/mandos/release : revision 237.7.486

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

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*

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* Everything else is

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*

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

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

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

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

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*

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

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*

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* This file is part of Mandos.

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*

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

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

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

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* (at your option) any later version.

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*

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

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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

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* General Public License for more details.

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*

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

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* along with this program. If not, see

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

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

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*

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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

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stdout, ferror(), remove() */

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

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stdout, ferror() */

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

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

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

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strtof(), abort() */

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

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

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

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

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asprintf(), strncpy(), strsignal()

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*/

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

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

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

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

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

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

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

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*/

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

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strtoimax() */

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

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

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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

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

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*/

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

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

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setgid(), pause() */

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

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

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unlinkat() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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184

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/* Function to use when printing errors */

168

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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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208

*/

209

__attribute__((nonnull, warn_unused_result))

179

210

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

211

size_t buffer_capacity){

181

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

182

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

183

if(buffer == NULL){

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

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if(new_buf == NULL){

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int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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222

buffer_capacity += BUFFER_SIZE;

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223

}

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return buffer_capacity;

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}

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226

191

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

192

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

228

__attribute__((nonnull, warn_unused_result))

229

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

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int af, server **current_server){

195

231

int ret;

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232

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

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if(new_server == NULL){

198

234

perror_plus("malloc");

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return -1;

235

return false;

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}

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237

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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free(new_server);

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return false;

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}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

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#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

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#ifdef __GNUC__

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#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

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return false;

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}

209

260

/* Special case of first server */

210

if (mc.current_server == NULL){

261

if(*current_server == NULL){

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262

new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

215

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} else {

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new_server->next = mc.current_server;

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

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

223

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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(*current_server)->prev = new_server;

271

}

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return true;

227

273

}

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274

229

275

/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

278

__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

236

285

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/*

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

240

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*/

241

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

242

290

int ret;

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int fd;

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gpgme_data_t pgp_data;

251

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

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if(rc != GPG_ERR_NO_ERROR){

254

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

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gpgme_strsource(rc), gpgme_strerror(rc));

302

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

257

305

}

258

306

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rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

260

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if(rc != GPG_ERR_NO_ERROR){

261

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

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gpgme_strsource(rc), gpgme_strerror(rc));

309

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

264

312

}

265

313

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

314

ret = close(fd);

267

315

if(ret == -1){

268

316

perror_plus("close");

269

317

}

272

320

}

273

321

274

322

if(debug){

275

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

323

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

276

324

}

277

325

278

326

/* Init GPGME */

279

327

gpgme_check_version(NULL);

280

328

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

329

if(rc != GPG_ERR_NO_ERROR){

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

330

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

331

gpgme_strsource(rc), gpgme_strerror(rc));

284

332

return false;

285

333

}

286

334

287

335

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

288

336

rc = gpgme_get_engine_info(&engine_info);

289

337

if(rc != GPG_ERR_NO_ERROR){

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

292

340

return false;

293

341

}

294

342

while(engine_info != NULL){

300

348

engine_info = engine_info->next;

301

349

}

302

350

if(engine_info == NULL){

303

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

351

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

352

tempdir);

304

353

return false;

305

354

}

306

355

307

356

/* Create new GPGME "context" */

308

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

357

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

309

358

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

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

361

gpgme_strerror(rc));

312

362

return false;

313

363

}

314

364

323

373

* Decrypt OpenPGP data.

324

374

* Returns -1 on error

325

375

*/

376

__attribute__((nonnull, warn_unused_result))

326

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

327

378

size_t crypto_size,

328

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

329

381

gpgme_data_t dh_crypto, dh_plain;

330

382

gpgme_error_t rc;

331

383

ssize_t ret;

333

385

ssize_t plaintext_length = 0;

334

386

335

387

if(debug){

336

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

388

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

337

389

}

338

390

339

391

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

340

392

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

393

0);

342

394

if(rc != GPG_ERR_NO_ERROR){

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

395

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

396

gpgme_strsource(rc), gpgme_strerror(rc));

345

397

return -1;

346

398

}

347

399

348

400

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

349

401

rc = gpgme_data_new(&dh_plain);

350

402

if(rc != GPG_ERR_NO_ERROR){

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

403

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

404

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

405

gpgme_strsource(rc), gpgme_strerror(rc));

353

406

gpgme_data_release(dh_crypto);

354

407

return -1;

355

408

}

356

409

357

410

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

358

411

data buffer */

359

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

412

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

360

413

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

363

416

plaintext_length = -1;

364

417

if(debug){

365

418

gpgme_decrypt_result_t result;

366

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

367

420

if(result == NULL){

368

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

421

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

369

422

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

423

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

424

result->unsupported_algorithm);

425

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

426

result->wrong_key_usage);

374

427

if(result->file_name != NULL){

375

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

428

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

376

429

}

377

430

gpgme_recipient_t recipient;

378

431

recipient = result->recipients;

379

432

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

433

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

434

gpgme_pubkey_algo_name

435

(recipient->pubkey_algo));

436

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

437

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

438

recipient->status == GPG_ERR_NO_SECKEY

439

? "No" : "Yes");

386

440

recipient = recipient->next;

