/mandos/release : revision 63

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

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#include <stdio.h>

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#include <assert.h>

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#include <stdlib.h>

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#include <time.h>

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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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SIOCSIFFLAGS */

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#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,

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ferror() */

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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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srand() */

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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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#include <sys/ioctl.h> /* ioctl */

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#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,

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IFF_UP */

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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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uid_t, gid_t */

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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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connect() */

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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 */

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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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setgid() */

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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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/* Avahi */

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/* All Avahi types, constants and functions

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Avahi*, avahi_*,

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AVAHI_* */

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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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/* 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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/* GnuTLS */

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#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions

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gnutls_*

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init_gnutls_session(),

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GNUTLS_* */

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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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#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 <argp.h> /* struct argp_option,

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struct argp_state, struct argp,

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argp_parse() */

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/* GPGME */

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#include <errno.h> /* perror() */

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#include <gpgme.h>

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#include <gpgme.h> /* All GPGME types, constants and functions

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gpgme_*

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GPGME_PROTOCOL_OpenPGP,

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GPG_ERR_NO_* */

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#define BUFFER_SIZE 256

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bool debug = false;

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const char *keydir = "/conf/conf.d/mandos";

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const char *argp_program_version = "mandosclient 0.9";

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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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const char mandos_protocol_version[] = "1";

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/* Used for passing in values through all the callback functions */

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/* Used for passing in values through the Avahi callback functions */

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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const char *priority;

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} mandos_context;

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/*

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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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*/

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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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} else {

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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: %d\n",

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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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*plaintext = NULL;

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while(true){

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plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,

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plaintext_capacity = adjustbuffer(plaintext,

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(size_t)plaintext_length,

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plaintext_capacity);

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if (plaintext_capacity == 0){

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perror("adjustbuffer");

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if(debug){

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fprintf(stderr, "Initializing GnuTLS\n");

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}

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if ((ret = gnutls_global_init ())

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!= GNUTLS_E_SUCCESS) {

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ret = gnutls_global_init();

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if (ret != GNUTLS_E_SUCCESS) {

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fprintf (stderr, "GnuTLS global_init: %s\n",

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safer_gnutls_strerror(ret));

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return -1;

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}

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/* OpenPGP credentials */

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if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))

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!= GNUTLS_E_SUCCESS) {

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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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safer_gnutls_strerror(ret));

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gnutls_global_deinit ();

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return -1;

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}

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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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return -1;

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goto globalfail;

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}

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/* GnuTLS server initialization */

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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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return -1;

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goto globalfail;

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}

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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 (stderr, "Error in GnuTLS prime generation: %s\n",

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safer_gnutls_strerror(ret));

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return -1;

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goto globalfail;

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}

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gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

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return 0;

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globalfail:

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gnutls_certificate_free_credentials(mc->cred);

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gnutls_global_deinit();

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return -1;

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}

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static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){

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static int init_gnutls_session(mandos_context *mc,

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gnutls_session_t *session){

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int ret;

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/* GnuTLS session creation */

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ret = gnutls_init(session, GNUTLS_SERVER);

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fprintf(stderr, "Syntax error at: %s\n", err);

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fprintf(stderr, "GnuTLS error: %s\n",

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safer_gnutls_strerror(ret));

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gnutls_deinit (*session);

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return -1;

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}

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}

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if (ret != GNUTLS_E_SUCCESS) {

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fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

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safer_gnutls_strerror(ret));

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gnutls_deinit (*session);

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return -1;

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}

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AvahiIfIndex if_index,

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mandos_context *mc){

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int ret, tcp_sd;

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struct sockaddr_in6 to;

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union { struct sockaddr in; struct sockaddr_in6 in6; } to;

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char *buffer = NULL;

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char *decrypted_buffer;

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size_t buffer_length = 0;

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int retval = 0;

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char interface[IF_NAMESIZE];

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gnutls_session_t session;

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gnutls_dh_params_t dh_params;

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ret = init_gnutls_session (mc, &session);

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if (ret != 0){

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}

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if(debug){

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fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",

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ip, port);

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fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16

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"\n", ip, port);

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}

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tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

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}

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memset(&to,0,sizeof(to)); /* Spurious warning */

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to.sin6_family = AF_INET6;

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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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ret = inet_pton(AF_INET6, ip, &to.sin6_addr);

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ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);

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if (ret < 0 ){

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perror("inet_pton");

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return -1;

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fprintf(stderr, "Bad address: %s\n", ip);

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return -1;

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}

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to.sin6_port = htons(port); /* Spurious warning */

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to.in6.sin6_port = htons(port); /* Spurious warning */

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to.sin6_scope_id = (uint32_t)if_index;

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to.in6.sin6_scope_id = (uint32_t)if_index;

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if(debug){

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fprintf(stderr, "Connection to: %s, port %d\n", ip, port);

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fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,

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port);

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char addrstr[INET6_ADDRSTRLEN] = "";

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if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,

498

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

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sizeof(addrstr)) == NULL){

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perror("inet_ntop");

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501

} else {

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505

}

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}

466

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ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));

508

ret = connect(tcp_sd, &to.in, sizeof(to));

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509

if (ret < 0){

469

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perror("connect");

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return -1;

499

540

}

500

541

501

542

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

502

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ret = gnutls_handshake (session);

