/mandos/release : revision 237.7.238

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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

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

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause() */

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

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setgid(), pause(), _exit() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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/* 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 ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

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return false;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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}

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/* unique case of first server */

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if (mc.current_server == NULL){

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return false;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return false;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

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} else {

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new_server->next = mc.current_server;

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

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

221

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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bool import_key(const char *filename){

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bool import_key(const char * const filename){

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int ret;

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int fd;

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gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

280

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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return false;

283

315

}

284

316

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

317

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

286

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rc = gpgme_get_engine_info(&engine_info);

287

319

if(rc != GPG_ERR_NO_ERROR){

288

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

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gpgme_strsource(rc), gpgme_strerror(rc));

320

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

321

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

291

323

}

292

324

while(engine_info != NULL){

298

330

engine_info = engine_info->next;

299

331

}

300

332

if(engine_info == NULL){

301

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

333

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

334

tempdir);

302

335

return false;

303

336

}

304

337

305

338

/* Create new GPGME "context" */

306

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

339

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

307

340

if(rc != GPG_ERR_NO_ERROR){

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

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

343

gpgme_strerror(rc));

310

344

return false;

311

345

}

312

346

321

355

* Decrypt OpenPGP data.

322

356

* Returns -1 on error

323

357

*/

358

__attribute__((nonnull, warn_unused_result))

324

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

325

360

size_t crypto_size,

326

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

327

363

gpgme_data_t dh_crypto, dh_plain;

328

364

gpgme_error_t rc;

329

365

ssize_t ret;

331

367

ssize_t plaintext_length = 0;

332

368

333

369

if(debug){

334

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

370

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

335

371

}

336

372

337

373

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

338

374

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

339

375

0);

340

376

if(rc != GPG_ERR_NO_ERROR){

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

343

379

return -1;

344

380

}

345

381

346

382

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

347

383

rc = gpgme_data_new(&dh_plain);

348

384

if(rc != GPG_ERR_NO_ERROR){

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

385

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

351

388

gpgme_data_release(dh_crypto);

352

389

return -1;

353

390

}

354

391

355

392

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

356

393

data buffer */

357

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

394

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

358

395

if(rc != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

396

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

361

398

plaintext_length = -1;

362

399

if(debug){

363

400

gpgme_decrypt_result_t result;

364

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

365

402

if(result == NULL){

366

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

403

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

367

404

} else {

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

405

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

406

result->unsupported_algorithm);

407

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

408

result->wrong_key_usage);

372

409

if(result->file_name != NULL){

373

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

410

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

374

411

}

375

412

gpgme_recipient_t recipient;

376

413

recipient = result->recipients;

377

414

while(recipient != NULL){

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

415

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

416

gpgme_pubkey_algo_name

417

(recipient->pubkey_algo));

418

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

419

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

420

recipient->status == GPG_ERR_NO_SECKEY

421

? "No" : "Yes");

384

422

recipient = recipient->next;

385

423

}

386

424

}

389

427

}

390

428

391

429

if(debug){

392

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

430

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

393

431

}

394

432

395

433

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

402

440

*plaintext = NULL;

403

441

while(true){

404

442

plaintext_capacity = incbuffer(plaintext,

405

(size_t)plaintext_length,

406

plaintext_capacity);

443

(size_t)plaintext_length,

444

plaintext_capacity);

407

445

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

446

perror_plus("incbuffer");

447

plaintext_length = -1;

448

goto decrypt_end;

411

449

}

412

450

413

451

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

426

464

}

427

465

428

466

if(debug){

429

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

467

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

430

468

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

431

469

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

432

470

}

443

481

return plaintext_length;

444

482

}

445

483

446

static const char * safer_gnutls_strerror(int value){

447

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

448

-Wunreachable-code */

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

449

487

if(ret == NULL)

450

488

ret = "(unknown)";

451

489

return ret;

452

490

}

453

491

454

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

455

494

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

456

495

const char* string){

457

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

496

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

458

497

}

459

498

499

__attribute__((nonnull, warn_unused_result))

460

500

static int init_gnutls_global(const char *pubkeyfilename,

461

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

462

503

int ret;

463

504

464

505

if(debug){

465

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

506

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

466

507

}

467

508

468

509

ret = gnutls_global_init();

469

510

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

511

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

512

safer_gnutls_strerror(ret));

472

513

return -1;

473

514

}

474

515

481

522

}

482

523

483

524

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

526

if(ret != GNUTLS_E_SUCCESS){

486

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

487

safer_gnutls_strerror(ret));

527

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

528

safer_gnutls_strerror(ret));

488

529

gnutls_global_deinit();

489

530

return -1;

490

531

}

491

532

492

533

if(debug){

493

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

494

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

495

seckeyfilename);

534

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

496

538

}

497

539

498

540

ret = gnutls_certificate_set_openpgp_key_file

499

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

500

542

GNUTLS_OPENPGP_FMT_BASE64);

501

543

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

544

fprintf_plus(stderr,

545

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

546

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

547

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

548

safer_gnutls_strerror(ret));

507

549

goto globalfail;

508

550

}

509

551

510

552

/* GnuTLS server initialization */

511

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

512

554

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

515

558

goto globalfail;

