/mandos/release : revision 237.16.2

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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opendir(), DIR */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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#include <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(), _exit() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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

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if(buffer == NULL){

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return false;

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return -1;

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}

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

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.port = port,

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.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 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){

239

perror_plus("clock_gettime");

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return false;

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return -1;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

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} else {

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

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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*/

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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bool import_key(const char * const filename){

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bool import_key(const char *filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

324

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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if(engine_info == NULL){

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

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tempdir);

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

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return false;

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}

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338

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/* Create new GPGME "context" */

339

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

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

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if(rc != GPG_ERR_NO_ERROR){

341

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

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

343

gpgme_strerror(rc));

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

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312

return false;

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}

346

314

355

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* Decrypt OpenPGP data.

356

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* Returns -1 on error

357

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*/

358

__attribute__((nonnull, warn_unused_result))

359

326

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

327

size_t crypto_size,

361

char **plaintext,

362

mandos_context *mc){

328

char **plaintext){

363

329

gpgme_data_t dh_crypto, dh_plain;

364

330

gpgme_error_t rc;

365

331

ssize_t ret;

367

333

ssize_t plaintext_length = 0;

368

334

369

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if(debug){

370

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

336

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

371

337

}

372

338

373

339

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

374

340

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

375

341

0);

376

342

if(rc != GPG_ERR_NO_ERROR){

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

379

345

return -1;

380

346

}

381

347

382

348

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

383

349

rc = gpgme_data_new(&dh_plain);

384

350

if(rc != GPG_ERR_NO_ERROR){

385

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

388

353

gpgme_data_release(dh_crypto);

389

354

return -1;

390

355

}

391

356

392

357

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

393

358

data buffer */

394

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

359

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

395

360

if(rc != GPG_ERR_NO_ERROR){

396

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

398

363

plaintext_length = -1;

399

364

if(debug){

400

365

gpgme_decrypt_result_t result;

401

result = gpgme_op_decrypt_result(mc->ctx);

366

result = gpgme_op_decrypt_result(mc.ctx);

402

367

if(result == NULL){

403

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

368

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

404

369

} else {

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);

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

409

374

if(result->file_name != NULL){

410

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

375

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

411

376

}

412

377

gpgme_recipient_t recipient;

413

378

recipient = result->recipients;

414

379

while(recipient != NULL){

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");

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

422

386

recipient = recipient->next;

423

387

}

424

388

}

427

391

}

428

392

429

393

if(debug){

430

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

394

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

431

395

}

432

396

433

397

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

440

404

*plaintext = NULL;

441

405

while(true){

442

406

plaintext_capacity = incbuffer(plaintext,

443

(size_t)plaintext_length,

444

plaintext_capacity);

407

(size_t)plaintext_length,

408

plaintext_capacity);

445

409

if(plaintext_capacity == 0){

446

perror_plus("incbuffer");

447

plaintext_length = -1;

448

goto decrypt_end;

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

449

413

}

450

414

451

415

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

464

428

}

465

429

466

430

if(debug){

467

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

431

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

468

432

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

469

433

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

470

434

}

481

445

return plaintext_length;

482

446

}

483

447

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

448

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

487

451

if(ret == NULL)

488

452

ret = "(unknown)";

489

453

return ret;

490

454

}

491

455

492

456

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

457

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

495

458

const char* string){

496

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

459

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

497

460

}

498

461

499

__attribute__((nonnull, warn_unused_result))

500

462

static int init_gnutls_global(const char *pubkeyfilename,

501

const char *seckeyfilename,

502

mandos_context *mc){

463

const char *seckeyfilename){

503

464

int ret;

504

465

505

466

if(debug){

506

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

467

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

507

468

}

508

469

509

470

ret = gnutls_global_init();

510

471

if(ret != GNUTLS_E_SUCCESS){

511

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

512

safer_gnutls_strerror(ret));

472

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

473

safer_gnutls_strerror(ret));

513

474

return -1;

514

475

}

515

476

522

483

}

523

484

524

485

/* OpenPGP credentials */

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

487

if(ret != GNUTLS_E_SUCCESS){

527

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

528

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

529

490

gnutls_global_deinit();

530

491

return -1;

531

492

}

532

493

533

494

if(debug){

534

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

495

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

496

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

497

seckeyfilename);

538

498

}

539

499

540

500

ret = gnutls_certificate_set_openpgp_key_file

541

(mc->cred, pubkeyfilename, seckeyfilename,

501

(mc.cred, pubkeyfilename, seckeyfilename,

542

502

GNUTLS_OPENPGP_FMT_BASE64);

543

503

if(ret != GNUTLS_E_SUCCESS){

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));

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

549

509

goto globalfail;

550

510

}

551

511

552

512

/* GnuTLS server initialization */

553

ret = gnutls_dh_params_init(&mc->dh_params);

513

ret = gnutls_dh_params_init(&mc.dh_params);

554

514

if(ret != GNUTLS_E_SUCCESS){

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

515

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

516

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

558

517

goto globalfail;

