/mandos/release : revision 237.7.238

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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215

}

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return buffer_capacity;

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}

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

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

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return false;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

243

if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

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} else {

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new_server->next = mc.current_server;

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

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

222

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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bool import_key(const char *filename){

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bool import_key(const char * const filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

281

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

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gpgme_strsource(rc), gpgme_strerror(rc));

312

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

284

315

}

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286

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

287

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rc = gpgme_get_engine_info(&engine_info);

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319

if(rc != GPG_ERR_NO_ERROR){

289

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

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gpgme_strsource(rc), gpgme_strerror(rc));

320

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

292

323

}

293

324

while(engine_info != NULL){

299

330

engine_info = engine_info->next;

300

331

}

301

332

if(engine_info == NULL){

302

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

333

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

334

tempdir);

303

335

return false;

304

336

}

305

337

306

338

/* Create new GPGME "context" */

307

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

339

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

308

340

if(rc != GPG_ERR_NO_ERROR){

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

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

343

gpgme_strerror(rc));

311

344

return false;

312

345

}

313

346

322

355

* Decrypt OpenPGP data.

323

356

* Returns -1 on error

324

357

*/

358

__attribute__((nonnull, warn_unused_result))

325

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

326

360

size_t crypto_size,

327

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

328

363

gpgme_data_t dh_crypto, dh_plain;

329

364

gpgme_error_t rc;

330

365

ssize_t ret;

332

367

ssize_t plaintext_length = 0;

333

368

334

369

if(debug){

335

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

370

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

336

371

}

337

372

338

373

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

339

374

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

375

0);

341

376

if(rc != GPG_ERR_NO_ERROR){

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

344

379

return -1;

345

380

}

346

381

347

382

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

348

383

rc = gpgme_data_new(&dh_plain);

349

384

if(rc != GPG_ERR_NO_ERROR){

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

385

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

352

388

gpgme_data_release(dh_crypto);

353

389

return -1;

354

390

}

355

391

356

392

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

357

393

data buffer */

358

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

394

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

359

395

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

396

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

362

398

plaintext_length = -1;

363

399

if(debug){

364

400

gpgme_decrypt_result_t result;

365

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

366

402

if(result == NULL){

367

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

403

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

368

404

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

405

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

406

result->unsupported_algorithm);

407

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

408

result->wrong_key_usage);

373

409

if(result->file_name != NULL){

374

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

410

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

375

411

}

376

412

gpgme_recipient_t recipient;

377

413

recipient = result->recipients;

378

414

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

415

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

416

gpgme_pubkey_algo_name

417

(recipient->pubkey_algo));

418

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

419

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

420

recipient->status == GPG_ERR_NO_SECKEY

421

? "No" : "Yes");

385

422

recipient = recipient->next;

386

423

}

387

424

}

390

427

}

391

428

392

429

if(debug){

393

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

430

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

394

431

}

395

432

396

433

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

403

440

*plaintext = NULL;

404

441

while(true){

405

442

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

443

(size_t)plaintext_length,

444

plaintext_capacity);

408

445

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

446

perror_plus("incbuffer");

447

plaintext_length = -1;

448

goto decrypt_end;

412

449

}

413

450

414

451

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

464

}

428

465

429

466

if(debug){

430

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

467

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

431

468

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

432

469

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

433

470

}

444

481

return plaintext_length;

445

482

}

446

483

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

450

487

if(ret == NULL)

451

488

ret = "(unknown)";

452

489

return ret;

453

490

}

454

491

455

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

456

494

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

457

495

const char* string){

458

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

496

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

459

497

}

460

498

499

__attribute__((nonnull, warn_unused_result))

461

500

static int init_gnutls_global(const char *pubkeyfilename,

462

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

463

503

int ret;

464

504

465

505

if(debug){

466

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

506

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

467

507

}

468

508

469

509

ret = gnutls_global_init();

470

510

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

511

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

512

safer_gnutls_strerror(ret));

473

513

return -1;

474

514

}

475

515

482

522

}

483

523

484

524

/* OpenPGP credentials */

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

526

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

527

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

528

safer_gnutls_strerror(ret));

489

529

gnutls_global_deinit();

490

530

return -1;

491

531

}

492

532

493

533

if(debug){

494

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

495

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

496

seckeyfilename);

534

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

497

538

}

498

539

499

540

ret = gnutls_certificate_set_openpgp_key_file

500

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

501

542

GNUTLS_OPENPGP_FMT_BASE64);

502

543

if(ret != GNUTLS_E_SUCCESS){

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

544

fprintf_plus(stderr,

545

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

546

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

547

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

548

safer_gnutls_strerror(ret));

508

549

goto globalfail;

509

550

}

510

551

511

552

/* GnuTLS server initialization */

512

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

513

554

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

516

558

goto globalfail;

