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#define _LARGEFILE_SOURCE
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#define _FILE_OFFSET_BITS 64
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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#include <stdint.h> /* uint16_t, uint32_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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#include <stdbool.h> /* bool, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
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strerror(), asprintf(), strcpy() */
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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SOCK_STREAM, INET6_ADDRSTRLEN,
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#include <inttypes.h> /* PRIu16 */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton(),
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#include <assert.h> /* assert() */
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#include <errno.h> /* perror(), errno */
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#include <time.h> /* time() */
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#include <net/if.h> /* if_nametoindex */
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#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), setuid(),
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#include <netinet/in.h>
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#include <arpa/inet.h> /* inet_pton(), htons */
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#include <iso646.h> /* not, 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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argp_parse(), ARGP_KEY_ARG,
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ARGP_KEY_END, ARGP_ERR_UNKNOWN */
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/* All Avahi types, constants and functions
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#include <avahi-core/core.h>
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#include <avahi-core/lookup.h>
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#include <avahi-core/log.h>
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#include <avahi-common/malloc.h>
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#include <avahi-common/error.h>
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#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
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init_gnutls_session(),
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#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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/* Mandos client part */
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#include <sys/types.h> /* socket(), inet_pton() */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton() */
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#include <gnutls/gnutls.h> /* All GnuTLS stuff */
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#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
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#include <unistd.h> /* close() */
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#include <netinet/in.h>
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#include <stdbool.h> /* true */
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#include <string.h> /* memset */
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#include <arpa/inet.h> /* inet_pton() */
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#include <iso646.h> /* not */
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#include <net/if.h> /* IF_NAMESIZE */
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#include <gpgme.h> /* All GPGME types, constants and
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GPGME_PROTOCOL_OpenPGP,
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#include <errno.h> /* perror() */
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#define BUFFER_SIZE 256
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static const char *keydir = "/conf/conf.d/mandos";
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static const char *pubkeyfile = "pubkey.txt";
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static const char *seckeyfile = "seckey.txt";
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bool debug = false;
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static const char *keydir = "/conf/conf.d/mandos";
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static const char mandos_protocol_version[] = "1";
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const char *argp_program_version = "password-request 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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/* Used for passing in values through the Avahi callback functions */
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/* Used for passing in values through all the callback functions */
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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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gnutls_dh_params_t dh_params;
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const char *priority;
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* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
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* "buffer_capacity" is how much is currently allocated,
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* "buffer_length" is how much is already used.
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size_t adjustbuffer(char **buffer, size_t buffer_length,
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size_t buffer_capacity){
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if (buffer_length + BUFFER_SIZE > buffer_capacity){
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*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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buffer_capacity += BUFFER_SIZE;
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return buffer_capacity;
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* Decrypt OpenPGP data using keyrings in HOMEDIR.
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* Returns -1 on error
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/* OpenPGP credentials */
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gnutls_certificate_allocate_credentials(&mc->cred);
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if (ret != GNUTLS_E_SUCCESS){
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if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
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!= GNUTLS_E_SUCCESS) {
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fprintf (stderr, "GnuTLS memory error: %s\n",
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safer_gnutls_strerror(ret));
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gnutls_global_deinit ();
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fprintf(stderr, "Attempting to use OpenPGP certificate %s"
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" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
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" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
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ret = gnutls_certificate_set_openpgp_key_file
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(mc->cred, pubkeyfilename, seckeyfilename,
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GNUTLS_OPENPGP_FMT_BASE64);
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(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
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if (ret != GNUTLS_E_SUCCESS) {
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"Error[%d] while reading the OpenPGP key pair ('%s',"
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" '%s')\n", ret, pubkeyfilename, seckeyfilename);
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" '%s')\n", ret, pubkeyfile, seckeyfile);
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fprintf(stdout, "The GnuTLS error is: %s\n",
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safer_gnutls_strerror(ret));
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/* GnuTLS server initialization */
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ret = gnutls_dh_params_init(&mc->dh_params);
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ret = gnutls_dh_params_init(dh_params);
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if (ret != GNUTLS_E_SUCCESS) {
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fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
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" %s\n", safer_gnutls_strerror(ret));
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ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
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ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
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if (ret != GNUTLS_E_SUCCESS) {
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fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
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safer_gnutls_strerror(ret));
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gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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gnutls_certificate_free_credentials(mc->cred);
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gnutls_global_deinit();
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static int init_gnutls_session(mandos_context *mc,
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gnutls_session_t *session){
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gnutls_certificate_set_dh_params(mc->cred, *dh_params);
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/* GnuTLS session creation */
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ret = gnutls_init(session, GNUTLS_SERVER);