559

518

}

560

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

519

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

561

520

if(ret != GNUTLS_E_SUCCESS){

562

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

563

safer_gnutls_strerror(ret));

521

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

522

safer_gnutls_strerror(ret));

564

523

goto globalfail;

565

524

}

566

525

567

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

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

527

569

528

return 0;

570

529

571

530

globalfail:

572

531

573

gnutls_certificate_free_credentials(mc->cred);

532

gnutls_certificate_free_credentials(mc.cred);

574

533

gnutls_global_deinit();

575

gnutls_dh_params_deinit(mc->dh_params);

534

gnutls_dh_params_deinit(mc.dh_params);

576

535

return -1;

577

536

}

578

537

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

538

static int init_gnutls_session(gnutls_session_t *session){

582

539

int ret;

583

540

/* GnuTLS session creation */

584

541

do {

588

545

}

589

546

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

590

547

if(ret != GNUTLS_E_SUCCESS){

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

548

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

549

safer_gnutls_strerror(ret));

594

550

}

595

551

596

552

{

597

553

const char *err;

598

554

do {

599

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

555

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

600

556

if(quit_now){

601

557

gnutls_deinit(*session);

602

558

return -1;

603

559

}

604

560

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

605

561

if(ret != GNUTLS_E_SUCCESS){

606

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

607

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

608

safer_gnutls_strerror(ret));

562

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

563

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

564

safer_gnutls_strerror(ret));

609

565

gnutls_deinit(*session);

610

566

return -1;

611

567

}

613

569

614

570

do {

615

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

616

mc->cred);

572

mc.cred);

617

573

if(quit_now){

618

574

gnutls_deinit(*session);

619

575

return -1;

620

576

}

621

577

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

622

578

if(ret != GNUTLS_E_SUCCESS){

623

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

624

safer_gnutls_strerror(ret));

579

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

580

safer_gnutls_strerror(ret));

625

581

gnutls_deinit(*session);

626

582

return -1;

627

583

}

629

585

/* ignore client certificate if any. */

630

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

631

587

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

589

634

590

return 0;

635

591

}

639

595

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

640

596

641

597

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

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

598

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

644

599

AvahiIfIndex if_index,

645

int af, mandos_context *mc){

600

int af){

646

601

int ret, tcp_sd = -1;

647

602

ssize_t sret;

648

struct sockaddr_storage to;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

649

607

char *buffer = NULL;

650

608

char *decrypted_buffer = NULL;

651

609

size_t buffer_length = 0;

670

628

pf = PF_INET;

671

629

break;

672

630

default:

673

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

631

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

674

632

errno = EINVAL;

675

633

return -1;

676

634

}

677

635

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

ret = init_gnutls_session(&session);

711

637

if(ret != 0){

712

638

return -1;

713

639

}

714

640

715

641

if(debug){

716

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

717

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

642

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

643

"\n", ip, port);

718

644

}

719

645

720

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

732

658

733

659

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

734

660

if(af == AF_INET6){

735

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

736

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

661

to.in6.sin6_family = (sa_family_t)af;

662

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

737

663

} else { /* IPv4 */

738

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

739

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

664

to.in.sin_family = (sa_family_t)af;

665

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

740

666

}

741

667

if(ret < 0 ){

742

668

int e = errno;

746

672

}

747

673

if(ret == 0){

748

674

int e = errno;

749

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

675

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

750

676

errno = e;

751

677

goto mandos_end;

752

678

}

753

679

if(af == AF_INET6){

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

757

687

if(if_index == AVAHI_IF_UNSPEC){

758

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

759

" incomplete without a network interface\n");

688

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

689

" without a network interface\n");

760

690

errno = EINVAL;

761

691

goto mandos_end;

762

692

}

763

693

/* Set the network interface number as scope */

764

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

694

to.in6.sin6_scope_id = (uint32_t)if_index;

765

695

}

766

696

} else {

767

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

697

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

698

-Wconversion and

699

-Wunreachable-code */

768

700

}

769

701

770

702

if(quit_now){

778

710

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

779

711

perror_plus("if_indextoname");

780

712

} else {

781

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

782

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

713

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

714

ip, interface, port);

783

715

}

784

716

} else {

785

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

786

ip, (uintmax_t)port);

717

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

718

port);

787

719

}

788

720

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

721

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

722

const char *pcret;

790

723

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

724

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

725

sizeof(addrstr));

795

726

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

727

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

728

sizeof(addrstr));

800

729

}

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);

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

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

734

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

735

}

807

736

}

808

737

}

809

738

813

742

}

814

743

815

744

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

745

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

818

746

} else {

819

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

820

sizeof(struct sockaddr_in));

747

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

821

748

}

822

749

if(ret < 0){

823

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

750

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

824

751

int e = errno;

825

752

perror_plus("connect");

826

753

errno = e;

838

765

while(true){

839

766

size_t out_size = strlen(out);

840

767

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

841

out_size - written));

768

out_size - written));

842

769

if(ret == -1){

843

770

int e = errno;

844

771

perror_plus("write");

864

791

}

865

792

866

793

if(debug){

867

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

794

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

868

795

}

869

796

870

797

if(quit_now){

872

799

goto mandos_end;