517

559

}

518

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

560

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

519

561

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

562

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

563

safer_gnutls_strerror(ret));

522

564

goto globalfail;

523

565

}

524

566

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

526

568

527

569

return 0;

528

570

529

571

globalfail:

530

572

531

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

532

574

gnutls_global_deinit();

533

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

534

576

return -1;

535

577

}

536

578

537

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

538

582

int ret;

539

583

/* GnuTLS session creation */

540

584

do {

544

588

}

545

589

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

546

590

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

549

594

}

550

595

551

596

{

552

597

const char *err;

553

598

do {

554

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

599

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

555

600

if(quit_now){

556

601

gnutls_deinit(*session);

557

602

return -1;

558

603

}

559

604

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

560

605

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

safer_gnutls_strerror(ret));

606

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

607

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

608

safer_gnutls_strerror(ret));

564

609

gnutls_deinit(*session);

565

610

return -1;

566

611

}

568

613

569

614

do {

570

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

571

mc.cred);

616

mc->cred);

572

617

if(quit_now){

573

618

gnutls_deinit(*session);

574

619

return -1;

575

620

}

576

621

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

577

622

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

623

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

624

safer_gnutls_strerror(ret));

580

625

gnutls_deinit(*session);

581

626

return -1;

582

627

}

584

629

/* ignore client certificate if any. */

585

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

586

631

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

588

633

589

634

return 0;

590

635

}

594

639

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

595

640

596

641

/* Called when a Mandos server is found */

597

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

642

__attribute__((nonnull, warn_unused_result))

643

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

598

644

AvahiIfIndex if_index,

599

int af){

645

int af, mandos_context *mc){

600

646

int ret, tcp_sd = -1;

601

647

ssize_t sret;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

648

struct sockaddr_storage to;

606

649

char *buffer = NULL;

607

650

char *decrypted_buffer = NULL;

608

651

size_t buffer_length = 0;

627

670

pf = PF_INET;

628

671

break;

629

672

default:

630

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

673

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

631

674

errno = EINVAL;

632

675

return -1;

633

676

}

634

677

635

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

636

711

if(ret != 0){

637

712

return -1;

638

713

}

639

714

640

715

if(debug){

641

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

642

"\n", ip, port);

716

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

717

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

643

718

}

644

719

645

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

657

732

658

733

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

659

734

if(af == AF_INET6){

660

to.in6.sin6_family = (sa_family_t)af;

661

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

735

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

736

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

662

737

} else { /* IPv4 */

663

to.in.sin_family = (sa_family_t)af;

664

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

738

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

739

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

665

740

}

666

741

if(ret < 0 ){

667

742

int e = errno;

671

746

}

672

747

if(ret == 0){

673

748

int e = errno;

674

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

749

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

675

750

errno = e;

676

751

goto mandos_end;

677

752

}

678

753

if(af == AF_INET6){

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

686

757

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

758

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

759

" incomplete without a network interface\n");

689

760

errno = EINVAL;

690

761

goto mandos_end;

691

762

}

692

763

/* Set the network interface number as scope */

693

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

694

765

}

695

766

} else {

696

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

697

-Wconversion and

698

-Wunreachable-code */

767

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

699

768

}

700

769

701

770

if(quit_now){

709

778

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

710

779

perror_plus("if_indextoname");

711

780

} else {

712

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

713

ip, interface, port);

781

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

782

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

714

783

}

715

784

} else {

716

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

717

port);

785

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

786

ip, (uintmax_t)port);

718

787

}

719

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

721

const char *pcret;

722

790

if(af == AF_INET6){

723

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

724

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

725

795

} else {

726

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

727

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

728

800

}

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

735

807

}

736

808

}

737

809

741

813

}

742

814

743

815

if(af == AF_INET6){

744

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

816

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

817

sizeof(struct sockaddr_in6));

745

818

} else {

746

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

819

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

820

sizeof(struct sockaddr_in));

747

821

}

748

822

if(ret < 0){

749

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

823

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

750

824

int e = errno;

751

825

perror_plus("connect");

752

826

errno = e;

764

838

while(true){

765

839

size_t out_size = strlen(out);

766

840

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

767

out_size - written));

841

out_size - written));

768

842

if(ret == -1){

769

843

int e = errno;

770

844

perror_plus("write");

790

864

}

791

865

792

866

if(debug){

793

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

867

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

794

868

}

795

869

796

870

if(quit_now){

798

872

goto mandos_end;

799

873

}

800

874

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

803

880

804

881

if(quit_now){

805

882

errno = EINTR;

816

893

817

894

if(ret != GNUTLS_E_SUCCESS){

818

895

if(debug){

819

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

896

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

820

897

gnutls_perror(ret);

