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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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uid_t, gid_t, open(), opendir(), DIR */
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#include <sys/stat.h> /* open() */
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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 <fcntl.h> /* open() */
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#include <dirent.h> /* opendir(), struct dirent, readdir() */
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#include <inttypes.h> /* PRIu16 */
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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> /* 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 <netinet/in.h>
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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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* Decrypt OpenPGP data using keyrings in HOMEDIR.
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* Returns -1 on error
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static ssize_t pgp_packet_decrypt (const char *cryptotext,
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const char *homedir){
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gpgme_data_t dh_crypto, dh_plain;
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static bool init_gpgme(mandos_context *mc, const char *seckey,
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const char *pubkey, const char *tempdir){
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gpgme_error_t rc;
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size_t plaintext_capacity = 0;
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ssize_t plaintext_length = 0;
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gpgme_engine_info_t engine_info;
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* Helper function to insert pub and seckey to the enigne keyring.
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bool import_key(const char *filename){
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gpgme_data_t pgp_data;
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fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
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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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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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ret = TEMP_FAILURE_RETRY(close(fd));
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gpgme_data_release(pgp_data);
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fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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fprintf(stderr, "Initialize gpgme\n");
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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){
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fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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/* Set GPGME home directory for the OpenPGP engine only */
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/* Set GPGME home directory for the OpenPGP engine only */
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rc = gpgme_get_engine_info (&engine_info);
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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while(engine_info != NULL){
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if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
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gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
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engine_info->file_name, homedir);
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engine_info->file_name, tempdir);
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engine_info = engine_info->next;
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if(engine_info == NULL){
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fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
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fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
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/* Create new GPGME "context" */
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rc = gpgme_new(&(mc->ctx));
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_new: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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if (not import_key(pubkey) or not import_key(seckey)){
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* Decrypt OpenPGP data.
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* Returns -1 on error
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static ssize_t pgp_packet_decrypt (const mandos_context *mc,
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const char *cryptotext,
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gpgme_data_t dh_crypto, dh_plain;
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size_t plaintext_capacity = 0;
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ssize_t plaintext_length = 0;
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fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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/* Create new GPGME data buffer from memory cryptotext */
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/* Create new GPGME "context" */
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rc = gpgme_new(&ctx);
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_new: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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plaintext_length = -1;
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/* Decrypt data from the cryptotext data buffer to the plaintext
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rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
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rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
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if (rc != GPG_ERR_NO_ERROR){
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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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result = gpgme_op_decrypt_result(mc->ctx);
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if (result == NULL){
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fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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char *connect_to = NULL;
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char tempdir[] = "/tmp/mandosXXXXXX";
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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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const char *seckey = PATHDIR "/" SECKEY;
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const char *pubkey = PATHDIR "/" PUBKEY;
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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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bool gnutls_initalized = false;
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bool gpgme_initalized = false;
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struct argp_option options[] = {
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if (mc.simple_poll != NULL)
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avahi_simple_poll_free(mc.simple_poll);
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free(pubkeyfilename);
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free(seckeyfilename);
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if (gnutls_initalized){
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gnutls_certificate_free_credentials(mc.cred);
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gnutls_global_deinit ();
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gnutls_dh_params_deinit(mc.dh_params);
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if(gpgme_initalized){
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gpgme_release(mc.ctx);
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/* Removes the temp directory used by GPGME */
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if(tempdir[0] != '\0'){
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struct dirent *direntry;
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d = opendir(tempdir);
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direntry = readdir(d);
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if(direntry == NULL){
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if (direntry->d_type == DT_REG){
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char *fullname = NULL;
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ret = asprintf(&fullname, "%s/%s", tempdir,
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ret = unlink(fullname);
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fprintf(stderr, "unlink(\"%s\"): %s",
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fullname, strerror(errno));
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ret = rmdir(tempdir);
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return exitcode;