387

441

}

388

442

}

391

445

}

392

446

393

447

if(debug){

394

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

448

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

395

449

}

396

450

397

451

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

404

458

*plaintext = NULL;

405

459

while(true){

406

460

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

461

(size_t)plaintext_length,

462

plaintext_capacity);

409

463

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

464

perror_plus("incbuffer");

465

plaintext_length = -1;

466

goto decrypt_end;

413

467

}

414

468

415

469

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

482

}

429

483

430

484

if(debug){

431

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

485

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

432

486

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

433

487

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

434

488

}

445

499

return plaintext_length;

446

500

}

447

501

448

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

451

if(ret == NULL)

452

ret = "(unknown)";

453

return ret;

502

__attribute__((warn_unused_result, const))

503

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

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

509

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

511

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

454

513

}

455

514

456

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

457

517

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

458

518

const char* string){

459

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

519

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

460

520

}

461

521

522

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

462

523

static int init_gnutls_global(const char *pubkeyfilename,

463

const char *seckeyfilename){

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

464

527

int ret;

528

unsigned int uret;

465

529

466

530

if(debug){

467

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

468

}

469

470

ret = gnutls_global_init();

471

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

474

return -1;

531

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

475

532

}

476

533

477

534

if(debug){

483

540

}

484

541

485

542

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

487

544

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

490

gnutls_global_deinit();

545

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

546

safer_gnutls_strerror(ret));

491

547

return -1;

492

548

}

493

549

494

550

if(debug){

495

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

496

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

497

seckeyfilename);

551

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

552

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

553

pubkeyfilename,

554

seckeyfilename);

498

555

}

499

556

500

557

ret = gnutls_certificate_set_openpgp_key_file

501

(mc.cred, pubkeyfilename, seckeyfilename,

558

(mc->cred, pubkeyfilename, seckeyfilename,

502

559

GNUTLS_OPENPGP_FMT_BASE64);

503

560

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

561

fprintf_plus(stderr,

562

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

563

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

564

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

565

safer_gnutls_strerror(ret));

509

566

goto globalfail;

510

567

}

511

568

512

569

/* GnuTLS server initialization */

513

ret = gnutls_dh_params_init(&mc.dh_params);

514

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

517

goto globalfail;

518

}

519

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

520

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

523

goto globalfail;

524

}

525

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

ret = gnutls_dh_params_init(&mc->dh_params);

571

if(ret != GNUTLS_E_SUCCESS){

572

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

573

" initialization: %s\n",

574

safer_gnutls_strerror(ret));

575

goto globalfail;

576

}

577

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

578

if(dhparamsfilename != NULL){

579

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

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

588

while(true){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

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

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

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

626

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

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

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

636

/* Try to read the private key file */

637

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

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

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

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

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

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

679

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

682

safer_gnutls_strerror(ret));

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

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

688

if(ret != GNUTLS_E_SUCCESS){

689

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

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

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

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

707

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

717

}

718

}

719

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

723

if(debug){

724

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

725

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

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

729

}

730

} else {

731

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

732

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

733

safe_string(gnutls_sec_param_get_name

734

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

737

}

738

} else if(debug){

739

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

740

mc->dh_bits);

741

}

742

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

743

if(ret != GNUTLS_E_SUCCESS){

744

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

745

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

746

safer_gnutls_strerror(ret));

747

goto globalfail;

748

}

749

}

750

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

527

751

528

752

return 0;

529

753

530

754

globalfail:

531

755

532

gnutls_certificate_free_credentials(mc.cred);

533

gnutls_global_deinit();

534

gnutls_dh_params_deinit(mc.dh_params);

756

gnutls_certificate_free_credentials(mc->cred);

757

gnutls_dh_params_deinit(mc->dh_params);

535

758

return -1;

536

759

}

537

760

538

static int init_gnutls_session(gnutls_session_t *session){

761

__attribute__((nonnull, warn_unused_result))

762

static int init_gnutls_session(gnutls_session_t *session,

763

mandos_context *mc){

539

764

int ret;

540

765

/* GnuTLS session creation */

541

766

do {

545

770

}

546

771

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

547

772

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

773

fprintf_plus(stderr,

774

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

775

safer_gnutls_strerror(ret));

550

776

}

551

777

552

778

{

553

779

const char *err;

554

780

do {

555

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

781

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

556

782

if(quit_now){

557

783

gnutls_deinit(*session);

558

784

return -1;

559

785

}

560

786

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

561

787

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

788

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

789

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

790

safer_gnutls_strerror(ret));

565

791

gnutls_deinit(*session);

566

792

return -1;

567

793

}

569

795

570

796

do {

571

797

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

798

mc->cred);

573

799

if(quit_now){

574

800

gnutls_deinit(*session);

575

801

return -1;

576

802

}

577

803

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

578

804

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

805

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

806

safer_gnutls_strerror(ret));

581

807

gnutls_deinit(*session);

582

808

return -1;

583

809

}

585

811

/* ignore client certificate if any. */

586

812

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

587

813

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

589

590

814

return 0;

591

815

}

592

816

594

818

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

595

819

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

596

820

821

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

822

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

826

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

827

ret = errno;

828

}

829

errno = old_errno;

830

return ret;