873

800

}

874

801

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);

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

880

804

881

805

if(quit_now){

882

806

errno = EINTR;

893

817

894

818

if(ret != GNUTLS_E_SUCCESS){

895

819

if(debug){

896

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

820

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

897

821

gnutls_perror(ret);

898

822

}

899

823

errno = EPROTO;

903

827

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

904

828

905

829

if(debug){

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

830

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

831

ip);

908

832

}

909

833

910

834

while(true){

915

839

}

916

840

917

841

buffer_capacity = incbuffer(&buffer, buffer_length,

918

buffer_capacity);

842

buffer_capacity);

919

843

if(buffer_capacity == 0){

920

844

int e = errno;

921

845

perror_plus("incbuffer");

948

872

}

949

873

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

950

874

if(ret < 0){

951

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

952

"***\n");

875

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

953

876

gnutls_perror(ret);

954

877

errno = EPROTO;

955

878

goto mandos_end;

956

879

}

957

880

break;

958

881

default:

959

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

960

" encrypted session with Mandos server\n");

882

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

883

" encrypted session with Mandos server\n");

961

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

962

885

errno = EIO;

963

886

goto mandos_end;

968

891

}

969

892

970

893

if(debug){

971

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

894

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

972

895

}

973

896

974

897

if(quit_now){

986

909

987

910

if(buffer_length > 0){

988

911

ssize_t decrypted_buffer_size;

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

991

915

if(decrypted_buffer_size >= 0){

992

916

993

917

written = 0;

1003

927

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

1004

928

int e = errno;

1005

929

if(debug){

1006

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

1007

strerror(errno));

930

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

931

strerror(errno));

1008

932

}

1009

933

errno = e;

1010

934

goto mandos_end;

1041

965

return retval;

1042

966

}

1043

967

1044

__attribute__((nonnull))

1045

968

static void resolve_callback(AvahiSServiceResolver *r,

1046

969

AvahiIfIndex interface,

1047

970

AvahiProtocol proto,

1055

978

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

979

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

980

flags,

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1062

983

1063

984

/* Called whenever a service has been resolved successfully or

1064

985

timed out */

1070

991

switch(event){

1071

992

default:

1072

993

case AVAHI_RESOLVER_FAILURE:

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)));

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1078

997

break;

1079

998

1080

999

case AVAHI_RESOLVER_FOUND:

1082

1001

char ip[AVAHI_ADDRESS_STR_MAX];

1083

1002

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

1084

1003

if(debug){

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);

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1088

1007

}

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1093

1010

if(ret == 0){

1094

avahi_simple_poll_quit(simple_poll);

1011

avahi_simple_poll_quit(mc.simple_poll);

1095

1012

} else {

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1102

1015

}

1103

1016

}

1104

1017

}

1114

1027

const char *domain,

1115

1028

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1029

flags,

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1121

1032

1122

1033

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

1123

1034

is removed from the LAN */

1130

1041

default:

1131

1042

case AVAHI_BROWSER_FAILURE:

1132

1043

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);

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1137

1047

return;

1138

1048

1139

1049

case AVAHI_BROWSER_NEW:

1142

1052

the callback function is called the Avahi server will free the

1143

1053

resolver for us. */

1144

1054

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)));

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1153

1060

break;

1154

1061

1155

1062

case AVAHI_BROWSER_REMOVE:

1158

1065

case AVAHI_BROWSER_ALL_FOR_NOW:

1159

1066

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1160

1067

if(debug){

1161

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

1162

" searching...\n");

1068

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

1163

1069

}

1164

1070

break;

1165

1071

}

1174

1080

signal_received = sig;

1175

1081

int old_errno = errno;

1176

1082

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1179

1085

}

1180

1086

errno = old_errno;

1181

1087

}

1182

1088

1183

__attribute__((nonnull, warn_unused_result))

1184

1089

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

1185

1090

int ret;

1186

error_t ret_errno;

1187

1091

1188

1092

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

1189

1093

if(s < 0){

1190

ret_errno = errno;

1191

1094

perror_plus("socket");

1192

errno = ret_errno;

1193

1095

return false;

1194

1096

}

1195

1097

strcpy(ifr->ifr_name, ifname);

1196

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

1099

if(ret == -1){

1198

1100

if(debug){

1199

ret_errno = errno;

1200

1101

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1202

1102

}

1203

1103

return false;

1204

1104

}

1205

1105

return true;

1206

1106

}

1207

1107

1208

__attribute__((nonnull, warn_unused_result))

1209

1108

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

1210

1109

1211

1110

/* Reject the loopback device */

1212

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1213

1112

if(debug){

1214

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

1215

ifname);

1113

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

1114

ifname);

1216

1115

}

1217

1116

return false;

1218

1117

}

1219

1118

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

1220

1119

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

1221

1120

if(debug){

1222

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

1223

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

1121

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

1122

ifname);

1224

1123

}

1225

1124

return true;

1226

1125

}

1227

1126

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

1228

1127

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

1229

1128

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1129

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

1130

ifname);

1232

1131

}

1233

1132

return false;

1234

1133

}

1235

1134

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

1236

1135

if(ifr->ifr_flags & IFF_NOARP){

1237

1136

if(debug){

1238

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

1239

ifname);

1137

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

1240

1138

}

1241

1139

return false;

1242

1140

}

1243

1141

1244

1142

/* Accept this device */

1245

1143

if(debug){

1246

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

1144

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

1247

1145

}

1248

1146

return true;

1249

1147

}

1253

1151

* corresponds to an acceptable network device.