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if (ret != GNUTLS_E_SUCCESS){
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const char *interface = "eth0";
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struct ifreq network;
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char *connect_to = NULL;
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AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
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char *pubkeyfilename = NULL;
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char *seckeyfilename = NULL;
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const char *pubkeyname = "pubkey.txt";
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const char *seckeyname = "seckey.txt";
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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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bool gnutls_initalized = false;
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struct argp_option options[] = {
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{ .name = "debug", .key = 128,
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.doc = "Debug mode", .group = 3 },
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{ .name = "connect", .key = 'c',
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.doc = "Connect directly to a sepcified mandos server",
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{ .name = "interface", .key = 'i',
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.doc = "Interface that Avahi will conntect through",
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{ .name = "keydir", .key = 'd',
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.doc = "Directory where the openpgp keyring is",
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{ .name = "seckey", .key = 's',
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.doc = "Secret openpgp key for gnutls authentication",
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{ .name = "pubkey", .key = 'p',
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.doc = "Public openpgp key for gnutls authentication",
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{ .name = "dh-bits", .key = 129,
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.doc = "dh-bits to use in gnutls communication",
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{ .name = "priority", .key = 130,
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.doc = "GNUTLS priority", .group = 1 },
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error_t parse_opt (int key, char *arg,
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struct argp_state *state) {
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/* Get the INPUT argument from `argp_parse', which we know is
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a pointer to our plugin list pointer. */
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/* Temporary int to get the address of for getopt_long */
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int debug_int = debug ? 1 : 0;
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struct option long_options[] = {
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{"debug", no_argument, &debug_int, 1},
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{"connect", required_argument, NULL, 'c'},
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{"interface", required_argument, NULL, 'i'},
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{"keydir", required_argument, NULL, 'd'},
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{"seckey", required_argument, NULL, 's'},
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{"pubkey", required_argument, NULL, 'p'},
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{"dh-bits", required_argument, NULL, 'D'},
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{"priority", required_argument, NULL, 'P'},
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int option_index = 0;
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ret = getopt_long (argc, argv, "i:", long_options,
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mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
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mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
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perror("strtol");
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exit(EXIT_FAILURE);
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mc.priority = optarg;
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return ARGP_ERR_UNKNOWN;
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struct argp argp = { .options = options, .parser = parse_opt,
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.doc = "Mandos client -- Get and decrypt"
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" passwords from mandos server" };
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ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
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if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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exitcode = EXIT_FAILURE;
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pubkeyfilename = combinepath(keydir, pubkeyname);
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if (pubkeyfilename == NULL){
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perror("combinepath");
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exitcode = EXIT_FAILURE;
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seckeyfilename = combinepath(keydir, seckeyname);
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if (seckeyfilename == NULL){
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perror("combinepath");
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exitcode = EXIT_FAILURE;
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ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
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fprintf(stderr, "init_gnutls_global failed\n");
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exitcode = EXIT_FAILURE;
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gnutls_initalized = true;
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/* If the interface is down, bring it up */
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sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
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exitcode = EXIT_FAILURE;
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strcpy(network.ifr_name, interface); /* Spurious warning */
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ret = ioctl(sd, SIOCGIFFLAGS, &network);
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perror("ioctl SIOCGIFFLAGS");
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exitcode = EXIT_FAILURE;
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if((network.ifr_flags & IFF_UP) == 0){
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network.ifr_flags |= IFF_UP;
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ret = ioctl(sd, SIOCSIFFLAGS, &network);
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perror("ioctl SIOCSIFFLAGS");
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exitcode = EXIT_FAILURE;
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/* getopt_long() has already printed a message about the
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unrcognized option, so just exit. */
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/* Set the global debug flag from the temporary int */
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debug = debug_int ? true : false;
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pubkeyfile = combinepath(keydir, pubkeyfile);
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if (pubkeyfile == NULL){
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perror("combinepath");
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exitcode = EXIT_FAILURE;
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seckeyfile = combinepath(keydir, seckeyfile);
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if (seckeyfile == NULL){
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perror("combinepath");
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if_index = (AvahiIfIndex) if_nametoindex(interface);
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char *address = strrchr(connect_to, ':');
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if(address == NULL){
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fprintf(stderr, "No colon in address\n");
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exitcode = EXIT_FAILURE;
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uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
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perror("Bad port number");
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exitcode = EXIT_FAILURE;
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address = connect_to;
956
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ret = start_mandos_communication(address, port, if_index, &mc);
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exitcode = EXIT_FAILURE;
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exitcode = EXIT_SUCCESS;
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/* If the interface is down, bring it up */
804
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
807
exitcode = EXIT_FAILURE;
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strcpy(network.ifr_name, interface); /* Spurious warning */
811
ret = ioctl(sd, SIOCGIFFLAGS, &network);
813
perror("ioctl SIOCGIFFLAGS");
814
exitcode = EXIT_FAILURE;
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if((network.ifr_flags & IFF_UP) == 0){
818
network.ifr_flags |= IFF_UP;
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ret = ioctl(sd, SIOCSIFFLAGS, &network);
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perror("ioctl SIOCSIFFLAGS");
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exitcode = EXIT_FAILURE;