821

898

}

822

899

errno = EPROTO;

826

903

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

827

904

828

905

if(debug){

829

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

830

ip);

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

831

908

}

832

909

833

910

while(true){

838

915

}

839

916

840

917

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

918

buffer_capacity);

842

919

if(buffer_capacity == 0){

843

920

int e = errno;

844

921

perror_plus("incbuffer");

871

948

}

872

949

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

873

950

if(ret < 0){

874

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

951

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

952

"***\n");

875

953

gnutls_perror(ret);

876

954

errno = EPROTO;

877

955

goto mandos_end;

878

956

}

879

957

break;

880

958

default:

881

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

882

" encrypted session with Mandos server\n");

959

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

960

" encrypted session with Mandos server\n");

883

961

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

962

errno = EIO;

885

963

goto mandos_end;

890

968

}

891

969

892

970

if(debug){

893

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

971

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

894

972

}

895

973

896

974

if(quit_now){

908

986

909

987

if(buffer_length > 0){

910

988

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

914

991

if(decrypted_buffer_size >= 0){

915

992

916

993

written = 0;

926

1003

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

927

1004

int e = errno;

928

1005

if(debug){

929

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

930

strerror(errno));

1006

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

1007

strerror(errno));

931

1008

}

932

1009

errno = e;

933

1010

goto mandos_end;

964

1041

return retval;

965

1042

}

966

1043

1044

__attribute__((nonnull))

967

1045

static void resolve_callback(AvahiSServiceResolver *r,

968

1046

AvahiIfIndex interface,

969

1047

AvahiProtocol proto,

977

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

978

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

979

1057

flags,

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

982

1062

983

1063

/* Called whenever a service has been resolved successfully or

984

1064

timed out */

990

1070

switch(event){

991

1071

default:

992

1072

case AVAHI_RESOLVER_FAILURE:

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

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

1075

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

996

1078

break;

997

1079

998

1080

case AVAHI_RESOLVER_FOUND:

1000

1082

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1083

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

1002

1084

if(debug){

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1085

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

1086

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

1087

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

1006

1088

}

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1009

1093

if(ret == 0){

1010

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1011

1095

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1014

1102

}

1015

1103

}

1016

1104

}

1026

1114

const char *domain,

1027

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1028

1116

flags,

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1031

1121

1032

1122

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

1033

1123

is removed from the LAN */

1040

1130

default:

1041

1131

case AVAHI_BROWSER_FAILURE:

1042

1132

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1133

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1046

1137

return;

1047

1138

1048

1139

case AVAHI_BROWSER_NEW:

1051

1142

the callback function is called the Avahi server will free the

1052

1143

resolver for us. */

1053

1144

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1149

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

1150

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

1059

1153

break;

1060

1154

1061

1155

case AVAHI_BROWSER_REMOVE:

1064

1158

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1159

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1160

if(debug){

1067

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

1161

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

1162

" searching...\n");

1068

1163

}

1069

1164

break;

1070

1165

}

1079

1174

signal_received = sig;

1080

1175

int old_errno = errno;

1081

1176

/* set main loop to exit */

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1084

1179

}

1085

1180

errno = old_errno;

1086

1181

}

1087

1182

1183

__attribute__((nonnull, warn_unused_result))

1184

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

1185

int ret;

1186

error_t ret_errno;

1187

1188

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

1189

if(s < 0){

1190

ret_errno = errno;

1191

perror_plus("socket");

1192

errno = ret_errno;

1193

return false;

1194

}

1195

strcpy(ifr->ifr_name, ifname);

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

if(ret == -1){

1198

if(debug){

1199

ret_errno = errno;

1200

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1202

}

1203

return false;

1204

}

1205

return true;

1206

}

1207

1208

__attribute__((nonnull, warn_unused_result))

1209

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

1210

1211

/* Reject the loopback device */

1212

if(ifr->ifr_flags & IFF_LOOPBACK){

1213

if(debug){

1214

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

1215

ifname);

1216

}

1217

return false;

1218

}

1219

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

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return true;

1226

}

1227

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

1228

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

1229

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1232

}

1233

return false;

1234

}

1235

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

1236

if(ifr->ifr_flags & IFF_NOARP){

1237

if(debug){

1238

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

1239

ifname);

1240

}

1241

return false;

1242

}

1243

1244

/* Accept this device */

1245

if(debug){

1246

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

1247

}

1248

return true;

1249

}

1250

1088

1251

/*

1089

1252

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

1090

1253

* corresponds to an acceptable network device.

