/mandos/release : revision 237.16.8

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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opendir(), DIR */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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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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unlinkat() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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

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if(buffer == NULL){

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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

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int af){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return false;

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return -1;

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}

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

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.port = port,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return false;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return false;

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return -1;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

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} else {

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

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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*/

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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

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const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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bool import_key(const char * const filename){

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bool import_key(const char *filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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"Initializing GPGME\n");

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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while(engine_info != NULL){

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engine_info = engine_info->next;

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}

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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, "Mandos plugin mandos-client: "

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

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return false;

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}

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/* Create new GPGME "context" */

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

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

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if(rc != GPG_ERR_NO_ERROR){

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

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

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gpgme_strerror(rc));

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

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

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gpgme_strerror(rc));

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return false;

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}

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* Decrypt OpenPGP data.

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* Returns -1 on error

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*/

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__attribute__((nonnull, warn_unused_result))

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

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size_t crypto_size,

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char **plaintext,

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mandos_context *mc){

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char **plaintext){

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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ssize_t ret;

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ssize_t plaintext_length = 0;

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if(debug){

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

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

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"Trying to decrypt OpenPGP data\n");

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}

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

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

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0);

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if(rc != GPG_ERR_NO_ERROR){

379

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

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}

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

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rc = gpgme_data_new(&dh_plain);

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if(rc != GPG_ERR_NO_ERROR){

387

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_data_release(dh_crypto);

391

366

return -1;

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}

393

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394

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

395

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data buffer */

396

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

371

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

397

372

if(rc != GPG_ERR_NO_ERROR){

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

373

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

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

401

377

if(debug){

402

378

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

379

result = gpgme_op_decrypt_result(mc.ctx);

404

380

if(result == NULL){

405

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

381

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

382

"gpgme_op_decrypt_result failed\n");

406

383

} else {

407

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

408

result->unsupported_algorithm);

409

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

410

result->wrong_key_usage);

384

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

385

"Unsupported algorithm: %s\n",

386

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

389

result->wrong_key_usage);

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390

if(result->file_name != NULL){

412

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

391

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

392

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

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393

}

414

394

gpgme_recipient_t recipient;

415

395

recipient = result->recipients;

416

396

while(recipient != NULL){

417

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

418

gpgme_pubkey_algo_name

419

(recipient->pubkey_algo));

420

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

421

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

422

recipient->status == GPG_ERR_NO_SECKEY

423

? "No" : "Yes");

397

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

398

"Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

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

402

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

403

"Secret key available: %s\n",

404

recipient->status == GPG_ERR_NO_SECKEY

405

? "No" : "Yes");

424

406

recipient = recipient->next;

425

407

}

426

408

}

429

411

}

430

412

431

413

if(debug){

432

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

433

416

}

434

417

435

418

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

466

449

}

467

450

468

451

if(debug){

469

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

452

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

453

"Decrypted password is: ");

470

454

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

471

455

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

472

456

}

483

467

return plaintext_length;

484

468

}

485

469

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

470

static const char * safer_gnutls_strerror(int value){

471

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

472

-Wunreachable-code */

489

473

if(ret == NULL)

490

474

ret = "(unknown)";

491

475

return ret;

492

476

}

493

477

494

478

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

479

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

497

480

const char* string){

498

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

481

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

499

482

}

500

483

501

__attribute__((nonnull, warn_unused_result))

502

484

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

485

const char *seckeyfilename){

505

486

int ret;

506

487

507

488

if(debug){

508

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

489

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

490

"Initializing GnuTLS\n");

509

491

}

510

492

511

493

ret = gnutls_global_init();

512

494

if(ret != GNUTLS_E_SUCCESS){

513

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

514

safer_gnutls_strerror(ret));

495

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

496

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

515

497

return -1;

516

498

}

517

499

524

506

}

525

507

526

508

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

528

510

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

511

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

512

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

531

513

gnutls_global_deinit();

532

514

return -1;

533

515

}

534

516

535

517

if(debug){

536

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

537

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

538

pubkeyfilename,

539

seckeyfilename);

518

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

519

"Attempting to use OpenPGP public key %s and"

520

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

521

seckeyfilename);

540

522

}

541

523

542

524

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

525

(mc.cred, pubkeyfilename, seckeyfilename,

544

526

GNUTLS_OPENPGP_FMT_BASE64);

545

527

if(ret != GNUTLS_E_SUCCESS){

546

fprintf_plus(stderr,

547

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

548

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

549

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

550

safer_gnutls_strerror(ret));

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

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

531

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

532

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

533

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

551

534

goto globalfail;

552

535

}

553

536

554

537

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

538

ret = gnutls_dh_params_init(&mc.dh_params);

556

539

if(ret != GNUTLS_E_SUCCESS){

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

" initialization: %s\n",

559

safer_gnutls_strerror(ret));

540

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

541

"Error in GnuTLS DH parameter initialization:"

542

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

560

543

goto globalfail;

561

544

}

562

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

545

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

563

546

if(ret != GNUTLS_E_SUCCESS){

564

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

565

safer_gnutls_strerror(ret));

547

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

548

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

549

safer_gnutls_strerror(ret));

566

550

goto globalfail;

567

551

}

568

552

569

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

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

554

571

555

return 0;

572

556

573

557

globalfail:

574

558

575

gnutls_certificate_free_credentials(mc->cred);

559

gnutls_certificate_free_credentials(mc.cred);

576

560

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

561

gnutls_dh_params_deinit(mc.dh_params);

578

562

return -1;

579

563

}

580

564

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

584

566

int ret;

585

567

/* GnuTLS session creation */

586

568

do {

590

572

}

591

573

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

592

574

if(ret != GNUTLS_E_SUCCESS){

593

fprintf_plus(stderr,

594

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

595

safer_gnutls_strerror(ret));

575

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

576

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

577

safer_gnutls_strerror(ret));

596

578

}

597

579

598

580

{

599

581

const char *err;

600

582

do {

601

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

583

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

602

584

if(quit_now){

603

585

gnutls_deinit(*session);

604

586

return -1;