1254

1152

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

1255

1153

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1154

int good_interface(const struct dirent *if_entry){

1258

1155

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

1259

1156

return 0;

1262

1159

struct ifreq ifr;

1263

1160

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

1264

1161

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1273

}

1274

return 1;

1275

}

1276

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1162

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

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1312

1217

int notdotentries(const struct dirent *direntry){

1313

1218

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

1314

1219

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

1321

1226

}

1322

1227

1323

1228

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1229

int runnable_hook(const struct dirent *direntry){

1326

1230

int ret;

1327

size_t sret;

1328

1231

struct stat st;

1329

1232

1330

1233

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

1332

1235

return 0;

1333

1236

}

1334

1237

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);

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

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

1356

1255

if(ret == -1){

1357

1256

if(debug){

1358

perror_plus("Could not stat hook");

1257

perror_plus("Could not stat plugin");

1359

1258

}

1360

1259

return 0;

1361

1260

}

1362

1261

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

1363

1262

/* Not a regular file */

1364

if(debug){

1365

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

1366

direntry->d_name);

1367

}

1368

1263

return 0;

1369

1264

}

1370

1265

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

1371

1266

/* Not executable */

1372

if(debug){

1373

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

1374

direntry->d_name);

1375

}

1376

1267

return 0;

1377

1268

}

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

1269

return 1;

1383

1270

}

1384

1271

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1388

1273

int ret;

1389

1274

struct timespec now;

1390

1275

struct timespec waited_time;

1391

1276

intmax_t block_time;

1392

1277

1393

1278

while(true){

1394

if(mc->current_server == NULL){

1395

if(debug){

1396

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

1397

" No timeout!\n");

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1398

1283

}

1399

1284

ret = avahi_simple_poll_iterate(s, -1);

1400

1285

} else {

1401

if(debug){

1402

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

1403

" it, or wait\n");

1286

if (debug){

1287

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

1288

" or wait\n");

1404

1289

}

1405

1290

/* the current time */

1406

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1411

1296

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

1412

1297

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

1413

1298

waited_time.tv_sec = (now.tv_sec

1414

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

1299

- mc.current_server->last_seen.tv_sec);

1415

1300

waited_time.tv_nsec = (now.tv_nsec

1416

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

1301

- mc.current_server->last_seen.tv_nsec);

1417

1302

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

1418

1303

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

1419

1304

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

1421

1306

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

1422

1307

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

1423

1308

1424

if(debug){

1425

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

1426

block_time);

1309

if (debug){

1310

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

1427

1311

}

1428

1312

1429

1313

if(block_time <= 0){

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1434

1318

if(ret == 0){

1435

avahi_simple_poll_quit(s);

1319

avahi_simple_poll_quit(mc.simple_poll);

1436

1320

return 0;

1437

1321

}

1438

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1439

&mc->current_server->last_seen);

1323

&mc.current_server->last_seen);

1440

1324

if(ret == -1){

1441

1325

perror_plus("clock_gettime");

1442

1326

return -1;

1443

1327

}

1444

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

1328

mc.current_server = mc.current_server->next;

1445

1329

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

1446

1330

servers, but don't block */

1447

1331

}

1449

1333

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

1450

1334

}

1451

1335

if(ret != 0){

1452

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

1336

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

1453

1337

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

1454

1338

}

1455

1339

}

1456

1340

}

1457

1341

}

1458

1342

1459

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

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

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

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

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

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

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

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

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

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

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

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1515

__attribute__((nonnull))

1516

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

1517

const float delay){

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1521

if(numhooks == -1){

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

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

1534

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

1535

direntry = direntries[i];

1536

char *fullname = NULL;

1537

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

1538

if(ret < 0){

1539

perror_plus("asprintf");

1540

continue;

1541

}

1542

if(debug){

1543

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

1544

direntry->d_name);

1545

}

1546

pid_t hook_pid = fork();

1547

if(hook_pid == 0){

1548

/* Child */

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1583

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

1584

if(ret == -1){

1585

perror_plus("setenv");

1586

_exit(EX_OSERR);

1587

}

1588

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

1589

if(ret == -1){

1590

perror_plus("setenv");

1591

_exit(EX_OSERR);

1592

}

1593

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

1594

if(ret == -1){

1595

perror_plus("setenv");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

char *delaystring;

1604

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

1605

if(ret == -1){

1606

perror_plus("asprintf");

1607

_exit(EX_OSERR);

1608

}

1609

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

1610

if(ret == -1){

1611

free(delaystring);

1612

perror_plus("setenv");

1613

_exit(EX_OSERR);