831

}

832

833

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

834

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

839

errno = old_errno;

840

return ret;

841

}

842

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

843

ret = errno;

844

}

845

errno = old_errno;

846

return ret;

847

}

848

849

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

850

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

854

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

855

ret = errno;

856

}

857

errno = old_errno;

858

return ret;

859

}

860

861

/* Lower privileges permanently */

862

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

866

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

867

ret = errno;

868

}

869

errno = old_errno;

870

return ret;

871

}

872

873

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

874

__attribute__((nonnull, warn_unused_result))

875

static bool add_delete_local_route(const bool add,

876

const char *address,

877

AvahiIfIndex if_index){

878

int ret;

879

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

880

char add_arg[] = "add";

881

char delete_arg[] = "delete";

882

char debug_flag[] = "--debug";

883

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

884

if(pluginhelperdir == NULL){

885

if(debug){

886

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

887

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

888

}

889

return false;

890

}

891

892

char interface[IF_NAMESIZE];

893

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

894

perror_plus("if_indextoname");

895

return false;

896

}

897

898

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

899

if(devnull == -1){

900

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

901

return false;

902

}

903

pid_t pid = fork();

904

if(pid == 0){

905

/* Child */

906

/* Raise privileges */

907

errno = raise_privileges_permanently();

908

if(errno != 0){

909

perror_plus("Failed to raise privileges");

910

/* _exit(EX_NOPERM); */

911

} else {

912

/* Set group */

913

errno = 0;

914

ret = setgid(0);

915

if(ret == -1){

916

perror_plus("setgid");

917

_exit(EX_NOPERM);

918

}

919

/* Reset supplementary groups */

920

errno = 0;

921

ret = setgroups(0, NULL);

922

if(ret == -1){

923

perror_plus("setgroups");

924

_exit(EX_NOPERM);

925

}

926

}

927

ret = dup2(devnull, STDIN_FILENO);

928

if(ret == -1){

929

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

930

_exit(EX_OSERR);

931

}

932

ret = close(devnull);

933

if(ret == -1){

934

perror_plus("close");

935

_exit(EX_OSERR);

936

}

937

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

938

if(ret == -1){

939

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

940

_exit(EX_OSERR);

941

}

942

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

943

O_RDONLY

944

| O_DIRECTORY

945

| O_PATH

946

| O_CLOEXEC));

947

if(helperdir_fd == -1){

948

perror_plus("open");

949

_exit(EX_UNAVAILABLE);

950

}

951

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

952

helper, O_RDONLY));

953

if(helper_fd == -1){

954

perror_plus("openat");

955

close(helperdir_fd);

956

_exit(EX_UNAVAILABLE);

957

}

958

close(helperdir_fd);

959

#ifdef __GNUC__

960

#pragma GCC diagnostic push

961

#pragma GCC diagnostic ignored "-Wcast-qual"

962

#endif

963

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

964

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

965

interface, debug ? debug_flag : NULL, NULL },

966

environ) == -1){

967

#ifdef __GNUC__

968

#pragma GCC diagnostic pop

969

#endif

970

perror_plus("fexecve");

971

_exit(EXIT_FAILURE);

972

}

973

}

974

if(pid == -1){

975

perror_plus("fork");

976

return false;

977

}

978

int status;

979

pid_t pret = -1;

980

errno = 0;

981

do {

982

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

983

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

984

int errno_raising = 0;

985

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

986

errno_raising = errno;

987

perror_plus("Failed to raise privileges in order to"

988

" kill helper program");

989

}

990

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

991

perror_plus("kill");

992

}

993

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

994

perror_plus("Failed to lower privileges after killing"

995

" helper program");

996

}

997

return false;

998

}

999

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

1000

if(pret == -1){

1001

perror_plus("waitpid");

1002

return false;

1003

}

1004

if(WIFEXITED(status)){

1005

if(WEXITSTATUS(status) != 0){

1006

fprintf_plus(stderr, "Error: iprouteadddel exited"

1007

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

1008

return false;

1009

}

1010

return true;

1011

}

1012

if(WIFSIGNALED(status)){

1013

fprintf_plus(stderr, "Error: iprouteadddel died by"

1014

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

1015

return false;

1016

}

1017

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

1018

return false;

1019

}

1020

1021

__attribute__((nonnull, warn_unused_result))

1022

static bool add_local_route(const char *address,

1023

AvahiIfIndex if_index){

1024

if(debug){

1025

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

1026

}

1027

return add_delete_local_route(true, address, if_index);

1028

}

1029

1030

__attribute__((nonnull, warn_unused_result))

1031

static bool delete_local_route(const char *address,

1032

AvahiIfIndex if_index){

1033

if(debug){

1034

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

1035

}

1036

return add_delete_local_route(false, address, if_index);

1037

}

1038

597

1039

/* Called when a Mandos server is found */

598

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

1040

__attribute__((nonnull, warn_unused_result))

1041

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

599

1042

AvahiIfIndex if_index,

600

int af){

1043

int af, mandos_context *mc){

601

1044

int ret, tcp_sd = -1;

602

1045

ssize_t sret;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

1046

struct sockaddr_storage to;

607

1047

char *buffer = NULL;