605

587

}

606

588

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

607

589

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

610

safer_gnutls_strerror(ret));

590

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

591

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

592

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

593

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

611

594

gnutls_deinit(*session);

612

595

return -1;

613

596

}

615

598

616

599

do {

617

600

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

601

mc.cred);

619

602

if(quit_now){

620

603

gnutls_deinit(*session);

621

604

return -1;

622

605

}

623

606

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

624

607

if(ret != GNUTLS_E_SUCCESS){

625

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

626

safer_gnutls_strerror(ret));

608

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

609

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

610

safer_gnutls_strerror(ret));

627

611

gnutls_deinit(*session);

628

612

return -1;

629

613

}

631

615

/* ignore client certificate if any. */

632

616

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

617

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

618

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

619

636

620

return 0;

637

621

}

641

625

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

642

626

643

627

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

628

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

646

629

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

630

int af){

648

631

int ret, tcp_sd = -1;

649

632

ssize_t sret;

650

struct sockaddr_storage to;

633

union {

634

struct sockaddr_in in;

635

struct sockaddr_in6 in6;

636

} to;

651

637

char *buffer = NULL;

652

638

char *decrypted_buffer = NULL;

653

639

size_t buffer_length = 0;

672

658

pf = PF_INET;

673

659

break;

674

660

default:

675

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

661

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

662

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

676

663

errno = EINVAL;

677

664

return -1;

678

665

}

679

666

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

667

ret = init_gnutls_session(&session);

713

668

if(ret != 0){

714

669

return -1;

715

670

}

716

671

717

672

if(debug){

718

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

719

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

673

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

674

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

675

"\n", ip, port);

720

676

}

721

677

722

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

734

690

735

691

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

736

692

if(af == AF_INET6){

737

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

738

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

693

to.in6.sin6_family = (sa_family_t)af;

694

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

739

695

} else { /* IPv4 */

740

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

741

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

696

to.in.sin_family = (sa_family_t)af;

697

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

742

698

}

743

699

if(ret < 0 ){

744

700

int e = errno;

748

704

}

749

705

if(ret == 0){

750

706

int e = errno;

751

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

707

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

708

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

752

709

errno = e;

753

710

goto mandos_end;

754

711

}

755

712

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

713

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

714

-Wconversion and

715

-Wunreachable-code */

716

717

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

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

719

-Wunreachable-code*/

759

720

if(if_index == AVAHI_IF_UNSPEC){

760

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

761

" incomplete without a network interface\n");

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

762

724

errno = EINVAL;

763

725

goto mandos_end;

764

726

}

765

727

/* Set the network interface number as scope */

766

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

728

to.in6.sin6_scope_id = (uint32_t)if_index;

767

729

}

768

730

} else {

769

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

731

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

732

-Wconversion and

733

-Wunreachable-code */

770

734

}

771

735

772

736

if(quit_now){

780

744

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

781

745

perror_plus("if_indextoname");

782

746

} else {

783

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

784

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

747

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

748

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

749

ip, interface, port);

785

750

}

786

751

} else {

787

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

788

ip, (uintmax_t)port);

752

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

753

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

789

754

}

790

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

757

const char *pcret;

792

758

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

759

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

760

sizeof(addrstr));

797

761

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

762

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

763

sizeof(addrstr));

802

764

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

765

if(pcret == NULL){

766

perror_plus("inet_ntop");

767

} else {

768

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

769

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

770

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

771

}

809

772

}

810

773

}

811

774

815

778

}

816

779

817

780

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

781

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

820

782

} else {

821

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

822

sizeof(struct sockaddr_in));

783

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

823

784

}

824

785

if(ret < 0){

825

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

786

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

826

787

int e = errno;

827

788

perror_plus("connect");

828

789

errno = e;

866

827

}

867

828

868

829

if(debug){

869

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

830

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

831

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

870

832

}

871

833

872

834

if(quit_now){

874

836

goto mandos_end;

875

837

}

876

838

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

839

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

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

841

883

842

if(quit_now){

884

843

errno = EINTR;

895

854

896

855

if(ret != GNUTLS_E_SUCCESS){

897

856

if(debug){

898

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

857

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

858

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

899

859

gnutls_perror(ret);

900

860

}

901

861

errno = EPROTO;

905

865

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

906

866

907

867

if(debug){

908

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

909

" %s\n", ip);

868

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

869

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

910

870

}

911

871

912

872

while(true){

950

910

}

951

911

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

952

912

if(ret < 0){

953

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

954

"***\n");

913

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

914

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

955

915

gnutls_perror(ret);

956

916

errno = EPROTO;

957

917

goto mandos_end;

958

918

}

959

919

break;

960

920

default:

961

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

962

" encrypted session with Mandos server\n");

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

963

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

964

925

errno = EIO;

965

926

goto mandos_end;

970

931

}

971

932

972

933

if(debug){

973

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

934

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

935

"Closing TLS session\n");

974

936

}

975

937

976

938

if(quit_now){

989

951

if(buffer_length > 0){

990

952

ssize_t decrypted_buffer_size;

991

953

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

954

&decrypted_buffer);

993

955

if(decrypted_buffer_size >= 0){

994

956

995

957

written = 0;

1005

967

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

1006

968

int e = errno;

1007

969

if(debug){

1008

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

1009

strerror(errno));

970

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

971

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

972

strerror(errno));

1010

973

}

1011

974

errno = e;

1012

975

goto mandos_end;

1043

1006

return retval;

1044

1007

}

1045

1008

1046

__attribute__((nonnull))

1047

1009

static void resolve_callback(AvahiSServiceResolver *r,

1048

1010

AvahiIfIndex interface,

1049

1011

AvahiProtocol proto,

1057

1019

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

1020

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

1021

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1022

AVAHI_GCC_UNUSED void* userdata){

1023

assert(r);

1064

1024

1065

1025

/* Called whenever a service has been resolved successfully or

1066

1026

timed out */

1072

1032

switch(event){

1073

1033

default:

1074

1034

case AVAHI_RESOLVER_FAILURE:

1075

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

1076

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

1077

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

1035

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

1036

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

1037

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

1038

avahi_strerror(avahi_server_errno(mc.server)));

1080

1039

break;

1081

1040

1082

1041

case AVAHI_RESOLVER_FOUND:

1084

1043

char ip[AVAHI_ADDRESS_STR_MAX];

1085

1044

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

1086

1045

if(debug){

1087

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

1088

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

1089

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

1046

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

1047

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

1048

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

1049

ip, (intmax_t)interface, port);

1090

1050

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1051

int ret = start_mandos_communication(ip, port, interface,

1052

avahi_proto_to_af(proto));

1095

1053

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1054

avahi_simple_poll_quit(mc.simple_poll);

1097

1055

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1101

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

1102

" list\n", name);

1103

}

1056

ret = add_server(ip, port, interface,

1057

avahi_proto_to_af(proto));

1104

1058

}

1105

1059

}

1106

1060

}

1116

1070

const char *domain,

1117

1071

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1072

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1073

AVAHI_GCC_UNUSED void* userdata){

1074

assert(b);

1123

1075

1124

1076

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

1125

1077

is removed from the LAN */

1132

1084

default:

1133

1085

case AVAHI_BROWSER_FAILURE:

1134

1086

1135

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1087

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

1088

"(Avahi browser) %s\n",

1089

avahi_strerror(avahi_server_errno(mc.server)));

1090

avahi_simple_poll_quit(mc.simple_poll);

1139

1091

return;

1140

1092

1141

1093

case AVAHI_BROWSER_NEW:

1144

1096

the callback function is called the Avahi server will free the

1145

1097

resolver for us. */

1146

1098

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1151

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

1152

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

1099

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

1100

name, type, domain, protocol, 0,

1101

resolve_callback, NULL) == NULL)

1102

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

1103

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

1104

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

1155

1105

break;

1156

1106

1157

1107

case AVAHI_BROWSER_REMOVE:

1160

1110

case AVAHI_BROWSER_ALL_FOR_NOW:

1161

1111

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1162

1112

if(debug){

1163

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

1164

" searching...\n");

1113

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

1114

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

1165

1115

}

1166

1116

break;

1167

1117

}

1176

1126

signal_received = sig;

1177

1127

int old_errno = errno;

1178

1128

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1129

if(mc.simple_poll != NULL){

1130

avahi_simple_poll_quit(mc.simple_poll);

1181

1131

}

1182

1132

errno = old_errno;

1183

1133

}

1184

1134

1185

__attribute__((nonnull, warn_unused_result))

1186

1135

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

1187

1136

int ret;

1188

error_t ret_errno;

1189

1137

1190

1138

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

1191

1139

if(s < 0){

1192

ret_errno = errno;

1193

1140

perror_plus("socket");

1194

errno = ret_errno;

1195

1141

return false;

1196

1142

}

1197

1143

strcpy(ifr->ifr_name, ifname);

1198

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1145

if(ret == -1){

1200

1146

if(debug){

1201

ret_errno = errno;

1202

1147

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

1148

}

1205

1149

return false;

1206

1150

}

1207

1151

return true;

1208

1152

}

1209

1153

1210

__attribute__((nonnull, warn_unused_result))

1211

1154

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

1212

1155

1213

1156

/* Reject the loopback device */

1214

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1215

1158

if(debug){

1216

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

1217

ifname);

1159

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

1160

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

1218

1161

}

1219

1162

return false;

1220

1163

}

1221

1164

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

1222

1165

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

1223

1166

if(debug){

1224

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

1225

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

1167

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

1168

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

1226

1169

}

1227

1170

return true;

1228

1171

}

1229

1172

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

1230

1173

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

1231

1174

if(debug){

1232

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1233

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

1175

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

1176

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

1234

1177

}

1235

1178

return false;

1236

1179

}

1237

1180

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

1238

1181

if(ifr->ifr_flags & IFF_NOARP){

1239

1182

if(debug){

1240

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

1241

ifname);

1183

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

1184

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

1242

1185

}

1243

1186

return false;

1244

1187

}

1245

1188

1246

1189

/* Accept this device */

1247

1190

if(debug){

1248

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

1191

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

1192

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

1249

1193

}

1250

1194

return true;

1251

1195

}

1255

1199

* corresponds to an acceptable network device.

1256

1200

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

1257

1201

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1202

int good_interface(const struct dirent *if_entry){

1260

1203

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

1261

1204

return 0;

1264

1207

struct ifreq ifr;

1265

1208

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

1266

1209

if(debug){

1267

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

1268

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

1269

}

1270

return 0;

1271

}

1272

1273

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

1274

return 0;

1275

}

1276

return 1;

1277

}

1278

1279

/*

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1210

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

1211

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

1212

if_entry->d_name);

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1219

}

1220

return 1;

1221

}

1222

1223

/*

1224

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

1225

* corresponds to an acceptable network device which is up.

1226

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

1227

*/

1228

int up_interface(const struct dirent *if_entry){

1229

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

1230

return 0;

1231

}

1232

1233

struct ifreq ifr;

1234

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

1235

if(debug){

1236

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

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

/* Reject down interfaces */

1244

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

1245

if(debug){

1246

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

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject non-running interfaces */

1254

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

1255

if(debug){

1256

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

1257

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

1258

if_entry->d_name);

1259

}

1260

return 0;

1261

}

1262

1263

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

1264

return 0;

1265

}

1266

return 1;

1267

}

1268

1314

1269

int notdotentries(const struct dirent *direntry){

1315

1270

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

1316

1271

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

1323

1278

}

1324

1279

1325

1280

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1281

int runnable_hook(const struct dirent *direntry){

1328

1282

int ret;

1329

1283

size_t sret;

1337

1291

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

1338

1292

"abcdefghijklmnopqrstuvwxyz"

1339

1293

"0123456789"

1340

"_.-");

1294

"_-");

1341

1295

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

1342

1296

/* Contains non-allowed characters */

1343

1297

if(debug){

1344

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

1345

direntry->d_name);