543

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do{

545

ret = gnutls_handshake (session);

546

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

504

547

505

548

if (ret != GNUTLS_E_SUCCESS){

506

549

if(debug){

519

562

}

520

563

521

564

while(true){

522

buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);

565

buffer_capacity = adjustbuffer(&buffer, buffer_length,

566

buffer_capacity);

523

567

if (buffer_capacity == 0){

524

568

perror("adjustbuffer");

525

569

retval = -1;

537

581

case GNUTLS_E_AGAIN:

538

582

break;

539

583

case GNUTLS_E_REHANDSHAKE:

540

ret = gnutls_handshake (session);

584

do{

585

ret = gnutls_handshake (session);

586

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

541

587

if (ret < 0){

542

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fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

543

589

gnutls_perror (ret);

596

642

free(buffer);

597

643

close(tcp_sd);

598

644

gnutls_deinit (session);

599

gnutls_certificate_free_credentials (mc->cred);

600

gnutls_global_deinit ();

601

645

return retval;

602

646

}

603

647

634

678

char ip[AVAHI_ADDRESS_STR_MAX];

635

679

avahi_address_snprint(ip, sizeof(ip), address);

636

680

if(debug){

637

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"

638

" port %d\n", name, host_name, ip, interface, port);

681

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

682

PRIu16 ") on port %d\n", name, host_name, ip,

683

interface, port);

639

684

}

640

685

int ret = start_mandos_communication(ip, port, interface, mc);

641

686

if (ret == 0){

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779

const char *seckeyfile = "seckey.txt";

735

780

mandos_context mc = { .simple_poll = NULL, .server = NULL,

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781

.dh_bits = 1024, .priority = "SECURE256"};

782

bool gnutls_initalized = false;

737

783

738

784

{

739

785

struct argp_option options[] = {

741

787

.doc = "Debug mode", .group = 3 },

742

788

{ .name = "connect", .key = 'c',

743

789

.arg = "IP",

744

.doc = "Connect directly to a sepcified mandos server", .group = 1 },

790

.doc = "Connect directly to a sepcified mandos server",

791

.group = 1 },

745

792

{ .name = "interface", .key = 'i',

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793

.arg = "INTERFACE",

747

.doc = "Interface that Avahi will conntect through", .group = 1 },

794

.doc = "Interface that Avahi will conntect through",

795

.group = 1 },

748

796

{ .name = "keydir", .key = 'd',

749

797

.arg = "KEYDIR",

750

.doc = "Directory where the openpgp keyring is", .group = 1 },

798

.doc = "Directory where the openpgp keyring is",

799

.group = 1 },

751

800

{ .name = "seckey", .key = 's',

752

801

.arg = "SECKEY",

753

.doc = "Secret openpgp key for gnutls authentication", .group = 1 },

802

.doc = "Secret openpgp key for gnutls authentication",

803

.group = 1 },

754

804

{ .name = "pubkey", .key = 'p',

755

805

.arg = "PUBKEY",

756

.doc = "Public openpgp key for gnutls authentication", .group = 2 },

806

.doc = "Public openpgp key for gnutls authentication",

807

.group = 2 },

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808

{ .name = "dh-bits", .key = 129,

758

809

.arg = "BITS",

759

.doc = "dh-bits to use in gnutls communication", .group = 2 },

810

.doc = "dh-bits to use in gnutls communication",

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.group = 2 },

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812

{ .name = "priority", .key = 130,

761

813

.arg = "PRIORITY",

762

814

.doc = "GNUTLS priority", .group = 1 },

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816

};

765

817

766

818

767

error_t parse_opt (int key, char *arg, struct argp_state *state) {

768

/* Get the INPUT argument from `argp_parse', which we know is a

769

pointer to our plugin list pointer. */

819

error_t parse_opt (int key, char *arg,

820

struct argp_state *state) {

821

/* Get the INPUT argument from `argp_parse', which we know is

822

a pointer to our plugin list pointer. */

770

823

switch (key) {

771

824

case 128:

772

825

debug = true;

810

863

811

864

struct argp argp = { .options = options, .parser = parse_opt,

812

865

.args_doc = "",

813

.doc = "Mandos client -- Get and decrypt passwords from mandos server" };

814

argp_parse (&argp, argc, argv, 0, 0, NULL);

866

.doc = "Mandos client -- Get and decrypt"

867

" passwords from mandos server" };

868

ret = argp_parse (&argp, argc, argv, 0, 0, NULL);

869

if (ret == ARGP_ERR_UNKNOWN){

870

fprintf(stderr, "Unkown error while parsing arguments\n");

871

exitcode = EXIT_FAILURE;

872

goto end;

873

}

815

874

}

816

875

817

876

pubkeyfile = combinepath(keydir, pubkeyfile);

831

890

if (ret == -1){

832

891

fprintf(stderr, "init_gnutls_global\n");

833

892

goto end;

893

} else {

894

gnutls_initalized = true;

834

895

}

835

896

836

897

uid = getuid();

985

1046

avahi_simple_poll_free(mc.simple_poll);

986

1047

free(pubkeyfile);

987

1048

free(seckeyfile);

1049

1050

if (gnutls_initalized){

1051

gnutls_certificate_free_credentials(mc.cred);

1052

gnutls_global_deinit ();

1053

}

988

1054

989

1055

return exitcode;

990

1056

}