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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
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setgid(), pause(), _exit(),
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unlinkat(), lstat(), symlink() */
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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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/* Set effective uid to 0, return errno */
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__attribute__((warn_unused_result))
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int raise_privileges(void){
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int old_errno = errno;
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if(seteuid(0) == -1){
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/* Set effective and real user ID to 0. Return errno. */
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__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
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int old_errno = errno;
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int ret = raise_privileges();
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/* Set effective user ID to unprivileged saved user ID */
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__attribute__((warn_unused_result))
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int lower_privileges(void){
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int old_errno = errno;
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if(seteuid(uid) == -1){
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/* Lower privileges permanently */
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__attribute__((warn_unused_result))
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int lower_privileges_permanently(void){
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int old_errno = errno;
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if(setuid(uid) == -1){
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* Initialize GPGME.
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/* Workaround for systems without a real-time clock; see also
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Debian bug #894495: <https://bugs.debian.org/894495> */
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time_t currtime = time(NULL);
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if(currtime != (time_t)-1){
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if(gmtime_r(&currtime, &tm) == NULL) {
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perror_plus("gmtime_r");
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if(tm.tm_year != 70 or tm.tm_mon != 0){
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fprintf_plus(stderr, "System clock is January 1970");
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fprintf_plus(stderr, "System clock is invalid");
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ret = fstat(fd, &keystat);
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perror_plus("fstat");
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ret = raise_privileges();
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perror_plus("Failed to raise privileges");
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"Setting system clock to key file mtime");
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if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
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perror_plus("clock_settime");
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ret = lower_privileges();
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perror_plus("Failed to lower privileges");
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rc = gpgme_data_new_from_fd(&pgp_data, fd);
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if(rc != GPG_ERR_NO_ERROR){
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fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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gpgme_import_result_t import_result
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= gpgme_op_import_result(mc->ctx);
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if((import_result->imported < 1
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or import_result->not_imported > 0)
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and import_result->unchanged == 0){
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fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
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"The total number of considered keys: %d\n",
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import_result->considered);
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"The number of keys without user ID: %d\n",
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import_result->no_user_id);
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"The total number of imported keys: %d\n",
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import_result->imported);
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fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
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import_result->imported_rsa);
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fprintf_plus(stderr, "The number of unchanged keys: %d\n",
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import_result->unchanged);
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fprintf_plus(stderr, "The number of new user IDs: %d\n",
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import_result->new_user_ids);
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fprintf_plus(stderr, "The number of new sub keys: %d\n",
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import_result->new_sub_keys);
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fprintf_plus(stderr, "The number of new signatures: %d\n",
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import_result->new_signatures);
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fprintf_plus(stderr, "The number of new revocations: %d\n",
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import_result->new_revocations);
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"The total number of secret keys read: %d\n",
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import_result->secret_read);
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"The number of imported secret keys: %d\n",
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import_result->secret_imported);
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"The number of unchanged secret keys: %d\n",
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import_result->secret_unchanged);
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fprintf_plus(stderr, "The number of keys not imported: %d\n",
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import_result->not_imported);
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for(gpgme_import_status_t import_status
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= import_result->imports;
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import_status != NULL;
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import_status = import_status->next){
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fprintf_plus(stderr, "Import status for key: %s\n",
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if(import_status->result != GPG_ERR_NO_ERROR){
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fprintf_plus(stderr, "Import result: %s: %s\n",
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gpgme_strsource(import_status->result),
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gpgme_strerror(import_status->result));
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fprintf_plus(stderr, "Key status:\n");
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import_status->status & GPGME_IMPORT_NEW
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? "The key was new.\n"
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: "The key was not new.\n");
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import_status->status & GPGME_IMPORT_UID
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? "The key contained new user IDs.\n"
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: "The key did not contain new user IDs.\n");
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import_status->status & GPGME_IMPORT_SIG
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? "The key contained new signatures.\n"
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: "The key did not contain new signatures.\n");
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import_status->status & GPGME_IMPORT_SUBKEY
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? "The key contained new sub keys.\n"
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: "The key did not contain new sub keys.\n");
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import_status->status & GPGME_IMPORT_SECRET
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? "The key contained a secret key.\n"
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: "The key did not contain a secret key.\n");
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if(result == NULL){
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fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
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fprintf_plus(stderr, "Unsupported algorithm: %s\n",
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result->unsupported_algorithm);
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fprintf_plus(stderr, "Wrong key usage: %u\n",
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result->wrong_key_usage);
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if(result->unsupported_algorithm != NULL) {
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fprintf_plus(stderr, "Unsupported algorithm: %s\n",
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result->unsupported_algorithm);
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fprintf_plus(stderr, "Wrong key usage: %s\n",
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result->wrong_key_usage ? "Yes" : "No");
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if(result->file_name != NULL){