516

559

}

517

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

560

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

518

561

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

562

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

563

safer_gnutls_strerror(ret));

521

564

goto globalfail;

522

565

}

523

566

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

525

568

526

569

return 0;

527

570

528

571

globalfail:

529

572

530

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

531

574

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

533

576

return -1;

534

577

}

535

578

536

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

537

582

int ret;

538

583

/* GnuTLS session creation */

539

584

do {

543

588

}

544

589

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

545

590

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

548

594

}

549

595

550

596

{

551

597

const char *err;

552

598

do {

553

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

599

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

554

600

if(quit_now){

555

601

gnutls_deinit(*session);

556

602

return -1;

557

603

}

558

604

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

559

605

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

606

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

607

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

608

safer_gnutls_strerror(ret));

563

609

gnutls_deinit(*session);

564

610

return -1;

565

611

}

567

613

568

614

do {

569

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

616

mc->cred);

571

617

if(quit_now){

572

618

gnutls_deinit(*session);

573

619

return -1;

574

620

}

575

621

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

576

622

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

623

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

624

safer_gnutls_strerror(ret));

579

625

gnutls_deinit(*session);

580

626

return -1;

581

627

}

583

629

/* ignore client certificate if any. */

584

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

585

631

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

633

588

634

return 0;

589

635

}

593

639

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

594

640

595

641

/* Called when a Mandos server is found */

596

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

642

__attribute__((nonnull, warn_unused_result))

643

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

597

644

AvahiIfIndex if_index,

598

int af){

645

int af, mandos_context *mc){

599

646

int ret, tcp_sd = -1;

600

647

ssize_t sret;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

648

struct sockaddr_storage to;

605

649

char *buffer = NULL;

606

650

char *decrypted_buffer = NULL;

607

651

size_t buffer_length = 0;

626

670

pf = PF_INET;

627

671

break;

628

672

default:

629

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

673

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

630

674

errno = EINVAL;

631

675

return -1;

632

676

}

633

677

634

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

635

711

if(ret != 0){

636

712

return -1;

637

713

}

638

714

639

715

if(debug){

640

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

641

"\n", ip, port);

716

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

717

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

642

718

}

643

719

644

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

656

732

657

733

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

658

734

if(af == AF_INET6){

659

to.in6.sin6_family = (sa_family_t)af;

660

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

735

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

736

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

661

737

} else { /* IPv4 */

662

to.in.sin_family = (sa_family_t)af;

663

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

738

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

739

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

664

740

}

665

741

if(ret < 0 ){

666

742

int e = errno;

670

746

}

671

747

if(ret == 0){

672

748

int e = errno;

673

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

749

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

674

750

errno = e;

675

751

goto mandos_end;

676

752

}

677

753

if(af == AF_INET6){

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

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

684

-Wunreachable-code*/

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

685

757

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

758

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

759

" incomplete without a network interface\n");

688

760

errno = EINVAL;

689

761

goto mandos_end;

690

762

}

691

763

/* Set the network interface number as scope */

692

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

693

765

}

694

766

} else {

695

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

696

-Wconversion and

697

-Wunreachable-code */

767

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

698

768

}

699

769

700

770

if(quit_now){

708

778

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

709

779

perror_plus("if_indextoname");

710

780

} else {

711

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

712

ip, interface, port);

781

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

782

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

713

783

}

714

784

} else {

715

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

716

port);

785

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

786

ip, (uintmax_t)port);

717

787

}

718

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

720

const char *pcret;

721

790

if(af == AF_INET6){

722

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

723

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

724

795

} else {

725

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

726

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

727

800

}

728

if(pcret == NULL){

729

perror_plus("inet_ntop");

730

} else {

731

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

732

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

733

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

734

807

}

735

808

}

736

809

740

813

}

741

814

742

815

if(af == AF_INET6){

743

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

816

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

817

sizeof(struct sockaddr_in6));

744

818

} else {

745

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

819

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

820

sizeof(struct sockaddr_in));

746

821

}

747

822

if(ret < 0){

748

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

823

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

749

824

int e = errno;

750

825

perror_plus("connect");

751

826

errno = e;

763

838

while(true){

764

839

size_t out_size = strlen(out);

765

840

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

766

out_size - written));

841

out_size - written));

767

842

if(ret == -1){

768

843

int e = errno;

769

844

perror_plus("write");

789

864

}

790

865

791

866

if(debug){

792

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

867

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

793

868

}

794

869

795

870

if(quit_now){

797

872

goto mandos_end;

798

873

}

799

874

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

880

803

881

if(quit_now){

804

882

errno = EINTR;

815

893

816

894

if(ret != GNUTLS_E_SUCCESS){

817

895

if(debug){

818

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

896

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

819

897

gnutls_perror(ret);

820

898

}

821

899

errno = EPROTO;

825

903

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

826

904

827

905

if(debug){

828

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

829

ip);

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

830

908

}

831

909

832

910

while(true){

837

915

}

838

916

839

917

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

918

buffer_capacity);

841

919

if(buffer_capacity == 0){

842

920

int e = errno;

843

921

perror_plus("incbuffer");