1091

1254

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

1092

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1093

1257

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

1258

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

1097

1259

return 0;

1098

1260

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1144

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1155

if(debug){

1156

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

1157

if_entry->d_name);

1158

}

1159

return 0;

1160

}

1161

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

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 1;

1168

}

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1171

if(debug){

1172

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

1173

if_entry->d_name);

1174

}

1175

return 0;

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

if_entry->d_name);

1261

1262

struct ifreq ifr;

1263

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

1264

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1189

1273

}

1190

1274

return 1;

1191

1275

}

1192

1276

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1193

1312

int notdotentries(const struct dirent *direntry){

1194

1313

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

1195

1314

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

1201

1320

return 1;

1202

1321

}

1203

1322

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1325

int runnable_hook(const struct dirent *direntry){

1326

int ret;

1327

size_t sret;

1328

struct stat st;

1329

1330

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

1331

/* Empty name? */

1332

return 0;

1333

}

1334

1335

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

1336

"abcdefghijklmnopqrstuvwxyz"

1337

"0123456789"

1338

"_.-");

1339

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

1340

/* Contains non-allowed characters */

1341

if(debug){

1342

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

1343

direntry->d_name);

1344

}

1345

return 0;

1346

}

1347

1348

char *fullname = NULL;

1349

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

1350

if(ret < 0){

1351

perror_plus("asprintf");

1352

return 0;

1353

}

1354

1355

ret = stat(fullname, &st);

1356

if(ret == -1){

1357

if(debug){

1358

perror_plus("Could not stat hook");

1359

}

1360

return 0;

1361

}

1362

free(fullname);

1363

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

1364

/* Not a regular file */

1365

if(debug){

1366

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

1367

direntry->d_name);

1368

}

1369

return 0;

1370

}

1371

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

1372

/* Not executable */

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

return 0;

1378

}

1379

if(debug){

1380

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

1381

direntry->d_name);

1382

}

1383

return 1;

1384

}

1385

1386

__attribute__((nonnull, warn_unused_result))

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

mandos_context *mc){

1205

1389

int ret;

1206

1390

struct timespec now;

1207

1391

struct timespec waited_time;

1208

1392

intmax_t block_time;

1209

1393

1210

1394

while(true){

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1395

if(mc->current_server == NULL){

1396

if(debug){

1397

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

1398

" No timeout!\n");

1215

1399

}

1216

1400

ret = avahi_simple_poll_iterate(s, -1);

1217

1401

} else {

1218

if (debug){

1219

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

1220

" or wait\n");

1402

if(debug){

1403

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

1404

" it, or wait\n");

1221

1405

}

1222

1406

/* the current time */

1223

1407

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1228

1412

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

1229

1413

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

1230

1414

waited_time.tv_sec = (now.tv_sec

1231

- mc.current_server->last_seen.tv_sec);

1415

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

1232

1416

waited_time.tv_nsec = (now.tv_nsec

1233

- mc.current_server->last_seen.tv_nsec);

1417

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

1234

1418

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

1235

1419

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

1236

1420

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

1238

1422

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

1239

1423

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

1240

1424

1241

if (debug){

1242

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

1425

if(debug){

1426

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

1427

block_time);

1243

1428

}

1244

1429

1245

1430

if(block_time <= 0){

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1431

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

1432

mc->current_server->port,

1433

mc->current_server->if_index,

1434

mc->current_server->af, mc);

1250

1435

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1436

avahi_simple_poll_quit(s);

1252

1437

return 0;

1253

1438

}

1254

1439

ret = clock_gettime(CLOCK_MONOTONIC,

1255

&mc.current_server->last_seen);

1440

&mc->current_server->last_seen);

1256

1441

if(ret == -1){

1257

1442

perror_plus("clock_gettime");

1258

1443

return -1;

1259

1444

}

1260

mc.current_server = mc.current_server->next;

1445

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

1261

1446

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

1262

1447

servers, but don't block */

1263

1448

}

1265

1450

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

1266

1451

}

1267

1452

if(ret != 0){

1268

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

1453

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

1269

1454

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

1270

1455

}

1271

1456

}

1272

1457

}

1273

1458

}

1274

1459

1460

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

1461

__attribute__((warn_unused_result))

1462

error_t raise_privileges(void){

1463

error_t old_errno = errno;

1464

error_t ret_errno = 0;

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

__attribute__((warn_unused_result))

1475

error_t raise_privileges_permanently(void){

1476

error_t old_errno = errno;

1477

error_t ret_errno = raise_privileges();

1478

if(ret_errno != 0){

1479

errno = old_errno;

1480

return ret_errno;

1481

}

1482

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

1483

ret_errno = errno;

1484

perror_plus("seteuid");

1485

}

1486

errno = old_errno;

1487

return ret_errno;

1488

}

1489

1490

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

1491

__attribute__((warn_unused_result))

1492

error_t lower_privileges(void){

1493

error_t old_errno = errno;

1494

error_t ret_errno = 0;

1495

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

1496

ret_errno = errno;