608

1048

char *decrypted_buffer = NULL;

609

1049

size_t buffer_length = 0;

612

1052

int retval = -1;

613

1053

gnutls_session_t session;

614

1054

int pf; /* Protocol family */

1055

bool route_added = false;

615

1056

616

1057

errno = 0;

617

1058

628

1069

pf = PF_INET;

629

1070

break;

630

1071

default:

631

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

1072

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

632

1073

errno = EINVAL;

633

1074

return -1;

634

1075

}

635

1076

636

ret = init_gnutls_session(&session);

1077

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

1078

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

1079

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

1080

bool match = false;

1081

{

1082

char *interface = NULL;

1083

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

1084

mc->interfaces_size,

1085

interface))){

1086

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

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

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

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

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

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

637

1111

if(ret != 0){

638

1112

return -1;

639

1113

}

640

1114

641

1115

if(debug){

642

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

643

"\n", ip, port);

1116

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

1117

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

644

1118

}

645

1119

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

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

647

1121

if(tcp_sd < 0){

648

1122

int e = errno;

649

1123

perror_plus("socket");

656

1130

goto mandos_end;

657

1131

}

658

1132

659

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

660

1133

if(af == AF_INET6){

661

to.in6.sin6_family = (sa_family_t)af;

662

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

1134

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

1135

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

1136

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

663

1137

} else { /* IPv4 */

664

to.in.sin_family = (sa_family_t)af;

665

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

1138

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

1139

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

1140

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

666

1141

}

667

1142

if(ret < 0 ){

668

1143

int e = errno;

672

1147

}

673

1148

if(ret == 0){

674

1149

int e = errno;

675

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

1150

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

676

1151

errno = e;

677

1152

goto mandos_end;

678

1153

}

679

1154

if(af == AF_INET6){

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

687

1158

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

1159

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

1160

" incomplete without a network interface\n");

690

1161

errno = EINVAL;

691

1162

goto mandos_end;

692

1163

}

693

1164

/* Set the network interface number as scope */

694

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

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

695

1166

}

696

1167

} else {

697

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

698

-Wconversion and

699

-Wunreachable-code */

1168

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

700

1169

}

701

1170

702

1171

if(quit_now){

710

1179

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

711

1180

perror_plus("if_indextoname");

712

1181

} else {

713

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

714

ip, interface, port);

1182

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

1183

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

715

1184

}

716

1185

} else {

717

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

718

port);

1186

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

1187

ip, (uintmax_t)port);

719

1188

}

720

1189

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

1190

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

722

const char *pcret;

723

if(af == AF_INET6){

724

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

725

sizeof(addrstr));

726

} else {

727

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

728

sizeof(addrstr));

729

}

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

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

734

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

735

}

736

}

737

}

738

739

if(quit_now){

740

errno = EINTR;

741

goto mandos_end;

742

}

743

744

if(af == AF_INET6){

745

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

746

} else {

747

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

748

}

749

if(ret < 0){

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

755

goto mandos_end;

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

1191

if(af == AF_INET6){

1192

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

1193

sizeof(struct sockaddr_in6),

1194

addrstr, sizeof(addrstr), NULL, 0,

1195

NI_NUMERICHOST);

1196

} else {

1197

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

1198

sizeof(struct sockaddr_in),

1199

addrstr, sizeof(addrstr), NULL, 0,

1200

NI_NUMERICHOST);

1201

}

1202

if(ret == EAI_SYSTEM){

1203

perror_plus("getnameinfo");

1204

} else if(ret != 0) {

1205

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

1206

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

1207

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

1208

}

1209

}

1210

1211

if(quit_now){

1212

errno = EINTR;

1213

goto mandos_end;

1214

}

1215

1216

while(true){

1217

if(af == AF_INET6){

1218

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

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

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

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

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

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

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

1235

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

1236

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

1237

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

1238

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

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

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

1242

1243

Avahi bug reference:

1244

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

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

761

1271

}

762

1272

763

1273

const char *out = mandos_protocol_version;

765

1275

while(true){

766

1276

size_t out_size = strlen(out);

767

1277

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

768

out_size - written));

1278

out_size - written));

769

1279

if(ret == -1){

770

1280

int e = errno;

771

1281

perror_plus("write");

791

1301

}

792

1302

793

1303

if(debug){

794

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

1304

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

795

1305

}

796

1306

797

1307

if(quit_now){

799

1309

goto mandos_end;

800

1310

}

801

1311

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1312

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

1313

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

1314

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

1315

gnutls_transport_set_ptr(session,

1316

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

1317

805

1318

if(quit_now){

806

1319

errno = EINTR;

817

1330

818

1331

if(ret != GNUTLS_E_SUCCESS){

819

1332

if(debug){

820

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

1333

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

821

1334

gnutls_perror(ret);

822

1335

}

823

1336

errno = EPROTO;

827

1340

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

828

1341

829

1342

if(debug){

830

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

831

ip);

1343

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1344

" %s\n", ip);

832

1345

}

833

1346

834

1347

while(true){

839

1352

}

840

1353

841

1354

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

1355

buffer_capacity);

843

1356

if(buffer_capacity == 0){

844

1357

int e = errno;