1614

}

1615

free(delaystring);

1616

if(connect_to != NULL){

1617

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

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

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

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

1627

} else {

1628

int status;

1629

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

1630

perror_plus("waitpid");

1631

free(fullname);

1632

continue;

1633

}

1634

if(WIFEXITED(status)){

1635

if(WEXITSTATUS(status) != 0){

1636

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

1637

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

1638

WEXITSTATUS(status));

1639

free(fullname);

1640

continue;

1641

}

1642

} else if(WIFSIGNALED(status)){

1643

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

1644

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

1645

WTERMSIG(status));

1646

free(fullname);

1647

continue;

1648

} else {

1649

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

1650

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

1651

free(fullname);

1652

continue;

1653

}

1654

}

1655

free(fullname);

1656

if(debug){

1657

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

1658

direntry->d_name);

1659

}

1660

}

1661

close(devnull);

1662

}

1663

}

1664

1665

__attribute__((nonnull, warn_unused_result))

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

1669

int ret;

1670

struct ifreq network;

1671

unsigned int if_index = if_nametoindex(interface);

1672

if(if_index == 0){

1673

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

1674

errno = old_errno;

1675

return ENXIO;

1676

}

1677

1678

if(quit_now){

1679

errno = old_errno;

1680

return EINTR;

1681

}

1682

1683

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1686

ret_errno = errno;

1687

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

1688

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

1689

errno = old_errno;

1690

return ret_errno;

1691

}

1692

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

1693

1694

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

1695

if(sd == -1){

1696

ret_errno = errno;

1697

perror_plus("socket");

1698

errno = old_errno;

1699

return ret_errno;

1700

}

1701

1702

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1707

errno = old_errno;

1708

return EINTR;

1709

}

1710

1711

if(debug){

1712

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

1713

interface);

1714

}

1715

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

if(ret_errno != 0){

1719

perror_plus("Failed to raise privileges");

1720

}

1721

1722

#ifdef __linux__

1723

int ret_linux;

1724

bool restore_loglevel = false;

1725

if(ret_errno == 0){

1726

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1727

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

1728

ret_linux = klogctl(8, NULL, 5);

1729

if(ret_linux == -1){

1730

perror_plus("klogctl");

1731

} else {

1732

restore_loglevel = true;

1733

}

1734

}

1735

#endif /* __linux__ */

1736

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

1737

ioctl_errno = errno;

1738

#ifdef __linux__

1739

if(restore_loglevel){

1740

ret_linux = klogctl(7, NULL, 0);

1741

if(ret_linux == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

1747

/* If raise_privileges() succeeded above */

1748

if(ret_errno == 0){

1749

/* Lower privileges */

1750

ret_errno = lower_privileges();

1751

if(ret_errno != 0){

1752

errno = ret_errno;

1753

perror_plus("Failed to lower privileges");

1754

}

1755

}

1756

1757

/* Close the socket */

1758

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

1759

if(ret == -1){

1760

perror_plus("close");

1761

}

1762

1763

if(ret_setflags == -1){

1764

errno = ioctl_errno;

1765

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1766

errno = old_errno;

1767

return ioctl_errno;

1768

}

1769

} else if(debug){

1770

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

1771

interface);

1772

}

1773

1774

/* Sleep checking until interface is running.

1775

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

1776

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

1777

if(interface_is_running(interface)){

1778

break;

1779

}

1780

struct timespec sleeptime = { .tv_nsec = 250000000 };

1781

ret = nanosleep(&sleeptime, NULL);

1782

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

1783

perror_plus("nanosleep");

1784

}

1785

}

1786

1787

errno = old_errno;

1788

return 0;

1789

}

1790

1791

__attribute__((nonnull, warn_unused_result))

1792

error_t take_down_interface(const char *const interface){

1793

error_t old_errno = errno;

1794

struct ifreq network;

1795

unsigned int if_index = if_nametoindex(interface);

1796

if(if_index == 0){

1797

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

1798

errno = old_errno;

1799

return ENXIO;

1800

}

1801

if(interface_is_up(interface)){

1802

error_t ret_errno = 0, ioctl_errno = 0;

1803

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

1804

ret_errno = errno;

1805

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

1806

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

1807

errno = old_errno;

1808

return ret_errno;

1809

}

1810

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

1811

1812

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

1813

if(sd == -1){

1814

ret_errno = errno;

1815

perror_plus("socket");

1816

errno = old_errno;

1817

return ret_errno;

1818

}

1819

1820

if(debug){

1821

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

1822

interface);

1823

}

1824

1825

/* Raise privileges */

1826

ret_errno = raise_privileges();

1827

if(ret_errno != 0){

1828

perror_plus("Failed to raise privileges");

1829

}

1830

1831

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

1832

ioctl_errno = errno;

1833

1834

/* If raise_privileges() succeeded above */

1835

if(ret_errno == 0){

1836

/* Lower privileges */

1837

ret_errno = lower_privileges();

1838

if(ret_errno != 0){

1839

errno = ret_errno;

1840

perror_plus("Failed to lower privileges");