1497

perror_plus("seteuid");

1498

}

1499

errno = old_errno;

1500

return ret_errno;

1501

}

1502

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

error_t lower_privileges_permanently(void){

1506

error_t old_errno = errno;

1507

error_t ret_errno = 0;

1508

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

1509

ret_errno = errno;

1510

perror_plus("setuid");

1511

}

1512

errno = old_errno;

1513

return ret_errno;

1514

}

1515

1516

__attribute__((nonnull))

1517

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

1518

const float delay){

1519

struct dirent **direntries;

1520

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

1521

alphasort);

1522

if(numhooks == -1){

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("scandir");

1530

}

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1534

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

1535

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

1536

direntry = direntries[i];

1537

char *fullname = NULL;

1538

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

1539

if(ret < 0){

1540

perror_plus("asprintf");

1541

continue;

1542

}

1543

if(debug){

1544

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

1545

direntry->d_name);

1546

}

1547

pid_t hook_pid = fork();

1548

if(hook_pid == 0){

1549

/* Child */

1550

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1555

/* Set group */

1556

errno = 0;

1557

ret = setgid(0);

1558

if(ret == -1){

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

}

1562

/* Reset supplementary groups */

1563

errno = 0;

1564

ret = setgroups(0, NULL);

1565

if(ret == -1){

1566

perror_plus("setgroups");

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1584

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

1585

if(ret == -1){

1586

perror_plus("setenv");

1587

_exit(EX_OSERR);

1588

}

1589

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

1590

if(ret == -1){

1591

perror_plus("setenv");

1592

_exit(EX_OSERR);

1593

}

1594

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

1595

if(ret == -1){

1596

perror_plus("setenv");

1597

_exit(EX_OSERR);

1598

}

1599

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

1600

if(ret == -1){

1601

perror_plus("setenv");

1602

_exit(EX_OSERR);

1603

}

1604

char *delaystring;

1605

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

1606

if(ret == -1){

1607

perror_plus("asprintf");

1608

_exit(EX_OSERR);

1609

}

1610

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

1611

if(ret == -1){

1612

free(delaystring);

1613

perror_plus("setenv");

1614

_exit(EX_OSERR);

1615

}

1616

free(delaystring);

1617

if(connect_to != NULL){

1618

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

1619

if(ret == -1){

1620

perror_plus("setenv");

1621

_exit(EX_OSERR);

1622

}

1623

}

1624

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

1625

perror_plus("execl");

1626

_exit(EXIT_FAILURE);

1627

}

1628

} else {

1629

int status;

1630

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

1631

perror_plus("waitpid");

1632

free(fullname);

1633

continue;

1634

}

1635

if(WIFEXITED(status)){

1636

if(WEXITSTATUS(status) != 0){

1637

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

1638

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

1639

WEXITSTATUS(status));

1640

free(fullname);

1641

continue;

1642

}

1643

} else if(WIFSIGNALED(status)){

1644

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

1645

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

1646

WTERMSIG(status));

1647

free(fullname);

1648

continue;

1649

} else {

1650

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

1651

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

1652

free(fullname);

1653

continue;

1654

}

1655

}

1656

free(fullname);

1657

if(debug){

1658

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

1659

direntry->d_name);

1660

}

1661

}

1662

close(devnull);

1663

}

1664

}

1665

1666

__attribute__((nonnull, warn_unused_result))

1667

error_t bring_up_interface(const char *const interface,

1668

const float delay){

1669

error_t old_errno = errno;

1670

int ret;

1671

struct ifreq network;

1672

unsigned int if_index = if_nametoindex(interface);

1673

if(if_index == 0){

1674

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

1675

errno = old_errno;

1676

return ENXIO;

1677

}

1678

1679

if(quit_now){

1680

errno = old_errno;

1681

return EINTR;

1682

}

1683

1684

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1687

ret_errno = errno;

1688

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

1689

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

1690

errno = old_errno;

1691

return ret_errno;

1692

}

1693

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

1694

1695

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

1696

if(sd == -1){

1697

ret_errno = errno;

1698

perror_plus("socket");

1699

errno = old_errno;

1700

return ret_errno;

1701

}

1702

1703

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1708

errno = old_errno;

1709

return EINTR;

1710

}

1711

1712

if(debug){

1713

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

1714

interface);

1715

}

1716

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1722

1723

#ifdef __linux__

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1735

}

1736

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1739

#ifdef __linux__

1740

if(restore_loglevel){

1741

ret_linux = klogctl(7, NULL, 0);

1742

if(ret_linux == -1){

1743

perror_plus("klogctl");

1744

}

1745

}

1746

#endif /* __linux__ */

1747

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1757

1758

/* Close the socket */

1759

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

1760

if(ret == -1){

1761

perror_plus("close");

1762

}

1763

1764

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

errno = old_errno;

1768

return ioctl_errno;

1769

}

1770

} else if(debug){

1771

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

1772

interface);

1773

}

1774

1775

/* Sleep checking until interface is running.