845

1358

perror_plus("incbuffer");

872

1385

}

873

1386

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

874

1387

if(ret < 0){

875

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

1388

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

1389

"***\n");

876

1390

gnutls_perror(ret);

877

1391

errno = EPROTO;

878

1392

goto mandos_end;

879

1393

}

880

1394

break;

881

1395

default:

882

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

883

" encrypted session with Mandos server\n");

1396

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

1397

" encrypted session with Mandos server\n");

884

1398

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

1399

errno = EIO;

886

1400

goto mandos_end;

891

1405

}

892

1406

893

1407

if(debug){

894

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

1408

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

895

1409

}

896

1410

897

1411

if(quit_now){

909

1423

910

1424

if(buffer_length > 0){

911

1425

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

1426

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1427

&decrypted_buffer, mc);

915

1428

if(decrypted_buffer_size >= 0){

916

1429

1430

clearerr(stdout);

917

1431

written = 0;

918

1432

while(written < (size_t) decrypted_buffer_size){

919

1433

if(quit_now){

927

1441

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

928

1442

int e = errno;

929

1443

if(debug){

930

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

931

strerror(errno));

1444

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

1445

strerror(errno));

932

1446

}

933

1447

errno = e;

934

1448

goto mandos_end;

935

1449

}

936

1450

written += (size_t)ret;

937

1451

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

938

1462

retval = 0;

939

1463

}

940

1464

}

943

1467

944

1468

mandos_end:

945

1469

{

1470

if(route_added){

1471

if(not delete_local_route(ip, if_index)){

1472

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

1473

" interface %d", ip, if_index);

1474

}

1475

}

946

1476

int e = errno;

947

1477

free(decrypted_buffer);

948

1478

free(buffer);

949

1479

if(tcp_sd >= 0){

950

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

1480

ret = close(tcp_sd);

951

1481

}

952

1482

if(ret == -1){

953

1483

if(e == 0){

978

1508

AVAHI_GCC_UNUSED AvahiStringList *txt,

979

1509

AVAHI_GCC_UNUSED AvahiLookupResultFlags

980

1510

flags,

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

983

1515

984

1516

/* Called whenever a service has been resolved successfully or

985

1517

timed out */

986

1518

987

1519

if(quit_now){

1520

avahi_s_service_resolver_free(r);

988

1521

return;

989

1522

}

990

1523

991

1524

switch(event){

992

1525

default:

993

1526

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1527

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

1528

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

1529

domain,

1530

avahi_strerror(avahi_server_errno

1531

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

997

1532

break;

998

1533

999

1534

case AVAHI_RESOLVER_FOUND:

1001

1536

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1537

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

1003

1538

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1539

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

1540

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

1541

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

1007

1542

}

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

1010

1547

if(ret == 0){

1011

avahi_simple_poll_quit(mc.simple_poll);

1548

avahi_simple_poll_quit(simple_poll);

1012

1549

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1550

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

1551

avahi_proto_to_af(proto),

1552

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

1553

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

1554

" list\n", name);

1555

}

1015

1556

}

1016

1557

}

1017

1558

}

1027

1568

const char *domain,

1028

1569

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1029

1570

flags,

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

1032

1575

1033

1576

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

1034

1577

is removed from the LAN */

1041

1584

default:

1042

1585

case AVAHI_BROWSER_FAILURE:

1043

1586

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1587

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

1588

avahi_strerror(avahi_server_errno

1589

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

1590

avahi_simple_poll_quit(simple_poll);

1047

1591

return;

1048

1592

1049

1593

case AVAHI_BROWSER_NEW:

1052

1596

the callback function is called the Avahi server will free the

1053

1597

resolver for us. */

1054

1598

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1599

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

1600

interface, protocol, name, type,

1601

domain, protocol, 0,

1602

resolve_callback, mc) == NULL)

1603

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

1604

" %s\n", name,

1605

avahi_strerror(avahi_server_errno

1606

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

1060

1607

break;

1061

1608

1062

1609

case AVAHI_BROWSER_REMOVE:

1065

1612

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1613

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1614

if(debug){

1068

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

1615

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

1616

" searching...\n");

1069

1617

}

1070

1618

break;

1071

1619

}

1080

1628

signal_received = sig;

1081

1629

int old_errno = errno;

1082

1630

/* set main loop to exit */

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1085

1633

}

1086

1634

errno = old_errno;

1087

1635

}

1088

1636

1637

__attribute__((nonnull, warn_unused_result))

1089

1638

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

1090

1639

int ret;

1640

int old_errno;

1091

1641

1092

1642

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

1093

1643

if(s < 0){

1644

old_errno = errno;

1094

1645

perror_plus("socket");

1646

errno = old_errno;

1095

1647

return false;

1096

1648

}

1097

strcpy(ifr->ifr_name, ifname);

1649

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

1650

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

1098

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

1652

if(ret == -1){

1100

1653

if(debug){

1654

old_errno = errno;

1101

1655

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1102

1657

}

1103

1658

return false;

1104

1659

}

1105

1660

return true;

1106

1661

}

1107

1662

1663

__attribute__((nonnull, warn_unused_result))

1108

1664

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

1109

1665

1110

1666

/* Reject the loopback device */

1111

1667

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1668

if(debug){

1113

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

1114

ifname);