870

948

}

871

949

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

872

950

if(ret < 0){

873

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

951

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

952

"***\n");

874

953

gnutls_perror(ret);

875

954

errno = EPROTO;

876

955

goto mandos_end;

877

956

}

878

957

break;

879

958

default:

880

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

881

" encrypted session with Mandos server\n");

959

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

960

" encrypted session with Mandos server\n");

882

961

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

962

errno = EIO;

884

963

goto mandos_end;

889

968

}

890

969

891

970

if(debug){

892

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

971

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

893

972

}

894

973

895

974

if(quit_now){

907

986

908

987

if(buffer_length > 0){

909

988

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

913

991

if(decrypted_buffer_size >= 0){

914

992

915

993

written = 0;

925

1003

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

926

1004

int e = errno;

927

1005

if(debug){

928

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

929

strerror(errno));

1006

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

1007

strerror(errno));

930

1008

}

931

1009

errno = e;

932

1010

goto mandos_end;

963

1041

return retval;

964

1042

}

965

1043

1044

__attribute__((nonnull))

966

1045

static void resolve_callback(AvahiSServiceResolver *r,

967

1046

AvahiIfIndex interface,

968

1047

AvahiProtocol proto,

976

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

977

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

978

1057

flags,

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

981

1062

982

1063

/* Called whenever a service has been resolved successfully or

983

1064

timed out */

989

1070

switch(event){

990

1071

default:

991

1072

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

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

1075

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

995

1078

break;

996

1079

997

1080

case AVAHI_RESOLVER_FOUND:

999

1082

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1083

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

1001

1084

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1085

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

1086

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

1087

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

1005

1088

}

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1008

1093

if(ret == 0){

1009

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1010

1095

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1013

1102

}

1014

1103

}

1015

1104

}

1025

1114

const char *domain,

1026

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1027

1116

flags,

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1030

1121

1031

1122

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

1032

1123

is removed from the LAN */

1039

1130

default:

1040

1131

case AVAHI_BROWSER_FAILURE:

1041

1132

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1133

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1045

1137

return;

1046

1138

1047

1139

case AVAHI_BROWSER_NEW:

1050

1142

the callback function is called the Avahi server will free the

1051

1143

resolver for us. */

1052

1144

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

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

1057

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

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1149

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

1150

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

1058

1153

break;

1059

1154

1060

1155

case AVAHI_BROWSER_REMOVE:

1063

1158

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1159

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1160

if(debug){

1066

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

1161

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

1162

" searching...\n");

1067

1163

}

1068

1164

break;

1069

1165

}

1078

1174

signal_received = sig;

1079

1175

int old_errno = errno;

1080

1176

/* set main loop to exit */

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1083

1179

}

1084

1180

errno = old_errno;

1085

1181

}

1086

1182

1183

__attribute__((nonnull, warn_unused_result))

1184

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

1185

int ret;

1186

error_t ret_errno;

1187

1188

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

1189

if(s < 0){

1190

ret_errno = errno;

1191

perror_plus("socket");

1192

errno = ret_errno;

1193

return false;

1194

}

1195

strcpy(ifr->ifr_name, ifname);

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

if(ret == -1){

1198

if(debug){

1199

ret_errno = errno;

1200

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1202

}

1203

return false;

1204

}

1205

return true;

1206

}

1207

1208

__attribute__((nonnull, warn_unused_result))

1209

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

1210

1211

/* Reject the loopback device */

1212

if(ifr->ifr_flags & IFF_LOOPBACK){

1213

if(debug){

1214

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

1215

ifname);

1216

}

1217

return false;

1218

}

1219

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

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return true;

1226

}

1227

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

1228

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

1229

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1232

}

1233

return false;

1234

}

1235

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

1236

if(ifr->ifr_flags & IFF_NOARP){

1237

if(debug){

1238

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

1239

ifname);

1240

}

1241

return false;

1242

}

1243

1244

/* Accept this device */

1245

if(debug){

1246

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

1247

}

1248

return true;

1249

}

1250

1087

1251

/*

1088

1252

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

1089

1253

* corresponds to an acceptable network device.

1090

1254

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

1091

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1092

1257

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

1258

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

1096

1259

return 0;

1097

1260

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1261

1262

struct ifreq ifr;

1263

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

1264

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1188

1273

}

1189

1274

return 1;

1190

1275

}

1191

1276

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1192

1312

int notdotentries(const struct dirent *direntry){

1193

1313

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

1194

1314

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

1200

1320

return 1;

1201

1321

}

1202

1322

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1325

int runnable_hook(const struct dirent *direntry){

1326

int ret;

1327

size_t sret;

1328

struct stat st;

1329

1330

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

1331

/* Empty name? */

1332

return 0;

1333

}

1334

1335

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

1336

"abcdefghijklmnopqrstuvwxyz"

1337

"0123456789"

1338

"_.-");

1339

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

1340

/* Contains non-allowed characters */

1341

if(debug){

1342

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

1343

direntry->d_name);

1344

}

1345

return 0;

1346

}

1347

1348

char *fullname = NULL;

1349

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

1350

if(ret < 0){

1351

perror_plus("asprintf");

1352

return 0;

1353

}

1354

1355

ret = stat(fullname, &st);