1841

}

1842

}

1843

1844

/* Close the socket */

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1849

1850

if(ret_setflags == -1){

1851

errno = ioctl_errno;

1852

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1853

errno = old_errno;

1854

return ioctl_errno;

1855

}

1856

} else if(debug){

1857

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

1858

interface);

1859

}

1860

1861

errno = old_errno;

1862

return 0;

1863

}

1864

1865

1343

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

1866

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

1867

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

1868

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

1869

.interfaces = NULL, .interfaces_size = 0 };

1870

1344

AvahiSServiceBrowser *sb = NULL;

1871

error_t ret_errno;

1345

int error;

1872

1346

int ret;

1873

1347

intmax_t tmpmax;

1874

1348

char *tmp;

1875

1349

int exitcode = EXIT_SUCCESS;

1876

char *interfaces_to_take_down = NULL;

1877

size_t interfaces_to_take_down_size = 0;

1878

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

1879

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

1880

char *tempdir = NULL;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1356

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

1357

bool tempdir_created = false;

1881

1358

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1882

1359

const char *seckey = PATHDIR "/" SECKEY;

1883

1360

const char *pubkey = PATHDIR "/" PUBKEY;

1884

char *interfaces_hooks = NULL;

1885

1361

1886

1362

bool gnutls_initialized = false;

1887

1363

bool gpgme_initialized = false;

1949

1425

.group = 2 },

1950

1426

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

1951

1427

.arg = "SECONDS",

1952

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

1953

.group = 2 },

1954

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

1955

.arg = "DIR",

1956

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

1428

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

1957

1429

.group = 2 },

1958

1430

/*

1959

1431

* These reproduce what we would get without ARGP_NO_HELP

1978

1450

connect_to = arg;

1979

1451

break;

1980

1452

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

1981

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

1982

arg, (int)',');

1983

if(ret_errno != 0){

1984

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

1985

}

1453

interface = arg;

1986

1454

break;

1987

1455

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

1988

1456

seckey = arg;

2017

1485

argp_error(state, "Bad retry interval");

2018

1486

}

2019

1487

break;

2020

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

2021

hookdir = arg;

2022

break;

2023

1488

/*

2024

1489

* These reproduce what we would get without ARGP_NO_HELP

2025

1490

*/

2031

1496

argp_state_help(state, state->out_stream,

2032

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2033

1498

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

2034

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

1499

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

2035

1500

exit(argp_err_exit_status);

2036

1501

break;

2037

1502

default:

2064

1529

{

2065

1530

/* Work around Debian bug #633582:

2066

1531

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

2067

2068

/* Re-raise privileges */

2069

ret_errno = raise_privileges();

2070

if(ret_errno != 0){

2071

errno = ret_errno;

2072

perror_plus("Failed to raise privileges");

2073

} else {

2074

struct stat st;

2075

2076

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

2077

int seckey_fd = open(seckey, O_RDONLY);

2078

if(seckey_fd == -1){

2079

perror_plus("open");

2080

} else {

2081

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

2082

if(ret == -1){

2083

perror_plus("fstat");

2084

} else {

2085

if(S_ISREG(st.st_mode)

2086

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

2087

ret = fchown(seckey_fd, uid, gid);

2088

if(ret == -1){

2089

perror_plus("fchown");

2090

}

2091

}

2092

}

2093

TEMP_FAILURE_RETRY(close(seckey_fd));

2094

}

2095

}

2096

2097

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

2098

int pubkey_fd = open(pubkey, O_RDONLY);

2099

if(pubkey_fd == -1){

2100

perror_plus("open");

2101

} else {

2102

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

2103

if(ret == -1){

2104

perror_plus("fstat");

2105

} else {

2106

if(S_ISREG(st.st_mode)

2107

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

2108

ret = fchown(pubkey_fd, uid, gid);

2109

if(ret == -1){

2110

perror_plus("fchown");

2111

}

2112

}

2113

}

2114

TEMP_FAILURE_RETRY(close(pubkey_fd));

2115

}

2116

}

2117

2118

/* Lower privileges */

2119

ret_errno = lower_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to lower privileges");

2123

}

2124

}

2125

}

2126

2127

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

2128

{

2129

char *interface = NULL;

2130

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

2131

interface))){

2132

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

2133

and if_nametoindex(interface) == 0){

2134

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

2135

fprintf_plus(stderr, "Not using nonexisting interface"

2136

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

2137

}

2138

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

2139

interface = NULL;

2140

}

2141

}

2142

}

2143

2144

/* Run network hooks */

2145

{

2146

if(mc.interfaces != NULL){

2147

interfaces_hooks = malloc(mc.interfaces_size);

2148

if(interfaces_hooks == NULL){

2149

perror_plus("malloc");

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

2150

1644

goto end;

2151

1645

}

2152

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

2153

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

2154

1646

}

2155

run_network_hooks("start", interfaces_hooks != NULL ?

