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* "browse_callback", and parts of "main".
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* Everything else is
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* Copyright © 2008-2020 Teddy Hogeborn
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* Copyright © 2008-2020 Björn Påhlsson
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* This file is part of Mandos.
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* Copyright © 2008-2016 Teddy Hogeborn
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* Copyright © 2008-2016 Björn Påhlsson
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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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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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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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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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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->file_name != NULL){
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fprintf_plus(stderr, "File name: %s\n", result->file_name);
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for(gpgme_recipient_t r = result->recipients; r != NULL;
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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_plus(stderr, "Public key algorithm: %s\n",
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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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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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fprintf_plus(stderr, "Secret key available: %s\n",
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r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
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recipient->status == GPG_ERR_NO_SECKEY
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recipient = recipient->next;
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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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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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#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 key pair ('%s',"
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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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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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} 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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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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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))
820
int raise_privileges(void){
821
int old_errno = errno;
823
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))
832
int raise_privileges_permanently(void){
833
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))
848
int lower_privileges(void){
849
int old_errno = errno;
851
if(seteuid(uid) == -1){
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
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if(setuid(uid) == -1){
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/* 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,
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2107
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int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
1913
runnable_hook, alphasort);
2109
1914
if(numhooks == -1){
2110
1915
perror_plus("scandir");
2114
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struct dirent *direntry;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
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for(int i = 0; i < numhooks; i++){
2117
1926
direntry = direntries[i];
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2277
int main(int argc, char *argv[]){
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2278
mandos_context mc = { .server = NULL, .dh_bits = 0,
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#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
2279
.priority = "SECURE256:!CTYPE-X.509"
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2280
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
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.current_server = NULL, .interfaces = NULL,
2481
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.interfaces_size = 0 };
2482
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AvahiSServiceBrowser *sb = NULL;
2550
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{ .name = "pubkey", .key = 'p',
2552
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.doc = "OpenPGP public key file base name",
2554
{ .name = "tls-privkey", .key = 't',
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
{ .name = "tls-pubkey", .key = 'T',
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2570
2351
{ .name = "dh-bits", .key = 129,
2572
2353
.doc = "Bit length of the prime number used in the"
2678
2449
argp_state_help(state, state->out_stream,
2679
2450
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
2451
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
2452
case -3: /* --usage */
2683
2453
argp_state_help(state, state->out_stream,
2684
2454
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
2455
case 'V': /* --version */
2687
2456
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
2457
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
3014
2771
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3016
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3019
2773
fprintf_plus(stderr, "init_gnutls_global failed\n");
3020
2774
exitcode = EX_UNAVAILABLE;