1356

if(ret == -1){

1357

if(debug){

1358

perror_plus("Could not stat hook");

1359

}

1360

return 0;

1361

}

1362

free(fullname);

1363

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

1364

/* Not a regular file */

1365

if(debug){

1366

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

1367

direntry->d_name);

1368

}

1369

return 0;

1370

}

1371

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

1372

/* Not executable */

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

return 0;

1378

}

1379

if(debug){

1380

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

1381

direntry->d_name);

1382

}

1383

return 1;

1384

}

1385

1386

__attribute__((nonnull, warn_unused_result))

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

mandos_context *mc){

1204

1389

int ret;

1205

1390

struct timespec now;

1206

1391

struct timespec waited_time;

1207

1392

intmax_t block_time;

1208

1393

1209

1394

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

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

1395

if(mc->current_server == NULL){

1396

if(debug){

1397

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

1398

" No timeout!\n");

1214

1399

}

1215

1400

ret = avahi_simple_poll_iterate(s, -1);

1216

1401

} else {

1217

if (debug){

1218

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

1219

" or wait\n");

1402

if(debug){

1403

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

1404

" it, or wait\n");

1220

1405

}

1221

1406

/* the current time */

1222

1407

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1227

1412

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

1228

1413

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

1229

1414

waited_time.tv_sec = (now.tv_sec

1230

- mc.current_server->last_seen.tv_sec);

1415

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

1231

1416

waited_time.tv_nsec = (now.tv_nsec

1232

- mc.current_server->last_seen.tv_nsec);

1417

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

1233

1418

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

1234

1419

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

1235

1420

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

1236

1421

block_time = ((retry_interval

1237

1422

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

1238

1423

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

1239

1240

if (debug){

1241

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

1424

1425

if(debug){

1426

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

1427

block_time);

1242

1428

}

1243

1429

1244

1430

if(block_time <= 0){

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1431

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

1432

mc->current_server->port,

1433

mc->current_server->if_index,

1434

mc->current_server->af, mc);

1249

1435

if(ret == 0){

1250

avahi_simple_poll_quit(mc.simple_poll);

1436

avahi_simple_poll_quit(s);

1251

1437

return 0;

1252

1438

}

1253

1439

ret = clock_gettime(CLOCK_MONOTONIC,

1254

&mc.current_server->last_seen);

1440

&mc->current_server->last_seen);

1255

1441

if(ret == -1){

1256

1442

perror_plus("clock_gettime");

1257

1443

return -1;

1258

1444

}

1259

mc.current_server = mc.current_server->next;

1445

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

1260

1446

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

1261

1447

servers, but don't block */

1262

1448

}

1264

1450

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

1265

1451

}

1266

1452

if(ret != 0){

1267

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

1453

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

1268

1454

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

1269

1455

}

1270

1456

}

1271

1457

}

1272

1458

}

1273

1459

1460

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

1461

__attribute__((warn_unused_result))

1462

error_t raise_privileges(void){

1463

error_t old_errno = errno;

1464

error_t ret_errno = 0;

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

__attribute__((warn_unused_result))

1475

error_t raise_privileges_permanently(void){

1476

error_t old_errno = errno;

1477

error_t ret_errno = raise_privileges();

1478

if(ret_errno != 0){

1479

errno = old_errno;

1480

return ret_errno;

1481

}

1482

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

1483

ret_errno = errno;

1484

perror_plus("seteuid");

1485

}

1486

errno = old_errno;

1487

return ret_errno;

1488

}

1489

1490

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

1491

__attribute__((warn_unused_result))

1492

error_t lower_privileges(void){

1493

error_t old_errno = errno;

1494

error_t ret_errno = 0;

1495

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

1496

ret_errno = errno;

1497

perror_plus("seteuid");

1498

}

1499

errno = old_errno;

1500

return ret_errno;

1501

}

1502

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

error_t lower_privileges_permanently(void){

1506

error_t old_errno = errno;

1507

error_t ret_errno = 0;

1508

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

1509

ret_errno = errno;

1510

perror_plus("setuid");

1511

}

1512

errno = old_errno;

1513

return ret_errno;

1514

}

1515

1516

__attribute__((nonnull))

1517

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

1518

const float delay){

1519

struct dirent **direntries;

1520

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

1521

alphasort);

1522

if(numhooks == -1){

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("scandir");

1530

}

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1534

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

1535

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

1536

direntry = direntries[i];

1537

char *fullname = NULL;

1538

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

1539

if(ret < 0){

1540

perror_plus("asprintf");

1541

continue;

1542

}

1543

if(debug){

1544

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

1545

direntry->d_name);

1546

}

1547

pid_t hook_pid = fork();

1548

if(hook_pid == 0){

1549

/* Child */

1550

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1555

/* Set group */

1556

errno = 0;

1557

ret = setgid(0);

1558

if(ret == -1){

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

}

1562

/* Reset supplementary groups */

1563

errno = 0;

1564

ret = setgroups(0, NULL);

1565

if(ret == -1){

1566

perror_plus("setgroups");

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1584

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

1585

if(ret == -1){

1586

perror_plus("setenv");

1587

_exit(EX_OSERR);