2156

interfaces_hooks : "", delay);

1647

close(devnull);

2157

1648

}

2158

1649

2159

1650

if(not debug){

2160

1651

avahi_set_log_function(empty_log);

2161

1652

}

2162

1653

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

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

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

2163

1686

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

2164

1687

from the signal handler */

2165

1688

/* Initialize the pseudo-RNG for Avahi */

2166

1689

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

2167

simple_poll = avahi_simple_poll_new();

2168

if(simple_poll == NULL){

2169

fprintf_plus(stderr,

2170

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

1690

mc.simple_poll = avahi_simple_poll_new();

1691

if(mc.simple_poll == NULL){

1692

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

2171

1693

exitcode = EX_UNAVAILABLE;

2172

1694

goto end;

2173

1695

}

2235

1757

}

2236

1758

}

2237

1759

2238

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

2239

if(mc.interfaces == NULL){

2240

struct dirent **direntries;

2241

/* Look for any good interfaces */

2242

ret = scandir(sys_class_net, &direntries, good_interface,

2243

alphasort);

2244

if(ret >= 1){

2245

/* Add all found interfaces to interfaces list */

2246

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

2247

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

2248

direntries[i]->d_name);

2249

if(ret_errno != 0){

2250

errno = ret_errno;

2251

perror_plus("argz_add");

2252

continue;

2253

}

2254

if(debug){

2255

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

2256

direntries[i]->d_name);

2257

}

2258

}

2259

free(direntries);

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

1845

}

1846

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

1864

break;

1865

}

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

2260

1896

} else {

2261

free(direntries);

2262

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

2263

exitcode = EXIT_FAILURE;

2264

goto end;

2265

}

2266

}

2267

2268

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

2269

{

2270

char *interface = NULL;

2271

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

2272

interface))){

2273

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

2274

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

2275

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

2276

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

2277

interface);

2278

interface = NULL;

2279

while((interface = argz_next(mc.interfaces,

2280

mc.interfaces_size, interface))){

2281

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

2282

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

2283

interface);

2284

interface = NULL;

2285

}

2286

}

2287

break;

2288

}

2289

bool interface_was_up = interface_is_up(interface);

2290

errno = bring_up_interface(interface, delay);

2291

if(not interface_was_up){

2292

if(errno != 0){

2293

perror_plus("Failed to bring up interface");

2294

} else {

2295

errno = argz_add(&interfaces_to_take_down,

2296

&interfaces_to_take_down_size,

2297

interface);

2298

if(errno != 0){

2299

perror_plus("argz_add");

2300

}

2301

}

2302

}

2303

}

2304

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

2305

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

2306

}

2307

}

2308

2309

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

2310

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

2311

if(debug){

2312

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

2313

mc.interfaces);

2314

}

2315

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

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

2316

1903

}

2317

1904

2318

1905

if(quit_now){

2319

1906

goto end;

2320

1907

}

2321

1908

2322

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

1909

ret = init_gnutls_global(pubkey, seckey);

2323

1910

if(ret == -1){

2324

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

1911

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

2325

1912

exitcode = EX_UNAVAILABLE;

2326

1913

goto end;

2327

1914

} else {

2332

1919

goto end;

2333

1920

}

2334

1921

2335

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

2336

tempdir = mkdtemp(run_tempdir);

2337

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

2338

if(debug){

2339

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

2340

run_tempdir, old_tempdir);

2341

}

2342

tempdir = mkdtemp(old_tempdir);

2343

}

2344

if(tempdir == NULL){

1922

if(mkdtemp(tempdir) == NULL){

2345

1923

perror_plus("mkdtemp");

2346

1924

goto end;

2347

1925

}

1926

tempdir_created = true;

2348

1927

2349

1928

if(quit_now){

2350

1929

goto end;

2351

1930

}

2352

1931

2353

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

2354

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

1932

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

1933

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

2355

1934

exitcode = EX_UNAVAILABLE;

2356

1935

goto end;

2357

1936

} else {

2366

1945

/* Connect directly, do not use Zeroconf */

2367

1946

/* (Mainly meant for debugging) */

2368

1947

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

2369

2370

1948

if(address == NULL){

2371

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

1949

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

2372

1950

exitcode = EX_USAGE;

2373

1951

goto end;

2374

1952

}

2377

1955

goto end;

2378

1956

}

2379

1957

2380

in_port_t port;

1958

uint16_t port;

2381

1959

errno = 0;

2382

1960

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

2383

1961

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

2384

or tmpmax != (in_port_t)tmpmax){

2385

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

1962

or tmpmax != (uint16_t)tmpmax){

1963

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

2386

1964

exitcode = EX_USAGE;

2387

1965

goto end;

2388

1966

}

2389

1967

2390

1968

if(quit_now){

2391

1969

goto end;

2392

1970

}

2393

1971

2394

port = (in_port_t)tmpmax;

1972

port = (uint16_t)tmpmax;

2395

1973

*address = '\0';

2396

1974

/* Colon in address indicates IPv6 */

2397

1975

int af;

2413

1991

}

2414

1992

2415

1993

while(not quit_now){

2416

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

2417

&mc);

1994

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

2418

1995

if(quit_now or ret == 0){

2419

1996

break;