1669

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

1670

ifname);

1115

1671

}

1116

1672

return false;

1117

1673

}

1118

1674

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

1119

1675

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

1120

1676

if(debug){

1121

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

1122

ifname);

1677

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

1678

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

1123

1679

}

1124

1680

return true;

1125

1681

}

1126

1682

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

1127

1683

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

1128

1684

if(debug){

1129

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

1130

ifname);

1685

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1686

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

1131

1687

}

1132

1688

return false;

1133

1689

}

1134

1690

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

1135

1691

if(ifr->ifr_flags & IFF_NOARP){

1136

1692

if(debug){

1137

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

1693

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

1694

ifname);

1138

1695

}

1139

1696

return false;

1140

1697

}

1141

1698

1142

1699

/* Accept this device */

1143

1700

if(debug){

1144

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

1701

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

1145

1702

}

1146

1703

return true;

1147

1704

}

1151

1708

* corresponds to an acceptable network device.

1152

1709

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

1153

1710

*/

1711

__attribute__((nonnull, warn_unused_result))

1154

1712

int good_interface(const struct dirent *if_entry){

1155

1713

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

1156

1714

return 0;

1159

1717

struct ifreq ifr;

1160

1718

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

1161

1719

if(debug){

1162

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

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

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))

1217

1767

int notdotentries(const struct dirent *direntry){

1218

1768

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

1219

1769

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

1226

1776

}

1227

1777

1228

1778

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

1779

__attribute__((nonnull, warn_unused_result))

1229

1780

int runnable_hook(const struct dirent *direntry){

1230

1781

int ret;

1782

size_t sret;

1231

1783

struct stat st;

1232

1784

1233

1785

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

1235

1787

return 0;

1236

1788

}

1237

1789

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1790

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

1791

"abcdefghijklmnopqrstuvwxyz"

1792

"0123456789"

1793

"_.-");

1794

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

1795

/* Contains non-allowed characters */

1796

if(debug){

1797

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

1798

direntry->d_name);

1799

}

1800

return 0;

1801

}

1802

1803

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

1255

1804

if(ret == -1){

1256

1805

if(debug){

1257

perror_plus("Could not stat plugin");

1806

perror_plus("Could not stat hook");

1258

1807

}

1259

1808

return 0;

1260

1809

}

1261

1810

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

1262

1811

/* Not a regular file */

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1263

1816

return 0;

1264

1817

}

1265

1818

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

1266

1819

/* Not executable */

1820

if(debug){

1821

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

1822

direntry->d_name);

1823

}

1267

1824

return 0;

1268

1825

}

1826

if(debug){

1827

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

1828

direntry->d_name);

1829

}

1269

1830

return 1;

1270

1831

}

1271

1832

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1273

1836

int ret;

1274

1837

struct timespec now;

1275

1838

struct timespec waited_time;

1276

1839

intmax_t block_time;

1277

1840

1278

1841

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1842

if(mc->current_server == NULL){

1843

if(debug){

1844

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

1845

" No timeout!\n");

1283

1846

}

1284

1847

ret = avahi_simple_poll_iterate(s, -1);

1285

1848

} else {

1286

if (debug){

1287

fprintf(stderr, "Check current_server if we should run it,"

1288

" or wait\n");

1849

if(debug){

1850

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

1851

" it, or wait\n");

1289

1852

}

1290

1853

/* the current time */

1291

1854

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1296

1859

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

1297

1860

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

1298

1861

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1862

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

1300

1863

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1864

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

1302

1865

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

1303

1866

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

1304

1867

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

1306

1869

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

1307

1870

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

1308

1871

1309

if (debug){

1310

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

1872

if(debug){

1873

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

1874

block_time);

1311

1875

}

1312

1876

1313

1877

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1878

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

1879

mc->current_server->port,

1880

mc->current_server->if_index,

1881

mc->current_server->af, mc);

1318

1882

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1883

avahi_simple_poll_quit(s);

1320

1884

return 0;

1321

1885

}

1322

1886

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1887

&mc->current_server->last_seen);

1324

1888

if(ret == -1){

1325

1889

perror_plus("clock_gettime");

1326

1890

return -1;

1327

1891

}

1328

mc.current_server = mc.current_server->next;

1892

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

1329

1893

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

1330

1894

servers, but don't block */

1331

1895

}

1333

1897

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

1334

1898

}

1335

1899

if(ret != 0){

1336

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

1900

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

1337

1901

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

1338

1902

}

1339

1903

}

1340

1904

}

1341

1905

}

1342

1906

1907

__attribute__((nonnull))

1908

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

1909

const float delay){

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

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

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

int 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

1343

2292

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 };

1344

2298

AvahiSServiceBrowser *sb = NULL;

1345

int error;

2299

error_t ret_errno;

1346

2300

int ret;

1347

2301

intmax_t tmpmax;

1348

2302

char *tmp;

1349

2303

int exitcode = EXIT_SUCCESS;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1356

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

1357

bool tempdir_created = false;

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;

1358

2309

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1359

2310

const char *seckey = PATHDIR "/" SECKEY;