1298

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

1299

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

1300

direntry->d_name);

1346

1301

}

1347

1302

return 0;

1348

1303

}

1349

1304

1350

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

1305

char *fullname = NULL;

1306

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

1307

if(ret < 0){

1308

perror_plus("asprintf");

1309

return 0;

1310

}

1311

1312

ret = stat(fullname, &st);

1351

1313

if(ret == -1){

1352

1314

if(debug){

1353

1315

perror_plus("Could not stat hook");

1357

1319

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

1358

1320

/* Not a regular file */

1359

1321

if(debug){

1360

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

1361

direntry->d_name);

1322

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

1323

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

1324

direntry->d_name);

1362

1325

}

1363

1326

return 0;

1364

1327

}

1365

1328

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

1366

1329

/* Not executable */

1367

1330

if(debug){

1368

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

1369

direntry->d_name);

1331

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

1332

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

1333

direntry->d_name);

1370

1334

}

1371

1335

return 0;

1372

1336

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

1337

return 1;

1378

1338

}

1379

1339

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1340

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1341

int ret;

1384

1342

struct timespec now;

1385

1343

struct timespec waited_time;

1386

1344

intmax_t block_time;

1387

1345

1388

1346

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1391

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

1392

" No timeout!\n");

1347

if(mc.current_server == NULL){

1348

if (debug){

1349

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

1350

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

1393

1351

}

1394

1352

ret = avahi_simple_poll_iterate(s, -1);

1395

1353

} else {

1396

if(debug){

1397

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

1398

" it, or wait\n");

1354

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1399

1358

}

1400

1359

/* the current time */

1401

1360

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1406

1365

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

1407

1366

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

1408

1367

waited_time.tv_sec = (now.tv_sec

1409

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

1368

- mc.current_server->last_seen.tv_sec);

1410

1369

waited_time.tv_nsec = (now.tv_nsec

1411

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

1370

- mc.current_server->last_seen.tv_nsec);

1412

1371

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

1413

1372

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

1414

1373

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

1416

1375

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

1417

1376

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

1418

1377

1419

if(debug){

1420

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

1421

block_time);

1378

if (debug){

1379

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

1380

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

1422

1381

}

1423

1382

1424

1383

if(block_time <= 0){

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1384

ret = start_mandos_communication(mc.current_server->ip,

1385

mc.current_server->port,

1386

mc.current_server->if_index,

1387

mc.current_server->af);

1429

1388

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1389

avahi_simple_poll_quit(mc.simple_poll);

1431

1390

return 0;

1432

1391

}

1433

1392

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1393

&mc.current_server->last_seen);

1435

1394

if(ret == -1){

1436

1395

perror_plus("clock_gettime");

1437

1396

return -1;

1438

1397

}

1439

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

1398

mc.current_server = mc.current_server->next;

1440

1399

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

1441

1400

servers, but don't block */

1442

1401

}

1444

1403

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

1445

1404

}

1446

1405

if(ret != 0){

1447

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

1406

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

1448

1407

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

1449

1408

}

1450

1409

}

1451

1410

}

1452

1411

}

1453

1412

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

__attribute__((nonnull))

1511

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

1413

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

1512

1414

const float delay){

1513

1415

struct dirent **direntries;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

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

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

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

1531

runnable_hook, alphasort);

1532

#else /* not __GLIBC_PREREQ(2, 15) */

1533

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

1534

alphasort);

1535

#endif /* not __GLIBC_PREREQ(2, 15) */

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1416

struct dirent *direntry;

1417

int ret;

1418

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

1419

alphasort);

1540

1420

if(numhooks == -1){

1541

1421

perror_plus("scandir");

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

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

1547

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

1548

direntry = direntries[i];

1549

if(debug){

1550

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

1551

direntry->d_name);

1552

}

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1422

} else {

1423

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

1424

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

1425

direntry = direntries[0];

1426

char *fullname = NULL;

1427

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

1428

if(ret < 0){

1613

1429

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1430

continue;

1615

1431

}

1616

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

1617

if(ret == -1){

1432

pid_t hook_pid = fork();

1433

if(hook_pid == 0){

1434

/* Child */

1435

dup2(devnull, STDIN_FILENO);

1436

close(devnull);

1437

dup2(STDERR_FILENO, STDOUT_FILENO);

1438

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

1439

if(ret == -1){

1440

perror_plus("setenv");

1441

return false;

1442

}

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

return false;

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

return false;

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

return false;

1457

}

1458

char *delaystring;

1459

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

1460

if(ret == -1){

1461

perror_plus("asprintf");

1462

return false;

1463

}

1464

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

1465

if(ret == -1){

1466

free(delaystring);

1467

perror_plus("setenv");

1468

return false;

1469

}

1618

1470

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

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

1674

perror_plus("close");

1675

} else {

1676

hookdir_fd = -1;

1677

}

1678

close(devnull);

1679

}

1680

1681

__attribute__((nonnull, warn_unused_result))

1682

error_t bring_up_interface(const char *const interface,

1683

const float delay){

1684

error_t old_errno = errno;

1685

int ret;

1686

struct ifreq network;

1687

unsigned int if_index = if_nametoindex(interface);

1688

if(if_index == 0){

1689

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

1690

errno = old_errno;

1691

return ENXIO;

1692

}

1693

1694

if(quit_now){

1695

errno = old_errno;

1696

return EINTR;

1697

}

1698

1699

if(not interface_is_up(interface)){

1700

error_t ret_errno = 0, ioctl_errno = 0;

1701

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

1702

ret_errno = errno;

1703

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

1704

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

1705

errno = old_errno;

1706

return ret_errno;

1707

}

1708

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

1709

1710

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

1711

if(sd == -1){

1712

ret_errno = errno;

1713

perror_plus("socket");

1714

errno = old_errno;

1715

return ret_errno;

1716

}

1717

1718

if(quit_now){

1719

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

1720

if(ret == -1){

1721

perror_plus("close");

1722

}

1723

errno = old_errno;

1724

return EINTR;

1725

}

1726

1727

if(debug){

1728

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

1729

interface);