2420

1997

}

2421

1998

if(debug){

2422

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

2423

(int)retry_interval);

1999

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

2000

(int)retry_interval);

2424

2001

}

2425

sleep((unsigned int)retry_interval);

2002

sleep((int)retry_interval);

2426

2003

}

2427

2004

2428

if(not quit_now){

2005

if (not quit_now){

2429

2006

exitcode = EXIT_SUCCESS;

2430

2007

}

2431

2008

2446

2023

config.publish_domain = 0;

2447

2024

2448

2025

/* Allocate a new server */

2449

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2450

&config, NULL, NULL, &ret_errno);

2026

mc.server = avahi_server_new(avahi_simple_poll_get

2027

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2451

2029

2452

2030

/* Free the Avahi configuration data */

2453

2031

avahi_server_config_free(&config);

2455

2033

2456

2034

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

2457

2035

if(mc.server == NULL){

2458

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

2459

avahi_strerror(ret_errno));

2036

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

2037

avahi_strerror(error));

2460

2038

exitcode = EX_UNAVAILABLE;

2461

2039

goto end;

2462

2040

}

2468

2046

/* Create the Avahi service browser */

2469

2047

sb = avahi_s_service_browser_new(mc.server, if_index,

2470

2048

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2471

NULL, 0, browse_callback,

2472

(void *)&mc);

2049

NULL, 0, browse_callback, NULL);

2473

2050

if(sb == NULL){

2474

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

2475

avahi_strerror(avahi_server_errno(mc.server)));

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2476

2053

exitcode = EX_UNAVAILABLE;

2477

2054

goto end;

2478

2055

}

2484

2061

/* Run the main loop */

2485

2062

2486

2063

if(debug){

2487

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

2064

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

2488

2065

}

2489

2066

2490

ret = avahi_loop_with_timeout(simple_poll,

2491

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

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2492

2069

if(debug){

2493

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

2494

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

2070

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

2071

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

2495

2072

}

2496

2073

2497

2074

end:

2498

2075

2499

2076

if(debug){

2500

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

2077

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

2501

2078

}

2502

2079

2503

2080

/* Cleanup things */

2504

free(mc.interfaces);

2505

2506

2081

if(sb != NULL)

2507

2082

avahi_s_service_browser_free(sb);

2508

2083

2509

2084

if(mc.server != NULL)

2510

2085

avahi_server_free(mc.server);

2511

2086

2512

if(simple_poll != NULL)

2513

avahi_simple_poll_free(simple_poll);

2087

if(mc.simple_poll != NULL)

2088

avahi_simple_poll_free(mc.simple_poll);

2514

2089

2515

2090

if(gnutls_initialized){

2516

2091

gnutls_certificate_free_credentials(mc.cred);

2521

2096

if(gpgme_initialized){

2522

2097

gpgme_release(mc.ctx);

2523

2098

}

2524

2099

2525

2100

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

2526

2101

has seen */

2527

2102

if(mc.current_server != NULL){

2533

2108

}

2534

2109

}

2535

2110

2536

/* Re-raise privileges */

2537

{

2538

ret_errno = raise_privileges();

2539

if(ret_errno != 0){

2540

perror_plus("Failed to raise privileges");

2541

} else {

2542

2543

/* Run network hooks */

2544

run_network_hooks("stop", interfaces_hooks != NULL ?

2545

interfaces_hooks : "", delay);

2546

2547

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

2548

{

2549

char *interface = NULL;

2550

while((interface=argz_next(interfaces_to_take_down,

2551

interfaces_to_take_down_size,

2552

interface))){

2553

ret_errno = take_down_interface(interface);

2554

if(ret_errno != 0){

2555

errno = ret_errno;

2556

perror_plus("Failed to take down interface");

2557

}

2558

}

2559

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

2560

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

2561

" down\n");

2562

}

2563

}

2111

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

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2564

2120

}

2565

2566

ret_errno = lower_privileges_permanently();

2567

if(ret_errno != 0){

2568

perror_plus("Failed to lower privileges permanently");

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2130

}

2131

}

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2141

}

2569

2142

}

2570

2143

}

2571

2144

2572

free(interfaces_to_take_down);

2573

free(interfaces_hooks);

2574

2575

2145

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

2576

if(tempdir != NULL){

2146

if(tempdir_created){

2577

2147

struct dirent **direntries = NULL;

2578

2148

struct dirent *direntry = NULL;

2579

2149

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

2580

2150

alphasort);

2581

if(numentries > 0){

2151

if (numentries > 0){

2582

2152

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

2583

2153

direntry = direntries[i];

2584

2154

char *fullname = NULL;

2590

2160

}

2591

2161

ret = remove(fullname);

2592

2162

if(ret == -1){

2593

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

2594

strerror(errno));

2163

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

2164

strerror(errno));

2595

2165

}

2596

2166

free(fullname);

2597

2167

}

2599

2169

2600

2170

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

2601

2171

free(direntries);

2602

if(numentries == -1){

2172

if (numentries == -1){

2603

2173

perror_plus("scandir");

2604

2174

}

2605

2175

ret = rmdir(tempdir);