1360

2311

const char *pubkey = PATHDIR "/" PUBKEY;

2312

const char *dh_params_file = NULL;

2313

char *interfaces_hooks = NULL;

1361

2314

1362

2315

bool gnutls_initialized = false;

1363

2316

bool gpgme_initialized = false;

1415

2368

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

1416

2369

" Diffie-Hellman key exchange",

1417

2370

.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 },

1418

2376

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

1419

2377

.arg = "STRING",

1420

2378

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

1425

2383

.group = 2 },

1426

2384

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

1427

2385

.arg = "SECONDS",

1428

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

2386

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

2387

.group = 2 },

2388

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

2389

.arg = "DIR",

2390

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

1429

2391

.group = 2 },

1430

2392

/*

1431

2393

* These reproduce what we would get without ARGP_NO_HELP

1450

2412

connect_to = arg;

1451

2413

break;

1452

2414

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

1453

interface = arg;

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

}

1454

2420

break;

1455

2421

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

1456

2422

seckey = arg;

1467

2433

}

1468

2434

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

1469

2435

break;

2436

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

2437

dh_params_file = arg;

2438

break;

1470

2439

case 130: /* --priority */

1471

2440

mc.priority = arg;

1472

2441

break;

1485

2454

argp_error(state, "Bad retry interval");

1486

2455

}

1487

2456

break;

2457

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

2458

hookdir = arg;

2459

break;

1488

2460

/*

1489

2461

* These reproduce what we would get without ARGP_NO_HELP

1490

2462

*/

1496

2468

argp_state_help(state, state->out_stream,

1497

2469

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

2470

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

1499

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

2471

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

1500

2472

exit(argp_err_exit_status);

1501

2473

break;

1502

2474

default:

1509

2481

.args_doc = "",

1510

2482

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

1511

2483

" passwords from a Mandos server" };

1512

ret = argp_parse(&argp, argc, argv,

1513

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1514

switch(ret){

2484

ret_errno = argp_parse(&argp, argc, argv,

2485

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2486

switch(ret_errno){

1515

2487

case 0:

1516

2488

break;

1517

2489

case ENOMEM:

1518

2490

default:

1519

errno = ret;

2491

errno = ret_errno;

1520

2492

perror_plus("argp_parse");

1521

2493

exitcode = EX_OSERR;

1522

2494

goto end;

1525

2497

goto end;

1526

2498

}

1527

2499

}

1528

2500

1529

2501

{

1530

2502

/* Work around Debian bug #633582:

1531

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

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

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");

2510

} 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");

1644

2609

goto end;

1645

2610

}

2611

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

2612

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

1646

2613

}

1647

close(devnull);

2614

run_network_hooks("start", interfaces_hooks != NULL ?

2615

interfaces_hooks : "", delay);

1648

2616

}

1649

2617

1650

2618

if(not debug){

1651

2619

avahi_set_log_function(empty_log);

1652

2620

}

1653

2621

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

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

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

1686

2622

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

1687

2623

from the signal handler */

1688

2624

/* Initialize the pseudo-RNG for Avahi */

1689

2625

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

1690

mc.simple_poll = avahi_simple_poll_new();

1691

if(mc.simple_poll == NULL){

1692

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

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");

1693

2630

exitcode = EX_UNAVAILABLE;

1694

2631

goto end;

1695

2632

}

1757

2694

}

1758

2695

}

1759

2696

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

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);

2721

} 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;

1845

2748

}

1846

2749

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

1864

2750

break;

1865

2751

}

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

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);

1903

2780

}

1904

2781

1905

2782

if(quit_now){

1906

2783

goto end;

1907

2784

}

1908

2785

1909

ret = init_gnutls_global(pubkey, seckey);

2786

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

1910

2787

if(ret == -1){

1911

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

2788

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

1912

2789

exitcode = EX_UNAVAILABLE;

1913

2790

goto end;

1914

2791

} else {

1919

2796

goto end;

1920

2797

}

1921

2798

1922

if(mkdtemp(tempdir) == NULL){

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){

1923

2809

perror_plus("mkdtemp");

1924

2810

goto end;

1925

2811

}

1926

tempdir_created = true;

1927

2812

1928

2813

if(quit_now){

1929

2814

goto end;

1930

2815

}

1931

2816

1932

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

1933

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

2817

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

2818

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

1934

2819

exitcode = EX_UNAVAILABLE;

1935

2820

goto end;

1936

2821

} else {

1945

2830

/* Connect directly, do not use Zeroconf */

1946

2831

/* (Mainly meant for debugging) */

1947

2832

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

2833

1948

2834

if(address == NULL){

1949

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

2835

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

1950

2836

exitcode = EX_USAGE;

1951

2837

goto end;

1952

2838

}

1955

2841

goto end;

1956

2842

}

1957

2843

1958

uint16_t port;

2844

in_port_t port;

1959

2845

errno = 0;

1960

2846

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

1961

2847

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

1962

or tmpmax != (uint16_t)tmpmax){

1963

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

2848

or tmpmax != (in_port_t)tmpmax){

2849

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

1964

2850

exitcode = EX_USAGE;

1965

2851

goto end;

