

2256

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

2257

if(ret == -1){

2258

perror_plus("close");

2259

}

2260

/* Lower privileges permanently */

2261

errno = 0;

2262

ret = setuid(uid);

2263

if(ret == -1){

2264

perror_plus("setuid");

2265

}

3048

2266

}

3049

2267

}

3050

2268

3051

free(interfaces_to_take_down);

3052

free(interfaces_hooks);

3053

3054

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

3055

uintmax_t level){

2269

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

2270

if(tempdir_created){

3056

2271

struct dirent **direntries = NULL;

3057

int dret;

3058

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

3059

O_RDONLY

3060

| O_NOFOLLOW

3061

| O_DIRECTORY

3062

| O_PATH));

3063

if(dir_fd == -1){

3064

perror_plus("open");

3065

return;

3066

}

3067

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

3068

notdotentries, alphasort);

3069

if(numentries >= 0){

2272

struct dirent *direntry = NULL;

2273

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

2274

alphasort);

2275

if (numentries > 0){

3070

2276

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

3071

if(debug){

3072

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

3073

dirname, direntries[i]->d_name);

3074

}

3075

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

3076

if(dret == -1){

3077

if(errno == EISDIR){

3078

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

3079

AT_REMOVEDIR);

3080

}

3081

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

3082

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

3083

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

3084

/* Recurse only in this special case */

3085

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

3086

dret = 0;

3087

}

3088

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

3089

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

3090

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

3091

}

3092

}

3093

free(direntries[i]);

3094

}

3095

3096

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

3097

free(direntries);

3098

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3099

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

3100

perror_plus("rmdir");

3101

}

3102

} else {

3103

perror_plus("scandirat");

3104

}

3105

close(dir_fd);

3106

}

3107

3108

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

3109

if(tempdir != NULL){

3110

clean_dir_at(-1, tempdir, 0);

2277

direntry = direntries[i];

2278

char *fullname = NULL;

2279

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

2280

direntry->d_name);

2281

if(ret < 0){

2282

perror_plus("asprintf");

2283

continue;

2284

}

2285

ret = remove(fullname);

2286

if(ret == -1){

2287

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

2288

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

2289

}

2290

free(fullname);

2291

}

2292

}

2293

2294

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

2295

free(direntries);

2296

if (numentries == -1){

2297

perror_plus("scandir");

2298

}

2299

ret = rmdir(tempdir);

2300

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

2301

perror_plus("rmdir");

2302

}

3111

2303

}

3112

2304

3113

2305

if(quit_now){