1776

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

1777

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

1778

if(interface_is_running(interface)){

1779

break;

1780

}

1781

struct timespec sleeptime = { .tv_nsec = 250000000 };

1782

ret = nanosleep(&sleeptime, NULL);

1783

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

1784

perror_plus("nanosleep");

1785

}

1786

}

1787

1788

errno = old_errno;

1789

return 0;

1790

}

1791

1792

__attribute__((nonnull, warn_unused_result))

1793

error_t take_down_interface(const char *const interface){

1794

error_t old_errno = errno;

1795

struct ifreq network;

1796

unsigned int if_index = if_nametoindex(interface);

1797

if(if_index == 0){

1798

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

1799

errno = old_errno;

1800

return ENXIO;

1801

}

1802

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1804

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

1805

ret_errno = errno;

1806

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

1807

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

1808

errno = old_errno;

1809

return ret_errno;

1810

}

1811

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

1812

1813

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

1814

if(sd == -1){

1815

ret_errno = errno;

1816

perror_plus("socket");

1817

errno = old_errno;

1818

return ret_errno;

1819

}

1820

1821

if(debug){

1822

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

1823

interface);

1824

}

1825

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1831

1832

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

1833

ioctl_errno = errno;

1834

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1844

1845

/* Close the socket */

1846

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

1847

if(ret == -1){

1848

perror_plus("close");

1849

}

1850

1851

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

errno = old_errno;

1855

return ioctl_errno;

1856

}

1857

} else if(debug){

1858

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

1859

interface);

1860

}

1861

1862

errno = old_errno;

1863

return 0;

1864

}

1865

1275

1866

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

1867

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

1868

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

1869

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

1870

.interfaces = NULL, .interfaces_size = 0 };

1276

1871

AvahiSServiceBrowser *sb = NULL;

1277

int error;

1872

error_t ret_errno;

1278

1873

int ret;

1279

1874

intmax_t tmpmax;

1280

1875

char *tmp;

1281

1876

int exitcode = EXIT_SUCCESS;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1288

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

1289

bool tempdir_created = false;

1877

char *interfaces_to_take_down = NULL;

1878

size_t interfaces_to_take_down_size = 0;

1879

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

1880

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

1881

char *tempdir = NULL;

1290

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1291

1883

const char *seckey = PATHDIR "/" SECKEY;

1292

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1885

char *interfaces_hooks = NULL;

1293

1886

1294

1887

bool gnutls_initialized = false;

1295

1888

bool gpgme_initialized = false;

1357

1950

.group = 2 },

1358

1951

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

1359

1952

.arg = "SECONDS",

1360

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

1953

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

1954

.group = 2 },

1955

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

1956

.arg = "DIR",

1957

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

1361

1958

.group = 2 },

1362

1959

/*

1363

1960

* These reproduce what we would get without ARGP_NO_HELP

1382

1979

connect_to = arg;

1383

1980

break;

1384

1981

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

1385

interface = arg;

1982

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

1983

arg, (int)',');

1984

if(ret_errno != 0){

1985

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

1986

}

1386

1987

break;

1387

1988

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

1388

1989

seckey = arg;

1417

2018

argp_error(state, "Bad retry interval");

1418

2019

}

1419

2020

break;

2021

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

2022

hookdir = arg;

2023

break;

1420

2024

/*

1421

2025

* These reproduce what we would get without ARGP_NO_HELP

1422

2026

*/

1428

2032

argp_state_help(state, state->out_stream,

1429

2033

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

2034

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

1431

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

2035

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

1432

2036

exit(argp_err_exit_status);

1433

2037

break;

1434

2038

default:

1461

2065

{

1462

2066

/* Work around Debian bug #633582:

1463

2067

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

2068

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

2075

struct stat st;

2076

2077

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

2078

int seckey_fd = open(seckey, O_RDONLY);

2079

if(seckey_fd == -1){

2080

perror_plus("open");

2081

} else {

2082

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

2083

if(ret == -1){

2084

perror_plus("fstat");

2085

} else {

2086

if(S_ISREG(st.st_mode)

2087

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

2088

ret = fchown(seckey_fd, uid, gid);

2089

if(ret == -1){

2090

perror_plus("fchown");

2091

}

2092

}

2093

}

2094

TEMP_FAILURE_RETRY(close(seckey_fd));

2095

}

2096

}

2097

2098

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

2099

int pubkey_fd = open(pubkey, O_RDONLY);

2100

if(pubkey_fd == -1){

2101

perror_plus("open");

2102

} else {

2103

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

2104

if(ret == -1){

2105

perror_plus("fstat");