1588

}

1589

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

1590

if(ret == -1){

1591

perror_plus("setenv");

1592

_exit(EX_OSERR);

1593

}

1594

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

1595

if(ret == -1){

1596

perror_plus("setenv");

1597

_exit(EX_OSERR);

1598

}

1599

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

1600

if(ret == -1){

1601

perror_plus("setenv");

1602

_exit(EX_OSERR);

1603

}

1604

char *delaystring;

1605

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

1606

if(ret == -1){

1607

perror_plus("asprintf");

1608

_exit(EX_OSERR);

1609

}

1610

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

1611

if(ret == -1){

1612

free(delaystring);

1613

perror_plus("setenv");

1614

_exit(EX_OSERR);

1615

}

1616

free(delaystring);

1617

if(connect_to != NULL){

1618

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

1619

if(ret == -1){

1620

perror_plus("setenv");

1621

_exit(EX_OSERR);

1622

}

1623

}

1624

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

1625

perror_plus("execl");

1626

_exit(EXIT_FAILURE);

1627

}

1628

} else {

1629

int status;

1630

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

1631

perror_plus("waitpid");

1632

free(fullname);

1633

continue;

1634

}

1635

if(WIFEXITED(status)){

1636

if(WEXITSTATUS(status) != 0){

1637

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

1638

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

1639

WEXITSTATUS(status));

1640

free(fullname);

1641

continue;

1642

}

1643

} else if(WIFSIGNALED(status)){

1644

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

1645

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

1646

WTERMSIG(status));

1647

free(fullname);

1648

continue;

1649

} else {

1650

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

1651

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

1652

free(fullname);

1653

continue;

1654

}

1655

}

1656

free(fullname);

1657

if(debug){

1658

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

1659

direntry->d_name);

1660

}

1661

}

1662

close(devnull);

1663

}

1664

}

1665

1666

__attribute__((nonnull, warn_unused_result))

1667

error_t bring_up_interface(const char *const interface,

1668

const float delay){

1669

error_t old_errno = errno;

1670

int ret;

1671

struct ifreq network;

1672

unsigned int if_index = if_nametoindex(interface);

1673

if(if_index == 0){

1674

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

1675

errno = old_errno;

1676

return ENXIO;

1677

}

1678

1679

if(quit_now){

1680

errno = old_errno;

1681

return EINTR;

1682

}

1683

1684

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1687

ret_errno = errno;

1688

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

1689

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

1690

errno = old_errno;

1691

return ret_errno;

1692

}

1693

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

1694

1695

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

1696

if(sd == -1){

1697

ret_errno = errno;

1698

perror_plus("socket");

1699

errno = old_errno;

1700

return ret_errno;

1701

}

1702

1703

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1708

errno = old_errno;

1709

return EINTR;

1710

}

1711

1712

if(debug){

1713

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

1714

interface);

1715

}

1716

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1722

1723

#ifdef __linux__

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1735

}

1736

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1739

#ifdef __linux__

1740

if(restore_loglevel){

1741

ret_linux = klogctl(7, NULL, 0);

1742

if(ret_linux == -1){

1743

perror_plus("klogctl");

1744

}

1745

}

1746

#endif /* __linux__ */

1747

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1757

1758

/* Close the socket */

1759

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

1760

if(ret == -1){

1761

perror_plus("close");

1762

}

1763

1764

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

errno = old_errno;

1768

return ioctl_errno;

1769

}

1770

} else if(debug){

1771

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

1772

interface);

1773

}

1774

1775

/* Sleep checking until interface is running.

1776

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

1777

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

1778

if(interface_is_running(interface)){

1779

break;

1780

}

1781

struct timespec sleeptime = { .tv_nsec = 250000000 };

1782

ret = nanosleep(&sleeptime, NULL);

1783

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

1784

perror_plus("nanosleep");

1785

}

1786

}

1787

1788

errno = old_errno;

1789

return 0;

1790

}

1791

1792

__attribute__((nonnull, warn_unused_result))

1793

error_t take_down_interface(const char *const interface){

1794

error_t old_errno = errno;

1795

struct ifreq network;

1796

unsigned int if_index = if_nametoindex(interface);

1797

if(if_index == 0){

1798

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

1799

errno = old_errno;

1800

return ENXIO;

1801

}

1802

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1804

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

1805

ret_errno = errno;

1806

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

1807

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

1808

errno = old_errno;

1809

return ret_errno;

1810

}

1811

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

1812

1813

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

1814

if(sd == -1){

1815

ret_errno = errno;

1816

perror_plus("socket");

1817

errno = old_errno;

1818

return ret_errno;

1819

}

1820

1821

if(debug){

1822

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

1823

interface);

1824

}

1825

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1831

1832

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

1833

ioctl_errno = errno;

1834

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1844

1845

/* Close the socket */

1846

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

1847

if(ret == -1){

1848

perror_plus("close");

1849

}

1850

1851

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

errno = old_errno;

1855

return ioctl_errno;

1856

}

1857

} else if(debug){

1858

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

1859

interface);

1860

}

1861

1862

errno = old_errno;

1863

return 0;

1864

}

1865

1274

1866

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

1867

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

1868

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

1869

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

1870

.interfaces = NULL, .interfaces_size = 0 };