1730

}

1731

1732

/* Raise privileges */

1733

ret_errno = raise_privileges();

1734

if(ret_errno != 0){

1735

perror_plus("Failed to raise privileges");

1736

}

1737

1738

#ifdef __linux__

1739

int ret_linux;

1740

bool restore_loglevel = false;

1741

if(ret_errno == 0){

1742

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1743

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

1744

ret_linux = klogctl(8, NULL, 5);

1745

if(ret_linux == -1){

1746

perror_plus("klogctl");

1747

} else {

1748

restore_loglevel = true;

1749

}

1750

}

1751

#endif /* __linux__ */

1752

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

1753

ioctl_errno = errno;

1754

#ifdef __linux__

1755

if(restore_loglevel){

1756

ret_linux = klogctl(7, NULL, 0);

1757

if(ret_linux == -1){

1758

perror_plus("klogctl");

1759

}

1760

}

1761

#endif /* __linux__ */

1762

1763

/* If raise_privileges() succeeded above */

1764

if(ret_errno == 0){

1765

/* Lower privileges */

1766

ret_errno = lower_privileges();

1767

if(ret_errno != 0){

1768

errno = ret_errno;

1769

perror_plus("Failed to lower privileges");

1770

}

1771

}

1772

1773

/* Close the socket */

1774

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

1775

if(ret == -1){

1776

perror_plus("close");

1777

}

1778

1779

if(ret_setflags == -1){

1780

errno = ioctl_errno;

1781

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1782

errno = old_errno;

1783

return ioctl_errno;

1784

}

1785

} else if(debug){

1786

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

1787

interface);

1788

}

1789

1790

/* Sleep checking until interface is running.

1791

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

1792

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

1793

if(interface_is_running(interface)){

1794

break;

1795

}

1796

struct timespec sleeptime = { .tv_nsec = 250000000 };

1797

ret = nanosleep(&sleeptime, NULL);

1798

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

1799

perror_plus("nanosleep");

1800

}

1801

}

1802

1803

errno = old_errno;

1804

return 0;

1805

}

1806

1807

__attribute__((nonnull, warn_unused_result))

1808

error_t take_down_interface(const char *const interface){

1809

error_t old_errno = errno;

1810

struct ifreq network;

1811

unsigned int if_index = if_nametoindex(interface);

1812

if(if_index == 0){

1813

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

1814

errno = old_errno;

1815

return ENXIO;

1816

}

1817

if(interface_is_up(interface)){

1818

error_t ret_errno = 0, ioctl_errno = 0;

1819

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

1820

ret_errno = errno;

1821

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

1822

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

1823

errno = old_errno;

1824

return ret_errno;

1825

}

1826

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

1827

1828

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

1829

if(sd == -1){

1830

ret_errno = errno;

1831

perror_plus("socket");

1832

errno = old_errno;

1833

return ret_errno;

1834

}

1835

1836

if(debug){

1837

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

1838

interface);

1839

}

1840

1841

/* Raise privileges */

1842

ret_errno = raise_privileges();

1843

if(ret_errno != 0){

1844

perror_plus("Failed to raise privileges");

1845

}

1846

1847

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

1848

ioctl_errno = errno;

1849

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1859

1860

/* Close the socket */

1861

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

1862

if(ret == -1){

1863

perror_plus("close");

1864

}

1865

1866

if(ret_setflags == -1){

1867

errno = ioctl_errno;

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1869

errno = old_errno;

1870

return ioctl_errno;

1871

}

1872

} else if(debug){

1873

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

1874

interface);

1875

}

1876

1877

errno = old_errno;

1878

return 0;

1471

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

1472

perror_plus("execl");

1473

} else {

1474

int status;

1475

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

1476

perror_plus("waitpid");

1477

free(fullname);

1478

continue;

1479

}

1480

if(WIFEXITED(status)){

1481

if(WEXITSTATUS(status) != 0){

1482

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

1483

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

1484

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

1485

WEXITSTATUS(status));

1486

free(fullname);

1487

continue;

1488

}

1489

} else if(WIFSIGNALED(status)){

1490

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

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

direntry->d_name);

1500

free(fullname);

1501

continue;

1502

}

1503

}

1504

free(fullname);

1505

if(quit_now){

1506

break;

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1879

1512

}

1880

1513

1881

1514

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

1882

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

1883

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

1884

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

1885

.interfaces = NULL, .interfaces_size = 0 };

1886

1515

AvahiSServiceBrowser *sb = NULL;

1887

error_t ret_errno;

1516

int error;

1888

1517

int ret;

1889

1518

intmax_t tmpmax;

1890

1519

char *tmp;

1891

1520

int exitcode = EXIT_SUCCESS;

1892

char *interfaces_to_take_down = NULL;

1893

size_t interfaces_to_take_down_size = 0;

1894

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

1895

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

1896

char *tempdir = NULL;

1521

const char *interface = "";

1522

struct ifreq network;

1523

int sd = -1;

1524

bool take_down_interface = false;

1525

uid_t uid;

1526

gid_t gid;

1527

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

1528

bool tempdir_created = false;

1897

1529

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1898

1530

const char *seckey = PATHDIR "/" SECKEY;

1899

1531

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1901

1532

1902

1533

bool gnutls_initialized = false;

1903

1534

bool gpgme_initialized = false;

1965

1596

.group = 2 },

1966

1597

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

1967

1598

.arg = "SECONDS",

1968

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

1599

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

1969

1600

.group = 2 },

1970

1601

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

1971

1602

.arg = "DIR",

1994

1625

connect_to = arg;

1995

1626

break;

1996

1627

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

1997

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

1998

arg, (int)',');

1999

if(ret_errno != 0){

2000

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

2001

}

1628

interface = arg;

2002

1629

break;

2003

1630

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

2004

1631

seckey = arg;

2047

1674

argp_state_help(state, state->out_stream,

2048

1675

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2049

1676

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

2050

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

1677

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

1678

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

2051

1679

exit(argp_err_exit_status);

2052

1680

break;

2053

1681

default:

2080

1708

{

2081

1709

/* Work around Debian bug #633582:

2082

1710

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

2083

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

2089

} else {

2090

struct stat st;

2091

2092

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

2093

int seckey_fd = open(seckey, O_RDONLY);

2094

if(seckey_fd == -1){

2095

perror_plus("open");

2096

} else {

2097

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

2098

if(ret == -1){

2099

perror_plus("fstat");

2100

} else {

2101

if(S_ISREG(st.st_mode)

2102

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

2103

ret = fchown(seckey_fd, uid, gid);

2104

if(ret == -1){

2105

perror_plus("fchown");

2106

}

2107

}

2108

}

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2110

}

2111

}

2112

2113

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

2114

int pubkey_fd = open(pubkey, O_RDONLY);

2115

if(pubkey_fd == -1){

2116

perror_plus("open");

2117

} else {

2118

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

2119

if(ret == -1){

2120

perror_plus("fstat");

2121

} else {

2122

if(S_ISREG(st.st_mode)

2123

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

2124

ret = fchown(pubkey_fd, uid, gid);

2125

if(ret == -1){

2126

perror_plus("fchown");

2127

}

2128

}

2129

}

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2134

/* Lower privileges */

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2140

}

2141

}

2142

2143

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

2144

{

2145

char *interface = NULL;

2146

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

2147

interface))){

2148

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

2149

and if_nametoindex(interface) == 0){

2150

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

2151

fprintf_plus(stderr, "Not using nonexisting interface"

2152

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

2153

}

2154

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

2155

interface = NULL;

2156

}

1711

struct stat st;

1712

1713

/* Re-raise priviliges */

1714

errno = 0;

1715

ret = seteuid(0);

1716

if(ret == -1){

1717

perror_plus("seteuid");

1718

}

1719

1720

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

1721

int seckey_fd = open(seckey, O_RDONLY);

1722

if(seckey_fd == -1){

1723

perror_plus("open");

1724

} else {

1725

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

1726

if(ret == -1){

1727

perror_plus("fstat");

1728

} else {

1729

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

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

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

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

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

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2157

1765

}

2158

1766

}

2159

1767

2160

1768

/* Run network hooks */

2161

1769

{

2162

if(mc.interfaces != NULL){

2163

interfaces_hooks = malloc(mc.interfaces_size);

2164

if(interfaces_hooks == NULL){

2165

perror_plus("malloc");

2166

goto end;

2167

}

2168

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

2169

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

2170

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

1770

/* Re-raise priviliges */

1771

errno = 0;

1772

ret = seteuid(0);

1773

if(ret == -1){

1774

perror_plus("seteuid");

1775

}

1776

if(not run_network_hooks("start", interface, delay)){

1777

goto end;

1778

}

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1784

}

2173

1785

}

2174

1786

2175

1787

if(not debug){

2176

1788

avahi_set_log_function(empty_log);

2177

1789

}

2178

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

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

1808

}

1809

if(interface == NULL){

1810

perror_plus("malloc");

1811

free(direntries);

1812

exitcode = EXIT_FAILURE;

1813

goto end;

1814

}

1815

free(direntries);

1816

} else {

1817

free(direntries);

1818

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

1819

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

1820

exitcode = EXIT_FAILURE;

1821

goto end;

1822

}

1823

}

1824

2179

1825

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

2180

1826

from the signal handler */

2181

1827

/* Initialize the pseudo-RNG for Avahi */

2182

1828

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

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

2185

fprintf_plus(stderr,

2186

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

1829

mc.simple_poll = avahi_simple_poll_new();

1830

if(mc.simple_poll == NULL){

1831

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

1832

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

2187

1833

exitcode = EX_UNAVAILABLE;

2188

1834

goto end;

2189

1835

}

2251

1897

}

2252

1898

}

2253

1899

2254

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

2255

if(mc.interfaces == NULL){

2256

struct dirent **direntries = NULL;

2257

/* Look for any good interfaces */

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2259

alphasort);

2260

if(ret >= 1){

2261

/* Add all found interfaces to interfaces list */

2262

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

2263

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

2264

direntries[i]->d_name);

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("argz_add");

2268

continue;

2269

}

2270

if(debug){

2271

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

2272

direntries[i]->d_name);

2273

}

2274

}

2275

free(direntries);

2276

} else {

2277

free(direntries);

2278

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

2279

exitcode = EXIT_FAILURE;

2280

goto end;

2281

}

2282

}

2283

2284

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

2285

{

2286

char *interface = NULL;

2287

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

2288

interface))){

2289

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

2290

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

2291

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

2292

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

2293

interface);

2294

interface = NULL;

2295

while((interface = argz_next(mc.interfaces,

2296

mc.interfaces_size, interface))){

2297

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

2298

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

2299

interface);

2300

interface = NULL;

1900

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

1901

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

1902

if_index = (AvahiIfIndex) if_nametoindex(interface);

1903

if(if_index == 0){

1904

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

1905

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

1906

exitcode = EX_UNAVAILABLE;

1907

goto end;

1908

}

1909

1910

if(quit_now){

1911

goto end;

1912

}

1913

1914

/* Re-raise priviliges */

1915

errno = 0;

1916

ret = seteuid(0);

1917

if(ret == -1){

1918

perror_plus("seteuid");

1919

}

1920

1921

#ifdef __linux__

1922

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1924

ret = klogctl(8, NULL, 5);

1925

bool restore_loglevel = true;

1926

if(ret == -1){

1927

restore_loglevel = false;

1928

perror_plus("klogctl");

1929

}

1930

#endif /* __linux__ */

1931

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

ret = klogctl(7, NULL, 0);

1939

if(ret == -1){

1940

perror_plus("klogctl");

1941

}

1942

}

1943

#endif /* __linux__ */

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

strcpy(network.ifr_name, interface);

1953

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

1954

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1956

#ifdef __linux__

1957

if(restore_loglevel){

1958

ret = klogctl(7, NULL, 0);

1959

if(ret == -1){

1960

perror_plus("klogctl");

1961

}

1962

}

1963

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

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

1974

network.ifr_flags |= IFF_UP;

1975

take_down_interface = true;

1976

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

1977

if(ret == -1){

1978

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1981

#ifdef __linux__

1982

if(restore_loglevel){

1983

ret = klogctl(7, NULL, 0);

1984

if(ret == -1){

1985

perror_plus("klogctl");

2301

1986

}

2302

1987

}

1988

#endif /* __linux__ */

1989

/* Lower privileges */

1990

errno = 0;

1991

ret = seteuid(uid);

1992

if(ret == -1){

1993

perror_plus("seteuid");

1994

}

1995

goto end;

1996

}

1997

}

1998

/* Sleep checking until interface is running.