2106

} else {

2107

if(S_ISREG(st.st_mode)

2108

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

2109

ret = fchown(pubkey_fd, uid, gid);

2110

if(ret == -1){

2111

perror_plus("fchown");

2112

}

2113

}

2114

}

2115

TEMP_FAILURE_RETRY(close(pubkey_fd));

2116

}

2117

}

2118

2119

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2124

}

2125

}

2126

}

2127

2128

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

2129

{

2130

char *interface = NULL;

2131

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

2132

interface))){

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2136

fprintf_plus(stderr, "Not using nonexisting interface"

2137

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

2138

}

2139

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

2140

interface = NULL;

2141

}

2142

}

2143

}

2144

2145

/* Run network hooks */

2146

{

2147

if(mc.interfaces != NULL){

2148

interfaces_hooks = malloc(mc.interfaces_size);

2149

if(interfaces_hooks == NULL){

2150

perror_plus("malloc");

2151

goto end;

2152

}

2153

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

2154

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

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

1519

2158

}

1520

2159

1521

2160

if(not debug){

1522

2161

avahi_set_log_function(empty_log);

1523

2162

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

1549

2163

1550

2164

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

1551

2165

from the signal handler */

1552

2166

/* Initialize the pseudo-RNG for Avahi */

1553

2167

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

1554

mc.simple_poll = avahi_simple_poll_new();

1555

if(mc.simple_poll == NULL){

1556

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

2168

simple_poll = avahi_simple_poll_new();

2169

if(simple_poll == NULL){

2170

fprintf_plus(stderr,

2171

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

1557

2172

exitcode = EX_UNAVAILABLE;

1558

2173

goto end;

1559

2174

}

1621

2236

}

1622

2237

}

1623

2238

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

2239

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

2240

if(mc.interfaces == NULL){

2241

struct dirent **direntries;

2242

/* Look for any good interfaces */

2243

ret = scandir(sys_class_net, &direntries, good_interface,

2244

alphasort);

2245

if(ret >= 1){

2246

/* Add all found interfaces to interfaces list */

2247

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

2248

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

2249

direntries[i]->d_name);

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("argz_add");

2253

continue;

2254

}

2255

if(debug){

2256

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

2257

direntries[i]->d_name);

2258

}

2259

}

2260

free(direntries);

2261

} else {

2262

free(direntries);

2263

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

2264

exitcode = EXIT_FAILURE;

2265

goto end;

2266

}

2267

}

2268

2269

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

2270

{

2271

char *interface = NULL;

2272

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

2273

interface))){

2274

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

2275

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

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

while((interface = argz_next(mc.interfaces,

2281

mc.interfaces_size, interface))){

2282

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

2283

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

2284

interface);

2285

interface = NULL;

1709

2286

}

1710

2287

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

2288

break;

1729

2289

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

2290

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2292

if(not interface_was_up){

2293

if(errno != 0){

2294

perror_plus("Failed to bring up interface");

2295

} else {

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2300

perror_plus("argz_add");

2301

}

2302

}

2303

}

2304

}

2305

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

2306

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

2307

}

2308

}

2309

2310

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

2311

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

2312

if(debug){

2313

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

2314

mc.interfaces);

2315

}

2316

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

1767

2317

}

1768

2318

1769

2319

if(quit_now){

1770

2320

goto end;

1771

2321

}

1772

2322

1773

ret = init_gnutls_global(pubkey, seckey);

2323

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

1774

2324

if(ret == -1){

1775

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

2325

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

1776

2326

exitcode = EX_UNAVAILABLE;

1777

2327

goto end;

1778

2328

} else {

1783

2333

goto end;

1784

2334

}

1785

2335

1786

if(mkdtemp(tempdir) == NULL){

2336

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

2337

tempdir = mkdtemp(run_tempdir);

2338

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

2339

if(debug){

2340

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

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

1787

2346

perror_plus("mkdtemp");

1788

2347

goto end;

1789

2348

}

1790

tempdir_created = true;

1791

2349

1792

2350

if(quit_now){

1793

2351

goto end;

1794

2352

}

1795

2353

1796

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

1797

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

2354

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

2355

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

1798

2356

exitcode = EX_UNAVAILABLE;

1799

2357

goto end;

1800

2358

} else {

1809

2367

/* Connect directly, do not use Zeroconf */

1810

2368

/* (Mainly meant for debugging) */

1811

2369

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

2370

1812

2371

if(address == NULL){

1813

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

2372

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

1814

2373

exitcode = EX_USAGE;

1815

2374

goto end;

1816

2375

}

1819

2378

goto end;

1820

2379

}

1821

2380

1822

uint16_t port;

2381

in_port_t port;

1823

2382

errno = 0;