1275

1871

AvahiSServiceBrowser *sb = NULL;

1276

int error;

1872

error_t ret_errno;

1277

1873

int ret;

1278

1874

intmax_t tmpmax;

1279

1875

char *tmp;

1280

1876

int exitcode = EXIT_SUCCESS;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1287

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

1288

bool tempdir_created = false;

1877

char *interfaces_to_take_down = NULL;

1878

size_t interfaces_to_take_down_size = 0;

1879

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

1880

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

1881

char *tempdir = NULL;

1289

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1290

1883

const char *seckey = PATHDIR "/" SECKEY;

1291

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1885

char *interfaces_hooks = NULL;

1292

1886

1293

1887

bool gnutls_initialized = false;

1294

1888

bool gpgme_initialized = false;

1356

1950

.group = 2 },

1357

1951

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

1358

1952

.arg = "SECONDS",

1359

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

1953

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

1954

.group = 2 },

1955

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

1956

.arg = "DIR",

1957

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

1360

1958

.group = 2 },

1361

1959

/*

1362

1960

* These reproduce what we would get without ARGP_NO_HELP

1381

1979

connect_to = arg;

1382

1980

break;

1383

1981

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

1384

interface = arg;

1982

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

1983

arg, (int)',');

1984

if(ret_errno != 0){

1985

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

1986

}

1385

1987

break;

1386

1988

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

1387

1989

seckey = arg;

1411

2013

errno = 0;

1412

2014

retry_interval = strtod(arg, &tmp);

1413

2015

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

1414

or (retry_interval * 1000) > INT_MAX){

2016

or (retry_interval * 1000) > INT_MAX

2017

or retry_interval < 0){

1415

2018

argp_error(state, "Bad retry interval");

1416

2019

}

1417

2020

break;

2021

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

2022

hookdir = arg;

2023

break;

1418

2024

/*

1419

2025

* These reproduce what we would get without ARGP_NO_HELP

1420

2026

*/

1426

2032

argp_state_help(state, state->out_stream,

1427

2033

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

2034

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

1429

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

2035

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

1430

2036

exit(argp_err_exit_status);

1431

2037

break;

1432

2038

default:

1459

2065

{

1460

2066

/* Work around Debian bug #633582:

1461

2067

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

1462

struct stat st;

1463

1464

/* Re-raise priviliges */

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1512

}

2068

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

2075

struct stat st;

2076

2077

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

2078

int seckey_fd = open(seckey, O_RDONLY);

2079

if(seckey_fd == -1){

2080

perror_plus("open");

2081

} else {

2082

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

2083

if(ret == -1){

2084

perror_plus("fstat");

2085

} else {

2086

if(S_ISREG(st.st_mode)

2087

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

2088

ret = fchown(seckey_fd, uid, gid);

2089

if(ret == -1){

2090

perror_plus("fchown");

2091

}

2092

}

2093

}

2094

TEMP_FAILURE_RETRY(close(seckey_fd));

2095

}

2096

}

2097

2098

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

2099

int pubkey_fd = open(pubkey, O_RDONLY);

2100

if(pubkey_fd == -1){

2101

perror_plus("open");

2102

} else {

2103

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

2104

if(ret == -1){

2105

perror_plus("fstat");

2106

} else {

2107

if(S_ISREG(st.st_mode)

2108

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

2109

ret = fchown(pubkey_fd, uid, gid);

2110

if(ret == -1){

2111

perror_plus("fchown");

2112

}

2113

}

2114

}

2115

TEMP_FAILURE_RETRY(close(pubkey_fd));

2116

}

2117

}

2118

2119

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2124

}

2125

}

2126

}

2127

2128

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

2129

{

2130

char *interface = NULL;

2131

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

2132

interface))){

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2136

fprintf_plus(stderr, "Not using nonexisting interface"

2137

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

2138

}

2139

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

2140

interface = NULL;

2141

}

2142

}

2143

}

2144

2145

/* Run network hooks */

2146

{

2147

if(mc.interfaces != NULL){

2148

interfaces_hooks = malloc(mc.interfaces_size);

2149

if(interfaces_hooks == NULL){

2150

perror_plus("malloc");

2151

goto end;

2152

}

2153

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

2154

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

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

1513

2158

}

1514

2159

1515

2160

if(not debug){

1516

2161

avahi_set_log_function(empty_log);

1517

2162

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

1543

2163

1544

2164

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

1545

2165

from the signal handler */

1546

2166

/* Initialize the pseudo-RNG for Avahi */

1547

2167

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

1548

mc.simple_poll = avahi_simple_poll_new();

1549

if(mc.simple_poll == NULL){

1550

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

2168

simple_poll = avahi_simple_poll_new();

2169

if(simple_poll == NULL){

2170

fprintf_plus(stderr,

2171

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

1551

2172

exitcode = EX_UNAVAILABLE;

1552

2173

goto end;

1553

2174

}

1615

2236

}

1616

2237

}

1617

2238

1618

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

1619

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

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

if(if_index == 0){

1622

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

1623

exitcode = EX_UNAVAILABLE;

1624

goto end;