1999

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

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

2004

} else if(network.ifr_flags & IFF_RUNNING){

2303

2005

break;

2304

2006

}

2305

bool interface_was_up = interface_is_up(interface);

2306

errno = bring_up_interface(interface, delay);

2307

if(not interface_was_up){

2308

if(errno != 0){

2309

perror_plus("Failed to bring up interface");

2310

} else {

2311

errno = argz_add(&interfaces_to_take_down,

2312

&interfaces_to_take_down_size,

2313

interface);

2314

if(errno != 0){

2315

perror_plus("argz_add");

2316

}

2317

}

2318

}

2319

}

2320

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

2321

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

2322

}

2323

}

2324

2325

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

2326

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

2327

if(debug){

2328

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

2329

mc.interfaces);

2330

}

2331

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

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

ret = nanosleep(&sleeptime, NULL);

2009

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

2010

perror_plus("nanosleep");

2011

}

2012

}

2013

if(not take_down_interface){

2014

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

2015

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

2016

if(ret == -1){

2017

perror_plus("close");

2018

}

2019

}

2020

#ifdef __linux__

2021

if(restore_loglevel){

2022

/* Restores kernel loglevel to default */

2023

ret = klogctl(7, NULL, 0);

2024

if(ret == -1){

2025

perror_plus("klogctl");

2026

}

2027

}

2028

#endif /* __linux__ */

2029

/* Lower privileges */

2030

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2035

}

2332

2036

}

2333

2037

2334

2038

if(quit_now){

2335

2039

goto end;

2336

2040

}

2337

2041

2338

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

2042

ret = init_gnutls_global(pubkey, seckey);

2339

2043

if(ret == -1){

2340

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

2044

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

2045

"init_gnutls_global failed\n");

2341

2046

exitcode = EX_UNAVAILABLE;

2342

2047

goto end;

2343

2048

} else {

2348

2053

goto end;

2349

2054

}

2350

2055

2351

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

2352

tempdir = mkdtemp(run_tempdir);

2353

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

2354

if(debug){

2355

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

2356

run_tempdir, old_tempdir);

2357

}

2358

tempdir = mkdtemp(old_tempdir);

2359

}

2360

if(tempdir == NULL){

2056

if(mkdtemp(tempdir) == NULL){

2361

2057

perror_plus("mkdtemp");

2362

2058

goto end;

2363

2059

}

2060

tempdir_created = true;

2364

2061

2365

2062

if(quit_now){

2366

2063

goto end;

2367

2064

}

2368

2065

2369

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

2370

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

2066

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

2067

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

2068

"init_gpgme failed\n");

2371

2069

exitcode = EX_UNAVAILABLE;

2372

2070

goto end;

2373

2071

} else {

2382

2080

/* Connect directly, do not use Zeroconf */

2383

2081

/* (Mainly meant for debugging) */

2384

2082

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

2385

2386

2083

if(address == NULL){

2387

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

2084

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

2085

"No colon in address\n");

2388

2086

exitcode = EX_USAGE;

2389

2087

goto end;

2390

2088

}

2393

2091

goto end;

2394

2092

}

2395

2093

2396

in_port_t port;

2094

uint16_t port;

2397

2095

errno = 0;

2398

2096

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

2399

2097

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

2400

or tmpmax != (in_port_t)tmpmax){

2401

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

2098

or tmpmax != (uint16_t)tmpmax){

2099

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

2100

"Bad port number\n");

2402

2101

exitcode = EX_USAGE;

2403

2102

goto end;

2404

2103

}

2405

2104

2406

2105

if(quit_now){

2407

2106

goto end;

2408

2107

}

2409

2108

2410

port = (in_port_t)tmpmax;

2109

port = (uint16_t)tmpmax;

2411

2110

*address = '\0';

2412

2111

/* Colon in address indicates IPv6 */

2413

2112

int af;

2429

2128

}

2430

2129

2431

2130

while(not quit_now){

2432

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

2433

&mc);

2131

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

2434

2132

if(quit_now or ret == 0){

2435

2133

break;

2436

2134

}

2437

2135

if(debug){

2438

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

2439

(int)retry_interval);

2136

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

2137

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

2440

2138

}

2441

sleep((unsigned int)retry_interval);

2139

sleep((int)retry_interval);

2442

2140

}

2443

2141

2444

if(not quit_now){

2142

if (not quit_now){

2445

2143

exitcode = EXIT_SUCCESS;

2446

2144

}

2447

2145

2462

2160

config.publish_domain = 0;

2463

2161

2464

2162

/* Allocate a new server */

2465

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2466

&config, NULL, NULL, &ret_errno);

2163

mc.server = avahi_server_new(avahi_simple_poll_get

2164

(mc.simple_poll), &config, NULL,

2165

NULL, &error);

2467

2166

2468

2167

/* Free the Avahi configuration data */

2469

2168

avahi_server_config_free(&config);

2471

2170

2472

2171

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

2473

2172

if(mc.server == NULL){

2474

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

2475

avahi_strerror(ret_errno));

2173

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

2174

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

2175

avahi_strerror(error));

2476

2176

exitcode = EX_UNAVAILABLE;

2477

2177

goto end;

2478

2178

}

2484

2184

/* Create the Avahi service browser */

2485

2185

sb = avahi_s_service_browser_new(mc.server, if_index,

2486

2186

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2487

NULL, 0, browse_callback,

2488

(void *)&mc);