1824

2383

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

1825

2384

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2385

or tmpmax != (in_port_t)tmpmax){

2386

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

1828

2387

exitcode = EX_USAGE;

1829

2388

goto end;

1830

2389

}

1831

2390

1832

2391

if(quit_now){

1833

2392

goto end;

1834

2393

}

1835

2394

1836

port = (uint16_t)tmpmax;

2395

port = (in_port_t)tmpmax;

1837

2396

*address = '\0';

1838

2397

/* Colon in address indicates IPv6 */

1839

2398

int af;

1855

2414

}

1856

2415

1857

2416

while(not quit_now){

1858

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

2417

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

2418

&mc);

1859

2419

if(quit_now or ret == 0){

1860

2420

break;

1861

2421

}

1862

2422

if(debug){

1863

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

1864

(int)retry_interval);

2423

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

2424

(int)retry_interval);

1865

2425

}

1866

sleep((int)retry_interval);

2426

sleep((unsigned int)retry_interval);

1867

2427

}

1868

2428

1869

if (not quit_now){

2429

if(not quit_now){

1870

2430

exitcode = EXIT_SUCCESS;

1871

2431

}

1872

2432

1873

2433

goto end;

1874

2434

}

1875

2435

1887

2447

config.publish_domain = 0;

1888

2448

1889

2449

/* Allocate a new server */

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2450

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2451

&config, NULL, NULL, &ret_errno);

1893

2452

1894

2453

/* Free the Avahi configuration data */

1895

2454

avahi_server_config_free(&config);

1897

2456

1898

2457

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

1899

2458

if(mc.server == NULL){

1900

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

1901

avahi_strerror(error));

2459

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

2460

avahi_strerror(ret_errno));

1902

2461

exitcode = EX_UNAVAILABLE;

1903

2462

goto end;

1904

2463

}

1910

2469

/* Create the Avahi service browser */

1911

2470

sb = avahi_s_service_browser_new(mc.server, if_index,

1912

2471

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

NULL, 0, browse_callback, NULL);

2472

NULL, 0, browse_callback,

2473

(void *)&mc);

1914

2474

if(sb == NULL){

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2475

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

2476

avahi_strerror(avahi_server_errno(mc.server)));

1917

2477

exitcode = EX_UNAVAILABLE;

1918

2478

goto end;

1919

2479

}

1925

2485

/* Run the main loop */

1926

2486

1927

2487

if(debug){

1928

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

2488

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

1929

2489

}

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2490

2491

ret = avahi_loop_with_timeout(simple_poll,

2492

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

1933

2493

if(debug){

1934

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

1935

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

2494

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

2495

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

1936

2496

}

1937

2497

1938

2498

end:

1939

2499

1940

2500

if(debug){

1941

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

2501

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

1942

2502

}

1943

2503

1944

2504

/* Cleanup things */

2505

free(mc.interfaces);

2506

1945

2507

if(sb != NULL)

1946

2508

avahi_s_service_browser_free(sb);

1947

2509

1948

2510

if(mc.server != NULL)

1949

2511

avahi_server_free(mc.server);

1950

2512

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2513

if(simple_poll != NULL)

2514

avahi_simple_poll_free(simple_poll);

1953

2515

1954

2516

if(gnutls_initialized){

1955

2517

gnutls_certificate_free_credentials(mc.cred);

1960

2522

if(gpgme_initialized){

1961

2523

gpgme_release(mc.ctx);

1962

2524

}

1963

2525

1964

2526

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

1965

2527

has seen */

1966

2528

if(mc.current_server != NULL){

1972

2534

}

1973

2535

}

1974

2536

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

2537

/* Re-raise privileges */

2538

{

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

1982

2565

}

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2004

2570

}

2005

2571

}

2006

2572

2573

free(interfaces_to_take_down);

2574

free(interfaces_hooks);

2575

2007

2576

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

2008

if(tempdir_created){

2577

if(tempdir != NULL){

2009

2578

struct dirent **direntries = NULL;

2010

2579

struct dirent *direntry = NULL;

2011

2580

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

2012

2581

alphasort);

2013

if (numentries > 0){

2582

if(numentries > 0){

2014

2583

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

2015

2584

direntry = direntries[i];

2016

2585

char *fullname = NULL;

2022

2591

}

2023

2592

ret = remove(fullname);

2024

2593

if(ret == -1){

2025

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

2026

strerror(errno));

2594

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

2595

strerror(errno));

2027

2596

}

2028

2597

free(fullname);

2029

2598

}

2030

2599

}

2031

2600

2032

2601

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

2033

2602

free(direntries);

2034

if (numentries == -1){

2603

if(numentries == -1){

2035

2604

perror_plus("scandir");

2036

2605

}

2037

2606

ret = rmdir(tempdir);