1625

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

#ifdef __linux__

1639

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1641

ret = klogctl(8, NULL, 5);

1642

bool restore_loglevel = true;

1643

if(ret == -1){

1644

restore_loglevel = false;

1645

perror_plus("klogctl");

1646

}

1647

#endif /* __linux__ */

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1653

#ifdef __linux__

1654

if(restore_loglevel){

1655

ret = klogctl(7, NULL, 0);

1656

if(ret == -1){

1657

perror_plus("klogctl");

1658

}

1659

}

1660

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

goto end;

1668

}

1669

strcpy(network.ifr_name, interface);

1670

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

1671

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1673

#ifdef __linux__

1674

if(restore_loglevel){

1675

ret = klogctl(7, NULL, 0);

1676

if(ret == -1){

1677

perror_plus("klogctl");

1678

}

1679

}

1680

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1688

goto end;

1689

}

1690

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

1691

network.ifr_flags |= IFF_UP;

1692

take_down_interface = true;

1693

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

1694

if(ret == -1){

1695

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1698

#ifdef __linux__

1699

if(restore_loglevel){

1700

ret = klogctl(7, NULL, 0);

1701

if(ret == -1){

1702

perror_plus("klogctl");

2239

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

2240

if(mc.interfaces == NULL){

2241

struct dirent **direntries;

2242

/* Look for any good interfaces */

2243

ret = scandir(sys_class_net, &direntries, good_interface,

2244

alphasort);

2245

if(ret >= 1){

2246

/* Add all found interfaces to interfaces list */

2247

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

2248

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

2249

direntries[i]->d_name);

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("argz_add");

2253

continue;

2254

}

2255

if(debug){

2256

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

2257

direntries[i]->d_name);

2258

}

2259

}

2260

free(direntries);

2261

} else {

2262

free(direntries);

2263

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

2264

exitcode = EXIT_FAILURE;

2265

goto end;

2266

}

2267

}

2268

2269

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

2270

{

2271

char *interface = NULL;

2272

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

2273

interface))){

2274

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

2275

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

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

while((interface = argz_next(mc.interfaces,

2281

mc.interfaces_size, interface))){

2282

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

2283

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

2284

interface);

2285

interface = NULL;

1703

2286

}

1704

2287

}

1705

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

goto end;

1713

}

1714

}

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

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

1719

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1721

} else if(network.ifr_flags & IFF_RUNNING){

1722

2288

break;

1723

2289

}

1724

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

ret = nanosleep(&sleeptime, NULL);

1726

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

1727

perror_plus("nanosleep");

1728

}

1729

}

1730

if(not take_down_interface){

1731

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

1732

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

1733

if(ret == -1){

1734

perror_plus("close");

1735

}

1736

}

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

/* Restores kernel loglevel to default */

1740

ret = klogctl(7, NULL, 0);

1741

if(ret == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

1754

} else {

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

1760

}

2290

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2292

if(not interface_was_up){

2293

if(errno != 0){

2294

perror_plus("Failed to bring up interface");

2295

} else {

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2300

perror_plus("argz_add");

2301

}

2302

}

2303

}

2304

}

2305

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

2306

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

2307

}

2308

}

2309

2310

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

2311

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

2312

if(debug){

2313

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

2314

mc.interfaces);

2315

}

2316

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

1761

2317

}

1762

2318

1763

2319

if(quit_now){

1764

2320

goto end;

1765

2321

}

1766

2322

1767

ret = init_gnutls_global(pubkey, seckey);

2323

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

1768

2324

if(ret == -1){

1769

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

2325

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

1770

2326

exitcode = EX_UNAVAILABLE;

1771

2327

goto end;

1772

2328

} else {

1777

2333

goto end;

1778

2334

}

1779

2335

1780

if(mkdtemp(tempdir) == NULL){

2336

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

2337

tempdir = mkdtemp(run_tempdir);

2338

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

2339

if(debug){

2340

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

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

1781

2346

perror_plus("mkdtemp");

1782

2347

goto end;

1783

2348

}

1784

tempdir_created = true;

1785

2349

1786

2350

if(quit_now){

1787

2351

goto end;

1788

2352

}

1789

2353

1790

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

1791

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

2354

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

2355

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

1792

2356

exitcode = EX_UNAVAILABLE;

1793

2357

goto end;

1794

2358

} else {

1803

2367

/* Connect directly, do not use Zeroconf */

1804

2368

/* (Mainly meant for debugging) */

1805

2369

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

2370

1806

2371

if(address == NULL){

1807

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

2372

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

1808

2373

exitcode = EX_USAGE;

1809

2374

goto end;

1810

2375

}

1813

2378

goto end;

1814

2379

}

1815

2380

1816

uint16_t port;

2381

in_port_t port;

1817

2382

errno = 0;

1818

2383

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

1819

2384

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

1820

or tmpmax != (uint16_t)tmpmax){

1821

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

2385

or tmpmax != (in_port_t)tmpmax){

2386

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

1822

2387

exitcode = EX_USAGE;

1823

2388

goto end;

1824

2389

}

1825

2390

1826

2391

if(quit_now){

1827

2392

goto end;

1828

2393

}

1829

2394

1830

port = (uint16_t)tmpmax;