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fprintf_plus(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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for(gpgme_recipient_t r = result->recipients; r != NULL;
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fprintf_plus(stderr, "Public key algorithm: %s\n",
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gpgme_pubkey_algo_name
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(recipient->pubkey_algo));
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fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
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gpgme_pubkey_algo_name(r->pubkey_algo));
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fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
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fprintf_plus(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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r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
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fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
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" secret key %s as GnuTLS credentials\n",
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fprintf_plus(stderr, "Attempting to use public key %s and"
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" private key %s as GnuTLS credentials\n",
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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ret = gnutls_certificate_set_rawpk_key_file
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(mc->cred, pubkeyfilename, seckeyfilename,
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GNUTLS_X509_FMT_PEM, /* format */
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GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
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0, /* names_length */
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GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
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0); /* pkcs11_flags */
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#elif GNUTLS_VERSION_NUMBER < 0x030600
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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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#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr,
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"Error[%d] while reading the OpenPGP key pair ('%s',"
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"Error[%d] while reading the key pair ('%s',"
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" '%s')\n", ret, pubkeyfilename, seckeyfilename);
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fprintf_plus(stderr, "The GnuTLS error is: %s\n",
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safer_gnutls_strerror(ret));
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safer_gnutls_strerror(ret));
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fprintf_plus(stderr, "DH bits explicitly set to %u\n",
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ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
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" bits): %s\n", mc->dh_bits,
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safer_gnutls_strerror(ret));
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} else { /* dh_bits != 0 */
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fprintf_plus(stderr, "DH bits explicitly set to %u\n",
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ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
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" bits): %s\n", mc->dh_bits,
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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_set_dh_params(mc->cred, mc->dh_params);
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1029
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
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__attribute__((unused)) const char *txt){}
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/* Set effective uid to 0, return errno */
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__attribute__((warn_unused_result))
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int raise_privileges(void){
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int old_errno = errno;
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if(seteuid(0) == -1){
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/* Set effective and real user ID to 0. Return errno. */
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__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
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int old_errno = errno;
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int ret = raise_privileges();
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/* Set effective user ID to unprivileged saved user ID */
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__attribute__((warn_unused_result))
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int lower_privileges(void){
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int old_errno = errno;
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if(seteuid(uid) == -1){
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/* Lower privileges permanently */
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__attribute__((warn_unused_result))
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int lower_privileges_permanently(void){
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int old_errno = errno;
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if(setuid(uid) == -1){
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1032
/* Helper function to add_local_route() and delete_local_route() */
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__attribute__((nonnull, warn_unused_result))
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static bool add_delete_local_route(const bool add,
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int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
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perror_plus("open(\"/dev/null\", O_RDONLY)");
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int numhooks = scandirat(hookdir_fd, ".", &direntries,
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runnable_hook, alphasort);
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if(numhooks == -1){
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perror_plus("scandir");
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struct dirent *direntry;
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int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
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perror_plus("open(\"/dev/null\", O_RDONLY)");
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for(int i = 0; i < numhooks; i++){
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direntry = direntries[i];
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int main(int argc, char *argv[]){
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mandos_context mc = { .server = NULL, .dh_bits = 0,
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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.priority = "SECURE128:!CTYPE-X.509"
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":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
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#elif GNUTLS_VERSION_NUMBER < 0x030600
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.priority = "SECURE256:!CTYPE-X.509"
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":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
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#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
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.current_server = NULL, .interfaces = NULL,
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.interfaces_size = 0 };
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AvahiSServiceBrowser *sb = NULL;
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{ .name = "pubkey", .key = 'p',
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.doc = "OpenPGP public key file base name",
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{ .name = "tls-privkey", .key = 't',
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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.doc = "TLS private key file base name",
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.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
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{ .name = "tls-pubkey", .key = 'T',
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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.doc = "TLS public key file base name",
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.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
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{ .name = "dh-bits", .key = 129,
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.doc = "Bit length of the prime number used in the"
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argp_state_help(state, state->out_stream,
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(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
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& ~(unsigned int)ARGP_HELP_EXIT_OK);
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__builtin_unreachable();
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case -3: /* --usage */
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
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case 'V': /* --version */
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fprintf_plus(state->out_stream, "%s\n", argp_program_version);
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2688
exit(argp_err_exit_status);
3011
#if GNUTLS_VERSION_NUMBER >= 0x030606
3012
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3013
#elif GNUTLS_VERSION_NUMBER < 0x030600
2785
3014
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3016
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
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3019
fprintf_plus(stderr, "init_gnutls_global failed\n");
2788
3020
exitcode = EX_UNAVAILABLE;