1966

2852

}

1967

2853

1968

2854

if(quit_now){

1969

2855

goto end;

1970

2856

}

1971

2857

1972

port = (uint16_t)tmpmax;

2858

port = (in_port_t)tmpmax;

1973

2859

*address = '\0';

1974

2860

/* Colon in address indicates IPv6 */

1975

2861

int af;

1991

2877

}

1992

2878

1993

2879

while(not quit_now){

1994

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

2880

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

2881

&mc);

1995

2882

if(quit_now or ret == 0){

1996

2883

break;

1997

2884

}

1998

2885

if(debug){

1999

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

2000

(int)retry_interval);

2886

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

2887

(int)retry_interval);

2001

2888

}

2002

sleep((int)retry_interval);

2889

sleep((unsigned int)retry_interval);

2003

2890

}

2004

2891

2005

if (not quit_now){

2892

if(not quit_now){

2006

2893

exitcode = EXIT_SUCCESS;

2007

2894

}

2008

2895

2023

2910

config.publish_domain = 0;

2024

2911

2025

2912

/* Allocate a new server */

2026

mc.server = avahi_server_new(avahi_simple_poll_get

2027

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2913

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2914

&config, NULL, NULL, &ret);

2029

2915

2030

2916

/* Free the Avahi configuration data */

2031

2917

avahi_server_config_free(&config);

2033

2919

2034

2920

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

2035

2921

if(mc.server == NULL){

2036

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

2037

avahi_strerror(error));

2922

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

2923

avahi_strerror(ret));

2038

2924

exitcode = EX_UNAVAILABLE;

2039

2925

goto end;

2040

2926

}

2046

2932

/* Create the Avahi service browser */

2047

2933

sb = avahi_s_service_browser_new(mc.server, if_index,

2048

2934

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2049

NULL, 0, browse_callback, NULL);

2935

NULL, 0, browse_callback,

2936

(void *)&mc);

2050

2937

if(sb == NULL){

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2938

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

2939

avahi_strerror(avahi_server_errno(mc.server)));

2053

2940

exitcode = EX_UNAVAILABLE;

2054

2941

goto end;

2055

2942

}

2061

2948

/* Run the main loop */

2062

2949

2063

2950

if(debug){

2064

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

2951

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

2065

2952

}

2066

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2953

2954

ret = avahi_loop_with_timeout(simple_poll,

2955

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

2069

2956

if(debug){

2070

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

2071

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

2957

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

2958

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

2072

2959

}

2073

2960

2074

2961

end:

2075

2962

2076

2963

if(debug){

2077

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

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

}

2078

2971

}

2079

2972

2080

2973

/* Cleanup things */

2974

free(mc.interfaces);

2975

2081

2976

if(sb != NULL)

2082

2977

avahi_s_service_browser_free(sb);

2083

2978

2084

2979

if(mc.server != NULL)

2085

2980

avahi_server_free(mc.server);

2086

2981

2087

if(mc.simple_poll != NULL)

2088

avahi_simple_poll_free(mc.simple_poll);

2982

if(simple_poll != NULL)

2983

avahi_simple_poll_free(simple_poll);

2089

2984

2090

2985

if(gnutls_initialized){

2091

2986

gnutls_certificate_free_credentials(mc.cred);

2092

gnutls_global_deinit();

2093

2987

gnutls_dh_params_deinit(mc.dh_params);

2094

2988

}

2095

2989

2096

2990

if(gpgme_initialized){

2097

2991

gpgme_release(mc.ctx);

2098

2992

}

2099

2993

2100

2994

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

2101

2995

has seen */

2102

2996

if(mc.current_server != NULL){

2103

2997

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

2104

2998

while(mc.current_server != NULL){

2105

2999

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

2106

3008

free(mc.current_server);

2107

3009

mc.current_server = next;

2108

3010

}

2109

3011

}

2110

3012

2111

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

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2120

}

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2130

}

2131

}

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2141

}

2142

}

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

}

3042

}

3043

3044

ret = lower_privileges_permanently();

3045

if(ret != 0){

3046

errno = ret;

3047

perror_plus("Failed to lower privileges permanently");

3048

}

3049

}

3050

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){

3056

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){

3070

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);

2143

3106

}

2144

3107

2145

3108

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

2146

if(tempdir_created){

2147

struct dirent **direntries = NULL;

2148

struct dirent *direntry = NULL;

2149

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

2150

alphasort);

2151

if (numentries > 0){

2152

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

2153

direntry = direntries[i];

2154

char *fullname = NULL;

2155

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

2156

direntry->d_name);

2157

if(ret < 0){

2158

perror_plus("asprintf");

2159

continue;

2160

}

2161

ret = remove(fullname);

2162

if(ret == -1){

2163

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

2164

strerror(errno));

2165

}

2166

free(fullname);

2167

}

2168

}

2169

2170

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

2171

free(direntries);

2172

if (numentries == -1){

2173

perror_plus("scandir");

2174

}

2175

ret = rmdir(tempdir);

2176

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

2177

perror_plus("rmdir");

2178

}

3109

if(tempdir != NULL){

3110

clean_dir_at(-1, tempdir, 0);

2179

3111

}

2180

3112

2181

3113

if(quit_now){