2395

port = (in_port_t)tmpmax;

1831

2396

*address = '\0';

1832

address = connect_to;

1833

2397

/* Colon in address indicates IPv6 */

1834

2398

int af;

1835

if(strchr(address, ':') != NULL){

2399

if(strchr(connect_to, ':') != NULL){

1836

2400

af = AF_INET6;

2401

/* Accept [] around IPv6 address - see RFC 5952 */

2402

if(connect_to[0] == '[' and address[-1] == ']')

2403

{

2404

connect_to++;

2405

address[-1] = '\0';

2406

}

1837

2407

} else {

1838

2408

af = AF_INET;

1839

2409

}

2410

address = connect_to;

1840

2411

1841

2412

if(quit_now){

1842

2413

goto end;

1843

2414

}

1844

2415

1845

2416

while(not quit_now){

1846

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

2417

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

2418

&mc);

1847

2419

if(quit_now or ret == 0){

1848

2420

break;

1849

2421

}

1850

sleep((int)retry_interval or 1);

1851

};

1852

1853

if (not quit_now){

2422

if(debug){

2423

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

2424

(int)retry_interval);

2425

}

2426

sleep((unsigned int)retry_interval);

2427

}

2428

2429

if(not quit_now){

1854

2430

exitcode = EXIT_SUCCESS;

1855

2431

}

1856

2432

1857

2433

goto end;

1858

2434

}

1859

2435

1871

2447

config.publish_domain = 0;

1872

2448

1873

2449

/* Allocate a new server */

1874

mc.server = avahi_server_new(avahi_simple_poll_get

1875

(mc.simple_poll), &config, NULL,

1876

NULL, &error);

2450

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2451

&config, NULL, NULL, &ret_errno);

1877

2452

1878

2453

/* Free the Avahi configuration data */

1879

2454

avahi_server_config_free(&config);

1881

2456

1882

2457

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

1883

2458

if(mc.server == NULL){

1884

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

1885

avahi_strerror(error));

2459

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

2460

avahi_strerror(ret_errno));

1886

2461

exitcode = EX_UNAVAILABLE;

1887

2462

goto end;

1888

2463

}

1894

2469

/* Create the Avahi service browser */

1895

2470

sb = avahi_s_service_browser_new(mc.server, if_index,

1896

2471

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1897

NULL, 0, browse_callback, NULL);

2472

NULL, 0, browse_callback,

2473

(void *)&mc);

1898

2474

if(sb == NULL){

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2475

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

2476

avahi_strerror(avahi_server_errno(mc.server)));

1901

2477

exitcode = EX_UNAVAILABLE;

1902

2478

goto end;

1903

2479

}

1909

2485

/* Run the main loop */

1910

2486

1911

2487

if(debug){

1912

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

2488

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

1913

2489

}

1914

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

2490

2491

ret = avahi_loop_with_timeout(simple_poll,

2492

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

1917

2493

if(debug){

1918

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

1919

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

2494

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

2495

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

1920

2496

}

1921

2497

1922

2498

end:

1923

2499

1924

2500

if(debug){

1925

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

2501

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

1926

2502

}

1927

2503

1928

2504

/* Cleanup things */

2505

free(mc.interfaces);

2506

1929

2507

if(sb != NULL)

1930

2508

avahi_s_service_browser_free(sb);

1931

2509

1932

2510

if(mc.server != NULL)

1933

2511

avahi_server_free(mc.server);

1934

2512

1935

if(mc.simple_poll != NULL)

1936

avahi_simple_poll_free(mc.simple_poll);

2513

if(simple_poll != NULL)

2514

avahi_simple_poll_free(simple_poll);

1937

2515

1938

2516

if(gnutls_initialized){

1939

2517

gnutls_certificate_free_credentials(mc.cred);

1944

2522

if(gpgme_initialized){

1945

2523

gpgme_release(mc.ctx);

1946

2524

}

1947

2525

1948

2526

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

1949

2527

has seen */

1950

2528

if(mc.current_server != NULL){

1956

2534

}

1957

2535

}

1958

2536

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

2537

/* Re-raise privileges */

2538

{

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

1966

2565

}

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1976

}

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

1988

2570

}

1989

2571

}

1990

2572

2573

free(interfaces_to_take_down);

2574

free(interfaces_hooks);

2575

1991

2576

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

1992

if(tempdir_created){

2577

if(tempdir != NULL){

1993

2578

struct dirent **direntries = NULL;

1994

2579

struct dirent *direntry = NULL;

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

2580

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

2581

alphasort);

2582

if(numentries > 0){

2583

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

1998

2584

direntry = direntries[i];

1999

2585

char *fullname = NULL;

2000

2586

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

2005

2591

}

2006

2592

ret = remove(fullname);

2007

2593

if(ret == -1){

2008

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

2009

strerror(errno));

2594

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

2595

strerror(errno));

2010

2596

}

2011

2597

free(fullname);

2012

2598

}

2013

2599

}

2014

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2600

2601

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

2017

2602

free(direntries);

2018

if (ret == -1){

2603

if(numentries == -1){

2019

2604

perror_plus("scandir");

2020

2605

}

2021

2606

ret = rmdir(tempdir);