2187

NULL, 0, browse_callback, NULL);

2489

2188

if(sb == NULL){

2490

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

2491

avahi_strerror(avahi_server_errno(mc.server)));

2189

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

2190

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

2191

avahi_strerror(avahi_server_errno(mc.server)));

2492

2192

exitcode = EX_UNAVAILABLE;

2493

2193

goto end;

2494

2194

}

2500

2200

/* Run the main loop */

2501

2201

2502

2202

if(debug){

2503

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

2203

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

2204

"Starting Avahi loop search\n");

2504

2205

}

2505

2506

ret = avahi_loop_with_timeout(simple_poll,

2507

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

2206

2207

ret = avahi_loop_with_timeout(mc.simple_poll,

2208

(int)(retry_interval * 1000));

2508

2209

if(debug){

2509

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

2510

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

2210

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

2211

"avahi_loop_with_timeout exited %s\n",

2212

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

2511

2213

}

2512

2214

2513

2215

end:

2514

2216

2515

2217

if(debug){

2516

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

2218

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

2219

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

2517

2220

}

2518

2221

2519

2222

/* Cleanup things */

2520

free(mc.interfaces);

2521

2522

2223

if(sb != NULL)

2523

2224

avahi_s_service_browser_free(sb);

2524

2225

2525

2226

if(mc.server != NULL)

2526

2227

avahi_server_free(mc.server);

2527

2228

2528

if(simple_poll != NULL)

2529

avahi_simple_poll_free(simple_poll);

2229

if(mc.simple_poll != NULL)

2230

avahi_simple_poll_free(mc.simple_poll);

2530

2231

2531

2232

if(gnutls_initialized){

2532

2233

gnutls_certificate_free_credentials(mc.cred);

2537

2238

if(gpgme_initialized){

2538

2239

gpgme_release(mc.ctx);

2539

2240

}

2540

2241

2541

2242

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

2542

2243

has seen */

2543

2244

if(mc.current_server != NULL){

2549

2250

}

2550

2251

}

2551

2252

2552

/* Re-raise privileges */

2253

/* Re-raise priviliges */

2553

2254

{

2554

ret_errno = raise_privileges();

2555

if(ret_errno != 0){

2556

perror_plus("Failed to raise privileges");

2557

} else {

2558

2559

/* Run network hooks */

2560

run_network_hooks("stop", interfaces_hooks != NULL ?

2561

interfaces_hooks : "", delay);

2562

2563

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

2564

{

2565

char *interface = NULL;

2566

while((interface=argz_next(interfaces_to_take_down,

2567

interfaces_to_take_down_size,

2568

interface))){

2569

ret_errno = take_down_interface(interface);

2570

if(ret_errno != 0){

2571

errno = ret_errno;

2572

perror_plus("Failed to take down interface");

2573

}

2574

}

2575

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

2576

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

2577

" down\n");

2578

}

2579

}

2255

errno = 0;

2256

ret = seteuid(0);

2257

if(ret == -1){

2258

perror_plus("seteuid");

2259

}

2260

/* Run network hooks */

2261

if(not run_network_hooks("stop", interface, delay)){

2262

goto end;

2580

2263

}

2581

2264

2582

ret_errno = lower_privileges_permanently();

2583

if(ret_errno != 0){

2584

perror_plus("Failed to lower privileges permanently");

2265

/* Take down the network interface */

2266

if(take_down_interface and geteuid() == 0){

2267

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

2268

if(ret == -1){

2269

perror_plus("ioctl SIOCGIFFLAGS");

2270

} else if(network.ifr_flags & IFF_UP){

2271

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

2272

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

2273

if(ret == -1){

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2275

}

2276

}

2277

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

2278

if(ret == -1){

2279

perror_plus("close");

2280

}

2585

2281

}

2586

2282

}

2587

2588

free(interfaces_to_take_down);

2589

free(interfaces_hooks);

2283

/* Lower privileges permanently */

2284

errno = 0;

2285

ret = setuid(uid);

2286

if(ret == -1){

2287

perror_plus("setuid");

2288

}

2590

2289

2591

2290

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

2592

if(tempdir != NULL){

2291

if(tempdir_created){

2593

2292

struct dirent **direntries = NULL;

2594

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2595

O_NOFOLLOW));

2596

if(tempdir_fd == -1){

2597

perror_plus("open");

2598

} else {

2599

#ifdef __GLIBC__

2600

#if __GLIBC_PREREQ(2, 15)

2601

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

2602

notdotentries, alphasort);

2603

#else /* not __GLIBC_PREREQ(2, 15) */

2604

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

2605

alphasort);

2606

#endif /* not __GLIBC_PREREQ(2, 15) */

2607

#else /* not __GLIBC__ */

2608

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

2609

alphasort);

2610

#endif /* not __GLIBC__ */

2611

if(numentries > 0){

2612

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

2613

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2614

if(ret == -1){

2615

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2616

" \"%s\", 0): %s\n", tempdir,

2617

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

2618

}

2619

}

2620

2621

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

2622

free(direntries);

2623

if(numentries == -1){

2624

perror_plus("scandir");

2625

}

2626

ret = rmdir(tempdir);

2627

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

2628

perror_plus("rmdir");

2629

}

2293

struct dirent *direntry = NULL;

2294

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

2295

alphasort);

2296

if (numentries > 0){

2297

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

2298

direntry = direntries[i];

2299

char *fullname = NULL;

2300

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

2301

direntry->d_name);

2302

if(ret < 0){

2303

perror_plus("asprintf");

2304

continue;

2305

}

2306

ret = remove(fullname);

2307

if(ret == -1){

2308

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

2309

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

2310

}

2311

free(fullname);

2630

2312

}

2631

TEMP_FAILURE_RETRY(close(tempdir_fd));

2313

}

2314

2315

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

2316

free(direntries);

2317

if (numentries == -1){

2318

perror_plus("scandir");

2319

}

2320

ret = rmdir(tempdir);

2321

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

2322

perror_plus("rmdir");

2632

2323

}

2633

2324

}

2634

2325