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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() */
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
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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(), memcpy(), strcpy() */
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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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fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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plaintext_length = -1;
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gpgme_decrypt_result_t result;
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result = gpgme_op_decrypt_result(ctx);
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fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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fprintf(stderr, "Unsupported algorithm: %s\n",
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result->unsupported_algorithm);
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fprintf(stderr, "Wrong key usage: %u\n",
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result->wrong_key_usage);
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if(result->file_name != NULL){
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fprintf(stderr, "File name: %s\n", result->file_name);
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gpgme_recipient_t recipient;
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recipient = result->recipients;
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while(recipient != NULL){
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fprintf(stderr, "Public key algorithm: %s\n",
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gpgme_pubkey_algo_name(recipient->pubkey_algo));
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fprintf(stderr, "Key ID: %s\n", recipient->keyid);
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fprintf(stderr, "Secret key available: %s\n",
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recipient->status == GPG_ERR_NO_SECKEY
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recipient = recipient->next;
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goto decrypt_end;
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fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
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gpgme_decrypt_result_t result;
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result = gpgme_op_decrypt_result(ctx);
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fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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fprintf(stderr, "Unsupported algorithm: %s\n",
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result->unsupported_algorithm);
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fprintf(stderr, "Wrong key usage: %u\n",
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result->wrong_key_usage);
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if(result->file_name != NULL){
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fprintf(stderr, "File name: %s\n", result->file_name);
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gpgme_recipient_t recipient;
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recipient = result->recipients;
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while(recipient != NULL){
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fprintf(stderr, "Public key algorithm: %s\n",
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gpgme_pubkey_algo_name(recipient->pubkey_algo));
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fprintf(stderr, "Key ID: %s\n", recipient->keyid);
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fprintf(stderr, "Secret key available: %s\n",
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recipient->status == GPG_ERR_NO_SECKEY
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recipient = recipient->next;
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/* Seek back to the beginning of the GPGME plaintext data buffer */
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if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
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perror("pgpme_data_seek");
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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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fprintf (stderr, "GnuTLS memory error: %s\n",
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fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
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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", pubkeyfile,
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" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
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ret = gnutls_certificate_set_openpgp_key_file
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(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
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(mc->cred, pubkeyfilename, seckeyfilename,
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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, pubkeyfile, seckeyfile);
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" '%s')\n", ret, pubkeyfilename, seckeyfilename);
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fprintf(stdout, "The GnuTLS error is: %s\n",
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safer_gnutls_strerror(ret));
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fprintf(stderr, "Binding to interface %s\n", interface);
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memset(&to,0,sizeof(to)); /* Spurious warning */
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memset(&to, 0, sizeof(to));
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to.in6.sin6_family = AF_INET6;
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/* It would be nice to have a way to detect if we were passed an
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IPv4 address here. Now we assume an IPv6 address. */
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/* Combines file name and path and returns the malloced new
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string. some sane checks could/should be added */
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static const char *combinepath(const char *first, const char *second){
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size_t f_len = strlen(first);
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size_t s_len = strlen(second);
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char *tmp = malloc(f_len + s_len + 2);
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static char *combinepath(const char *first, const char *second){
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int ret = asprintf(&tmp, "%s/%s", first, second);
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memcpy(tmp, first, f_len); /* Spurious warning */
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memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
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tmp[f_len + 1 + s_len] = '\0';
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char *connect_to = NULL;
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AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
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const char *pubkeyfile = "pubkey.txt";
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const char *seckeyfile = "seckey.txt";
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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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.dh_bits = 1024, .priority = "SECURE256"
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":!CTYPE-X.509:+CTYPE-OPENPGP" };
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bool gnutls_initalized = false;
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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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.arg = "ADDRESS:PORT",
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.doc = "Connect directly to a specific 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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.doc = "Interface that will be used to search for Mandos"
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{ .name = "keydir", .key = 'd',
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.doc = "Directory where the openpgp keyring is",
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.doc = "Directory to read the OpenPGP key files from",
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{ .name = "seckey", .key = 's',
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.doc = "Secret openpgp key for gnutls authentication",
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.doc = "OpenPGP secret key file base name",
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{ .name = "pubkey", .key = 'p',
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.doc = "Public openpgp key for gnutls authentication",
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.doc = "OpenPGP public key file base name",
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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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.doc = "Bit length of the prime number used in the"
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" Diffie-Hellman key exchange",
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{ .name = "priority", .key = 130,
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.doc = "GNUTLS priority", .group = 1 },
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.doc = "GnuTLS priority string for the TLS handshake",
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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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case 128: /* --debug */
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case 'c': /* --connect */
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connect_to = arg;
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case 'i': /* --interface */
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case 'd': /* --keydir */
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case 's': /* --seckey */
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case 'p': /* --pubkey */
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case 129: /* --dh-bits */
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mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
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exit(EXIT_FAILURE);
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case 130: /* --priority */
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mc.priority = arg;
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case ARGP_KEY_ARG:
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argp_usage (state);
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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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" passwords from a 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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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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exitcode = EXIT_FAILURE;
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ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
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pubkeyfilename = combinepath(keydir, pubkeyname);
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if (pubkeyfilename == NULL){
875
perror("combinepath");
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exitcode = EXIT_FAILURE;
880
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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config.publish_addresses = 0;
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config.publish_workstation = 0;
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config.publish_domain = 0;
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/* Allocate a new server */
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mc.server = avahi_server_new(avahi_simple_poll_get
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(mc.simple_poll), &config, NULL,
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/* Free the Avahi configuration data */
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avahi_server_config_free(&config);